1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 };
440 
441 struct tog_blame {
442 	FILE *f;
443 	off_t filesize;
444 	struct tog_blame_line *lines;
445 	int nlines;
446 	off_t *line_offsets;
447 	pthread_t thread;
448 	struct tog_blame_thread_args thread_args;
449 	struct tog_blame_cb_args cb_args;
450 	const char *path;
451 	int *pack_fds;
452 };
453 
454 struct tog_blame_view_state {
455 	int first_displayed_line;
456 	int last_displayed_line;
457 	int selected_line;
458 	int last_diffed_line;
459 	int blame_complete;
460 	int eof;
461 	int done;
462 	struct got_object_id_queue blamed_commits;
463 	struct got_object_qid *blamed_commit;
464 	char *path;
465 	struct got_repository *repo;
466 	struct got_object_id *commit_id;
467 	struct got_object_id *id_to_log;
468 	struct tog_blame blame;
469 	int matched_line;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_parent_tree {
474 	TAILQ_ENTRY(tog_parent_tree) entry;
475 	struct got_tree_object *tree;
476 	struct got_tree_entry *first_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int selected;
479 };
480 
481 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
482 
483 struct tog_tree_view_state {
484 	char *tree_label;
485 	struct got_object_id *commit_id;/* commit which this tree belongs to */
486 	struct got_tree_object *root;	/* the commit's root tree entry */
487 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
488 	struct got_tree_entry *first_displayed_entry;
489 	struct got_tree_entry *last_displayed_entry;
490 	struct got_tree_entry *selected_entry;
491 	int ndisplayed, selected, show_ids;
492 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
493 	char *head_ref_name;
494 	struct got_repository *repo;
495 	struct got_tree_entry *matched_entry;
496 	struct tog_colors colors;
497 };
498 
499 struct tog_reflist_entry {
500 	TAILQ_ENTRY(tog_reflist_entry) entry;
501 	struct got_reference *ref;
502 	int idx;
503 };
504 
505 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
506 
507 struct tog_ref_view_state {
508 	struct tog_reflist_head refs;
509 	struct tog_reflist_entry *first_displayed_entry;
510 	struct tog_reflist_entry *last_displayed_entry;
511 	struct tog_reflist_entry *selected_entry;
512 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
513 	struct got_repository *repo;
514 	struct tog_reflist_entry *matched_entry;
515 	struct tog_colors colors;
516 };
517 
518 struct tog_help_view_state {
519 	FILE			*f;
520 	off_t			*line_offsets;
521 	size_t			 nlines;
522 	int			 lineno;
523 	int			 first_displayed_line;
524 	int			 last_displayed_line;
525 	int			 eof;
526 	int			 matched_line;
527 	int			 selected_line;
528 	int			 all;
529 	enum tog_keymap_type	 type;
530 };
531 
532 #define GENERATE_HELP \
533 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
534 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
535 	KEY_("k C-p Up", "Move cursor or page up one line"), \
536 	KEY_("j C-n Down", "Move cursor or page down one line"), \
537 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
538 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
539 	KEY_("C-u u", "Scroll the view up one half page"), \
540 	KEY_("C-d d", "Scroll the view down one half page"), \
541 	KEY_("g", "Go to line N (default: first line)"), \
542 	KEY_("Home =", "Go to the first line"), \
543 	KEY_("G", "Go to line N (default: last line)"), \
544 	KEY_("End *", "Go to the last line"), \
545 	KEY_("l Right", "Scroll the view right"), \
546 	KEY_("h Left", "Scroll the view left"), \
547 	KEY_("$", "Scroll view to the rightmost position"), \
548 	KEY_("0", "Scroll view to the leftmost position"), \
549 	KEY_("-", "Decrease size of the focussed split"), \
550 	KEY_("+", "Increase size of the focussed split"), \
551 	KEY_("Tab", "Switch focus between views"), \
552 	KEY_("F", "Toggle fullscreen mode"), \
553 	KEY_("/", "Open prompt to enter search term"), \
554 	KEY_("n", "Find next line/token matching the current search term"), \
555 	KEY_("N", "Find previous line/token matching the current search term"),\
556 	KEY_("q", "Quit the focussed view; Quit help screen"), \
557 	KEY_("Q", "Quit tog"), \
558 	\
559 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
560 	KEY_("< ,", "Move cursor up one commit"), \
561 	KEY_("> .", "Move cursor down one commit"), \
562 	KEY_("Enter", "Open diff view of the selected commit"), \
563 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
564 	KEY_("R", "Open ref view of all repository references"), \
565 	KEY_("T", "Display tree view of the repository from the selected" \
566 	    " commit"), \
567 	KEY_("@", "Toggle between displaying author and committer name"), \
568 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
569 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
570 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
571 	\
572 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
573 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
574 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
575 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
576 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
577 	    " data"), \
578 	KEY_("(", "Go to the previous file in the diff"), \
579 	KEY_(")", "Go to the next file in the diff"), \
580 	KEY_("{", "Go to the previous hunk in the diff"), \
581 	KEY_("}", "Go to the next hunk in the diff"), \
582 	KEY_("[", "Decrease the number of context lines"), \
583 	KEY_("]", "Increase the number of context lines"), \
584 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
585 	\
586 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
587 	KEY_("Enter", "Display diff view of the selected line's commit"), \
588 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
589 	KEY_("L", "Open log view for the currently selected annotated line"), \
590 	KEY_("C", "Reload view with the previously blamed commit"), \
591 	KEY_("c", "Reload view with the version of the file found in the" \
592 	    " selected line's commit"), \
593 	KEY_("p", "Reload view with the version of the file found in the" \
594 	    " selected line's parent commit"), \
595 	\
596 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
597 	KEY_("Enter", "Enter selected directory or open blame view of the" \
598 	    " selected file"), \
599 	KEY_("L", "Open log view for the selected entry"), \
600 	KEY_("R", "Open ref view of all repository references"), \
601 	KEY_("i", "Show object IDs for all tree entries"), \
602 	KEY_("Backspace", "Return to the parent directory"), \
603 	\
604 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
605 	KEY_("Enter", "Display log view of the selected reference"), \
606 	KEY_("T", "Display tree view of the selected reference"), \
607 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
608 	KEY_("m", "Toggle display of last modified date for each reference"), \
609 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
610 	KEY_("C-l", "Reload view with all repository references")
611 
612 struct tog_key_map {
613 	const char		*keys;
614 	const char		*info;
615 	enum tog_keymap_type	 type;
616 };
617 
618 /*
619  * We implement two types of views: parent views and child views.
620  *
621  * The 'Tab' key switches focus between a parent view and its child view.
622  * Child views are shown side-by-side to their parent view, provided
623  * there is enough screen estate.
624  *
625  * When a new view is opened from within a parent view, this new view
626  * becomes a child view of the parent view, replacing any existing child.
627  *
628  * When a new view is opened from within a child view, this new view
629  * becomes a parent view which will obscure the views below until the
630  * user quits the new parent view by typing 'q'.
631  *
632  * This list of views contains parent views only.
633  * Child views are only pointed to by their parent view.
634  */
635 TAILQ_HEAD(tog_view_list_head, tog_view);
636 
637 struct tog_view {
638 	TAILQ_ENTRY(tog_view) entry;
639 	WINDOW *window;
640 	PANEL *panel;
641 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
642 	int resized_y, resized_x; /* begin_y/x based on user resizing */
643 	int maxx, x; /* max column and current start column */
644 	int lines, cols; /* copies of LINES and COLS */
645 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
646 	int gline, hiline; /* navigate to and highlight this nG line */
647 	int ch, count; /* current keymap and count prefix */
648 	int resized; /* set when in a resize event */
649 	int focussed; /* Only set on one parent or child view at a time. */
650 	int dying;
651 	struct tog_view *parent;
652 	struct tog_view *child;
653 
654 	/*
655 	 * This flag is initially set on parent views when a new child view
656 	 * is created. It gets toggled when the 'Tab' key switches focus
657 	 * between parent and child.
658 	 * The flag indicates whether focus should be passed on to our child
659 	 * view if this parent view gets picked for focus after another parent
660 	 * view was closed. This prevents child views from losing focus in such
661 	 * situations.
662 	 */
663 	int focus_child;
664 
665 	enum tog_view_mode mode;
666 	/* type-specific state */
667 	enum tog_view_type type;
668 	union {
669 		struct tog_diff_view_state diff;
670 		struct tog_log_view_state log;
671 		struct tog_blame_view_state blame;
672 		struct tog_tree_view_state tree;
673 		struct tog_ref_view_state ref;
674 		struct tog_help_view_state help;
675 	} state;
676 
677 	const struct got_error *(*show)(struct tog_view *);
678 	const struct got_error *(*input)(struct tog_view **,
679 	    struct tog_view *, int);
680 	const struct got_error *(*reset)(struct tog_view *);
681 	const struct got_error *(*resize)(struct tog_view *, int);
682 	const struct got_error *(*close)(struct tog_view *);
683 
684 	const struct got_error *(*search_start)(struct tog_view *);
685 	const struct got_error *(*search_next)(struct tog_view *);
686 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
687 	    int **, int **, int **, int **);
688 	int search_started;
689 	int searching;
690 #define TOG_SEARCH_FORWARD	1
691 #define TOG_SEARCH_BACKWARD	2
692 	int search_next_done;
693 #define TOG_SEARCH_HAVE_MORE	1
694 #define TOG_SEARCH_NO_MORE	2
695 #define TOG_SEARCH_HAVE_NONE	3
696 	regex_t regex;
697 	regmatch_t regmatch;
698 	const char *action;
699 };
700 
701 static const struct got_error *open_diff_view(struct tog_view *,
702     struct got_object_id *, struct got_object_id *,
703     const char *, const char *, int, int, int, struct tog_view *,
704     struct got_repository *);
705 static const struct got_error *show_diff_view(struct tog_view *);
706 static const struct got_error *input_diff_view(struct tog_view **,
707     struct tog_view *, int);
708 static const struct got_error *reset_diff_view(struct tog_view *);
709 static const struct got_error* close_diff_view(struct tog_view *);
710 static const struct got_error *search_start_diff_view(struct tog_view *);
711 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
712     size_t *, int **, int **, int **, int **);
713 static const struct got_error *search_next_view_match(struct tog_view *);
714 
715 static const struct got_error *open_log_view(struct tog_view *,
716     struct got_object_id *, struct got_repository *,
717     const char *, const char *, int);
718 static const struct got_error * show_log_view(struct tog_view *);
719 static const struct got_error *input_log_view(struct tog_view **,
720     struct tog_view *, int);
721 static const struct got_error *resize_log_view(struct tog_view *, int);
722 static const struct got_error *close_log_view(struct tog_view *);
723 static const struct got_error *search_start_log_view(struct tog_view *);
724 static const struct got_error *search_next_log_view(struct tog_view *);
725 
726 static const struct got_error *open_blame_view(struct tog_view *, char *,
727     struct got_object_id *, struct got_repository *);
728 static const struct got_error *show_blame_view(struct tog_view *);
729 static const struct got_error *input_blame_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *reset_blame_view(struct tog_view *);
732 static const struct got_error *close_blame_view(struct tog_view *);
733 static const struct got_error *search_start_blame_view(struct tog_view *);
734 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
735     size_t *, int **, int **, int **, int **);
736 
737 static const struct got_error *open_tree_view(struct tog_view *,
738     struct got_object_id *, const char *, struct got_repository *);
739 static const struct got_error *show_tree_view(struct tog_view *);
740 static const struct got_error *input_tree_view(struct tog_view **,
741     struct tog_view *, int);
742 static const struct got_error *close_tree_view(struct tog_view *);
743 static const struct got_error *search_start_tree_view(struct tog_view *);
744 static const struct got_error *search_next_tree_view(struct tog_view *);
745 
746 static const struct got_error *open_ref_view(struct tog_view *,
747     struct got_repository *);
748 static const struct got_error *show_ref_view(struct tog_view *);
749 static const struct got_error *input_ref_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *close_ref_view(struct tog_view *);
752 static const struct got_error *search_start_ref_view(struct tog_view *);
753 static const struct got_error *search_next_ref_view(struct tog_view *);
754 
755 static const struct got_error *open_help_view(struct tog_view *,
756     struct tog_view *);
757 static const struct got_error *show_help_view(struct tog_view *);
758 static const struct got_error *input_help_view(struct tog_view **,
759     struct tog_view *, int);
760 static const struct got_error *reset_help_view(struct tog_view *);
761 static const struct got_error* close_help_view(struct tog_view *);
762 static const struct got_error *search_start_help_view(struct tog_view *);
763 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
764     size_t *, int **, int **, int **, int **);
765 
766 static volatile sig_atomic_t tog_sigwinch_received;
767 static volatile sig_atomic_t tog_sigpipe_received;
768 static volatile sig_atomic_t tog_sigcont_received;
769 static volatile sig_atomic_t tog_sigint_received;
770 static volatile sig_atomic_t tog_sigterm_received;
771 
772 static void
773 tog_sigwinch(int signo)
774 {
775 	tog_sigwinch_received = 1;
776 }
777 
778 static void
779 tog_sigpipe(int signo)
780 {
781 	tog_sigpipe_received = 1;
782 }
783 
784 static void
785 tog_sigcont(int signo)
786 {
787 	tog_sigcont_received = 1;
788 }
789 
790 static void
791 tog_sigint(int signo)
792 {
793 	tog_sigint_received = 1;
794 }
795 
796 static void
797 tog_sigterm(int signo)
798 {
799 	tog_sigterm_received = 1;
800 }
801 
802 static int
803 tog_fatal_signal_received(void)
804 {
805 	return (tog_sigpipe_received ||
806 	    tog_sigint_received || tog_sigterm_received);
807 }
808 
809 static const struct got_error *
810 view_close(struct tog_view *view)
811 {
812 	const struct got_error *err = NULL, *child_err = NULL;
813 
814 	if (view->child) {
815 		child_err = view_close(view->child);
816 		view->child = NULL;
817 	}
818 	if (view->close)
819 		err = view->close(view);
820 	if (view->panel)
821 		del_panel(view->panel);
822 	if (view->window)
823 		delwin(view->window);
824 	free(view);
825 	return err ? err : child_err;
826 }
827 
828 static struct tog_view *
829 view_open(int nlines, int ncols, int begin_y, int begin_x,
830     enum tog_view_type type)
831 {
832 	struct tog_view *view = calloc(1, sizeof(*view));
833 
834 	if (view == NULL)
835 		return NULL;
836 
837 	view->type = type;
838 	view->lines = LINES;
839 	view->cols = COLS;
840 	view->nlines = nlines ? nlines : LINES - begin_y;
841 	view->ncols = ncols ? ncols : COLS - begin_x;
842 	view->begin_y = begin_y;
843 	view->begin_x = begin_x;
844 	view->window = newwin(nlines, ncols, begin_y, begin_x);
845 	if (view->window == NULL) {
846 		view_close(view);
847 		return NULL;
848 	}
849 	view->panel = new_panel(view->window);
850 	if (view->panel == NULL ||
851 	    set_panel_userptr(view->panel, view) != OK) {
852 		view_close(view);
853 		return NULL;
854 	}
855 
856 	keypad(view->window, TRUE);
857 	return view;
858 }
859 
860 static int
861 view_split_begin_x(int begin_x)
862 {
863 	if (begin_x > 0 || COLS < 120)
864 		return 0;
865 	return (COLS - MAX(COLS / 2, 80));
866 }
867 
868 /* XXX Stub till we decide what to do. */
869 static int
870 view_split_begin_y(int lines)
871 {
872 	return lines * HSPLIT_SCALE;
873 }
874 
875 static const struct got_error *view_resize(struct tog_view *);
876 
877 static const struct got_error *
878 view_splitscreen(struct tog_view *view)
879 {
880 	const struct got_error *err = NULL;
881 
882 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
883 		if (view->resized_y && view->resized_y < view->lines)
884 			view->begin_y = view->resized_y;
885 		else
886 			view->begin_y = view_split_begin_y(view->nlines);
887 		view->begin_x = 0;
888 	} else if (!view->resized) {
889 		if (view->resized_x && view->resized_x < view->cols - 1 &&
890 		    view->cols > 119)
891 			view->begin_x = view->resized_x;
892 		else
893 			view->begin_x = view_split_begin_x(0);
894 		view->begin_y = 0;
895 	}
896 	view->nlines = LINES - view->begin_y;
897 	view->ncols = COLS - view->begin_x;
898 	view->lines = LINES;
899 	view->cols = COLS;
900 	err = view_resize(view);
901 	if (err)
902 		return err;
903 
904 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
905 		view->parent->nlines = view->begin_y;
906 
907 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
908 		return got_error_from_errno("mvwin");
909 
910 	return NULL;
911 }
912 
913 static const struct got_error *
914 view_fullscreen(struct tog_view *view)
915 {
916 	const struct got_error *err = NULL;
917 
918 	view->begin_x = 0;
919 	view->begin_y = view->resized ? view->begin_y : 0;
920 	view->nlines = view->resized ? view->nlines : LINES;
921 	view->ncols = COLS;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 	err = view_resize(view);
925 	if (err)
926 		return err;
927 
928 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
929 		return got_error_from_errno("mvwin");
930 
931 	return NULL;
932 }
933 
934 static int
935 view_is_parent_view(struct tog_view *view)
936 {
937 	return view->parent == NULL;
938 }
939 
940 static int
941 view_is_splitscreen(struct tog_view *view)
942 {
943 	return view->begin_x > 0 || view->begin_y > 0;
944 }
945 
946 static int
947 view_is_fullscreen(struct tog_view *view)
948 {
949 	return view->nlines == LINES && view->ncols == COLS;
950 }
951 
952 static int
953 view_is_hsplit_top(struct tog_view *view)
954 {
955 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
956 	    view_is_splitscreen(view->child);
957 }
958 
959 static void
960 view_border(struct tog_view *view)
961 {
962 	PANEL *panel;
963 	const struct tog_view *view_above;
964 
965 	if (view->parent)
966 		return view_border(view->parent);
967 
968 	panel = panel_above(view->panel);
969 	if (panel == NULL)
970 		return;
971 
972 	view_above = panel_userptr(panel);
973 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
974 		mvwhline(view->window, view_above->begin_y - 1,
975 		    view->begin_x, got_locale_is_utf8() ?
976 		    ACS_HLINE : '-', view->ncols);
977 	else
978 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
979 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
980 }
981 
982 static const struct got_error *view_init_hsplit(struct tog_view *, int);
983 static const struct got_error *request_log_commits(struct tog_view *);
984 static const struct got_error *offset_selection_down(struct tog_view *);
985 static void offset_selection_up(struct tog_view *);
986 static void view_get_split(struct tog_view *, int *, int *);
987 
988 static const struct got_error *
989 view_resize(struct tog_view *view)
990 {
991 	const struct got_error	*err = NULL;
992 	int			 dif, nlines, ncols;
993 
994 	dif = LINES - view->lines;  /* line difference */
995 
996 	if (view->lines > LINES)
997 		nlines = view->nlines - (view->lines - LINES);
998 	else
999 		nlines = view->nlines + (LINES - view->lines);
1000 	if (view->cols > COLS)
1001 		ncols = view->ncols - (view->cols - COLS);
1002 	else
1003 		ncols = view->ncols + (COLS - view->cols);
1004 
1005 	if (view->child) {
1006 		int hs = view->child->begin_y;
1007 
1008 		if (!view_is_fullscreen(view))
1009 			view->child->begin_x = view_split_begin_x(view->begin_x);
1010 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1011 		    view->child->begin_x == 0) {
1012 			ncols = COLS;
1013 
1014 			view_fullscreen(view->child);
1015 			if (view->child->focussed)
1016 				show_panel(view->child->panel);
1017 			else
1018 				show_panel(view->panel);
1019 		} else {
1020 			ncols = view->child->begin_x;
1021 
1022 			view_splitscreen(view->child);
1023 			show_panel(view->child->panel);
1024 		}
1025 		/*
1026 		 * XXX This is ugly and needs to be moved into the above
1027 		 * logic but "works" for now and my attempts at moving it
1028 		 * break either 'tab' or 'F' key maps in horizontal splits.
1029 		 */
1030 		if (hs) {
1031 			err = view_splitscreen(view->child);
1032 			if (err)
1033 				return err;
1034 			if (dif < 0) { /* top split decreased */
1035 				err = offset_selection_down(view);
1036 				if (err)
1037 					return err;
1038 			}
1039 			view_border(view);
1040 			update_panels();
1041 			doupdate();
1042 			show_panel(view->child->panel);
1043 			nlines = view->nlines;
1044 		}
1045 	} else if (view->parent == NULL)
1046 		ncols = COLS;
1047 
1048 	if (view->resize && dif > 0) {
1049 		err = view->resize(view, dif);
1050 		if (err)
1051 			return err;
1052 	}
1053 
1054 	if (wresize(view->window, nlines, ncols) == ERR)
1055 		return got_error_from_errno("wresize");
1056 	if (replace_panel(view->panel, view->window) == ERR)
1057 		return got_error_from_errno("replace_panel");
1058 	wclear(view->window);
1059 
1060 	view->nlines = nlines;
1061 	view->ncols = ncols;
1062 	view->lines = LINES;
1063 	view->cols = COLS;
1064 
1065 	return NULL;
1066 }
1067 
1068 static const struct got_error *
1069 resize_log_view(struct tog_view *view, int increase)
1070 {
1071 	struct tog_log_view_state	*s = &view->state.log;
1072 	const struct got_error		*err = NULL;
1073 	int				 n = 0;
1074 
1075 	if (s->selected_entry)
1076 		n = s->selected_entry->idx + view->lines - s->selected;
1077 
1078 	/*
1079 	 * Request commits to account for the increased
1080 	 * height so we have enough to populate the view.
1081 	 */
1082 	if (s->commits->ncommits < n) {
1083 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1084 		err = request_log_commits(view);
1085 	}
1086 
1087 	return err;
1088 }
1089 
1090 static void
1091 view_adjust_offset(struct tog_view *view, int n)
1092 {
1093 	if (n == 0)
1094 		return;
1095 
1096 	if (view->parent && view->parent->offset) {
1097 		if (view->parent->offset + n >= 0)
1098 			view->parent->offset += n;
1099 		else
1100 			view->parent->offset = 0;
1101 	} else if (view->offset) {
1102 		if (view->offset - n >= 0)
1103 			view->offset -= n;
1104 		else
1105 			view->offset = 0;
1106 	}
1107 }
1108 
1109 static const struct got_error *
1110 view_resize_split(struct tog_view *view, int resize)
1111 {
1112 	const struct got_error	*err = NULL;
1113 	struct tog_view		*v = NULL;
1114 
1115 	if (view->parent)
1116 		v = view->parent;
1117 	else
1118 		v = view;
1119 
1120 	if (!v->child || !view_is_splitscreen(v->child))
1121 		return NULL;
1122 
1123 	v->resized = v->child->resized = resize;  /* lock for resize event */
1124 
1125 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1126 		if (v->child->resized_y)
1127 			v->child->begin_y = v->child->resized_y;
1128 		if (view->parent)
1129 			v->child->begin_y -= resize;
1130 		else
1131 			v->child->begin_y += resize;
1132 		if (v->child->begin_y < 3) {
1133 			view->count = 0;
1134 			v->child->begin_y = 3;
1135 		} else if (v->child->begin_y > LINES - 1) {
1136 			view->count = 0;
1137 			v->child->begin_y = LINES - 1;
1138 		}
1139 		v->ncols = COLS;
1140 		v->child->ncols = COLS;
1141 		view_adjust_offset(view, resize);
1142 		err = view_init_hsplit(v, v->child->begin_y);
1143 		if (err)
1144 			return err;
1145 		v->child->resized_y = v->child->begin_y;
1146 	} else {
1147 		if (v->child->resized_x)
1148 			v->child->begin_x = v->child->resized_x;
1149 		if (view->parent)
1150 			v->child->begin_x -= resize;
1151 		else
1152 			v->child->begin_x += resize;
1153 		if (v->child->begin_x < 11) {
1154 			view->count = 0;
1155 			v->child->begin_x = 11;
1156 		} else if (v->child->begin_x > COLS - 1) {
1157 			view->count = 0;
1158 			v->child->begin_x = COLS - 1;
1159 		}
1160 		v->child->resized_x = v->child->begin_x;
1161 	}
1162 
1163 	v->child->mode = v->mode;
1164 	v->child->nlines = v->lines - v->child->begin_y;
1165 	v->child->ncols = v->cols - v->child->begin_x;
1166 	v->focus_child = 1;
1167 
1168 	err = view_fullscreen(v);
1169 	if (err)
1170 		return err;
1171 	err = view_splitscreen(v->child);
1172 	if (err)
1173 		return err;
1174 
1175 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1176 		err = offset_selection_down(v->child);
1177 		if (err)
1178 			return err;
1179 	}
1180 
1181 	if (v->resize)
1182 		err = v->resize(v, 0);
1183 	else if (v->child->resize)
1184 		err = v->child->resize(v->child, 0);
1185 
1186 	v->resized = v->child->resized = 0;
1187 
1188 	return err;
1189 }
1190 
1191 static void
1192 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1193 {
1194 	struct tog_view *v = src->child ? src->child : src;
1195 
1196 	dst->resized_x = v->resized_x;
1197 	dst->resized_y = v->resized_y;
1198 }
1199 
1200 static const struct got_error *
1201 view_close_child(struct tog_view *view)
1202 {
1203 	const struct got_error *err = NULL;
1204 
1205 	if (view->child == NULL)
1206 		return NULL;
1207 
1208 	err = view_close(view->child);
1209 	view->child = NULL;
1210 	return err;
1211 }
1212 
1213 static const struct got_error *
1214 view_set_child(struct tog_view *view, struct tog_view *child)
1215 {
1216 	const struct got_error *err = NULL;
1217 
1218 	view->child = child;
1219 	child->parent = view;
1220 
1221 	err = view_resize(view);
1222 	if (err)
1223 		return err;
1224 
1225 	if (view->child->resized_x || view->child->resized_y)
1226 		err = view_resize_split(view, 0);
1227 
1228 	return err;
1229 }
1230 
1231 static const struct got_error *view_dispatch_request(struct tog_view **,
1232     struct tog_view *, enum tog_view_type, int, int);
1233 
1234 static const struct got_error *
1235 view_request_new(struct tog_view **requested, struct tog_view *view,
1236     enum tog_view_type request)
1237 {
1238 	struct tog_view		*new_view = NULL;
1239 	const struct got_error	*err;
1240 	int			 y = 0, x = 0;
1241 
1242 	*requested = NULL;
1243 
1244 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1245 		view_get_split(view, &y, &x);
1246 
1247 	err = view_dispatch_request(&new_view, view, request, y, x);
1248 	if (err)
1249 		return err;
1250 
1251 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1252 	    request != TOG_VIEW_HELP) {
1253 		err = view_init_hsplit(view, y);
1254 		if (err)
1255 			return err;
1256 	}
1257 
1258 	view->focussed = 0;
1259 	new_view->focussed = 1;
1260 	new_view->mode = view->mode;
1261 	new_view->nlines = request == TOG_VIEW_HELP ?
