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 <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 };
436 
437 struct tog_blame {
438 	FILE *f;
439 	off_t filesize;
440 	struct tog_blame_line *lines;
441 	int nlines;
442 	off_t *line_offsets;
443 	pthread_t thread;
444 	struct tog_blame_thread_args thread_args;
445 	struct tog_blame_cb_args cb_args;
446 	const char *path;
447 	int *pack_fds;
448 };
449 
450 struct tog_blame_view_state {
451 	int first_displayed_line;
452 	int last_displayed_line;
453 	int selected_line;
454 	int last_diffed_line;
455 	int blame_complete;
456 	int eof;
457 	int done;
458 	struct got_object_id_queue blamed_commits;
459 	struct got_object_qid *blamed_commit;
460 	char *path;
461 	struct got_repository *repo;
462 	struct got_object_id *commit_id;
463 	struct got_object_id *id_to_log;
464 	struct tog_blame blame;
465 	int matched_line;
466 	struct tog_colors colors;
467 };
468 
469 struct tog_parent_tree {
470 	TAILQ_ENTRY(tog_parent_tree) entry;
471 	struct got_tree_object *tree;
472 	struct got_tree_entry *first_displayed_entry;
473 	struct got_tree_entry *selected_entry;
474 	int selected;
475 };
476 
477 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
478 
479 struct tog_tree_view_state {
480 	char *tree_label;
481 	struct got_object_id *commit_id;/* commit which this tree belongs to */
482 	struct got_tree_object *root;	/* the commit's root tree entry */
483 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
484 	struct got_tree_entry *first_displayed_entry;
485 	struct got_tree_entry *last_displayed_entry;
486 	struct got_tree_entry *selected_entry;
487 	int ndisplayed, selected, show_ids;
488 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
489 	char *head_ref_name;
490 	struct got_repository *repo;
491 	struct got_tree_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 struct tog_reflist_entry {
496 	TAILQ_ENTRY(tog_reflist_entry) entry;
497 	struct got_reference *ref;
498 	int idx;
499 };
500 
501 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
502 
503 struct tog_ref_view_state {
504 	struct tog_reflist_head refs;
505 	struct tog_reflist_entry *first_displayed_entry;
506 	struct tog_reflist_entry *last_displayed_entry;
507 	struct tog_reflist_entry *selected_entry;
508 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
509 	struct got_repository *repo;
510 	struct tog_reflist_entry *matched_entry;
511 	struct tog_colors colors;
512 };
513 
514 struct tog_help_view_state {
515 	FILE			*f;
516 	off_t			*line_offsets;
517 	size_t			 nlines;
518 	int			 lineno;
519 	int			 first_displayed_line;
520 	int			 last_displayed_line;
521 	int			 eof;
522 	int			 matched_line;
523 	int			 selected_line;
524 	int			 all;
525 	enum tog_keymap_type	 type;
526 };
527 
528 #define GENERATE_HELP \
529 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
530 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
531 	KEY_("k C-p Up", "Move cursor or page up one line"), \
532 	KEY_("j C-n Down", "Move cursor or page down one line"), \
533 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
534 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
535 	KEY_("C-u u", "Scroll the view up one half page"), \
536 	KEY_("C-d d", "Scroll the view down one half page"), \
537 	KEY_("g", "Go to line N (default: first line)"), \
538 	KEY_("Home =", "Go to the first line"), \
539 	KEY_("G", "Go to line N (default: last line)"), \
540 	KEY_("End *", "Go to the last line"), \
541 	KEY_("l Right", "Scroll the view right"), \
542 	KEY_("h Left", "Scroll the view left"), \
543 	KEY_("$", "Scroll view to the rightmost position"), \
544 	KEY_("0", "Scroll view to the leftmost position"), \
545 	KEY_("-", "Decrease size of the focussed split"), \
546 	KEY_("+", "Increase size of the focussed split"), \
547 	KEY_("Tab", "Switch focus between views"), \
548 	KEY_("F", "Toggle fullscreen mode"), \
549 	KEY_("/", "Open prompt to enter search term"), \
550 	KEY_("n", "Find next line/token matching the current search term"), \
551 	KEY_("N", "Find previous line/token matching the current search term"),\
552 	KEY_("q", "Quit the focussed view; Quit help screen"), \
553 	KEY_("Q", "Quit tog"), \
554 	\
555 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
556 	KEY_("< ,", "Move cursor up one commit"), \
557 	KEY_("> .", "Move cursor down one commit"), \
558 	KEY_("Enter", "Open diff view of the selected commit"), \
559 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
560 	KEY_("R", "Open ref view of all repository references"), \
561 	KEY_("T", "Display tree view of the repository from the selected" \
562 	    " commit"), \
563 	KEY_("@", "Toggle between displaying author and committer name"), \
564 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
565 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
566 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
567 	\
568 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
569 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
570 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
571 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
572 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
573 	    " data"), \
574 	KEY_("(", "Go to the previous file in the diff"), \
575 	KEY_(")", "Go to the next file in the diff"), \
576 	KEY_("{", "Go to the previous hunk in the diff"), \
577 	KEY_("}", "Go to the next hunk in the diff"), \
578 	KEY_("[", "Decrease the number of context lines"), \
579 	KEY_("]", "Increase the number of context lines"), \
580 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
581 	\
582 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
583 	KEY_("Enter", "Display diff view of the selected line's commit"), \
584 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
585 	KEY_("L", "Open log view for the currently selected annotated line"), \
586 	KEY_("C", "Reload view with the previously blamed commit"), \
587 	KEY_("c", "Reload view with the version of the file found in the" \
588 	    " selected line's commit"), \
589 	KEY_("p", "Reload view with the version of the file found in the" \
590 	    " selected line's parent commit"), \
591 	\
592 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
593 	KEY_("Enter", "Enter selected directory or open blame view of the" \
594 	    " selected file"), \
595 	KEY_("L", "Open log view for the selected entry"), \
596 	KEY_("R", "Open ref view of all repository references"), \
597 	KEY_("i", "Show object IDs for all tree entries"), \
598 	KEY_("Backspace", "Return to the parent directory"), \
599 	\
600 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
601 	KEY_("Enter", "Display log view of the selected reference"), \
602 	KEY_("T", "Display tree view of the selected reference"), \
603 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
604 	KEY_("m", "Toggle display of last modified date for each reference"), \
605 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
606 	KEY_("C-l", "Reload view with all repository references")
607 
608 struct tog_key_map {
609 	const char		*keys;
610 	const char		*info;
611 	enum tog_keymap_type	 type;
612 };
613 
614 /*
615  * We implement two types of views: parent views and child views.
616  *
617  * The 'Tab' key switches focus between a parent view and its child view.
618  * Child views are shown side-by-side to their parent view, provided
619  * there is enough screen estate.
620  *
621  * When a new view is opened from within a parent view, this new view
622  * becomes a child view of the parent view, replacing any existing child.
623  *
624  * When a new view is opened from within a child view, this new view
625  * becomes a parent view which will obscure the views below until the
626  * user quits the new parent view by typing 'q'.
627  *
628  * This list of views contains parent views only.
629  * Child views are only pointed to by their parent view.
630  */
631 TAILQ_HEAD(tog_view_list_head, tog_view);
632 
633 struct tog_view {
634 	TAILQ_ENTRY(tog_view) entry;
635 	WINDOW *window;
636 	PANEL *panel;
637 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
638 	int resized_y, resized_x; /* begin_y/x based on user resizing */
639 	int maxx, x; /* max column and current start column */
640 	int lines, cols; /* copies of LINES and COLS */
641 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
642 	int gline, hiline; /* navigate to and highlight this nG line */
643 	int ch, count; /* current keymap and count prefix */
644 	int resized; /* set when in a resize event */
645 	int focussed; /* Only set on one parent or child view at a time. */
646 	int dying;
647 	struct tog_view *parent;
648 	struct tog_view *child;
649 
650 	/*
651 	 * This flag is initially set on parent views when a new child view
652 	 * is created. It gets toggled when the 'Tab' key switches focus
653 	 * between parent and child.
654 	 * The flag indicates whether focus should be passed on to our child
655 	 * view if this parent view gets picked for focus after another parent
656 	 * view was closed. This prevents child views from losing focus in such
657 	 * situations.
658 	 */
659 	int focus_child;
660 
661 	enum tog_view_mode mode;
662 	/* type-specific state */
663 	enum tog_view_type type;
664 	union {
665 		struct tog_diff_view_state diff;
666 		struct tog_log_view_state log;
667 		struct tog_blame_view_state blame;
668 		struct tog_tree_view_state tree;
669 		struct tog_ref_view_state ref;
670 		struct tog_help_view_state help;
671 	} state;
672 
673 	const struct got_error *(*show)(struct tog_view *);
674 	const struct got_error *(*input)(struct tog_view **,
675 	    struct tog_view *, int);
676 	const struct got_error *(*reset)(struct tog_view *);
677 	const struct got_error *(*resize)(struct tog_view *, int);
678 	const struct got_error *(*close)(struct tog_view *);
679 
680 	const struct got_error *(*search_start)(struct tog_view *);
681 	const struct got_error *(*search_next)(struct tog_view *);
682 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
683 	    int **, int **, int **, int **);
684 	int search_started;
685 	int searching;
686 #define TOG_SEARCH_FORWARD	1
687 #define TOG_SEARCH_BACKWARD	2
688 	int search_next_done;
689 #define TOG_SEARCH_HAVE_MORE	1
690 #define TOG_SEARCH_NO_MORE	2
691 #define TOG_SEARCH_HAVE_NONE	3
692 	regex_t regex;
693 	regmatch_t regmatch;
694 	const char *action;
695 };
696 
697 static const struct got_error *open_diff_view(struct tog_view *,
698     struct got_object_id *, struct got_object_id *,
699     const char *, const char *, int, int, int, struct tog_view *,
700     struct got_repository *);
701 static const struct got_error *show_diff_view(struct tog_view *);
702 static const struct got_error *input_diff_view(struct tog_view **,
703     struct tog_view *, int);
704 static const struct got_error *reset_diff_view(struct tog_view *);
705 static const struct got_error* close_diff_view(struct tog_view *);
706 static const struct got_error *search_start_diff_view(struct tog_view *);
707 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
708     size_t *, int **, int **, int **, int **);
709 static const struct got_error *search_next_view_match(struct tog_view *);
710 
711 static const struct got_error *open_log_view(struct tog_view *,
712     struct got_object_id *, struct got_repository *,
713     const char *, const char *, int);
714 static const struct got_error * show_log_view(struct tog_view *);
715 static const struct got_error *input_log_view(struct tog_view **,
716     struct tog_view *, int);
717 static const struct got_error *resize_log_view(struct tog_view *, int);
718 static const struct got_error *close_log_view(struct tog_view *);
719 static const struct got_error *search_start_log_view(struct tog_view *);
720 static const struct got_error *search_next_log_view(struct tog_view *);
721 
722 static const struct got_error *open_blame_view(struct tog_view *, char *,
723     struct got_object_id *, struct got_repository *);
724 static const struct got_error *show_blame_view(struct tog_view *);
725 static const struct got_error *input_blame_view(struct tog_view **,
726     struct tog_view *, int);
727 static const struct got_error *reset_blame_view(struct tog_view *);
728 static const struct got_error *close_blame_view(struct tog_view *);
729 static const struct got_error *search_start_blame_view(struct tog_view *);
730 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
731     size_t *, int **, int **, int **, int **);
732 
733 static const struct got_error *open_tree_view(struct tog_view *,
734     struct got_object_id *, const char *, struct got_repository *);
735 static const struct got_error *show_tree_view(struct tog_view *);
736 static const struct got_error *input_tree_view(struct tog_view **,
737     struct tog_view *, int);
738 static const struct got_error *close_tree_view(struct tog_view *);
739 static const struct got_error *search_start_tree_view(struct tog_view *);
740 static const struct got_error *search_next_tree_view(struct tog_view *);
741 
742 static const struct got_error *open_ref_view(struct tog_view *,
743     struct got_repository *);
744 static const struct got_error *show_ref_view(struct tog_view *);
745 static const struct got_error *input_ref_view(struct tog_view **,
746     struct tog_view *, int);
747 static const struct got_error *close_ref_view(struct tog_view *);
748 static const struct got_error *search_start_ref_view(struct tog_view *);
749 static const struct got_error *search_next_ref_view(struct tog_view *);
750 
751 static const struct got_error *open_help_view(struct tog_view *,
752     struct tog_view *);
753 static const struct got_error *show_help_view(struct tog_view *);
754 static const struct got_error *input_help_view(struct tog_view **,
755     struct tog_view *, int);
756 static const struct got_error *reset_help_view(struct tog_view *);
757 static const struct got_error* close_help_view(struct tog_view *);
758 static const struct got_error *search_start_help_view(struct tog_view *);
759 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
760     size_t *, int **, int **, int **, int **);
761 
762 static volatile sig_atomic_t tog_sigwinch_received;
763 static volatile sig_atomic_t tog_sigpipe_received;
764 static volatile sig_atomic_t tog_sigcont_received;
765 static volatile sig_atomic_t tog_sigint_received;
766 static volatile sig_atomic_t tog_sigterm_received;
767 
768 static void
769 tog_sigwinch(int signo)
770 {
771 	tog_sigwinch_received = 1;
772 }
773 
774 static void
775 tog_sigpipe(int signo)
776 {
777 	tog_sigpipe_received = 1;
778 }
779 
780 static void
781 tog_sigcont(int signo)
782 {
783 	tog_sigcont_received = 1;
784 }
785 
786 static void
787 tog_sigint(int signo)
788 {
789 	tog_sigint_received = 1;
790 }
791 
792 static void
793 tog_sigterm(int signo)
794 {
795 	tog_sigterm_received = 1;
796 }
797 
798 static int
799 tog_fatal_signal_received(void)
800 {
801 	return (tog_sigpipe_received ||
802 	    tog_sigint_received || tog_sigterm_received);
803 }
804 
805 static const struct got_error *
806 view_close(struct tog_view *view)
807 {
808 	const struct got_error *err = NULL, *child_err = NULL;
809 
810 	if (view->child) {
811 		child_err = view_close(view->child);
812 		view->child = NULL;
813 	}
814 	if (view->close)
815 		err = view->close(view);
816 	if (view->panel)
817 		del_panel(view->panel);
818 	if (view->window)
819 		delwin(view->window);
820 	free(view);
821 	return err ? err : child_err;
822 }
823 
824 static struct tog_view *
825 view_open(int nlines, int ncols, int begin_y, int begin_x,
826     enum tog_view_type type)
827 {
828 	struct tog_view *view = calloc(1, sizeof(*view));
829 
830 	if (view == NULL)
831 		return NULL;
832 
833 	view->type = type;
834 	view->lines = LINES;
835 	view->cols = COLS;
836 	view->nlines = nlines ? nlines : LINES - begin_y;
837 	view->ncols = ncols ? ncols : COLS - begin_x;
838 	view->begin_y = begin_y;
839 	view->begin_x = begin_x;
840 	view->window = newwin(nlines, ncols, begin_y, begin_x);
841 	if (view->window == NULL) {
842 		view_close(view);
843 		return NULL;
844 	}
845 	view->panel = new_panel(view->window);
846 	if (view->panel == NULL ||
847 	    set_panel_userptr(view->panel, view) != OK) {
848 		view_close(view);
849 		return NULL;
850 	}
851 
852 	keypad(view->window, TRUE);
853 	return view;
854 }
855 
856 static int
857 view_split_begin_x(int begin_x)
858 {
859 	if (begin_x > 0 || COLS < 120)
860 		return 0;
861 	return (COLS - MAX(COLS / 2, 80));
862 }
863 
864 /* XXX Stub till we decide what to do. */
865 static int
866 view_split_begin_y(int lines)
867 {
868 	return lines * HSPLIT_SCALE;
869 }
870 
871 static const struct got_error *view_resize(struct tog_view *);
872 
873 static const struct got_error *
874 view_splitscreen(struct tog_view *view)
875 {
876 	const struct got_error *err = NULL;
877 
878 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
879 		if (view->resized_y && view->resized_y < view->lines)
880 			view->begin_y = view->resized_y;
881 		else
882 			view->begin_y = view_split_begin_y(view->nlines);
883 		view->begin_x = 0;
884 	} else if (!view->resized) {
885 		if (view->resized_x && view->resized_x < view->cols - 1 &&
886 		    view->cols > 119)
887 			view->begin_x = view->resized_x;
888 		else
889 			view->begin_x = view_split_begin_x(0);
890 		view->begin_y = 0;
891 	}
892 	view->nlines = LINES - view->begin_y;
893 	view->ncols = COLS - view->begin_x;
894 	view->lines = LINES;
895 	view->cols = COLS;
896 	err = view_resize(view);
897 	if (err)
898 		return err;
899 
900 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
901 		view->parent->nlines = view->begin_y;
902 
903 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
904 		return got_error_from_errno("mvwin");
905 
906 	return NULL;
907 }
908 
909 static const struct got_error *
910 view_fullscreen(struct tog_view *view)
911 {
912 	const struct got_error *err = NULL;
913 
914 	view->begin_x = 0;
915 	view->begin_y = view->resized ? view->begin_y : 0;
916 	view->nlines = view->resized ? view->nlines : LINES;
917 	view->ncols = COLS;
918 	view->lines = LINES;
919 	view->cols = COLS;
920 	err = view_resize(view);
921 	if (err)
922 		return err;
923 
924 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
925 		return got_error_from_errno("mvwin");
926 
927 	return NULL;
928 }
929 
930 static int
931 view_is_parent_view(struct tog_view *view)
932 {
933 	return view->parent == NULL;
934 }
935 
936 static int
937 view_is_splitscreen(struct tog_view *view)
938 {
939 	return view->begin_x > 0 || view->begin_y > 0;
940 }
941 
942 static int
943 view_is_fullscreen(struct tog_view *view)
944 {
945 	return view->nlines == LINES && view->ncols == COLS;
946 }
947 
948 static int
949 view_is_hsplit_top(struct tog_view *view)
950 {
951 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
952 	    view_is_splitscreen(view->child);
953 }
954 
955 static void
956 view_border(struct tog_view *view)
957 {
958 	PANEL *panel;
959 	const struct tog_view *view_above;
960 
961 	if (view->parent)
962 		return view_border(view->parent);
963 
964 	panel = panel_above(view->panel);
965 	if (panel == NULL)
966 		return;
967 
968 	view_above = panel_userptr(panel);
969 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
970 		mvwhline(view->window, view_above->begin_y - 1,
971 		    view->begin_x, got_locale_is_utf8() ?
972 		    ACS_HLINE : '-', view->ncols);
973 	else
974 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
975 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
976 }
977 
978 static const struct got_error *view_init_hsplit(struct tog_view *, int);
979 static const struct got_error *request_log_commits(struct tog_view *);
980 static const struct got_error *offset_selection_down(struct tog_view *);
981 static void offset_selection_up(struct tog_view *);
982 static void view_get_split(struct tog_view *, int *, int *);
983 
984 static const struct got_error *
985 view_resize(struct tog_view *view)
986 {
987 	const struct got_error	*err = NULL;
988 	int			 dif, nlines, ncols;
989 
990 	dif = LINES - view->lines;  /* line difference */
991 
992 	if (view->lines > LINES)
993 		nlines = view->nlines - (view->lines - LINES);
994 	else
995 		nlines = view->nlines + (LINES - view->lines);
996 	if (view->cols > COLS)
997 		ncols = view->ncols - (view->cols - COLS);
998 	else
999 		ncols = view->ncols + (COLS - view->cols);
1000 
1001 	if (view->child) {
1002 		int hs = view->child->begin_y;
1003 
1004 		if (!view_is_fullscreen(view))
1005 			view->child->begin_x = view_split_begin_x(view->begin_x);
1006 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1007 		    view->child->begin_x == 0) {
1008 			ncols = COLS;
1009 
1010 			view_fullscreen(view->child);
1011 			if (view->child->focussed)
1012 				show_panel(view->child->panel);
1013 			else
1014 				show_panel(view->panel);
1015 		} else {
1016 			ncols = view->child->begin_x;
1017 
1018 			view_splitscreen(view->child);
1019 			show_panel(view->child->panel);
1020 		}
1021 		/*
1022 		 * XXX This is ugly and needs to be moved into the above
1023 		 * logic but "works" for now and my attempts at moving it
1024 		 * break either 'tab' or 'F' key maps in horizontal splits.
1025 		 */
1026 		if (hs) {
1027 			err = view_splitscreen(view->child);
1028 			if (err)
1029 				return err;
1030 			if (dif < 0) { /* top split decreased */
1031 				err = offset_selection_down(view);
1032 				if (err)
1033 					return err;
1034 			}
1035 			view_border(view);
1036 			update_panels();
1037 			doupdate();
1038 			show_panel(view->child->panel);
1039 			nlines = view->nlines;
1040 		}
1041 	} else if (view->parent == NULL)
1042 		ncols = COLS;
1043 
1044 	if (view->resize && dif > 0) {
1045 		err = view->resize(view, dif);
1046 		if (err)
1047 			return err;
1048 	}
1049 
1050 	if (wresize(view->window, nlines, ncols) == ERR)
1051 		return got_error_from_errno("wresize");
1052 	if (replace_panel(view->panel, view->window) == ERR)
1053 		return got_error_from_errno("replace_panel");
1054 	wclear(view->window);
1055 
1056 	view->nlines = nlines;
1057 	view->ncols = ncols;
1058 	view->lines = LINES;
1059 	view->cols = COLS;
1060 
1061 	return NULL;
1062 }
1063 
1064 static const struct got_error *
1065 resize_log_view(struct tog_view *view, int increase)
1066 {
1067 	struct tog_log_view_state	*s = &view->state.log;
1068 	const struct got_error		*err = NULL;
1069 	int				 n = 0;
1070 
1071 	if (s->selected_entry)
1072 		n = s->selected_entry->idx + view->lines - s->selected;
1073 
1074 	/*
1075 	 * Request commits to account for the increased
1076 	 * height so we have enough to populate the view.
1077 	 */
1078 	if (s->commits->ncommits < n) {
1079 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1080 		err = request_log_commits(view);
1081 	}
1082 
1083 	return err;
1084 }
1085 
1086 static void
1087 view_adjust_offset(struct tog_view *view, int n)
1088 {
1089 	if (n == 0)
1090 		return;
1091 
1092 	if (view->parent && view->parent->offset) {
1093 		if (view->parent->offset + n >= 0)
1094 			view->parent->offset += n;
1095 		else
1096 			view->parent->offset = 0;
1097 	} else if (view->offset) {
1098 		if (view->offset - n >= 0)
1099 			view->offset -= n;
1100 		else
1101 			view->offset = 0;
1102 	}
1103 }
1104 
1105 static const struct got_error *
1106 view_resize_split(struct tog_view *view, int resize)
1107 {
1108 	const struct got_error	*err = NULL;
1109 	struct tog_view		*v = NULL;
1110 
1111 	if (view->parent)
1112 		v = view->parent;
1113 	else
1114 		v = view;
1115 
1116 	if (!v->child || !view_is_splitscreen(v->child))
1117 		return NULL;
1118 
1119 	v->resized = v->child->resized = resize;  /* lock for resize event */
1120 
1121 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1122 		if (v->child->resized_y)
1123 			v->child->begin_y = v->child->resized_y;
1124 		if (view->parent)
1125 			v->child->begin_y -= resize;
1126 		else
1127 			v->child->begin_y += resize;
1128 		if (v->child->begin_y < 3) {
1129 			view->count = 0;
1130 			v->child->begin_y = 3;
1131 		} else if (v->child->begin_y > LINES - 1) {
1132 			view->count = 0;
1133 			v->child->begin_y = LINES - 1;
1134 		}
1135 		v->ncols = COLS;
1136 		v->child->ncols = COLS;
1137 		view_adjust_offset(view, resize);
1138 		err = view_init_hsplit(v, v->child->begin_y);
1139 		if (err)
1140 			return err;
1141 		v->child->resized_y = v->child->begin_y;
1142 	} else {
1143 		if (v->child->resized_x)
1144 			v->child->begin_x = v->child->resized_x;
1145 		if (view->parent)
1146 			v->child->begin_x -= resize;
1147 		else
1148 			v->child->begin_x += resize;
1149 		if (v->child->begin_x < 11) {
1150 			view->count = 0;
1151 			v->child->begin_x = 11;
1152 		} else if (v->child->begin_x > COLS - 1) {
1153 			view->count = 0;
1154 			v->child->begin_x = COLS - 1;
1155 		}
1156 		v->child->resized_x = v->child->begin_x;
1157 	}
1158 
1159 	v->child->mode = v->mode;
1160 	v->child->nlines = v->lines - v->child->begin_y;
1161 	v->child->ncols = v->cols - v->child->begin_x;
1162 	v->focus_child = 1;
1163 
1164 	err = view_fullscreen(v);
1165 	if (err)
1166 		return err;
1167 	err = view_splitscreen(v->child);
1168 	if (err)
1169 		return err;
1170 
1171 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1172 		err = offset_selection_down(v->child);
1173 		if (err)
1174 			return err;
1175 	}
1176 
1177 	if (v->resize)
1178 		err = v->resize(v, 0);
1179 	else if (v->child->resize)
1180 		err = v->child->resize(v->child, 0);
1181 
1182 	v->resized = v->child->resized = 0;
1183 
1184 	return err;
1185 }
1186 
1187 static void
1188 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1189 {
1190 	struct tog_view *v = src->child ? src->child : src;
1191 
1192 	dst->resized_x = v->resized_x;
1193 	dst->resized_y = v->resized_y;
1194 }
1195 
1196 static const struct got_error *
1197 view_close_child(struct tog_view *view)
1198 {
1199 	const struct got_error *err = NULL;
1200 
1201 	if (view->child == NULL)
1202 		return NULL;
1203 
1204 	err = view_close(view->child);
1205 	view->child = NULL;
1206 	return err;
1207 }
1208 
1209 static const struct got_error *
1210 view_set_child(struct tog_view *view, struct tog_view *child)
1211 {
1212 	const struct got_error *err = NULL;
1213 
1214 	view->child = child;
1215 	child->parent = view;
1216 
1217 	err = view_resize(view);
1218 	if (err)
1219 		return err;
1220 
1221 	if (view->child->resized_x || view->child->resized_y)
1222 		err = view_resize_split(view, 0);
1223 
1224 	return err;
1225 }
1226 
1227 static const struct got_error *view_dispatch_request(struct tog_view **,
1228     struct tog_view *, enum tog_view_type, int, int);
1229 
1230 static const struct got_error *
1231 view_request_new(struct tog_view **requested, struct tog_view *view,
1232     enum tog_view_type request)
1233 {
1234 	struct tog_view		*new_view = NULL;
1235 	const struct got_error	*err;
1236 	int			 y = 0, x = 0;
1237 
1238 	*requested = NULL;
1239 
1240 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1241 		view_get_split(view, &y, &x);
1242 
1243 	err = view_dispatch_request(&new_view, view, request, y, x);
1244 	if (err)
1245 		return err;
1246 
1247 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1248 	    request != TOG_VIEW_HELP) {
1249 		err = view_init_hsplit(view, y);
1250 		if (err)
1251 			return err;
1252 	}
1253 
1254 	view->focussed = 0;
1255 	new_view->focussed = 1;
1256 	new_view->mode = view->mode;
1257 	new_view->nlines = request == TOG_VIEW_HELP ?
1258 	    view->lines : view->lines - y;
1259 
1260 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1261 		view_transfer_size(new_view, view);
1262 		err = view_close_child(view);
1263 		if (err)
1264 			return err;
1265 		err = view_set_child(view, new_view);
1266 		if (err)
1267 			return err;
1268 		view->focus_child = 1;
1269 	} else
1270 		*requested = new_view;
1271 
1272 	return NULL;
1273 }
1274 
1275 static void
1276 tog_resizeterm(void)
1277 {
1278 	int cols, lines;
1279 	struct winsize size;
1280 
1281 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1282 		cols = 80;     /* Default */
1283 		lines = 24;
1284 	} else {
1285 		cols = size.ws_col;
1286 		lines = size.ws_row;
1287 	}
1288 	resize_term(lines, cols);
1289 }
1290 
1291 static const struct got_error *
1292 view_search_start(struct tog_view *view)
1293 {
1294 	const struct got_error *err = NULL;
1295 	struct tog_view *v = view;
1296 	char pattern[1024];
1297 	int ret;
1298 
1299 	if (view->search_started) {
1300 		regfree(&view->regex);
1301 		view->searching = 0;
1302 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1303 	}
1304 	view->search_started = 0;
1305 
1306 	if (view->nlines < 1)
1307 		return NULL;
1308 
1309 	if (view_is_hsplit_top(view))
1310 		v = view->child;
1311 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1312 		v = view->parent;
1313 
1314 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1315 	wclrtoeol(v->window);
1316 
1317 	nodelay(v->window, FALSE);  /* block for search term input */
1318 	nocbreak();
1319 	echo();
1320 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1321 	wrefresh(v->window);
1322 	cbreak();
1323 	noecho();
1324 	nodelay(v->window, TRUE);
1325 	if (ret == ERR)
1326 		return NULL;
1327 
1328 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1329 		err = view->search_start(view);
1330 		if (err) {
1331 			regfree(&view->regex);
1332 			return err;
1333 		}
1334 		view->search_started = 1;
1335 		view->searching = TOG_SEARCH_FORWARD;
1336 		view->search_next_done = 0;
1337 		view->search_next(view);
1338 	}
1339 
1340 	return NULL;
1341 }
1342 
1343 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1344 static const struct got_error *
1345 switch_split(struct tog_view *view)
1346 {
1347 	const struct got_error	*err = NULL;
1348 	struct tog_view		*v = NULL;
1349 
1350 	if (view->parent)
1351 		v = view->parent;
1352 	else
1353 		v = view;
1354 
1355 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1356 		v->mode = TOG_VIEW_SPLIT_VERT;
1357 	else
1358 		v->mode = TOG_VIEW_SPLIT_HRZN;
1359 
1360 	if (!v->child)
1361 		return NULL;
1362 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1363 		v->mode = TOG_VIEW_SPLIT_NONE;
1364 
1365 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1366 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1367 		v->child->begin_y = v->child->resized_y;
1368 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1369 		v->child->begin_x = v->child->resized_x;
1370 
1371 
1372 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1373 		v->ncols = COLS;
1374 		v->child->ncols = COLS;
1375 		v->child->nscrolled = LINES - v->child->nlines;
1376 
1377 		err = view_init_hsplit(v, v->child->begin_y);
1378 		if (err)
1379 			return err;
1380 	}
1381 	v->child->mode = v->mode;
1382 	v->child->nlines = v->lines - v->child->begin_y;
1383 	v->focus_child = 1;
1384 
1385 	err = view_fullscreen(v);
1386 	if (err)
1387 		return err;
1388 	err = view_splitscreen(v->child);
1389 	if (err)
1390 		return err;
1391 
1392 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1393 		v->mode = TOG_VIEW_SPLIT_VERT;
1394 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1395 		err = offset_selection_down(v);
1396 		if (err)
1397 			return err;
1398 		err = offset_selection_down(v->child);
1399 		if (err)
1400 			return err;
1401 	} else {
1402 		offset_selection_up(v);
1403 		offset_selection_up(v->child);
1404 	}
1405 	if (v->resize)
1406 		err = v->resize(v, 0);
1407 	else if (v->child->resize)
1408 		err = v->child->resize(v->child, 0);
1409 
1410 	return err;
1411 }
1412 
1413 /*
1414  * Compute view->count from numeric input. Assign total to view->count and
1415  * return first non-numeric key entered.
1416  */
1417 static int
1418 get_compound_key(struct tog_view *view, int c)
1419 {
1420 	struct tog_view	*v = view;
1421 	int		 x, n = 0;
1422 
1423 	if (view_is_hsplit_top(view))
1424 		v = view->child;
1425 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1426 		v = view->parent;
1427 
1428 	view->count = 0;
1429 	cbreak();  /* block for input */
1430 	nodelay(view->window, FALSE);
1431 	wmove(v->window, v->nlines - 1, 0);
1432 	wclrtoeol(v->window);
1433 	waddch(v->window, ':');
1434 
1435 	do {
1436 		x = getcurx(v->window);
1437 		if (x != ERR && x < view->ncols) {
1438 			waddch(v->window, c);
1439 			wrefresh(v->window);
1440 		}
1441 
1442 		/*
1443 		 * Don't overflow. Max valid request should be the greatest
1444 		 * between the longest and total lines; cap at 10 million.
1445 		 */
1446 		if (n >= 9999999)
1447 			n = 9999999;
1448 		else
1449 			n = n * 10 + (c - '0');
1450 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1451 
1452 	if (c == 'G' || c == 'g') {	/* nG key map */
1453 		view->gline = view->hiline = n;
1454 		n = 0;
1455 		c = 0;
1456 	}
1457 
1458 	/* Massage excessive or inapplicable values at the input handler. */
1459 	view->count = n;
1460 
1461 	return c;
1462 }
1463 
1464 static void
1465 action_report(struct tog_view *view)
1466 {
1467 	struct tog_view *v = view;
1468 
1469 	if (view_is_hsplit_top(view))
1470 		v = view->child;
1471 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1472 		v = view->parent;
1473 
1474 	wmove(v->window, v->nlines - 1, 0);
1475 	wclrtoeol(v->window);
1476 	wprintw(v->window, ":%s", view->action);
1477 	wrefresh(v->window);
1478 
1479 	/*
1480 	 * Clear action status report. Only clear in blame view
1481 	 * once annotating is complete, otherwise it's too fast.