1262 	    view->lines : view->lines - y;
1263 
1264 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1265 		view_transfer_size(new_view, view);
1266 		err = view_close_child(view);
1267 		if (err)
1268 			return err;
1269 		err = view_set_child(view, new_view);
1270 		if (err)
1271 			return err;
1272 		view->focus_child = 1;
1273 	} else
1274 		*requested = new_view;
1275 
1276 	return NULL;
1277 }
1278 
1279 static void
1280 tog_resizeterm(void)
1281 {
1282 	int cols, lines;
1283 	struct winsize size;
1284 
1285 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1286 		cols = 80;     /* Default */
1287 		lines = 24;
1288 	} else {
1289 		cols = size.ws_col;
1290 		lines = size.ws_row;
1291 	}
1292 	resize_term(lines, cols);
1293 }
1294 
1295 static const struct got_error *
1296 view_search_start(struct tog_view *view)
1297 {
1298 	const struct got_error *err = NULL;
1299 	struct tog_view *v = view;
1300 	char pattern[1024];
1301 	int ret;
1302 
1303 	if (view->search_started) {
1304 		regfree(&view->regex);
1305 		view->searching = 0;
1306 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1307 	}
1308 	view->search_started = 0;
1309 
1310 	if (view->nlines < 1)
1311 		return NULL;
1312 
1313 	if (view_is_hsplit_top(view))
1314 		v = view->child;
1315 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1316 		v = view->parent;
1317 
1318 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1319 	wclrtoeol(v->window);
1320 
1321 	nodelay(v->window, FALSE);  /* block for search term input */
1322 	nocbreak();
1323 	echo();
1324 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1325 	wrefresh(v->window);
1326 	cbreak();
1327 	noecho();
1328 	nodelay(v->window, TRUE);
1329 	if (ret == ERR)
1330 		return NULL;
1331 
1332 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1333 		err = view->search_start(view);
1334 		if (err) {
1335 			regfree(&view->regex);
1336 			return err;
1337 		}
1338 		view->search_started = 1;
1339 		view->searching = TOG_SEARCH_FORWARD;
1340 		view->search_next_done = 0;
1341 		view->search_next(view);
1342 	}
1343 
1344 	return NULL;
1345 }
1346 
1347 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1348 static const struct got_error *
1349 switch_split(struct tog_view *view)
1350 {
1351 	const struct got_error	*err = NULL;
1352 	struct tog_view		*v = NULL;
1353 
1354 	if (view->parent)
1355 		v = view->parent;
1356 	else
1357 		v = view;
1358 
1359 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1360 		v->mode = TOG_VIEW_SPLIT_VERT;
1361 	else
1362 		v->mode = TOG_VIEW_SPLIT_HRZN;
1363 
1364 	if (!v->child)
1365 		return NULL;
1366 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1367 		v->mode = TOG_VIEW_SPLIT_NONE;
1368 
1369 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1371 		v->child->begin_y = v->child->resized_y;
1372 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1373 		v->child->begin_x = v->child->resized_x;
1374 
1375 
1376 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1377 		v->ncols = COLS;
1378 		v->child->ncols = COLS;
1379 		v->child->nscrolled = LINES - v->child->nlines;
1380 
1381 		err = view_init_hsplit(v, v->child->begin_y);
1382 		if (err)
1383 			return err;
1384 	}
1385 	v->child->mode = v->mode;
1386 	v->child->nlines = v->lines - v->child->begin_y;
1387 	v->focus_child = 1;
1388 
1389 	err = view_fullscreen(v);
1390 	if (err)
1391 		return err;
1392 	err = view_splitscreen(v->child);
1393 	if (err)
1394 		return err;
1395 
1396 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1397 		v->mode = TOG_VIEW_SPLIT_VERT;
1398 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1399 		err = offset_selection_down(v);
1400 		if (err)
1401 			return err;
1402 		err = offset_selection_down(v->child);
1403 		if (err)
1404 			return err;
1405 	} else {
1406 		offset_selection_up(v);
1407 		offset_selection_up(v->child);
1408 	}
1409 	if (v->resize)
1410 		err = v->resize(v, 0);
1411 	else if (v->child->resize)
1412 		err = v->child->resize(v->child, 0);
1413 
1414 	return err;
1415 }
1416 
1417 /*
1418  * Compute view->count from numeric input. Assign total to view->count and
1419  * return first non-numeric key entered.
1420  */
1421 static int
1422 get_compound_key(struct tog_view *view, int c)
1423 {
1424 	struct tog_view	*v = view;
1425 	int		 x, n = 0;
1426 
1427 	if (view_is_hsplit_top(view))
1428 		v = view->child;
1429 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1430 		v = view->parent;
1431 
1432 	view->count = 0;
1433 	cbreak();  /* block for input */
1434 	nodelay(view->window, FALSE);
1435 	wmove(v->window, v->nlines - 1, 0);
1436 	wclrtoeol(v->window);
1437 	waddch(v->window, ':');
1438 
1439 	do {
1440 		x = getcurx(v->window);
1441 		if (x != ERR && x < view->ncols) {
1442 			waddch(v->window, c);
1443 			wrefresh(v->window);
1444 		}
1445 
1446 		/*
1447 		 * Don't overflow. Max valid request should be the greatest
1448 		 * between the longest and total lines; cap at 10 million.
1449 		 */
1450 		if (n >= 9999999)
1451 			n = 9999999;
1452 		else
1453 			n = n * 10 + (c - '0');
1454 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1455 
1456 	if (c == 'G' || c == 'g') {	/* nG key map */
1457 		view->gline = view->hiline = n;
1458 		n = 0;
1459 		c = 0;
1460 	}
1461 
1462 	/* Massage excessive or inapplicable values at the input handler. */
1463 	view->count = n;
1464 
1465 	return c;
1466 }
1467 
1468 static void
1469 action_report(struct tog_view *view)
1470 {
1471 	struct tog_view *v = view;
1472 
1473 	if (view_is_hsplit_top(view))
1474 		v = view->child;
1475 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1476 		v = view->parent;
1477 
1478 	wmove(v->window, v->nlines - 1, 0);
1479 	wclrtoeol(v->window);
1480 	wprintw(v->window, ":%s", view->action);
1481 	wrefresh(v->window);
1482 
1483 	/*
1484 	 * Clear action status report. Only clear in blame view
1485 	 * once annotating is complete, otherwise it's too fast.
1486 	 */
1487 	if (view->type == TOG_VIEW_BLAME) {
1488 		if (view->state.blame.blame_complete)
1489 			view->action = NULL;
1490 	} else
1491 		view->action = NULL;
1492 }
1493 
1494 static const struct got_error *
1495 view_input(struct tog_view **new, int *done, struct tog_view *view,
1496     struct tog_view_list_head *views)
1497 {
1498 	const struct got_error *err = NULL;
1499 	struct tog_view *v;
1500 	int ch, errcode;
1501 
1502 	*new = NULL;
1503 
1504 	if (view->action)
1505 		action_report(view);
1506 
1507 	/* Clear "no matches" indicator. */
1508 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1509 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1510 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1511 		view->count = 0;
1512 	}
1513 
1514 	if (view->searching && !view->search_next_done) {
1515 		errcode = pthread_mutex_unlock(&tog_mutex);
1516 		if (errcode)
1517 			return got_error_set_errno(errcode,
1518 			    "pthread_mutex_unlock");
1519 		sched_yield();
1520 		errcode = pthread_mutex_lock(&tog_mutex);
1521 		if (errcode)
1522 			return got_error_set_errno(errcode,
1523 			    "pthread_mutex_lock");
1524 		view->search_next(view);
1525 		return NULL;
1526 	}
1527 
1528 	/* Allow threads to make progress while we are waiting for input. */
1529 	errcode = pthread_mutex_unlock(&tog_mutex);
1530 	if (errcode)
1531 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1532 	/* If we have an unfinished count, let C-g or backspace abort. */
1533 	if (view->count && --view->count) {
1534 		cbreak();
1535 		nodelay(view->window, TRUE);
1536 		ch = wgetch(view->window);
1537 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1538 			view->count = 0;
1539 		else
1540 			ch = view->ch;
1541 	} else {
1542 		ch = wgetch(view->window);
1543 		if (ch >= '1' && ch  <= '9')
1544 			view->ch = ch = get_compound_key(view, ch);
1545 	}
1546 	if (view->hiline && ch != ERR && ch != 0)
1547 		view->hiline = 0;  /* key pressed, clear line highlight */
1548 	nodelay(view->window, TRUE);
1549 	errcode = pthread_mutex_lock(&tog_mutex);
1550 	if (errcode)
1551 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1552 
1553 	if (tog_sigwinch_received || tog_sigcont_received) {
1554 		tog_resizeterm();
1555 		tog_sigwinch_received = 0;
1556 		tog_sigcont_received = 0;
1557 		TAILQ_FOREACH(v, views, entry) {
1558 			err = view_resize(v);
1559 			if (err)
1560 				return err;
1561 			err = v->input(new, v, KEY_RESIZE);
1562 			if (err)
1563 				return err;
1564 			if (v->child) {
1565 				err = view_resize(v->child);
1566 				if (err)
1567 					return err;
1568 				err = v->child->input(new, v->child,
1569 				    KEY_RESIZE);
1570 				if (err)
1571 					return err;
1572 				if (v->child->resized_x || v->child->resized_y) {
1573 					err = view_resize_split(v, 0);
1574 					if (err)
1575 						return err;
1576 				}
1577 			}
1578 		}
1579 	}
1580 
1581 	switch (ch) {
1582 	case '?':
1583 	case 'H':
1584 	case KEY_F(1):
1585 		if (view->type == TOG_VIEW_HELP)
1586 			err = view->reset(view);
1587 		else
1588 			err = view_request_new(new, view, TOG_VIEW_HELP);
1589 		break;
1590 	case '\t':
1591 		view->count = 0;
1592 		if (view->child) {
1593 			view->focussed = 0;
1594 			view->child->focussed = 1;
1595 			view->focus_child = 1;
1596 		} else if (view->parent) {
1597 			view->focussed = 0;
1598 			view->parent->focussed = 1;
1599 			view->parent->focus_child = 0;
1600 			if (!view_is_splitscreen(view)) {
1601 				if (view->parent->resize) {
1602 					err = view->parent->resize(view->parent,
1603 					    0);
1604 					if (err)
1605 						return err;
1606 				}
1607 				offset_selection_up(view->parent);
1608 				err = view_fullscreen(view->parent);
1609 				if (err)
1610 					return err;
1611 			}
1612 		}
1613 		break;
1614 	case 'q':
1615 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1616 			if (view->parent->resize) {
1617 				/* might need more commits to fill fullscreen */
1618 				err = view->parent->resize(view->parent, 0);
1619 				if (err)
1620 					break;
1621 			}
1622 			offset_selection_up(view->parent);
1623 		}
1624 		err = view->input(new, view, ch);
1625 		view->dying = 1;
1626 		break;
1627 	case 'Q':
1628 		*done = 1;
1629 		break;
1630 	case 'F':
1631 		view->count = 0;
1632 		if (view_is_parent_view(view)) {
1633 			if (view->child == NULL)
1634 				break;
1635 			if (view_is_splitscreen(view->child)) {
1636 				view->focussed = 0;
1637 				view->child->focussed = 1;
1638 				err = view_fullscreen(view->child);
1639 			} else {
1640 				err = view_splitscreen(view->child);
1641 				if (!err)
1642 					err = view_resize_split(view, 0);
1643 			}
1644 			if (err)
1645 				break;
1646 			err = view->child->input(new, view->child,
1647 			    KEY_RESIZE);
1648 		} else {
1649 			if (view_is_splitscreen(view)) {
1650 				view->parent->focussed = 0;
1651 				view->focussed = 1;
1652 				err = view_fullscreen(view);
1653 			} else {
1654 				err = view_splitscreen(view);
1655 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1656 					err = view_resize(view->parent);
1657 				if (!err)
1658 					err = view_resize_split(view, 0);
1659 			}
1660 			if (err)
1661 				break;
1662 			err = view->input(new, view, KEY_RESIZE);
1663 		}
1664 		if (err)
1665 			break;
1666 		if (view->resize) {
1667 			err = view->resize(view, 0);
1668 			if (err)
1669 				break;
1670 		}
1671 		if (view->parent)
1672 			err = offset_selection_down(view->parent);
1673 		if (!err)
1674 			err = offset_selection_down(view);
1675 		break;
1676 	case 'S':
1677 		view->count = 0;
1678 		err = switch_split(view);
1679 		break;
1680 	case '-':
1681 		err = view_resize_split(view, -1);
1682 		break;
1683 	case '+':
1684 		err = view_resize_split(view, 1);
1685 		break;
1686 	case KEY_RESIZE:
1687 		break;
1688 	case '/':
1689 		view->count = 0;
1690 		if (view->search_start)
1691 			view_search_start(view);
1692 		else
1693 			err = view->input(new, view, ch);
1694 		break;
1695 	case 'N':
1696 	case 'n':
1697 		if (view->search_started && view->search_next) {
1698 			view->searching = (ch == 'n' ?
1699 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1700 			view->search_next_done = 0;
1701 			view->search_next(view);
1702 		} else
1703 			err = view->input(new, view, ch);
1704 		break;
1705 	case 'A':
1706 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1707 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1708 			view->action = "Patience diff algorithm";
1709 		} else {
1710 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1711 			view->action = "Myers diff algorithm";
1712 		}
1713 		TAILQ_FOREACH(v, views, entry) {
1714 			if (v->reset) {
1715 				err = v->reset(v);
1716 				if (err)
1717 					return err;
1718 			}
1719 			if (v->child && v->child->reset) {
1720 				err = v->child->reset(v->child);
1721 				if (err)
1722 					return err;
1723 			}
1724 		}
1725 		break;
1726 	default:
1727 		err = view->input(new, view, ch);
1728 		break;
1729 	}
1730 
1731 	return err;
1732 }
1733 
1734 static int
1735 view_needs_focus_indication(struct tog_view *view)
1736 {
1737 	if (view_is_parent_view(view)) {
1738 		if (view->child == NULL || view->child->focussed)
1739 			return 0;
1740 		if (!view_is_splitscreen(view->child))
1741 			return 0;
1742 	} else if (!view_is_splitscreen(view))
1743 		return 0;
1744 
1745 	return view->focussed;
1746 }
1747 
1748 static const struct got_error *
1749 view_loop(struct tog_view *view)
1750 {
1751 	const struct got_error *err = NULL;
1752 	struct tog_view_list_head views;
1753 	struct tog_view *new_view;
1754 	char *mode;
1755 	int fast_refresh = 10;
1756 	int done = 0, errcode;
1757 
1758 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1759 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1760 		view->mode = TOG_VIEW_SPLIT_VERT;
1761 	else
1762 		view->mode = TOG_VIEW_SPLIT_HRZN;
1763 
1764 	errcode = pthread_mutex_lock(&tog_mutex);
1765 	if (errcode)
1766 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1767 
1768 	TAILQ_INIT(&views);
1769 	TAILQ_INSERT_HEAD(&views, view, entry);
1770 
1771 	view->focussed = 1;
1772 	err = view->show(view);
1773 	if (err)
1774 		return err;
1775 	update_panels();
1776 	doupdate();
1777 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1778 	    !tog_fatal_signal_received()) {
1779 		/* Refresh fast during initialization, then become slower. */
1780 		if (fast_refresh && --fast_refresh == 0)
1781 			halfdelay(10); /* switch to once per second */
1782 
1783 		err = view_input(&new_view, &done, view, &views);
1784 		if (err)
1785 			break;
1786 
1787 		if (view->dying && view == TAILQ_FIRST(&views) &&
1788 		    TAILQ_NEXT(view, entry) == NULL)
1789 			done = 1;
1790 		if (done) {
1791 			struct tog_view *v;
1792 
1793 			/*
1794 			 * When we quit, scroll the screen up a single line
1795 			 * so we don't lose any information.
1796 			 */
1797 			TAILQ_FOREACH(v, &views, entry) {
1798 				wmove(v->window, 0, 0);
1799 				wdeleteln(v->window);
1800 				wnoutrefresh(v->window);
1801 				if (v->child && !view_is_fullscreen(v)) {
1802 					wmove(v->child->window, 0, 0);
1803 					wdeleteln(v->child->window);
1804 					wnoutrefresh(v->child->window);
1805 				}
1806 			}
1807 			doupdate();
1808 		}
1809 
1810 		if (view->dying) {
1811 			struct tog_view *v, *prev = NULL;
1812 
1813 			if (view_is_parent_view(view))
1814 				prev = TAILQ_PREV(view, tog_view_list_head,
1815 				    entry);
1816 			else if (view->parent)
1817 				prev = view->parent;
1818 
1819 			if (view->parent) {
1820 				view->parent->child = NULL;
1821 				view->parent->focus_child = 0;
1822 				/* Restore fullscreen line height. */
1823 				view->parent->nlines = view->parent->lines;
1824 				err = view_resize(view->parent);
1825 				if (err)
1826 					break;
1827 				/* Make resized splits persist. */
1828 				view_transfer_size(view->parent, view);
1829 			} else
1830 				TAILQ_REMOVE(&views, view, entry);
1831 
1832 			err = view_close(view);
1833 			if (err)
1834 				goto done;
1835 
1836 			view = NULL;
1837 			TAILQ_FOREACH(v, &views, entry) {
1838 				if (v->focussed)
1839 					break;
1840 			}
1841 			if (view == NULL && new_view == NULL) {
1842 				/* No view has focus. Try to pick one. */
1843 				if (prev)
1844 					view = prev;
1845 				else if (!TAILQ_EMPTY(&views)) {
1846 					view = TAILQ_LAST(&views,
1847 					    tog_view_list_head);
1848 				}
1849 				if (view) {
1850 					if (view->focus_child) {
1851 						view->child->focussed = 1;
1852 						view = view->child;
1853 					} else
1854 						view->focussed = 1;
1855 				}
1856 			}
1857 		}
1858 		if (new_view) {
1859 			struct tog_view *v, *t;
1860 			/* Only allow one parent view per type. */
1861 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1862 				if (v->type != new_view->type)
1863 					continue;
1864 				TAILQ_REMOVE(&views, v, entry);
1865 				err = view_close(v);
1866 				if (err)
1867 					goto done;
1868 				break;
1869 			}
1870 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1871 			view = new_view;
1872 		}
1873 		if (view && !done) {
1874 			if (view_is_parent_view(view)) {
1875 				if (view->child && view->child->focussed)
1876 					view = view->child;
1877 			} else {
1878 				if (view->parent && view->parent->focussed)
1879 					view = view->parent;
1880 			}
1881 			show_panel(view->panel);
1882 			if (view->child && view_is_splitscreen(view->child))
1883 				show_panel(view->child->panel);
1884 			if (view->parent && view_is_splitscreen(view)) {
1885 				err = view->parent->show(view->parent);
1886 				if (err)
1887 					goto done;
1888 			}
1889 			err = view->show(view);
1890 			if (err)
1891 				goto done;
1892 			if (view->child) {
1893 				err = view->child->show(view->child);
1894 				if (err)
1895 					goto done;
1896 			}
1897 			update_panels();
1898 			doupdate();
1899 		}
1900 	}
1901 done:
1902 	while (!TAILQ_EMPTY(&views)) {
1903 		const struct got_error *close_err;
1904 		view = TAILQ_FIRST(&views);
1905 		TAILQ_REMOVE(&views, view, entry);
1906 		close_err = view_close(view);
1907 		if (close_err && err == NULL)
1908 			err = close_err;
1909 	}
1910 
1911 	errcode = pthread_mutex_unlock(&tog_mutex);
1912 	if (errcode && err == NULL)
1913 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1914 
1915 	return err;
1916 }
1917 
1918 __dead static void
1919 usage_log(void)
1920 {
1921 	endwin();
1922 	fprintf(stderr,
1923 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1924 	    getprogname());
1925 	exit(1);
1926 }
1927 
1928 /* Create newly allocated wide-character string equivalent to a byte string. */
1929 static const struct got_error *
1930 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1931 {
1932 	char *vis = NULL;
1933 	const struct got_error *err = NULL;
1934 
1935 	*ws = NULL;
1936 	*wlen = mbstowcs(NULL, s, 0);
1937 	if (*wlen == (size_t)-1) {
1938 		int vislen;
1939 		if (errno != EILSEQ)
1940 			return got_error_from_errno("mbstowcs");
1941 
1942 		/* byte string invalid in current encoding; try to "fix" it */
1943 		err = got_mbsavis(&vis, &vislen, s);
1944 		if (err)
1945 			return err;
1946 		*wlen = mbstowcs(NULL, vis, 0);
1947 		if (*wlen == (size_t)-1) {
1948 			err = got_error_from_errno("mbstowcs"); /* give up */
1949 			goto done;
1950 		}
1951 	}
1952 
1953 	*ws = calloc(*wlen + 1, sizeof(**ws));
1954 	if (*ws == NULL) {
1955 		err = got_error_from_errno("calloc");
1956 		goto done;
1957 	}
1958 
1959 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1960 		err = got_error_from_errno("mbstowcs");
1961 done:
1962 	free(vis);
1963 	if (err) {
1964 		free(*ws);
1965 		*ws = NULL;
1966 		*wlen = 0;
1967 	}
1968 	return err;
1969 }
1970 
1971 static const struct got_error *
1972 expand_tab(char **ptr, const char *src)
1973 {
1974 	char	*dst;
1975 	size_t	 len, n, idx = 0, sz = 0;
1976 
1977 	*ptr = NULL;
1978 	n = len = strlen(src);
1979 	dst = malloc(n + 1);
1980 	if (dst == NULL)
1981 		return got_error_from_errno("malloc");
1982 
1983 	while (idx < len && src[idx]) {
1984 		const char c = src[idx];
1985 
1986 		if (c == '\t') {
1987 			size_t nb = TABSIZE - sz % TABSIZE;
1988 			char *p;
1989 
1990 			p = realloc(dst, n + nb);
1991 			if (p == NULL) {
1992 				free(dst);
1993 				return got_error_from_errno("realloc");
1994 
1995 			}
1996 			dst = p;
1997 			n += nb;
1998 			memset(dst + sz, ' ', nb);
1999 			sz += nb;
2000 		} else
2001 			dst[sz++] = src[idx];
2002 		++idx;
2003 	}
2004 
2005 	dst[sz] = '\0';
2006 	*ptr = dst;
2007 	return NULL;
2008 }
2009 
2010 /*
2011  * Advance at most n columns from wline starting at offset off.
2012  * Return the index to the first character after the span operation.
2013  * Return the combined column width of all spanned wide character in
2014  * *rcol.
2015  */
2016 static int
2017 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2018 {
2019 	int width, i, cols = 0;
2020 
2021 	if (n == 0) {
2022 		*rcol = cols;
2023 		return off;
2024 	}
2025 
2026 	for (i = off; wline[i] != L'\0'; ++i) {
2027 		if (wline[i] == L'\t')
2028 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2029 		else
2030 			width = wcwidth(wline[i]);
2031 
2032 		if (width == -1) {
2033 			width = 1;
2034 			wline[i] = L'.';
2035 		}
2036 
2037 		if (cols + width > n)
2038 			break;
2039 		cols += width;
2040 	}
2041 
2042 	*rcol = cols;
2043 	return i;
2044 }
2045 
2046 /*
2047  * Format a line for display, ensuring that it won't overflow a width limit.
2048  * With scrolling, the width returned refers to the scrolled version of the
2049  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2050  */
2051 static const struct got_error *
2052 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2053     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2054 {
2055 	const struct got_error *err = NULL;
2056 	int cols;
2057 	wchar_t *wline = NULL;
2058 	char *exstr = NULL;
2059 	size_t wlen;
2060 	int i, scrollx;
2061 
2062 	*wlinep = NULL;
2063 	*widthp = 0;
2064 
2065 	if (expand) {
2066 		err = expand_tab(&exstr, line);
2067 		if (err)
2068 			return err;
2069 	}
2070 
2071 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2072 	free(exstr);
2073 	if (err)
2074 		return err;
2075 
2076 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2077 
2078 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2079 		wline[wlen - 1] = L'\0';
2080 		wlen--;
2081 	}
2082 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2083 		wline[wlen - 1] = L'\0';
2084 		wlen--;
2085 	}
2086 
2087 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2088 	wline[i] = L'\0';
2089 
2090 	if (widthp)
2091 		*widthp = cols;
2092 	if (scrollxp)
2093 		*scrollxp = scrollx;
2094 	if (err)
2095 		free(wline);
2096 	else
2097 		*wlinep = wline;
2098 	return err;
2099 }
2100 
2101 static const struct got_error*
2102 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2103     struct got_object_id *id, struct got_repository *repo)
2104 {
2105 	static const struct got_error *err = NULL;
2106 	struct got_reflist_entry *re;
2107 	char *s;
2108 	const char *name;
2109 
2110 	*refs_str = NULL;
2111 
2112 	TAILQ_FOREACH(re, refs, entry) {
2113 		struct got_tag_object *tag = NULL;
2114 		struct got_object_id *ref_id;
2115 		int cmp;
2116 
2117 		name = got_ref_get_name(re->ref);
2118 		if (strcmp(name, GOT_REF_HEAD) == 0)
2119 			continue;
2120 		if (strncmp(name, "refs/", 5) == 0)
2121 			name += 5;
2122 		if (strncmp(name, "got/", 4) == 0 &&
2123 		    strncmp(name, "got/backup/", 11) != 0)
2124 			continue;
2125 		if (strncmp(name, "heads/", 6) == 0)
2126 			name += 6;
2127 		if (strncmp(name, "remotes/", 8) == 0) {
2128 			name += 8;
2129 			s = strstr(name, "/" GOT_REF_HEAD);
2130 			if (s != NULL && s[strlen(s)] == '\0')
2131 				continue;
2132 		}
2133 		err = got_ref_resolve(&ref_id, repo, re->ref);
2134 		if (err)
2135 			break;
2136 		if (strncmp(name, "tags/", 5) == 0) {
2137 			err = got_object_open_as_tag(&tag, repo, ref_id);
2138 			if (err) {
2139 				if (err->code != GOT_ERR_OBJ_TYPE) {
2140 					free(ref_id);
2141 					break;
2142 				}
2143 				/* Ref points at something other than a tag. */
2144 				err = NULL;
2145 				tag = NULL;
2146 			}
2147 		}
2148 		cmp = got_object_id_cmp(tag ?
2149 		    got_object_tag_get_object_id(tag) : ref_id, id);
2150 		free(ref_id);
2151 		if (tag)
2152 			got_object_tag_close(tag);
2153 		if (cmp != 0)
2154 			continue;
2155 		s = *refs_str;
2156 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2157 		    s ? ", " : "", name) == -1) {
2158 			err = got_error_from_errno("asprintf");
2159 			free(s);
2160 			*refs_str = NULL;
2161 			break;
2162 		}
2163 		free(s);
2164 	}
2165 
2166 	return err;
2167 }
2168 
2169 static const struct got_error *
2170 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2171     int col_tab_align)
2172 {
2173 	char *smallerthan;
2174 
2175 	smallerthan = strchr(author, '<');
2176 	if (smallerthan && smallerthan[1] != '\0')
2177 		author = smallerthan + 1;
2178 	author[strcspn(author, "@>")] = '\0';
2179 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2180 	    col_tab_align, 0);
2181 }
2182 
2183 static const struct got_error *
2184 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2185     struct got_object_id *id, const size_t date_display_cols,
2186     int author_display_cols)
2187 {
2188 	struct tog_log_view_state *s = &view->state.log;
2189 	const struct got_error *err = NULL;
2190 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2191 	char *logmsg0 = NULL, *logmsg = NULL;
2192 	char *author = NULL;
2193 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2194 	int author_width, logmsg_width;
2195 	char *newline, *line = NULL;
2196 	int col, limit, scrollx;
2197 	const int avail = view->ncols;
2198 	struct tm tm;
2199 	time_t committer_time;
2200 	struct tog_color *tc;
2201 
2202 	committer_time = got_object_commit_get_committer_time(commit);
2203 	if (gmtime_r(&committer_time, &tm) == NULL)
2204 		return got_error_from_errno("gmtime_r");
2205 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2206 		return got_error(GOT_ERR_NO_SPACE);
2207 
2208 	if (avail <= date_display_cols)
2209 		limit = MIN(sizeof(datebuf) - 1, avail);
2210 	else
2211 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2212 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2213 	if (tc)
2214 		wattr_on(view->window,
2215 		    COLOR_PAIR(tc->colorpair), NULL);
2216 	waddnstr(view->window, datebuf, limit);
2217 	if (tc)
2218 		wattr_off(view->window,
2219 		    COLOR_PAIR(tc->colorpair), NULL);
2220 	col = limit;
2221 	if (col > avail)
2222 		goto done;
2223 
2224 	if (avail >= 120) {
2225 		char *id_str;
2226 		err = got_object_id_str(&id_str, id);
2227 		if (err)
2228 			goto done;
2229 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2230 		if (tc)
2231 			wattr_on(view->window,
2232 			    COLOR_PAIR(tc->colorpair), NULL);
2233 		wprintw(view->window, "%.8s ", id_str);
2234 		if (tc)
2235 			wattr_off(view->window,
2236 			    COLOR_PAIR(tc->colorpair), NULL);
2237 		free(id_str);
2238 		col += 9;
2239 		if (col > avail)
2240 			goto done;
2241 	}
2242 
2243 	if (s->use_committer)
2244 		author = strdup(got_object_commit_get_committer(commit));
2245 	else
2246 		author = strdup(got_object_commit_get_author(commit));
2247 	if (author == NULL) {
2248 		err = got_error_from_errno("strdup");
2249 		goto done;
2250 	}
2251 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2252 	if (err)
2253 		goto done;
2254 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2255 	if (tc)
2256 		wattr_on(view->window,
2257 		    COLOR_PAIR(tc->colorpair), NULL);
2258 	waddwstr(view->window, wauthor);
2259 	col += author_width;
2260 	while (col < avail && author_width < author_display_cols + 2) {
2261 		waddch(view->window, ' ');
2262 		col++;
2263 		author_width++;
2264 	}
2265 	if (tc)
2266 		wattr_off(view->window,
2267 		    COLOR_PAIR(tc->colorpair), NULL);
2268 	if (col > avail)
2269 		goto done;
2270 
2271 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2272 	if (err)
2273 		goto done;
2274 	logmsg = logmsg0;
2275 	while (*logmsg == '\n')
2276 		logmsg++;
2277 	newline = strchr(logmsg, '\n');
2278 	if (newline)
2279 		*newline = '\0';
2280 	limit = avail - col;
2281 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2282 		limit--;	/* for the border */
2283 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2284 	    limit, col, 1);
2285 	if (err)
2286 		goto done;
2287 	waddwstr(view->window, &wlogmsg[scrollx]);
2288 	col += MAX(logmsg_width, 0);
2289 	while (col < avail) {
2290 		waddch(view->window, ' ');
2291 		col++;
2292 	}
2293 done:
2294 	free(logmsg0);
2295 	free(wlogmsg);
2296 	free(author);
2297 	free(wauthor);
2298 	free(line);
2299 	return err;
2300 }
2301 
2302 static struct commit_queue_entry *
2303 alloc_commit_queue_entry(struct got_commit_object *commit,
2304     struct got_object_id *id)
2305 {
2306 	struct commit_queue_entry *entry;
2307 	struct got_object_id *dup;
2308 
2309 	entry = calloc(1, sizeof(*entry));
2310 	if (entry == NULL)
2311 		return NULL;
2312 
2313 	dup = got_object_id_dup(id);
2314 	if (dup == NULL) {
2315 		free(entry);
2316 		return NULL;
2317 	}
2318 
2319 	entry->id = dup;
2320 	entry->commit = commit;
2321 	return entry;
2322 }
2323 
2324 static void
2325 pop_commit(struct commit_queue *commits)
2326 {
2327 	struct commit_queue_entry *entry;
2328 
2329 	entry = TAILQ_FIRST(&commits->head);
2330 	TAILQ_REMOVE(&commits->head, entry, entry);
2331 	got_object_commit_close(entry->commit);
2332 	commits->ncommits--;
2333 	free(entry->id);
2334 	free(entry);
2335 }
2336 
2337 static void
2338 free_commits(struct commit_queue *commits)
2339 {
2340 	while (!TAILQ_EMPTY(&commits->head))
2341 		pop_commit(commits);
2342 }
2343 
2344 static const struct got_error *
2345 match_commit(int *have_match, struct got_object_id *id,
2346     struct got_commit_object *commit, regex_t *regex)
2347 {
2348 	const struct got_error *err = NULL;
2349 	regmatch_t regmatch;
2350 	char *id_str = NULL, *logmsg = NULL;
2351 
2352 	*have_match = 0;
2353 
2354 	err = got_object_id_str(&id_str, id);
2355 	if (err)
2356 		return err;
2357 
2358 	err = got_object_commit_get_logmsg(&logmsg, commit);
2359 	if (err)
2360 		goto done;
2361 
2362 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2363 	    &regmatch, 0) == 0 ||
2364 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2365 	    &regmatch, 0) == 0 ||
2366 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2367 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2368 		*have_match = 1;
2369 done:
2370 	free(id_str);
2371 	free(logmsg);
2372 	return err;
2373 }
2374 
2375 static const struct got_error *
2376 queue_commits(struct tog_log_thread_args *a)
2377 {
2378 	const struct got_error *err = NULL;
2379 
2380 	/*
2381 	 * We keep all commits open throughout the lifetime of the log
2382 	 * view in order to avoid having to re-fetch commits from disk
2383 	 * while updating the display.