1482 	 */
1483 	if (view->type == TOG_VIEW_BLAME) {
1484 		if (view->state.blame.blame_complete)
1485 			view->action = NULL;
1486 	} else
1487 		view->action = NULL;
1488 }
1489 
1490 static const struct got_error *
1491 view_input(struct tog_view **new, int *done, struct tog_view *view,
1492     struct tog_view_list_head *views)
1493 {
1494 	const struct got_error *err = NULL;
1495 	struct tog_view *v;
1496 	int ch, errcode;
1497 
1498 	*new = NULL;
1499 
1500 	if (view->action)
1501 		action_report(view);
1502 
1503 	/* Clear "no matches" indicator. */
1504 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1505 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1506 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1507 		view->count = 0;
1508 	}
1509 
1510 	if (view->searching && !view->search_next_done) {
1511 		errcode = pthread_mutex_unlock(&tog_mutex);
1512 		if (errcode)
1513 			return got_error_set_errno(errcode,
1514 			    "pthread_mutex_unlock");
1515 		sched_yield();
1516 		errcode = pthread_mutex_lock(&tog_mutex);
1517 		if (errcode)
1518 			return got_error_set_errno(errcode,
1519 			    "pthread_mutex_lock");
1520 		view->search_next(view);
1521 		return NULL;
1522 	}
1523 
1524 	/* Allow threads to make progress while we are waiting for input. */
1525 	errcode = pthread_mutex_unlock(&tog_mutex);
1526 	if (errcode)
1527 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1528 	/* If we have an unfinished count, let C-g or backspace abort. */
1529 	if (view->count && --view->count) {
1530 		cbreak();
1531 		nodelay(view->window, TRUE);
1532 		ch = wgetch(view->window);
1533 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1534 			view->count = 0;
1535 		else
1536 			ch = view->ch;
1537 	} else {
1538 		ch = wgetch(view->window);
1539 		if (ch >= '1' && ch  <= '9')
1540 			view->ch = ch = get_compound_key(view, ch);
1541 	}
1542 	if (view->hiline && ch != ERR && ch != 0)
1543 		view->hiline = 0;  /* key pressed, clear line highlight */
1544 	nodelay(view->window, TRUE);
1545 	errcode = pthread_mutex_lock(&tog_mutex);
1546 	if (errcode)
1547 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1548 
1549 	if (tog_sigwinch_received || tog_sigcont_received) {
1550 		tog_resizeterm();
1551 		tog_sigwinch_received = 0;
1552 		tog_sigcont_received = 0;
1553 		TAILQ_FOREACH(v, views, entry) {
1554 			err = view_resize(v);
1555 			if (err)
1556 				return err;
1557 			err = v->input(new, v, KEY_RESIZE);
1558 			if (err)
1559 				return err;
1560 			if (v->child) {
1561 				err = view_resize(v->child);
1562 				if (err)
1563 					return err;
1564 				err = v->child->input(new, v->child,
1565 				    KEY_RESIZE);
1566 				if (err)
1567 					return err;
1568 				if (v->child->resized_x || v->child->resized_y) {
1569 					err = view_resize_split(v, 0);
1570 					if (err)
1571 						return err;
1572 				}
1573 			}
1574 		}
1575 	}
1576 
1577 	switch (ch) {
1578 	case '?':
1579 	case 'H':
1580 	case KEY_F(1):
1581 		if (view->type == TOG_VIEW_HELP)
1582 			err = view->reset(view);
1583 		else
1584 			err = view_request_new(new, view, TOG_VIEW_HELP);
1585 		break;
1586 	case '\t':
1587 		view->count = 0;
1588 		if (view->child) {
1589 			view->focussed = 0;
1590 			view->child->focussed = 1;
1591 			view->focus_child = 1;
1592 		} else if (view->parent) {
1593 			view->focussed = 0;
1594 			view->parent->focussed = 1;
1595 			view->parent->focus_child = 0;
1596 			if (!view_is_splitscreen(view)) {
1597 				if (view->parent->resize) {
1598 					err = view->parent->resize(view->parent,
1599 					    0);
1600 					if (err)
1601 						return err;
1602 				}
1603 				offset_selection_up(view->parent);
1604 				err = view_fullscreen(view->parent);
1605 				if (err)
1606 					return err;
1607 			}
1608 		}
1609 		break;
1610 	case 'q':
1611 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1612 			if (view->parent->resize) {
1613 				/* might need more commits to fill fullscreen */
1614 				err = view->parent->resize(view->parent, 0);
1615 				if (err)
1616 					break;
1617 			}
1618 			offset_selection_up(view->parent);
1619 		}
1620 		err = view->input(new, view, ch);
1621 		view->dying = 1;
1622 		break;
1623 	case 'Q':
1624 		*done = 1;
1625 		break;
1626 	case 'F':
1627 		view->count = 0;
1628 		if (view_is_parent_view(view)) {
1629 			if (view->child == NULL)
1630 				break;
1631 			if (view_is_splitscreen(view->child)) {
1632 				view->focussed = 0;
1633 				view->child->focussed = 1;
1634 				err = view_fullscreen(view->child);
1635 			} else {
1636 				err = view_splitscreen(view->child);
1637 				if (!err)
1638 					err = view_resize_split(view, 0);
1639 			}
1640 			if (err)
1641 				break;
1642 			err = view->child->input(new, view->child,
1643 			    KEY_RESIZE);
1644 		} else {
1645 			if (view_is_splitscreen(view)) {
1646 				view->parent->focussed = 0;
1647 				view->focussed = 1;
1648 				err = view_fullscreen(view);
1649 			} else {
1650 				err = view_splitscreen(view);
1651 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1652 					err = view_resize(view->parent);
1653 				if (!err)
1654 					err = view_resize_split(view, 0);
1655 			}
1656 			if (err)
1657 				break;
1658 			err = view->input(new, view, KEY_RESIZE);
1659 		}
1660 		if (err)
1661 			break;
1662 		if (view->resize) {
1663 			err = view->resize(view, 0);
1664 			if (err)
1665 				break;
1666 		}
1667 		if (view->parent)
1668 			err = offset_selection_down(view->parent);
1669 		if (!err)
1670 			err = offset_selection_down(view);
1671 		break;
1672 	case 'S':
1673 		view->count = 0;
1674 		err = switch_split(view);
1675 		break;
1676 	case '-':
1677 		err = view_resize_split(view, -1);
1678 		break;
1679 	case '+':
1680 		err = view_resize_split(view, 1);
1681 		break;
1682 	case KEY_RESIZE:
1683 		break;
1684 	case '/':
1685 		view->count = 0;
1686 		if (view->search_start)
1687 			view_search_start(view);
1688 		else
1689 			err = view->input(new, view, ch);
1690 		break;
1691 	case 'N':
1692 	case 'n':
1693 		if (view->search_started && view->search_next) {
1694 			view->searching = (ch == 'n' ?
1695 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1696 			view->search_next_done = 0;
1697 			view->search_next(view);
1698 		} else
1699 			err = view->input(new, view, ch);
1700 		break;
1701 	case 'A':
1702 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1703 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1704 			view->action = "Patience diff algorithm";
1705 		} else {
1706 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1707 			view->action = "Myers diff algorithm";
1708 		}
1709 		TAILQ_FOREACH(v, views, entry) {
1710 			if (v->reset) {
1711 				err = v->reset(v);
1712 				if (err)
1713 					return err;
1714 			}
1715 			if (v->child && v->child->reset) {
1716 				err = v->child->reset(v->child);
1717 				if (err)
1718 					return err;
1719 			}
1720 		}
1721 		break;
1722 	default:
1723 		err = view->input(new, view, ch);
1724 		break;
1725 	}
1726 
1727 	return err;
1728 }
1729 
1730 static int
1731 view_needs_focus_indication(struct tog_view *view)
1732 {
1733 	if (view_is_parent_view(view)) {
1734 		if (view->child == NULL || view->child->focussed)
1735 			return 0;
1736 		if (!view_is_splitscreen(view->child))
1737 			return 0;
1738 	} else if (!view_is_splitscreen(view))
1739 		return 0;
1740 
1741 	return view->focussed;
1742 }
1743 
1744 static const struct got_error *
1745 view_loop(struct tog_view *view)
1746 {
1747 	const struct got_error *err = NULL;
1748 	struct tog_view_list_head views;
1749 	struct tog_view *new_view;
1750 	char *mode;
1751 	int fast_refresh = 10;
1752 	int done = 0, errcode;
1753 
1754 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1755 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1756 		view->mode = TOG_VIEW_SPLIT_VERT;
1757 	else
1758 		view->mode = TOG_VIEW_SPLIT_HRZN;
1759 
1760 	errcode = pthread_mutex_lock(&tog_mutex);
1761 	if (errcode)
1762 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1763 
1764 	TAILQ_INIT(&views);
1765 	TAILQ_INSERT_HEAD(&views, view, entry);
1766 
1767 	view->focussed = 1;
1768 	err = view->show(view);
1769 	if (err)
1770 		return err;
1771 	update_panels();
1772 	doupdate();
1773 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1774 	    !tog_fatal_signal_received()) {
1775 		/* Refresh fast during initialization, then become slower. */
1776 		if (fast_refresh && --fast_refresh == 0)
1777 			halfdelay(10); /* switch to once per second */
1778 
1779 		err = view_input(&new_view, &done, view, &views);
1780 		if (err)
1781 			break;
1782 
1783 		if (view->dying && view == TAILQ_FIRST(&views) &&
1784 		    TAILQ_NEXT(view, entry) == NULL)
1785 			done = 1;
1786 		if (done) {
1787 			struct tog_view *v;
1788 
1789 			/*
1790 			 * When we quit, scroll the screen up a single line
1791 			 * so we don't lose any information.
1792 			 */
1793 			TAILQ_FOREACH(v, &views, entry) {
1794 				wmove(v->window, 0, 0);
1795 				wdeleteln(v->window);
1796 				wnoutrefresh(v->window);
1797 				if (v->child && !view_is_fullscreen(v)) {
1798 					wmove(v->child->window, 0, 0);
1799 					wdeleteln(v->child->window);
1800 					wnoutrefresh(v->child->window);
1801 				}
1802 			}
1803 			doupdate();
1804 		}
1805 
1806 		if (view->dying) {
1807 			struct tog_view *v, *prev = NULL;
1808 
1809 			if (view_is_parent_view(view))
1810 				prev = TAILQ_PREV(view, tog_view_list_head,
1811 				    entry);
1812 			else if (view->parent)
1813 				prev = view->parent;
1814 
1815 			if (view->parent) {
1816 				view->parent->child = NULL;
1817 				view->parent->focus_child = 0;
1818 				/* Restore fullscreen line height. */
1819 				view->parent->nlines = view->parent->lines;
1820 				err = view_resize(view->parent);
1821 				if (err)
1822 					break;
1823 				/* Make resized splits persist. */
1824 				view_transfer_size(view->parent, view);
1825 			} else
1826 				TAILQ_REMOVE(&views, view, entry);
1827 
1828 			err = view_close(view);
1829 			if (err)
1830 				goto done;
1831 
1832 			view = NULL;
1833 			TAILQ_FOREACH(v, &views, entry) {
1834 				if (v->focussed)
1835 					break;
1836 			}
1837 			if (view == NULL && new_view == NULL) {
1838 				/* No view has focus. Try to pick one. */
1839 				if (prev)
1840 					view = prev;
1841 				else if (!TAILQ_EMPTY(&views)) {
1842 					view = TAILQ_LAST(&views,
1843 					    tog_view_list_head);
1844 				}
1845 				if (view) {
1846 					if (view->focus_child) {
1847 						view->child->focussed = 1;
1848 						view = view->child;
1849 					} else
1850 						view->focussed = 1;
1851 				}
1852 			}
1853 		}
1854 		if (new_view) {
1855 			struct tog_view *v, *t;
1856 			/* Only allow one parent view per type. */
1857 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1858 				if (v->type != new_view->type)
1859 					continue;
1860 				TAILQ_REMOVE(&views, v, entry);
1861 				err = view_close(v);
1862 				if (err)
1863 					goto done;
1864 				break;
1865 			}
1866 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1867 			view = new_view;
1868 		}
1869 		if (view && !done) {
1870 			if (view_is_parent_view(view)) {
1871 				if (view->child && view->child->focussed)
1872 					view = view->child;
1873 			} else {
1874 				if (view->parent && view->parent->focussed)
1875 					view = view->parent;
1876 			}
1877 			show_panel(view->panel);
1878 			if (view->child && view_is_splitscreen(view->child))
1879 				show_panel(view->child->panel);
1880 			if (view->parent && view_is_splitscreen(view)) {
1881 				err = view->parent->show(view->parent);
1882 				if (err)
1883 					goto done;
1884 			}
1885 			err = view->show(view);
1886 			if (err)
1887 				goto done;
1888 			if (view->child) {
1889 				err = view->child->show(view->child);
1890 				if (err)
1891 					goto done;
1892 			}
1893 			update_panels();
1894 			doupdate();
1895 		}
1896 	}
1897 done:
1898 	while (!TAILQ_EMPTY(&views)) {
1899 		const struct got_error *close_err;
1900 		view = TAILQ_FIRST(&views);
1901 		TAILQ_REMOVE(&views, view, entry);
1902 		close_err = view_close(view);
1903 		if (close_err && err == NULL)
1904 			err = close_err;
1905 	}
1906 
1907 	errcode = pthread_mutex_unlock(&tog_mutex);
1908 	if (errcode && err == NULL)
1909 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1910 
1911 	return err;
1912 }
1913 
1914 __dead static void
1915 usage_log(void)
1916 {
1917 	endwin();
1918 	fprintf(stderr,
1919 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1920 	    getprogname());
1921 	exit(1);
1922 }
1923 
1924 /* Create newly allocated wide-character string equivalent to a byte string. */
1925 static const struct got_error *
1926 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1927 {
1928 	char *vis = NULL;
1929 	const struct got_error *err = NULL;
1930 
1931 	*ws = NULL;
1932 	*wlen = mbstowcs(NULL, s, 0);
1933 	if (*wlen == (size_t)-1) {
1934 		int vislen;
1935 		if (errno != EILSEQ)
1936 			return got_error_from_errno("mbstowcs");
1937 
1938 		/* byte string invalid in current encoding; try to "fix" it */
1939 		err = got_mbsavis(&vis, &vislen, s);
1940 		if (err)
1941 			return err;
1942 		*wlen = mbstowcs(NULL, vis, 0);
1943 		if (*wlen == (size_t)-1) {
1944 			err = got_error_from_errno("mbstowcs"); /* give up */
1945 			goto done;
1946 		}
1947 	}
1948 
1949 	*ws = calloc(*wlen + 1, sizeof(**ws));
1950 	if (*ws == NULL) {
1951 		err = got_error_from_errno("calloc");
1952 		goto done;
1953 	}
1954 
1955 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1956 		err = got_error_from_errno("mbstowcs");
1957 done:
1958 	free(vis);
1959 	if (err) {
1960 		free(*ws);
1961 		*ws = NULL;
1962 		*wlen = 0;
1963 	}
1964 	return err;
1965 }
1966 
1967 static const struct got_error *
1968 expand_tab(char **ptr, const char *src)
1969 {
1970 	char	*dst;
1971 	size_t	 len, n, idx = 0, sz = 0;
1972 
1973 	*ptr = NULL;
1974 	n = len = strlen(src);
1975 	dst = malloc(n + 1);
1976 	if (dst == NULL)
1977 		return got_error_from_errno("malloc");
1978 
1979 	while (idx < len && src[idx]) {
1980 		const char c = src[idx];
1981 
1982 		if (c == '\t') {
1983 			size_t nb = TABSIZE - sz % TABSIZE;
1984 			char *p;
1985 
1986 			p = realloc(dst, n + nb);
1987 			if (p == NULL) {
1988 				free(dst);
1989 				return got_error_from_errno("realloc");
1990 
1991 			}
1992 			dst = p;
1993 			n += nb;
1994 			memset(dst + sz, ' ', nb);
1995 			sz += nb;
1996 		} else
1997 			dst[sz++] = src[idx];
1998 		++idx;
1999 	}
2000 
2001 	dst[sz] = '\0';
2002 	*ptr = dst;
2003 	return NULL;
2004 }
2005 
2006 /*
2007  * Advance at most n columns from wline starting at offset off.
2008  * Return the index to the first character after the span operation.
2009  * Return the combined column width of all spanned wide character in
2010  * *rcol.
2011  */
2012 static int
2013 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2014 {
2015 	int width, i, cols = 0;
2016 
2017 	if (n == 0) {
2018 		*rcol = cols;
2019 		return off;
2020 	}
2021 
2022 	for (i = off; wline[i] != L'\0'; ++i) {
2023 		if (wline[i] == L'\t')
2024 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2025 		else
2026 			width = wcwidth(wline[i]);
2027 
2028 		if (width == -1) {
2029 			width = 1;
2030 			wline[i] = L'.';
2031 		}
2032 
2033 		if (cols + width > n)
2034 			break;
2035 		cols += width;
2036 	}
2037 
2038 	*rcol = cols;
2039 	return i;
2040 }
2041 
2042 /*
2043  * Format a line for display, ensuring that it won't overflow a width limit.
2044  * With scrolling, the width returned refers to the scrolled version of the
2045  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2046  */
2047 static const struct got_error *
2048 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2049     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2050 {
2051 	const struct got_error *err = NULL;
2052 	int cols;
2053 	wchar_t *wline = NULL;
2054 	char *exstr = NULL;
2055 	size_t wlen;
2056 	int i, scrollx;
2057 
2058 	*wlinep = NULL;
2059 	*widthp = 0;
2060 
2061 	if (expand) {
2062 		err = expand_tab(&exstr, line);
2063 		if (err)
2064 			return err;
2065 	}
2066 
2067 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2068 	free(exstr);
2069 	if (err)
2070 		return err;
2071 
2072 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2073 
2074 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2075 		wline[wlen - 1] = L'\0';
2076 		wlen--;
2077 	}
2078 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2079 		wline[wlen - 1] = L'\0';
2080 		wlen--;
2081 	}
2082 
2083 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2084 	wline[i] = L'\0';
2085 
2086 	if (widthp)
2087 		*widthp = cols;
2088 	if (scrollxp)
2089 		*scrollxp = scrollx;
2090 	if (err)
2091 		free(wline);
2092 	else
2093 		*wlinep = wline;
2094 	return err;
2095 }
2096 
2097 static const struct got_error*
2098 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2099     struct got_object_id *id, struct got_repository *repo)
2100 {
2101 	static const struct got_error *err = NULL;
2102 	struct got_reflist_entry *re;
2103 	char *s;
2104 	const char *name;
2105 
2106 	*refs_str = NULL;
2107 
2108 	TAILQ_FOREACH(re, refs, entry) {
2109 		struct got_tag_object *tag = NULL;
2110 		struct got_object_id *ref_id;
2111 		int cmp;
2112 
2113 		name = got_ref_get_name(re->ref);
2114 		if (strcmp(name, GOT_REF_HEAD) == 0)
2115 			continue;
2116 		if (strncmp(name, "refs/", 5) == 0)
2117 			name += 5;
2118 		if (strncmp(name, "got/", 4) == 0 &&
2119 		    strncmp(name, "got/backup/", 11) != 0)
2120 			continue;
2121 		if (strncmp(name, "heads/", 6) == 0)
2122 			name += 6;
2123 		if (strncmp(name, "remotes/", 8) == 0) {
2124 			name += 8;
2125 			s = strstr(name, "/" GOT_REF_HEAD);
2126 			if (s != NULL && s[strlen(s)] == '\0')
2127 				continue;
2128 		}
2129 		err = got_ref_resolve(&ref_id, repo, re->ref);
2130 		if (err)
2131 			break;
2132 		if (strncmp(name, "tags/", 5) == 0) {
2133 			err = got_object_open_as_tag(&tag, repo, ref_id);
2134 			if (err) {
2135 				if (err->code != GOT_ERR_OBJ_TYPE) {
2136 					free(ref_id);
2137 					break;
2138 				}
2139 				/* Ref points at something other than a tag. */
2140 				err = NULL;
2141 				tag = NULL;
2142 			}
2143 		}
2144 		cmp = got_object_id_cmp(tag ?
2145 		    got_object_tag_get_object_id(tag) : ref_id, id);
2146 		free(ref_id);
2147 		if (tag)
2148 			got_object_tag_close(tag);
2149 		if (cmp != 0)
2150 			continue;
2151 		s = *refs_str;
2152 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2153 		    s ? ", " : "", name) == -1) {
2154 			err = got_error_from_errno("asprintf");
2155 			free(s);
2156 			*refs_str = NULL;
2157 			break;
2158 		}
2159 		free(s);
2160 	}
2161 
2162 	return err;
2163 }
2164 
2165 static const struct got_error *
2166 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2167     int col_tab_align)
2168 {
2169 	char *smallerthan;
2170 
2171 	smallerthan = strchr(author, '<');
2172 	if (smallerthan && smallerthan[1] != '\0')
2173 		author = smallerthan + 1;
2174 	author[strcspn(author, "@>")] = '\0';
2175 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2176 	    col_tab_align, 0);
2177 }
2178 
2179 static const struct got_error *
2180 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2181     struct got_object_id *id, const size_t date_display_cols,
2182     int author_display_cols)
2183 {
2184 	struct tog_log_view_state *s = &view->state.log;
2185 	const struct got_error *err = NULL;
2186 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2187 	char *logmsg0 = NULL, *logmsg = NULL;
2188 	char *author = NULL;
2189 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2190 	int author_width, logmsg_width;
2191 	char *newline, *line = NULL;
2192 	int col, limit, scrollx;
2193 	const int avail = view->ncols;
2194 	struct tm tm;
2195 	time_t committer_time;
2196 	struct tog_color *tc;
2197 
2198 	committer_time = got_object_commit_get_committer_time(commit);
2199 	if (gmtime_r(&committer_time, &tm) == NULL)
2200 		return got_error_from_errno("gmtime_r");
2201 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2202 		return got_error(GOT_ERR_NO_SPACE);
2203 
2204 	if (avail <= date_display_cols)
2205 		limit = MIN(sizeof(datebuf) - 1, avail);
2206 	else
2207 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2208 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2209 	if (tc)
2210 		wattr_on(view->window,
2211 		    COLOR_PAIR(tc->colorpair), NULL);
2212 	waddnstr(view->window, datebuf, limit);
2213 	if (tc)
2214 		wattr_off(view->window,
2215 		    COLOR_PAIR(tc->colorpair), NULL);
2216 	col = limit;
2217 	if (col > avail)
2218 		goto done;
2219 
2220 	if (avail >= 120) {
2221 		char *id_str;
2222 		err = got_object_id_str(&id_str, id);
2223 		if (err)
2224 			goto done;
2225 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2226 		if (tc)
2227 			wattr_on(view->window,
2228 			    COLOR_PAIR(tc->colorpair), NULL);
2229 		wprintw(view->window, "%.8s ", id_str);
2230 		if (tc)
2231 			wattr_off(view->window,
2232 			    COLOR_PAIR(tc->colorpair), NULL);
2233 		free(id_str);
2234 		col += 9;
2235 		if (col > avail)
2236 			goto done;
2237 	}
2238 
2239 	if (s->use_committer)
2240 		author = strdup(got_object_commit_get_committer(commit));
2241 	else
2242 		author = strdup(got_object_commit_get_author(commit));
2243 	if (author == NULL) {
2244 		err = got_error_from_errno("strdup");
2245 		goto done;
2246 	}
2247 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2248 	if (err)
2249 		goto done;
2250 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2251 	if (tc)
2252 		wattr_on(view->window,
2253 		    COLOR_PAIR(tc->colorpair), NULL);
2254 	waddwstr(view->window, wauthor);
2255 	col += author_width;
2256 	while (col < avail && author_width < author_display_cols + 2) {
2257 		waddch(view->window, ' ');
2258 		col++;
2259 		author_width++;
2260 	}
2261 	if (tc)
2262 		wattr_off(view->window,
2263 		    COLOR_PAIR(tc->colorpair), NULL);
2264 	if (col > avail)
2265 		goto done;
2266 
2267 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2268 	if (err)
2269 		goto done;
2270 	logmsg = logmsg0;
2271 	while (*logmsg == '\n')
2272 		logmsg++;
2273 	newline = strchr(logmsg, '\n');
2274 	if (newline)
2275 		*newline = '\0';
2276 	limit = avail - col;
2277 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2278 		limit--;	/* for the border */
2279 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2280 	    limit, col, 1);
2281 	if (err)
2282 		goto done;
2283 	waddwstr(view->window, &wlogmsg[scrollx]);
2284 	col += MAX(logmsg_width, 0);
2285 	while (col < avail) {
2286 		waddch(view->window, ' ');
2287 		col++;
2288 	}
2289 done:
2290 	free(logmsg0);
2291 	free(wlogmsg);
2292 	free(author);
2293 	free(wauthor);
2294 	free(line);
2295 	return err;
2296 }
2297 
2298 static struct commit_queue_entry *
2299 alloc_commit_queue_entry(struct got_commit_object *commit,
2300     struct got_object_id *id)
2301 {
2302 	struct commit_queue_entry *entry;
2303 	struct got_object_id *dup;
2304 
2305 	entry = calloc(1, sizeof(*entry));
2306 	if (entry == NULL)
2307 		return NULL;
2308 
2309 	dup = got_object_id_dup(id);
2310 	if (dup == NULL) {
2311 		free(entry);
2312 		return NULL;
2313 	}
2314 
2315 	entry->id = dup;
2316 	entry->commit = commit;
2317 	return entry;
2318 }
2319 
2320 static void
2321 pop_commit(struct commit_queue *commits)
2322 {
2323 	struct commit_queue_entry *entry;
2324 
2325 	entry = TAILQ_FIRST(&commits->head);
2326 	TAILQ_REMOVE(&commits->head, entry, entry);
2327 	got_object_commit_close(entry->commit);
2328 	commits->ncommits--;
2329 	free(entry->id);
2330 	free(entry);
2331 }
2332 
2333 static void
2334 free_commits(struct commit_queue *commits)
2335 {
2336 	while (!TAILQ_EMPTY(&commits->head))
2337 		pop_commit(commits);
2338 }
2339 
2340 static const struct got_error *
2341 match_commit(int *have_match, struct got_object_id *id,
2342     struct got_commit_object *commit, regex_t *regex)
2343 {
2344 	const struct got_error *err = NULL;
2345 	regmatch_t regmatch;
2346 	char *id_str = NULL, *logmsg = NULL;
2347 
2348 	*have_match = 0;
2349 
2350 	err = got_object_id_str(&id_str, id);
2351 	if (err)
2352 		return err;
2353 
2354 	err = got_object_commit_get_logmsg(&logmsg, commit);
2355 	if (err)
2356 		goto done;
2357 
2358 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2359 	    &regmatch, 0) == 0 ||
2360 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2361 	    &regmatch, 0) == 0 ||
2362 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2363 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2364 		*have_match = 1;
2365 done:
2366 	free(id_str);
2367 	free(logmsg);
2368 	return err;
2369 }
2370 
2371 static const struct got_error *
2372 queue_commits(struct tog_log_thread_args *a)
2373 {
2374 	const struct got_error *err = NULL;
2375 
2376 	/*
2377 	 * We keep all commits open throughout the lifetime of the log
2378 	 * view in order to avoid having to re-fetch commits from disk
2379 	 * while updating the display.
2380 	 */
2381 	do {
2382 		struct got_object_id id;
2383 		struct got_commit_object *commit;
2384 		struct commit_queue_entry *entry;
2385 		int limit_match = 0;
2386 		int errcode;
2387 
2388 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2389 		    NULL, NULL);
2390 		if (err)
2391 			break;
2392 
2393 		err = got_object_open_as_commit(&commit, a->repo, &id);
2394 		if (err)
2395 			break;
2396 		entry = alloc_commit_queue_entry(commit, &id);
2397 		if (entry == NULL) {
2398 			err = got_error_from_errno("alloc_commit_queue_entry");
2399 			break;
2400 		}
2401 
2402 		errcode = pthread_mutex_lock(&tog_mutex);
2403 		if (errcode) {
2404 			err = got_error_set_errno(errcode,
2405 			    "pthread_mutex_lock");
2406 			break;
2407 		}
2408 
2409 		entry->idx = a->real_commits->ncommits;
2410 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2411 		a->real_commits->ncommits++;
2412 
2413 		if (*a->limiting) {
2414 			err = match_commit(&limit_match, &id, commit,
2415 			    a->limit_regex);
2416 			if (err)
2417 				break;
2418 
2419 			if (limit_match) {
2420 				struct commit_queue_entry *matched;
2421 
2422 				matched = alloc_commit_queue_entry(
2423 				    entry->commit, entry->id);
2424 				if (matched == NULL) {
2425 					err = got_error_from_errno(
2426 					    "alloc_commit_queue_entry");
2427 					break;
2428 				}
2429 				matched->commit = entry->commit;
2430 				got_object_commit_retain(entry->commit);
2431 
2432 				matched->idx = a->limit_commits->ncommits;
2433 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2434 				    matched, entry);
2435 				a->limit_commits->ncommits++;
2436 			}
2437 
2438 			/*
2439 			 * This is how we signal log_thread() that we
2440 			 * have found a match, and that it should be
2441 			 * counted as a new entry for the view.
2442 			 */
2443 			a->limit_match = limit_match;
2444 		}
2445 
2446 		if (*a->searching == TOG_SEARCH_FORWARD &&
2447 		    !*a->search_next_done) {
2448 			int have_match;
2449 			err = match_commit(&have_match, &id, commit, a->regex);
2450 			if (err)
2451 				break;
2452 
2453 			if (*a->limiting) {
2454 				if (limit_match && have_match)
2455 					*a->search_next_done =
2456 					    TOG_SEARCH_HAVE_MORE;
2457 			} else if (have_match)
2458 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2459 		}
2460 
2461 		errcode = pthread_mutex_unlock(&tog_mutex);
2462 		if (errcode && err == NULL)
2463 			err = got_error_set_errno(errcode,
2464 			    "pthread_mutex_unlock");
2465 		if (err)
2466 			break;
2467 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2468 
2469 	return err;
2470 }
2471 
2472 static void
2473 select_commit(struct tog_log_view_state *s)
2474 {
2475 	struct commit_queue_entry *entry;
2476 	int ncommits = 0;
2477 
2478 	entry = s->first_displayed_entry;
2479 	while (entry) {
2480 		if (ncommits == s->selected) {
2481 			s->selected_entry = entry;
2482 			break;
2483 		}
2484 		entry = TAILQ_NEXT(entry, entry);
2485 		ncommits++;
2486 	}
2487 }
2488 
2489 static const struct got_error *
2490 draw_commits(struct tog_view *view)
2491 {
2492 	const struct got_error *err = NULL;
2493 	struct tog_log_view_state *s = &view->state.log;
2494 	struct commit_queue_entry *entry = s->selected_entry;
2495 	int limit = view->nlines;
2496 	int width;
2497 	int ncommits, author_cols = 4;
2498 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2499 	char *refs_str = NULL;
2500 	wchar_t *wline;
2501 	struct tog_color *tc;
2502 	static const size_t date_display_cols = 12;
2503 
2504 	if (view_is_hsplit_top(view))
2505 		--limit;  /* account for border */
2506 
2507 	if (s->selected_entry &&
2508 	    !(view->searching && view->search_next_done == 0)) {
2509 		struct got_reflist_head *refs;
2510 		err = got_object_id_str(&id_str, s->selected_entry->id);
2511 		if (err)
2512 			return err;
2513 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2514 		    s->selected_entry->id);
2515 		if (refs) {
2516 			err = build_refs_str(&refs_str, refs,
2517 			    s->selected_entry->id, s->repo);
2518 			if (err)
2519 				goto done;
2520 		}
2521 	}
2522 
2523 	if (s->thread_args.commits_needed == 0)
2524 		halfdelay(10); /* disable fast refresh */
2525 
2526 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2527 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2528 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2529 		    (view->searching && !view->search_next_done) ?
2530 		    "searching..." : "loading...") == -1) {
2531 			err = got_error_from_errno("asprintf");
2532 			goto done;
2533 		}
2534 	} else {
2535 		const char *search_str = NULL;
2536 		const char *limit_str = NULL;
2537 
2538 		if (view->searching) {
2539 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2540 				search_str = "no more matches";
2541 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2542 				search_str = "no matches found";
2543 			else if (!view->search_next_done)
2544 				search_str = "searching...";
2545 		}
2546 
2547 		if (s->limit_view && s->commits->ncommits == 0)
2548 			limit_str = "no matches found";
2549 
2550 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2551 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2552 		    search_str ? search_str : (refs_str ? refs_str : ""),
2553 		    limit_str ? limit_str : "") == -1) {
2554 			err = got_error_from_errno("asprintf");
2555 			goto done;
2556 		}
2557 	}
2558 
2559 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2560 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2561 		    "........................................",
2562 		    s->in_repo_path, ncommits_str) == -1) {
2563 			err = got_error_from_errno("asprintf");
2564 			header = NULL;
2565 			goto done;
2566 		}
2567 	} else if (asprintf(&header, "commit %s%s",
2568 	    id_str ? id_str : "........................................",
2569 	    ncommits_str) == -1) {
2570 		err = got_error_from_errno("asprintf");
2571 		header = NULL;
2572 		goto done;
2573 	}
2574 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2575 	if (err)
2576 		goto done;
2577 
2578 	werase(view->window);
2579 
2580 	if (view_needs_focus_indication(view))
2581 		wstandout(view->window);
2582 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2583 	if (tc)
2584 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2585 	waddwstr(view->window, wline);
2586 	while (width < view->ncols) {
2587 		waddch(view->window, ' ');
2588 		width++;
2589 	}
2590 	if (tc)
2591 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2592 	if (view_needs_focus_indication(view))
2593 		wstandend(view->window);
2594 	free(wline);
2595 	if (limit <= 1)
2596 		goto done;
2597 
2598 	/* Grow author column size if necessary, and set view->maxx. */
2599 	entry = s->first_displayed_entry;
2600 	ncommits = 0;
2601 	view->maxx = 0;
2602 	while (entry) {
2603 		struct got_commit_object *c = entry->commit;
2604 		char *author, *eol, *msg, *msg0;
2605 		wchar_t *wauthor, *wmsg;
2606 		int width;
2607 		if (ncommits >= limit - 1)
2608 			break;
2609 		if (s->use_committer)
2610 			author = strdup(got_object_commit_get_committer(c));
2611 		else
2612 			author = strdup(got_object_commit_get_author(c));
2613 		if (author == NULL) {
2614 			err = got_error_from_errno("strdup");
2615 			goto done;
2616 		}
2617 		err = format_author(&wauthor, &width, author, COLS,
2618 		    date_display_cols);
2619 		if (author_cols < width)
2620 			author_cols = width;
2621 		free(wauthor);
2622 		free(author);
2623 		if (err)
2624 			goto done;
2625 		err = got_object_commit_get_logmsg(&msg0, c);
2626 		if (err)
2627 			goto done;
2628 		msg = msg0;
2629 		while (*msg == '\n')
2630 			++msg;
2631 		if ((eol = strchr(msg, '\n')))
2632 			*eol = '\0';
2633 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2634 		    date_display_cols + author_cols, 0);
2635 		if (err)
2636 			goto done;
2637 		view->maxx = MAX(view->maxx, width);
2638 		free(msg0);
2639 		free(wmsg);
2640 		ncommits++;
2641 		entry = TAILQ_NEXT(entry, entry);
2642 	}
2643 
2644 	entry = s->first_displayed_entry;
2645 	s->last_displayed_entry = s->first_displayed_entry;
2646 	ncommits = 0;
2647 	while (entry) {
2648 		if (ncommits >= limit - 1)
2649 			break;
2650 		if (ncommits == s->selected)
2651 			wstandout(view->window);
2652 		err = draw_commit(view, entry->commit, entry->id,
2653 		    date_display_cols, author_cols);
2654 		if (ncommits == s->selected)
2655 			wstandend(view->window);
2656 		if (err)
2657 			goto done;
2658 		ncommits++;
2659 		s->last_displayed_entry = entry;
2660 		entry = TAILQ_NEXT(entry, entry);
2661 	}
2662 
2663 	view_border(view);
2664 done:
2665 	free(id_str);
2666 	free(refs_str);
2667 	free(ncommits_str);
2668 	free(header);
2669 	return err;
2670 }
2671 
2672 static void
2673 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2674 {
2675 	struct commit_queue_entry *entry;
2676 	int nscrolled = 0;
2677 
2678 	entry = TAILQ_FIRST(&s->commits->head);
2679 	if (s->first_displayed_entry == entry)
2680 		return;
2681 
2682 	entry = s->first_displayed_entry;
2683 	while (entry && nscrolled < maxscroll) {
2684 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2685 		if (entry) {
2686 			s->first_displayed_entry = entry;
2687 			nscrolled++;
2688 		}
2689 	}
2690 }
2691 
2692 static const struct got_error *
2693 trigger_log_thread(struct tog_view *view, int wait)
2694 {
2695 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2696 	int errcode;
2697 
2698 	halfdelay(1); /* fast refresh while loading commits */
2699 
2700 	while (!ta->log_complete && !tog_thread_error &&
2701 	    (ta->commits_needed > 0 || ta->load_all)) {
2702 		/* Wake the log thread. */
2703 		errcode = pthread_cond_signal(&ta->need_commits);
2704 		if (errcode)
2705 			return got_error_set_errno(errcode,
2706 			    "pthread_cond_signal");
2707 
2708 		/*
2709 		 * The mutex will be released while the view loop waits
2710 		 * in wgetch(), at which time the log thread will run.