2384 	 */
2385 	do {
2386 		struct got_object_id id;
2387 		struct got_commit_object *commit;
2388 		struct commit_queue_entry *entry;
2389 		int limit_match = 0;
2390 		int errcode;
2391 
2392 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2393 		    NULL, NULL);
2394 		if (err)
2395 			break;
2396 
2397 		err = got_object_open_as_commit(&commit, a->repo, &id);
2398 		if (err)
2399 			break;
2400 		entry = alloc_commit_queue_entry(commit, &id);
2401 		if (entry == NULL) {
2402 			err = got_error_from_errno("alloc_commit_queue_entry");
2403 			break;
2404 		}
2405 
2406 		errcode = pthread_mutex_lock(&tog_mutex);
2407 		if (errcode) {
2408 			err = got_error_set_errno(errcode,
2409 			    "pthread_mutex_lock");
2410 			break;
2411 		}
2412 
2413 		entry->idx = a->real_commits->ncommits;
2414 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2415 		a->real_commits->ncommits++;
2416 
2417 		if (*a->limiting) {
2418 			err = match_commit(&limit_match, &id, commit,
2419 			    a->limit_regex);
2420 			if (err)
2421 				break;
2422 
2423 			if (limit_match) {
2424 				struct commit_queue_entry *matched;
2425 
2426 				matched = alloc_commit_queue_entry(
2427 				    entry->commit, entry->id);
2428 				if (matched == NULL) {
2429 					err = got_error_from_errno(
2430 					    "alloc_commit_queue_entry");
2431 					break;
2432 				}
2433 				matched->commit = entry->commit;
2434 				got_object_commit_retain(entry->commit);
2435 
2436 				matched->idx = a->limit_commits->ncommits;
2437 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2438 				    matched, entry);
2439 				a->limit_commits->ncommits++;
2440 			}
2441 
2442 			/*
2443 			 * This is how we signal log_thread() that we
2444 			 * have found a match, and that it should be
2445 			 * counted as a new entry for the view.
2446 			 */
2447 			a->limit_match = limit_match;
2448 		}
2449 
2450 		if (*a->searching == TOG_SEARCH_FORWARD &&
2451 		    !*a->search_next_done) {
2452 			int have_match;
2453 			err = match_commit(&have_match, &id, commit, a->regex);
2454 			if (err)
2455 				break;
2456 
2457 			if (*a->limiting) {
2458 				if (limit_match && have_match)
2459 					*a->search_next_done =
2460 					    TOG_SEARCH_HAVE_MORE;
2461 			} else if (have_match)
2462 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2463 		}
2464 
2465 		errcode = pthread_mutex_unlock(&tog_mutex);
2466 		if (errcode && err == NULL)
2467 			err = got_error_set_errno(errcode,
2468 			    "pthread_mutex_unlock");
2469 		if (err)
2470 			break;
2471 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2472 
2473 	return err;
2474 }
2475 
2476 static void
2477 select_commit(struct tog_log_view_state *s)
2478 {
2479 	struct commit_queue_entry *entry;
2480 	int ncommits = 0;
2481 
2482 	entry = s->first_displayed_entry;
2483 	while (entry) {
2484 		if (ncommits == s->selected) {
2485 			s->selected_entry = entry;
2486 			break;
2487 		}
2488 		entry = TAILQ_NEXT(entry, entry);
2489 		ncommits++;
2490 	}
2491 }
2492 
2493 static const struct got_error *
2494 draw_commits(struct tog_view *view)
2495 {
2496 	const struct got_error *err = NULL;
2497 	struct tog_log_view_state *s = &view->state.log;
2498 	struct commit_queue_entry *entry = s->selected_entry;
2499 	int limit = view->nlines;
2500 	int width;
2501 	int ncommits, author_cols = 4;
2502 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2503 	char *refs_str = NULL;
2504 	wchar_t *wline;
2505 	struct tog_color *tc;
2506 	static const size_t date_display_cols = 12;
2507 
2508 	if (view_is_hsplit_top(view))
2509 		--limit;  /* account for border */
2510 
2511 	if (s->selected_entry &&
2512 	    !(view->searching && view->search_next_done == 0)) {
2513 		struct got_reflist_head *refs;
2514 		err = got_object_id_str(&id_str, s->selected_entry->id);
2515 		if (err)
2516 			return err;
2517 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2518 		    s->selected_entry->id);
2519 		if (refs) {
2520 			err = build_refs_str(&refs_str, refs,
2521 			    s->selected_entry->id, s->repo);
2522 			if (err)
2523 				goto done;
2524 		}
2525 	}
2526 
2527 	if (s->thread_args.commits_needed == 0)
2528 		halfdelay(10); /* disable fast refresh */
2529 
2530 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2531 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2532 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2533 		    (view->searching && !view->search_next_done) ?
2534 		    "searching..." : "loading...") == -1) {
2535 			err = got_error_from_errno("asprintf");
2536 			goto done;
2537 		}
2538 	} else {
2539 		const char *search_str = NULL;
2540 		const char *limit_str = NULL;
2541 
2542 		if (view->searching) {
2543 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2544 				search_str = "no more matches";
2545 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2546 				search_str = "no matches found";
2547 			else if (!view->search_next_done)
2548 				search_str = "searching...";
2549 		}
2550 
2551 		if (s->limit_view && s->commits->ncommits == 0)
2552 			limit_str = "no matches found";
2553 
2554 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2555 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2556 		    search_str ? search_str : (refs_str ? refs_str : ""),
2557 		    limit_str ? limit_str : "") == -1) {
2558 			err = got_error_from_errno("asprintf");
2559 			goto done;
2560 		}
2561 	}
2562 
2563 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2564 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2565 		    "........................................",
2566 		    s->in_repo_path, ncommits_str) == -1) {
2567 			err = got_error_from_errno("asprintf");
2568 			header = NULL;
2569 			goto done;
2570 		}
2571 	} else if (asprintf(&header, "commit %s%s",
2572 	    id_str ? id_str : "........................................",
2573 	    ncommits_str) == -1) {
2574 		err = got_error_from_errno("asprintf");
2575 		header = NULL;
2576 		goto done;
2577 	}
2578 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2579 	if (err)
2580 		goto done;
2581 
2582 	werase(view->window);
2583 
2584 	if (view_needs_focus_indication(view))
2585 		wstandout(view->window);
2586 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2587 	if (tc)
2588 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2589 	waddwstr(view->window, wline);
2590 	while (width < view->ncols) {
2591 		waddch(view->window, ' ');
2592 		width++;
2593 	}
2594 	if (tc)
2595 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2596 	if (view_needs_focus_indication(view))
2597 		wstandend(view->window);
2598 	free(wline);
2599 	if (limit <= 1)
2600 		goto done;
2601 
2602 	/* Grow author column size if necessary, and set view->maxx. */
2603 	entry = s->first_displayed_entry;
2604 	ncommits = 0;
2605 	view->maxx = 0;
2606 	while (entry) {
2607 		struct got_commit_object *c = entry->commit;
2608 		char *author, *eol, *msg, *msg0;
2609 		wchar_t *wauthor, *wmsg;
2610 		int width;
2611 		if (ncommits >= limit - 1)
2612 			break;
2613 		if (s->use_committer)
2614 			author = strdup(got_object_commit_get_committer(c));
2615 		else
2616 			author = strdup(got_object_commit_get_author(c));
2617 		if (author == NULL) {
2618 			err = got_error_from_errno("strdup");
2619 			goto done;
2620 		}
2621 		err = format_author(&wauthor, &width, author, COLS,
2622 		    date_display_cols);
2623 		if (author_cols < width)
2624 			author_cols = width;
2625 		free(wauthor);
2626 		free(author);
2627 		if (err)
2628 			goto done;
2629 		err = got_object_commit_get_logmsg(&msg0, c);
2630 		if (err)
2631 			goto done;
2632 		msg = msg0;
2633 		while (*msg == '\n')
2634 			++msg;
2635 		if ((eol = strchr(msg, '\n')))
2636 			*eol = '\0';
2637 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2638 		    date_display_cols + author_cols, 0);
2639 		if (err)
2640 			goto done;
2641 		view->maxx = MAX(view->maxx, width);
2642 		free(msg0);
2643 		free(wmsg);
2644 		ncommits++;
2645 		entry = TAILQ_NEXT(entry, entry);
2646 	}
2647 
2648 	entry = s->first_displayed_entry;
2649 	s->last_displayed_entry = s->first_displayed_entry;
2650 	ncommits = 0;
2651 	while (entry) {
2652 		if (ncommits >= limit - 1)
2653 			break;
2654 		if (ncommits == s->selected)
2655 			wstandout(view->window);
2656 		err = draw_commit(view, entry->commit, entry->id,
2657 		    date_display_cols, author_cols);
2658 		if (ncommits == s->selected)
2659 			wstandend(view->window);
2660 		if (err)
2661 			goto done;
2662 		ncommits++;
2663 		s->last_displayed_entry = entry;
2664 		entry = TAILQ_NEXT(entry, entry);
2665 	}
2666 
2667 	view_border(view);
2668 done:
2669 	free(id_str);
2670 	free(refs_str);
2671 	free(ncommits_str);
2672 	free(header);
2673 	return err;
2674 }
2675 
2676 static void
2677 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2678 {
2679 	struct commit_queue_entry *entry;
2680 	int nscrolled = 0;
2681 
2682 	entry = TAILQ_FIRST(&s->commits->head);
2683 	if (s->first_displayed_entry == entry)
2684 		return;
2685 
2686 	entry = s->first_displayed_entry;
2687 	while (entry && nscrolled < maxscroll) {
2688 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2689 		if (entry) {
2690 			s->first_displayed_entry = entry;
2691 			nscrolled++;
2692 		}
2693 	}
2694 }
2695 
2696 static const struct got_error *
2697 trigger_log_thread(struct tog_view *view, int wait)
2698 {
2699 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2700 	int errcode;
2701 
2702 	halfdelay(1); /* fast refresh while loading commits */
2703 
2704 	while (!ta->log_complete && !tog_thread_error &&
2705 	    (ta->commits_needed > 0 || ta->load_all)) {
2706 		/* Wake the log thread. */
2707 		errcode = pthread_cond_signal(&ta->need_commits);
2708 		if (errcode)
2709 			return got_error_set_errno(errcode,
2710 			    "pthread_cond_signal");
2711 
2712 		/*
2713 		 * The mutex will be released while the view loop waits
2714 		 * in wgetch(), at which time the log thread will run.
2715 		 */
2716 		if (!wait)
2717 			break;
2718 
2719 		/* Display progress update in log view. */
2720 		show_log_view(view);
2721 		update_panels();
2722 		doupdate();
2723 
2724 		/* Wait right here while next commit is being loaded. */
2725 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2726 		if (errcode)
2727 			return got_error_set_errno(errcode,
2728 			    "pthread_cond_wait");
2729 
2730 		/* Display progress update in log view. */
2731 		show_log_view(view);
2732 		update_panels();
2733 		doupdate();
2734 	}
2735 
2736 	return NULL;
2737 }
2738 
2739 static const struct got_error *
2740 request_log_commits(struct tog_view *view)
2741 {
2742 	struct tog_log_view_state	*state = &view->state.log;
2743 	const struct got_error		*err = NULL;
2744 
2745 	if (state->thread_args.log_complete)
2746 		return NULL;
2747 
2748 	state->thread_args.commits_needed += view->nscrolled;
2749 	err = trigger_log_thread(view, 1);
2750 	view->nscrolled = 0;
2751 
2752 	return err;
2753 }
2754 
2755 static const struct got_error *
2756 log_scroll_down(struct tog_view *view, int maxscroll)
2757 {
2758 	struct tog_log_view_state *s = &view->state.log;
2759 	const struct got_error *err = NULL;
2760 	struct commit_queue_entry *pentry;
2761 	int nscrolled = 0, ncommits_needed;
2762 
2763 	if (s->last_displayed_entry == NULL)
2764 		return NULL;
2765 
2766 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2767 	if (s->commits->ncommits < ncommits_needed &&
2768 	    !s->thread_args.log_complete) {
2769 		/*
2770 		 * Ask the log thread for required amount of commits.
2771 		 */
2772 		s->thread_args.commits_needed +=
2773 		    ncommits_needed - s->commits->ncommits;
2774 		err = trigger_log_thread(view, 1);
2775 		if (err)
2776 			return err;
2777 	}
2778 
2779 	do {
2780 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2781 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2782 			break;
2783 
2784 		s->last_displayed_entry = pentry ?
2785 		    pentry : s->last_displayed_entry;
2786 
2787 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2788 		if (pentry == NULL)
2789 			break;
2790 		s->first_displayed_entry = pentry;
2791 	} while (++nscrolled < maxscroll);
2792 
2793 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2794 		view->nscrolled += nscrolled;
2795 	else
2796 		view->nscrolled = 0;
2797 
2798 	return err;
2799 }
2800 
2801 static const struct got_error *
2802 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2803     struct got_commit_object *commit, struct got_object_id *commit_id,
2804     struct tog_view *log_view, struct got_repository *repo)
2805 {
2806 	const struct got_error *err;
2807 	struct got_object_qid *parent_id;
2808 	struct tog_view *diff_view;
2809 
2810 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2811 	if (diff_view == NULL)
2812 		return got_error_from_errno("view_open");
2813 
2814 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2815 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2816 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2817 	if (err == NULL)
2818 		*new_view = diff_view;
2819 	return err;
2820 }
2821 
2822 static const struct got_error *
2823 tree_view_visit_subtree(struct tog_tree_view_state *s,
2824     struct got_tree_object *subtree)
2825 {
2826 	struct tog_parent_tree *parent;
2827 
2828 	parent = calloc(1, sizeof(*parent));
2829 	if (parent == NULL)
2830 		return got_error_from_errno("calloc");
2831 
2832 	parent->tree = s->tree;
2833 	parent->first_displayed_entry = s->first_displayed_entry;
2834 	parent->selected_entry = s->selected_entry;
2835 	parent->selected = s->selected;
2836 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2837 	s->tree = subtree;
2838 	s->selected = 0;
2839 	s->first_displayed_entry = NULL;
2840 	return NULL;
2841 }
2842 
2843 static const struct got_error *
2844 tree_view_walk_path(struct tog_tree_view_state *s,
2845     struct got_commit_object *commit, const char *path)
2846 {
2847 	const struct got_error *err = NULL;
2848 	struct got_tree_object *tree = NULL;
2849 	const char *p;
2850 	char *slash, *subpath = NULL;
2851 
2852 	/* Walk the path and open corresponding tree objects. */
2853 	p = path;
2854 	while (*p) {
2855 		struct got_tree_entry *te;
2856 		struct got_object_id *tree_id;
2857 		char *te_name;
2858 
2859 		while (p[0] == '/')
2860 			p++;
2861 
2862 		/* Ensure the correct subtree entry is selected. */
2863 		slash = strchr(p, '/');
2864 		if (slash == NULL)
2865 			te_name = strdup(p);
2866 		else
2867 			te_name = strndup(p, slash - p);
2868 		if (te_name == NULL) {
2869 			err = got_error_from_errno("strndup");
2870 			break;
2871 		}
2872 		te = got_object_tree_find_entry(s->tree, te_name);
2873 		if (te == NULL) {
2874 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2875 			free(te_name);
2876 			break;
2877 		}
2878 		free(te_name);
2879 		s->first_displayed_entry = s->selected_entry = te;
2880 
2881 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2882 			break; /* jump to this file's entry */
2883 
2884 		slash = strchr(p, '/');
2885 		if (slash)
2886 			subpath = strndup(path, slash - path);
2887 		else
2888 			subpath = strdup(path);
2889 		if (subpath == NULL) {
2890 			err = got_error_from_errno("strdup");
2891 			break;
2892 		}
2893 
2894 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2895 		    subpath);
2896 		if (err)
2897 			break;
2898 
2899 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2900 		free(tree_id);
2901 		if (err)
2902 			break;
2903 
2904 		err = tree_view_visit_subtree(s, tree);
2905 		if (err) {
2906 			got_object_tree_close(tree);
2907 			break;
2908 		}
2909 		if (slash == NULL)
2910 			break;
2911 		free(subpath);
2912 		subpath = NULL;
2913 		p = slash;
2914 	}
2915 
2916 	free(subpath);
2917 	return err;
2918 }
2919 
2920 static const struct got_error *
2921 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2922     struct commit_queue_entry *entry, const char *path,
2923     const char *head_ref_name, struct got_repository *repo)
2924 {
2925 	const struct got_error *err = NULL;
2926 	struct tog_tree_view_state *s;
2927 	struct tog_view *tree_view;
2928 
2929 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2930 	if (tree_view == NULL)
2931 		return got_error_from_errno("view_open");
2932 
2933 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2934 	if (err)
2935 		return err;
2936 	s = &tree_view->state.tree;
2937 
2938 	*new_view = tree_view;
2939 
2940 	if (got_path_is_root_dir(path))
2941 		return NULL;
2942 
2943 	return tree_view_walk_path(s, entry->commit, path);
2944 }
2945 
2946 static const struct got_error *
2947 block_signals_used_by_main_thread(void)
2948 {
2949 	sigset_t sigset;
2950 	int errcode;
2951 
2952 	if (sigemptyset(&sigset) == -1)
2953 		return got_error_from_errno("sigemptyset");
2954 
2955 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2956 	if (sigaddset(&sigset, SIGWINCH) == -1)
2957 		return got_error_from_errno("sigaddset");
2958 	if (sigaddset(&sigset, SIGCONT) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 	if (sigaddset(&sigset, SIGINT) == -1)
2961 		return got_error_from_errno("sigaddset");
2962 	if (sigaddset(&sigset, SIGTERM) == -1)
2963 		return got_error_from_errno("sigaddset");
2964 
2965 	/* ncurses handles SIGTSTP */
2966 	if (sigaddset(&sigset, SIGTSTP) == -1)
2967 		return got_error_from_errno("sigaddset");
2968 
2969 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2970 	if (errcode)
2971 		return got_error_set_errno(errcode, "pthread_sigmask");
2972 
2973 	return NULL;
2974 }
2975 
2976 static void *
2977 log_thread(void *arg)
2978 {
2979 	const struct got_error *err = NULL;
2980 	int errcode = 0;
2981 	struct tog_log_thread_args *a = arg;
2982 	int done = 0;
2983 
2984 	/*
2985 	 * Sync startup with main thread such that we begin our
2986 	 * work once view_input() has released the mutex.
2987 	 */
2988 	errcode = pthread_mutex_lock(&tog_mutex);
2989 	if (errcode) {
2990 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2991 		return (void *)err;
2992 	}
2993 
2994 	err = block_signals_used_by_main_thread();
2995 	if (err) {
2996 		pthread_mutex_unlock(&tog_mutex);
2997 		goto done;
2998 	}
2999 
3000 	while (!done && !err && !tog_fatal_signal_received()) {
3001 		errcode = pthread_mutex_unlock(&tog_mutex);
3002 		if (errcode) {
3003 			err = got_error_set_errno(errcode,
3004 			    "pthread_mutex_unlock");
3005 			goto done;
3006 		}
3007 		err = queue_commits(a);
3008 		if (err) {
3009 			if (err->code != GOT_ERR_ITER_COMPLETED)
3010 				goto done;
3011 			err = NULL;
3012 			done = 1;
3013 		} else if (a->commits_needed > 0 && !a->load_all) {
3014 			if (*a->limiting) {
3015 				if (a->limit_match)
3016 					a->commits_needed--;
3017 			} else
3018 				a->commits_needed--;
3019 		}
3020 
3021 		errcode = pthread_mutex_lock(&tog_mutex);
3022 		if (errcode) {
3023 			err = got_error_set_errno(errcode,
3024 			    "pthread_mutex_lock");
3025 			goto done;
3026 		} else if (*a->quit)
3027 			done = 1;
3028 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3029 			*a->first_displayed_entry =
3030 			    TAILQ_FIRST(&a->limit_commits->head);
3031 			*a->selected_entry = *a->first_displayed_entry;
3032 		} else if (*a->first_displayed_entry == NULL) {
3033 			*a->first_displayed_entry =
3034 			    TAILQ_FIRST(&a->real_commits->head);
3035 			*a->selected_entry = *a->first_displayed_entry;
3036 		}
3037 
3038 		errcode = pthread_cond_signal(&a->commit_loaded);
3039 		if (errcode) {
3040 			err = got_error_set_errno(errcode,
3041 			    "pthread_cond_signal");
3042 			pthread_mutex_unlock(&tog_mutex);
3043 			goto done;
3044 		}
3045 
3046 		if (done)
3047 			a->commits_needed = 0;
3048 		else {
3049 			if (a->commits_needed == 0 && !a->load_all) {
3050 				errcode = pthread_cond_wait(&a->need_commits,
3051 				    &tog_mutex);
3052 				if (errcode) {
3053 					err = got_error_set_errno(errcode,
3054 					    "pthread_cond_wait");
3055 					pthread_mutex_unlock(&tog_mutex);
3056 					goto done;
3057 				}
3058 				if (*a->quit)
3059 					done = 1;
3060 			}
3061 		}
3062 	}
3063 	a->log_complete = 1;
3064 	errcode = pthread_mutex_unlock(&tog_mutex);
3065 	if (errcode)
3066 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3067 done:
3068 	if (err) {
3069 		tog_thread_error = 1;
3070 		pthread_cond_signal(&a->commit_loaded);
3071 	}
3072 	return (void *)err;
3073 }
3074 
3075 static const struct got_error *
3076 stop_log_thread(struct tog_log_view_state *s)
3077 {
3078 	const struct got_error *err = NULL, *thread_err = NULL;
3079 	int errcode;
3080 
3081 	if (s->thread) {
3082 		s->quit = 1;
3083 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3084 		if (errcode)
3085 			return got_error_set_errno(errcode,
3086 			    "pthread_cond_signal");
3087 		errcode = pthread_mutex_unlock(&tog_mutex);
3088 		if (errcode)
3089 			return got_error_set_errno(errcode,
3090 			    "pthread_mutex_unlock");
3091 		errcode = pthread_join(s->thread, (void **)&thread_err);
3092 		if (errcode)
3093 			return got_error_set_errno(errcode, "pthread_join");
3094 		errcode = pthread_mutex_lock(&tog_mutex);
3095 		if (errcode)
3096 			return got_error_set_errno(errcode,
3097 			    "pthread_mutex_lock");
3098 		s->thread = 0; //NULL;
3099 	}
3100 
3101 	if (s->thread_args.repo) {
3102 		err = got_repo_close(s->thread_args.repo);
3103 		s->thread_args.repo = NULL;
3104 	}
3105 
3106 	if (s->thread_args.pack_fds) {
3107 		const struct got_error *pack_err =
3108 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3109 		if (err == NULL)
3110 			err = pack_err;
3111 		s->thread_args.pack_fds = NULL;
3112 	}
3113 
3114 	if (s->thread_args.graph) {
3115 		got_commit_graph_close(s->thread_args.graph);
3116 		s->thread_args.graph = NULL;
3117 	}
3118 
3119 	return err ? err : thread_err;
3120 }
3121 
3122 static const struct got_error *
3123 close_log_view(struct tog_view *view)
3124 {
3125 	const struct got_error *err = NULL;
3126 	struct tog_log_view_state *s = &view->state.log;
3127 	int errcode;
3128 
3129 	err = stop_log_thread(s);
3130 
3131 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3132 	if (errcode && err == NULL)
3133 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3134 
3135 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3136 	if (errcode && err == NULL)
3137 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3138 
3139 	free_commits(&s->limit_commits);
3140 	free_commits(&s->real_commits);
3141 	free(s->in_repo_path);
3142 	s->in_repo_path = NULL;
3143 	free(s->start_id);
3144 	s->start_id = NULL;
3145 	free(s->head_ref_name);
3146 	s->head_ref_name = NULL;
3147 	return err;
3148 }
3149 
3150 /*
3151  * We use two queues to implement the limit feature: first consists of
3152  * commits matching the current limit_regex; second is the real queue
3153  * of all known commits (real_commits). When the user starts limiting,
3154  * we swap queues such that all movement and displaying functionality
3155  * works with very slight change.
3156  */
3157 static const struct got_error *
3158 limit_log_view(struct tog_view *view)
3159 {
3160 	struct tog_log_view_state *s = &view->state.log;
3161 	struct commit_queue_entry *entry;
3162 	struct tog_view	*v = view;
3163 	const struct got_error *err = NULL;
3164 	char pattern[1024];
3165 	int ret;
3166 
3167 	if (view_is_hsplit_top(view))
3168 		v = view->child;
3169 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3170 		v = view->parent;
3171 
3172 	/* Get the pattern */
3173 	wmove(v->window, v->nlines - 1, 0);
3174 	wclrtoeol(v->window);
3175 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3176 	nodelay(v->window, FALSE);
3177 	nocbreak();
3178 	echo();
3179 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3180 	cbreak();
3181 	noecho();
3182 	nodelay(v->window, TRUE);
3183 	if (ret == ERR)
3184 		return NULL;
3185 
3186 	if (*pattern == '\0') {
3187 		/*
3188 		 * Safety measure for the situation where the user
3189 		 * resets limit without previously limiting anything.
3190 		 */
3191 		if (!s->limit_view)
3192 			return NULL;
3193 
3194 		/*
3195 		 * User could have pressed Ctrl+L, which refreshed the
3196 		 * commit queues, it means we can't save previously
3197 		 * (before limit took place) displayed entries,
3198 		 * because they would point to already free'ed memory,
3199 		 * so we are forced to always select first entry of
3200 		 * the queue.
3201 		 */
3202 		s->commits = &s->real_commits;
3203 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3204 		s->selected_entry = s->first_displayed_entry;
3205 		s->selected = 0;
3206 		s->limit_view = 0;
3207 
3208 		return NULL;
3209 	}
3210 
3211 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3212 		return NULL;
3213 
3214 	s->limit_view = 1;
3215 
3216 	/* Clear the screen while loading limit view */
3217 	s->first_displayed_entry = NULL;
3218 	s->last_displayed_entry = NULL;
3219 	s->selected_entry = NULL;
3220 	s->commits = &s->limit_commits;
3221 
3222 	/* Prepare limit queue for new search */
3223 	free_commits(&s->limit_commits);
3224 	s->limit_commits.ncommits = 0;
3225 
3226 	/* First process commits, which are in queue already */
3227 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3228 		int have_match = 0;
3229 
3230 		err = match_commit(&have_match, entry->id,
3231 		    entry->commit, &s->limit_regex);
3232 		if (err)
3233 			return err;
3234 
3235 		if (have_match) {
3236 			struct commit_queue_entry *matched;
3237 
3238 			matched = alloc_commit_queue_entry(entry->commit,
3239 			    entry->id);
3240 			if (matched == NULL) {
3241 				err = got_error_from_errno(
3242 				    "alloc_commit_queue_entry");
3243 				break;
3244 			}
3245 			matched->commit = entry->commit;
3246 			got_object_commit_retain(entry->commit);
3247 
3248 			matched->idx = s->limit_commits.ncommits;
3249 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3250 			    matched, entry);
3251 			s->limit_commits.ncommits++;
3252 		}
3253 	}
3254 
3255 	/* Second process all the commits, until we fill the screen */
3256 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3257 	    !s->thread_args.log_complete) {
3258 		s->thread_args.commits_needed +=
3259 		    view->nlines - s->limit_commits.ncommits - 1;
3260 		err = trigger_log_thread(view, 1);
3261 		if (err)
3262 			return err;
3263 	}
3264 
3265 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3266 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3267 	s->selected = 0;
3268 
3269 	return NULL;
3270 }
3271 
3272 static const struct got_error *
3273 search_start_log_view(struct tog_view *view)
3274 {
3275 	struct tog_log_view_state *s = &view->state.log;
3276 
3277 	s->matched_entry = NULL;
3278 	s->search_entry = NULL;
3279 	return NULL;
3280 }
3281 
3282 static const struct got_error *
3283 search_next_log_view(struct tog_view *view)
3284 {
3285 	const struct got_error *err = NULL;
3286 	struct tog_log_view_state *s = &view->state.log;
3287 	struct commit_queue_entry *entry;
3288 
3289 	/* Display progress update in log view. */
3290 	show_log_view(view);
3291 	update_panels();
3292 	doupdate();
3293 
3294 	if (s->search_entry) {
3295 		int errcode, ch;
3296 		errcode = pthread_mutex_unlock(&tog_mutex);
3297 		if (errcode)
3298 			return got_error_set_errno(errcode,
3299 			    "pthread_mutex_unlock");
3300 		ch = wgetch(view->window);
3301 		errcode = pthread_mutex_lock(&tog_mutex);
3302 		if (errcode)
3303 			return got_error_set_errno(errcode,
3304 			    "pthread_mutex_lock");
3305 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3306 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3307 			return NULL;
3308 		}
3309 		if (view->searching == TOG_SEARCH_FORWARD)
3310 			entry = TAILQ_NEXT(s->search_entry, entry);
3311 		else
3312 			entry = TAILQ_PREV(s->search_entry,
3313 			    commit_queue_head, entry);
3314 	} else if (s->matched_entry) {
3315 		/*
3316 		 * If the user has moved the cursor after we hit a match,
3317 		 * the position from where we should continue searching
3318 		 * might have changed.
3319 		 */
3320 		if (view->searching == TOG_SEARCH_FORWARD)
3321 			entry = TAILQ_NEXT(s->selected_entry, entry);
3322 		else
3323 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3324 			    entry);
3325 	} else {
3326 		entry = s->selected_entry;
3327 	}
3328 
3329 	while (1) {
3330 		int have_match = 0;
3331 
3332 		if (entry == NULL) {
3333 			if (s->thread_args.log_complete ||
3334 			    view->searching == TOG_SEARCH_BACKWARD) {
3335 				view->search_next_done =
3336 				    (s->matched_entry == NULL ?
3337 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3338 				s->search_entry = NULL;
3339 				return NULL;
3340 			}
3341 			/*
3342 			 * Poke the log thread for more commits and return,
3343 			 * allowing the main loop to make progress. Search
3344 			 * will resume at s->search_entry once we come back.
3345 			 */
3346 			s->thread_args.commits_needed++;
3347 			return trigger_log_thread(view, 0);
3348 		}
3349 
3350 		err = match_commit(&have_match, entry->id, entry->commit,
3351 		    &view->regex);
3352 		if (err)
3353 			break;
3354 		if (have_match) {
3355 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3356 			s->matched_entry = entry;
3357 			break;
3358 		}
3359 
3360 		s->search_entry = entry;
3361 		if (view->searching == TOG_SEARCH_FORWARD)
3362 			entry = TAILQ_NEXT(entry, entry);
3363 		else
3364 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3365 	}
3366 
3367 	if (s->matched_entry) {
3368 		int cur = s->selected_entry->idx;
3369 		while (cur < s->matched_entry->idx) {
3370 			err = input_log_view(NULL, view, KEY_DOWN);
3371 			if (err)
3372 				return err;
3373 			cur++;
3374 		}
3375 		while (cur > s->matched_entry->idx) {
3376 			err = input_log_view(NULL, view, KEY_UP);
3377 			if (err)
3378 				return err;
3379 			cur--;
3380 		}
3381 	}
3382 
3383 	s->search_entry = NULL;
3384 
3385 	return NULL;
3386 }
3387 
3388 static const struct got_error *
3389 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3390     struct got_repository *repo, const char *head_ref_name,
3391     const char *in_repo_path, int log_branches)
3392 {
3393 	const struct got_error *err = NULL;
3394 	struct tog_log_view_state *s = &view->state.log;
3395 	struct got_repository *thread_repo = NULL;
3396 	struct got_commit_graph *thread_graph = NULL;
3397 	int errcode;
3398 
3399 	if (in_repo_path != s->in_repo_path) {
3400 		free(s->in_repo_path);
3401 		s->in_repo_path = strdup(in_repo_path);
3402 		if (s->in_repo_path == NULL)
3403 			return got_error_from_errno("strdup");
3404 	}
3405 
3406 	/* The commit queue only contains commits being displayed. */
3407 	TAILQ_INIT(&s->real_commits.head);
3408 	s->real_commits.ncommits = 0;
3409 	s->commits = &s->real_commits;
3410 
3411 	TAILQ_INIT(&s->limit_commits.head);
3412 	s->limit_view = 0;
3413 	s->limit_commits.ncommits = 0;
3414 
3415 	s->repo = repo;
3416 	if (head_ref_name) {
3417 		s->head_ref_name = strdup(head_ref_name);
3418 		if (s->head_ref_name == NULL) {
3419 			err = got_error_from_errno("strdup");
3420 			goto done;
3421 		}
3422 	}
3423 	s->start_id = got_object_id_dup(start_id);
3424 	if (s->start_id == NULL) {
3425 		err = got_error_from_errno("got_object_id_dup");
3426 		goto done;
3427 	}
3428 	s->log_branches = log_branches;
3429 	s->use_committer = 1;
3430 
3431 	STAILQ_INIT(&s->colors);
3432 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3433 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3434 		    get_color_value("TOG_COLOR_COMMIT"));
3435 		if (err)
3436 			goto done;
3437 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3438 		    get_color_value("TOG_COLOR_AUTHOR"));
3439 		if (err) {
3440 			free_colors(&s->colors);
3441 			goto done;
3442 		}
3443 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3444 		    get_color_value("TOG_COLOR_DATE"));
3445 		if (err) {
3446 			free_colors(&s->colors);
3447 			goto done;
3448 		}
3449 	}
3450 
3451 	view->show = show_log_view;
3452 	view->input = input_log_view;
3453 	view->resize = resize_log_view;
3454 	view->close = close_log_view;
3455 	view->search_start = search_start_log_view;
3456 	view->search_next = search_next_log_view;
3457 
3458 	if (s->thread_args.pack_fds == NULL) {
3459 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3460 		if (err)
3461 			goto done;
3462 	}
3463 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3464 	    s->thread_args.pack_fds);
3465 	if (err)
3466 		goto done;
3467 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3468 	    !s->log_branches);
3469 	if (err)
3470 		goto done;
3471 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3472 	    s->repo, NULL, NULL);
3473 	if (err)
3474 		goto done;
3475 
3476 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3477 	if (errcode) {
3478 		err = got_error_set_errno(errcode, "pthread_cond_init");
3479 		goto done;
3480 	}
3481 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3482 	if (errcode) {
3483 		err = got_error_set_errno(errcode, "pthread_cond_init");
3484 		goto done;
3485 	}
3486 
3487 	s->thread_args.commits_needed = view->nlines;
3488 	s->thread_args.graph = thread_graph;
3489 	s->thread_args.real_commits = &s->real_commits;
3490 	s->thread_args.limit_commits = &s->limit_commits;
3491 	s->thread_args.in_repo_path = s->in_repo_path;
3492 	s->thread_args.start_id = s->start_id;
3493 	s->thread_args.repo = thread_repo;
3494 	s->thread_args.log_complete = 0;
3495 	s->thread_args.quit = &s->quit;
3496 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3497 	s->thread_args.selected_entry = &s->selected_entry;
3498 	s->thread_args.searching = &view->searching;
3499 	s->thread_args.search_next_done = &view->search_next_done;
3500 	s->thread_args.regex = &view->regex;
3501 	s->thread_args.limiting = &s->limit_view;
3502 	s->thread_args.limit_regex = &s->limit_regex;
3503 	s->thread_args.limit_commits = &s->limit_commits;
3504 done:
3505 	if (err)
3506 		close_log_view(view);
3507 	return err;
3508 }
3509 
3510 static const struct got_error *
3511 show_log_view(struct tog_view *view)
3512 {
3513 	const struct got_error *err;
3514 	struct tog_log_view_state *s = &view->state.log;
3515 
3516 	if (s->thread == 0) { //NULL) {
3517 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3518 		    &s->thread_args);
3519 		if (errcode)
3520 			return got_error_set_errno(errcode, "pthread_create");
3521 		if (s->thread_args.commits_needed > 0) {
3522 			err = trigger_log_thread(view, 1);
3523 			if (err)
3524 				return err;
3525 		}
3526 	}
3527 
3528 	return draw_commits(view);
3529 }
3530 
3531 static void
3532 log_move_cursor_up(struct tog_view *view, int page, int home)
3533 {
3534 	struct tog_log_view_state *s = &view->state.log;
3535 
3536 	if (s->first_displayed_entry == NULL)
3537 		return;
3538 	if (s->selected_entry->idx == 0)
3539 		view->count = 0;
3540 
3541 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3542 	    || home)
3543 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3544 
3545 	if (!page && !home && s->selected > 0)
3546 		--s->selected;
3547 	else
3548 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3549 
3550 	select_commit(s);
3551 	return;
3552 }
3553 
3554 static const struct got_error *
3555 log_move_cursor_down(struct tog_view *view, int page)
3556 {
3557 	struct tog_log_view_state	*s = &view->state.log;
3558 	const struct got_error		*err = NULL;
3559 	int				 eos = view->nlines - 2;
3560 
3561 	if (s->first_displayed_entry == NULL)
3562 		return NULL;
3563 
3564 	if (s->thread_args.log_complete &&
3565 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3566 		return NULL;
3567 
3568 	if (view_is_hsplit_top(view))
3569 		--eos;  /* border consumes the last line */
3570 
3571 	if (!page) {
3572 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3573 			++s->selected;
3574 		else
3575 			err = log_scroll_down(view, 1);
3576 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3577 		struct commit_queue_entry *entry;
3578 		int n;
3579 
3580 		s->selected = 0;
3581 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3582 		s->last_displayed_entry = entry;
3583 		for (n = 0; n <= eos; n++) {
3584 			if (entry == NULL)
3585 				break;
3586 			s->first_displayed_entry = entry;
3587 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3588 		}
3589 		if (n > 0)
3590 			s->selected = n - 1;
3591 	} else {
3592 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3593 		    s->thread_args.log_complete)
3594 			s->selected += MIN(page,
3595 			    s->commits->ncommits - s->selected_entry->idx - 1);
3596 		else
3597 			err = log_scroll_down(view, page);
3598 	}
3599 	if (err)
3600 		return err;
3601 
3602 	/*
3603 	 * We might necessarily overshoot in horizontal
3604 	 * splits; if so, select the last displayed commit.
3605 	 */
3606 	if (s->first_displayed_entry && s->last_displayed_entry) {
3607 		s->selected = MIN(s->selected,
3608 		    s->last_displayed_entry->idx -
3609 		    s->first_displayed_entry->idx);
3610 	}
3611 
3612 	select_commit(s);
3613 
3614 	if (s->thread_args.log_complete &&
3615 	    s->selected_entry->idx == s->commits->ncommits - 1)
3616 		view->count = 0;
3617 
3618 	return NULL;
3619 }
3620 
3621 static void
3622 view_get_split(struct tog_view *view, int *y, int *x)
3623 {
3624 	*x = 0;
3625 	*y = 0;
3626 
3627 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3628 		if (view->child && view->child->resized_y)
3629 			*y = view->child->resized_y;
3630 		else if (view->resized_y)
3631 			*y = view->resized_y;
3632 		else
3633 			*y = view_split_begin_y(view->lines);
3634 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3635 		if (view->child && view->child->resized_x)
3636 			*x = view->child->resized_x;
3637 		else if (view->resized_x)
3638 			*x = view->resized_x;
3639 		else
3640 			*x = view_split_begin_x(view->begin_x);
3641 	}
3642 }
3643 
3644 /* Split view horizontally at y and offset view->state->selected line. */
3645 static const struct got_error *
3646 view_init_hsplit(struct tog_view *view, int y)
3647 {
3648 	const struct got_error *err = NULL;
3649 
3650 	view->nlines = y;
3651 	view->ncols = COLS;
3652 	err = view_resize(view);
3653 	if (err)
3654 		return err;
3655 
3656 	err = offset_selection_down(view);
3657 
3658 	return err;
3659 }
3660 
3661 static const struct got_error *
3662 log_goto_line(struct tog_view *view, int nlines)
3663 {
3664 	const struct got_error		*err = NULL;
3665 	struct tog_log_view_state	*s = &view->state.log;
3666 	int				 g, idx = s->selected_entry->idx;
3667 
3668 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3669 		return NULL;
3670 
3671 	g = view->gline;
3672 	view->gline = 0;
3673 
3674 	if (g >= s->first_displayed_entry->idx + 1 &&
3675 	    g <= s->last_displayed_entry->idx + 1 &&
3676 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3677 		s->selected = g - s->first_displayed_entry->idx - 1;
3678 		select_commit(s);
3679 		return NULL;
3680 	}
3681 
3682 	if (idx + 1 < g) {
3683 		err = log_move_cursor_down(view, g - idx - 1);
3684 		if (!err && g > s->selected_entry->idx + 1)
3685 			err = log_move_cursor_down(view,
3686 			    g - s->first_displayed_entry->idx - 1);
3687 		if (err)
3688 			return err;
3689 	} else if (idx + 1 > g)
3690 		log_move_cursor_up(view, idx - g + 1, 0);
3691 
3692 	if (g < nlines && s->first_displayed_entry->idx == 0)
3693 		s->selected = g - 1;
3694 
3695 	select_commit(s);
3696 	return NULL;
3697 
3698 }
3699 
3700 static void
3701 horizontal_scroll_input(struct tog_view *view, int ch)
3702 {
3703 
3704 	switch (ch) {
3705 	case KEY_LEFT:
3706 	case 'h':
3707 		view->x -= MIN(view->x, 2);
3708 		if (view->x <= 0)
3709 			view->count = 0;
3710 		break;
3711 	case KEY_RIGHT:
3712 	case 'l':
3713 		if (view->x + view->ncols / 2 < view->maxx)
3714 			view->x += 2;
3715 		else
3716 			view->count = 0;
3717 		break;
3718 	case '0':
3719 		view->x = 0;
3720 		break;
3721 	case '$':
3722 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3723 		view->count = 0;
3724 		break;
3725 	default:
3726 		break;
3727 	}
3728 }
3729 
3730 static const struct got_error *
3731 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3732 {
3733 	const struct got_error *err = NULL;
3734 	struct tog_log_view_state *s = &view->state.log;
3735 	int eos, nscroll;
3736 
3737 	if (s->thread_args.load_all) {
3738 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3739 			s->thread_args.load_all = 0;
3740 		else if (s->thread_args.log_complete) {
3741 			err = log_move_cursor_down(view, s->commits->ncommits);
3742 			s->thread_args.load_all = 0;
3743 		}
3744 		if (err)
3745 			return err;
3746 	}
3747 
3748 	eos = nscroll = view->nlines - 1;
3749 	if (view_is_hsplit_top(view))
3750 		--eos;  /* border */
3751 
3752 	if (view->gline)
3753 		return log_goto_line(view, eos);
3754 
3755 	switch (ch) {
3756 	case '&':
3757 		err = limit_log_view(view);
3758 		break;
3759 	case 'q':
3760 		s->quit = 1;
3761 		break;
3762 	case '0':
3763 	case '$':
3764 	case KEY_RIGHT:
3765 	case 'l':
3766 	case KEY_LEFT:
3767 	case 'h':
3768 		horizontal_scroll_input(view, ch);
3769 		break;
3770 	case 'k':
3771 	case KEY_UP:
3772 	case '<':
3773 	case ',':
3774 	case CTRL('p'):
3775 		log_move_cursor_up(view, 0, 0);
3776 		break;
3777 	case 'g':
3778 	case '=':
3779 	case KEY_HOME:
3780 		log_move_cursor_up(view, 0, 1);
3781 		view->count = 0;
3782 		break;
3783 	case CTRL('u'):
3784 	case 'u':
3785 		nscroll /= 2;
3786 		/* FALL THROUGH */
3787 	case KEY_PPAGE:
3788 	case CTRL('b'):
3789 	case 'b':
3790 		log_move_cursor_up(view, nscroll, 0);
3791 		break;
3792 	case 'j':
3793 	case KEY_DOWN:
3794 	case '>':
3795 	case '.':
3796 	case CTRL('n'):
3797 		err = log_move_cursor_down(view, 0);
3798 		break;
3799 	case '@':
3800 		s->use_committer = !s->use_committer;
3801 		view->action = s->use_committer ?
3802 		    "show committer" : "show commit author";
3803 		break;
3804 	case 'G':
3805 	case '*':
3806 	case KEY_END: {
3807 		/* We don't know yet how many commits, so we're forced to
3808 		 * traverse them all. */
3809 		view->count = 0;
3810 		s->thread_args.load_all = 1;
3811 		if (!s->thread_args.log_complete)
3812 			return trigger_log_thread(view, 0);
3813 		err = log_move_cursor_down(view, s->commits->ncommits);
3814 		s->thread_args.load_all = 0;
3815 		break;
3816 	}
3817 	case CTRL('d'):
3818 	case 'd':
3819 		nscroll /= 2;
3820 		/* FALL THROUGH */
3821 	case KEY_NPAGE:
3822 	case CTRL('f'):
3823 	case 'f':
3824 	case ' ':
3825 		err = log_move_cursor_down(view, nscroll);
3826 		break;
3827 	case KEY_RESIZE:
3828 		if (s->selected > view->nlines - 2)
3829 			s->selected = view->nlines - 2;
3830 		if (s->selected > s->commits->ncommits - 1)
3831 			s->selected = s->commits->ncommits - 1;
3832 		select_commit(s);
3833 		if (s->commits->ncommits < view->nlines - 1 &&
3834 		    !s->thread_args.log_complete) {
3835 			s->thread_args.commits_needed += (view->nlines - 1) -
3836 			    s->commits->ncommits;
3837 			err = trigger_log_thread(view, 1);
3838 		}
3839 		break;
3840 	case KEY_ENTER:
3841 	case '\r':
3842 		view->count = 0;
3843 		if (s->selected_entry == NULL)
3844 			break;
3845 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3846 		break;
3847 	case 'T':
3848 		view->count = 0;
3849 		if (s->selected_entry == NULL)
3850 			break;
3851 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3852 		break;
3853 	case KEY_BACKSPACE:
3854 	case CTRL('l'):
3855 	case 'B':
3856 		view->count = 0;
3857 		if (ch == KEY_BACKSPACE &&
3858 		    got_path_is_root_dir(s->in_repo_path))
3859 			break;
3860 		err = stop_log_thread(s);
3861 		if (err)
3862 			return err;
3863 		if (ch == KEY_BACKSPACE) {
3864 			char *parent_path;
3865 			err = got_path_dirname(&parent_path, s->in_repo_path);
3866 			if (err)
3867 				return err;
3868 			free(s->in_repo_path);
3869 			s->in_repo_path = parent_path;
3870 			s->thread_args.in_repo_path = s->in_repo_path;
3871 		} else if (ch == CTRL('l')) {
3872 			struct got_object_id *start_id;
3873 			err = got_repo_match_object_id(&start_id, NULL,
3874 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3875 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3876 			if (err) {
3877 				if (s->head_ref_name == NULL ||
3878 				    err->code != GOT_ERR_NOT_REF)
3879 					return err;
3880 				/* Try to cope with deleted references. */
3881 				free(s->head_ref_name);
3882 				s->head_ref_name = NULL;
3883 				err = got_repo_match_object_id(&start_id,
3884 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3885 				    &tog_refs, s->repo);
3886 				if (err)
3887 					return err;
3888 			}
3889 			free(s->start_id);
3890 			s->start_id = start_id;
3891 			s->thread_args.start_id = s->start_id;
3892 		} else /* 'B' */
3893 			s->log_branches = !s->log_branches;
3894 
3895 		if (s->thread_args.pack_fds == NULL) {
3896 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3897 			if (err)
3898 				return err;
3899 		}
3900 		err = got_repo_open(&s->thread_args.repo,
3901 		    got_repo_get_path(s->repo), NULL,
3902 		    s->thread_args.pack_fds);
3903 		if (err)
3904 			return err;
3905 		tog_free_refs();
3906 		err = tog_load_refs(s->repo, 0);
3907 		if (err)
3908 			return err;
3909 		err = got_commit_graph_open(&s->thread_args.graph,
3910 		    s->in_repo_path, !s->log_branches);
3911 		if (err)
3912 			return err;
3913 		err = got_commit_graph_iter_start(s->thread_args.graph,
3914 		    s->start_id, s->repo, NULL, NULL);
3915 		if (err)
3916 			return err;
3917 		free_commits(&s->real_commits);
3918 		free_commits(&s->limit_commits);
3919 		s->first_displayed_entry = NULL;
3920 		s->last_displayed_entry = NULL;
3921 		s->selected_entry = NULL;
3922 		s->selected = 0;
3923 		s->thread_args.log_complete = 0;
3924 		s->quit = 0;
3925 		s->thread_args.commits_needed = view->lines;
3926 		s->matched_entry = NULL;
3927 		s->search_entry = NULL;
3928 		view->offset = 0;
3929 		break;
3930 	case 'R':
3931 		view->count = 0;
3932 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3933 		break;
3934 	default:
3935 		view->count = 0;
3936 		break;
3937 	}
3938 
3939 	return err;
3940 }
3941 
3942 static const struct got_error *
3943 apply_unveil(const char *repo_path, const char *worktree_path)
3944 {
3945 	const struct got_error *error;
3946 
3947 #ifdef PROFILE
3948 	if (unveil("gmon.out", "rwc") != 0)
3949 		return got_error_from_errno2("unveil", "gmon.out");
3950 #endif
3951 	if (repo_path && unveil(repo_path, "r") != 0)
3952 		return got_error_from_errno2("unveil", repo_path);
3953 
3954 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3955 		return got_error_from_errno2("unveil", worktree_path);
3956 
3957 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3958 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3959 
3960 	error = got_privsep_unveil_exec_helpers();
3961 	if (error != NULL)
3962 		return error;
3963 
3964 	if (unveil(NULL, NULL) != 0)
3965 		return got_error_from_errno("unveil");
3966 
3967 	return NULL;
3968 }
3969 
3970 static void
3971 init_curses(void)
3972 {
3973 	/*
3974 	 * Override default signal handlers before starting ncurses.
3975 	 * This should prevent ncurses from installing its own
3976 	 * broken cleanup() signal handler.