2711 		 */
2712 		if (!wait)
2713 			break;
2714 
2715 		/* Display progress update in log view. */
2716 		show_log_view(view);
2717 		update_panels();
2718 		doupdate();
2719 
2720 		/* Wait right here while next commit is being loaded. */
2721 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2722 		if (errcode)
2723 			return got_error_set_errno(errcode,
2724 			    "pthread_cond_wait");
2725 
2726 		/* Display progress update in log view. */
2727 		show_log_view(view);
2728 		update_panels();
2729 		doupdate();
2730 	}
2731 
2732 	return NULL;
2733 }
2734 
2735 static const struct got_error *
2736 request_log_commits(struct tog_view *view)
2737 {
2738 	struct tog_log_view_state	*state = &view->state.log;
2739 	const struct got_error		*err = NULL;
2740 
2741 	if (state->thread_args.log_complete)
2742 		return NULL;
2743 
2744 	state->thread_args.commits_needed += view->nscrolled;
2745 	err = trigger_log_thread(view, 1);
2746 	view->nscrolled = 0;
2747 
2748 	return err;
2749 }
2750 
2751 static const struct got_error *
2752 log_scroll_down(struct tog_view *view, int maxscroll)
2753 {
2754 	struct tog_log_view_state *s = &view->state.log;
2755 	const struct got_error *err = NULL;
2756 	struct commit_queue_entry *pentry;
2757 	int nscrolled = 0, ncommits_needed;
2758 
2759 	if (s->last_displayed_entry == NULL)
2760 		return NULL;
2761 
2762 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2763 	if (s->commits->ncommits < ncommits_needed &&
2764 	    !s->thread_args.log_complete) {
2765 		/*
2766 		 * Ask the log thread for required amount of commits.
2767 		 */
2768 		s->thread_args.commits_needed +=
2769 		    ncommits_needed - s->commits->ncommits;
2770 		err = trigger_log_thread(view, 1);
2771 		if (err)
2772 			return err;
2773 	}
2774 
2775 	do {
2776 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2777 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2778 			break;
2779 
2780 		s->last_displayed_entry = pentry ?
2781 		    pentry : s->last_displayed_entry;
2782 
2783 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2784 		if (pentry == NULL)
2785 			break;
2786 		s->first_displayed_entry = pentry;
2787 	} while (++nscrolled < maxscroll);
2788 
2789 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2790 		view->nscrolled += nscrolled;
2791 	else
2792 		view->nscrolled = 0;
2793 
2794 	return err;
2795 }
2796 
2797 static const struct got_error *
2798 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2799     struct got_commit_object *commit, struct got_object_id *commit_id,
2800     struct tog_view *log_view, struct got_repository *repo)
2801 {
2802 	const struct got_error *err;
2803 	struct got_object_qid *parent_id;
2804 	struct tog_view *diff_view;
2805 
2806 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2807 	if (diff_view == NULL)
2808 		return got_error_from_errno("view_open");
2809 
2810 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2811 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2812 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2813 	if (err == NULL)
2814 		*new_view = diff_view;
2815 	return err;
2816 }
2817 
2818 static const struct got_error *
2819 tree_view_visit_subtree(struct tog_tree_view_state *s,
2820     struct got_tree_object *subtree)
2821 {
2822 	struct tog_parent_tree *parent;
2823 
2824 	parent = calloc(1, sizeof(*parent));
2825 	if (parent == NULL)
2826 		return got_error_from_errno("calloc");
2827 
2828 	parent->tree = s->tree;
2829 	parent->first_displayed_entry = s->first_displayed_entry;
2830 	parent->selected_entry = s->selected_entry;
2831 	parent->selected = s->selected;
2832 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2833 	s->tree = subtree;
2834 	s->selected = 0;
2835 	s->first_displayed_entry = NULL;
2836 	return NULL;
2837 }
2838 
2839 static const struct got_error *
2840 tree_view_walk_path(struct tog_tree_view_state *s,
2841     struct got_commit_object *commit, const char *path)
2842 {
2843 	const struct got_error *err = NULL;
2844 	struct got_tree_object *tree = NULL;
2845 	const char *p;
2846 	char *slash, *subpath = NULL;
2847 
2848 	/* Walk the path and open corresponding tree objects. */
2849 	p = path;
2850 	while (*p) {
2851 		struct got_tree_entry *te;
2852 		struct got_object_id *tree_id;
2853 		char *te_name;
2854 
2855 		while (p[0] == '/')
2856 			p++;
2857 
2858 		/* Ensure the correct subtree entry is selected. */
2859 		slash = strchr(p, '/');
2860 		if (slash == NULL)
2861 			te_name = strdup(p);
2862 		else
2863 			te_name = strndup(p, slash - p);
2864 		if (te_name == NULL) {
2865 			err = got_error_from_errno("strndup");
2866 			break;
2867 		}
2868 		te = got_object_tree_find_entry(s->tree, te_name);
2869 		if (te == NULL) {
2870 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2871 			free(te_name);
2872 			break;
2873 		}
2874 		free(te_name);
2875 		s->first_displayed_entry = s->selected_entry = te;
2876 
2877 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2878 			break; /* jump to this file's entry */
2879 
2880 		slash = strchr(p, '/');
2881 		if (slash)
2882 			subpath = strndup(path, slash - path);
2883 		else
2884 			subpath = strdup(path);
2885 		if (subpath == NULL) {
2886 			err = got_error_from_errno("strdup");
2887 			break;
2888 		}
2889 
2890 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2891 		    subpath);
2892 		if (err)
2893 			break;
2894 
2895 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2896 		free(tree_id);
2897 		if (err)
2898 			break;
2899 
2900 		err = tree_view_visit_subtree(s, tree);
2901 		if (err) {
2902 			got_object_tree_close(tree);
2903 			break;
2904 		}
2905 		if (slash == NULL)
2906 			break;
2907 		free(subpath);
2908 		subpath = NULL;
2909 		p = slash;
2910 	}
2911 
2912 	free(subpath);
2913 	return err;
2914 }
2915 
2916 static const struct got_error *
2917 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2918     struct commit_queue_entry *entry, const char *path,
2919     const char *head_ref_name, struct got_repository *repo)
2920 {
2921 	const struct got_error *err = NULL;
2922 	struct tog_tree_view_state *s;
2923 	struct tog_view *tree_view;
2924 
2925 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2926 	if (tree_view == NULL)
2927 		return got_error_from_errno("view_open");
2928 
2929 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2930 	if (err)
2931 		return err;
2932 	s = &tree_view->state.tree;
2933 
2934 	*new_view = tree_view;
2935 
2936 	if (got_path_is_root_dir(path))
2937 		return NULL;
2938 
2939 	return tree_view_walk_path(s, entry->commit, path);
2940 }
2941 
2942 static const struct got_error *
2943 block_signals_used_by_main_thread(void)
2944 {
2945 	sigset_t sigset;
2946 	int errcode;
2947 
2948 	if (sigemptyset(&sigset) == -1)
2949 		return got_error_from_errno("sigemptyset");
2950 
2951 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2952 	if (sigaddset(&sigset, SIGWINCH) == -1)
2953 		return got_error_from_errno("sigaddset");
2954 	if (sigaddset(&sigset, SIGCONT) == -1)
2955 		return got_error_from_errno("sigaddset");
2956 	if (sigaddset(&sigset, SIGINT) == -1)
2957 		return got_error_from_errno("sigaddset");
2958 	if (sigaddset(&sigset, SIGTERM) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 
2961 	/* ncurses handles SIGTSTP */
2962 	if (sigaddset(&sigset, SIGTSTP) == -1)
2963 		return got_error_from_errno("sigaddset");
2964 
2965 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2966 	if (errcode)
2967 		return got_error_set_errno(errcode, "pthread_sigmask");
2968 
2969 	return NULL;
2970 }
2971 
2972 static void *
2973 log_thread(void *arg)
2974 {
2975 	const struct got_error *err = NULL;
2976 	int errcode = 0;
2977 	struct tog_log_thread_args *a = arg;
2978 	int done = 0;
2979 
2980 	/*
2981 	 * Sync startup with main thread such that we begin our
2982 	 * work once view_input() has released the mutex.
2983 	 */
2984 	errcode = pthread_mutex_lock(&tog_mutex);
2985 	if (errcode) {
2986 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2987 		return (void *)err;
2988 	}
2989 
2990 	err = block_signals_used_by_main_thread();
2991 	if (err) {
2992 		pthread_mutex_unlock(&tog_mutex);
2993 		goto done;
2994 	}
2995 
2996 	while (!done && !err && !tog_fatal_signal_received()) {
2997 		errcode = pthread_mutex_unlock(&tog_mutex);
2998 		if (errcode) {
2999 			err = got_error_set_errno(errcode,
3000 			    "pthread_mutex_unlock");
3001 			goto done;
3002 		}
3003 		err = queue_commits(a);
3004 		if (err) {
3005 			if (err->code != GOT_ERR_ITER_COMPLETED)
3006 				goto done;
3007 			err = NULL;
3008 			done = 1;
3009 		} else if (a->commits_needed > 0 && !a->load_all) {
3010 			if (*a->limiting) {
3011 				if (a->limit_match)
3012 					a->commits_needed--;
3013 			} else
3014 				a->commits_needed--;
3015 		}
3016 
3017 		errcode = pthread_mutex_lock(&tog_mutex);
3018 		if (errcode) {
3019 			err = got_error_set_errno(errcode,
3020 			    "pthread_mutex_lock");
3021 			goto done;
3022 		} else if (*a->quit)
3023 			done = 1;
3024 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3025 			*a->first_displayed_entry =
3026 			    TAILQ_FIRST(&a->limit_commits->head);
3027 			*a->selected_entry = *a->first_displayed_entry;
3028 		} else if (*a->first_displayed_entry == NULL) {
3029 			*a->first_displayed_entry =
3030 			    TAILQ_FIRST(&a->real_commits->head);
3031 			*a->selected_entry = *a->first_displayed_entry;
3032 		}
3033 
3034 		errcode = pthread_cond_signal(&a->commit_loaded);
3035 		if (errcode) {
3036 			err = got_error_set_errno(errcode,
3037 			    "pthread_cond_signal");
3038 			pthread_mutex_unlock(&tog_mutex);
3039 			goto done;
3040 		}
3041 
3042 		if (done)
3043 			a->commits_needed = 0;
3044 		else {
3045 			if (a->commits_needed == 0 && !a->load_all) {
3046 				errcode = pthread_cond_wait(&a->need_commits,
3047 				    &tog_mutex);
3048 				if (errcode) {
3049 					err = got_error_set_errno(errcode,
3050 					    "pthread_cond_wait");
3051 					pthread_mutex_unlock(&tog_mutex);
3052 					goto done;
3053 				}
3054 				if (*a->quit)
3055 					done = 1;
3056 			}
3057 		}
3058 	}
3059 	a->log_complete = 1;
3060 	errcode = pthread_mutex_unlock(&tog_mutex);
3061 	if (errcode)
3062 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3063 done:
3064 	if (err) {
3065 		tog_thread_error = 1;
3066 		pthread_cond_signal(&a->commit_loaded);
3067 	}
3068 	return (void *)err;
3069 }
3070 
3071 static const struct got_error *
3072 stop_log_thread(struct tog_log_view_state *s)
3073 {
3074 	const struct got_error *err = NULL, *thread_err = NULL;
3075 	int errcode;
3076 
3077 	if (s->thread) {
3078 		s->quit = 1;
3079 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3080 		if (errcode)
3081 			return got_error_set_errno(errcode,
3082 			    "pthread_cond_signal");
3083 		errcode = pthread_mutex_unlock(&tog_mutex);
3084 		if (errcode)
3085 			return got_error_set_errno(errcode,
3086 			    "pthread_mutex_unlock");
3087 		errcode = pthread_join(s->thread, (void **)&thread_err);
3088 		if (errcode)
3089 			return got_error_set_errno(errcode, "pthread_join");
3090 		errcode = pthread_mutex_lock(&tog_mutex);
3091 		if (errcode)
3092 			return got_error_set_errno(errcode,
3093 			    "pthread_mutex_lock");
3094 		s->thread = NULL;
3095 	}
3096 
3097 	if (s->thread_args.repo) {
3098 		err = got_repo_close(s->thread_args.repo);
3099 		s->thread_args.repo = NULL;
3100 	}
3101 
3102 	if (s->thread_args.pack_fds) {
3103 		const struct got_error *pack_err =
3104 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3105 		if (err == NULL)
3106 			err = pack_err;
3107 		s->thread_args.pack_fds = NULL;
3108 	}
3109 
3110 	if (s->thread_args.graph) {
3111 		got_commit_graph_close(s->thread_args.graph);
3112 		s->thread_args.graph = NULL;
3113 	}
3114 
3115 	return err ? err : thread_err;
3116 }
3117 
3118 static const struct got_error *
3119 close_log_view(struct tog_view *view)
3120 {
3121 	const struct got_error *err = NULL;
3122 	struct tog_log_view_state *s = &view->state.log;
3123 	int errcode;
3124 
3125 	err = stop_log_thread(s);
3126 
3127 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3128 	if (errcode && err == NULL)
3129 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3130 
3131 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3132 	if (errcode && err == NULL)
3133 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3134 
3135 	free_commits(&s->limit_commits);
3136 	free_commits(&s->real_commits);
3137 	free(s->in_repo_path);
3138 	s->in_repo_path = NULL;
3139 	free(s->start_id);
3140 	s->start_id = NULL;
3141 	free(s->head_ref_name);
3142 	s->head_ref_name = NULL;
3143 	return err;
3144 }
3145 
3146 /*
3147  * We use two queues to implement the limit feature: first consists of
3148  * commits matching the current limit_regex; second is the real queue
3149  * of all known commits (real_commits). When the user starts limiting,
3150  * we swap queues such that all movement and displaying functionality
3151  * works with very slight change.
3152  */
3153 static const struct got_error *
3154 limit_log_view(struct tog_view *view)
3155 {
3156 	struct tog_log_view_state *s = &view->state.log;
3157 	struct commit_queue_entry *entry;
3158 	struct tog_view	*v = view;
3159 	const struct got_error *err = NULL;
3160 	char pattern[1024];
3161 	int ret;
3162 
3163 	if (view_is_hsplit_top(view))
3164 		v = view->child;
3165 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3166 		v = view->parent;
3167 
3168 	/* Get the pattern */
3169 	wmove(v->window, v->nlines - 1, 0);
3170 	wclrtoeol(v->window);
3171 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3172 	nodelay(v->window, FALSE);
3173 	nocbreak();
3174 	echo();
3175 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3176 	cbreak();
3177 	noecho();
3178 	nodelay(v->window, TRUE);
3179 	if (ret == ERR)
3180 		return NULL;
3181 
3182 	if (*pattern == '\0') {
3183 		/*
3184 		 * Safety measure for the situation where the user
3185 		 * resets limit without previously limiting anything.
3186 		 */
3187 		if (!s->limit_view)
3188 			return NULL;
3189 
3190 		/*
3191 		 * User could have pressed Ctrl+L, which refreshed the
3192 		 * commit queues, it means we can't save previously
3193 		 * (before limit took place) displayed entries,
3194 		 * because they would point to already free'ed memory,
3195 		 * so we are forced to always select first entry of
3196 		 * the queue.
3197 		 */
3198 		s->commits = &s->real_commits;
3199 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3200 		s->selected_entry = s->first_displayed_entry;
3201 		s->selected = 0;
3202 		s->limit_view = 0;
3203 
3204 		return NULL;
3205 	}
3206 
3207 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3208 		return NULL;
3209 
3210 	s->limit_view = 1;
3211 
3212 	/* Clear the screen while loading limit view */
3213 	s->first_displayed_entry = NULL;
3214 	s->last_displayed_entry = NULL;
3215 	s->selected_entry = NULL;
3216 	s->commits = &s->limit_commits;
3217 
3218 	/* Prepare limit queue for new search */
3219 	free_commits(&s->limit_commits);
3220 	s->limit_commits.ncommits = 0;
3221 
3222 	/* First process commits, which are in queue already */
3223 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3224 		int have_match = 0;
3225 
3226 		err = match_commit(&have_match, entry->id,
3227 		    entry->commit, &s->limit_regex);
3228 		if (err)
3229 			return err;
3230 
3231 		if (have_match) {
3232 			struct commit_queue_entry *matched;
3233 
3234 			matched = alloc_commit_queue_entry(entry->commit,
3235 			    entry->id);
3236 			if (matched == NULL) {
3237 				err = got_error_from_errno(
3238 				    "alloc_commit_queue_entry");
3239 				break;
3240 			}
3241 			matched->commit = entry->commit;
3242 			got_object_commit_retain(entry->commit);
3243 
3244 			matched->idx = s->limit_commits.ncommits;
3245 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3246 			    matched, entry);
3247 			s->limit_commits.ncommits++;
3248 		}
3249 	}
3250 
3251 	/* Second process all the commits, until we fill the screen */
3252 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3253 	    !s->thread_args.log_complete) {
3254 		s->thread_args.commits_needed +=
3255 		    view->nlines - s->limit_commits.ncommits - 1;
3256 		err = trigger_log_thread(view, 1);
3257 		if (err)
3258 			return err;
3259 	}
3260 
3261 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3262 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3263 	s->selected = 0;
3264 
3265 	return NULL;
3266 }
3267 
3268 static const struct got_error *
3269 search_start_log_view(struct tog_view *view)
3270 {
3271 	struct tog_log_view_state *s = &view->state.log;
3272 
3273 	s->matched_entry = NULL;
3274 	s->search_entry = NULL;
3275 	return NULL;
3276 }
3277 
3278 static const struct got_error *
3279 search_next_log_view(struct tog_view *view)
3280 {
3281 	const struct got_error *err = NULL;
3282 	struct tog_log_view_state *s = &view->state.log;
3283 	struct commit_queue_entry *entry;
3284 
3285 	/* Display progress update in log view. */
3286 	show_log_view(view);
3287 	update_panels();
3288 	doupdate();
3289 
3290 	if (s->search_entry) {
3291 		int errcode, ch;
3292 		errcode = pthread_mutex_unlock(&tog_mutex);
3293 		if (errcode)
3294 			return got_error_set_errno(errcode,
3295 			    "pthread_mutex_unlock");
3296 		ch = wgetch(view->window);
3297 		errcode = pthread_mutex_lock(&tog_mutex);
3298 		if (errcode)
3299 			return got_error_set_errno(errcode,
3300 			    "pthread_mutex_lock");
3301 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3302 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3303 			return NULL;
3304 		}
3305 		if (view->searching == TOG_SEARCH_FORWARD)
3306 			entry = TAILQ_NEXT(s->search_entry, entry);
3307 		else
3308 			entry = TAILQ_PREV(s->search_entry,
3309 			    commit_queue_head, entry);
3310 	} else if (s->matched_entry) {
3311 		/*
3312 		 * If the user has moved the cursor after we hit a match,
3313 		 * the position from where we should continue searching
3314 		 * might have changed.
3315 		 */
3316 		if (view->searching == TOG_SEARCH_FORWARD)
3317 			entry = TAILQ_NEXT(s->selected_entry, entry);
3318 		else
3319 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3320 			    entry);
3321 	} else {
3322 		entry = s->selected_entry;
3323 	}
3324 
3325 	while (1) {
3326 		int have_match = 0;
3327 
3328 		if (entry == NULL) {
3329 			if (s->thread_args.log_complete ||
3330 			    view->searching == TOG_SEARCH_BACKWARD) {
3331 				view->search_next_done =
3332 				    (s->matched_entry == NULL ?
3333 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3334 				s->search_entry = NULL;
3335 				return NULL;
3336 			}
3337 			/*
3338 			 * Poke the log thread for more commits and return,
3339 			 * allowing the main loop to make progress. Search
3340 			 * will resume at s->search_entry once we come back.
3341 			 */
3342 			s->thread_args.commits_needed++;
3343 			return trigger_log_thread(view, 0);
3344 		}
3345 
3346 		err = match_commit(&have_match, entry->id, entry->commit,
3347 		    &view->regex);
3348 		if (err)
3349 			break;
3350 		if (have_match) {
3351 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3352 			s->matched_entry = entry;
3353 			break;
3354 		}
3355 
3356 		s->search_entry = entry;
3357 		if (view->searching == TOG_SEARCH_FORWARD)
3358 			entry = TAILQ_NEXT(entry, entry);
3359 		else
3360 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3361 	}
3362 
3363 	if (s->matched_entry) {
3364 		int cur = s->selected_entry->idx;
3365 		while (cur < s->matched_entry->idx) {
3366 			err = input_log_view(NULL, view, KEY_DOWN);
3367 			if (err)
3368 				return err;
3369 			cur++;
3370 		}
3371 		while (cur > s->matched_entry->idx) {
3372 			err = input_log_view(NULL, view, KEY_UP);
3373 			if (err)
3374 				return err;
3375 			cur--;
3376 		}
3377 	}
3378 
3379 	s->search_entry = NULL;
3380 
3381 	return NULL;
3382 }
3383 
3384 static const struct got_error *
3385 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3386     struct got_repository *repo, const char *head_ref_name,
3387     const char *in_repo_path, int log_branches)
3388 {
3389 	const struct got_error *err = NULL;
3390 	struct tog_log_view_state *s = &view->state.log;
3391 	struct got_repository *thread_repo = NULL;
3392 	struct got_commit_graph *thread_graph = NULL;
3393 	int errcode;
3394 
3395 	if (in_repo_path != s->in_repo_path) {
3396 		free(s->in_repo_path);
3397 		s->in_repo_path = strdup(in_repo_path);
3398 		if (s->in_repo_path == NULL)
3399 			return got_error_from_errno("strdup");
3400 	}
3401 
3402 	/* The commit queue only contains commits being displayed. */
3403 	TAILQ_INIT(&s->real_commits.head);
3404 	s->real_commits.ncommits = 0;
3405 	s->commits = &s->real_commits;
3406 
3407 	TAILQ_INIT(&s->limit_commits.head);
3408 	s->limit_view = 0;
3409 	s->limit_commits.ncommits = 0;
3410 
3411 	s->repo = repo;
3412 	if (head_ref_name) {
3413 		s->head_ref_name = strdup(head_ref_name);
3414 		if (s->head_ref_name == NULL) {
3415 			err = got_error_from_errno("strdup");
3416 			goto done;
3417 		}
3418 	}
3419 	s->start_id = got_object_id_dup(start_id);
3420 	if (s->start_id == NULL) {
3421 		err = got_error_from_errno("got_object_id_dup");
3422 		goto done;
3423 	}
3424 	s->log_branches = log_branches;
3425 	s->use_committer = 1;
3426 
3427 	STAILQ_INIT(&s->colors);
3428 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3429 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3430 		    get_color_value("TOG_COLOR_COMMIT"));
3431 		if (err)
3432 			goto done;
3433 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3434 		    get_color_value("TOG_COLOR_AUTHOR"));
3435 		if (err) {
3436 			free_colors(&s->colors);
3437 			goto done;
3438 		}
3439 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3440 		    get_color_value("TOG_COLOR_DATE"));
3441 		if (err) {
3442 			free_colors(&s->colors);
3443 			goto done;
3444 		}
3445 	}
3446 
3447 	view->show = show_log_view;
3448 	view->input = input_log_view;
3449 	view->resize = resize_log_view;
3450 	view->close = close_log_view;
3451 	view->search_start = search_start_log_view;
3452 	view->search_next = search_next_log_view;
3453 
3454 	if (s->thread_args.pack_fds == NULL) {
3455 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3456 		if (err)
3457 			goto done;
3458 	}
3459 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3460 	    s->thread_args.pack_fds);
3461 	if (err)
3462 		goto done;
3463 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3464 	    !s->log_branches);
3465 	if (err)
3466 		goto done;
3467 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3468 	    s->repo, NULL, NULL);
3469 	if (err)
3470 		goto done;
3471 
3472 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3473 	if (errcode) {
3474 		err = got_error_set_errno(errcode, "pthread_cond_init");
3475 		goto done;
3476 	}
3477 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3478 	if (errcode) {
3479 		err = got_error_set_errno(errcode, "pthread_cond_init");
3480 		goto done;
3481 	}
3482 
3483 	s->thread_args.commits_needed = view->nlines;
3484 	s->thread_args.graph = thread_graph;
3485 	s->thread_args.real_commits = &s->real_commits;
3486 	s->thread_args.limit_commits = &s->limit_commits;
3487 	s->thread_args.in_repo_path = s->in_repo_path;
3488 	s->thread_args.start_id = s->start_id;
3489 	s->thread_args.repo = thread_repo;
3490 	s->thread_args.log_complete = 0;
3491 	s->thread_args.quit = &s->quit;
3492 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3493 	s->thread_args.selected_entry = &s->selected_entry;
3494 	s->thread_args.searching = &view->searching;
3495 	s->thread_args.search_next_done = &view->search_next_done;
3496 	s->thread_args.regex = &view->regex;
3497 	s->thread_args.limiting = &s->limit_view;
3498 	s->thread_args.limit_regex = &s->limit_regex;
3499 	s->thread_args.limit_commits = &s->limit_commits;
3500 done:
3501 	if (err)
3502 		close_log_view(view);
3503 	return err;
3504 }
3505 
3506 static const struct got_error *
3507 show_log_view(struct tog_view *view)
3508 {
3509 	const struct got_error *err;
3510 	struct tog_log_view_state *s = &view->state.log;
3511 
3512 	if (s->thread == NULL) {
3513 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3514 		    &s->thread_args);
3515 		if (errcode)
3516 			return got_error_set_errno(errcode, "pthread_create");
3517 		if (s->thread_args.commits_needed > 0) {
3518 			err = trigger_log_thread(view, 1);
3519 			if (err)
3520 				return err;
3521 		}
3522 	}
3523 
3524 	return draw_commits(view);
3525 }
3526 
3527 static void
3528 log_move_cursor_up(struct tog_view *view, int page, int home)
3529 {
3530 	struct tog_log_view_state *s = &view->state.log;
3531 
3532 	if (s->first_displayed_entry == NULL)
3533 		return;
3534 	if (s->selected_entry->idx == 0)
3535 		view->count = 0;
3536 
3537 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3538 	    || home)
3539 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3540 
3541 	if (!page && !home && s->selected > 0)
3542 		--s->selected;
3543 	else
3544 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3545 
3546 	select_commit(s);
3547 	return;
3548 }
3549 
3550 static const struct got_error *
3551 log_move_cursor_down(struct tog_view *view, int page)
3552 {
3553 	struct tog_log_view_state	*s = &view->state.log;
3554 	const struct got_error		*err = NULL;
3555 	int				 eos = view->nlines - 2;
3556 
3557 	if (s->first_displayed_entry == NULL)
3558 		return NULL;
3559 
3560 	if (s->thread_args.log_complete &&
3561 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3562 		return NULL;
3563 
3564 	if (view_is_hsplit_top(view))
3565 		--eos;  /* border consumes the last line */
3566 
3567 	if (!page) {
3568 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3569 			++s->selected;
3570 		else
3571 			err = log_scroll_down(view, 1);
3572 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3573 		struct commit_queue_entry *entry;
3574 		int n;
3575 
3576 		s->selected = 0;
3577 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3578 		s->last_displayed_entry = entry;
3579 		for (n = 0; n <= eos; n++) {
3580 			if (entry == NULL)
3581 				break;
3582 			s->first_displayed_entry = entry;
3583 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3584 		}
3585 		if (n > 0)
3586 			s->selected = n - 1;
3587 	} else {
3588 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3589 		    s->thread_args.log_complete)
3590 			s->selected += MIN(page,
3591 			    s->commits->ncommits - s->selected_entry->idx - 1);
3592 		else
3593 			err = log_scroll_down(view, page);
3594 	}
3595 	if (err)
3596 		return err;
3597 
3598 	/*
3599 	 * We might necessarily overshoot in horizontal
3600 	 * splits; if so, select the last displayed commit.
3601 	 */
3602 	if (s->first_displayed_entry && s->last_displayed_entry) {
3603 		s->selected = MIN(s->selected,
3604 		    s->last_displayed_entry->idx -
3605 		    s->first_displayed_entry->idx);
3606 	}
3607 
3608 	select_commit(s);
3609 
3610 	if (s->thread_args.log_complete &&
3611 	    s->selected_entry->idx == s->commits->ncommits - 1)
3612 		view->count = 0;
3613 
3614 	return NULL;
3615 }
3616 
3617 static void
3618 view_get_split(struct tog_view *view, int *y, int *x)
3619 {
3620 	*x = 0;
3621 	*y = 0;
3622 
3623 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3624 		if (view->child && view->child->resized_y)
3625 			*y = view->child->resized_y;
3626 		else if (view->resized_y)
3627 			*y = view->resized_y;
3628 		else
3629 			*y = view_split_begin_y(view->lines);
3630 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3631 		if (view->child && view->child->resized_x)
3632 			*x = view->child->resized_x;
3633 		else if (view->resized_x)
3634 			*x = view->resized_x;
3635 		else
3636 			*x = view_split_begin_x(view->begin_x);
3637 	}
3638 }
3639 
3640 /* Split view horizontally at y and offset view->state->selected line. */
3641 static const struct got_error *
3642 view_init_hsplit(struct tog_view *view, int y)
3643 {
3644 	const struct got_error *err = NULL;
3645 
3646 	view->nlines = y;
3647 	view->ncols = COLS;
3648 	err = view_resize(view);
3649 	if (err)
3650 		return err;
3651 
3652 	err = offset_selection_down(view);
3653 
3654 	return err;
3655 }
3656 
3657 static const struct got_error *
3658 log_goto_line(struct tog_view *view, int nlines)
3659 {
3660 	const struct got_error		*err = NULL;
3661 	struct tog_log_view_state	*s = &view->state.log;
3662 	int				 g, idx = s->selected_entry->idx;
3663 
3664 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3665 		return NULL;
3666 
3667 	g = view->gline;
3668 	view->gline = 0;
3669 
3670 	if (g >= s->first_displayed_entry->idx + 1 &&
3671 	    g <= s->last_displayed_entry->idx + 1 &&
3672 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3673 		s->selected = g - s->first_displayed_entry->idx - 1;
3674 		select_commit(s);
3675 		return NULL;
3676 	}
3677 
3678 	if (idx + 1 < g) {
3679 		err = log_move_cursor_down(view, g - idx - 1);
3680 		if (!err && g > s->selected_entry->idx + 1)
3681 			err = log_move_cursor_down(view,
3682 			    g - s->first_displayed_entry->idx - 1);
3683 		if (err)
3684 			return err;
3685 	} else if (idx + 1 > g)
3686 		log_move_cursor_up(view, idx - g + 1, 0);
3687 
3688 	if (g < nlines && s->first_displayed_entry->idx == 0)
3689 		s->selected = g - 1;
3690 
3691 	select_commit(s);
3692 	return NULL;
3693 
3694 }
3695 
3696 static void
3697 horizontal_scroll_input(struct tog_view *view, int ch)
3698 {
3699 
3700 	switch (ch) {
3701 	case KEY_LEFT:
3702 	case 'h':
3703 		view->x -= MIN(view->x, 2);
3704 		if (view->x <= 0)
3705 			view->count = 0;
3706 		break;
3707 	case KEY_RIGHT:
3708 	case 'l':
3709 		if (view->x + view->ncols / 2 < view->maxx)
3710 			view->x += 2;
3711 		else
3712 			view->count = 0;
3713 		break;
3714 	case '0':
3715 		view->x = 0;
3716 		break;
3717 	case '$':
3718 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3719 		view->count = 0;
3720 		break;
3721 	default:
3722 		break;
3723 	}
3724 }
3725 
3726 static const struct got_error *
3727 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3728 {
3729 	const struct got_error *err = NULL;
3730 	struct tog_log_view_state *s = &view->state.log;
3731 	int eos, nscroll;
3732 
3733 	if (s->thread_args.load_all) {
3734 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3735 			s->thread_args.load_all = 0;
3736 		else if (s->thread_args.log_complete) {
3737 			err = log_move_cursor_down(view, s->commits->ncommits);
3738 			s->thread_args.load_all = 0;
3739 		}
3740 		if (err)
3741 			return err;
3742 	}
3743 
3744 	eos = nscroll = view->nlines - 1;
3745 	if (view_is_hsplit_top(view))
3746 		--eos;  /* border */
3747 
3748 	if (view->gline)
3749 		return log_goto_line(view, eos);
3750 
3751 	switch (ch) {
3752 	case '&':
3753 		err = limit_log_view(view);
3754 		break;
3755 	case 'q':
3756 		s->quit = 1;
3757 		break;
3758 	case '0':
3759 	case '$':
3760 	case KEY_RIGHT:
3761 	case 'l':
3762 	case KEY_LEFT:
3763 	case 'h':
3764 		horizontal_scroll_input(view, ch);
3765 		break;
3766 	case 'k':
3767 	case KEY_UP:
3768 	case '<':
3769 	case ',':
3770 	case CTRL('p'):
3771 		log_move_cursor_up(view, 0, 0);
3772 		break;
3773 	case 'g':
3774 	case '=':
3775 	case KEY_HOME:
3776 		log_move_cursor_up(view, 0, 1);
3777 		view->count = 0;
3778 		break;
3779 	case CTRL('u'):
3780 	case 'u':
3781 		nscroll /= 2;
3782 		/* FALL THROUGH */
3783 	case KEY_PPAGE:
3784 	case CTRL('b'):
3785 	case 'b':
3786 		log_move_cursor_up(view, nscroll, 0);
3787 		break;
3788 	case 'j':
3789 	case KEY_DOWN:
3790 	case '>':
3791 	case '.':
3792 	case CTRL('n'):
3793 		err = log_move_cursor_down(view, 0);
3794 		break;
3795 	case '@':
3796 		s->use_committer = !s->use_committer;
3797 		view->action = s->use_committer ?