3977 	 */
3978 	signal(SIGWINCH, tog_sigwinch);
3979 	signal(SIGPIPE, tog_sigpipe);
3980 	signal(SIGCONT, tog_sigcont);
3981 	signal(SIGINT, tog_sigint);
3982 	signal(SIGTERM, tog_sigterm);
3983 
3984 	initscr();
3985 	cbreak();
3986 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3987 	noecho();
3988 	nonl();
3989 	intrflush(stdscr, FALSE);
3990 	keypad(stdscr, TRUE);
3991 	curs_set(0);
3992 	if (getenv("TOG_COLORS") != NULL) {
3993 		start_color();
3994 		use_default_colors();
3995 	}
3996 }
3997 
3998 static const struct got_error *
3999 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4000     struct got_repository *repo, struct got_worktree *worktree)
4001 {
4002 	const struct got_error *err = NULL;
4003 
4004 	if (argc == 0) {
4005 		*in_repo_path = strdup("/");
4006 		if (*in_repo_path == NULL)
4007 			return got_error_from_errno("strdup");
4008 		return NULL;
4009 	}
4010 
4011 	if (worktree) {
4012 		const char *prefix = got_worktree_get_path_prefix(worktree);
4013 		char *p;
4014 
4015 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4016 		if (err)
4017 			return err;
4018 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4019 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4020 		    p) == -1) {
4021 			err = got_error_from_errno("asprintf");
4022 			*in_repo_path = NULL;
4023 		}
4024 		free(p);
4025 	} else
4026 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4027 
4028 	return err;
4029 }
4030 
4031 static const struct got_error *
4032 cmd_log(int argc, char *argv[])
4033 {
4034 	const struct got_error *error;
4035 	struct got_repository *repo = NULL;
4036 	struct got_worktree *worktree = NULL;
4037 	struct got_object_id *start_id = NULL;
4038 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4039 	char *start_commit = NULL, *label = NULL;
4040 	struct got_reference *ref = NULL;
4041 	const char *head_ref_name = NULL;
4042 	int ch, log_branches = 0;
4043 	struct tog_view *view;
4044 	int *pack_fds = NULL;
4045 
4046 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4047 		switch (ch) {
4048 		case 'b':
4049 			log_branches = 1;
4050 			break;
4051 		case 'c':
4052 			start_commit = optarg;
4053 			break;
4054 		case 'r':
4055 			repo_path = realpath(optarg, NULL);
4056 			if (repo_path == NULL)
4057 				return got_error_from_errno2("realpath",
4058 				    optarg);
4059 			break;
4060 		default:
4061 			usage_log();
4062 			/* NOTREACHED */
4063 		}
4064 	}
4065 
4066 	argc -= optind;
4067 	argv += optind;
4068 
4069 	if (argc > 1)
4070 		usage_log();
4071 
4072 	error = got_repo_pack_fds_open(&pack_fds);
4073 	if (error != NULL)
4074 		goto done;
4075 
4076 	if (repo_path == NULL) {
4077 		cwd = getcwd(NULL, 0);
4078 		if (cwd == NULL)
4079 			return got_error_from_errno("getcwd");
4080 		error = got_worktree_open(&worktree, cwd);
4081 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4082 			goto done;
4083 		if (worktree)
4084 			repo_path =
4085 			    strdup(got_worktree_get_repo_path(worktree));
4086 		else
4087 			repo_path = strdup(cwd);
4088 		if (repo_path == NULL) {
4089 			error = got_error_from_errno("strdup");
4090 			goto done;
4091 		}
4092 	}
4093 
4094 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4095 	if (error != NULL)
4096 		goto done;
4097 
4098 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4099 	    repo, worktree);
4100 	if (error)
4101 		goto done;
4102 
4103 	init_curses();
4104 
4105 	error = apply_unveil(got_repo_get_path(repo),
4106 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4107 	if (error)
4108 		goto done;
4109 
4110 	/* already loaded by tog_log_with_path()? */
4111 	if (TAILQ_EMPTY(&tog_refs)) {
4112 		error = tog_load_refs(repo, 0);
4113 		if (error)
4114 			goto done;
4115 	}
4116 
4117 	if (start_commit == NULL) {
4118 		error = got_repo_match_object_id(&start_id, &label,
4119 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4120 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4121 		if (error)
4122 			goto done;
4123 		head_ref_name = label;
4124 	} else {
4125 		error = got_ref_open(&ref, repo, start_commit, 0);
4126 		if (error == NULL)
4127 			head_ref_name = got_ref_get_name(ref);
4128 		else if (error->code != GOT_ERR_NOT_REF)
4129 			goto done;
4130 		error = got_repo_match_object_id(&start_id, NULL,
4131 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4132 		if (error)
4133 			goto done;
4134 	}
4135 
4136 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4137 	if (view == NULL) {
4138 		error = got_error_from_errno("view_open");
4139 		goto done;
4140 	}
4141 	error = open_log_view(view, start_id, repo, head_ref_name,
4142 	    in_repo_path, log_branches);
4143 	if (error)
4144 		goto done;
4145 	if (worktree) {
4146 		/* Release work tree lock. */
4147 		got_worktree_close(worktree);
4148 		worktree = NULL;
4149 	}
4150 	error = view_loop(view);
4151 done:
4152 	free(in_repo_path);
4153 	free(repo_path);
4154 	free(cwd);
4155 	free(start_id);
4156 	free(label);
4157 	if (ref)
4158 		got_ref_close(ref);
4159 	if (repo) {
4160 		const struct got_error *close_err = got_repo_close(repo);
4161 		if (error == NULL)
4162 			error = close_err;
4163 	}
4164 	if (worktree)
4165 		got_worktree_close(worktree);
4166 	if (pack_fds) {
4167 		const struct got_error *pack_err =
4168 		    got_repo_pack_fds_close(pack_fds);
4169 		if (error == NULL)
4170 			error = pack_err;
4171 	}
4172 	tog_free_refs();
4173 	return error;
4174 }
4175 
4176 __dead static void
4177 usage_diff(void)
4178 {
4179 	endwin();
4180 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4181 	    "object1 object2\n", getprogname());
4182 	exit(1);
4183 }
4184 
4185 static int
4186 match_line(const char *line, regex_t *regex, size_t nmatch,
4187     regmatch_t *regmatch)
4188 {
4189 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4190 }
4191 
4192 static struct tog_color *
4193 match_color(struct tog_colors *colors, const char *line)
4194 {
4195 	struct tog_color *tc = NULL;
4196 
4197 	STAILQ_FOREACH(tc, colors, entry) {
4198 		if (match_line(line, &tc->regex, 0, NULL))
4199 			return tc;
4200 	}
4201 
4202 	return NULL;
4203 }
4204 
4205 static const struct got_error *
4206 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4207     WINDOW *window, int skipcol, regmatch_t *regmatch)
4208 {
4209 	const struct got_error *err = NULL;
4210 	char *exstr = NULL;
4211 	wchar_t *wline = NULL;
4212 	int rme, rms, n, width, scrollx;
4213 	int width0 = 0, width1 = 0, width2 = 0;
4214 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4215 
4216 	*wtotal = 0;
4217 
4218 	rms = regmatch->rm_so;
4219 	rme = regmatch->rm_eo;
4220 
4221 	err = expand_tab(&exstr, line);
4222 	if (err)
4223 		return err;
4224 
4225 	/* Split the line into 3 segments, according to match offsets. */
4226 	seg0 = strndup(exstr, rms);
4227 	if (seg0 == NULL) {
4228 		err = got_error_from_errno("strndup");
4229 		goto done;
4230 	}
4231 	seg1 = strndup(exstr + rms, rme - rms);
4232 	if (seg1 == NULL) {
4233 		err = got_error_from_errno("strndup");
4234 		goto done;
4235 	}
4236 	seg2 = strdup(exstr + rme);
4237 	if (seg2 == NULL) {
4238 		err = got_error_from_errno("strndup");
4239 		goto done;
4240 	}
4241 
4242 	/* draw up to matched token if we haven't scrolled past it */
4243 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4244 	    col_tab_align, 1);
4245 	if (err)
4246 		goto done;
4247 	n = MAX(width0 - skipcol, 0);
4248 	if (n) {
4249 		free(wline);
4250 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4251 		    wlimit, col_tab_align, 1);
4252 		if (err)
4253 			goto done;
4254 		waddwstr(window, &wline[scrollx]);
4255 		wlimit -= width;
4256 		*wtotal += width;
4257 	}
4258 
4259 	if (wlimit > 0) {
4260 		int i = 0, w = 0;
4261 		size_t wlen;
4262 
4263 		free(wline);
4264 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4265 		    col_tab_align, 1);
4266 		if (err)
4267 			goto done;
4268 		wlen = wcslen(wline);
4269 		while (i < wlen) {
4270 			width = wcwidth(wline[i]);
4271 			if (width == -1) {
4272 				/* should not happen, tabs are expanded */
4273 				err = got_error(GOT_ERR_RANGE);
4274 				goto done;
4275 			}
4276 			if (width0 + w + width > skipcol)
4277 				break;
4278 			w += width;
4279 			i++;
4280 		}
4281 		/* draw (visible part of) matched token (if scrolled into it) */
4282 		if (width1 - w > 0) {
4283 			wattron(window, A_STANDOUT);
4284 			waddwstr(window, &wline[i]);
4285 			wattroff(window, A_STANDOUT);
4286 			wlimit -= (width1 - w);
4287 			*wtotal += (width1 - w);
4288 		}
4289 	}
4290 
4291 	if (wlimit > 0) {  /* draw rest of line */
4292 		free(wline);
4293 		if (skipcol > width0 + width1) {
4294 			err = format_line(&wline, &width2, &scrollx, seg2,
4295 			    skipcol - (width0 + width1), wlimit,
4296 			    col_tab_align, 1);
4297 			if (err)
4298 				goto done;
4299 			waddwstr(window, &wline[scrollx]);
4300 		} else {
4301 			err = format_line(&wline, &width2, NULL, seg2, 0,
4302 			    wlimit, col_tab_align, 1);
4303 			if (err)
4304 				goto done;
4305 			waddwstr(window, wline);
4306 		}
4307 		*wtotal += width2;
4308 	}
4309 done:
4310 	free(wline);
4311 	free(exstr);
4312 	free(seg0);
4313 	free(seg1);
4314 	free(seg2);
4315 	return err;
4316 }
4317 
4318 static int
4319 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4320 {
4321 	FILE	*f = NULL;
4322 	int	*eof, *first, *selected;
4323 
4324 	if (view->type == TOG_VIEW_DIFF) {
4325 		struct tog_diff_view_state *s = &view->state.diff;
4326 
4327 		first = &s->first_displayed_line;
4328 		selected = first;
4329 		eof = &s->eof;
4330 		f = s->f;
4331 	} else if (view->type == TOG_VIEW_HELP) {
4332 		struct tog_help_view_state *s = &view->state.help;
4333 
4334 		first = &s->first_displayed_line;
4335 		selected = first;
4336 		eof = &s->eof;
4337 		f = s->f;
4338 	} else if (view->type == TOG_VIEW_BLAME) {
4339 		struct tog_blame_view_state *s = &view->state.blame;
4340 
4341 		first = &s->first_displayed_line;
4342 		selected = &s->selected_line;
4343 		eof = &s->eof;
4344 		f = s->blame.f;
4345 	} else
4346 		return 0;
4347 
4348 	/* Center gline in the middle of the page like vi(1). */
4349 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4350 		return 0;
4351 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4352 		rewind(f);
4353 		*eof = 0;
4354 		*first = 1;
4355 		*lineno = 0;
4356 		*nprinted = 0;
4357 		return 0;
4358 	}
4359 
4360 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4361 		view->gline : (view->nlines - 3) / 2 + 1;
4362 	view->gline = 0;
4363 
4364 	return 1;
4365 }
4366 
4367 static const struct got_error *
4368 draw_file(struct tog_view *view, const char *header)
4369 {
4370 	struct tog_diff_view_state *s = &view->state.diff;
4371 	regmatch_t *regmatch = &view->regmatch;
4372 	const struct got_error *err;
4373 	int nprinted = 0;
4374 	char *line;
4375 	size_t linesize = 0;
4376 	ssize_t linelen;
4377 	wchar_t *wline;
4378 	int width;
4379 	int max_lines = view->nlines;
4380 	int nlines = s->nlines;
4381 	off_t line_offset;
4382 
4383 	s->lineno = s->first_displayed_line - 1;
4384 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4385 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4386 		return got_error_from_errno("fseek");
4387 
4388 	werase(view->window);
4389 
4390 	if (view->gline > s->nlines - 1)
4391 		view->gline = s->nlines - 1;
4392 
4393 	if (header) {
4394 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4395 		    1 : view->gline - (view->nlines - 3) / 2 :
4396 		    s->lineno + s->selected_line;
4397 
4398 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4399 			return got_error_from_errno("asprintf");
4400 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4401 		    0, 0);
4402 		free(line);
4403 		if (err)
4404 			return err;
4405 
4406 		if (view_needs_focus_indication(view))
4407 			wstandout(view->window);
4408 		waddwstr(view->window, wline);
4409 		free(wline);
4410 		wline = NULL;
4411 		while (width++ < view->ncols)
4412 			waddch(view->window, ' ');
4413 		if (view_needs_focus_indication(view))
4414 			wstandend(view->window);
4415 
4416 		if (max_lines <= 1)
4417 			return NULL;
4418 		max_lines--;
4419 	}
4420 
4421 	s->eof = 0;
4422 	view->maxx = 0;
4423 	line = NULL;
4424 	while (max_lines > 0 && nprinted < max_lines) {
4425 		enum got_diff_line_type linetype;
4426 		attr_t attr = 0;
4427 
4428 		linelen = getline(&line, &linesize, s->f);
4429 		if (linelen == -1) {
4430 			if (feof(s->f)) {
4431 				s->eof = 1;
4432 				break;
4433 			}
4434 			free(line);
4435 			return got_ferror(s->f, GOT_ERR_IO);
4436 		}
4437 
4438 		if (++s->lineno < s->first_displayed_line)
4439 			continue;
4440 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4441 			continue;
4442 		if (s->lineno == view->hiline)
4443 			attr = A_STANDOUT;
4444 
4445 		/* Set view->maxx based on full line length. */
4446 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4447 		    view->x ? 1 : 0);
4448 		if (err) {
4449 			free(line);
4450 			return err;
4451 		}
4452 		view->maxx = MAX(view->maxx, width);
4453 		free(wline);
4454 		wline = NULL;
4455 
4456 		linetype = s->lines[s->lineno].type;
4457 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4458 		    linetype < GOT_DIFF_LINE_CONTEXT)
4459 			attr |= COLOR_PAIR(linetype);
4460 		if (attr)
4461 			wattron(view->window, attr);
4462 		if (s->first_displayed_line + nprinted == s->matched_line &&
4463 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4464 			err = add_matched_line(&width, line, view->ncols, 0,
4465 			    view->window, view->x, regmatch);
4466 			if (err) {
4467 				free(line);
4468 				return err;
4469 			}
4470 		} else {
4471 			int skip;
4472 			err = format_line(&wline, &width, &skip, line,
4473 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4474 			if (err) {
4475 				free(line);
4476 				return err;
4477 			}
4478 			waddwstr(view->window, &wline[skip]);
4479 			free(wline);
4480 			wline = NULL;
4481 		}
4482 		if (s->lineno == view->hiline) {
4483 			/* highlight full gline length */
4484 			while (width++ < view->ncols)
4485 				waddch(view->window, ' ');
4486 		} else {
4487 			if (width <= view->ncols - 1)
4488 				waddch(view->window, '\n');
4489 		}
4490 		if (attr)
4491 			wattroff(view->window, attr);
4492 		if (++nprinted == 1)
4493 			s->first_displayed_line = s->lineno;
4494 	}
4495 	free(line);
4496 	if (nprinted >= 1)
4497 		s->last_displayed_line = s->first_displayed_line +
4498 		    (nprinted - 1);
4499 	else
4500 		s->last_displayed_line = s->first_displayed_line;
4501 
4502 	view_border(view);
4503 
4504 	if (s->eof) {
4505 		while (nprinted < view->nlines) {
4506 			waddch(view->window, '\n');
4507 			nprinted++;
4508 		}
4509 
4510 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4511 		    view->ncols, 0, 0);
4512 		if (err) {
4513 			return err;
4514 		}
4515 
4516 		wstandout(view->window);
4517 		waddwstr(view->window, wline);
4518 		free(wline);
4519 		wline = NULL;
4520 		wstandend(view->window);
4521 	}
4522 
4523 	return NULL;
4524 }
4525 
4526 static char *
4527 get_datestr(time_t *time, char *datebuf)
4528 {
4529 	struct tm mytm, *tm;
4530 	char *p, *s;
4531 
4532 	tm = gmtime_r(time, &mytm);
4533 	if (tm == NULL)
4534 		return NULL;
4535 	s = asctime_r(tm, datebuf);
4536 	if (s == NULL)
4537 		return NULL;
4538 	p = strchr(s, '\n');
4539 	if (p)
4540 		*p = '\0';
4541 	return s;
4542 }
4543 
4544 static const struct got_error *
4545 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4546     off_t off, uint8_t type)
4547 {
4548 	struct got_diff_line *p;
4549 
4550 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4551 	if (p == NULL)
4552 		return got_error_from_errno("reallocarray");
4553 	*lines = p;
4554 	(*lines)[*nlines].offset = off;
4555 	(*lines)[*nlines].type = type;
4556 	(*nlines)++;
4557 
4558 	return NULL;
4559 }
4560 
4561 static const struct got_error *
4562 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4563     struct got_diff_line *s_lines, size_t s_nlines)
4564 {
4565 	struct got_diff_line	*p;
4566 	char			 buf[BUFSIZ];
4567 	size_t			 i, r;
4568 
4569 	if (fseeko(src, 0L, SEEK_SET) == -1)
4570 		return got_error_from_errno("fseeko");
4571 
4572 	for (;;) {
4573 		r = fread(buf, 1, sizeof(buf), src);
4574 		if (r == 0) {
4575 			if (ferror(src))
4576 				return got_error_from_errno("fread");
4577 			if (feof(src))
4578 				break;
4579 		}
4580 		if (fwrite(buf, 1, r, dst) != r)
4581 			return got_ferror(dst, GOT_ERR_IO);
4582 	}
4583 
4584 	/*
4585 	 * The diff driver initialises the first line at offset zero when the
4586 	 * array isn't prepopulated, skip it; we already have it in *d_lines.
4587 	 */
4588 	for (i = 1; i < s_nlines; ++i)
4589 		s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4590 
4591 	--s_nlines;
4592 
4593 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4594 	if (p == NULL) {
4595 		/* d_lines is freed in close_diff_view() */
4596 		return got_error_from_errno("reallocarray");
4597 	}
4598 
4599 	*d_lines = p;
4600 
4601 	memcpy(*d_lines + *d_nlines, s_lines + 1, s_nlines * sizeof(*s_lines));
4602 	*d_nlines += s_nlines;
4603 
4604 	return NULL;
4605 }
4606 
4607 static const struct got_error *
4608 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4609     struct got_object_id *commit_id, struct got_reflist_head *refs,
4610     struct got_repository *repo, int ignore_ws, int force_text_diff,
4611     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4612 {
4613 	const struct got_error *err = NULL;
4614 	char datebuf[26], *datestr;
4615 	struct got_commit_object *commit;
4616 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4617 	time_t committer_time;
4618 	const char *author, *committer;
4619 	char *refs_str = NULL;
4620 	struct got_pathlist_entry *pe;
4621 	off_t outoff = 0;
4622 	int n;
4623 
4624 	if (refs) {
4625 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4626 		if (err)
4627 			return err;
4628 	}
4629 
4630 	err = got_object_open_as_commit(&commit, repo, commit_id);
4631 	if (err)
4632 		return err;
4633 
4634 	err = got_object_id_str(&id_str, commit_id);
4635 	if (err) {
4636 		err = got_error_from_errno("got_object_id_str");
4637 		goto done;
4638 	}
4639 
4640 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4641 	if (err)
4642 		goto done;
4643 
4644 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4645 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4646 	if (n < 0) {
4647 		err = got_error_from_errno("fprintf");
4648 		goto done;
4649 	}
4650 	outoff += n;
4651 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4652 	if (err)
4653 		goto done;
4654 
4655 	n = fprintf(outfile, "from: %s\n",
4656 	    got_object_commit_get_author(commit));
4657 	if (n < 0) {
4658 		err = got_error_from_errno("fprintf");
4659 		goto done;
4660 	}
4661 	outoff += n;
4662 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4663 	if (err)
4664 		goto done;
4665 
4666 	author = got_object_commit_get_author(commit);
4667 	committer = got_object_commit_get_committer(commit);
4668 	if (strcmp(author, committer) != 0) {
4669 		n = fprintf(outfile, "via: %s\n", committer);
4670 		if (n < 0) {
4671 			err = got_error_from_errno("fprintf");
4672 			goto done;
4673 		}
4674 		outoff += n;
4675 		err = add_line_metadata(lines, nlines, outoff,
4676 		    GOT_DIFF_LINE_AUTHOR);
4677 		if (err)
4678 			goto done;
4679 	}
4680 	committer_time = got_object_commit_get_committer_time(commit);
4681 	datestr = get_datestr(&committer_time, datebuf);
4682 	if (datestr) {
4683 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4684 		if (n < 0) {
4685 			err = got_error_from_errno("fprintf");
4686 			goto done;
4687 		}
4688 		outoff += n;
4689 		err = add_line_metadata(lines, nlines, outoff,
4690 		    GOT_DIFF_LINE_DATE);
4691 		if (err)
4692 			goto done;
4693 	}
4694 	if (got_object_commit_get_nparents(commit) > 1) {
4695 		const struct got_object_id_queue *parent_ids;
4696 		struct got_object_qid *qid;
4697 		int pn = 1;
4698 		parent_ids = got_object_commit_get_parent_ids(commit);
4699 		STAILQ_FOREACH(qid, parent_ids, entry) {
4700 			err = got_object_id_str(&id_str, &qid->id);
4701 			if (err)
4702 				goto done;
4703 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4704 			if (n < 0) {
4705 				err = got_error_from_errno("fprintf");
4706 				goto done;
4707 			}
4708 			outoff += n;
4709 			err = add_line_metadata(lines, nlines, outoff,
4710 			    GOT_DIFF_LINE_META);
4711 			if (err)
4712 				goto done;
4713 			free(id_str);
4714 			id_str = NULL;
4715 		}
4716 	}
4717 
4718 	err = got_object_commit_get_logmsg(&logmsg, commit);
4719 	if (err)
4720 		goto done;
4721 	s = logmsg;
4722 	while ((line = strsep(&s, "\n")) != NULL) {
4723 		n = fprintf(outfile, "%s\n", line);
4724 		if (n < 0) {
4725 			err = got_error_from_errno("fprintf");
4726 			goto done;
4727 		}
4728 		outoff += n;
4729 		err = add_line_metadata(lines, nlines, outoff,
4730 		    GOT_DIFF_LINE_LOGMSG);
4731 		if (err)
4732 			goto done;
4733 	}
4734 
4735 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4736 		struct got_diff_changed_path *cp = pe->data;
4737 		int pad = dsa->max_path_len - pe->path_len + 1;
4738 
4739 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4740 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4741 		    dsa->rm_cols + 1, cp->rm);
4742 		if (n < 0) {
4743 			err = got_error_from_errno("fprintf");
4744 			goto done;
4745 		}
4746 		outoff += n;
4747 		err = add_line_metadata(lines, nlines, outoff,
4748 		    GOT_DIFF_LINE_CHANGES);
4749 		if (err)
4750 			goto done;
4751 	}
4752 
4753 	fputc('\n', outfile);
4754 	outoff++;
4755 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4756 	if (err)
4757 		goto done;
4758 
4759 	n = fprintf(outfile,
4760 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4761 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4762 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4763 	if (n < 0) {
4764 		err = got_error_from_errno("fprintf");
4765 		goto done;
4766 	}
4767 	outoff += n;
4768 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4769 	if (err)
4770 		goto done;
4771 
4772 	fputc('\n', outfile);
4773 	outoff++;
4774 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4775 done:
4776 	free(id_str);
4777 	free(logmsg);
4778 	free(refs_str);
4779 	got_object_commit_close(commit);
4780 	if (err) {
4781 		free(*lines);
4782 		*lines = NULL;
4783 		*nlines = 0;
4784 	}
4785 	return err;
4786 }
4787 
4788 static const struct got_error *
4789 create_diff(struct tog_diff_view_state *s)
4790 {
4791 	const struct got_error *err = NULL;
4792 	FILE *f = NULL, *tmp_diff_file = NULL;
4793 	int obj_type;
4794 	struct got_diff_line *lines = NULL;
4795 	struct got_pathlist_head changed_paths;
4796 
4797 	TAILQ_INIT(&changed_paths);
4798 
4799 	free(s->lines);
4800 	s->lines = malloc(sizeof(*s->lines));
4801 	if (s->lines == NULL)
4802 		return got_error_from_errno("malloc");
4803 	s->nlines = 0;
4804 
4805 	f = got_opentemp();
4806 	if (f == NULL) {
4807 		err = got_error_from_errno("got_opentemp");
4808 		goto done;
4809 	}
4810 	tmp_diff_file = got_opentemp();
4811 	if (tmp_diff_file == NULL) {
4812 		err = got_error_from_errno("got_opentemp");
4813 		goto done;
4814 	}
4815 	if (s->f && fclose(s->f) == EOF) {
4816 		err = got_error_from_errno("fclose");
4817 		goto done;
4818 	}
4819 	s->f = f;
4820 
4821 	if (s->id1)
4822 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4823 	else
4824 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4825 	if (err)
4826 		goto done;
4827 
4828 	switch (obj_type) {
4829 	case GOT_OBJ_TYPE_BLOB:
4830 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4831 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4832 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4833 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4834 		    s->f);
4835 		break;
4836 	case GOT_OBJ_TYPE_TREE:
4837 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4838 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4839 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4840 		    s->force_text_diff, NULL, s->repo, s->f);
4841 		break;
4842 	case GOT_OBJ_TYPE_COMMIT: {
4843 		const struct got_object_id_queue *parent_ids;
4844 		struct got_object_qid *pid;
4845 		struct got_commit_object *commit2;
4846 		struct got_reflist_head *refs;
4847 		size_t nlines = 0;
4848 		struct got_diffstat_cb_arg dsa = {
4849 			0, 0, 0, 0, 0, 0,
4850 			&changed_paths,
4851 			s->ignore_whitespace,
4852 			s->force_text_diff,
4853 			tog_diff_algo
4854 		};
4855 
4856 		lines = malloc(sizeof(*lines));
4857 		if (lines == NULL) {
4858 			err = got_error_from_errno("malloc");
4859 			goto done;
4860 		}
4861 
4862 		/* build diff first in tmp file then append to commit info */
4863 		err = got_diff_objects_as_commits(&lines, &nlines,
4864 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4865 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4866 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4867 		if (err)
4868 			break;
4869 
4870 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4871 		if (err)
4872 			goto done;
4873 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4874 		/* Show commit info if we're diffing to a parent/root commit. */
4875 		if (s->id1 == NULL) {
4876 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4877 			    refs, s->repo, s->ignore_whitespace,
4878 			    s->force_text_diff, &dsa, s->f);
4879 			if (err)
4880 				goto done;
4881 		} else {
4882 			parent_ids = got_object_commit_get_parent_ids(commit2);
4883 			STAILQ_FOREACH(pid, parent_ids, entry) {
4884 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4885 					err = write_commit_info(&s->lines,
4886 					    &s->nlines, s->id2, refs, s->repo,
4887 					    s->ignore_whitespace,
4888 					    s->force_text_diff, &dsa, s->f);
4889 					if (err)
4890 						goto done;
4891 					break;
4892 				}
4893 			}
4894 		}
4895 		got_object_commit_close(commit2);
4896 
4897 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4898 		    lines, nlines);
4899 		break;
4900 	}
4901 	default:
4902 		err = got_error(GOT_ERR_OBJ_TYPE);
4903 		break;
4904 	}
4905 done:
4906 	free(lines);
4907 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4908 	if (s->f && fflush(s->f) != 0 && err == NULL)
4909 		err = got_error_from_errno("fflush");
4910 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4911 		err = got_error_from_errno("fclose");
4912 	return err;
4913 }
4914 
4915 static void
4916 diff_view_indicate_progress(struct tog_view *view)
4917 {
4918 	mvwaddstr(view->window, 0, 0, "diffing...");
4919 	update_panels();
4920 	doupdate();
4921 }
4922 
4923 static const struct got_error *
4924 search_start_diff_view(struct tog_view *view)
4925 {
4926 	struct tog_diff_view_state *s = &view->state.diff;
4927 
4928 	s->matched_line = 0;
4929 	return NULL;
4930 }
4931 
4932 static void
4933 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4934     size_t *nlines, int **first, int **last, int **match, int **selected)
4935 {
4936 	struct tog_diff_view_state *s = &view->state.diff;
4937 
4938 	*f = s->f;
4939 	*nlines = s->nlines;
4940 	*line_offsets = NULL;
4941 	*match = &s->matched_line;
4942 	*first = &s->first_displayed_line;
4943 	*last = &s->last_displayed_line;
4944 	*selected = &s->selected_line;
4945 }
4946 
4947 static const struct got_error *
4948 search_next_view_match(struct tog_view *view)
4949 {
4950 	const struct got_error *err = NULL;
4951 	FILE *f;
4952 	int lineno;
4953 	char *line = NULL;
4954 	size_t linesize = 0;
4955 	ssize_t linelen;
4956 	off_t *line_offsets;
4957 	size_t nlines = 0;
4958 	int *first, *last, *match, *selected;
4959 
4960 	if (!view->search_setup)
4961 		return got_error_msg(GOT_ERR_NOT_IMPL,
4962 		    "view search not supported");
4963 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4964 	    &match, &selected);
4965 
4966 	if (!view->searching) {
4967 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4968 		return NULL;
4969 	}
4970 
4971 	if (*match) {
4972 		if (view->searching == TOG_SEARCH_FORWARD)
4973 			lineno = *match + 1;
4974 		else
4975 			lineno = *match - 1;
4976 	} else
4977 		lineno = *first - 1 + *selected;
4978 
4979 	while (1) {
4980 		off_t offset;
4981 
4982 		if (lineno <= 0 || lineno > nlines) {
4983 			if (*match == 0) {
4984 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4985 				break;
4986 			}
4987 
4988 			if (view->searching == TOG_SEARCH_FORWARD)
4989 				lineno = 1;
4990 			else
4991 				lineno = nlines;
4992 		}
4993 
4994 		offset = view->type == TOG_VIEW_DIFF ?