3798 		    "show committer" : "show commit author";
3799 		break;
3800 	case 'G':
3801 	case '*':
3802 	case KEY_END: {
3803 		/* We don't know yet how many commits, so we're forced to
3804 		 * traverse them all. */
3805 		view->count = 0;
3806 		s->thread_args.load_all = 1;
3807 		if (!s->thread_args.log_complete)
3808 			return trigger_log_thread(view, 0);
3809 		err = log_move_cursor_down(view, s->commits->ncommits);
3810 		s->thread_args.load_all = 0;
3811 		break;
3812 	}
3813 	case CTRL('d'):
3814 	case 'd':
3815 		nscroll /= 2;
3816 		/* FALL THROUGH */
3817 	case KEY_NPAGE:
3818 	case CTRL('f'):
3819 	case 'f':
3820 	case ' ':
3821 		err = log_move_cursor_down(view, nscroll);
3822 		break;
3823 	case KEY_RESIZE:
3824 		if (s->selected > view->nlines - 2)
3825 			s->selected = view->nlines - 2;
3826 		if (s->selected > s->commits->ncommits - 1)
3827 			s->selected = s->commits->ncommits - 1;
3828 		select_commit(s);
3829 		if (s->commits->ncommits < view->nlines - 1 &&
3830 		    !s->thread_args.log_complete) {
3831 			s->thread_args.commits_needed += (view->nlines - 1) -
3832 			    s->commits->ncommits;
3833 			err = trigger_log_thread(view, 1);
3834 		}
3835 		break;
3836 	case KEY_ENTER:
3837 	case '\r':
3838 		view->count = 0;
3839 		if (s->selected_entry == NULL)
3840 			break;
3841 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3842 		break;
3843 	case 'T':
3844 		view->count = 0;
3845 		if (s->selected_entry == NULL)
3846 			break;
3847 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3848 		break;
3849 	case KEY_BACKSPACE:
3850 	case CTRL('l'):
3851 	case 'B':
3852 		view->count = 0;
3853 		if (ch == KEY_BACKSPACE &&
3854 		    got_path_is_root_dir(s->in_repo_path))
3855 			break;
3856 		err = stop_log_thread(s);
3857 		if (err)
3858 			return err;
3859 		if (ch == KEY_BACKSPACE) {
3860 			char *parent_path;
3861 			err = got_path_dirname(&parent_path, s->in_repo_path);
3862 			if (err)
3863 				return err;
3864 			free(s->in_repo_path);
3865 			s->in_repo_path = parent_path;
3866 			s->thread_args.in_repo_path = s->in_repo_path;
3867 		} else if (ch == CTRL('l')) {
3868 			struct got_object_id *start_id;
3869 			err = got_repo_match_object_id(&start_id, NULL,
3870 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3871 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3872 			if (err) {
3873 				if (s->head_ref_name == NULL ||
3874 				    err->code != GOT_ERR_NOT_REF)
3875 					return err;
3876 				/* Try to cope with deleted references. */
3877 				free(s->head_ref_name);
3878 				s->head_ref_name = NULL;
3879 				err = got_repo_match_object_id(&start_id,
3880 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3881 				    &tog_refs, s->repo);
3882 				if (err)
3883 					return err;
3884 			}
3885 			free(s->start_id);
3886 			s->start_id = start_id;
3887 			s->thread_args.start_id = s->start_id;
3888 		} else /* 'B' */
3889 			s->log_branches = !s->log_branches;
3890 
3891 		if (s->thread_args.pack_fds == NULL) {
3892 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3893 			if (err)
3894 				return err;
3895 		}
3896 		err = got_repo_open(&s->thread_args.repo,
3897 		    got_repo_get_path(s->repo), NULL,
3898 		    s->thread_args.pack_fds);
3899 		if (err)
3900 			return err;
3901 		tog_free_refs();
3902 		err = tog_load_refs(s->repo, 0);
3903 		if (err)
3904 			return err;
3905 		err = got_commit_graph_open(&s->thread_args.graph,
3906 		    s->in_repo_path, !s->log_branches);
3907 		if (err)
3908 			return err;
3909 		err = got_commit_graph_iter_start(s->thread_args.graph,
3910 		    s->start_id, s->repo, NULL, NULL);
3911 		if (err)
3912 			return err;
3913 		free_commits(&s->real_commits);
3914 		free_commits(&s->limit_commits);
3915 		s->first_displayed_entry = NULL;
3916 		s->last_displayed_entry = NULL;
3917 		s->selected_entry = NULL;
3918 		s->selected = 0;
3919 		s->thread_args.log_complete = 0;
3920 		s->quit = 0;
3921 		s->thread_args.commits_needed = view->lines;
3922 		s->matched_entry = NULL;
3923 		s->search_entry = NULL;
3924 		view->offset = 0;
3925 		break;
3926 	case 'R':
3927 		view->count = 0;
3928 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3929 		break;
3930 	default:
3931 		view->count = 0;
3932 		break;
3933 	}
3934 
3935 	return err;
3936 }
3937 
3938 static const struct got_error *
3939 apply_unveil(const char *repo_path, const char *worktree_path)
3940 {
3941 	const struct got_error *error;
3942 
3943 #ifdef PROFILE
3944 	if (unveil("gmon.out", "rwc") != 0)
3945 		return got_error_from_errno2("unveil", "gmon.out");
3946 #endif
3947 	if (repo_path && unveil(repo_path, "r") != 0)
3948 		return got_error_from_errno2("unveil", repo_path);
3949 
3950 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3951 		return got_error_from_errno2("unveil", worktree_path);
3952 
3953 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3954 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3955 
3956 	error = got_privsep_unveil_exec_helpers();
3957 	if (error != NULL)
3958 		return error;
3959 
3960 	if (unveil(NULL, NULL) != 0)
3961 		return got_error_from_errno("unveil");
3962 
3963 	return NULL;
3964 }
3965 
3966 static void
3967 init_curses(void)
3968 {
3969 	/*
3970 	 * Override default signal handlers before starting ncurses.
3971 	 * This should prevent ncurses from installing its own
3972 	 * broken cleanup() signal handler.
3973 	 */
3974 	signal(SIGWINCH, tog_sigwinch);
3975 	signal(SIGPIPE, tog_sigpipe);
3976 	signal(SIGCONT, tog_sigcont);
3977 	signal(SIGINT, tog_sigint);
3978 	signal(SIGTERM, tog_sigterm);
3979 
3980 	initscr();
3981 	cbreak();
3982 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3983 	noecho();
3984 	nonl();
3985 	intrflush(stdscr, FALSE);
3986 	keypad(stdscr, TRUE);
3987 	curs_set(0);
3988 	if (getenv("TOG_COLORS") != NULL) {
3989 		start_color();
3990 		use_default_colors();
3991 	}
3992 }
3993 
3994 static const struct got_error *
3995 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3996     struct got_repository *repo, struct got_worktree *worktree)
3997 {
3998 	const struct got_error *err = NULL;
3999 
4000 	if (argc == 0) {
4001 		*in_repo_path = strdup("/");
4002 		if (*in_repo_path == NULL)
4003 			return got_error_from_errno("strdup");
4004 		return NULL;
4005 	}
4006 
4007 	if (worktree) {
4008 		const char *prefix = got_worktree_get_path_prefix(worktree);
4009 		char *p;
4010 
4011 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4012 		if (err)
4013 			return err;
4014 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4015 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4016 		    p) == -1) {
4017 			err = got_error_from_errno("asprintf");
4018 			*in_repo_path = NULL;
4019 		}
4020 		free(p);
4021 	} else
4022 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4023 
4024 	return err;
4025 }
4026 
4027 static const struct got_error *
4028 cmd_log(int argc, char *argv[])
4029 {
4030 	const struct got_error *error;
4031 	struct got_repository *repo = NULL;
4032 	struct got_worktree *worktree = NULL;
4033 	struct got_object_id *start_id = NULL;
4034 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4035 	char *start_commit = NULL, *label = NULL;
4036 	struct got_reference *ref = NULL;
4037 	const char *head_ref_name = NULL;
4038 	int ch, log_branches = 0;
4039 	struct tog_view *view;
4040 	int *pack_fds = NULL;
4041 
4042 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4043 		switch (ch) {
4044 		case 'b':
4045 			log_branches = 1;
4046 			break;
4047 		case 'c':
4048 			start_commit = optarg;
4049 			break;
4050 		case 'r':
4051 			repo_path = realpath(optarg, NULL);
4052 			if (repo_path == NULL)
4053 				return got_error_from_errno2("realpath",
4054 				    optarg);
4055 			break;
4056 		default:
4057 			usage_log();
4058 			/* NOTREACHED */
4059 		}
4060 	}
4061 
4062 	argc -= optind;
4063 	argv += optind;
4064 
4065 	if (argc > 1)
4066 		usage_log();
4067 
4068 	error = got_repo_pack_fds_open(&pack_fds);
4069 	if (error != NULL)
4070 		goto done;
4071 
4072 	if (repo_path == NULL) {
4073 		cwd = getcwd(NULL, 0);
4074 		if (cwd == NULL)
4075 			return got_error_from_errno("getcwd");
4076 		error = got_worktree_open(&worktree, cwd);
4077 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4078 			goto done;
4079 		if (worktree)
4080 			repo_path =
4081 			    strdup(got_worktree_get_repo_path(worktree));
4082 		else
4083 			repo_path = strdup(cwd);
4084 		if (repo_path == NULL) {
4085 			error = got_error_from_errno("strdup");
4086 			goto done;
4087 		}
4088 	}
4089 
4090 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4091 	if (error != NULL)
4092 		goto done;
4093 
4094 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4095 	    repo, worktree);
4096 	if (error)
4097 		goto done;
4098 
4099 	init_curses();
4100 
4101 	error = apply_unveil(got_repo_get_path(repo),
4102 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4103 	if (error)
4104 		goto done;
4105 
4106 	/* already loaded by tog_log_with_path()? */
4107 	if (TAILQ_EMPTY(&tog_refs)) {
4108 		error = tog_load_refs(repo, 0);
4109 		if (error)
4110 			goto done;
4111 	}
4112 
4113 	if (start_commit == NULL) {
4114 		error = got_repo_match_object_id(&start_id, &label,
4115 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4116 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4117 		if (error)
4118 			goto done;
4119 		head_ref_name = label;
4120 	} else {
4121 		error = got_ref_open(&ref, repo, start_commit, 0);
4122 		if (error == NULL)
4123 			head_ref_name = got_ref_get_name(ref);
4124 		else if (error->code != GOT_ERR_NOT_REF)
4125 			goto done;
4126 		error = got_repo_match_object_id(&start_id, NULL,
4127 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4128 		if (error)
4129 			goto done;
4130 	}
4131 
4132 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4133 	if (view == NULL) {
4134 		error = got_error_from_errno("view_open");
4135 		goto done;
4136 	}
4137 	error = open_log_view(view, start_id, repo, head_ref_name,
4138 	    in_repo_path, log_branches);
4139 	if (error)
4140 		goto done;
4141 	if (worktree) {
4142 		/* Release work tree lock. */
4143 		got_worktree_close(worktree);
4144 		worktree = NULL;
4145 	}
4146 	error = view_loop(view);
4147 done:
4148 	free(in_repo_path);
4149 	free(repo_path);
4150 	free(cwd);
4151 	free(start_id);
4152 	free(label);
4153 	if (ref)
4154 		got_ref_close(ref);
4155 	if (repo) {
4156 		const struct got_error *close_err = got_repo_close(repo);
4157 		if (error == NULL)
4158 			error = close_err;
4159 	}
4160 	if (worktree)
4161 		got_worktree_close(worktree);
4162 	if (pack_fds) {
4163 		const struct got_error *pack_err =
4164 		    got_repo_pack_fds_close(pack_fds);
4165 		if (error == NULL)
4166 			error = pack_err;
4167 	}
4168 	tog_free_refs();
4169 	return error;
4170 }
4171 
4172 __dead static void
4173 usage_diff(void)
4174 {
4175 	endwin();
4176 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4177 	    "object1 object2\n", getprogname());
4178 	exit(1);
4179 }
4180 
4181 static int
4182 match_line(const char *line, regex_t *regex, size_t nmatch,
4183     regmatch_t *regmatch)
4184 {
4185 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4186 }
4187 
4188 static struct tog_color *
4189 match_color(struct tog_colors *colors, const char *line)
4190 {
4191 	struct tog_color *tc = NULL;
4192 
4193 	STAILQ_FOREACH(tc, colors, entry) {
4194 		if (match_line(line, &tc->regex, 0, NULL))
4195 			return tc;
4196 	}
4197 
4198 	return NULL;
4199 }
4200 
4201 static const struct got_error *
4202 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4203     WINDOW *window, int skipcol, regmatch_t *regmatch)
4204 {
4205 	const struct got_error *err = NULL;
4206 	char *exstr = NULL;
4207 	wchar_t *wline = NULL;
4208 	int rme, rms, n, width, scrollx;
4209 	int width0 = 0, width1 = 0, width2 = 0;
4210 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4211 
4212 	*wtotal = 0;
4213 
4214 	rms = regmatch->rm_so;
4215 	rme = regmatch->rm_eo;
4216 
4217 	err = expand_tab(&exstr, line);
4218 	if (err)
4219 		return err;
4220 
4221 	/* Split the line into 3 segments, according to match offsets. */
4222 	seg0 = strndup(exstr, rms);
4223 	if (seg0 == NULL) {
4224 		err = got_error_from_errno("strndup");
4225 		goto done;
4226 	}
4227 	seg1 = strndup(exstr + rms, rme - rms);
4228 	if (seg1 == NULL) {
4229 		err = got_error_from_errno("strndup");
4230 		goto done;
4231 	}
4232 	seg2 = strdup(exstr + rme);
4233 	if (seg2 == NULL) {
4234 		err = got_error_from_errno("strndup");
4235 		goto done;
4236 	}
4237 
4238 	/* draw up to matched token if we haven't scrolled past it */
4239 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4240 	    col_tab_align, 1);
4241 	if (err)
4242 		goto done;
4243 	n = MAX(width0 - skipcol, 0);
4244 	if (n) {
4245 		free(wline);
4246 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4247 		    wlimit, col_tab_align, 1);
4248 		if (err)
4249 			goto done;
4250 		waddwstr(window, &wline[scrollx]);
4251 		wlimit -= width;
4252 		*wtotal += width;
4253 	}
4254 
4255 	if (wlimit > 0) {
4256 		int i = 0, w = 0;
4257 		size_t wlen;
4258 
4259 		free(wline);
4260 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4261 		    col_tab_align, 1);
4262 		if (err)
4263 			goto done;
4264 		wlen = wcslen(wline);
4265 		while (i < wlen) {
4266 			width = wcwidth(wline[i]);
4267 			if (width == -1) {
4268 				/* should not happen, tabs are expanded */
4269 				err = got_error(GOT_ERR_RANGE);
4270 				goto done;
4271 			}
4272 			if (width0 + w + width > skipcol)
4273 				break;
4274 			w += width;
4275 			i++;
4276 		}
4277 		/* draw (visible part of) matched token (if scrolled into it) */
4278 		if (width1 - w > 0) {
4279 			wattron(window, A_STANDOUT);
4280 			waddwstr(window, &wline[i]);
4281 			wattroff(window, A_STANDOUT);
4282 			wlimit -= (width1 - w);
4283 			*wtotal += (width1 - w);
4284 		}
4285 	}
4286 
4287 	if (wlimit > 0) {  /* draw rest of line */
4288 		free(wline);
4289 		if (skipcol > width0 + width1) {
4290 			err = format_line(&wline, &width2, &scrollx, seg2,
4291 			    skipcol - (width0 + width1), wlimit,
4292 			    col_tab_align, 1);
4293 			if (err)
4294 				goto done;
4295 			waddwstr(window, &wline[scrollx]);
4296 		} else {
4297 			err = format_line(&wline, &width2, NULL, seg2, 0,
4298 			    wlimit, col_tab_align, 1);
4299 			if (err)
4300 				goto done;
4301 			waddwstr(window, wline);
4302 		}
4303 		*wtotal += width2;
4304 	}
4305 done:
4306 	free(wline);
4307 	free(exstr);
4308 	free(seg0);
4309 	free(seg1);
4310 	free(seg2);
4311 	return err;
4312 }
4313 
4314 static int
4315 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4316 {
4317 	FILE	*f = NULL;
4318 	int	*eof, *first, *selected;
4319 
4320 	if (view->type == TOG_VIEW_DIFF) {
4321 		struct tog_diff_view_state *s = &view->state.diff;
4322 
4323 		first = &s->first_displayed_line;
4324 		selected = first;
4325 		eof = &s->eof;
4326 		f = s->f;
4327 	} else if (view->type == TOG_VIEW_HELP) {
4328 		struct tog_help_view_state *s = &view->state.help;
4329 
4330 		first = &s->first_displayed_line;
4331 		selected = first;
4332 		eof = &s->eof;
4333 		f = s->f;
4334 	} else if (view->type == TOG_VIEW_BLAME) {
4335 		struct tog_blame_view_state *s = &view->state.blame;
4336 
4337 		first = &s->first_displayed_line;
4338 		selected = &s->selected_line;
4339 		eof = &s->eof;
4340 		f = s->blame.f;
4341 	} else
4342 		return 0;
4343 
4344 	/* Center gline in the middle of the page like vi(1). */
4345 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4346 		return 0;
4347 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4348 		rewind(f);
4349 		*eof = 0;
4350 		*first = 1;
4351 		*lineno = 0;
4352 		*nprinted = 0;
4353 		return 0;
4354 	}
4355 
4356 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4357 		view->gline : (view->nlines - 3) / 2 + 1;
4358 	view->gline = 0;
4359 
4360 	return 1;
4361 }
4362 
4363 static const struct got_error *
4364 draw_file(struct tog_view *view, const char *header)
4365 {
4366 	struct tog_diff_view_state *s = &view->state.diff;
4367 	regmatch_t *regmatch = &view->regmatch;
4368 	const struct got_error *err;
4369 	int nprinted = 0;
4370 	char *line;
4371 	size_t linesize = 0;
4372 	ssize_t linelen;
4373 	wchar_t *wline;
4374 	int width;
4375 	int max_lines = view->nlines;
4376 	int nlines = s->nlines;
4377 	off_t line_offset;
4378 
4379 	s->lineno = s->first_displayed_line - 1;
4380 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4381 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4382 		return got_error_from_errno("fseek");
4383 
4384 	werase(view->window);
4385 
4386 	if (view->gline > s->nlines - 1)
4387 		view->gline = s->nlines - 1;
4388 
4389 	if (header) {
4390 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4391 		    1 : view->gline - (view->nlines - 3) / 2 :
4392 		    s->lineno + s->selected_line;
4393 
4394 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4395 			return got_error_from_errno("asprintf");
4396 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4397 		    0, 0);
4398 		free(line);
4399 		if (err)
4400 			return err;
4401 
4402 		if (view_needs_focus_indication(view))
4403 			wstandout(view->window);
4404 		waddwstr(view->window, wline);
4405 		free(wline);
4406 		wline = NULL;
4407 		while (width++ < view->ncols)
4408 			waddch(view->window, ' ');
4409 		if (view_needs_focus_indication(view))
4410 			wstandend(view->window);
4411 
4412 		if (max_lines <= 1)
4413 			return NULL;
4414 		max_lines--;
4415 	}
4416 
4417 	s->eof = 0;
4418 	view->maxx = 0;
4419 	line = NULL;
4420 	while (max_lines > 0 && nprinted < max_lines) {
4421 		enum got_diff_line_type linetype;
4422 		attr_t attr = 0;
4423 
4424 		linelen = getline(&line, &linesize, s->f);
4425 		if (linelen == -1) {
4426 			if (feof(s->f)) {
4427 				s->eof = 1;
4428 				break;
4429 			}
4430 			free(line);
4431 			return got_ferror(s->f, GOT_ERR_IO);
4432 		}
4433 
4434 		if (++s->lineno < s->first_displayed_line)
4435 			continue;
4436 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4437 			continue;
4438 		if (s->lineno == view->hiline)
4439 			attr = A_STANDOUT;
4440 
4441 		/* Set view->maxx based on full line length. */
4442 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4443 		    view->x ? 1 : 0);
4444 		if (err) {
4445 			free(line);
4446 			return err;
4447 		}
4448 		view->maxx = MAX(view->maxx, width);
4449 		free(wline);
4450 		wline = NULL;
4451 
4452 		linetype = s->lines[s->lineno].type;
4453 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4454 		    linetype < GOT_DIFF_LINE_CONTEXT)
4455 			attr |= COLOR_PAIR(linetype);
4456 		if (attr)
4457 			wattron(view->window, attr);
4458 		if (s->first_displayed_line + nprinted == s->matched_line &&
4459 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4460 			err = add_matched_line(&width, line, view->ncols, 0,
4461 			    view->window, view->x, regmatch);
4462 			if (err) {
4463 				free(line);
4464 				return err;
4465 			}
4466 		} else {
4467 			int skip;
4468 			err = format_line(&wline, &width, &skip, line,
4469 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4470 			if (err) {
4471 				free(line);
4472 				return err;
4473 			}
4474 			waddwstr(view->window, &wline[skip]);
4475 			free(wline);
4476 			wline = NULL;
4477 		}
4478 		if (s->lineno == view->hiline) {
4479 			/* highlight full gline length */
4480 			while (width++ < view->ncols)
4481 				waddch(view->window, ' ');
4482 		} else {
4483 			if (width <= view->ncols - 1)
4484 				waddch(view->window, '\n');
4485 		}
4486 		if (attr)
4487 			wattroff(view->window, attr);
4488 		if (++nprinted == 1)
4489 			s->first_displayed_line = s->lineno;
4490 	}
4491 	free(line);
4492 	if (nprinted >= 1)
4493 		s->last_displayed_line = s->first_displayed_line +
4494 		    (nprinted - 1);
4495 	else
4496 		s->last_displayed_line = s->first_displayed_line;
4497 
4498 	view_border(view);
4499 
4500 	if (s->eof) {
4501 		while (nprinted < view->nlines) {
4502 			waddch(view->window, '\n');
4503 			nprinted++;
4504 		}
4505 
4506 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4507 		    view->ncols, 0, 0);
4508 		if (err) {
4509 			return err;
4510 		}
4511 
4512 		wstandout(view->window);
4513 		waddwstr(view->window, wline);
4514 		free(wline);
4515 		wline = NULL;
4516 		wstandend(view->window);
4517 	}
4518 
4519 	return NULL;
4520 }
4521 
4522 static char *
4523 get_datestr(time_t *time, char *datebuf)
4524 {
4525 	struct tm mytm, *tm;
4526 	char *p, *s;
4527 
4528 	tm = gmtime_r(time, &mytm);
4529 	if (tm == NULL)
4530 		return NULL;
4531 	s = asctime_r(tm, datebuf);
4532 	if (s == NULL)
4533 		return NULL;
4534 	p = strchr(s, '\n');
4535 	if (p)
4536 		*p = '\0';
4537 	return s;
4538 }
4539 
4540 static const struct got_error *
4541 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4542     off_t off, uint8_t type)
4543 {
4544 	struct got_diff_line *p;
4545 
4546 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4547 	if (p == NULL)
4548 		return got_error_from_errno("reallocarray");
4549 	*lines = p;
4550 	(*lines)[*nlines].offset = off;
4551 	(*lines)[*nlines].type = type;
4552 	(*nlines)++;
4553 
4554 	return NULL;
4555 }
4556 
4557 static const struct got_error *
4558 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4559     struct got_diff_line *s_lines, size_t s_nlines)
4560 {
4561 	struct got_diff_line	*p;
4562 	char			 buf[BUFSIZ];
4563 	size_t			 i, r;
4564 
4565 	if (fseeko(src, 0L, SEEK_SET) == -1)
4566 		return got_error_from_errno("fseeko");
4567 
4568 	for (;;) {
4569 		r = fread(buf, 1, sizeof(buf), src);
4570 		if (r == 0) {
4571 			if (ferror(src))
4572 				return got_error_from_errno("fread");
4573 			if (feof(src))
4574 				break;
4575 		}
4576 		if (fwrite(buf, 1, r, dst) != r)
4577 			return got_ferror(dst, GOT_ERR_IO);
4578 	}
4579 
4580 	/*
4581 	 * The diff driver initialises the first line at offset zero when the
4582 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4583 	 */
4584 	for (i = 1; i < s_nlines; ++i)
4585 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4586 
4587 	--s_nlines;
4588 
4589 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4590 	if (p == NULL) {
4591 		/* d_lines is freed in close_diff_view() */
4592 		return got_error_from_errno("reallocarray");
4593 	}
4594 
4595 	*d_lines = p;
4596 
4597 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4598 	*d_nlines += s_nlines;
4599 
4600 	return NULL;
4601 }
4602 
4603 static const struct got_error *
4604 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4605     struct got_object_id *commit_id, struct got_reflist_head *refs,
4606     struct got_repository *repo, int ignore_ws, int force_text_diff,
4607     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4608 {
4609 	const struct got_error *err = NULL;
4610 	char datebuf[26], *datestr;
4611 	struct got_commit_object *commit;
4612 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4613 	time_t committer_time;
4614 	const char *author, *committer;
4615 	char *refs_str = NULL;
4616 	struct got_pathlist_entry *pe;
4617 	off_t outoff = 0;
4618 	int n;
4619 
4620 	if (refs) {
4621 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4622 		if (err)
4623 			return err;
4624 	}
4625 
4626 	err = got_object_open_as_commit(&commit, repo, commit_id);
4627 	if (err)
4628 		return err;
4629 
4630 	err = got_object_id_str(&id_str, commit_id);
4631 	if (err) {
4632 		err = got_error_from_errno("got_object_id_str");
4633 		goto done;
4634 	}
4635 
4636 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4637 	if (err)
4638 		goto done;
4639 
4640 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4641 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4642 	if (n < 0) {
4643 		err = got_error_from_errno("fprintf");
4644 		goto done;
4645 	}
4646 	outoff += n;
4647 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4648 	if (err)
4649 		goto done;
4650 
4651 	n = fprintf(outfile, "from: %s\n",
4652 	    got_object_commit_get_author(commit));
4653 	if (n < 0) {
4654 		err = got_error_from_errno("fprintf");
4655 		goto done;
4656 	}
4657 	outoff += n;
4658 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4659 	if (err)
4660 		goto done;
4661 
4662 	author = got_object_commit_get_author(commit);
4663 	committer = got_object_commit_get_committer(commit);
4664 	if (strcmp(author, committer) != 0) {
4665 		n = fprintf(outfile, "via: %s\n", committer);
4666 		if (n < 0) {
4667 			err = got_error_from_errno("fprintf");
4668 			goto done;
4669 		}
4670 		outoff += n;
4671 		err = add_line_metadata(lines, nlines, outoff,
4672 		    GOT_DIFF_LINE_AUTHOR);
4673 		if (err)
4674 			goto done;
4675 	}
4676 	committer_time = got_object_commit_get_committer_time(commit);
4677 	datestr = get_datestr(&committer_time, datebuf);
4678 	if (datestr) {
4679 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4680 		if (n < 0) {
4681 			err = got_error_from_errno("fprintf");
4682 			goto done;
4683 		}
4684 		outoff += n;
4685 		err = add_line_metadata(lines, nlines, outoff,
4686 		    GOT_DIFF_LINE_DATE);
4687 		if (err)
4688 			goto done;
4689 	}
4690 	if (got_object_commit_get_nparents(commit) > 1) {
4691 		const struct got_object_id_queue *parent_ids;
4692 		struct got_object_qid *qid;
4693 		int pn = 1;
4694 		parent_ids = got_object_commit_get_parent_ids(commit);
4695 		STAILQ_FOREACH(qid, parent_ids, entry) {
4696 			err = got_object_id_str(&id_str, &qid->id);
4697 			if (err)
4698 				goto done;
4699 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4700 			if (n < 0) {
4701 				err = got_error_from_errno("fprintf");
4702 				goto done;
4703 			}
4704 			outoff += n;
4705 			err = add_line_metadata(lines, nlines, outoff,
4706 			    GOT_DIFF_LINE_META);
4707 			if (err)
4708 				goto done;
4709 			free(id_str);
4710 			id_str = NULL;
4711 		}
4712 	}
4713 
4714 	err = got_object_commit_get_logmsg(&logmsg, commit);
4715 	if (err)
4716 		goto done;
4717 	s = logmsg;
4718 	while ((line = strsep(&s, "\n")) != NULL) {
4719 		n = fprintf(outfile, "%s\n", line);
4720 		if (n < 0) {
4721 			err = got_error_from_errno("fprintf");
4722 			goto done;
4723 		}
4724 		outoff += n;
4725 		err = add_line_metadata(lines, nlines, outoff,
4726 		    GOT_DIFF_LINE_LOGMSG);
4727 		if (err)
4728 			goto done;
4729 	}
4730 
4731 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4732 		struct got_diff_changed_path *cp = pe->data;
4733 		int pad = dsa->max_path_len - pe->path_len + 1;
4734 
4735 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4736 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4737 		    dsa->rm_cols + 1, cp->rm);
4738 		if (n < 0) {
4739 			err = got_error_from_errno("fprintf");
4740 			goto done;
4741 		}
4742 		outoff += n;
4743 		err = add_line_metadata(lines, nlines, outoff,
4744 		    GOT_DIFF_LINE_CHANGES);
4745 		if (err)
4746 			goto done;
4747 	}
4748 
4749 	fputc('\n', outfile);
4750 	outoff++;
4751 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4752 	if (err)
4753 		goto done;
4754 
4755 	n = fprintf(outfile,
4756 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4757 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4758 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4759 	if (n < 0) {
4760 		err = got_error_from_errno("fprintf");
4761 		goto done;
4762 	}
4763 	outoff += n;
4764 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4765 	if (err)
4766 		goto done;
4767 
4768 	fputc('\n', outfile);
4769 	outoff++;
4770 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4771 done:
4772 	free(id_str);
4773 	free(logmsg);
4774 	free(refs_str);
4775 	got_object_commit_close(commit);
4776 	if (err) {
4777 		free(*lines);
4778 		*lines = NULL;
4779 		*nlines = 0;
4780 	}
4781 	return err;
4782 }
4783 
4784 static const struct got_error *
4785 create_diff(struct tog_diff_view_state *s)
4786 {
4787 	const struct got_error *err = NULL;
4788 	FILE *f = NULL, *tmp_diff_file = NULL;
4789 	int obj_type;
4790 	struct got_diff_line *lines = NULL;
4791 	struct got_pathlist_head changed_paths;
4792 
4793 	TAILQ_INIT(&changed_paths);
4794 
4795 	free(s->lines);
4796 	s->lines = malloc(sizeof(*s->lines));
4797 	if (s->lines == NULL)
4798 		return got_error_from_errno("malloc");
4799 	s->nlines = 0;
4800 
4801 	f = got_opentemp();
4802 	if (f == NULL) {
4803 		err = got_error_from_errno("got_opentemp");
4804 		goto done;
4805 	}
4806 	tmp_diff_file = got_opentemp();
4807 	if (tmp_diff_file == NULL) {
4808 		err = got_error_from_errno("got_opentemp");
4809 		goto done;
4810 	}
4811 	if (s->f && fclose(s->f) == EOF) {
4812 		err = got_error_from_errno("fclose");
4813 		goto done;
4814 	}
4815 	s->f = f;
4816 
4817 	if (s->id1)
4818 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4819 	else
4820 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4821 	if (err)
4822 		goto done;
4823 
4824 	switch (obj_type) {
4825 	case GOT_OBJ_TYPE_BLOB:
4826 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4827 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4828 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4829 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4830 		    s->f);
4831 		break;
4832 	case GOT_OBJ_TYPE_TREE:
4833 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4834 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4835 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4836 		    s->force_text_diff, NULL, s->repo, s->f);
4837 		break;
4838 	case GOT_OBJ_TYPE_COMMIT: {
4839 		const struct got_object_id_queue *parent_ids;
4840 		struct got_object_qid *pid;
4841 		struct got_commit_object *commit2;
4842 		struct got_reflist_head *refs;
4843 		size_t nlines = 0;
4844 		struct got_diffstat_cb_arg dsa = {
4845 			0, 0, 0, 0, 0, 0,
4846 			&changed_paths,
4847 			s->ignore_whitespace,
4848 			s->force_text_diff,
4849 			tog_diff_algo
4850 		};
4851 
4852 		lines = malloc(sizeof(*lines));
4853 		if (lines == NULL) {
4854 			err = got_error_from_errno("malloc");
4855 			goto done;
4856 		}
4857 
4858 		/* build diff first in tmp file then append to commit info */
4859 		err = got_diff_objects_as_commits(&lines, &nlines,
4860 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4861 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4862 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4863 		if (err)
4864 			break;
4865 
4866 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4867 		if (err)
4868 			goto done;
4869 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4870 		/* Show commit info if we're diffing to a parent/root commit. */
4871 		if (s->id1 == NULL) {
4872 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4873 			    refs, s->repo, s->ignore_whitespace,
4874 			    s->force_text_diff, &dsa, s->f);
4875 			if (err)
4876 				goto done;
4877 		} else {
4878 			parent_ids = got_object_commit_get_parent_ids(commit2);
4879 			STAILQ_FOREACH(pid, parent_ids, entry) {
4880 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4881 					err = write_commit_info(&s->lines,
4882 					    &s->nlines, s->id2, refs, s->repo,
4883 					    s->ignore_whitespace,
4884 					    s->force_text_diff, &dsa, s->f);
4885 					if (err)
4886 						goto done;
4887 					break;
4888 				}
4889 			}
4890 		}
4891 		got_object_commit_close(commit2);
4892 
4893 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4894 		    lines, nlines);
4895 		break;
4896 	}
4897 	default:
4898 		err = got_error(GOT_ERR_OBJ_TYPE);
4899 		break;
4900 	}
4901 done:
4902 	free(lines);
4903 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4904 	if (s->f && fflush(s->f) != 0 && err == NULL)
4905 		err = got_error_from_errno("fflush");
4906 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4907 		err = got_error_from_errno("fclose");
4908 	return err;
4909 }
4910 
4911 static void
4912 diff_view_indicate_progress(struct tog_view *view)
4913 {
4914 	mvwaddstr(view->window, 0, 0, "diffing...");
4915 	update_panels();
4916 	doupdate();
4917 }
4918 
4919 static const struct got_error *
4920 search_start_diff_view(struct tog_view *view)
4921 {
4922 	struct tog_diff_view_state *s = &view->state.diff;
4923 
4924 	s->matched_line = 0;
4925 	return NULL;
4926 }
4927 
4928 static void
4929 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4930     size_t *nlines, int **first, int **last, int **match, int **selected)
4931 {
4932 	struct tog_diff_view_state *s = &view->state.diff;
4933 
4934 	*f = s->f;
4935 	*nlines = s->nlines;
4936 	*line_offsets = NULL;
4937 	*match = &s->matched_line;
4938 	*first = &s->first_displayed_line;
4939 	*last = &s->last_displayed_line;
4940 	*selected = &s->selected_line;
4941 }
4942 
4943 static const struct got_error *
4944 search_next_view_match(struct tog_view *view)
4945 {
4946 	const struct got_error *err = NULL;
4947 	FILE *f;
4948 	int lineno;
4949 	char *line = NULL;
4950 	size_t linesize = 0;
4951 	ssize_t linelen;
4952 	off_t *line_offsets;
4953 	size_t nlines = 0;
4954 	int *first, *last, *match, *selected;
4955 
4956 	if (!view->search_setup)
4957 		return got_error_msg(GOT_ERR_NOT_IMPL,
4958 		    "view search not supported");
4959 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4960 	    &match, &selected);
4961 
4962 	if (!view->searching) {
4963 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4964 		return NULL;
4965 	}
4966 
4967 	if (*match) {
4968 		if (view->searching == TOG_SEARCH_FORWARD)
4969 			lineno = *match + 1;
4970 		else
4971 			lineno = *match - 1;
4972 	} else
4973 		lineno = *first - 1 + *selected;
4974 
4975 	while (1) {
4976 		off_t offset;
4977 
4978 		if (lineno <= 0 || lineno > nlines) {
4979 			if (*match == 0) {
4980 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4981 				break;
4982 			}
4983 
4984 			if (view->searching == TOG_SEARCH_FORWARD)
4985 				lineno = 1;
4986 			else
4987 				lineno = nlines;
4988 		}
4989 
4990 		offset = view->type == TOG_VIEW_DIFF ?
4991 		    view->state.diff.lines[lineno - 1].offset :
4992 		    line_offsets[lineno - 1];
4993 		if (fseeko(f, offset, SEEK_SET) != 0) {
4994 			free(line);
4995 			return got_error_from_errno("fseeko");
4996 		}
4997 		linelen = getline(&line, &linesize, f);
4998 		if (linelen != -1) {
4999 			char *exstr;
5000 			err = expand_tab(&exstr, line);
5001 			if (err)
5002 				break;
5003 			if (match_line(exstr, &view->regex, 1,
5004 			    &view->regmatch)) {
5005 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5006 				*match = lineno;
5007 				free(exstr);
5008 				break;
5009 			}
5010 			free(exstr);
5011 		}
5012 		if (view->searching == TOG_SEARCH_FORWARD)
5013 			lineno++;
5014 		else
5015 			lineno--;
5016 	}
5017 	free(line);
5018 
5019 	if (*match) {
5020 		*first = *match;
5021 		*selected = 1;
5022 	}
5023 
5024 	return err;
5025 }
5026 
5027 static const struct got_error *
5028 close_diff_view(struct tog_view *view)
5029 {
5030 	const struct got_error *err = NULL;
5031 	struct tog_diff_view_state *s = &view->state.diff;
5032 
5033 	free(s->id1);
5034 	s->id1 = NULL;
5035 	free(s->id2);
5036 	s->id2 = NULL;
5037 	if (s->f && fclose(s->f) == EOF)
5038 		err = got_error_from_errno("fclose");
5039 	s->f = NULL;
5040 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5041 		err = got_error_from_errno("fclose");
5042 	s->f1 = NULL;
5043 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5044 		err = got_error_from_errno("fclose");
5045 	s->f2 = NULL;
5046 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5047 		err = got_error_from_errno("close");
5048 	s->fd1 = -1;
5049 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5050 		err = got_error_from_errno("close");
5051 	s->fd2 = -1;
5052 	free(s->lines);
5053 	s->lines = NULL;
5054 	s->nlines = 0;
5055 	return err;
5056 }
5057 
5058 static const struct got_error *
5059 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5060     struct got_object_id *id2, const char *label1, const char *label2,
5061     int diff_context, int ignore_whitespace, int force_text_diff,
5062     struct tog_view *parent_view, struct got_repository *repo)
5063 {
5064 	const struct got_error *err;
5065 	struct tog_diff_view_state *s = &view->state.diff;
5066 
5067 	memset(s, 0, sizeof(*s));
5068 	s->fd1 = -1;
5069 	s->fd2 = -1;
5070 
5071 	if (id1 != NULL && id2 != NULL) {
5072 	    int type1, type2;
5073 	    err = got_object_get_type(&type1, repo, id1);
5074 	    if (err)
5075 		return err;
5076 	    err = got_object_get_type(&type2, repo, id2);
5077 	    if (err)
5078 		return err;
5079 
5080 	    if (type1 != type2)
5081 		return got_error(GOT_ERR_OBJ_TYPE);
5082 	}
5083 	s->first_displayed_line = 1;
5084 	s->last_displayed_line = view->nlines;
5085 	s->selected_line = 1;
5086 	s->repo = repo;
5087 	s->id1 = id1;
5088 	s->id2 = id2;
5089 	s->label1 = label1;
5090 	s->label2 = label2;
5091 
5092 	if (id1) {
5093 		s->id1 = got_object_id_dup(id1);
5094 		if (s->id1 == NULL)
5095 			return got_error_from_errno("got_object_id_dup");
5096 	} else
5097 		s->id1 = NULL;
5098 
5099 	s->id2 = got_object_id_dup(id2);
5100 	if (s->id2 == NULL) {
5101 		err = got_error_from_errno("got_object_id_dup");
5102 		goto done;
5103 	}
5104 
5105 	s->f1 = got_opentemp();
5106 	if (s->f1 == NULL) {
5107 		err = got_error_from_errno("got_opentemp");
5108 		goto done;
5109 	}
5110 
5111 	s->f2 = got_opentemp();
5112 	if (s->f2 == NULL) {
5113 		err = got_error_from_errno("got_opentemp");
5114 		goto done;
5115 	}
5116 
5117 	s->fd1 = got_opentempfd();
5118 	if (s->fd1 == -1) {
5119 		err = got_error_from_errno("got_opentempfd");
5120 		goto done;
5121 	}
5122 
5123 	s->fd2 = got_opentempfd();
5124 	if (s->fd2 == -1) {
5125 		err = got_error_from_errno("got_opentempfd");
5126 		goto done;
5127 	}
5128 
5129 	s->diff_context = diff_context;
5130 	s->ignore_whitespace = ignore_whitespace;
5131 	s->force_text_diff = force_text_diff;
5132 	s->parent_view = parent_view;
5133 	s->repo = repo;
5134 
5135 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5136 		int rc;
5137 
5138 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5139 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5140 		if (rc != ERR)
5141 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5142 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5143 		if (rc != ERR)
5144 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5145 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5146 		if (rc != ERR)
5147 			rc = init_pair(GOT_DIFF_LINE_META,
5148 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5149 		if (rc != ERR)
5150 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5151 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5152 		if (rc != ERR)
5153 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5154 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5155 		if (rc != ERR)
5156 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5157 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5158 		if (rc != ERR)
5159 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5160 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5161 		if (rc != ERR)
5162 			rc = init_pair(GOT_DIFF_LINE_DATE,
5163 			    get_color_value("TOG_COLOR_DATE"), -1);
5164 		if (rc == ERR) {
5165 			err = got_error(GOT_ERR_RANGE);
5166 			goto done;
5167 		}
5168 	}
5169 
5170 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5171 	    view_is_splitscreen(view))
5172 		show_log_view(parent_view); /* draw border */
5173 	diff_view_indicate_progress(view);
5174 
5175 	err = create_diff(s);
5176 
5177 	view->show = show_diff_view;
5178 	view->input = input_diff_view;
5179 	view->reset = reset_diff_view;
5180 	view->close = close_diff_view;
5181 	view->search_start = search_start_diff_view;
5182 	view->search_setup = search_setup_diff_view;
5183 	view->search_next = search_next_view_match;
5184 done:
5185 	if (err)
5186 		close_diff_view(view);
5187 	return err;
5188 }
5189 
5190 static const struct got_error *
5191 show_diff_view(struct tog_view *view)
5192 {
5193 	const struct got_error *err;
5194 	struct tog_diff_view_state *s = &view->state.diff;
5195 	char *id_str1 = NULL, *id_str2, *header;
5196 	const char *label1, *label2;
5197 
5198 	if (s->id1) {
5199 		err = got_object_id_str(&id_str1, s->id1);
5200 		if (err)
5201 			return err;
5202 		label1 = s->label1 ? s->label1 : id_str1;
5203 	} else
5204 		label1 = "/dev/null";
5205 
5206 	err = got_object_id_str(&id_str2, s->id2);
5207 	if (err)
5208 		return err;
5209 	label2 = s->label2 ? s->label2 : id_str2;
5210 
5211 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5212 		err = got_error_from_errno("asprintf");
5213 		free(id_str1);
5214 		free(id_str2);
5215 		return err;
5216 	}
5217 	free(id_str1);
5218 	free(id_str2);
5219 
5220 	err = draw_file(view, header);
5221 	free(header);
5222 	return err;
5223 }
5224 
5225 static const struct got_error *
5226 set_selected_commit(struct tog_diff_view_state *s,
5227     struct commit_queue_entry *entry)
5228 {
5229 	const struct got_error *err;
5230 	const struct got_object_id_queue *parent_ids;
5231 	struct got_commit_object *selected_commit;
5232 	struct got_object_qid *pid;
5233 
5234 	free(s->id2);
5235 	s->id2 = got_object_id_dup(entry->id);
5236 	if (s->id2 == NULL)
5237 		return got_error_from_errno("got_object_id_dup");
5238 
5239 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5240 	if (err)
5241 		return err;
5242 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5243 	free(s->id1);
5244 	pid = STAILQ_FIRST(parent_ids);
5245 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5246 	got_object_commit_close(selected_commit);
5247 	return NULL;
5248 }
5249 
5250 static const struct got_error *
5251 reset_diff_view(struct tog_view *view)
5252 {
5253 	struct tog_diff_view_state *s = &view->state.diff;
5254 
5255 	view->count = 0;
5256 	wclear(view->window);
5257 	s->first_displayed_line = 1;
5258 	s->last_displayed_line = view->nlines;
5259 	s->matched_line = 0;
5260 	diff_view_indicate_progress(view);
5261 	return create_diff(s);
5262 }
5263 
5264 static void
5265 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5266 {
5267 	int start, i;
5268 
5269 	i = start = s->first_displayed_line - 1;
5270 
5271 	while (s->lines[i].type != type) {
5272 		if (i == 0)
5273 			i = s->nlines - 1;
5274 		if (--i == start)
5275 			return; /* do nothing, requested type not in file */
5276 	}
5277 
5278 	s->selected_line = 1;
5279 	s->first_displayed_line = i;
5280 }
5281 
5282 static void
5283 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5284 {
5285 	int start, i;
5286 
5287 	i = start = s->first_displayed_line + 1;
5288 
5289 	while (s->lines[i].type != type) {
5290 		if (i == s->nlines - 1)
5291 			i = 0;
5292 		if (++i == start)
5293 			return; /* do nothing, requested type not in file */
5294 	}
5295 
5296 	s->selected_line = 1;
5297 	s->first_displayed_line = i;
5298 }
5299 
5300 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5301     int, int, int);
5302 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5303     int, int);
5304 
5305 static const struct got_error *
5306 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5307 {
5308 	const struct got_error *err = NULL;
5309 	struct tog_diff_view_state *s = &view->state.diff;
5310 	struct tog_log_view_state *ls;
5311 	struct commit_queue_entry *old_selected_entry;
5312 	char *line = NULL;
5313 	size_t linesize = 0;
5314 	ssize_t linelen;
5315 	int i, nscroll = view->nlines - 1, up = 0;
5316 
5317 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5318 
5319 	switch (ch) {
5320 	case '0':
5321 	case '$':
5322 	case KEY_RIGHT:
5323 	case 'l':
5324 	case KEY_LEFT:
5325 	case 'h':
5326 		horizontal_scroll_input(view, ch);
5327 		break;
5328 	case 'a':
5329 	case 'w':
5330 		if (ch == 'a') {
5331 			s->force_text_diff = !s->force_text_diff;
5332 			view->action = s->force_text_diff ?
5333 			    "force ASCII text enabled" :
5334 			    "force ASCII text disabled";
5335 		}
5336 		else if (ch == 'w') {
5337 			s->ignore_whitespace = !s->ignore_whitespace;
5338 			view->action = s->ignore_whitespace ?
5339 			    "ignore whitespace enabled" :
5340 			    "ignore whitespace disabled";
5341 		}
5342 		err = reset_diff_view(view);
5343 		break;
5344 	case 'g':
5345 	case KEY_HOME:
5346 		s->first_displayed_line = 1;
5347 		view->count = 0;
5348 		break;
5349 	case 'G':
5350 	case KEY_END:
5351 		view->count = 0;
5352 		if (s->eof)
5353 			break;
5354 
5355 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5356 		s->eof = 1;
5357 		break;
5358 	case 'k':
5359 	case KEY_UP:
5360 	case CTRL('p'):
5361 		if (s->first_displayed_line > 1)
5362 			s->first_displayed_line--;
5363 		else
5364 			view->count = 0;
5365 		break;
5366 	case CTRL('u'):
5367 	case 'u':
5368 		nscroll /= 2;
5369 		/* FALL THROUGH */
5370 	case KEY_PPAGE:
5371 	case CTRL('b'):
5372 	case 'b':
5373 		if (s->first_displayed_line == 1) {
5374 			view->count = 0;
5375 			break;
5376 		}
5377 		i = 0;
5378 		while (i++ < nscroll && s->first_displayed_line > 1)
5379 			s->first_displayed_line--;
5380 		break;
5381 	case 'j':
5382 	case KEY_DOWN:
5383 	case CTRL('n'):
5384 		if (!s->eof)
5385 			s->first_displayed_line++;
5386 		else
5387 			view->count = 0;
5388 		break;
5389 	case CTRL('d'):
5390 	case 'd':
5391 		nscroll /= 2;
5392 		/* FALL THROUGH */
5393 	case KEY_NPAGE:
5394 	case CTRL('f'):
5395 	case 'f':
5396 	case ' ':
5397 		if (s->eof) {
5398 			view->count = 0;
5399 			break;
5400 		}
5401 		i = 0;
5402 		while (!s->eof && i++ < nscroll) {
5403 			linelen = getline(&line, &linesize, s->f);
5404 			s->first_displayed_line++;
5405 			if (linelen == -1) {
5406 				if (feof(s->f)) {
5407 					s->eof = 1;
5408 				} else
5409 					err = got_ferror(s->f, GOT_ERR_IO);
5410 				break;
5411 			}
5412 		}
5413 		free(line);
5414 		break;
5415 	case '(':
5416 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5417 		break;
5418 	case ')':
5419 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5420 		break;
5421 	case '{':
5422 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5423 		break;
5424 	case '}':
5425 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5426 		break;
5427 	case '[':
5428 		if (s->diff_context > 0) {
5429 			s->diff_context--;
5430 			s->matched_line = 0;
5431 			diff_view_indicate_progress(view);
5432 			err = create_diff(s);
5433 			if (s->first_displayed_line + view->nlines - 1 >
5434 			    s->nlines) {
5435 				s->first_displayed_line = 1;
5436 				s->last_displayed_line = view->nlines;
5437 			}
5438 		} else
5439 			view->count = 0;
5440 		break;
5441 	case ']':
5442 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5443 			s->diff_context++;
5444 			s->matched_line = 0;
5445 			diff_view_indicate_progress(view);
5446 			err = create_diff(s);
5447 		} else
5448 			view->count = 0;
5449 		break;
5450 	case '<':
5451 	case ',':
5452 	case 'K':
5453 		up = 1;
5454 		/* FALL THROUGH */
5455 	case '>':
5456 	case '.':
5457 	case 'J':
5458 		if (s->parent_view == NULL) {
5459 			view->count = 0;
5460 			break;
5461 		}
5462 		s->parent_view->count = view->count;
5463 
5464 		if (s->parent_view->type == TOG_VIEW_LOG) {
5465 			ls = &s->parent_view->state.log;
5466 			old_selected_entry = ls->selected_entry;
5467 
5468 			err = input_log_view(NULL, s->parent_view,
5469 			    up ? KEY_UP : KEY_DOWN);
5470 			if (err)
5471 				break;
5472 			view->count = s->parent_view->count;
5473 
5474 			if (old_selected_entry == ls->selected_entry)
5475 				break;
5476 
5477 			err = set_selected_commit(s, ls->selected_entry);
5478 			if (err)
5479 				break;
5480 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5481 			struct tog_blame_view_state *bs;
5482 			struct got_object_id *id, *prev_id;
5483 
5484 			bs = &s->parent_view->state.blame;
5485 			prev_id = get_annotation_for_line(bs->blame.lines,
5486 			    bs->blame.nlines, bs->last_diffed_line);
5487 
5488 			err = input_blame_view(&view, s->parent_view,
5489 			    up ? KEY_UP : KEY_DOWN);
5490 			if (err)
5491 				break;
5492 			view->count = s->parent_view->count;
5493 
5494 			if (prev_id == NULL)
5495 				break;
5496 			id = get_selected_commit_id(bs->blame.lines,
5497 			    bs->blame.nlines, bs->first_displayed_line,
5498 			    bs->selected_line);
5499 			if (id == NULL)
5500 				break;
5501 
5502 			if (!got_object_id_cmp(prev_id, id))
5503 				break;
5504 
5505 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5506 			if (err)
5507 				break;
5508 		}
5509 		s->first_displayed_line = 1;
5510 		s->last_displayed_line = view->nlines;
5511 		s->matched_line = 0;
5512 		view->x = 0;
5513 
5514 		diff_view_indicate_progress(view);
5515 		err = create_diff(s);
5516 		break;
5517 	default:
5518 		view->count = 0;
5519 		break;
5520 	}
5521 
5522 	return err;
5523 }
5524 
5525 static const struct got_error *
5526 cmd_diff(int argc, char *argv[])
5527 {
5528 	const struct got_error *error = NULL;
5529 	struct got_repository *repo = NULL;
5530 	struct got_worktree *worktree = NULL;
5531 	struct got_object_id *id1 = NULL, *id2 = NULL;
5532 	char *repo_path = NULL, *cwd = NULL;
5533 	char *id_str1 = NULL, *id_str2 = NULL;
5534 	char *label1 = NULL, *label2 = NULL;
5535 	int diff_context = 3, ignore_whitespace = 0;
5536 	int ch, force_text_diff = 0;
5537 	const char *errstr;
5538 	struct tog_view *view;
5539 	int *pack_fds = NULL;
5540 
5541 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5542 		switch (ch) {
5543 		case 'a':
5544 			force_text_diff = 1;
5545 			break;
5546 		case 'C':
5547 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5548 			    &errstr);
5549 			if (errstr != NULL)
5550 				errx(1, "number of context lines is %s: %s",
5551 				    errstr, errstr);
5552 			break;
5553 		case 'r':
5554 			repo_path = realpath(optarg, NULL);
5555 			if (repo_path == NULL)
5556 				return got_error_from_errno2("realpath",
5557 				    optarg);
5558 			got_path_strip_trailing_slashes(repo_path);
5559 			break;
5560 		case 'w':
5561 			ignore_whitespace = 1;
5562 			break;
5563 		default:
5564 			usage_diff();
5565 			/* NOTREACHED */
5566 		}
5567 	}
5568 
5569 	argc -= optind;
5570 	argv += optind;
5571 
5572 	if (argc == 0) {
5573 		usage_diff(); /* TODO show local worktree changes */
5574 	} else if (argc == 2) {
5575 		id_str1 = argv[0];
5576 		id_str2 = argv[1];
5577 	} else
5578 		usage_diff();
5579 
5580 	error = got_repo_pack_fds_open(&pack_fds);
5581 	if (error)
5582 		goto done;
5583 
5584 	if (repo_path == NULL) {
5585 		cwd = getcwd(NULL, 0);
5586 		if (cwd == NULL)
5587 			return got_error_from_errno("getcwd");
5588 		error = got_worktree_open(&worktree, cwd);
5589 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5590 			goto done;
5591 		if (worktree)
5592 			repo_path =
5593 			    strdup(got_worktree_get_repo_path(worktree));
5594 		else
5595 			repo_path = strdup(cwd);
5596 		if (repo_path == NULL) {
5597 			error = got_error_from_errno("strdup");
5598 			goto done;
5599 		}
5600 	}
5601 
5602 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5603 	if (error)
5604 		goto done;
5605 
5606 	init_curses();
5607 
5608 	error = apply_unveil(got_repo_get_path(repo), NULL);
5609 	if (error)
5610 		goto done;
5611 
5612 	error = tog_load_refs(repo, 0);
5613 	if (error)
5614 		goto done;
5615 
5616 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5617 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5618 	if (error)
5619 		goto done;
5620 
5621 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5622 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5623 	if (error)
5624 		goto done;
5625 
5626 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5627 	if (view == NULL) {
5628 		error = got_error_from_errno("view_open");
5629 		goto done;
5630 	}
5631 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5632 	    ignore_whitespace, force_text_diff, NULL,  repo);
5633 	if (error)
5634 		goto done;
5635 	error = view_loop(view);
5636 done:
5637 	free(label1);
5638 	free(label2);
5639 	free(repo_path);
5640 	free(cwd);
5641 	if (repo) {
5642 		const struct got_error *close_err = got_repo_close(repo);
5643 		if (error == NULL)
5644 			error = close_err;
5645 	}
5646 	if (worktree)
5647 		got_worktree_close(worktree);
5648 	if (pack_fds) {
5649 		const struct got_error *pack_err =
5650 		    got_repo_pack_fds_close(pack_fds);
5651 		if (error == NULL)
5652 			error = pack_err;
5653 	}
5654 	tog_free_refs();
5655 	return error;
5656 }
5657 
5658 __dead static void
5659 usage_blame(void)
5660 {
5661 	endwin();
5662 	fprintf(stderr,
5663 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5664 	    getprogname());
5665 	exit(1);
5666 }
5667 
5668 struct tog_blame_line {
5669 	int annotated;
5670 	struct got_object_id *id;
5671 };
5672 
5673 static const struct got_error *
5674 draw_blame(struct tog_view *view)
5675 {
5676 	struct tog_blame_view_state *s = &view->state.blame;
5677 	struct tog_blame *blame = &s->blame;
5678 	regmatch_t *regmatch = &view->regmatch;
5679 	const struct got_error *err;
5680 	int lineno = 0, nprinted = 0;
5681 	char *line = NULL;
5682 	size_t linesize = 0;
5683 	ssize_t linelen;
5684 	wchar_t *wline;
5685 	int width;
5686 	struct tog_blame_line *blame_line;
5687 	struct got_object_id *prev_id = NULL;
5688 	char *id_str;
5689 	struct tog_color *tc;
5690 
5691 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5692 	if (err)
5693 		return err;
5694 
5695 	rewind(blame->f);
5696 	werase(view->window);
5697 
5698 	if (asprintf(&line, "commit %s", id_str) == -1) {
5699 		err = got_error_from_errno("asprintf");
5700 		free(id_str);
5701 		return err;
5702 	}
5703 
5704 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5705 	free(line);
5706 	line = NULL;
5707 	if (err)
5708 		return err;
5709 	if (view_needs_focus_indication(view))
5710 		wstandout(view->window);
5711 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5712 	if (tc)
5713 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5714 	waddwstr(view->window, wline);
5715 	while (width++ < view->ncols)
5716 		waddch(view->window, ' ');
5717 	if (tc)
5718 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5719 	if (view_needs_focus_indication(view))
5720 		wstandend(view->window);
5721 	free(wline);
5722 	wline = NULL;
5723 
5724 	if (view->gline > blame->nlines)
5725 		view->gline = blame->nlines;
5726 
5727 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5728 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5729 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5730 		free(id_str);
5731 		return got_error_from_errno("asprintf");
5732 	}
5733 	free(id_str);
5734 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5735 	free(line);
5736 	line = NULL;
5737 	if (err)
5738 		return err;
5739 	waddwstr(view->window, wline);
5740 	free(wline);
5741 	wline = NULL;
5742 	if (width < view->ncols - 1)
5743 		waddch(view->window, '\n');
5744 
5745 	s->eof = 0;
5746 	view->maxx = 0;
5747 	while (nprinted < view->nlines - 2) {
5748 		linelen = getline(&line, &linesize, blame->f);
5749 		if (linelen == -1) {
5750 			if (feof(blame->f)) {
5751 				s->eof = 1;
5752 				break;
5753 			}
5754 			free(line);
5755 			return got_ferror(blame->f, GOT_ERR_IO);
5756 		}
5757 		if (++lineno < s->first_displayed_line)
5758 			continue;
5759 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5760 			continue;
5761 
5762 		/* Set view->maxx based on full line length. */
5763 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5764 		if (err) {
5765 			free(line);
5766 			return err;
5767 		}
5768 		free(wline);
5769 		wline = NULL;
5770 		view->maxx = MAX(view->maxx, width);
5771 
5772 		if (nprinted == s->selected_line - 1)
5773 			wstandout(view->window);
5774 
5775 		if (blame->nlines > 0) {
5776 			blame_line = &blame->lines[lineno - 1];
5777 			if (blame_line->annotated && prev_id &&
5778 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5779 			    !(nprinted == s->selected_line - 1)) {
5780 				waddstr(view->window, "        ");
5781 			} else if (blame_line->annotated) {
5782 				char *id_str;
5783 				err = got_object_id_str(&id_str,
5784 				    blame_line->id);
5785 				if (err) {
5786 					free(line);
5787 					return err;
5788 				}
5789 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5790 				if (tc)
5791 					wattr_on(view->window,
5792 					    COLOR_PAIR(tc->colorpair), NULL);
5793 				wprintw(view->window, "%.8s", id_str);
5794 				if (tc)
5795 					wattr_off(view->window,
5796 					    COLOR_PAIR(tc->colorpair), NULL);
5797 				free(id_str);
5798 				prev_id = blame_line->id;
5799 			} else {
5800 				waddstr(view->window, "........");
5801 				prev_id = NULL;
5802 			}
5803 		} else {
5804 			waddstr(view->window, "........");
5805 			prev_id = NULL;
5806 		}
5807 
5808 		if (nprinted == s->selected_line - 1)
5809 			wstandend(view->window);
5810 		waddstr(view->window, " ");
5811 
5812 		if (view->ncols <= 9) {
5813 			width = 9;
5814 		} else if (s->first_displayed_line + nprinted ==
5815 		    s->matched_line &&
5816 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5817 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5818 			    view->window, view->x, regmatch);
5819 			if (err) {
5820 				free(line);
5821 				return err;
5822 			}
5823 			width += 9;
5824 		} else {
5825 			int skip;
5826 			err = format_line(&wline, &width, &skip, line,
5827 			    view->x, view->ncols - 9, 9, 1);
5828 			if (err) {
5829 				free(line);
5830 				return err;
5831 			}
5832 			waddwstr(view->window, &wline[skip]);
5833 			width += 9;
5834 			free(wline);
5835 			wline = NULL;
5836 		}
5837 
5838 		if (width <= view->ncols - 1)
5839 			waddch(view->window, '\n');
5840 		if (++nprinted == 1)
5841 			s->first_displayed_line = lineno;
5842 	}
5843 	free(line);
5844 	s->last_displayed_line = lineno;
5845 
5846 	view_border(view);
5847 
5848 	return NULL;
5849 }
5850 
5851 static const struct got_error *
5852 blame_cb(void *arg, int nlines, int lineno,
5853     struct got_commit_object *commit, struct got_object_id *id)
5854 {
5855 	const struct got_error *err = NULL;
5856 	struct tog_blame_cb_args *a = arg;
5857 	struct tog_blame_line *line;
5858 	int errcode;
5859 
5860 	if (nlines != a->nlines ||
5861 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5862 		return got_error(GOT_ERR_RANGE);
5863 
5864 	errcode = pthread_mutex_lock(&tog_mutex);
5865 	if (errcode)
5866 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5867 
5868 	if (*a->quit) {	/* user has quit the blame view */
5869 		err = got_error(GOT_ERR_ITER_COMPLETED);
5870 		goto done;
5871 	}
5872 
5873 	if (lineno == -1)
5874 		goto done; /* no change in this commit */
5875 
5876 	line = &a->lines[lineno - 1];
5877 	if (line->annotated)
5878 		goto done;
5879 
5880 	line->id = got_object_id_dup(id);
5881 	if (line->id == NULL) {
5882 		err = got_error_from_errno("got_object_id_dup");
5883 		goto done;
5884 	}
5885 	line->annotated = 1;
5886 done:
5887 	errcode = pthread_mutex_unlock(&tog_mutex);
5888 	if (errcode)
5889 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5890 	return err;
5891 }
5892 
5893 static void *
5894 blame_thread(void *arg)
5895 {
5896 	const struct got_error *err, *close_err;
5897 	struct tog_blame_thread_args *ta = arg;
5898 	struct tog_blame_cb_args *a = ta->cb_args;
5899 	int errcode, fd1 = -1, fd2 = -1;
5900 	FILE *f1 = NULL, *f2 = NULL;
5901 
5902 	fd1 = got_opentempfd();
5903 	if (fd1 == -1)
5904 		return (void *)got_error_from_errno("got_opentempfd");
5905 
5906 	fd2 = got_opentempfd();
5907 	if (fd2 == -1) {
5908 		err = got_error_from_errno("got_opentempfd");
5909 		goto done;
5910 	}
5911 
5912 	f1 = got_opentemp();
5913 	if (f1 == NULL) {
5914 		err = (void *)got_error_from_errno("got_opentemp");
5915 		goto done;
5916 	}
5917 	f2 = got_opentemp();
5918 	if (f2 == NULL) {
5919 		err = (void *)got_error_from_errno("got_opentemp");
5920 		goto done;
5921 	}
5922 
5923 	err = block_signals_used_by_main_thread();
5924 	if (err)
5925 		goto done;
5926 
5927 	err = got_blame(ta->path, a->commit_id, ta->repo,
5928 	    tog_diff_algo, blame_cb, ta->cb_args,
5929 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5930 	if (err && err->code == GOT_ERR_CANCELLED)
5931 		err = NULL;
5932 
5933 	errcode = pthread_mutex_lock(&tog_mutex);
5934 	if (errcode) {
5935 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5936 		goto done;
5937 	}
5938 
5939 	close_err = got_repo_close(ta->repo);
5940 	if (err == NULL)
5941 		err = close_err;
5942 	ta->repo = NULL;
5943 	*ta->complete = 1;
5944 
5945 	errcode = pthread_mutex_unlock(&tog_mutex);
5946 	if (errcode && err == NULL)
5947 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5948 
5949 done:
5950 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5951 		err = got_error_from_errno("close");
5952 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5953 		err = got_error_from_errno("close");
5954 	if (f1 && fclose(f1) == EOF && err == NULL)
5955 		err = got_error_from_errno("fclose");
5956 	if (f2 && fclose(f2) == EOF && err == NULL)
5957 		err = got_error_from_errno("fclose");
5958 
5959 	return (void *)err;
5960 }
5961 
5962 static struct got_object_id *
5963 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5964     int first_displayed_line, int selected_line)
5965 {
5966 	struct tog_blame_line *line;
5967 
5968 	if (nlines <= 0)
5969 		return NULL;
5970 
5971 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5972 	if (!line->annotated)
5973 		return NULL;
5974 
5975 	return line->id;
5976 }
5977 
5978 static struct got_object_id *
5979 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5980     int lineno)
5981 {
5982 	struct tog_blame_line *line;
5983 
5984 	if (nlines <= 0 || lineno >= nlines)
5985 		return NULL;
5986 
5987 	line = &lines[lineno - 1];
5988 	if (!line->annotated)
5989 		return NULL;
5990 
5991 	return line->id;
5992 }
5993 
5994 static const struct got_error *
5995 stop_blame(struct tog_blame *blame)
5996 {
5997 	const struct got_error *err = NULL;
5998 	int i;
5999 
6000 	if (blame->thread) {
6001 		int errcode;
6002 		errcode = pthread_mutex_unlock(&tog_mutex);
6003 		if (errcode)
6004 			return got_error_set_errno(errcode,
6005 			    "pthread_mutex_unlock");
6006 		errcode = pthread_join(blame->thread, (void **)&err);
6007 		if (errcode)
6008 			return got_error_set_errno(errcode, "pthread_join");
6009 		errcode = pthread_mutex_lock(&tog_mutex);
6010 		if (errcode)
6011 			return got_error_set_errno(errcode,
6012 			    "pthread_mutex_lock");
6013 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6014 			err = NULL;
6015 		blame->thread = NULL;
6016 	}
6017 	if (blame->thread_args.repo) {
6018 		const struct got_error *close_err;
6019 		close_err = got_repo_close(blame->thread_args.repo);
6020 		if (err == NULL)
6021 			err = close_err;
6022 		blame->thread_args.repo = NULL;
6023 	}
6024 	if (blame->f) {
6025 		if (fclose(blame->f) == EOF && err == NULL)
6026 			err = got_error_from_errno("fclose");
6027 		blame->f = NULL;
6028 	}
6029 	if (blame->lines) {
6030 		for (i = 0; i < blame->nlines; i++)
6031 			free(blame->lines[i].id);
6032 		free(blame->lines);
6033 		blame->lines = NULL;
6034 	}
6035 	free(blame->cb_args.commit_id);
6036 	blame->cb_args.commit_id = NULL;
6037 	if (blame->pack_fds) {
6038 		const struct got_error *pack_err =
6039 		    got_repo_pack_fds_close(blame->pack_fds);
6040 		if (err == NULL)
6041 			err = pack_err;
6042 		blame->pack_fds = NULL;
6043 	}
6044 	return err;
6045 }
6046 
6047 static const struct got_error *
6048 cancel_blame_view(void *arg)
6049 {
6050 	const struct got_error *err = NULL;
6051 	int *done = arg;
6052 	int errcode;
6053 
6054 	errcode = pthread_mutex_lock(&tog_mutex);
6055 	if (errcode)
6056 		return got_error_set_errno(errcode,
6057 		    "pthread_mutex_unlock");
6058 
6059 	if (*done)
6060 		err = got_error(GOT_ERR_CANCELLED);
6061 
6062 	errcode = pthread_mutex_unlock(&tog_mutex);
6063 	if (errcode)
6064 		return got_error_set_errno(errcode,
6065 		    "pthread_mutex_lock");
6066 
6067 	return err;
6068 }
6069 
6070 static const struct got_error *
6071 run_blame(struct tog_view *view)
6072 {
6073 	struct tog_blame_view_state *s = &view->state.blame;