4995 		    view->state.diff.lines[lineno - 1].offset :
4996 		    line_offsets[lineno - 1];
4997 		if (fseeko(f, offset, SEEK_SET) != 0) {
4998 			free(line);
4999 			return got_error_from_errno("fseeko");
5000 		}
5001 		linelen = getline(&line, &linesize, f);
5002 		if (linelen != -1) {
5003 			char *exstr;
5004 			err = expand_tab(&exstr, line);
5005 			if (err)
5006 				break;
5007 			if (match_line(exstr, &view->regex, 1,
5008 			    &view->regmatch)) {
5009 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5010 				*match = lineno;
5011 				free(exstr);
5012 				break;
5013 			}
5014 			free(exstr);
5015 		}
5016 		if (view->searching == TOG_SEARCH_FORWARD)
5017 			lineno++;
5018 		else
5019 			lineno--;
5020 	}
5021 	free(line);
5022 
5023 	if (*match) {
5024 		*first = *match;
5025 		*selected = 1;
5026 	}
5027 
5028 	return err;
5029 }
5030 
5031 static const struct got_error *
5032 close_diff_view(struct tog_view *view)
5033 {
5034 	const struct got_error *err = NULL;
5035 	struct tog_diff_view_state *s = &view->state.diff;
5036 
5037 	free(s->id1);
5038 	s->id1 = NULL;
5039 	free(s->id2);
5040 	s->id2 = NULL;
5041 	if (s->f && fclose(s->f) == EOF)
5042 		err = got_error_from_errno("fclose");
5043 	s->f = NULL;
5044 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5045 		err = got_error_from_errno("fclose");
5046 	s->f1 = NULL;
5047 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5048 		err = got_error_from_errno("fclose");
5049 	s->f2 = NULL;
5050 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5051 		err = got_error_from_errno("close");
5052 	s->fd1 = -1;
5053 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5054 		err = got_error_from_errno("close");
5055 	s->fd2 = -1;
5056 	free(s->lines);
5057 	s->lines = NULL;
5058 	s->nlines = 0;
5059 	return err;
5060 }
5061 
5062 static const struct got_error *
5063 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5064     struct got_object_id *id2, const char *label1, const char *label2,
5065     int diff_context, int ignore_whitespace, int force_text_diff,
5066     struct tog_view *parent_view, struct got_repository *repo)
5067 {
5068 	const struct got_error *err;
5069 	struct tog_diff_view_state *s = &view->state.diff;
5070 
5071 	memset(s, 0, sizeof(*s));
5072 	s->fd1 = -1;
5073 	s->fd2 = -1;
5074 
5075 	if (id1 != NULL && id2 != NULL) {
5076 	    int type1, type2;
5077 	    err = got_object_get_type(&type1, repo, id1);
5078 	    if (err)
5079 		return err;
5080 	    err = got_object_get_type(&type2, repo, id2);
5081 	    if (err)
5082 		return err;
5083 
5084 	    if (type1 != type2)
5085 		return got_error(GOT_ERR_OBJ_TYPE);
5086 	}
5087 	s->first_displayed_line = 1;
5088 	s->last_displayed_line = view->nlines;
5089 	s->selected_line = 1;
5090 	s->repo = repo;
5091 	s->id1 = id1;
5092 	s->id2 = id2;
5093 	s->label1 = label1;
5094 	s->label2 = label2;
5095 
5096 	if (id1) {
5097 		s->id1 = got_object_id_dup(id1);
5098 		if (s->id1 == NULL)
5099 			return got_error_from_errno("got_object_id_dup");
5100 	} else
5101 		s->id1 = NULL;
5102 
5103 	s->id2 = got_object_id_dup(id2);
5104 	if (s->id2 == NULL) {
5105 		err = got_error_from_errno("got_object_id_dup");
5106 		goto done;
5107 	}
5108 
5109 	s->f1 = got_opentemp();
5110 	if (s->f1 == NULL) {
5111 		err = got_error_from_errno("got_opentemp");
5112 		goto done;
5113 	}
5114 
5115 	s->f2 = got_opentemp();
5116 	if (s->f2 == NULL) {
5117 		err = got_error_from_errno("got_opentemp");
5118 		goto done;
5119 	}
5120 
5121 	s->fd1 = got_opentempfd();
5122 	if (s->fd1 == -1) {
5123 		err = got_error_from_errno("got_opentempfd");
5124 		goto done;
5125 	}
5126 
5127 	s->fd2 = got_opentempfd();
5128 	if (s->fd2 == -1) {
5129 		err = got_error_from_errno("got_opentempfd");
5130 		goto done;
5131 	}
5132 
5133 	s->diff_context = diff_context;
5134 	s->ignore_whitespace = ignore_whitespace;
5135 	s->force_text_diff = force_text_diff;
5136 	s->parent_view = parent_view;
5137 	s->repo = repo;
5138 
5139 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5140 		int rc;
5141 
5142 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5143 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5144 		if (rc != ERR)
5145 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5146 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5147 		if (rc != ERR)
5148 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5149 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5150 		if (rc != ERR)
5151 			rc = init_pair(GOT_DIFF_LINE_META,
5152 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5153 		if (rc != ERR)
5154 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5155 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5156 		if (rc != ERR)
5157 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5158 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5159 		if (rc != ERR)
5160 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5161 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5162 		if (rc != ERR)
5163 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5164 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5165 		if (rc != ERR)
5166 			rc = init_pair(GOT_DIFF_LINE_DATE,
5167 			    get_color_value("TOG_COLOR_DATE"), -1);
5168 		if (rc == ERR) {
5169 			err = got_error(GOT_ERR_RANGE);
5170 			goto done;
5171 		}
5172 	}
5173 
5174 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5175 	    view_is_splitscreen(view))
5176 		show_log_view(parent_view); /* draw border */
5177 	diff_view_indicate_progress(view);
5178 
5179 	err = create_diff(s);
5180 
5181 	view->show = show_diff_view;
5182 	view->input = input_diff_view;
5183 	view->reset = reset_diff_view;
5184 	view->close = close_diff_view;
5185 	view->search_start = search_start_diff_view;
5186 	view->search_setup = search_setup_diff_view;
5187 	view->search_next = search_next_view_match;
5188 done:
5189 	if (err)
5190 		close_diff_view(view);
5191 	return err;
5192 }
5193 
5194 static const struct got_error *
5195 show_diff_view(struct tog_view *view)
5196 {
5197 	const struct got_error *err;
5198 	struct tog_diff_view_state *s = &view->state.diff;
5199 	char *id_str1 = NULL, *id_str2, *header;
5200 	const char *label1, *label2;
5201 
5202 	if (s->id1) {
5203 		err = got_object_id_str(&id_str1, s->id1);
5204 		if (err)
5205 			return err;
5206 		label1 = s->label1 ? s->label1 : id_str1;
5207 	} else
5208 		label1 = "/dev/null";
5209 
5210 	err = got_object_id_str(&id_str2, s->id2);
5211 	if (err)
5212 		return err;
5213 	label2 = s->label2 ? s->label2 : id_str2;
5214 
5215 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5216 		err = got_error_from_errno("asprintf");
5217 		free(id_str1);
5218 		free(id_str2);
5219 		return err;
5220 	}
5221 	free(id_str1);
5222 	free(id_str2);
5223 
5224 	err = draw_file(view, header);
5225 	free(header);
5226 	return err;
5227 }
5228 
5229 static const struct got_error *
5230 set_selected_commit(struct tog_diff_view_state *s,
5231     struct commit_queue_entry *entry)
5232 {
5233 	const struct got_error *err;
5234 	const struct got_object_id_queue *parent_ids;
5235 	struct got_commit_object *selected_commit;
5236 	struct got_object_qid *pid;
5237 
5238 	free(s->id2);
5239 	s->id2 = got_object_id_dup(entry->id);
5240 	if (s->id2 == NULL)
5241 		return got_error_from_errno("got_object_id_dup");
5242 
5243 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5244 	if (err)
5245 		return err;
5246 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5247 	free(s->id1);
5248 	pid = STAILQ_FIRST(parent_ids);
5249 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5250 	got_object_commit_close(selected_commit);
5251 	return NULL;
5252 }
5253 
5254 static const struct got_error *
5255 reset_diff_view(struct tog_view *view)
5256 {
5257 	struct tog_diff_view_state *s = &view->state.diff;
5258 
5259 	view->count = 0;
5260 	wclear(view->window);
5261 	s->first_displayed_line = 1;
5262 	s->last_displayed_line = view->nlines;
5263 	s->matched_line = 0;
5264 	diff_view_indicate_progress(view);
5265 	return create_diff(s);
5266 }
5267 
5268 static void
5269 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5270 {
5271 	int start, i;
5272 
5273 	i = start = s->first_displayed_line - 1;
5274 
5275 	while (s->lines[i].type != type) {
5276 		if (i == 0)
5277 			i = s->nlines - 1;
5278 		if (--i == start)
5279 			return; /* do nothing, requested type not in file */
5280 	}
5281 
5282 	s->selected_line = 1;
5283 	s->first_displayed_line = i;
5284 }
5285 
5286 static void
5287 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5288 {
5289 	int start, i;
5290 
5291 	i = start = s->first_displayed_line + 1;
5292 
5293 	while (s->lines[i].type != type) {
5294 		if (i == s->nlines - 1)
5295 			i = 0;
5296 		if (++i == start)
5297 			return; /* do nothing, requested type not in file */
5298 	}
5299 
5300 	s->selected_line = 1;
5301 	s->first_displayed_line = i;
5302 }
5303 
5304 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5305     int, int, int);
5306 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5307     int, int);
5308 
5309 static const struct got_error *
5310 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5311 {
5312 	const struct got_error *err = NULL;
5313 	struct tog_diff_view_state *s = &view->state.diff;
5314 	struct tog_log_view_state *ls;
5315 	struct commit_queue_entry *old_selected_entry;
5316 	char *line = NULL;
5317 	size_t linesize = 0;
5318 	ssize_t linelen;
5319 	int i, nscroll = view->nlines - 1, up = 0;
5320 
5321 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5322 
5323 	switch (ch) {
5324 	case '0':
5325 	case '$':
5326 	case KEY_RIGHT:
5327 	case 'l':
5328 	case KEY_LEFT:
5329 	case 'h':
5330 		horizontal_scroll_input(view, ch);
5331 		break;
5332 	case 'a':
5333 	case 'w':
5334 		if (ch == 'a') {
5335 			s->force_text_diff = !s->force_text_diff;
5336 			view->action = s->force_text_diff ?
5337 			    "force ASCII text enabled" :
5338 			    "force ASCII text disabled";
5339 		}
5340 		else if (ch == 'w') {
5341 			s->ignore_whitespace = !s->ignore_whitespace;
5342 			view->action = s->ignore_whitespace ?
5343 			    "ignore whitespace enabled" :
5344 			    "ignore whitespace disabled";
5345 		}
5346 		err = reset_diff_view(view);
5347 		break;
5348 	case 'g':
5349 	case KEY_HOME:
5350 		s->first_displayed_line = 1;
5351 		view->count = 0;
5352 		break;
5353 	case 'G':
5354 	case KEY_END:
5355 		view->count = 0;
5356 		if (s->eof)
5357 			break;
5358 
5359 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5360 		s->eof = 1;
5361 		break;
5362 	case 'k':
5363 	case KEY_UP:
5364 	case CTRL('p'):
5365 		if (s->first_displayed_line > 1)
5366 			s->first_displayed_line--;
5367 		else
5368 			view->count = 0;
5369 		break;
5370 	case CTRL('u'):
5371 	case 'u':
5372 		nscroll /= 2;
5373 		/* FALL THROUGH */
5374 	case KEY_PPAGE:
5375 	case CTRL('b'):
5376 	case 'b':
5377 		if (s->first_displayed_line == 1) {
5378 			view->count = 0;
5379 			break;
5380 		}
5381 		i = 0;
5382 		while (i++ < nscroll && s->first_displayed_line > 1)
5383 			s->first_displayed_line--;
5384 		break;
5385 	case 'j':
5386 	case KEY_DOWN:
5387 	case CTRL('n'):
5388 		if (!s->eof)
5389 			s->first_displayed_line++;
5390 		else
5391 			view->count = 0;
5392 		break;
5393 	case CTRL('d'):
5394 	case 'd':
5395 		nscroll /= 2;
5396 		/* FALL THROUGH */
5397 	case KEY_NPAGE:
5398 	case CTRL('f'):
5399 	case 'f':
5400 	case ' ':
5401 		if (s->eof) {
5402 			view->count = 0;
5403 			break;
5404 		}
5405 		i = 0;
5406 		while (!s->eof && i++ < nscroll) {
5407 			linelen = getline(&line, &linesize, s->f);
5408 			s->first_displayed_line++;
5409 			if (linelen == -1) {
5410 				if (feof(s->f)) {
5411 					s->eof = 1;
5412 				} else
5413 					err = got_ferror(s->f, GOT_ERR_IO);
5414 				break;
5415 			}
5416 		}
5417 		free(line);
5418 		break;
5419 	case '(':
5420 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5421 		break;
5422 	case ')':
5423 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5424 		break;
5425 	case '{':
5426 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5427 		break;
5428 	case '}':
5429 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5430 		break;
5431 	case '[':
5432 		if (s->diff_context > 0) {
5433 			s->diff_context--;
5434 			s->matched_line = 0;
5435 			diff_view_indicate_progress(view);
5436 			err = create_diff(s);
5437 			if (s->first_displayed_line + view->nlines - 1 >
5438 			    s->nlines) {
5439 				s->first_displayed_line = 1;
5440 				s->last_displayed_line = view->nlines;
5441 			}
5442 		} else
5443 			view->count = 0;
5444 		break;
5445 	case ']':
5446 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5447 			s->diff_context++;
5448 			s->matched_line = 0;
5449 			diff_view_indicate_progress(view);
5450 			err = create_diff(s);
5451 		} else
5452 			view->count = 0;
5453 		break;
5454 	case '<':
5455 	case ',':
5456 	case 'K':
5457 		up = 1;
5458 		/* FALL THROUGH */
5459 	case '>':
5460 	case '.':
5461 	case 'J':
5462 		if (s->parent_view == NULL) {
5463 			view->count = 0;
5464 			break;
5465 		}
5466 		s->parent_view->count = view->count;
5467 
5468 		if (s->parent_view->type == TOG_VIEW_LOG) {
5469 			ls = &s->parent_view->state.log;
5470 			old_selected_entry = ls->selected_entry;
5471 
5472 			err = input_log_view(NULL, s->parent_view,
5473 			    up ? KEY_UP : KEY_DOWN);
5474 			if (err)
5475 				break;
5476 			view->count = s->parent_view->count;
5477 
5478 			if (old_selected_entry == ls->selected_entry)
5479 				break;
5480 
5481 			err = set_selected_commit(s, ls->selected_entry);
5482 			if (err)
5483 				break;
5484 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5485 			struct tog_blame_view_state *bs;
5486 			struct got_object_id *id, *prev_id;
5487 
5488 			bs = &s->parent_view->state.blame;
5489 			prev_id = get_annotation_for_line(bs->blame.lines,
5490 			    bs->blame.nlines, bs->last_diffed_line);
5491 
5492 			err = input_blame_view(&view, s->parent_view,
5493 			    up ? KEY_UP : KEY_DOWN);
5494 			if (err)
5495 				break;
5496 			view->count = s->parent_view->count;
5497 
5498 			if (prev_id == NULL)
5499 				break;
5500 			id = get_selected_commit_id(bs->blame.lines,
5501 			    bs->blame.nlines, bs->first_displayed_line,
5502 			    bs->selected_line);
5503 			if (id == NULL)
5504 				break;
5505 
5506 			if (!got_object_id_cmp(prev_id, id))
5507 				break;
5508 
5509 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5510 			if (err)
5511 				break;
5512 		}
5513 		s->first_displayed_line = 1;
5514 		s->last_displayed_line = view->nlines;
5515 		s->matched_line = 0;
5516 		view->x = 0;
5517 
5518 		diff_view_indicate_progress(view);
5519 		err = create_diff(s);
5520 		break;
5521 	default:
5522 		view->count = 0;
5523 		break;
5524 	}
5525 
5526 	return err;
5527 }
5528 
5529 static const struct got_error *
5530 cmd_diff(int argc, char *argv[])
5531 {
5532 	const struct got_error *error = NULL;
5533 	struct got_repository *repo = NULL;
5534 	struct got_worktree *worktree = NULL;
5535 	struct got_object_id *id1 = NULL, *id2 = NULL;
5536 	char *repo_path = NULL, *cwd = NULL;
5537 	char *id_str1 = NULL, *id_str2 = NULL;
5538 	char *label1 = NULL, *label2 = NULL;
5539 	int diff_context = 3, ignore_whitespace = 0;
5540 	int ch, force_text_diff = 0;
5541 	const char *errstr;
5542 	struct tog_view *view;
5543 	int *pack_fds = NULL;
5544 
5545 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5546 		switch (ch) {
5547 		case 'a':
5548 			force_text_diff = 1;
5549 			break;
5550 		case 'C':
5551 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5552 			    &errstr);
5553 			if (errstr != NULL)
5554 				errx(1, "number of context lines is %s: %s",
5555 				    errstr, errstr);
5556 			break;
5557 		case 'r':
5558 			repo_path = realpath(optarg, NULL);
5559 			if (repo_path == NULL)
5560 				return got_error_from_errno2("realpath",
5561 				    optarg);
5562 			got_path_strip_trailing_slashes(repo_path);
5563 			break;
5564 		case 'w':
5565 			ignore_whitespace = 1;
5566 			break;
5567 		default:
5568 			usage_diff();
5569 			/* NOTREACHED */
5570 		}
5571 	}
5572 
5573 	argc -= optind;
5574 	argv += optind;
5575 
5576 	if (argc == 0) {
5577 		usage_diff(); /* TODO show local worktree changes */
5578 	} else if (argc == 2) {
5579 		id_str1 = argv[0];
5580 		id_str2 = argv[1];
5581 	} else
5582 		usage_diff();
5583 
5584 	error = got_repo_pack_fds_open(&pack_fds);
5585 	if (error)
5586 		goto done;
5587 
5588 	if (repo_path == NULL) {
5589 		cwd = getcwd(NULL, 0);
5590 		if (cwd == NULL)
5591 			return got_error_from_errno("getcwd");
5592 		error = got_worktree_open(&worktree, cwd);
5593 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5594 			goto done;
5595 		if (worktree)
5596 			repo_path =
5597 			    strdup(got_worktree_get_repo_path(worktree));
5598 		else
5599 			repo_path = strdup(cwd);
5600 		if (repo_path == NULL) {
5601 			error = got_error_from_errno("strdup");
5602 			goto done;
5603 		}
5604 	}
5605 
5606 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5607 	if (error)
5608 		goto done;
5609 
5610 	init_curses();
5611 
5612 	error = apply_unveil(got_repo_get_path(repo), NULL);
5613 	if (error)
5614 		goto done;
5615 
5616 	error = tog_load_refs(repo, 0);
5617 	if (error)
5618 		goto done;
5619 
5620 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5621 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5622 	if (error)
5623 		goto done;
5624 
5625 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5626 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5627 	if (error)
5628 		goto done;
5629 
5630 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5631 	if (view == NULL) {
5632 		error = got_error_from_errno("view_open");
5633 		goto done;
5634 	}
5635 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5636 	    ignore_whitespace, force_text_diff, NULL,  repo);
5637 	if (error)
5638 		goto done;
5639 	error = view_loop(view);
5640 done:
5641 	free(label1);
5642 	free(label2);
5643 	free(repo_path);
5644 	free(cwd);
5645 	if (repo) {
5646 		const struct got_error *close_err = got_repo_close(repo);
5647 		if (error == NULL)
5648 			error = close_err;
5649 	}
5650 	if (worktree)
5651 		got_worktree_close(worktree);
5652 	if (pack_fds) {
5653 		const struct got_error *pack_err =
5654 		    got_repo_pack_fds_close(pack_fds);
5655 		if (error == NULL)
5656 			error = pack_err;
5657 	}
5658 	tog_free_refs();
5659 	return error;
5660 }
5661 
5662 __dead static void
5663 usage_blame(void)
5664 {
5665 	endwin();
5666 	fprintf(stderr,
5667 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5668 	    getprogname());
5669 	exit(1);
5670 }
5671 
5672 struct tog_blame_line {
5673 	int annotated;
5674 	struct got_object_id *id;
5675 };
5676 
5677 static const struct got_error *
5678 draw_blame(struct tog_view *view)
5679 {
5680 	struct tog_blame_view_state *s = &view->state.blame;
5681 	struct tog_blame *blame = &s->blame;
5682 	regmatch_t *regmatch = &view->regmatch;
5683 	const struct got_error *err;
5684 	int lineno = 0, nprinted = 0;
5685 	char *line = NULL;
5686 	size_t linesize = 0;
5687 	ssize_t linelen;
5688 	wchar_t *wline;
5689 	int width;
5690 	struct tog_blame_line *blame_line;
5691 	struct got_object_id *prev_id = NULL;
5692 	char *id_str;
5693 	struct tog_color *tc;
5694 
5695 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5696 	if (err)
5697 		return err;
5698 
5699 	rewind(blame->f);
5700 	werase(view->window);
5701 
5702 	if (asprintf(&line, "commit %s", id_str) == -1) {
5703 		err = got_error_from_errno("asprintf");
5704 		free(id_str);
5705 		return err;
5706 	}
5707 
5708 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5709 	free(line);
5710 	line = NULL;
5711 	if (err)
5712 		return err;
5713 	if (view_needs_focus_indication(view))
5714 		wstandout(view->window);
5715 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5716 	if (tc)
5717 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5718 	waddwstr(view->window, wline);
5719 	while (width++ < view->ncols)
5720 		waddch(view->window, ' ');
5721 	if (tc)
5722 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5723 	if (view_needs_focus_indication(view))
5724 		wstandend(view->window);
5725 	free(wline);
5726 	wline = NULL;
5727 
5728 	if (view->gline > blame->nlines)
5729 		view->gline = blame->nlines;
5730 
5731 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5732 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5733 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5734 		free(id_str);
5735 		return got_error_from_errno("asprintf");
5736 	}
5737 	free(id_str);
5738 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5739 	free(line);
5740 	line = NULL;
5741 	if (err)
5742 		return err;
5743 	waddwstr(view->window, wline);
5744 	free(wline);
5745 	wline = NULL;
5746 	if (width < view->ncols - 1)
5747 		waddch(view->window, '\n');
5748 
5749 	s->eof = 0;
5750 	view->maxx = 0;
5751 	while (nprinted < view->nlines - 2) {
5752 		linelen = getline(&line, &linesize, blame->f);
5753 		if (linelen == -1) {
5754 			if (feof(blame->f)) {
5755 				s->eof = 1;
5756 				break;
5757 			}
5758 			free(line);
5759 			return got_ferror(blame->f, GOT_ERR_IO);
5760 		}
5761 		if (++lineno < s->first_displayed_line)
5762 			continue;
5763 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5764 			continue;
5765 
5766 		/* Set view->maxx based on full line length. */
5767 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5768 		if (err) {
5769 			free(line);
5770 			return err;
5771 		}
5772 		free(wline);
5773 		wline = NULL;
5774 		view->maxx = MAX(view->maxx, width);
5775 
5776 		if (nprinted == s->selected_line - 1)
5777 			wstandout(view->window);
5778 
5779 		if (blame->nlines > 0) {
5780 			blame_line = &blame->lines[lineno - 1];
5781 			if (blame_line->annotated && prev_id &&
5782 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5783 			    !(nprinted == s->selected_line - 1)) {
5784 				waddstr(view->window, "        ");
5785 			} else if (blame_line->annotated) {
5786 				char *id_str;
5787 				err = got_object_id_str(&id_str,
5788 				    blame_line->id);
5789 				if (err) {
5790 					free(line);
5791 					return err;
5792 				}
5793 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5794 				if (tc)
5795 					wattr_on(view->window,
5796 					    COLOR_PAIR(tc->colorpair), NULL);
5797 				wprintw(view->window, "%.8s", id_str);
5798 				if (tc)
5799 					wattr_off(view->window,
5800 					    COLOR_PAIR(tc->colorpair), NULL);
5801 				free(id_str);
5802 				prev_id = blame_line->id;
5803 			} else {
5804 				waddstr(view->window, "........");
5805 				prev_id = NULL;
5806 			}
5807 		} else {
5808 			waddstr(view->window, "........");
5809 			prev_id = NULL;
5810 		}
5811 
5812 		if (nprinted == s->selected_line - 1)
5813 			wstandend(view->window);
5814 		waddstr(view->window, " ");
5815 
5816 		if (view->ncols <= 9) {
5817 			width = 9;
5818 		} else if (s->first_displayed_line + nprinted ==
5819 		    s->matched_line &&
5820 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5821 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5822 			    view->window, view->x, regmatch);
5823 			if (err) {
5824 				free(line);
5825 				return err;
5826 			}
5827 			width += 9;
5828 		} else {
5829 			int skip;
5830 			err = format_line(&wline, &width, &skip, line,
5831 			    view->x, view->ncols - 9, 9, 1);
5832 			if (err) {
5833 				free(line);
5834 				return err;
5835 			}
5836 			waddwstr(view->window, &wline[skip]);
5837 			width += 9;
5838 			free(wline);
5839 			wline = NULL;
5840 		}
5841 
5842 		if (width <= view->ncols - 1)
5843 			waddch(view->window, '\n');
5844 		if (++nprinted == 1)
5845 			s->first_displayed_line = lineno;
5846 	}
5847 	free(line);
5848 	s->last_displayed_line = lineno;
5849 
5850 	view_border(view);
5851 
5852 	return NULL;
5853 }
5854 
5855 static const struct got_error *
5856 blame_cb(void *arg, int nlines, int lineno,
5857     struct got_commit_object *commit, struct got_object_id *id)
5858 {
5859 	const struct got_error *err = NULL;
5860 	struct tog_blame_cb_args *a = arg;
5861 	struct tog_blame_line *line;
5862 	int errcode;
5863 
5864 	if (nlines != a->nlines ||
5865 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5866 		return got_error(GOT_ERR_RANGE);
5867 
5868 	errcode = pthread_mutex_lock(&tog_mutex);
5869 	if (errcode)
5870 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5871 
5872 	if (*a->quit) {	/* user has quit the blame view */
5873 		err = got_error(GOT_ERR_ITER_COMPLETED);
5874 		goto done;
5875 	}
5876 
5877 	if (lineno == -1)
5878 		goto done; /* no change in this commit */
5879 
5880 	line = &a->lines[lineno - 1];
5881 	if (line->annotated)
5882 		goto done;
5883 
5884 	line->id = got_object_id_dup(id);
5885 	if (line->id == NULL) {
5886 		err = got_error_from_errno("got_object_id_dup");
5887 		goto done;
5888 	}
5889 	line->annotated = 1;
5890 done:
5891 	errcode = pthread_mutex_unlock(&tog_mutex);
5892 	if (errcode)
5893 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5894 	return err;
5895 }
5896 
5897 static void *
5898 blame_thread(void *arg)
5899 {
5900 	const struct got_error *err, *close_err;
5901 	struct tog_blame_thread_args *ta = arg;
5902 	struct tog_blame_cb_args *a = ta->cb_args;
5903 	int errcode, fd1 = -1, fd2 = -1;
5904 	FILE *f1 = NULL, *f2 = NULL;
5905 
5906 	fd1 = got_opentempfd();
5907 	if (fd1 == -1)
5908 		return (void *)got_error_from_errno("got_opentempfd");
5909 
5910 	fd2 = got_opentempfd();
5911 	if (fd2 == -1) {
5912 		err = got_error_from_errno("got_opentempfd");
5913 		goto done;
5914 	}
5915 
5916 	f1 = got_opentemp();
5917 	if (f1 == NULL) {
5918 		err = (void *)got_error_from_errno("got_opentemp");
5919 		goto done;
5920 	}
5921 	f2 = got_opentemp();
5922 	if (f2 == NULL) {
5923 		err = (void *)got_error_from_errno("got_opentemp");
5924 		goto done;
5925 	}
5926 
5927 	err = block_signals_used_by_main_thread();
5928 	if (err)
5929 		goto done;
5930 
5931 	err = got_blame(ta->path, a->commit_id, ta->repo,
5932 	    tog_diff_algo, blame_cb, ta->cb_args,
5933 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5934 	if (err && err->code == GOT_ERR_CANCELLED)
5935 		err = NULL;
5936 
5937 	errcode = pthread_mutex_lock(&tog_mutex);
5938 	if (errcode) {
5939 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5940 		goto done;
5941 	}
5942 
5943 	close_err = got_repo_close(ta->repo);
5944 	if (err == NULL)
5945 		err = close_err;
5946 	ta->repo = NULL;
5947 	*ta->complete = 1;
5948 
5949 	errcode = pthread_mutex_unlock(&tog_mutex);
5950 	if (errcode && err == NULL)
5951 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5952 
5953 done:
5954 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5955 		err = got_error_from_errno("close");
5956 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5957 		err = got_error_from_errno("close");
5958 	if (f1 && fclose(f1) == EOF && err == NULL)
5959 		err = got_error_from_errno("fclose");
5960 	if (f2 && fclose(f2) == EOF && err == NULL)
5961 		err = got_error_from_errno("fclose");
5962 
5963 	return (void *)err;
5964 }
5965 
5966 static struct got_object_id *
5967 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5968     int first_displayed_line, int selected_line)
5969 {
5970 	struct tog_blame_line *line;
5971 
5972 	if (nlines <= 0)
5973 		return NULL;
5974 
5975 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5976 	if (!line->annotated)
5977 		return NULL;
5978 
5979 	return line->id;
5980 }
5981 
5982 static struct got_object_id *
5983 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5984     int lineno)
5985 {
5986 	struct tog_blame_line *line;
5987 
5988 	if (nlines <= 0 || lineno >= nlines)
5989 		return NULL;
5990 
5991 	line = &lines[lineno - 1];
5992 	if (!line->annotated)
5993 		return NULL;
5994 
5995 	return line->id;
5996 }
5997 
5998 static const struct got_error *
5999 stop_blame(struct tog_blame *blame)
6000 {
6001 	const struct got_error *err = NULL;
6002 	int i;
6003 
6004 	if (blame->thread) {
6005 		int errcode;
6006 		errcode = pthread_mutex_unlock(&tog_mutex);
6007 		if (errcode)
6008 			return got_error_set_errno(errcode,
6009 			    "pthread_mutex_unlock");
6010 		errcode = pthread_join(blame->thread, (void **)&err);
6011 		if (errcode)
6012 			return got_error_set_errno(errcode, "pthread_join");
6013 		errcode = pthread_mutex_lock(&tog_mutex);
6014 		if (errcode)
6015 			return got_error_set_errno(errcode,
6016 			    "pthread_mutex_lock");
6017 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6018 			err = NULL;
6019 		blame->thread = 0; //NULL;
6020 	}
6021 	if (blame->thread_args.repo) {
6022 		const struct got_error *close_err;
6023 		close_err = got_repo_close(blame->thread_args.repo);
6024 		if (err == NULL)
6025 			err = close_err;
6026 		blame->thread_args.repo = NULL;
6027 	}
6028 	if (blame->f) {
6029 		if (fclose(blame->f) == EOF && err == NULL)
6030 			err = got_error_from_errno("fclose");
6031 		blame->f = NULL;
6032 	}
6033 	if (blame->lines) {
6034 		for (i = 0; i < blame->nlines; i++)
6035 			free(blame->lines[i].id);
6036 		free(blame->lines);
6037 		blame->lines = NULL;
6038 	}
6039 	free(blame->cb_args.commit_id);
6040 	blame->cb_args.commit_id = NULL;
6041 	if (blame->pack_fds) {
6042 		const struct got_error *pack_err =
6043 		    got_repo_pack_fds_close(blame->pack_fds);
6044 		if (err == NULL)
6045 			err = pack_err;
6046 		blame->pack_fds = NULL;
6047 	}
6048 	return err;
6049 }
6050 
6051 static const struct got_error *
6052 cancel_blame_view(void *arg)
6053 {
6054 	const struct got_error *err = NULL;
6055 	int *done = arg;
6056 	int errcode;
6057 
6058 	errcode = pthread_mutex_lock(&tog_mutex);
6059 	if (errcode)
6060 		return got_error_set_errno(errcode,
6061 		    "pthread_mutex_unlock");
6062 
6063 	if (*done)
6064 		err = got_error(GOT_ERR_CANCELLED);
6065 
6066 	errcode = pthread_mutex_unlock(&tog_mutex);
6067 	if (errcode)
6068 		return got_error_set_errno(errcode,
6069 		    "pthread_mutex_lock");
6070 
6071 	return err;
6072 }
6073 
6074 static const struct got_error *
6075 run_blame(struct tog_view *view)