6074 	struct tog_blame *blame = &s->blame;
6075 	const struct got_error *err = NULL;
6076 	struct got_commit_object *commit = NULL;
6077 	struct got_blob_object *blob = NULL;
6078 	struct got_repository *thread_repo = NULL;
6079 	struct got_object_id *obj_id = NULL;
6080 	int obj_type, fd = -1;
6081 	int *pack_fds = NULL;
6082 
6083 	err = got_object_open_as_commit(&commit, s->repo,
6084 	    &s->blamed_commit->id);
6085 	if (err)
6086 		return err;
6087 
6088 	fd = got_opentempfd();
6089 	if (fd == -1) {
6090 		err = got_error_from_errno("got_opentempfd");
6091 		goto done;
6092 	}
6093 
6094 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6095 	if (err)
6096 		goto done;
6097 
6098 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6099 	if (err)
6100 		goto done;
6101 
6102 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6103 		err = got_error(GOT_ERR_OBJ_TYPE);
6104 		goto done;
6105 	}
6106 
6107 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6108 	if (err)
6109 		goto done;
6110 	blame->f = got_opentemp();
6111 	if (blame->f == NULL) {
6112 		err = got_error_from_errno("got_opentemp");
6113 		goto done;
6114 	}
6115 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6116 	    &blame->line_offsets, blame->f, blob);
6117 	if (err)
6118 		goto done;
6119 	if (blame->nlines == 0) {
6120 		s->blame_complete = 1;
6121 		goto done;
6122 	}
6123 
6124 	/* Don't include \n at EOF in the blame line count. */
6125 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6126 		blame->nlines--;
6127 
6128 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6129 	if (blame->lines == NULL) {
6130 		err = got_error_from_errno("calloc");
6131 		goto done;
6132 	}
6133 
6134 	err = got_repo_pack_fds_open(&pack_fds);
6135 	if (err)
6136 		goto done;
6137 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6138 	    pack_fds);
6139 	if (err)
6140 		goto done;
6141 
6142 	blame->pack_fds = pack_fds;
6143 	blame->cb_args.view = view;
6144 	blame->cb_args.lines = blame->lines;
6145 	blame->cb_args.nlines = blame->nlines;
6146 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6147 	if (blame->cb_args.commit_id == NULL) {
6148 		err = got_error_from_errno("got_object_id_dup");
6149 		goto done;
6150 	}
6151 	blame->cb_args.quit = &s->done;
6152 
6153 	blame->thread_args.path = s->path;
6154 	blame->thread_args.repo = thread_repo;
6155 	blame->thread_args.cb_args = &blame->cb_args;
6156 	blame->thread_args.complete = &s->blame_complete;
6157 	blame->thread_args.cancel_cb = cancel_blame_view;
6158 	blame->thread_args.cancel_arg = &s->done;
6159 	s->blame_complete = 0;
6160 
6161 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6162 		s->first_displayed_line = 1;
6163 		s->last_displayed_line = view->nlines;
6164 		s->selected_line = 1;
6165 	}
6166 	s->matched_line = 0;
6167 
6168 done:
6169 	if (commit)
6170 		got_object_commit_close(commit);
6171 	if (fd != -1 && close(fd) == -1 && err == NULL)
6172 		err = got_error_from_errno("close");
6173 	if (blob)
6174 		got_object_blob_close(blob);
6175 	free(obj_id);
6176 	if (err)
6177 		stop_blame(blame);
6178 	return err;
6179 }
6180 
6181 static const struct got_error *
6182 open_blame_view(struct tog_view *view, char *path,
6183     struct got_object_id *commit_id, struct got_repository *repo)
6184 {
6185 	const struct got_error *err = NULL;
6186 	struct tog_blame_view_state *s = &view->state.blame;
6187 
6188 	STAILQ_INIT(&s->blamed_commits);
6189 
6190 	s->path = strdup(path);
6191 	if (s->path == NULL)
6192 		return got_error_from_errno("strdup");
6193 
6194 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6195 	if (err) {
6196 		free(s->path);
6197 		return err;
6198 	}
6199 
6200 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6201 	s->first_displayed_line = 1;
6202 	s->last_displayed_line = view->nlines;
6203 	s->selected_line = 1;
6204 	s->blame_complete = 0;
6205 	s->repo = repo;
6206 	s->commit_id = commit_id;
6207 	memset(&s->blame, 0, sizeof(s->blame));
6208 
6209 	STAILQ_INIT(&s->colors);
6210 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6211 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6212 		    get_color_value("TOG_COLOR_COMMIT"));
6213 		if (err)
6214 			return err;
6215 	}
6216 
6217 	view->show = show_blame_view;
6218 	view->input = input_blame_view;
6219 	view->reset = reset_blame_view;
6220 	view->close = close_blame_view;
6221 	view->search_start = search_start_blame_view;
6222 	view->search_setup = search_setup_blame_view;
6223 	view->search_next = search_next_view_match;
6224 
6225 	return run_blame(view);
6226 }
6227 
6228 static const struct got_error *
6229 close_blame_view(struct tog_view *view)
6230 {
6231 	const struct got_error *err = NULL;
6232 	struct tog_blame_view_state *s = &view->state.blame;
6233 
6234 	if (s->blame.thread)
6235 		err = stop_blame(&s->blame);
6236 
6237 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6238 		struct got_object_qid *blamed_commit;
6239 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6240 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6241 		got_object_qid_free(blamed_commit);
6242 	}
6243 
6244 	free(s->path);
6245 	free_colors(&s->colors);
6246 	return err;
6247 }
6248 
6249 static const struct got_error *
6250 search_start_blame_view(struct tog_view *view)
6251 {
6252 	struct tog_blame_view_state *s = &view->state.blame;
6253 
6254 	s->matched_line = 0;
6255 	return NULL;
6256 }
6257 
6258 static void
6259 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6260     size_t *nlines, int **first, int **last, int **match, int **selected)
6261 {
6262 	struct tog_blame_view_state *s = &view->state.blame;
6263 
6264 	*f = s->blame.f;
6265 	*nlines = s->blame.nlines;
6266 	*line_offsets = s->blame.line_offsets;
6267 	*match = &s->matched_line;
6268 	*first = &s->first_displayed_line;
6269 	*last = &s->last_displayed_line;
6270 	*selected = &s->selected_line;
6271 }
6272 
6273 static const struct got_error *
6274 show_blame_view(struct tog_view *view)
6275 {
6276 	const struct got_error *err = NULL;
6277 	struct tog_blame_view_state *s = &view->state.blame;
6278 	int errcode;
6279 
6280 	if (s->blame.thread == NULL && !s->blame_complete) {
6281 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6282 		    &s->blame.thread_args);
6283 		if (errcode)
6284 			return got_error_set_errno(errcode, "pthread_create");
6285 
6286 		halfdelay(1); /* fast refresh while annotating  */
6287 	}
6288 
6289 	if (s->blame_complete)
6290 		halfdelay(10); /* disable fast refresh */
6291 
6292 	err = draw_blame(view);
6293 
6294 	view_border(view);
6295 	return err;
6296 }
6297 
6298 static const struct got_error *
6299 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6300     struct got_repository *repo, struct got_object_id *id)
6301 {
6302 	struct tog_view		*log_view;
6303 	const struct got_error	*err = NULL;
6304 
6305 	*new_view = NULL;
6306 
6307 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6308 	if (log_view == NULL)
6309 		return got_error_from_errno("view_open");
6310 
6311 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6312 	if (err)
6313 		view_close(log_view);
6314 	else
6315 		*new_view = log_view;
6316 
6317 	return err;
6318 }
6319 
6320 static const struct got_error *
6321 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6322 {
6323 	const struct got_error *err = NULL, *thread_err = NULL;
6324 	struct tog_view *diff_view;
6325 	struct tog_blame_view_state *s = &view->state.blame;
6326 	int eos, nscroll, begin_y = 0, begin_x = 0;
6327 
6328 	eos = nscroll = view->nlines - 2;
6329 	if (view_is_hsplit_top(view))
6330 		--eos;  /* border */
6331 
6332 	switch (ch) {
6333 	case '0':
6334 	case '$':
6335 	case KEY_RIGHT:
6336 	case 'l':
6337 	case KEY_LEFT:
6338 	case 'h':
6339 		horizontal_scroll_input(view, ch);
6340 		break;
6341 	case 'q':
6342 		s->done = 1;
6343 		break;
6344 	case 'g':
6345 	case KEY_HOME:
6346 		s->selected_line = 1;
6347 		s->first_displayed_line = 1;
6348 		view->count = 0;
6349 		break;
6350 	case 'G':
6351 	case KEY_END:
6352 		if (s->blame.nlines < eos) {
6353 			s->selected_line = s->blame.nlines;
6354 			s->first_displayed_line = 1;
6355 		} else {
6356 			s->selected_line = eos;
6357 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6358 		}
6359 		view->count = 0;
6360 		break;
6361 	case 'k':
6362 	case KEY_UP:
6363 	case CTRL('p'):
6364 		if (s->selected_line > 1)
6365 			s->selected_line--;
6366 		else if (s->selected_line == 1 &&
6367 		    s->first_displayed_line > 1)
6368 			s->first_displayed_line--;
6369 		else
6370 			view->count = 0;
6371 		break;
6372 	case CTRL('u'):
6373 	case 'u':
6374 		nscroll /= 2;
6375 		/* FALL THROUGH */
6376 	case KEY_PPAGE:
6377 	case CTRL('b'):
6378 	case 'b':
6379 		if (s->first_displayed_line == 1) {
6380 			if (view->count > 1)
6381 				nscroll += nscroll;
6382 			s->selected_line = MAX(1, s->selected_line - nscroll);
6383 			view->count = 0;
6384 			break;
6385 		}
6386 		if (s->first_displayed_line > nscroll)
6387 			s->first_displayed_line -= nscroll;
6388 		else
6389 			s->first_displayed_line = 1;
6390 		break;
6391 	case 'j':
6392 	case KEY_DOWN:
6393 	case CTRL('n'):
6394 		if (s->selected_line < eos && s->first_displayed_line +
6395 		    s->selected_line <= s->blame.nlines)
6396 			s->selected_line++;
6397 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6398 			s->first_displayed_line++;
6399 		else
6400 			view->count = 0;
6401 		break;
6402 	case 'c':
6403 	case 'p': {
6404 		struct got_object_id *id = NULL;
6405 
6406 		view->count = 0;
6407 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6408 		    s->first_displayed_line, s->selected_line);
6409 		if (id == NULL)
6410 			break;
6411 		if (ch == 'p') {
6412 			struct got_commit_object *commit, *pcommit;
6413 			struct got_object_qid *pid;
6414 			struct got_object_id *blob_id = NULL;
6415 			int obj_type;
6416 			err = got_object_open_as_commit(&commit,
6417 			    s->repo, id);
6418 			if (err)
6419 				break;
6420 			pid = STAILQ_FIRST(
6421 			    got_object_commit_get_parent_ids(commit));
6422 			if (pid == NULL) {
6423 				got_object_commit_close(commit);
6424 				break;
6425 			}
6426 			/* Check if path history ends here. */
6427 			err = got_object_open_as_commit(&pcommit,
6428 			    s->repo, &pid->id);
6429 			if (err)
6430 				break;
6431 			err = got_object_id_by_path(&blob_id, s->repo,
6432 			    pcommit, s->path);
6433 			got_object_commit_close(pcommit);
6434 			if (err) {
6435 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6436 					err = NULL;
6437 				got_object_commit_close(commit);
6438 				break;
6439 			}
6440 			err = got_object_get_type(&obj_type, s->repo,
6441 			    blob_id);
6442 			free(blob_id);
6443 			/* Can't blame non-blob type objects. */
6444 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6445 				got_object_commit_close(commit);
6446 				break;
6447 			}
6448 			err = got_object_qid_alloc(&s->blamed_commit,
6449 			    &pid->id);
6450 			got_object_commit_close(commit);
6451 		} else {
6452 			if (got_object_id_cmp(id,
6453 			    &s->blamed_commit->id) == 0)
6454 				break;
6455 			err = got_object_qid_alloc(&s->blamed_commit,
6456 			    id);
6457 		}
6458 		if (err)
6459 			break;
6460 		s->done = 1;
6461 		thread_err = stop_blame(&s->blame);
6462 		s->done = 0;
6463 		if (thread_err)
6464 			break;
6465 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6466 		    s->blamed_commit, entry);
6467 		err = run_blame(view);
6468 		if (err)
6469 			break;
6470 		break;
6471 	}
6472 	case 'C': {
6473 		struct got_object_qid *first;
6474 
6475 		view->count = 0;
6476 		first = STAILQ_FIRST(&s->blamed_commits);
6477 		if (!got_object_id_cmp(&first->id, s->commit_id))
6478 			break;
6479 		s->done = 1;
6480 		thread_err = stop_blame(&s->blame);
6481 		s->done = 0;
6482 		if (thread_err)
6483 			break;
6484 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6485 		got_object_qid_free(s->blamed_commit);
6486 		s->blamed_commit =
6487 		    STAILQ_FIRST(&s->blamed_commits);
6488 		err = run_blame(view);
6489 		if (err)
6490 			break;
6491 		break;
6492 	}
6493 	case 'L':
6494 		view->count = 0;
6495 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6496 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6497 		if (s->id_to_log)
6498 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6499 		break;
6500 	case KEY_ENTER:
6501 	case '\r': {
6502 		struct got_object_id *id = NULL;
6503 		struct got_object_qid *pid;
6504 		struct got_commit_object *commit = NULL;
6505 
6506 		view->count = 0;
6507 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6508 		    s->first_displayed_line, s->selected_line);
6509 		if (id == NULL)
6510 			break;
6511 		err = got_object_open_as_commit(&commit, s->repo, id);
6512 		if (err)
6513 			break;
6514 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6515 		if (*new_view) {
6516 			/* traversed from diff view, release diff resources  */
6517 			err = close_diff_view(*new_view);
6518 			if (err)
6519 				break;
6520 			diff_view = *new_view;
6521 		} else {
6522 			if (view_is_parent_view(view))
6523 				view_get_split(view, &begin_y, &begin_x);
6524 
6525 			diff_view = view_open(0, 0, begin_y, begin_x,
6526 			    TOG_VIEW_DIFF);
6527 			if (diff_view == NULL) {
6528 				got_object_commit_close(commit);
6529 				err = got_error_from_errno("view_open");
6530 				break;
6531 			}
6532 		}
6533 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6534 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6535 		got_object_commit_close(commit);
6536 		if (err) {
6537 			view_close(diff_view);
6538 			break;
6539 		}
6540 		s->last_diffed_line = s->first_displayed_line - 1 +
6541 		    s->selected_line;
6542 		if (*new_view)
6543 			break;	/* still open from active diff view */
6544 		if (view_is_parent_view(view) &&
6545 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6546 			err = view_init_hsplit(view, begin_y);
6547 			if (err)
6548 				break;
6549 		}
6550 
6551 		view->focussed = 0;
6552 		diff_view->focussed = 1;
6553 		diff_view->mode = view->mode;
6554 		diff_view->nlines = view->lines - begin_y;
6555 		if (view_is_parent_view(view)) {
6556 			view_transfer_size(diff_view, view);
6557 			err = view_close_child(view);
6558 			if (err)
6559 				break;
6560 			err = view_set_child(view, diff_view);
6561 			if (err)
6562 				break;
6563 			view->focus_child = 1;
6564 		} else
6565 			*new_view = diff_view;
6566 		if (err)
6567 			break;
6568 		break;
6569 	}
6570 	case CTRL('d'):
6571 	case 'd':
6572 		nscroll /= 2;
6573 		/* FALL THROUGH */
6574 	case KEY_NPAGE:
6575 	case CTRL('f'):
6576 	case 'f':
6577 	case ' ':
6578 		if (s->last_displayed_line >= s->blame.nlines &&
6579 		    s->selected_line >= MIN(s->blame.nlines,
6580 		    view->nlines - 2)) {
6581 			view->count = 0;
6582 			break;
6583 		}
6584 		if (s->last_displayed_line >= s->blame.nlines &&
6585 		    s->selected_line < view->nlines - 2) {
6586 			s->selected_line +=
6587 			    MIN(nscroll, s->last_displayed_line -
6588 			    s->first_displayed_line - s->selected_line + 1);
6589 		}
6590 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6591 			s->first_displayed_line += nscroll;
6592 		else
6593 			s->first_displayed_line =
6594 			    s->blame.nlines - (view->nlines - 3);
6595 		break;
6596 	case KEY_RESIZE:
6597 		if (s->selected_line > view->nlines - 2) {
6598 			s->selected_line = MIN(s->blame.nlines,
6599 			    view->nlines - 2);
6600 		}
6601 		break;
6602 	default:
6603 		view->count = 0;
6604 		break;
6605 	}
6606 	return thread_err ? thread_err : err;
6607 }
6608 
6609 static const struct got_error *
6610 reset_blame_view(struct tog_view *view)
6611 {
6612 	const struct got_error *err;
6613 	struct tog_blame_view_state *s = &view->state.blame;
6614 
6615 	view->count = 0;
6616 	s->done = 1;
6617 	err = stop_blame(&s->blame);
6618 	s->done = 0;
6619 	if (err)
6620 		return err;
6621 	return run_blame(view);
6622 }
6623 
6624 static const struct got_error *
6625 cmd_blame(int argc, char *argv[])
6626 {
6627 	const struct got_error *error;
6628 	struct got_repository *repo = NULL;
6629 	struct got_worktree *worktree = NULL;
6630 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6631 	char *link_target = NULL;
6632 	struct got_object_id *commit_id = NULL;
6633 	struct got_commit_object *commit = NULL;
6634 	char *commit_id_str = NULL;
6635 	int ch;
6636 	struct tog_view *view;
6637 	int *pack_fds = NULL;
6638 
6639 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6640 		switch (ch) {
6641 		case 'c':
6642 			commit_id_str = optarg;
6643 			break;
6644 		case 'r':
6645 			repo_path = realpath(optarg, NULL);
6646 			if (repo_path == NULL)
6647 				return got_error_from_errno2("realpath",
6648 				    optarg);
6649 			break;
6650 		default:
6651 			usage_blame();
6652 			/* NOTREACHED */
6653 		}
6654 	}
6655 
6656 	argc -= optind;
6657 	argv += optind;
6658 
6659 	if (argc != 1)
6660 		usage_blame();
6661 
6662 	error = got_repo_pack_fds_open(&pack_fds);
6663 	if (error != NULL)
6664 		goto done;
6665 
6666 	if (repo_path == NULL) {
6667 		cwd = getcwd(NULL, 0);
6668 		if (cwd == NULL)
6669 			return got_error_from_errno("getcwd");
6670 		error = got_worktree_open(&worktree, cwd);
6671 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6672 			goto done;
6673 		if (worktree)
6674 			repo_path =
6675 			    strdup(got_worktree_get_repo_path(worktree));
6676 		else
6677 			repo_path = strdup(cwd);
6678 		if (repo_path == NULL) {
6679 			error = got_error_from_errno("strdup");
6680 			goto done;
6681 		}
6682 	}
6683 
6684 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6685 	if (error != NULL)
6686 		goto done;
6687 
6688 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6689 	    worktree);
6690 	if (error)
6691 		goto done;
6692 
6693 	init_curses();
6694 
6695 	error = apply_unveil(got_repo_get_path(repo), NULL);
6696 	if (error)
6697 		goto done;
6698 
6699 	error = tog_load_refs(repo, 0);
6700 	if (error)
6701 		goto done;
6702 
6703 	if (commit_id_str == NULL) {
6704 		struct got_reference *head_ref;
6705 		error = got_ref_open(&head_ref, repo, worktree ?
6706 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6707 		if (error != NULL)
6708 			goto done;
6709 		error = got_ref_resolve(&commit_id, repo, head_ref);
6710 		got_ref_close(head_ref);
6711 	} else {
6712 		error = got_repo_match_object_id(&commit_id, NULL,
6713 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6714 	}
6715 	if (error != NULL)
6716 		goto done;
6717 
6718 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6719 	if (view == NULL) {
6720 		error = got_error_from_errno("view_open");
6721 		goto done;
6722 	}
6723 
6724 	error = got_object_open_as_commit(&commit, repo, commit_id);
6725 	if (error)
6726 		goto done;
6727 
6728 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6729 	    commit, repo);
6730 	if (error)
6731 		goto done;
6732 
6733 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6734 	    commit_id, repo);
6735 	if (error)
6736 		goto done;
6737 	if (worktree) {
6738 		/* Release work tree lock. */
6739 		got_worktree_close(worktree);
6740 		worktree = NULL;
6741 	}
6742 	error = view_loop(view);
6743 done:
6744 	free(repo_path);
6745 	free(in_repo_path);
6746 	free(link_target);
6747 	free(cwd);
6748 	free(commit_id);
6749 	if (commit)
6750 		got_object_commit_close(commit);
6751 	if (worktree)
6752 		got_worktree_close(worktree);
6753 	if (repo) {
6754 		const struct got_error *close_err = got_repo_close(repo);
6755 		if (error == NULL)
6756 			error = close_err;
6757 	}
6758 	if (pack_fds) {
6759 		const struct got_error *pack_err =
6760 		    got_repo_pack_fds_close(pack_fds);
6761 		if (error == NULL)
6762 			error = pack_err;
6763 	}
6764 	tog_free_refs();
6765 	return error;
6766 }
6767 
6768 static const struct got_error *
6769 draw_tree_entries(struct tog_view *view, const char *parent_path)
6770 {
6771 	struct tog_tree_view_state *s = &view->state.tree;
6772 	const struct got_error *err = NULL;
6773 	struct got_tree_entry *te;
6774 	wchar_t *wline;
6775 	char *index = NULL;
6776 	struct tog_color *tc;
6777 	int width, n, nentries, scrollx, i = 1;
6778 	int limit = view->nlines;
6779 
6780 	s->ndisplayed = 0;
6781 	if (view_is_hsplit_top(view))
6782 		--limit;  /* border */
6783 
6784 	werase(view->window);
6785 
6786 	if (limit == 0)
6787 		return NULL;
6788 
6789 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6790 	    0, 0);
6791 	if (err)
6792 		return err;
6793 	if (view_needs_focus_indication(view))
6794 		wstandout(view->window);
6795 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6796 	if (tc)
6797 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6798 	waddwstr(view->window, wline);
6799 	free(wline);
6800 	wline = NULL;
6801 	while (width++ < view->ncols)
6802 		waddch(view->window, ' ');
6803 	if (tc)
6804 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6805 	if (view_needs_focus_indication(view))
6806 		wstandend(view->window);
6807 	if (--limit <= 0)
6808 		return NULL;
6809 
6810 	i += s->selected;
6811 	if (s->first_displayed_entry) {
6812 		i += got_tree_entry_get_index(s->first_displayed_entry);
6813 		if (s->tree != s->root)
6814 			++i;  /* account for ".." entry */
6815 	}
6816 	nentries = got_object_tree_get_nentries(s->tree);
6817 	if (asprintf(&index, "[%d/%d] %s",
6818 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6819 		return got_error_from_errno("asprintf");
6820 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6821 	free(index);
6822 	if (err)
6823 		return err;
6824 	waddwstr(view->window, wline);
6825 	free(wline);
6826 	wline = NULL;
6827 	if (width < view->ncols - 1)
6828 		waddch(view->window, '\n');
6829 	if (--limit <= 0)
6830 		return NULL;
6831 	waddch(view->window, '\n');
6832 	if (--limit <= 0)
6833 		return NULL;
6834 
6835 	if (s->first_displayed_entry == NULL) {
6836 		te = got_object_tree_get_first_entry(s->tree);
6837 		if (s->selected == 0) {
6838 			if (view->focussed)
6839 				wstandout(view->window);
6840 			s->selected_entry = NULL;
6841 		}
6842 		waddstr(view->window, "  ..\n");	/* parent directory */
6843 		if (s->selected == 0 && view->focussed)
6844 			wstandend(view->window);
6845 		s->ndisplayed++;
6846 		if (--limit <= 0)
6847 			return NULL;
6848 		n = 1;
6849 	} else {
6850 		n = 0;
6851 		te = s->first_displayed_entry;
6852 	}
6853 
6854 	view->maxx = 0;
6855 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6856 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6857 		const char *modestr = "";
6858 		mode_t mode;
6859 
6860 		te = got_object_tree_get_entry(s->tree, i);
6861 		mode = got_tree_entry_get_mode(te);
6862 
6863 		if (s->show_ids) {
6864 			err = got_object_id_str(&id_str,
6865 			    got_tree_entry_get_id(te));
6866 			if (err)
6867 				return got_error_from_errno(
6868 				    "got_object_id_str");
6869 		}
6870 		if (got_object_tree_entry_is_submodule(te))
6871 			modestr = "$";
6872 		else if (S_ISLNK(mode)) {
6873 			int i;
6874 
6875 			err = got_tree_entry_get_symlink_target(&link_target,
6876 			    te, s->repo);
6877 			if (err) {
6878 				free(id_str);
6879 				return err;
6880 			}
6881 			for (i = 0; i < strlen(link_target); i++) {
6882 				if (!isprint((unsigned char)link_target[i]))
6883 					link_target[i] = '?';
6884 			}
6885 			modestr = "@";
6886 		}
6887 		else if (S_ISDIR(mode))
6888 			modestr = "/";
6889 		else if (mode & S_IXUSR)
6890 			modestr = "*";
6891 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6892 		    got_tree_entry_get_name(te), modestr,
6893 		    link_target ? " -> ": "",
6894 		    link_target ? link_target : "") == -1) {
6895 			free(id_str);
6896 			free(link_target);
6897 			return got_error_from_errno("asprintf");
6898 		}
6899 		free(id_str);
6900 		free(link_target);
6901 
6902 		/* use full line width to determine view->maxx */
6903 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6904 		if (err) {
6905 			free(line);
6906 			break;
6907 		}
6908 		view->maxx = MAX(view->maxx, width);
6909 		free(wline);
6910 		wline = NULL;
6911 
6912 		err = format_line(&wline, &width, &scrollx, line, view->x,
6913 		    view->ncols, 0, 0);
6914 		if (err) {
6915 			free(line);
6916 			break;
6917 		}
6918 		if (n == s->selected) {
6919 			if (view->focussed)
6920 				wstandout(view->window);
6921 			s->selected_entry = te;
6922 		}
6923 		tc = match_color(&s->colors, line);
6924 		if (tc)
6925 			wattr_on(view->window,
6926 			    COLOR_PAIR(tc->colorpair), NULL);
6927 		waddwstr(view->window, &wline[scrollx]);
6928 		if (tc)
6929 			wattr_off(view->window,
6930 			    COLOR_PAIR(tc->colorpair), NULL);
6931 		if (width < view->ncols)
6932 			waddch(view->window, '\n');
6933 		if (n == s->selected && view->focussed)
6934 			wstandend(view->window);
6935 		free(line);
6936 		free(wline);
6937 		wline = NULL;
6938 		n++;
6939 		s->ndisplayed++;
6940 		s->last_displayed_entry = te;
6941 		if (--limit <= 0)
6942 			break;
6943 	}
6944 
6945 	return err;
6946 }
6947 
6948 static void
6949 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6950 {
6951 	struct got_tree_entry *te;
6952 	int isroot = s->tree == s->root;
6953 	int i = 0;
6954 
6955 	if (s->first_displayed_entry == NULL)
6956 		return;
6957 
6958 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6959 	while (i++ < maxscroll) {
6960 		if (te == NULL) {
6961 			if (!isroot)
6962 				s->first_displayed_entry = NULL;
6963 			break;
6964 		}
6965 		s->first_displayed_entry = te;
6966 		te = got_tree_entry_get_prev(s->tree, te);
6967 	}
6968 }
6969 
6970 static const struct got_error *
6971 tree_scroll_down(struct tog_view *view, int maxscroll)
6972 {
6973 	struct tog_tree_view_state *s = &view->state.tree;
6974 	struct got_tree_entry *next, *last;
6975 	int n = 0;
6976 
6977 	if (s->first_displayed_entry)
6978 		next = got_tree_entry_get_next(s->tree,
6979 		    s->first_displayed_entry);
6980 	else
6981 		next = got_object_tree_get_first_entry(s->tree);
6982 
6983 	last = s->last_displayed_entry;
6984 	while (next && n++ < maxscroll) {
6985 		if (last) {
6986 			s->last_displayed_entry = last;
6987 			last = got_tree_entry_get_next(s->tree, last);
6988 		}
6989 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6990 			s->first_displayed_entry = next;
6991 			next = got_tree_entry_get_next(s->tree, next);
6992 		}
6993 	}
6994 
6995 	return NULL;
6996 }
6997 
6998 static const struct got_error *
6999 tree_entry_path(char **path, struct tog_parent_trees *parents,
7000     struct got_tree_entry *te)
7001 {
7002 	const struct got_error *err = NULL;
7003 	struct tog_parent_tree *pt;
7004 	size_t len = 2; /* for leading slash and NUL */
7005 
7006 	TAILQ_FOREACH(pt, parents, entry)
7007 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7008 		    + 1 /* slash */;
7009 	if (te)
7010 		len += strlen(got_tree_entry_get_name(te));
7011 
7012 	*path = calloc(1, len);
7013 	if (path == NULL)
7014 		return got_error_from_errno("calloc");
7015 
7016 	(*path)[0] = '/';
7017 	pt = TAILQ_LAST(parents, tog_parent_trees);
7018 	while (pt) {
7019 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7020 		if (strlcat(*path, name, len) >= len) {
7021 			err = got_error(GOT_ERR_NO_SPACE);
7022 			goto done;
7023 		}
7024 		if (strlcat(*path, "/", len) >= len) {
7025 			err = got_error(GOT_ERR_NO_SPACE);
7026 			goto done;
7027 		}
7028 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7029 	}
7030 	if (te) {
7031 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7032 			err = got_error(GOT_ERR_NO_SPACE);
7033 			goto done;
7034 		}
7035 	}
7036 done:
7037 	if (err) {
7038 		free(*path);
7039 		*path = NULL;
7040 	}
7041 	return err;
7042 }
7043 
7044 static const struct got_error *
7045 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7046     struct got_tree_entry *te, struct tog_parent_trees *parents,
7047     struct got_object_id *commit_id, struct got_repository *repo)
7048 {
7049 	const struct got_error *err = NULL;
7050 	char *path;
7051 	struct tog_view *blame_view;
7052 
7053 	*new_view = NULL;
7054 
7055 	err = tree_entry_path(&path, parents, te);
7056 	if (err)
7057 		return err;
7058 
7059 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7060 	if (blame_view == NULL) {
7061 		err = got_error_from_errno("view_open");
7062 		goto done;
7063 	}
7064 
7065 	err = open_blame_view(blame_view, path, commit_id, repo);
7066 	if (err) {
7067 		if (err->code == GOT_ERR_CANCELLED)
7068 			err = NULL;
7069 		view_close(blame_view);
7070 	} else
7071 		*new_view = blame_view;
7072 done:
7073 	free(path);
7074 	return err;
7075 }
7076 
7077 static const struct got_error *
7078 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7079     struct tog_tree_view_state *s)
7080 {
7081 	struct tog_view *log_view;
7082 	const struct got_error *err = NULL;
7083 	char *path;
7084 
7085 	*new_view = NULL;
7086 
7087 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7088 	if (log_view == NULL)
7089 		return got_error_from_errno("view_open");
7090 
7091 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7092 	if (err)
7093 		return err;
7094 
7095 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7096 	    path, 0);
7097 	if (err)
7098 		view_close(log_view);
7099 	else
7100 		*new_view = log_view;
7101 	free(path);
7102 	return err;
7103 }
7104 
7105 static const struct got_error *
7106 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7107     const char *head_ref_name, struct got_repository *repo)
7108 {
7109 	const struct got_error *err = NULL;
7110 	char *commit_id_str = NULL;
7111 	struct tog_tree_view_state *s = &view->state.tree;
7112 	struct got_commit_object *commit = NULL;
7113 
7114 	TAILQ_INIT(&s->parents);
7115 	STAILQ_INIT(&s->colors);
7116 
7117 	s->commit_id = got_object_id_dup(commit_id);
7118 	if (s->commit_id == NULL)
7119 		return got_error_from_errno("got_object_id_dup");
7120 
7121 	err = got_object_open_as_commit(&commit, repo, commit_id);
7122 	if (err)
7123 		goto done;
7124 
7125 	/*
7126 	 * The root is opened here and will be closed when the view is closed.
7127 	 * Any visited subtrees and their path-wise parents are opened and
7128 	 * closed on demand.
7129 	 */
7130 	err = got_object_open_as_tree(&s->root, repo,
7131 	    got_object_commit_get_tree_id(commit));
7132 	if (err)
7133 		goto done;
7134 	s->tree = s->root;
7135 
7136 	err = got_object_id_str(&commit_id_str, commit_id);
7137 	if (err != NULL)
7138 		goto done;
7139 
7140 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7141 		err = got_error_from_errno("asprintf");
7142 		goto done;
7143 	}
7144 
7145 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7146 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7147 	if (head_ref_name) {
7148 		s->head_ref_name = strdup(head_ref_name);
7149 		if (s->head_ref_name == NULL) {
7150 			err = got_error_from_errno("strdup");
7151 			goto done;
7152 		}
7153 	}
7154 	s->repo = repo;
7155 
7156 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7157 		err = add_color(&s->colors, "\\$$",
7158 		    TOG_COLOR_TREE_SUBMODULE,
7159 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7160 		if (err)
7161 			goto done;
7162 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7163 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7164 		if (err)
7165 			goto done;
7166 		err = add_color(&s->colors, "/$",
7167 		    TOG_COLOR_TREE_DIRECTORY,
7168 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7169 		if (err)
7170 			goto done;
7171 
7172 		err = add_color(&s->colors, "\\*$",
7173 		    TOG_COLOR_TREE_EXECUTABLE,
7174 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7175 		if (err)
7176 			goto done;
7177 
7178 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7179 		    get_color_value("TOG_COLOR_COMMIT"));
7180 		if (err)
7181 			goto done;
7182 	}
7183 
7184 	view->show = show_tree_view;
7185 	view->input = input_tree_view;
7186 	view->close = close_tree_view;
7187 	view->search_start = search_start_tree_view;
7188 	view->search_next = search_next_tree_view;
7189 done:
7190 	free(commit_id_str);
7191 	if (commit)
7192 		got_object_commit_close(commit);
7193 	if (err)
7194 		close_tree_view(view);
7195 	return err;
7196 }
7197 
7198 static const struct got_error *
7199 close_tree_view(struct tog_view *view)
7200 {
7201 	struct tog_tree_view_state *s = &view->state.tree;
7202 
7203 	free_colors(&s->colors);
7204 	free(s->tree_label);
7205 	s->tree_label = NULL;
7206 	free(s->commit_id);
7207 	s->commit_id = NULL;
7208 	free(s->head_ref_name);
7209 	s->head_ref_name = NULL;
7210 	while (!TAILQ_EMPTY(&s->parents)) {
7211 		struct tog_parent_tree *parent;
7212 		parent = TAILQ_FIRST(&s->parents);
7213 		TAILQ_REMOVE(&s->parents, parent, entry);
7214 		if (parent->tree != s->root)
7215 			got_object_tree_close(parent->tree);
7216 		free(parent);
7217 
7218 	}
7219 	if (s->tree != NULL && s->tree != s->root)
7220 		got_object_tree_close(s->tree);
7221 	if (s->root)
7222 		got_object_tree_close(s->root);
7223 	return NULL;
7224 }
7225 
7226 static const struct got_error *
7227 search_start_tree_view(struct tog_view *view)
7228 {
7229 	struct tog_tree_view_state *s = &view->state.tree;
7230 
7231 	s->matched_entry = NULL;
7232 	return NULL;
7233 }
7234 
7235 static int
7236 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7237 {
7238 	regmatch_t regmatch;
7239 
7240 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7241 	    0) == 0;
7242 }
7243 
7244 static const struct got_error *
7245 search_next_tree_view(struct tog_view *view)
7246 {
7247 	struct tog_tree_view_state *s = &view->state.tree;
7248 	struct got_tree_entry *te = NULL;
7249 
7250 	if (!view->searching) {
7251 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7252 		return NULL;
7253 	}
7254 
7255 	if (s->matched_entry) {
7256 		if (view->searching == TOG_SEARCH_FORWARD) {
7257 			if (s->selected_entry)
7258 				te = got_tree_entry_get_next(s->tree,
7259 				    s->selected_entry);
7260 			else
7261 				te = got_object_tree_get_first_entry(s->tree);
7262 		} else {
7263 			if (s->selected_entry == NULL)
7264 				te = got_object_tree_get_last_entry(s->tree);
7265 			else
7266 				te = got_tree_entry_get_prev(s->tree,
7267 				    s->selected_entry);
7268 		}
7269 	} else {
7270 		if (s->selected_entry)
7271 			te = s->selected_entry;
7272 		else if (view->searching == TOG_SEARCH_FORWARD)
7273 			te = got_object_tree_get_first_entry(s->tree);
7274 		else
7275 			te = got_object_tree_get_last_entry(s->tree);
7276 	}
7277 
7278 	while (1) {
7279 		if (te == NULL) {
7280 			if (s->matched_entry == NULL) {
7281 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7282 				return NULL;
7283 			}
7284 			if (view->searching == TOG_SEARCH_FORWARD)
7285 				te = got_object_tree_get_first_entry(s->tree);
7286 			else
7287 				te = got_object_tree_get_last_entry(s->tree);
7288 		}
7289 
7290 		if (match_tree_entry(te, &view->regex)) {
7291 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7292 			s->matched_entry = te;
7293 			break;
7294 		}
7295 
7296 		if (view->searching == TOG_SEARCH_FORWARD)
7297 			te = got_tree_entry_get_next(s->tree, te);
7298 		else
7299 			te = got_tree_entry_get_prev(s->tree, te);
7300 	}
7301 
7302 	if (s->matched_entry) {
7303 		s->first_displayed_entry = s->matched_entry;
7304 		s->selected = 0;
7305 	}
7306 
7307 	return NULL;
7308 }
7309 
7310 static const struct got_error *
7311 show_tree_view(struct tog_view *view)
7312 {
7313 	const struct got_error *err = NULL;
7314 	struct tog_tree_view_state *s = &view->state.tree;
7315 	char *parent_path;
7316 
7317 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7318 	if (err)
7319 		return err;
7320 
7321 	err = draw_tree_entries(view, parent_path);
7322 	free(parent_path);
7323 
7324 	view_border(view);
7325 	return err;
7326 }
7327 
7328 static const struct got_error *
7329 tree_goto_line(struct tog_view *view, int nlines)
7330 {
7331 	const struct got_error		 *err = NULL;
7332 	struct tog_tree_view_state	 *s = &view->state.tree;
7333 	struct got_tree_entry		**fte, **lte, **ste;
7334 	int				  g, last, first = 1, i = 1;
7335 	int				  root = s->tree == s->root;
7336 	int				  off = root ? 1 : 2;
7337 
7338 	g = view->gline;
7339 	view->gline = 0;
7340 
7341 	if (g == 0)
7342 		g = 1;
7343 	else if (g > got_object_tree_get_nentries(s->tree))
7344 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7345 
7346 	fte = &s->first_displayed_entry;
7347 	lte = &s->last_displayed_entry;
7348 	ste = &s->selected_entry;
7349 
7350 	if (*fte != NULL) {
7351 		first = got_tree_entry_get_index(*fte);
7352 		first += off;  /* account for ".." */
7353 	}
7354 	last = got_tree_entry_get_index(*lte);
7355 	last += off;
7356 
7357 	if (g >= first && g <= last && g - first < nlines) {
7358 		s->selected = g - first;
7359 		return NULL;	/* gline is on the current page */
7360 	}
7361 
7362 	if (*ste != NULL) {
7363 		i = got_tree_entry_get_index(*ste);
7364 		i += off;
7365 	}
7366 
7367 	if (i < g) {
7368 		err = tree_scroll_down(view, g - i);
7369 		if (err)
7370 			return err;
7371 		if (got_tree_entry_get_index(*lte) >=
7372 		    got_object_tree_get_nentries(s->tree) - 1 &&
7373 		    first + s->selected < g &&
7374 		    s->selected < s->ndisplayed - 1) {
7375 			first = got_tree_entry_get_index(*fte);
7376 			first += off;
7377 			s->selected = g - first;
7378 		}
7379 	} else if (i > g)
7380 		tree_scroll_up(s, i - g);
7381 
7382 	if (g < nlines &&
7383 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7384 		s->selected = g - 1;
7385 
7386 	return NULL;
7387 }
7388 
7389 static const struct got_error *
7390 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7391 {
7392 	const struct got_error *err = NULL;
7393 	struct tog_tree_view_state *s = &view->state.tree;
7394 	struct got_tree_entry *te;
7395 	int n, nscroll = view->nlines - 3;
7396 
7397 	if (view->gline)
7398 		return tree_goto_line(view, nscroll);
7399 
7400 	switch (ch) {
7401 	case '0':
7402 	case '$':
7403 	case KEY_RIGHT:
7404 	case 'l':
7405 	case KEY_LEFT:
7406 	case 'h':
7407 		horizontal_scroll_input(view, ch);
7408 		break;
7409 	case 'i':
7410 		s->show_ids = !s->show_ids;
7411 		view->count = 0;
7412 		break;
7413 	case 'L':
7414 		view->count = 0;
7415 		if (!s->selected_entry)
7416 			break;
7417 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7418 		break;
7419 	case 'R':
7420 		view->count = 0;
7421 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7422 		break;
7423 	case 'g':
7424 	case '=':
7425 	case KEY_HOME:
7426 		s->selected = 0;
7427 		view->count = 0;
7428 		if (s->tree == s->root)
7429 			s->first_displayed_entry =
7430 			    got_object_tree_get_first_entry(s->tree);
7431 		else
7432 			s->first_displayed_entry = NULL;
7433 		break;
7434 	case 'G':
7435 	case '*':
7436 	case KEY_END: {
7437 		int eos = view->nlines - 3;
7438 
7439 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7440 			--eos;  /* border */
7441 		s->selected = 0;
7442 		view->count = 0;
7443 		te = got_object_tree_get_last_entry(s->tree);
7444 		for (n = 0; n < eos; n++) {
7445 			if (te == NULL) {
7446 				if (s->tree != s->root) {
7447 					s->first_displayed_entry = NULL;
7448 					n++;
7449 				}
7450 				break;
7451 			}
7452 			s->first_displayed_entry = te;
7453 			te = got_tree_entry_get_prev(s->tree, te);
7454 		}
7455 		if (n > 0)
7456 			s->selected = n - 1;
7457 		break;
7458 	}
7459 	case 'k':
7460 	case KEY_UP:
7461 	case CTRL('p'):
7462 		if (s->selected > 0) {
7463 			s->selected--;
7464 			break;
7465 		}
7466 		tree_scroll_up(s, 1);
7467 		if (s->selected_entry == NULL ||
7468 		    (s->tree == s->root && s->selected_entry ==
7469 		     got_object_tree_get_first_entry(s->tree)))
7470 			view->count = 0;
7471 		break;
7472 	case CTRL('u'):
7473 	case 'u':
7474 		nscroll /= 2;
7475 		/* FALL THROUGH */
7476 	case KEY_PPAGE:
7477 	case CTRL('b'):
7478 	case 'b':
7479 		if (s->tree == s->root) {
7480 			if (got_object_tree_get_first_entry(s->tree) ==
7481 			    s->first_displayed_entry)
7482 				s->selected -= MIN(s->selected, nscroll);
7483 		} else {
7484 			if (s->first_displayed_entry == NULL)
7485 				s->selected -= MIN(s->selected, nscroll);
7486 		}
7487 		tree_scroll_up(s, MAX(0, nscroll));
7488 		if (s->selected_entry == NULL ||
7489 		    (s->tree == s->root && s->selected_entry ==
7490 		     got_object_tree_get_first_entry(s->tree)))
7491 			view->count = 0;
7492 		break;
7493 	case 'j':
7494 	case KEY_DOWN:
7495 	case CTRL('n'):
7496 		if (s->selected < s->ndisplayed - 1) {
7497 			s->selected++;
7498 			break;
7499 		}
7500 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7501 		    == NULL) {
7502 			/* can't scroll any further */
7503 			view->count = 0;
7504 			break;
7505 		}
7506 		tree_scroll_down(view, 1);
7507 		break;
7508 	case CTRL('d'):
7509 	case 'd':
7510 		nscroll /= 2;
7511 		/* FALL THROUGH */
7512 	case KEY_NPAGE:
7513 	case CTRL('f'):
7514 	case 'f':
7515 	case ' ':
7516 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7517 		    == NULL) {
7518 			/* can't scroll any further; move cursor down */
7519 			if (s->selected < s->ndisplayed - 1)
7520 				s->selected += MIN(nscroll,
7521 				    s->ndisplayed - s->selected - 1);
7522 			else
7523 				view->count = 0;
7524 			break;
7525 		}
7526 		tree_scroll_down(view, nscroll);
7527 		break;
7528 	case KEY_ENTER:
7529 	case '\r':
7530 	case KEY_BACKSPACE:
7531 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7532 			struct tog_parent_tree *parent;
7533 			/* user selected '..' */
7534 			if (s->tree == s->root) {
7535 				view->count = 0;
7536 				break;
7537 			}
7538 			parent = TAILQ_FIRST(&s->parents);
7539 			TAILQ_REMOVE(&s->parents, parent,
7540 			    entry);
7541 			got_object_tree_close(s->tree);
7542 			s->tree = parent->tree;
7543 			s->first_displayed_entry =
7544 			    parent->first_displayed_entry;
7545 			s->selected_entry =
7546 			    parent->selected_entry;
7547 			s->selected = parent->selected;
7548 			if (s->selected > view->nlines - 3) {
7549 				err = offset_selection_down(view);
7550 				if (err)
7551 					break;
7552 			}
7553 			free(parent);
7554 		} else if (S_ISDIR(got_tree_entry_get_mode(
7555 		    s->selected_entry))) {
7556 			struct got_tree_object *subtree;
7557 			view->count = 0;
7558 			err = got_object_open_as_tree(&subtree, s->repo,
7559 			    got_tree_entry_get_id(s->selected_entry));
7560 			if (err)
7561 				break;
7562 			err = tree_view_visit_subtree(s, subtree);
7563 			if (err) {
7564 				got_object_tree_close(subtree);
7565 				break;
7566 			}
7567 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7568 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7569 		break;
7570 	case KEY_RESIZE:
7571 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7572 			s->selected = view->nlines - 4;
7573 		view->count = 0;
7574 		break;
7575 	default:
7576 		view->count = 0;
7577 		break;
7578 	}
7579 
7580 	return err;
7581 }
7582 
7583 __dead static void
7584 usage_tree(void)
7585 {
7586 	endwin();
7587 	fprintf(stderr,
7588 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7589 	    getprogname());
7590 	exit(1);
7591 }
7592 
7593 static const struct got_error *
7594 cmd_tree(int argc, char *argv[])
7595 {
7596 	const struct got_error *error;
7597 	struct got_repository *repo = NULL;
7598 	struct got_worktree *worktree = NULL;
7599 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7600 	struct got_object_id *commit_id = NULL;
7601 	struct got_commit_object *commit = NULL;
7602 	const char *commit_id_arg = NULL;
7603 	char *label = NULL;
7604 	struct got_reference *ref = NULL;
7605 	const char *head_ref_name = NULL;
7606 	int ch;
7607 	struct tog_view *view;
7608 	int *pack_fds = NULL;
7609 
7610 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7611 		switch (ch) {
7612 		case 'c':
7613 			commit_id_arg = optarg;
7614 			break;
7615 		case 'r':
7616 			repo_path = realpath(optarg, NULL);
7617 			if (repo_path == NULL)
7618 				return got_error_from_errno2("realpath",
7619 				    optarg);
7620 			break;
7621 		default:
7622 			usage_tree();
7623 			/* NOTREACHED */
7624 		}
7625 	}
7626 
7627 	argc -= optind;
7628 	argv += optind;
7629 
7630 	if (argc > 1)
7631 		usage_tree();
7632 
7633 	error = got_repo_pack_fds_open(&pack_fds);
7634 	if (error != NULL)
7635 		goto done;
7636 
7637 	if (repo_path == NULL) {
7638 		cwd = getcwd(NULL, 0);
7639 		if (cwd == NULL)
7640 			return got_error_from_errno("getcwd");
7641 		error = got_worktree_open(&worktree, cwd);
7642 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7643 			goto done;
7644 		if (worktree)
7645 			repo_path =
7646 			    strdup(got_worktree_get_repo_path(worktree));
7647 		else
7648 			repo_path = strdup(cwd);
7649 		if (repo_path == NULL) {
7650 			error = got_error_from_errno("strdup");
7651 			goto done;
7652 		}
7653 	}
7654 
7655 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7656 	if (error != NULL)
7657 		goto done;
7658 
7659 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7660 	    repo, worktree);
7661 	if (error)
7662 		goto done;
7663 
7664 	init_curses();
7665 
7666 	error = apply_unveil(got_repo_get_path(repo), NULL);
7667 	if (error)
7668 		goto done;
7669 
7670 	error = tog_load_refs(repo, 0);
7671 	if (error)
7672 		goto done;
7673 
7674 	if (commit_id_arg == NULL) {
7675 		error = got_repo_match_object_id(&commit_id, &label,
7676 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7677 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7678 		if (error)
7679 			goto done;
7680 		head_ref_name = label;
7681 	} else {
7682 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7683 		if (error == NULL)
7684 			head_ref_name = got_ref_get_name(ref);
7685 		else if (error->code != GOT_ERR_NOT_REF)
7686 			goto done;
7687 		error = got_repo_match_object_id(&commit_id, NULL,
7688 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7689 		if (error)
7690 			goto done;
7691 	}
7692 
7693 	error = got_object_open_as_commit(&commit, repo, commit_id);
7694 	if (error)
7695 		goto done;
7696 
7697 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7698 	if (view == NULL) {
7699 		error = got_error_from_errno("view_open");
7700 		goto done;
7701 	}
7702 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7703 	if (error)
7704 		goto done;
7705 	if (!got_path_is_root_dir(in_repo_path)) {
7706 		error = tree_view_walk_path(&view->state.tree, commit,
7707 		    in_repo_path);
7708 		if (error)
7709 			goto done;
7710 	}
7711 
7712 	if (worktree) {
7713 		/* Release work tree lock. */
7714 		got_worktree_close(worktree);
7715 		worktree = NULL;
7716 	}
7717 	error = view_loop(view);
7718 done:
7719 	free(repo_path);
7720 	free(cwd);
7721 	free(commit_id);
7722 	free(label);
7723 	if (ref)
7724 		got_ref_close(ref);
7725 	if (repo) {
7726 		const struct got_error *close_err = got_repo_close(repo);
7727 		if (error == NULL)
7728 			error = close_err;
7729 	}
7730 	if (pack_fds) {
7731 		const struct got_error *pack_err =
7732 		    got_repo_pack_fds_close(pack_fds);
7733 		if (error == NULL)
7734 			error = pack_err;
7735 	}
7736 	tog_free_refs();
7737 	return error;
7738 }
7739 
7740 static const struct got_error *
7741 ref_view_load_refs(struct tog_ref_view_state *s)
7742 {
7743 	struct got_reflist_entry *sre;
7744 	struct tog_reflist_entry *re;
7745 
7746 	s->nrefs = 0;
7747 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7748 		if (strncmp(got_ref_get_name(sre->ref),
7749 		    "refs/got/", 9) == 0 &&
7750 		    strncmp(got_ref_get_name(sre->ref),
7751 		    "refs/got/backup/", 16) != 0)
7752 			continue;
7753 
7754 		re = malloc(sizeof(*re));
7755 		if (re == NULL)
7756 			return got_error_from_errno("malloc");
7757 
7758 		re->ref = got_ref_dup(sre->ref);
7759 		if (re->ref == NULL)
7760 			return got_error_from_errno("got_ref_dup");
7761 		re->idx = s->nrefs++;
7762 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7763 	}
7764 
7765 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7766 	return NULL;
7767 }
7768 
7769 static void
7770 ref_view_free_refs(struct tog_ref_view_state *s)
7771 {
7772 	struct tog_reflist_entry *re;
7773 
7774 	while (!TAILQ_EMPTY(&s->refs)) {
7775 		re = TAILQ_FIRST(&s->refs);
7776 		TAILQ_REMOVE(&s->refs, re, entry);
7777 		got_ref_close(re->ref);
7778 		free(re);
7779 	}
7780 }
7781 
7782 static const struct got_error *
7783 open_ref_view(struct tog_view *view, struct got_repository *repo)
7784 {
7785 	const struct got_error *err = NULL;
7786 	struct tog_ref_view_state *s = &view->state.ref;
7787 
7788 	s->selected_entry = 0;
7789 	s->repo = repo;
7790 
7791 	TAILQ_INIT(&s->refs);
7792 	STAILQ_INIT(&s->colors);
7793 
7794 	err = ref_view_load_refs(s);
7795 	if (err)
7796 		return err;
7797 
7798 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7799 		err = add_color(&s->colors, "^refs/heads/",
7800 		    TOG_COLOR_REFS_HEADS,
7801 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7802 		if (err)
7803 			goto done;
7804 
7805 		err = add_color(&s->colors, "^refs/tags/",
7806 		    TOG_COLOR_REFS_TAGS,
7807 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7808 		if (err)
7809 			goto done;
7810 
7811 		err = add_color(&s->colors, "^refs/remotes/",
7812 		    TOG_COLOR_REFS_REMOTES,
7813 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7814 		if (err)
7815 			goto done;
7816 
7817 		err = add_color(&s->colors, "^refs/got/backup/",
7818 		    TOG_COLOR_REFS_BACKUP,
7819 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7820 		if (err)
7821 			goto done;
7822 	}
7823 
7824 	view->show = show_ref_view;
7825 	view->input = input_ref_view;
7826 	view->close = close_ref_view;
7827 	view->search_start = search_start_ref_view;
7828 	view->search_next = search_next_ref_view;
7829 done:
7830 	if (err)
7831 		free_colors(&s->colors);
7832 	return err;
7833 }
7834 
7835 static const struct got_error *
7836 close_ref_view(struct tog_view *view)
7837 {
7838 	struct tog_ref_view_state *s = &view->state.ref;
7839 
7840 	ref_view_free_refs(s);
7841 	free_colors(&s->colors);
7842 
7843 	return NULL;
7844 }
7845 
7846 static const struct got_error *
7847 resolve_reflist_entry(struct got_object_id **commit_id,
7848     struct tog_reflist_entry *re, struct got_repository *repo)
7849 {
7850 	const struct got_error *err = NULL;
7851 	struct got_object_id *obj_id;
7852 	struct got_tag_object *tag = NULL;
7853 	int obj_type;
7854 
7855 	*commit_id = NULL;
7856 
7857 	err = got_ref_resolve(&obj_id, repo, re->ref);
7858 	if (err)
7859 		return err;
7860 
7861 	err = got_object_get_type(&obj_type, repo, obj_id);
7862 	if (err)
7863 		goto done;
7864 
7865 	switch (obj_type) {
7866 	case GOT_OBJ_TYPE_COMMIT:
7867 		*commit_id = obj_id;
7868 		break;
7869 	case GOT_OBJ_TYPE_TAG:
7870 		err = got_object_open_as_tag(&tag, repo, obj_id);
7871 		if (err)
7872 			goto done;
7873 		free(obj_id);
7874 		err = got_object_get_type(&obj_type, repo,
7875 		    got_object_tag_get_object_id(tag));
7876 		if (err)
7877 			goto done;
7878 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7879 			err = got_error(GOT_ERR_OBJ_TYPE);
7880 			goto done;
7881 		}
7882 		*commit_id = got_object_id_dup(
7883 		    got_object_tag_get_object_id(tag));
7884 		if (*commit_id == NULL) {
7885 			err = got_error_from_errno("got_object_id_dup");
7886 			goto done;
7887 		}
7888 		break;
7889 	default:
7890 		err = got_error(GOT_ERR_OBJ_TYPE);
7891 		break;
7892 	}
7893 
7894 done:
7895 	if (tag)
7896 		got_object_tag_close(tag);
7897 	if (err) {
7898 		free(*commit_id);
7899 		*commit_id = NULL;
7900 	}
7901 	return err;
7902 }
7903 
7904 static const struct got_error *
7905 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7906     struct tog_reflist_entry *re, struct got_repository *repo)
7907 {
7908 	struct tog_view *log_view;
7909 	const struct got_error *err = NULL;
7910 	struct got_object_id *commit_id = NULL;
7911 
7912 	*new_view = NULL;
7913 
7914 	err = resolve_reflist_entry(&commit_id, re, repo);
7915 	if (err) {
7916 		if (err->code != GOT_ERR_OBJ_TYPE)
7917 			return err;
7918 		else
7919 			return NULL;
7920 	}
7921 
7922 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7923 	if (log_view == NULL) {
7924 		err = got_error_from_errno("view_open");
7925 		goto done;
7926 	}
7927 
7928 	err = open_log_view(log_view, commit_id, repo,
7929 	    got_ref_get_name(re->ref), "", 0);
7930 done:
7931 	if (err)
7932 		view_close(log_view);
7933 	else
7934 		*new_view = log_view;
7935 	free(commit_id);
7936 	return err;
7937 }
7938 
7939 static void
7940 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7941 {
7942 	struct tog_reflist_entry *re;
7943 	int i = 0;
7944 
7945 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7946 		return;
7947 
7948 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7949 	while (i++ < maxscroll) {
7950 		if (re == NULL)
7951 			break;
7952 		s->first_displayed_entry = re;
7953 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7954 	}
7955 }
7956 
7957 static const struct got_error *
7958 ref_scroll_down(struct tog_view *view, int maxscroll)
7959 {
7960 	struct tog_ref_view_state *s = &view->state.ref;
7961 	struct tog_reflist_entry *next, *last;
7962 	int n = 0;
7963 
7964 	if (s->first_displayed_entry)
7965 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7966 	else
7967 		next = TAILQ_FIRST(&s->refs);
7968 
7969 	last = s->last_displayed_entry;
7970 	while (next && n++ < maxscroll) {
7971 		if (last) {
7972 			s->last_displayed_entry = last;
7973 			last = TAILQ_NEXT(last, entry);
7974 		}
7975 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7976 			s->first_displayed_entry = next;
7977 			next = TAILQ_NEXT(next, entry);
7978 		}
7979 	}
7980 
7981 	return NULL;
7982 }
7983 
7984 static const struct got_error *
7985 search_start_ref_view(struct tog_view *view)
7986 {
7987 	struct tog_ref_view_state *s = &view->state.ref;
7988 
7989 	s->matched_entry = NULL;
7990 	return NULL;
7991 }
7992 
7993 static int
7994 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7995 {
7996 	regmatch_t regmatch;
7997 
7998 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7999 	    0) == 0;
8000 }
8001 
8002 static const struct got_error *
8003 search_next_ref_view(struct tog_view *view)
8004 {
8005 	struct tog_ref_view_state *s = &view->state.ref;
8006 	struct tog_reflist_entry *re = NULL;
8007 
8008 	if (!view->searching) {
8009 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8010 		return NULL;
8011 	}
8012 
8013 	if (s->matched_entry) {
8014 		if (view->searching == TOG_SEARCH_FORWARD) {
8015 			if (s->selected_entry)
8016 				re = TAILQ_NEXT(s->selected_entry, entry);
8017 			else
8018 				re = TAILQ_PREV(s->selected_entry,
8019 				    tog_reflist_head, entry);
8020 		} else {
8021 			if (s->selected_entry == NULL)
8022 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8023 			else
8024 				re = TAILQ_PREV(s->selected_entry,
8025 				    tog_reflist_head, entry);
8026 		}
8027 	} else {
8028 		if (s->selected_entry)
8029 			re = s->selected_entry;
8030 		else if (view->searching == TOG_SEARCH_FORWARD)
8031 			re = TAILQ_FIRST(&s->refs);
8032 		else
8033 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8034 	}
8035 
8036 	while (1) {
8037 		if (re == NULL) {
8038 			if (s->matched_entry == NULL) {
8039 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8040 				return NULL;
8041 			}
8042 			if (view->searching == TOG_SEARCH_FORWARD)
8043 				re = TAILQ_FIRST(&s->refs);
8044 			else
8045 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8046 		}
8047 
8048 		if (match_reflist_entry(re, &view->regex)) {
8049 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8050 			s->matched_entry = re;
8051 			break;
8052 		}
8053 
8054 		if (view->searching == TOG_SEARCH_FORWARD)
8055 			re = TAILQ_NEXT(re, entry);
8056 		else
8057 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8058 	}
8059 
8060 	if (s->matched_entry) {
8061 		s->first_displayed_entry = s->matched_entry;
8062 		s->selected = 0;
8063 	}
8064 
8065 	return NULL;
8066 }
8067 
8068 static const struct got_error *
8069 show_ref_view(struct tog_view *view)
8070 {
8071 	const struct got_error *err = NULL;
8072 	struct tog_ref_view_state *s = &view->state.ref;
8073 	struct tog_reflist_entry *re;
8074 	char *line = NULL;
8075 	wchar_t *wline;
8076 	struct tog_color *tc;
8077 	int width, n, scrollx;
8078 	int limit = view->nlines;
8079 
8080 	werase(view->window);
8081 
8082 	s->ndisplayed = 0;
8083 	if (view_is_hsplit_top(view))
8084 		--limit;  /* border */
8085 
8086 	if (limit == 0)
8087 		return NULL;
8088 
8089 	re = s->first_displayed_entry;
8090 
8091 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8092 	    s->nrefs) == -1)
8093 		return got_error_from_errno("asprintf");
8094 
8095 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8096 	if (err) {
8097 		free(line);
8098 		return err;
8099 	}
8100 	if (view_needs_focus_indication(view))
8101 		wstandout(view->window);
8102 	waddwstr(view->window, wline);
8103 	while (width++ < view->ncols)
8104 		waddch(view->window, ' ');
8105 	if (view_needs_focus_indication(view))
8106 		wstandend(view->window);
8107 	free(wline);
8108 	wline = NULL;
8109 	free(line);
8110 	line = NULL;
8111 	if (--limit <= 0)
8112 		return NULL;
8113 
8114 	n = 0;
8115 	view->maxx = 0;
8116 	while (re && limit > 0) {
8117 		char *line = NULL;
8118 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8119 
8120 		if (s->show_date) {
8121 			struct got_commit_object *ci;
8122 			struct got_tag_object *tag;
8123 			struct got_object_id *id;
8124 			struct tm tm;
8125 			time_t t;
8126 
8127 			err = got_ref_resolve(&id, s->repo, re->ref);
8128 			if (err)
8129 				return err;
8130 			err = got_object_open_as_tag(&tag, s->repo, id);
8131 			if (err) {
8132 				if (err->code != GOT_ERR_OBJ_TYPE) {
8133 					free(id);
8134 					return err;
8135 				}
8136 				err = got_object_open_as_commit(&ci, s->repo,
8137 				    id);
8138 				if (err) {
8139 					free(id);
8140 					return err;
8141 				}
8142 				t = got_object_commit_get_committer_time(ci);
8143 				got_object_commit_close(ci);
8144 			} else {
8145 				t = got_object_tag_get_tagger_time(tag);
8146 				got_object_tag_close(tag);
8147 			}
8148 			free(id);
8149 			if (gmtime_r(&t, &tm) == NULL)
8150 				return got_error_from_errno("gmtime_r");
8151 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8152 				return got_error(GOT_ERR_NO_SPACE);
8153 		}
8154 		if (got_ref_is_symbolic(re->ref)) {
8155 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8156 			    ymd : "", got_ref_get_name(re->ref),
8157 			    got_ref_get_symref_target(re->ref)) == -1)
8158 				return got_error_from_errno("asprintf");
8159 		} else if (s->show_ids) {
8160 			struct got_object_id *id;
8161 			char *id_str;
8162 			err = got_ref_resolve(&id, s->repo, re->ref);
8163 			if (err)
8164 				return err;
8165 			err = got_object_id_str(&id_str, id);
8166 			if (err) {
8167 				free(id);
8168 				return err;
8169 			}
8170 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8171 			    got_ref_get_name(re->ref), id_str) == -1) {
8172 				err = got_error_from_errno("asprintf");
8173 				free(id);
8174 				free(id_str);
8175 				return err;
8176 			}
8177 			free(id);
8178 			free(id_str);
8179 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8180 		    got_ref_get_name(re->ref)) == -1)
8181 			return got_error_from_errno("asprintf");
8182 
8183 		/* use full line width to determine view->maxx */
8184 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8185 		if (err) {
8186 			free(line);
8187 			return err;
8188 		}
8189 		view->maxx = MAX(view->maxx, width);
8190 		free(wline);
8191 		wline = NULL;
8192 
8193 		err = format_line(&wline, &width, &scrollx, line, view->x,
8194 		    view->ncols, 0, 0);
8195 		if (err) {
8196 			free(line);
8197 			return err;
8198 		}
8199 		if (n == s->selected) {
8200 			if (view->focussed)
8201 				wstandout(view->window);
8202 			s->selected_entry = re;
8203 		}
8204 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8205 		if (tc)
8206 			wattr_on(view->window,
8207 			    COLOR_PAIR(tc->colorpair), NULL);
8208 		waddwstr(view->window, &wline[scrollx]);
8209 		if (tc)
8210 			wattr_off(view->window,
8211 			    COLOR_PAIR(tc->colorpair), NULL);
8212 		if (width < view->ncols)
8213 			waddch(view->window, '\n');
8214 		if (n == s->selected && view->focussed)
8215 			wstandend(view->window);
8216 		free(line);
8217 		free(wline);
8218 		wline = NULL;
8219 		n++;
8220 		s->ndisplayed++;
8221 		s->last_displayed_entry = re;
8222 
8223 		limit--;
8224 		re = TAILQ_NEXT(re, entry);
8225 	}
8226 
8227 	view_border(view);
8228 	return err;
8229 }
8230 
8231 static const struct got_error *
8232 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8233     struct tog_reflist_entry *re, struct got_repository *repo)
8234 {
8235 	const struct got_error *err = NULL;
8236 	struct got_object_id *commit_id = NULL;
8237 	struct tog_view *tree_view;
8238 
8239 	*new_view = NULL;
8240 
8241 	err = resolve_reflist_entry(&commit_id, re, repo);
8242 	if (err) {
8243 		if (err->code != GOT_ERR_OBJ_TYPE)
8244 			return err;
8245 		else
8246 			return NULL;
8247 	}
8248 
8249 
8250 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8251 	if (tree_view == NULL) {
8252 		err = got_error_from_errno("view_open");
8253 		goto done;
8254 	}
8255 
8256 	err = open_tree_view(tree_view, commit_id,
8257 	    got_ref_get_name(re->ref), repo);
8258 	if (err)
8259 		goto done;
8260 
8261 	*new_view = tree_view;
8262 done:
8263 	free(commit_id);
8264 	return err;
8265 }
8266 
8267 static const struct got_error *
8268 ref_goto_line(struct tog_view *view, int nlines)
8269 {
8270 	const struct got_error		*err = NULL;
8271 	struct tog_ref_view_state	*s = &view->state.ref;
8272 	int				 g, idx = s->selected_entry->idx;
8273 
8274 	g = view->gline;
8275 	view->gline = 0;
8276 
8277 	if (g == 0)
8278 		g = 1;
8279 	else if (g > s->nrefs)
8280 		g = s->nrefs;
8281 
8282 	if (g >= s->first_displayed_entry->idx + 1 &&
8283 	    g <= s->last_displayed_entry->idx + 1 &&
8284 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8285 		s->selected = g - s->first_displayed_entry->idx - 1;
8286 		return NULL;
8287 	}
8288 
8289 	if (idx + 1 < g) {
8290 		err = ref_scroll_down(view, g - idx - 1);
8291 		if (err)
8292 			return err;
8293 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8294 		    s->first_displayed_entry->idx + s->selected < g &&
8295 		    s->selected < s->ndisplayed - 1)
8296 			s->selected = g - s->first_displayed_entry->idx - 1;
8297 	} else if (idx + 1 > g)
8298 		ref_scroll_up(s, idx - g + 1);
8299 
8300 	if (g < nlines && s->first_displayed_entry->idx == 0)
8301 		s->selected = g - 1;
8302 
8303 	return NULL;
8304 
8305 }
8306 
8307 static const struct got_error *
8308 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8309 {
8310 	const struct got_error *err = NULL;
8311 	struct tog_ref_view_state *s = &view->state.ref;
8312 	struct tog_reflist_entry *re;
8313 	int n, nscroll = view->nlines - 1;
8314 
8315 	if (view->gline)
8316 		return ref_goto_line(view, nscroll);
8317 
8318 	switch (ch) {
8319 	case '0':
8320 	case '$':
8321 	case KEY_RIGHT:
8322 	case 'l':
8323 	case KEY_LEFT:
8324 	case 'h':
8325 		horizontal_scroll_input(view, ch);
8326 		break;
8327 	case 'i':
8328 		s->show_ids = !s->show_ids;
8329 		view->count = 0;
8330 		break;
8331 	case 'm':
8332 		s->show_date = !s->show_date;
8333 		view->count = 0;
8334 		break;
8335 	case 'o':
8336 		s->sort_by_date = !s->sort_by_date;
8337 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8338 		view->count = 0;
8339 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8340 		    got_ref_cmp_by_commit_timestamp_descending :
8341 		    tog_ref_cmp_by_name, s->repo);
8342 		if (err)
8343 			break;
8344 		got_reflist_object_id_map_free(tog_refs_idmap);
8345 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8346 		    &tog_refs, s->repo);
8347 		if (err)
8348 			break;
8349 		ref_view_free_refs(s);
8350 		err = ref_view_load_refs(s);
8351 		break;
8352 	case KEY_ENTER:
8353 	case '\r':
8354 		view->count = 0;
8355 		if (!s->selected_entry)
8356 			break;
8357 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8358 		break;
8359 	case 'T':
8360 		view->count = 0;
8361 		if (!s->selected_entry)
8362 			break;
8363 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8364 		break;
8365 	case 'g':
8366 	case '=':
8367 	case KEY_HOME:
8368 		s->selected = 0;
8369 		view->count = 0;
8370 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8371 		break;
8372 	case 'G':
8373 	case '*':
8374 	case KEY_END: {
8375 		int eos = view->nlines - 1;
8376 
8377 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8378 			--eos;  /* border */
8379 		s->selected = 0;
8380 		view->count = 0;
8381 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8382 		for (n = 0; n < eos; n++) {
8383 			if (re == NULL)
8384 				break;
8385 			s->first_displayed_entry = re;
8386 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8387 		}
8388 		if (n > 0)
8389 			s->selected = n - 1;
8390 		break;
8391 	}
8392 	case 'k':
8393 	case KEY_UP:
8394 	case CTRL('p'):
8395 		if (s->selected > 0) {
8396 			s->selected--;
8397 			break;
8398 		}
8399 		ref_scroll_up(s, 1);
8400 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8401 			view->count = 0;
8402 		break;
8403 	case CTRL('u'):
8404 	case 'u':
8405 		nscroll /= 2;
8406 		/* FALL THROUGH */
8407 	case KEY_PPAGE:
8408 	case CTRL('b'):
8409 	case 'b':
8410 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8411 			s->selected -= MIN(nscroll, s->selected);
8412 		ref_scroll_up(s, MAX(0, nscroll));
8413 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8414 			view->count = 0;
8415 		break;
8416 	case 'j':
8417 	case KEY_DOWN:
8418 	case CTRL('n'):
8419 		if (s->selected < s->ndisplayed - 1) {
8420 			s->selected++;
8421 			break;
8422 		}
8423 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8424 			/* can't scroll any further */
8425 			view->count = 0;
8426 			break;
8427 		}
8428 		ref_scroll_down(view, 1);
8429 		break;
8430 	case CTRL('d'):
8431 	case 'd':
8432 		nscroll /= 2;
8433 		/* FALL THROUGH */
8434 	case KEY_NPAGE:
8435 	case CTRL('f'):
8436 	case 'f':
8437 	case ' ':
8438 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8439 			/* can't scroll any further; move cursor down */
8440 			if (s->selected < s->ndisplayed - 1)
8441 				s->selected += MIN(nscroll,
8442 				    s->ndisplayed - s->selected - 1);
8443 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8444 				s->selected += s->ndisplayed - s->selected - 1;
8445 			view->count = 0;
8446 			break;
8447 		}
8448 		ref_scroll_down(view, nscroll);
8449 		break;
8450 	case CTRL('l'):
8451 		view->count = 0;
8452 		tog_free_refs();
8453 		err = tog_load_refs(s->repo, s->sort_by_date);
8454 		if (err)
8455 			break;
8456 		ref_view_free_refs(s);
8457 		err = ref_view_load_refs(s);
8458 		break;
8459 	case KEY_RESIZE:
8460 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8461 			s->selected = view->nlines - 2;
8462 		break;
8463 	default:
8464 		view->count = 0;
8465 		break;
8466 	}
8467 
8468 	return err;
8469 }
8470 
8471 __dead static void
8472 usage_ref(void)
8473 {
8474 	endwin();
8475 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8476 	    getprogname());
8477 	exit(1);
8478 }
8479 
8480 static const struct got_error *
8481 cmd_ref(int argc, char *argv[])
8482 {
8483 	const struct got_error *error;
8484 	struct got_repository *repo = NULL;
8485 	struct got_worktree *worktree = NULL;
8486 	char *cwd = NULL, *repo_path = NULL;
8487 	int ch;
8488 	struct tog_view *view;
8489 	int *pack_fds = NULL;
8490 
8491 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8492 		switch (ch) {
8493 		case 'r':
8494 			repo_path = realpath(optarg, NULL);
8495 			if (repo_path == NULL)
8496 				return got_error_from_errno2("realpath",
8497 				    optarg);
8498 			break;
8499 		default:
8500 			usage_ref();
8501 			/* NOTREACHED */
8502 		}
8503 	}
8504 
8505 	argc -= optind;
8506 	argv += optind;
8507 
8508 	if (argc > 1)
8509 		usage_ref();
8510 
8511 	error = got_repo_pack_fds_open(&pack_fds);
8512 	if (error != NULL)
8513 		goto done;
8514 
8515 	if (repo_path == NULL) {
8516 		cwd = getcwd(NULL, 0);
8517 		if (cwd == NULL)
8518 			return got_error_from_errno("getcwd");
8519 		error = got_worktree_open(&worktree, cwd);
8520 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8521 			goto done;
8522 		if (worktree)
8523 			repo_path =
8524 			    strdup(got_worktree_get_repo_path(worktree));
8525 		else
8526 			repo_path = strdup(cwd);
8527 		if (repo_path == NULL) {
8528 			error = got_error_from_errno("strdup");
8529 			goto done;
8530 		}
8531 	}
8532 
8533 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8534 	if (error != NULL)
8535 		goto done;
8536 
8537 	init_curses();
8538 
8539 	error = apply_unveil(got_repo_get_path(repo), NULL);
8540 	if (error)
8541 		goto done;
8542 
8543 	error = tog_load_refs(repo, 0);
8544 	if (error)
8545 		goto done;
8546 
8547 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8548 	if (view == NULL) {
8549 		error = got_error_from_errno("view_open");
8550 		goto done;
8551 	}
8552 
8553 	error = open_ref_view(view, repo);
8554 	if (error)
8555 		goto done;
8556 
8557 	if (worktree) {
8558 		/* Release work tree lock. */
8559 		got_worktree_close(worktree);
8560 		worktree = NULL;
8561 	}
8562 	error = view_loop(view);
8563 done:
8564 	free(repo_path);
8565 	free(cwd);
8566 	if (repo) {
8567 		const struct got_error *close_err = got_repo_close(repo);
8568 		if (close_err)
8569 			error = close_err;
8570 	}
8571 	if (pack_fds) {
8572 		const struct got_error *pack_err =
8573 		    got_repo_pack_fds_close(pack_fds);
8574 		if (error == NULL)
8575 			error = pack_err;
8576 	}
8577 	tog_free_refs();
8578 	return error;
8579 }
8580 
8581 static const struct got_error*
8582 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8583     const char *str)
8584 {
8585 	size_t len;
8586 
8587 	if (win == NULL)
8588 		win = stdscr;
8589 
8590 	len = strlen(str);
8591 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8592 
8593 	if (focus)
8594 		wstandout(win);
8595 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8596 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8597 	if (focus)
8598 		wstandend(win);
8599 
8600 	return NULL;
8601 }
8602 
8603 static const struct got_error *
8604 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8605 {
8606 	off_t *p;
8607 
8608 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8609 	if (p == NULL) {
8610 		free(*line_offsets);
8611 		*line_offsets = NULL;
8612 		return got_error_from_errno("reallocarray");
8613 	}
8614 
8615 	*line_offsets = p;
8616 	(*line_offsets)[*nlines] = off;
8617 	++(*nlines);
8618 	return NULL;
8619 }
8620 
8621 static const struct got_error *
8622 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8623 {
8624 	*ret = 0;
8625 
8626 	for (;n > 0; --n, ++km) {
8627 		char	*t0, *t, *k;
8628 		size_t	 len = 1;
8629 
8630 		if (km->keys == NULL)
8631 			continue;
8632 
8633 		t = t0 = strdup(km->keys);
8634 		if (t0 == NULL)
8635 			return got_error_from_errno("strdup");
8636 
8637 		len += strlen(t);
8638 		while ((k = strsep(&t, " ")) != NULL)
8639 			len += strlen(k) > 1 ? 2 : 0;
8640 		free(t0);
8641 		*ret = MAX(*ret, len);
8642 	}
8643 
8644 	return NULL;
8645 }
8646 
8647 /*
8648  * Write keymap section headers, keys, and key info in km to f.