6076 {
6077 	struct tog_blame_view_state *s = &view->state.blame;
6078 	struct tog_blame *blame = &s->blame;
6079 	const struct got_error *err = NULL;
6080 	struct got_commit_object *commit = NULL;
6081 	struct got_blob_object *blob = NULL;
6082 	struct got_repository *thread_repo = NULL;
6083 	struct got_object_id *obj_id = NULL;
6084 	int obj_type, fd = -1;
6085 	int *pack_fds = NULL;
6086 
6087 	err = got_object_open_as_commit(&commit, s->repo,
6088 	    &s->blamed_commit->id);
6089 	if (err)
6090 		return err;
6091 
6092 	fd = got_opentempfd();
6093 	if (fd == -1) {
6094 		err = got_error_from_errno("got_opentempfd");
6095 		goto done;
6096 	}
6097 
6098 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6099 	if (err)
6100 		goto done;
6101 
6102 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6103 	if (err)
6104 		goto done;
6105 
6106 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6107 		err = got_error(GOT_ERR_OBJ_TYPE);
6108 		goto done;
6109 	}
6110 
6111 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6112 	if (err)
6113 		goto done;
6114 	blame->f = got_opentemp();
6115 	if (blame->f == NULL) {
6116 		err = got_error_from_errno("got_opentemp");
6117 		goto done;
6118 	}
6119 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6120 	    &blame->line_offsets, blame->f, blob);
6121 	if (err)
6122 		goto done;
6123 	if (blame->nlines == 0) {
6124 		s->blame_complete = 1;
6125 		goto done;
6126 	}
6127 
6128 	/* Don't include \n at EOF in the blame line count. */
6129 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6130 		blame->nlines--;
6131 
6132 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6133 	if (blame->lines == NULL) {
6134 		err = got_error_from_errno("calloc");
6135 		goto done;
6136 	}
6137 
6138 	err = got_repo_pack_fds_open(&pack_fds);
6139 	if (err)
6140 		goto done;
6141 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6142 	    pack_fds);
6143 	if (err)
6144 		goto done;
6145 
6146 	blame->pack_fds = pack_fds;
6147 	blame->cb_args.view = view;
6148 	blame->cb_args.lines = blame->lines;
6149 	blame->cb_args.nlines = blame->nlines;
6150 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6151 	if (blame->cb_args.commit_id == NULL) {
6152 		err = got_error_from_errno("got_object_id_dup");
6153 		goto done;
6154 	}
6155 	blame->cb_args.quit = &s->done;
6156 
6157 	blame->thread_args.path = s->path;
6158 	blame->thread_args.repo = thread_repo;
6159 	blame->thread_args.cb_args = &blame->cb_args;
6160 	blame->thread_args.complete = &s->blame_complete;
6161 	blame->thread_args.cancel_cb = cancel_blame_view;
6162 	blame->thread_args.cancel_arg = &s->done;
6163 	s->blame_complete = 0;
6164 
6165 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6166 		s->first_displayed_line = 1;
6167 		s->last_displayed_line = view->nlines;
6168 		s->selected_line = 1;
6169 	}
6170 	s->matched_line = 0;
6171 
6172 done:
6173 	if (commit)
6174 		got_object_commit_close(commit);
6175 	if (fd != -1 && close(fd) == -1 && err == NULL)
6176 		err = got_error_from_errno("close");
6177 	if (blob)
6178 		got_object_blob_close(blob);
6179 	free(obj_id);
6180 	if (err)
6181 		stop_blame(blame);
6182 	return err;
6183 }
6184 
6185 static const struct got_error *
6186 open_blame_view(struct tog_view *view, char *path,
6187     struct got_object_id *commit_id, struct got_repository *repo)
6188 {
6189 	const struct got_error *err = NULL;
6190 	struct tog_blame_view_state *s = &view->state.blame;
6191 
6192 	STAILQ_INIT(&s->blamed_commits);
6193 
6194 	s->path = strdup(path);
6195 	if (s->path == NULL)
6196 		return got_error_from_errno("strdup");
6197 
6198 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6199 	if (err) {
6200 		free(s->path);
6201 		return err;
6202 	}
6203 
6204 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6205 	s->first_displayed_line = 1;
6206 	s->last_displayed_line = view->nlines;
6207 	s->selected_line = 1;
6208 	s->blame_complete = 0;
6209 	s->repo = repo;
6210 	s->commit_id = commit_id;
6211 	memset(&s->blame, 0, sizeof(s->blame));
6212 
6213 	STAILQ_INIT(&s->colors);
6214 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6215 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6216 		    get_color_value("TOG_COLOR_COMMIT"));
6217 		if (err)
6218 			return err;
6219 	}
6220 
6221 	view->show = show_blame_view;
6222 	view->input = input_blame_view;
6223 	view->reset = reset_blame_view;
6224 	view->close = close_blame_view;
6225 	view->search_start = search_start_blame_view;
6226 	view->search_setup = search_setup_blame_view;
6227 	view->search_next = search_next_view_match;
6228 
6229 	return run_blame(view);
6230 }
6231 
6232 static const struct got_error *
6233 close_blame_view(struct tog_view *view)
6234 {
6235 	const struct got_error *err = NULL;
6236 	struct tog_blame_view_state *s = &view->state.blame;
6237 
6238 	if (s->blame.thread)
6239 		err = stop_blame(&s->blame);
6240 
6241 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6242 		struct got_object_qid *blamed_commit;
6243 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6244 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6245 		got_object_qid_free(blamed_commit);
6246 	}
6247 
6248 	free(s->path);
6249 	free_colors(&s->colors);
6250 	return err;
6251 }
6252 
6253 static const struct got_error *
6254 search_start_blame_view(struct tog_view *view)
6255 {
6256 	struct tog_blame_view_state *s = &view->state.blame;
6257 
6258 	s->matched_line = 0;
6259 	return NULL;
6260 }
6261 
6262 static void
6263 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6264     size_t *nlines, int **first, int **last, int **match, int **selected)
6265 {
6266 	struct tog_blame_view_state *s = &view->state.blame;
6267 
6268 	*f = s->blame.f;
6269 	*nlines = s->blame.nlines;
6270 	*line_offsets = s->blame.line_offsets;
6271 	*match = &s->matched_line;
6272 	*first = &s->first_displayed_line;
6273 	*last = &s->last_displayed_line;
6274 	*selected = &s->selected_line;
6275 }
6276 
6277 static const struct got_error *
6278 show_blame_view(struct tog_view *view)
6279 {
6280 	const struct got_error *err = NULL;
6281 	struct tog_blame_view_state *s = &view->state.blame;
6282 	int errcode;
6283 
6284 	if (s->blame.thread == 0 && !s->blame_complete) {
6285 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6286 		    &s->blame.thread_args);
6287 		if (errcode)
6288 			return got_error_set_errno(errcode, "pthread_create");
6289 
6290 		halfdelay(1); /* fast refresh while annotating  */
6291 	}
6292 
6293 	if (s->blame_complete)
6294 		halfdelay(10); /* disable fast refresh */
6295 
6296 	err = draw_blame(view);
6297 
6298 	view_border(view);
6299 	return err;
6300 }
6301 
6302 static const struct got_error *
6303 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6304     struct got_repository *repo, struct got_object_id *id)
6305 {
6306 	struct tog_view		*log_view;
6307 	const struct got_error	*err = NULL;
6308 
6309 	*new_view = NULL;
6310 
6311 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6312 	if (log_view == NULL)
6313 		return got_error_from_errno("view_open");
6314 
6315 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6316 	if (err)
6317 		view_close(log_view);
6318 	else
6319 		*new_view = log_view;
6320 
6321 	return err;
6322 }
6323 
6324 static const struct got_error *
6325 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6326 {
6327 	const struct got_error *err = NULL, *thread_err = NULL;
6328 	struct tog_view *diff_view;
6329 	struct tog_blame_view_state *s = &view->state.blame;
6330 	int eos, nscroll, begin_y = 0, begin_x = 0;
6331 
6332 	eos = nscroll = view->nlines - 2;
6333 	if (view_is_hsplit_top(view))
6334 		--eos;  /* border */
6335 
6336 	switch (ch) {
6337 	case '0':
6338 	case '$':
6339 	case KEY_RIGHT:
6340 	case 'l':
6341 	case KEY_LEFT:
6342 	case 'h':
6343 		horizontal_scroll_input(view, ch);
6344 		break;
6345 	case 'q':
6346 		s->done = 1;
6347 		break;
6348 	case 'g':
6349 	case KEY_HOME:
6350 		s->selected_line = 1;
6351 		s->first_displayed_line = 1;
6352 		view->count = 0;
6353 		break;
6354 	case 'G':
6355 	case KEY_END:
6356 		if (s->blame.nlines < eos) {
6357 			s->selected_line = s->blame.nlines;
6358 			s->first_displayed_line = 1;
6359 		} else {
6360 			s->selected_line = eos;
6361 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6362 		}
6363 		view->count = 0;
6364 		break;
6365 	case 'k':
6366 	case KEY_UP:
6367 	case CTRL('p'):
6368 		if (s->selected_line > 1)
6369 			s->selected_line--;
6370 		else if (s->selected_line == 1 &&
6371 		    s->first_displayed_line > 1)
6372 			s->first_displayed_line--;
6373 		else
6374 			view->count = 0;
6375 		break;
6376 	case CTRL('u'):
6377 	case 'u':
6378 		nscroll /= 2;
6379 		/* FALL THROUGH */
6380 	case KEY_PPAGE:
6381 	case CTRL('b'):
6382 	case 'b':
6383 		if (s->first_displayed_line == 1) {
6384 			if (view->count > 1)
6385 				nscroll += nscroll;
6386 			s->selected_line = MAX(1, s->selected_line - nscroll);
6387 			view->count = 0;
6388 			break;
6389 		}
6390 		if (s->first_displayed_line > nscroll)
6391 			s->first_displayed_line -= nscroll;
6392 		else
6393 			s->first_displayed_line = 1;
6394 		break;
6395 	case 'j':
6396 	case KEY_DOWN:
6397 	case CTRL('n'):
6398 		if (s->selected_line < eos && s->first_displayed_line +
6399 		    s->selected_line <= s->blame.nlines)
6400 			s->selected_line++;
6401 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6402 			s->first_displayed_line++;
6403 		else
6404 			view->count = 0;
6405 		break;
6406 	case 'c':
6407 	case 'p': {
6408 		struct got_object_id *id = NULL;
6409 
6410 		view->count = 0;
6411 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6412 		    s->first_displayed_line, s->selected_line);
6413 		if (id == NULL)
6414 			break;
6415 		if (ch == 'p') {
6416 			struct got_commit_object *commit, *pcommit;
6417 			struct got_object_qid *pid;
6418 			struct got_object_id *blob_id = NULL;
6419 			int obj_type;
6420 			err = got_object_open_as_commit(&commit,
6421 			    s->repo, id);
6422 			if (err)
6423 				break;
6424 			pid = STAILQ_FIRST(
6425 			    got_object_commit_get_parent_ids(commit));
6426 			if (pid == NULL) {
6427 				got_object_commit_close(commit);
6428 				break;
6429 			}
6430 			/* Check if path history ends here. */
6431 			err = got_object_open_as_commit(&pcommit,
6432 			    s->repo, &pid->id);
6433 			if (err)
6434 				break;
6435 			err = got_object_id_by_path(&blob_id, s->repo,
6436 			    pcommit, s->path);
6437 			got_object_commit_close(pcommit);
6438 			if (err) {
6439 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6440 					err = NULL;
6441 				got_object_commit_close(commit);
6442 				break;
6443 			}
6444 			err = got_object_get_type(&obj_type, s->repo,
6445 			    blob_id);
6446 			free(blob_id);
6447 			/* Can't blame non-blob type objects. */
6448 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6449 				got_object_commit_close(commit);
6450 				break;
6451 			}
6452 			err = got_object_qid_alloc(&s->blamed_commit,
6453 			    &pid->id);
6454 			got_object_commit_close(commit);
6455 		} else {
6456 			if (got_object_id_cmp(id,
6457 			    &s->blamed_commit->id) == 0)
6458 				break;
6459 			err = got_object_qid_alloc(&s->blamed_commit,
6460 			    id);
6461 		}
6462 		if (err)
6463 			break;
6464 		s->done = 1;
6465 		thread_err = stop_blame(&s->blame);
6466 		s->done = 0;
6467 		if (thread_err)
6468 			break;
6469 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6470 		    s->blamed_commit, entry);
6471 		err = run_blame(view);
6472 		if (err)
6473 			break;
6474 		break;
6475 	}
6476 	case 'C': {
6477 		struct got_object_qid *first;
6478 
6479 		view->count = 0;
6480 		first = STAILQ_FIRST(&s->blamed_commits);
6481 		if (!got_object_id_cmp(&first->id, s->commit_id))
6482 			break;
6483 		s->done = 1;
6484 		thread_err = stop_blame(&s->blame);
6485 		s->done = 0;
6486 		if (thread_err)
6487 			break;
6488 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6489 		got_object_qid_free(s->blamed_commit);
6490 		s->blamed_commit =
6491 		    STAILQ_FIRST(&s->blamed_commits);
6492 		err = run_blame(view);
6493 		if (err)
6494 			break;
6495 		break;
6496 	}
6497 	case 'L':
6498 		view->count = 0;
6499 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6500 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6501 		if (s->id_to_log)
6502 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6503 		break;
6504 	case KEY_ENTER:
6505 	case '\r': {
6506 		struct got_object_id *id = NULL;
6507 		struct got_object_qid *pid;
6508 		struct got_commit_object *commit = NULL;
6509 
6510 		view->count = 0;
6511 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6512 		    s->first_displayed_line, s->selected_line);
6513 		if (id == NULL)
6514 			break;
6515 		err = got_object_open_as_commit(&commit, s->repo, id);
6516 		if (err)
6517 			break;
6518 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6519 		if (*new_view) {
6520 			/* traversed from diff view, release diff resources  */
6521 			err = close_diff_view(*new_view);
6522 			if (err)
6523 				break;
6524 			diff_view = *new_view;
6525 		} else {
6526 			if (view_is_parent_view(view))
6527 				view_get_split(view, &begin_y, &begin_x);
6528 
6529 			diff_view = view_open(0, 0, begin_y, begin_x,
6530 			    TOG_VIEW_DIFF);
6531 			if (diff_view == NULL) {
6532 				got_object_commit_close(commit);
6533 				err = got_error_from_errno("view_open");
6534 				break;
6535 			}
6536 		}
6537 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6538 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6539 		got_object_commit_close(commit);
6540 		if (err) {
6541 			view_close(diff_view);
6542 			break;
6543 		}
6544 		s->last_diffed_line = s->first_displayed_line - 1 +
6545 		    s->selected_line;
6546 		if (*new_view)
6547 			break;	/* still open from active diff view */
6548 		if (view_is_parent_view(view) &&
6549 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6550 			err = view_init_hsplit(view, begin_y);
6551 			if (err)
6552 				break;
6553 		}
6554 
6555 		view->focussed = 0;
6556 		diff_view->focussed = 1;
6557 		diff_view->mode = view->mode;
6558 		diff_view->nlines = view->lines - begin_y;
6559 		if (view_is_parent_view(view)) {
6560 			view_transfer_size(diff_view, view);
6561 			err = view_close_child(view);
6562 			if (err)
6563 				break;
6564 			err = view_set_child(view, diff_view);
6565 			if (err)
6566 				break;
6567 			view->focus_child = 1;
6568 		} else
6569 			*new_view = diff_view;
6570 		if (err)
6571 			break;
6572 		break;
6573 	}
6574 	case CTRL('d'):
6575 	case 'd':
6576 		nscroll /= 2;
6577 		/* FALL THROUGH */
6578 	case KEY_NPAGE:
6579 	case CTRL('f'):
6580 	case 'f':
6581 	case ' ':
6582 		if (s->last_displayed_line >= s->blame.nlines &&
6583 		    s->selected_line >= MIN(s->blame.nlines,
6584 		    view->nlines - 2)) {
6585 			view->count = 0;
6586 			break;
6587 		}
6588 		if (s->last_displayed_line >= s->blame.nlines &&
6589 		    s->selected_line < view->nlines - 2) {
6590 			s->selected_line +=
6591 			    MIN(nscroll, s->last_displayed_line -
6592 			    s->first_displayed_line - s->selected_line + 1);
6593 		}
6594 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6595 			s->first_displayed_line += nscroll;
6596 		else
6597 			s->first_displayed_line =
6598 			    s->blame.nlines - (view->nlines - 3);
6599 		break;
6600 	case KEY_RESIZE:
6601 		if (s->selected_line > view->nlines - 2) {
6602 			s->selected_line = MIN(s->blame.nlines,
6603 			    view->nlines - 2);
6604 		}
6605 		break;
6606 	default:
6607 		view->count = 0;
6608 		break;
6609 	}
6610 	return thread_err ? thread_err : err;
6611 }
6612 
6613 static const struct got_error *
6614 reset_blame_view(struct tog_view *view)
6615 {
6616 	const struct got_error *err;
6617 	struct tog_blame_view_state *s = &view->state.blame;
6618 
6619 	view->count = 0;
6620 	s->done = 1;
6621 	err = stop_blame(&s->blame);
6622 	s->done = 0;
6623 	if (err)
6624 		return err;
6625 	return run_blame(view);
6626 }
6627 
6628 static const struct got_error *
6629 cmd_blame(int argc, char *argv[])
6630 {
6631 	const struct got_error *error;
6632 	struct got_repository *repo = NULL;
6633 	struct got_worktree *worktree = NULL;
6634 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6635 	char *link_target = NULL;
6636 	struct got_object_id *commit_id = NULL;
6637 	struct got_commit_object *commit = NULL;
6638 	char *commit_id_str = NULL;
6639 	int ch;
6640 	struct tog_view *view;
6641 	int *pack_fds = NULL;
6642 
6643 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6644 		switch (ch) {
6645 		case 'c':
6646 			commit_id_str = optarg;
6647 			break;
6648 		case 'r':
6649 			repo_path = realpath(optarg, NULL);
6650 			if (repo_path == NULL)
6651 				return got_error_from_errno2("realpath",
6652 				    optarg);
6653 			break;
6654 		default:
6655 			usage_blame();
6656 			/* NOTREACHED */
6657 		}
6658 	}
6659 
6660 	argc -= optind;
6661 	argv += optind;
6662 
6663 	if (argc != 1)
6664 		usage_blame();
6665 
6666 	error = got_repo_pack_fds_open(&pack_fds);
6667 	if (error != NULL)
6668 		goto done;
6669 
6670 	if (repo_path == NULL) {
6671 		cwd = getcwd(NULL, 0);
6672 		if (cwd == NULL)
6673 			return got_error_from_errno("getcwd");
6674 		error = got_worktree_open(&worktree, cwd);
6675 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6676 			goto done;
6677 		if (worktree)
6678 			repo_path =
6679 			    strdup(got_worktree_get_repo_path(worktree));
6680 		else
6681 			repo_path = strdup(cwd);
6682 		if (repo_path == NULL) {
6683 			error = got_error_from_errno("strdup");
6684 			goto done;
6685 		}
6686 	}
6687 
6688 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6689 	if (error != NULL)
6690 		goto done;
6691 
6692 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6693 	    worktree);
6694 	if (error)
6695 		goto done;
6696 
6697 	init_curses();
6698 
6699 	error = apply_unveil(got_repo_get_path(repo), NULL);
6700 	if (error)
6701 		goto done;
6702 
6703 	error = tog_load_refs(repo, 0);
6704 	if (error)
6705 		goto done;
6706 
6707 	if (commit_id_str == NULL) {
6708 		struct got_reference *head_ref;
6709 		error = got_ref_open(&head_ref, repo, worktree ?
6710 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6711 		if (error != NULL)
6712 			goto done;
6713 		error = got_ref_resolve(&commit_id, repo, head_ref);
6714 		got_ref_close(head_ref);
6715 	} else {
6716 		error = got_repo_match_object_id(&commit_id, NULL,
6717 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6718 	}
6719 	if (error != NULL)
6720 		goto done;
6721 
6722 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6723 	if (view == NULL) {
6724 		error = got_error_from_errno("view_open");
6725 		goto done;
6726 	}
6727 
6728 	error = got_object_open_as_commit(&commit, repo, commit_id);
6729 	if (error)
6730 		goto done;
6731 
6732 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6733 	    commit, repo);
6734 	if (error)
6735 		goto done;
6736 
6737 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6738 	    commit_id, repo);
6739 	if (error)
6740 		goto done;
6741 	if (worktree) {
6742 		/* Release work tree lock. */
6743 		got_worktree_close(worktree);
6744 		worktree = NULL;
6745 	}
6746 	error = view_loop(view);
6747 done:
6748 	free(repo_path);
6749 	free(in_repo_path);
6750 	free(link_target);
6751 	free(cwd);
6752 	free(commit_id);
6753 	if (commit)
6754 		got_object_commit_close(commit);
6755 	if (worktree)
6756 		got_worktree_close(worktree);
6757 	if (repo) {
6758 		const struct got_error *close_err = got_repo_close(repo);
6759 		if (error == NULL)
6760 			error = close_err;
6761 	}
6762 	if (pack_fds) {
6763 		const struct got_error *pack_err =
6764 		    got_repo_pack_fds_close(pack_fds);
6765 		if (error == NULL)
6766 			error = pack_err;
6767 	}
6768 	tog_free_refs();
6769 	return error;
6770 }
6771 
6772 static const struct got_error *
6773 draw_tree_entries(struct tog_view *view, const char *parent_path)
6774 {
6775 	struct tog_tree_view_state *s = &view->state.tree;
6776 	const struct got_error *err = NULL;
6777 	struct got_tree_entry *te;
6778 	wchar_t *wline;
6779 	char *index = NULL;
6780 	struct tog_color *tc;
6781 	int width, n, nentries, scrollx, i = 1;
6782 	int limit = view->nlines;
6783 
6784 	s->ndisplayed = 0;
6785 	if (view_is_hsplit_top(view))
6786 		--limit;  /* border */
6787 
6788 	werase(view->window);
6789 
6790 	if (limit == 0)
6791 		return NULL;
6792 
6793 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6794 	    0, 0);
6795 	if (err)
6796 		return err;
6797 	if (view_needs_focus_indication(view))
6798 		wstandout(view->window);
6799 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6800 	if (tc)
6801 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6802 	waddwstr(view->window, wline);
6803 	free(wline);
6804 	wline = NULL;
6805 	while (width++ < view->ncols)
6806 		waddch(view->window, ' ');
6807 	if (tc)
6808 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6809 	if (view_needs_focus_indication(view))
6810 		wstandend(view->window);
6811 	if (--limit <= 0)
6812 		return NULL;
6813 
6814 	i += s->selected;
6815 	if (s->first_displayed_entry) {
6816 		i += got_tree_entry_get_index(s->first_displayed_entry);
6817 		if (s->tree != s->root)
6818 			++i;  /* account for ".." entry */
6819 	}
6820 	nentries = got_object_tree_get_nentries(s->tree);
6821 	if (asprintf(&index, "[%d/%d] %s",
6822 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6823 		return got_error_from_errno("asprintf");
6824 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6825 	free(index);
6826 	if (err)
6827 		return err;
6828 	waddwstr(view->window, wline);
6829 	free(wline);
6830 	wline = NULL;
6831 	if (width < view->ncols - 1)
6832 		waddch(view->window, '\n');
6833 	if (--limit <= 0)
6834 		return NULL;
6835 	waddch(view->window, '\n');
6836 	if (--limit <= 0)
6837 		return NULL;
6838 
6839 	if (s->first_displayed_entry == NULL) {
6840 		te = got_object_tree_get_first_entry(s->tree);
6841 		if (s->selected == 0) {
6842 			if (view->focussed)
6843 				wstandout(view->window);
6844 			s->selected_entry = NULL;
6845 		}
6846 		waddstr(view->window, "  ..\n");	/* parent directory */
6847 		if (s->selected == 0 && view->focussed)
6848 			wstandend(view->window);
6849 		s->ndisplayed++;
6850 		if (--limit <= 0)
6851 			return NULL;
6852 		n = 1;
6853 	} else {
6854 		n = 0;
6855 		te = s->first_displayed_entry;
6856 	}
6857 
6858 	view->maxx = 0;
6859 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6860 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6861 		const char *modestr = "";
6862 		mode_t mode;
6863 
6864 		te = got_object_tree_get_entry(s->tree, i);
6865 		mode = got_tree_entry_get_mode(te);
6866 
6867 		if (s->show_ids) {
6868 			err = got_object_id_str(&id_str,
6869 			    got_tree_entry_get_id(te));
6870 			if (err)
6871 				return got_error_from_errno(
6872 				    "got_object_id_str");
6873 		}
6874 		if (got_object_tree_entry_is_submodule(te))
6875 			modestr = "$";
6876 		else if (S_ISLNK(mode)) {
6877 			int i;
6878 
6879 			err = got_tree_entry_get_symlink_target(&link_target,
6880 			    te, s->repo);
6881 			if (err) {
6882 				free(id_str);
6883 				return err;
6884 			}
6885 			for (i = 0; i < strlen(link_target); i++) {
6886 				if (!isprint((unsigned char)link_target[i]))
6887 					link_target[i] = '?';
6888 			}
6889 			modestr = "@";
6890 		}
6891 		else if (S_ISDIR(mode))
6892 			modestr = "/";
6893 		else if (mode & S_IXUSR)
6894 			modestr = "*";
6895 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6896 		    got_tree_entry_get_name(te), modestr,
6897 		    link_target ? " -> ": "",
6898 		    link_target ? link_target : "") == -1) {
6899 			free(id_str);
6900 			free(link_target);
6901 			return got_error_from_errno("asprintf");
6902 		}
6903 		free(id_str);
6904 		free(link_target);
6905 
6906 		/* use full line width to determine view->maxx */
6907 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6908 		if (err) {
6909 			free(line);
6910 			break;
6911 		}
6912 		view->maxx = MAX(view->maxx, width);
6913 		free(wline);
6914 		wline = NULL;
6915 
6916 		err = format_line(&wline, &width, &scrollx, line, view->x,
6917 		    view->ncols, 0, 0);
6918 		if (err) {
6919 			free(line);
6920 			break;
6921 		}
6922 		if (n == s->selected) {
6923 			if (view->focussed)
6924 				wstandout(view->window);
6925 			s->selected_entry = te;
6926 		}
6927 		tc = match_color(&s->colors, line);
6928 		if (tc)
6929 			wattr_on(view->window,
6930 			    COLOR_PAIR(tc->colorpair), NULL);
6931 		waddwstr(view->window, &wline[scrollx]);
6932 		if (tc)
6933 			wattr_off(view->window,
6934 			    COLOR_PAIR(tc->colorpair), NULL);
6935 		if (width < view->ncols)
6936 			waddch(view->window, '\n');
6937 		if (n == s->selected && view->focussed)
6938 			wstandend(view->window);
6939 		free(line);
6940 		free(wline);
6941 		wline = NULL;
6942 		n++;
6943 		s->ndisplayed++;
6944 		s->last_displayed_entry = te;
6945 		if (--limit <= 0)
6946 			break;
6947 	}
6948 
6949 	return err;
6950 }
6951 
6952 static void
6953 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6954 {
6955 	struct got_tree_entry *te;
6956 	int isroot = s->tree == s->root;
6957 	int i = 0;
6958 
6959 	if (s->first_displayed_entry == NULL)
6960 		return;
6961 
6962 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6963 	while (i++ < maxscroll) {
6964 		if (te == NULL) {
6965 			if (!isroot)
6966 				s->first_displayed_entry = NULL;
6967 			break;
6968 		}
6969 		s->first_displayed_entry = te;
6970 		te = got_tree_entry_get_prev(s->tree, te);
6971 	}
6972 }
6973 
6974 static const struct got_error *
6975 tree_scroll_down(struct tog_view *view, int maxscroll)
6976 {
6977 	struct tog_tree_view_state *s = &view->state.tree;
6978 	struct got_tree_entry *next, *last;
6979 	int n = 0;
6980 
6981 	if (s->first_displayed_entry)
6982 		next = got_tree_entry_get_next(s->tree,
6983 		    s->first_displayed_entry);
6984 	else
6985 		next = got_object_tree_get_first_entry(s->tree);
6986 
6987 	last = s->last_displayed_entry;
6988 	while (next && n++ < maxscroll) {
6989 		if (last) {
6990 			s->last_displayed_entry = last;
6991 			last = got_tree_entry_get_next(s->tree, last);
6992 		}
6993 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6994 			s->first_displayed_entry = next;
6995 			next = got_tree_entry_get_next(s->tree, next);
6996 		}
6997 	}
6998 
6999 	return NULL;
7000 }
7001 
7002 static const struct got_error *
7003 tree_entry_path(char **path, struct tog_parent_trees *parents,
7004     struct got_tree_entry *te)
7005 {
7006 	const struct got_error *err = NULL;
7007 	struct tog_parent_tree *pt;
7008 	size_t len = 2; /* for leading slash and NUL */
7009 
7010 	TAILQ_FOREACH(pt, parents, entry)
7011 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7012 		    + 1 /* slash */;
7013 	if (te)
7014 		len += strlen(got_tree_entry_get_name(te));
7015 
7016 	*path = calloc(1, len);
7017 	if (path == NULL)
7018 		return got_error_from_errno("calloc");
7019 
7020 	(*path)[0] = '/';
7021 	pt = TAILQ_LAST(parents, tog_parent_trees);
7022 	while (pt) {
7023 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7024 		if (strlcat(*path, name, len) >= len) {
7025 			err = got_error(GOT_ERR_NO_SPACE);
7026 			goto done;
7027 		}
7028 		if (strlcat(*path, "/", len) >= len) {
7029 			err = got_error(GOT_ERR_NO_SPACE);
7030 			goto done;
7031 		}
7032 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7033 	}
7034 	if (te) {
7035 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7036 			err = got_error(GOT_ERR_NO_SPACE);
7037 			goto done;
7038 		}
7039 	}
7040 done:
7041 	if (err) {
7042 		free(*path);
7043 		*path = NULL;
7044 	}
7045 	return err;
7046 }
7047 
7048 static const struct got_error *
7049 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7050     struct got_tree_entry *te, struct tog_parent_trees *parents,
7051     struct got_object_id *commit_id, struct got_repository *repo)
7052 {
7053 	const struct got_error *err = NULL;
7054 	char *path;
7055 	struct tog_view *blame_view;
7056 
7057 	*new_view = NULL;
7058 
7059 	err = tree_entry_path(&path, parents, te);
7060 	if (err)
7061 		return err;
7062 
7063 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7064 	if (blame_view == NULL) {
7065 		err = got_error_from_errno("view_open");
7066 		goto done;
7067 	}
7068 
7069 	err = open_blame_view(blame_view, path, commit_id, repo);
7070 	if (err) {
7071 		if (err->code == GOT_ERR_CANCELLED)
7072 			err = NULL;
7073 		view_close(blame_view);
7074 	} else
7075 		*new_view = blame_view;
7076 done:
7077 	free(path);
7078 	return err;
7079 }
7080 
7081 static const struct got_error *
7082 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7083     struct tog_tree_view_state *s)
7084 {
7085 	struct tog_view *log_view;
7086 	const struct got_error *err = NULL;
7087 	char *path;
7088 
7089 	*new_view = NULL;
7090 
7091 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7092 	if (log_view == NULL)
7093 		return got_error_from_errno("view_open");
7094 
7095 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7096 	if (err)
7097 		return err;
7098 
7099 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7100 	    path, 0);
7101 	if (err)
7102 		view_close(log_view);
7103 	else
7104 		*new_view = log_view;
7105 	free(path);
7106 	return err;
7107 }
7108 
7109 static const struct got_error *
7110 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7111     const char *head_ref_name, struct got_repository *repo)
7112 {
7113 	const struct got_error *err = NULL;
7114 	char *commit_id_str = NULL;
7115 	struct tog_tree_view_state *s = &view->state.tree;
7116 	struct got_commit_object *commit = NULL;
7117 
7118 	TAILQ_INIT(&s->parents);
7119 	STAILQ_INIT(&s->colors);
7120 
7121 	s->commit_id = got_object_id_dup(commit_id);
7122 	if (s->commit_id == NULL)
7123 		return got_error_from_errno("got_object_id_dup");
7124 
7125 	err = got_object_open_as_commit(&commit, repo, commit_id);
7126 	if (err)
7127 		goto done;
7128 
7129 	/*
7130 	 * The root is opened here and will be closed when the view is closed.