8649  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8650  * wrap control and symbolic keys in guillemets, else use <>.
8651  */
8652 static const struct got_error *
8653 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8654 {
8655 	int n, len = width;
8656 
8657 	if (km->keys) {
8658 		static const char *u8_glyph[] = {
8659 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8660 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8661 		};
8662 		char	*t0, *t, *k;
8663 		int	 cs, s, first = 1;
8664 
8665 		cs = got_locale_is_utf8();
8666 
8667 		t = t0 = strdup(km->keys);
8668 		if (t0 == NULL)
8669 			return got_error_from_errno("strdup");
8670 
8671 		len = strlen(km->keys);
8672 		while ((k = strsep(&t, " ")) != NULL) {
8673 			s = strlen(k) > 1;  /* control or symbolic key */
8674 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8675 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8676 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8677 			if (n < 0) {
8678 				free(t0);
8679 				return got_error_from_errno("fprintf");
8680 			}
8681 			first = 0;
8682 			len += s ? 2 : 0;
8683 			*off += n;
8684 		}
8685 		free(t0);
8686 	}
8687 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8688 	if (n < 0)
8689 		return got_error_from_errno("fprintf");
8690 	*off += n;
8691 
8692 	return NULL;
8693 }
8694 
8695 static const struct got_error *
8696 format_help(struct tog_help_view_state *s)
8697 {
8698 	const struct got_error		*err = NULL;
8699 	off_t				 off = 0;
8700 	int				 i, max, n, show = s->all;
8701 	static const struct tog_key_map	 km[] = {
8702 #define KEYMAP_(info, type)	{ NULL, (info), type }
8703 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8704 		GENERATE_HELP
8705 #undef KEYMAP_
8706 #undef KEY_
8707 	};
8708 
8709 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8710 	if (err)
8711 		return err;
8712 
8713 	n = nitems(km);
8714 	err = max_key_str(&max, km, n);
8715 	if (err)
8716 		return err;
8717 
8718 	for (i = 0; i < n; ++i) {
8719 		if (km[i].keys == NULL) {
8720 			show = s->all;
8721 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8722 			    km[i].type == s->type || s->all)
8723 				show = 1;
8724 		}
8725 		if (show) {
8726 			err = format_help_line(&off, s->f, &km[i], max);
8727 			if (err)
8728 				return err;
8729 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8730 			if (err)
8731 				return err;
8732 		}
8733 	}
8734 	fputc('\n', s->f);
8735 	++off;
8736 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8737 	return err;
8738 }
8739 
8740 static const struct got_error *
8741 create_help(struct tog_help_view_state *s)
8742 {
8743 	FILE			*f;
8744 	const struct got_error	*err;
8745 
8746 	free(s->line_offsets);
8747 	s->line_offsets = NULL;
8748 	s->nlines = 0;
8749 
8750 	f = got_opentemp();
8751 	if (f == NULL)
8752 		return got_error_from_errno("got_opentemp");
8753 	s->f = f;
8754 
8755 	err = format_help(s);
8756 	if (err)
8757 		return err;
8758 
8759 	if (s->f && fflush(s->f) != 0)
8760 		return got_error_from_errno("fflush");
8761 
8762 	return NULL;
8763 }
8764 
8765 static const struct got_error *
8766 search_start_help_view(struct tog_view *view)
8767 {
8768 	view->state.help.matched_line = 0;
8769 	return NULL;
8770 }
8771 
8772 static void
8773 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8774     size_t *nlines, int **first, int **last, int **match, int **selected)
8775 {
8776 	struct tog_help_view_state *s = &view->state.help;
8777 
8778 	*f = s->f;
8779 	*nlines = s->nlines;
8780 	*line_offsets = s->line_offsets;
8781 	*match = &s->matched_line;
8782 	*first = &s->first_displayed_line;
8783 	*last = &s->last_displayed_line;
8784 	*selected = &s->selected_line;
8785 }
8786 
8787 static const struct got_error *
8788 show_help_view(struct tog_view *view)
8789 {
8790 	struct tog_help_view_state	*s = &view->state.help;
8791 	const struct got_error		*err;
8792 	regmatch_t			*regmatch = &view->regmatch;
8793 	wchar_t				*wline;
8794 	char				*line;
8795 	ssize_t				 linelen;
8796 	size_t				 linesz = 0;
8797 	int				 width, nprinted = 0, rc = 0;
8798 	int				 eos = view->nlines;
8799 
8800 	if (view_is_hsplit_top(view))
8801 		--eos;  /* account for border */
8802 
8803 	s->lineno = 0;
8804 	rewind(s->f);
8805 	werase(view->window);
8806 
8807 	if (view->gline > s->nlines - 1)
8808 		view->gline = s->nlines - 1;
8809 
8810 	err = win_draw_center(view->window, 0, 0, view->ncols,
8811 	    view_needs_focus_indication(view),
8812 	    "tog help (press q to return to tog)");
8813 	if (err)
8814 		return err;
8815 	if (eos <= 1)
8816 		return NULL;
8817 	waddstr(view->window, "\n\n");
8818 	eos -= 2;
8819 
8820 	s->eof = 0;
8821 	view->maxx = 0;
8822 	line = NULL;
8823 	while (eos > 0 && nprinted < eos) {
8824 		attr_t attr = 0;
8825 
8826 		linelen = getline(&line, &linesz, s->f);
8827 		if (linelen == -1) {
8828 			if (!feof(s->f)) {
8829 				free(line);
8830 				return got_ferror(s->f, GOT_ERR_IO);
8831 			}
8832 			s->eof = 1;
8833 			break;
8834 		}
8835 		if (++s->lineno < s->first_displayed_line)
8836 			continue;
8837 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8838 			continue;
8839 		if (s->lineno == view->hiline)
8840 			attr = A_STANDOUT;
8841 
8842 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8843 		    view->x ? 1 : 0);
8844 		if (err) {
8845 			free(line);
8846 			return err;
8847 		}
8848 		view->maxx = MAX(view->maxx, width);
8849 		free(wline);
8850 		wline = NULL;
8851 
8852 		if (attr)
8853 			wattron(view->window, attr);
8854 		if (s->first_displayed_line + nprinted == s->matched_line &&
8855 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8856 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8857 			    view->window, view->x, regmatch);
8858 			if (err) {
8859 				free(line);
8860 				return err;
8861 			}
8862 		} else {
8863 			int skip;
8864 
8865 			err = format_line(&wline, &width, &skip, line,
8866 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8867 			if (err) {
8868 				free(line);
8869 				return err;
8870 			}
8871 			waddwstr(view->window, &wline[skip]);
8872 			free(wline);
8873 			wline = NULL;
8874 		}
8875 		if (s->lineno == view->hiline) {
8876 			while (width++ < view->ncols)
8877 				waddch(view->window, ' ');
8878 		} else {
8879 			if (width < view->ncols)
8880 				waddch(view->window, '\n');
8881 		}
8882 		if (attr)
8883 			wattroff(view->window, attr);
8884 		if (++nprinted == 1)
8885 			s->first_displayed_line = s->lineno;
8886 	}
8887 	free(line);
8888 	if (nprinted > 0)
8889 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8890 	else
8891 		s->last_displayed_line = s->first_displayed_line;
8892 
8893 	view_border(view);
8894 
8895 	if (s->eof) {
8896 		rc = waddnstr(view->window,
8897 		    "See the tog(1) manual page for full documentation",
8898 		    view->ncols - 1);
8899 		if (rc == ERR)
8900 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8901 	} else {
8902 		wmove(view->window, view->nlines - 1, 0);
8903 		wclrtoeol(view->window);
8904 		wstandout(view->window);
8905 		rc = waddnstr(view->window, "scroll down for more...",
8906 		    view->ncols - 1);
8907 		if (rc == ERR)
8908 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8909 		if (getcurx(view->window) < view->ncols - 6) {
8910 			rc = wprintw(view->window, "[%.0f%%]",
8911 			    100.00 * s->last_displayed_line / s->nlines);
8912 			if (rc == ERR)
8913 				return got_error_msg(GOT_ERR_IO, "wprintw");
8914 		}
8915 		wstandend(view->window);
8916 	}
8917 
8918 	return NULL;
8919 }
8920 
8921 static const struct got_error *
8922 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8923 {
8924 	struct tog_help_view_state	*s = &view->state.help;
8925 	const struct got_error		*err = NULL;
8926 	char				*line = NULL;
8927 	ssize_t				 linelen;
8928 	size_t				 linesz = 0;
8929 	int				 eos, nscroll;
8930 
8931 	eos = nscroll = view->nlines;
8932 	if (view_is_hsplit_top(view))
8933 		--eos;  /* border */
8934 
8935 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8936 
8937 	switch (ch) {
8938 	case '0':
8939 	case '$':
8940 	case KEY_RIGHT:
8941 	case 'l':
8942 	case KEY_LEFT:
8943 	case 'h':
8944 		horizontal_scroll_input(view, ch);
8945 		break;
8946 	case 'g':
8947 	case KEY_HOME:
8948 		s->first_displayed_line = 1;
8949 		view->count = 0;
8950 		break;
8951 	case 'G':
8952 	case KEY_END:
8953 		view->count = 0;
8954 		if (s->eof)
8955 			break;
8956 		s->first_displayed_line = (s->nlines - eos) + 3;
8957 		s->eof = 1;
8958 		break;
8959 	case 'k':
8960 	case KEY_UP:
8961 		if (s->first_displayed_line > 1)
8962 			--s->first_displayed_line;
8963 		else
8964 			view->count = 0;
8965 		break;
8966 	case CTRL('u'):
8967 	case 'u':
8968 		nscroll /= 2;
8969 		/* FALL THROUGH */
8970 	case KEY_PPAGE:
8971 	case CTRL('b'):
8972 	case 'b':
8973 		if (s->first_displayed_line == 1) {
8974 			view->count = 0;
8975 			break;
8976 		}
8977 		while (--nscroll > 0 && s->first_displayed_line > 1)
8978 			s->first_displayed_line--;
8979 		break;
8980 	case 'j':
8981 	case KEY_DOWN:
8982 	case CTRL('n'):
8983 		if (!s->eof)
8984 			++s->first_displayed_line;
8985 		else
8986 			view->count = 0;
8987 		break;
8988 	case CTRL('d'):
8989 	case 'd':
8990 		nscroll /= 2;
8991 		/* FALL THROUGH */
8992 	case KEY_NPAGE:
8993 	case CTRL('f'):
8994 	case 'f':
8995 	case ' ':
8996 		if (s->eof) {
8997 			view->count = 0;
8998 			break;
8999 		}
9000 		while (!s->eof && --nscroll > 0) {
9001 			linelen = getline(&line, &linesz, s->f);
9002 			s->first_displayed_line++;
9003 			if (linelen == -1) {
9004 				if (feof(s->f))
9005 					s->eof = 1;
9006 				else
9007 					err = got_ferror(s->f, GOT_ERR_IO);
9008 				break;
9009 			}
9010 		}
9011 		free(line);
9012 		break;
9013 	default:
9014 		view->count = 0;
9015 		break;
9016 	}
9017 
9018 	return err;
9019 }
9020 
9021 static const struct got_error *
9022 close_help_view(struct tog_view *view)
9023 {
9024 	struct tog_help_view_state *s = &view->state.help;
9025 
9026 	free(s->line_offsets);
9027 	s->line_offsets = NULL;
9028 	if (fclose(s->f) == EOF)
9029 		return got_error_from_errno("fclose");
9030 
9031 	return NULL;
9032 }
9033 
9034 static const struct got_error *
9035 reset_help_view(struct tog_view *view)
9036 {
9037 	struct tog_help_view_state *s = &view->state.help;
9038 
9039 
9040 	if (s->f && fclose(s->f) == EOF)
9041 		return got_error_from_errno("fclose");
9042 
9043 	wclear(view->window);
9044 	view->count = 0;
9045 	view->x = 0;
9046 	s->all = !s->all;
9047 	s->first_displayed_line = 1;
9048 	s->last_displayed_line = view->nlines;
9049 	s->matched_line = 0;
9050 
9051 	return create_help(s);
9052 }
9053 
9054 static const struct got_error *
9055 open_help_view(struct tog_view *view, struct tog_view *parent)
9056 {
9057 	const struct got_error		*err = NULL;
9058 	struct tog_help_view_state	*s = &view->state.help;
9059 
9060 	s->type = (enum tog_keymap_type)parent->type;
9061 	s->first_displayed_line = 1;
9062 	s->last_displayed_line = view->nlines;
9063 	s->selected_line = 1;
9064 
9065 	view->show = show_help_view;
9066 	view->input = input_help_view;
9067 	view->reset = reset_help_view;
9068 	view->close = close_help_view;
9069 	view->search_start = search_start_help_view;
9070 	view->search_setup = search_setup_help_view;
9071 	view->search_next = search_next_view_match;
9072 
9073 	err = create_help(s);
9074 	return err;
9075 }
9076 
9077 static const struct got_error *
9078 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9079     enum tog_view_type request, int y, int x)
9080 {
9081 	const struct got_error *err = NULL;
9082 
9083 	*new_view = NULL;
9084 
9085 	switch (request) {
9086 	case TOG_VIEW_DIFF:
9087 		if (view->type == TOG_VIEW_LOG) {
9088 			struct tog_log_view_state *s = &view->state.log;
9089 
9090 			err = open_diff_view_for_commit(new_view, y, x,
9091 			    s->selected_entry->commit, s->selected_entry->id,
9092 			    view, s->repo);
9093 		} else
9094 			return got_error_msg(GOT_ERR_NOT_IMPL,
9095 			    "parent/child view pair not supported");
9096 		break;
9097 	case TOG_VIEW_BLAME:
9098 		if (view->type == TOG_VIEW_TREE) {
9099 			struct tog_tree_view_state *s = &view->state.tree;
9100 
9101 			err = blame_tree_entry(new_view, y, x,
9102 			    s->selected_entry, &s->parents, s->commit_id,
9103 			    s->repo);
9104 		} else
9105 			return got_error_msg(GOT_ERR_NOT_IMPL,
9106 			    "parent/child view pair not supported");
9107 		break;
9108 	case TOG_VIEW_LOG:
9109 		if (view->type == TOG_VIEW_BLAME)
9110 			err = log_annotated_line(new_view, y, x,
9111 			    view->state.blame.repo, view->state.blame.id_to_log);
9112 		else if (view->type == TOG_VIEW_TREE)
9113 			err = log_selected_tree_entry(new_view, y, x,
9114 			    &view->state.tree);
9115 		else if (view->type == TOG_VIEW_REF)
9116 			err = log_ref_entry(new_view, y, x,
9117 			    view->state.ref.selected_entry,
9118 			    view->state.ref.repo);
9119 		else
9120 			return got_error_msg(GOT_ERR_NOT_IMPL,
9121 			    "parent/child view pair not supported");
9122 		break;
9123 	case TOG_VIEW_TREE:
9124 		if (view->type == TOG_VIEW_LOG)
9125 			err = browse_commit_tree(new_view, y, x,
9126 			    view->state.log.selected_entry,
9127 			    view->state.log.in_repo_path,
9128 			    view->state.log.head_ref_name,
9129 			    view->state.log.repo);
9130 		else if (view->type == TOG_VIEW_REF)
9131 			err = browse_ref_tree(new_view, y, x,
9132 			    view->state.ref.selected_entry,
9133 			    view->state.ref.repo);
9134 		else
9135 			return got_error_msg(GOT_ERR_NOT_IMPL,
9136 			    "parent/child view pair not supported");
9137 		break;
9138 	case TOG_VIEW_REF:
9139 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9140 		if (*new_view == NULL)
9141 			return got_error_from_errno("view_open");
9142 		if (view->type == TOG_VIEW_LOG)
9143 			err = open_ref_view(*new_view, view->state.log.repo);
9144 		else if (view->type == TOG_VIEW_TREE)
9145 			err = open_ref_view(*new_view, view->state.tree.repo);
9146 		else
9147 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9148 			    "parent/child view pair not supported");
9149 		if (err)
9150 			view_close(*new_view);
9151 		break;
9152 	case TOG_VIEW_HELP:
9153 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9154 		if (*new_view == NULL)
9155 			return got_error_from_errno("view_open");
9156 		err = open_help_view(*new_view, view);
9157 		if (err)
9158 			view_close(*new_view);
9159 		break;
9160 	default:
9161 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9162 	}
9163 
9164 	return err;
9165 }
9166 
9167 /*
9168  * If view was scrolled down to move the selected line into view when opening a
9169  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9170  */
9171 static void
9172 offset_selection_up(struct tog_view *view)
9173 {
9174 	switch (view->type) {
9175 	case TOG_VIEW_BLAME: {
9176 		struct tog_blame_view_state *s = &view->state.blame;
9177 		if (s->first_displayed_line == 1) {
9178 			s->selected_line = MAX(s->selected_line - view->offset,
9179 			    1);
9180 			break;
9181 		}
9182 		if (s->first_displayed_line > view->offset)
9183 			s->first_displayed_line -= view->offset;
9184 		else
9185 			s->first_displayed_line = 1;
9186 		s->selected_line += view->offset;
9187 		break;
9188 	}
9189 	case TOG_VIEW_LOG:
9190 		log_scroll_up(&view->state.log, view->offset);
9191 		view->state.log.selected += view->offset;
9192 		break;
9193 	case TOG_VIEW_REF:
9194 		ref_scroll_up(&view->state.ref, view->offset);
9195 		view->state.ref.selected += view->offset;
9196 		break;
9197 	case TOG_VIEW_TREE:
9198 		tree_scroll_up(&view->state.tree, view->offset);
9199 		view->state.tree.selected += view->offset;
9200 		break;
9201 	default:
9202 		break;
9203 	}
9204 
9205 	view->offset = 0;
9206 }
9207 
9208 /*
9209  * If the selected line is in the section of screen covered by the bottom split,
9210  * scroll down offset lines to move it into view and index its new position.
9211  */
9212 static const struct got_error *
9213 offset_selection_down(struct tog_view *view)
9214 {
9215 	const struct got_error	*err = NULL;
9216 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9217 	int			*selected = NULL;
9218 	int			 header, offset;
9219 
9220 	switch (view->type) {
9221 	case TOG_VIEW_BLAME: {
9222 		struct tog_blame_view_state *s = &view->state.blame;
9223 		header = 3;
9224 		scrolld = NULL;
9225 		if (s->selected_line > view->nlines - header) {
9226 			offset = abs(view->nlines - s->selected_line - header);
9227 			s->first_displayed_line += offset;
9228 			s->selected_line -= offset;
9229 			view->offset = offset;
9230 		}
9231 		break;
9232 	}
9233 	case TOG_VIEW_LOG: {
9234 		struct tog_log_view_state *s = &view->state.log;
9235 		scrolld = &log_scroll_down;
9236 		header = view_is_parent_view(view) ? 3 : 2;
9237 		selected = &s->selected;
9238 		break;
9239 	}
9240 	case TOG_VIEW_REF: {
9241 		struct tog_ref_view_state *s = &view->state.ref;
9242 		scrolld = &ref_scroll_down;
9243 		header = 3;
9244 		selected = &s->selected;
9245 		break;
9246 	}
9247 	case TOG_VIEW_TREE: {
9248 		struct tog_tree_view_state *s = &view->state.tree;
9249 		scrolld = &tree_scroll_down;
9250 		header = 5;
9251 		selected = &s->selected;
9252 		break;
9253 	}
9254 	default:
9255 		selected = NULL;
9256 		scrolld = NULL;
9257 		header = 0;
9258 		break;
9259 	}
9260 
9261 	if (selected && *selected > view->nlines - header) {
9262 		offset = abs(view->nlines - *selected - header);
9263 		view->offset = offset;
9264 		if (scrolld && offset) {
9265 			err = scrolld(view, offset);
9266 			*selected -= offset;
9267 		}
9268 	}
9269 
9270 	return err;
9271 }
9272 
9273 static void
9274 list_commands(FILE *fp)
9275 {
9276 	size_t i;
9277 
9278 	fprintf(fp, "commands:");
9279 	for (i = 0; i < nitems(tog_commands); i++) {
9280 		const struct tog_cmd *cmd = &tog_commands[i];
9281 		fprintf(fp, " %s", cmd->name);
9282 	}
9283 	fputc('\n', fp);
9284 }
9285 
9286 __dead static void
9287 usage(int hflag, int status)
9288 {
9289 	FILE *fp = (status == 0) ? stdout : stderr;
9290 
9291 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9292 	    getprogname());
9293 	if (hflag) {
9294 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9295 		list_commands(fp);
9296 	}
9297 	exit(status);
9298 }
9299 
9300 static char **
9301 make_argv(int argc, ...)
9302 {
9303 	va_list ap;
9304 	char **argv;
9305 	int i;
9306 
9307 	va_start(ap, argc);
9308 
9309 	argv = calloc(argc, sizeof(char *));
9310 	if (argv == NULL)
9311 		err(1, "calloc");
9312 	for (i = 0; i < argc; i++) {
9313 		argv[i] = strdup(va_arg(ap, char *));
9314 		if (argv[i] == NULL)
9315 			err(1, "strdup");
9316 	}
9317 
9318 	va_end(ap);
9319 	return argv;
9320 }
9321 
9322 /*
9323  * Try to convert 'tog path' into a 'tog log path' command.
9324  * The user could simply have mistyped the command rather than knowingly
9325  * provided a path. So check whether argv[0] can in fact be resolved
9326  * to a path in the HEAD commit and print a special error if not.
9327  * This hack is for mpi@ <3
9328  */
9329 static const struct got_error *
9330 tog_log_with_path(int argc, char *argv[])
9331 {
9332 	const struct got_error *error = NULL, *close_err;
9333 	const struct tog_cmd *cmd = NULL;
9334 	struct got_repository *repo = NULL;
9335 	struct got_worktree *worktree = NULL;
9336 	struct got_object_id *commit_id = NULL, *id = NULL;
9337 	struct got_commit_object *commit = NULL;
9338 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9339 	char *commit_id_str = NULL, **cmd_argv = NULL;
9340 	int *pack_fds = NULL;
9341 
9342 	cwd = getcwd(NULL, 0);
9343 	if (cwd == NULL)
9344 		return got_error_from_errno("getcwd");
9345 
9346 	error = got_repo_pack_fds_open(&pack_fds);
9347 	if (error != NULL)
9348 		goto done;
9349 
9350 	error = got_worktree_open(&worktree, cwd);
9351 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9352 		goto done;
9353 
9354 	if (worktree)
9355 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9356 	else
9357 		repo_path = strdup(cwd);
9358 	if (repo_path == NULL) {
9359 		error = got_error_from_errno("strdup");
9360 		goto done;
9361 	}
9362 
9363 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9364 	if (error != NULL)
9365 		goto done;
9366 
9367 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9368 	    repo, worktree);
9369 	if (error)
9370 		goto done;
9371 
9372 	error = tog_load_refs(repo, 0);
9373 	if (error)
9374 		goto done;
9375 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9376 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9377 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9378 	if (error)
9379 		goto done;
9380 
9381 	if (worktree) {
9382 		got_worktree_close(worktree);
9383 		worktree = NULL;
9384 	}
9385 
9386 	error = got_object_open_as_commit(&commit, repo, commit_id);
9387 	if (error)
9388 		goto done;
9389 
9390 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9391 	if (error) {
9392 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9393 			goto done;
9394 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9395 		    getprogname(), argv[0]);
9396 		usage(1, 1);
9397 		/* not reached */
9398 	}
9399 
9400 	error = got_object_id_str(&commit_id_str, commit_id);
9401 	if (error)
9402 		goto done;
9403 
9404 	cmd = &tog_commands[0]; /* log */
9405 	argc = 4;
9406 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9407 	error = cmd->cmd_main(argc, cmd_argv);
9408 done:
9409 	if (repo) {
9410 		close_err = got_repo_close(repo);
9411 		if (error == NULL)
9412 			error = close_err;
9413 	}
9414 	if (commit)
9415 		got_object_commit_close(commit);
9416 	if (worktree)
9417 		got_worktree_close(worktree);
9418 	if (pack_fds) {
9419 		const struct got_error *pack_err =
9420 		    got_repo_pack_fds_close(pack_fds);
9421 		if (error == NULL)
9422 			error = pack_err;
9423 	}
9424 	free(id);
9425 	free(commit_id_str);
9426 	free(commit_id);
9427 	free(cwd);
9428 	free(repo_path);
9429 	free(in_repo_path);
9430 	if (cmd_argv) {
9431 		int i;
9432 		for (i = 0; i < argc; i++)
9433 			free(cmd_argv[i]);
9434 		free(cmd_argv);
9435 	}
9436 	tog_free_refs();
9437 	return error;
9438 }
9439 
9440 int
9441 main(int argc, char *argv[])
9442 {
9443 	const struct got_error *error = NULL;
9444 	const struct tog_cmd *cmd = NULL;
9445 	int ch, hflag = 0, Vflag = 0;
9446 	char **cmd_argv = NULL;
9447 	static const struct option longopts[] = {
9448 	    { "version", no_argument, NULL, 'V' },
9449 	    { NULL, 0, NULL, 0}
9450 	};
9451 	char *diff_algo_str = NULL;
9452 
9453 	if (!isatty(STDIN_FILENO))
9454 		errx(1, "standard input is not a tty");
9455 
9456 	setlocale(LC_CTYPE, "");
9457 
9458 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9459 		switch (ch) {
9460 		case 'h':
9461 			hflag = 1;
9462 			break;
9463 		case 'V':
9464 			Vflag = 1;
9465 			break;
9466 		default:
9467 			usage(hflag, 1);
9468 			/* NOTREACHED */
9469 		}
9470 	}
9471 
9472 	argc -= optind;
9473 	argv += optind;
9474 	optind = 1;
9475 	optreset = 1;
9476 
9477 	if (Vflag) {
9478 		got_version_print_str();
9479 		return 0;
9480 	}
9481 
9482 #ifndef PROFILE
9483 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9484 	    NULL) == -1)
9485 		err(1, "pledge");
9486 #endif
9487 
9488 	if (argc == 0) {
9489 		if (hflag)
9490 			usage(hflag, 0);
9491 		/* Build an argument vector which runs a default command. */
9492 		cmd = &tog_commands[0];
9493 		argc = 1;
9494 		cmd_argv = make_argv(argc, cmd->name);
9495 	} else {
9496 		size_t i;
9497 
9498 		/* Did the user specify a command? */
9499 		for (i = 0; i < nitems(tog_commands); i++) {
9500 			if (strncmp(tog_commands[i].name, argv[0],
9501 			    strlen(argv[0])) == 0) {
9502 				cmd = &tog_commands[i];
9503 				break;
9504 			}
9505 		}
9506 	}
9507 
9508 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9509 	if (diff_algo_str) {
9510 		if (strcasecmp(diff_algo_str, "patience") == 0)
9511 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9512 		if (strcasecmp(diff_algo_str, "myers") == 0)
9513 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9514 	}
9515 
9516 	if (cmd == NULL) {
9517 		if (argc != 1)
9518 			usage(0, 1);
9519 		/* No command specified; try log with a path */
9520 		error = tog_log_with_path(argc, argv);
9521 	} else {
9522 		if (hflag)
9523 			cmd->cmd_usage();
9524 		else
9525 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9526 	}
9527 
9528 	endwin();
9529 	if (cmd_argv) {
9530 		int i;
9531 		for (i = 0; i < argc; i++)
9532 			free(cmd_argv[i]);
9533 		free(cmd_argv);
9534 	}
9535 
9536 	if (error && error->code != GOT_ERR_CANCELLED &&
9537 	    error->code != GOT_ERR_EOF &&
9538 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9539 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9540 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9541 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9542 	return 0;
9543 }