7131 	 * Any visited subtrees and their path-wise parents are opened and
7132 	 * closed on demand.
7133 	 */
7134 	err = got_object_open_as_tree(&s->root, repo,
7135 	    got_object_commit_get_tree_id(commit));
7136 	if (err)
7137 		goto done;
7138 	s->tree = s->root;
7139 
7140 	err = got_object_id_str(&commit_id_str, commit_id);
7141 	if (err != NULL)
7142 		goto done;
7143 
7144 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7145 		err = got_error_from_errno("asprintf");
7146 		goto done;
7147 	}
7148 
7149 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7150 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7151 	if (head_ref_name) {
7152 		s->head_ref_name = strdup(head_ref_name);
7153 		if (s->head_ref_name == NULL) {
7154 			err = got_error_from_errno("strdup");
7155 			goto done;
7156 		}
7157 	}
7158 	s->repo = repo;
7159 
7160 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7161 		err = add_color(&s->colors, "\\$$",
7162 		    TOG_COLOR_TREE_SUBMODULE,
7163 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7164 		if (err)
7165 			goto done;
7166 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7167 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7168 		if (err)
7169 			goto done;
7170 		err = add_color(&s->colors, "/$",
7171 		    TOG_COLOR_TREE_DIRECTORY,
7172 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7173 		if (err)
7174 			goto done;
7175 
7176 		err = add_color(&s->colors, "\\*$",
7177 		    TOG_COLOR_TREE_EXECUTABLE,
7178 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7179 		if (err)
7180 			goto done;
7181 
7182 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7183 		    get_color_value("TOG_COLOR_COMMIT"));
7184 		if (err)
7185 			goto done;
7186 	}
7187 
7188 	view->show = show_tree_view;
7189 	view->input = input_tree_view;
7190 	view->close = close_tree_view;
7191 	view->search_start = search_start_tree_view;
7192 	view->search_next = search_next_tree_view;
7193 done:
7194 	free(commit_id_str);
7195 	if (commit)
7196 		got_object_commit_close(commit);
7197 	if (err)
7198 		close_tree_view(view);
7199 	return err;
7200 }
7201 
7202 static const struct got_error *
7203 close_tree_view(struct tog_view *view)
7204 {
7205 	struct tog_tree_view_state *s = &view->state.tree;
7206 
7207 	free_colors(&s->colors);
7208 	free(s->tree_label);
7209 	s->tree_label = NULL;
7210 	free(s->commit_id);
7211 	s->commit_id = NULL;
7212 	free(s->head_ref_name);
7213 	s->head_ref_name = NULL;
7214 	while (!TAILQ_EMPTY(&s->parents)) {
7215 		struct tog_parent_tree *parent;
7216 		parent = TAILQ_FIRST(&s->parents);
7217 		TAILQ_REMOVE(&s->parents, parent, entry);
7218 		if (parent->tree != s->root)
7219 			got_object_tree_close(parent->tree);
7220 		free(parent);
7221 
7222 	}
7223 	if (s->tree != NULL && s->tree != s->root)
7224 		got_object_tree_close(s->tree);
7225 	if (s->root)
7226 		got_object_tree_close(s->root);
7227 	return NULL;
7228 }
7229 
7230 static const struct got_error *
7231 search_start_tree_view(struct tog_view *view)
7232 {
7233 	struct tog_tree_view_state *s = &view->state.tree;
7234 
7235 	s->matched_entry = NULL;
7236 	return NULL;
7237 }
7238 
7239 static int
7240 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7241 {
7242 	regmatch_t regmatch;
7243 
7244 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7245 	    0) == 0;
7246 }
7247 
7248 static const struct got_error *
7249 search_next_tree_view(struct tog_view *view)
7250 {
7251 	struct tog_tree_view_state *s = &view->state.tree;
7252 	struct got_tree_entry *te = NULL;
7253 
7254 	if (!view->searching) {
7255 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7256 		return NULL;
7257 	}
7258 
7259 	if (s->matched_entry) {
7260 		if (view->searching == TOG_SEARCH_FORWARD) {
7261 			if (s->selected_entry)
7262 				te = got_tree_entry_get_next(s->tree,
7263 				    s->selected_entry);
7264 			else
7265 				te = got_object_tree_get_first_entry(s->tree);
7266 		} else {
7267 			if (s->selected_entry == NULL)
7268 				te = got_object_tree_get_last_entry(s->tree);
7269 			else
7270 				te = got_tree_entry_get_prev(s->tree,
7271 				    s->selected_entry);
7272 		}
7273 	} else {
7274 		if (s->selected_entry)
7275 			te = s->selected_entry;
7276 		else if (view->searching == TOG_SEARCH_FORWARD)
7277 			te = got_object_tree_get_first_entry(s->tree);
7278 		else
7279 			te = got_object_tree_get_last_entry(s->tree);
7280 	}
7281 
7282 	while (1) {
7283 		if (te == NULL) {
7284 			if (s->matched_entry == NULL) {
7285 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7286 				return NULL;
7287 			}
7288 			if (view->searching == TOG_SEARCH_FORWARD)
7289 				te = got_object_tree_get_first_entry(s->tree);
7290 			else
7291 				te = got_object_tree_get_last_entry(s->tree);
7292 		}
7293 
7294 		if (match_tree_entry(te, &view->regex)) {
7295 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7296 			s->matched_entry = te;
7297 			break;
7298 		}
7299 
7300 		if (view->searching == TOG_SEARCH_FORWARD)
7301 			te = got_tree_entry_get_next(s->tree, te);
7302 		else
7303 			te = got_tree_entry_get_prev(s->tree, te);
7304 	}
7305 
7306 	if (s->matched_entry) {
7307 		s->first_displayed_entry = s->matched_entry;
7308 		s->selected = 0;
7309 	}
7310 
7311 	return NULL;
7312 }
7313 
7314 static const struct got_error *
7315 show_tree_view(struct tog_view *view)
7316 {
7317 	const struct got_error *err = NULL;
7318 	struct tog_tree_view_state *s = &view->state.tree;
7319 	char *parent_path;
7320 
7321 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7322 	if (err)
7323 		return err;
7324 
7325 	err = draw_tree_entries(view, parent_path);
7326 	free(parent_path);
7327 
7328 	view_border(view);
7329 	return err;
7330 }
7331 
7332 static const struct got_error *
7333 tree_goto_line(struct tog_view *view, int nlines)
7334 {
7335 	const struct got_error		 *err = NULL;
7336 	struct tog_tree_view_state	 *s = &view->state.tree;
7337 	struct got_tree_entry		**fte, **lte, **ste;
7338 	int				  g, last, first = 1, i = 1;
7339 	int				  root = s->tree == s->root;
7340 	int				  off = root ? 1 : 2;
7341 
7342 	g = view->gline;
7343 	view->gline = 0;
7344 
7345 	if (g == 0)
7346 		g = 1;
7347 	else if (g > got_object_tree_get_nentries(s->tree))
7348 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7349 
7350 	fte = &s->first_displayed_entry;
7351 	lte = &s->last_displayed_entry;
7352 	ste = &s->selected_entry;
7353 
7354 	if (*fte != NULL) {
7355 		first = got_tree_entry_get_index(*fte);
7356 		first += off;  /* account for ".." */
7357 	}
7358 	last = got_tree_entry_get_index(*lte);
7359 	last += off;
7360 
7361 	if (g >= first && g <= last && g - first < nlines) {
7362 		s->selected = g - first;
7363 		return NULL;	/* gline is on the current page */
7364 	}
7365 
7366 	if (*ste != NULL) {
7367 		i = got_tree_entry_get_index(*ste);
7368 		i += off;
7369 	}
7370 
7371 	if (i < g) {
7372 		err = tree_scroll_down(view, g - i);
7373 		if (err)
7374 			return err;
7375 		if (got_tree_entry_get_index(*lte) >=
7376 		    got_object_tree_get_nentries(s->tree) - 1 &&
7377 		    first + s->selected < g &&
7378 		    s->selected < s->ndisplayed - 1) {
7379 			first = got_tree_entry_get_index(*fte);
7380 			first += off;
7381 			s->selected = g - first;
7382 		}
7383 	} else if (i > g)
7384 		tree_scroll_up(s, i - g);
7385 
7386 	if (g < nlines &&
7387 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7388 		s->selected = g - 1;
7389 
7390 	return NULL;
7391 }
7392 
7393 static const struct got_error *
7394 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7395 {
7396 	const struct got_error *err = NULL;
7397 	struct tog_tree_view_state *s = &view->state.tree;
7398 	struct got_tree_entry *te;
7399 	int n, nscroll = view->nlines - 3;
7400 
7401 	if (view->gline)
7402 		return tree_goto_line(view, nscroll);
7403 
7404 	switch (ch) {
7405 	case '0':
7406 	case '$':
7407 	case KEY_RIGHT:
7408 	case 'l':
7409 	case KEY_LEFT:
7410 	case 'h':
7411 		horizontal_scroll_input(view, ch);
7412 		break;
7413 	case 'i':
7414 		s->show_ids = !s->show_ids;
7415 		view->count = 0;
7416 		break;
7417 	case 'L':
7418 		view->count = 0;
7419 		if (!s->selected_entry)
7420 			break;
7421 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7422 		break;
7423 	case 'R':
7424 		view->count = 0;
7425 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7426 		break;
7427 	case 'g':
7428 	case '=':
7429 	case KEY_HOME:
7430 		s->selected = 0;
7431 		view->count = 0;
7432 		if (s->tree == s->root)
7433 			s->first_displayed_entry =
7434 			    got_object_tree_get_first_entry(s->tree);
7435 		else
7436 			s->first_displayed_entry = NULL;
7437 		break;
7438 	case 'G':
7439 	case '*':
7440 	case KEY_END: {
7441 		int eos = view->nlines - 3;
7442 
7443 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7444 			--eos;  /* border */
7445 		s->selected = 0;
7446 		view->count = 0;
7447 		te = got_object_tree_get_last_entry(s->tree);
7448 		for (n = 0; n < eos; n++) {
7449 			if (te == NULL) {
7450 				if (s->tree != s->root) {
7451 					s->first_displayed_entry = NULL;
7452 					n++;
7453 				}
7454 				break;
7455 			}
7456 			s->first_displayed_entry = te;
7457 			te = got_tree_entry_get_prev(s->tree, te);
7458 		}
7459 		if (n > 0)
7460 			s->selected = n - 1;
7461 		break;
7462 	}
7463 	case 'k':
7464 	case KEY_UP:
7465 	case CTRL('p'):
7466 		if (s->selected > 0) {
7467 			s->selected--;
7468 			break;
7469 		}
7470 		tree_scroll_up(s, 1);
7471 		if (s->selected_entry == NULL ||
7472 		    (s->tree == s->root && s->selected_entry ==
7473 		     got_object_tree_get_first_entry(s->tree)))
7474 			view->count = 0;
7475 		break;
7476 	case CTRL('u'):
7477 	case 'u':
7478 		nscroll /= 2;
7479 		/* FALL THROUGH */
7480 	case KEY_PPAGE:
7481 	case CTRL('b'):
7482 	case 'b':
7483 		if (s->tree == s->root) {
7484 			if (got_object_tree_get_first_entry(s->tree) ==
7485 			    s->first_displayed_entry)
7486 				s->selected -= MIN(s->selected, nscroll);
7487 		} else {
7488 			if (s->first_displayed_entry == NULL)
7489 				s->selected -= MIN(s->selected, nscroll);
7490 		}
7491 		tree_scroll_up(s, MAX(0, nscroll));
7492 		if (s->selected_entry == NULL ||
7493 		    (s->tree == s->root && s->selected_entry ==
7494 		     got_object_tree_get_first_entry(s->tree)))
7495 			view->count = 0;
7496 		break;
7497 	case 'j':
7498 	case KEY_DOWN:
7499 	case CTRL('n'):
7500 		if (s->selected < s->ndisplayed - 1) {
7501 			s->selected++;
7502 			break;
7503 		}
7504 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7505 		    == NULL) {
7506 			/* can't scroll any further */
7507 			view->count = 0;
7508 			break;
7509 		}
7510 		tree_scroll_down(view, 1);
7511 		break;
7512 	case CTRL('d'):
7513 	case 'd':
7514 		nscroll /= 2;
7515 		/* FALL THROUGH */
7516 	case KEY_NPAGE:
7517 	case CTRL('f'):
7518 	case 'f':
7519 	case ' ':
7520 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7521 		    == NULL) {
7522 			/* can't scroll any further; move cursor down */
7523 			if (s->selected < s->ndisplayed - 1)
7524 				s->selected += MIN(nscroll,
7525 				    s->ndisplayed - s->selected - 1);
7526 			else
7527 				view->count = 0;
7528 			break;
7529 		}
7530 		tree_scroll_down(view, nscroll);
7531 		break;
7532 	case KEY_ENTER:
7533 	case '\r':
7534 	case KEY_BACKSPACE:
7535 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7536 			struct tog_parent_tree *parent;
7537 			/* user selected '..' */
7538 			if (s->tree == s->root) {
7539 				view->count = 0;
7540 				break;
7541 			}
7542 			parent = TAILQ_FIRST(&s->parents);
7543 			TAILQ_REMOVE(&s->parents, parent,
7544 			    entry);
7545 			got_object_tree_close(s->tree);
7546 			s->tree = parent->tree;
7547 			s->first_displayed_entry =
7548 			    parent->first_displayed_entry;
7549 			s->selected_entry =
7550 			    parent->selected_entry;
7551 			s->selected = parent->selected;
7552 			if (s->selected > view->nlines - 3) {
7553 				err = offset_selection_down(view);
7554 				if (err)
7555 					break;
7556 			}
7557 			free(parent);
7558 		} else if (S_ISDIR(got_tree_entry_get_mode(
7559 		    s->selected_entry))) {
7560 			struct got_tree_object *subtree;
7561 			view->count = 0;
7562 			err = got_object_open_as_tree(&subtree, s->repo,
7563 			    got_tree_entry_get_id(s->selected_entry));
7564 			if (err)
7565 				break;
7566 			err = tree_view_visit_subtree(s, subtree);
7567 			if (err) {
7568 				got_object_tree_close(subtree);
7569 				break;
7570 			}
7571 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7572 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7573 		break;
7574 	case KEY_RESIZE:
7575 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7576 			s->selected = view->nlines - 4;
7577 		view->count = 0;
7578 		break;
7579 	default:
7580 		view->count = 0;
7581 		break;
7582 	}
7583 
7584 	return err;
7585 }
7586 
7587 __dead static void
7588 usage_tree(void)
7589 {
7590 	endwin();
7591 	fprintf(stderr,
7592 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7593 	    getprogname());
7594 	exit(1);
7595 }
7596 
7597 static const struct got_error *
7598 cmd_tree(int argc, char *argv[])
7599 {
7600 	const struct got_error *error;
7601 	struct got_repository *repo = NULL;
7602 	struct got_worktree *worktree = NULL;
7603 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7604 	struct got_object_id *commit_id = NULL;
7605 	struct got_commit_object *commit = NULL;
7606 	const char *commit_id_arg = NULL;
7607 	char *label = NULL;
7608 	struct got_reference *ref = NULL;
7609 	const char *head_ref_name = NULL;
7610 	int ch;
7611 	struct tog_view *view;
7612 	int *pack_fds = NULL;
7613 
7614 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7615 		switch (ch) {
7616 		case 'c':
7617 			commit_id_arg = optarg;
7618 			break;
7619 		case 'r':
7620 			repo_path = realpath(optarg, NULL);
7621 			if (repo_path == NULL)
7622 				return got_error_from_errno2("realpath",
7623 				    optarg);
7624 			break;
7625 		default:
7626 			usage_tree();
7627 			/* NOTREACHED */
7628 		}
7629 	}
7630 
7631 	argc -= optind;
7632 	argv += optind;
7633 
7634 	if (argc > 1)
7635 		usage_tree();
7636 
7637 	error = got_repo_pack_fds_open(&pack_fds);
7638 	if (error != NULL)
7639 		goto done;
7640 
7641 	if (repo_path == NULL) {
7642 		cwd = getcwd(NULL, 0);
7643 		if (cwd == NULL)
7644 			return got_error_from_errno("getcwd");
7645 		error = got_worktree_open(&worktree, cwd);
7646 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7647 			goto done;
7648 		if (worktree)
7649 			repo_path =
7650 			    strdup(got_worktree_get_repo_path(worktree));
7651 		else
7652 			repo_path = strdup(cwd);
7653 		if (repo_path == NULL) {
7654 			error = got_error_from_errno("strdup");
7655 			goto done;
7656 		}
7657 	}
7658 
7659 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7660 	if (error != NULL)
7661 		goto done;
7662 
7663 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7664 	    repo, worktree);
7665 	if (error)
7666 		goto done;
7667 
7668 	init_curses();
7669 
7670 	error = apply_unveil(got_repo_get_path(repo), NULL);
7671 	if (error)
7672 		goto done;
7673 
7674 	error = tog_load_refs(repo, 0);
7675 	if (error)
7676 		goto done;
7677 
7678 	if (commit_id_arg == NULL) {
7679 		error = got_repo_match_object_id(&commit_id, &label,
7680 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7681 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7682 		if (error)
7683 			goto done;
7684 		head_ref_name = label;
7685 	} else {
7686 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7687 		if (error == NULL)
7688 			head_ref_name = got_ref_get_name(ref);
7689 		else if (error->code != GOT_ERR_NOT_REF)
7690 			goto done;
7691 		error = got_repo_match_object_id(&commit_id, NULL,
7692 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7693 		if (error)
7694 			goto done;
7695 	}
7696 
7697 	error = got_object_open_as_commit(&commit, repo, commit_id);
7698 	if (error)
7699 		goto done;
7700 
7701 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7702 	if (view == NULL) {
7703 		error = got_error_from_errno("view_open");
7704 		goto done;
7705 	}
7706 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7707 	if (error)
7708 		goto done;
7709 	if (!got_path_is_root_dir(in_repo_path)) {
7710 		error = tree_view_walk_path(&view->state.tree, commit,
7711 		    in_repo_path);
7712 		if (error)
7713 			goto done;
7714 	}
7715 
7716 	if (worktree) {
7717 		/* Release work tree lock. */
7718 		got_worktree_close(worktree);
7719 		worktree = NULL;
7720 	}
7721 	error = view_loop(view);
7722 done:
7723 	free(repo_path);
7724 	free(cwd);
7725 	free(commit_id);
7726 	free(label);
7727 	if (ref)
7728 		got_ref_close(ref);
7729 	if (repo) {
7730 		const struct got_error *close_err = got_repo_close(repo);
7731 		if (error == NULL)
7732 			error = close_err;
7733 	}
7734 	if (pack_fds) {
7735 		const struct got_error *pack_err =
7736 		    got_repo_pack_fds_close(pack_fds);
7737 		if (error == NULL)
7738 			error = pack_err;
7739 	}
7740 	tog_free_refs();
7741 	return error;
7742 }
7743 
7744 static const struct got_error *
7745 ref_view_load_refs(struct tog_ref_view_state *s)
7746 {
7747 	struct got_reflist_entry *sre;
7748 	struct tog_reflist_entry *re;
7749 
7750 	s->nrefs = 0;
7751 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7752 		if (strncmp(got_ref_get_name(sre->ref),
7753 		    "refs/got/", 9) == 0 &&
7754 		    strncmp(got_ref_get_name(sre->ref),
7755 		    "refs/got/backup/", 16) != 0)
7756 			continue;
7757 
7758 		re = malloc(sizeof(*re));
7759 		if (re == NULL)
7760 			return got_error_from_errno("malloc");
7761 
7762 		re->ref = got_ref_dup(sre->ref);
7763 		if (re->ref == NULL)
7764 			return got_error_from_errno("got_ref_dup");
7765 		re->idx = s->nrefs++;
7766 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7767 	}
7768 
7769 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7770 	return NULL;
7771 }
7772 
7773 static void
7774 ref_view_free_refs(struct tog_ref_view_state *s)
7775 {
7776 	struct tog_reflist_entry *re;
7777 
7778 	while (!TAILQ_EMPTY(&s->refs)) {
7779 		re = TAILQ_FIRST(&s->refs);
7780 		TAILQ_REMOVE(&s->refs, re, entry);
7781 		got_ref_close(re->ref);
7782 		free(re);
7783 	}
7784 }
7785 
7786 static const struct got_error *
7787 open_ref_view(struct tog_view *view, struct got_repository *repo)
7788 {
7789 	const struct got_error *err = NULL;
7790 	struct tog_ref_view_state *s = &view->state.ref;
7791 
7792 	s->selected_entry = 0;
7793 	s->repo = repo;
7794 
7795 	TAILQ_INIT(&s->refs);
7796 	STAILQ_INIT(&s->colors);
7797 
7798 	err = ref_view_load_refs(s);
7799 	if (err)
7800 		return err;
7801 
7802 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7803 		err = add_color(&s->colors, "^refs/heads/",
7804 		    TOG_COLOR_REFS_HEADS,
7805 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7806 		if (err)
7807 			goto done;
7808 
7809 		err = add_color(&s->colors, "^refs/tags/",
7810 		    TOG_COLOR_REFS_TAGS,
7811 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7812 		if (err)
7813 			goto done;
7814 
7815 		err = add_color(&s->colors, "^refs/remotes/",
7816 		    TOG_COLOR_REFS_REMOTES,
7817 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7818 		if (err)
7819 			goto done;
7820 
7821 		err = add_color(&s->colors, "^refs/got/backup/",
7822 		    TOG_COLOR_REFS_BACKUP,
7823 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7824 		if (err)
7825 			goto done;
7826 	}
7827 
7828 	view->show = show_ref_view;
7829 	view->input = input_ref_view;
7830 	view->close = close_ref_view;
7831 	view->search_start = search_start_ref_view;
7832 	view->search_next = search_next_ref_view;
7833 done:
7834 	if (err)
7835 		free_colors(&s->colors);
7836 	return err;
7837 }
7838 
7839 static const struct got_error *
7840 close_ref_view(struct tog_view *view)
7841 {
7842 	struct tog_ref_view_state *s = &view->state.ref;
7843 
7844 	ref_view_free_refs(s);
7845 	free_colors(&s->colors);
7846 
7847 	return NULL;
7848 }
7849 
7850 static const struct got_error *
7851 resolve_reflist_entry(struct got_object_id **commit_id,
7852     struct tog_reflist_entry *re, struct got_repository *repo)
7853 {
7854 	const struct got_error *err = NULL;
7855 	struct got_object_id *obj_id;
7856 	struct got_tag_object *tag = NULL;
7857 	int obj_type;
7858 
7859 	*commit_id = NULL;
7860 
7861 	err = got_ref_resolve(&obj_id, repo, re->ref);
7862 	if (err)
7863 		return err;
7864 
7865 	err = got_object_get_type(&obj_type, repo, obj_id);
7866 	if (err)
7867 		goto done;
7868 
7869 	switch (obj_type) {
7870 	case GOT_OBJ_TYPE_COMMIT:
7871 		*commit_id = obj_id;
7872 		break;
7873 	case GOT_OBJ_TYPE_TAG:
7874 		err = got_object_open_as_tag(&tag, repo, obj_id);
7875 		if (err)
7876 			goto done;
7877 		free(obj_id);
7878 		err = got_object_get_type(&obj_type, repo,
7879 		    got_object_tag_get_object_id(tag));
7880 		if (err)
7881 			goto done;
7882 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7883 			err = got_error(GOT_ERR_OBJ_TYPE);
7884 			goto done;
7885 		}
7886 		*commit_id = got_object_id_dup(
7887 		    got_object_tag_get_object_id(tag));
7888 		if (*commit_id == NULL) {
7889 			err = got_error_from_errno("got_object_id_dup");
7890 			goto done;
7891 		}
7892 		break;
7893 	default:
7894 		err = got_error(GOT_ERR_OBJ_TYPE);
7895 		break;
7896 	}
7897 
7898 done:
7899 	if (tag)
7900 		got_object_tag_close(tag);
7901 	if (err) {
7902 		free(*commit_id);
7903 		*commit_id = NULL;
7904 	}
7905 	return err;
7906 }
7907 
7908 static const struct got_error *
7909 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7910     struct tog_reflist_entry *re, struct got_repository *repo)
7911 {
7912 	struct tog_view *log_view;
7913 	const struct got_error *err = NULL;
7914 	struct got_object_id *commit_id = NULL;
7915 
7916 	*new_view = NULL;
7917 
7918 	err = resolve_reflist_entry(&commit_id, re, repo);
7919 	if (err) {
7920 		if (err->code != GOT_ERR_OBJ_TYPE)
7921 			return err;
7922 		else
7923 			return NULL;
7924 	}
7925 
7926 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7927 	if (log_view == NULL) {
7928 		err = got_error_from_errno("view_open");
7929 		goto done;
7930 	}
7931 
7932 	err = open_log_view(log_view, commit_id, repo,
7933 	    got_ref_get_name(re->ref), "", 0);
7934 done:
7935 	if (err)
7936 		view_close(log_view);
7937 	else
7938 		*new_view = log_view;
7939 	free(commit_id);
7940 	return err;
7941 }
7942 
7943 static void
7944 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7945 {
7946 	struct tog_reflist_entry *re;
7947 	int i = 0;
7948 
7949 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7950 		return;
7951 
7952 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7953 	while (i++ < maxscroll) {
7954 		if (re == NULL)
7955 			break;
7956 		s->first_displayed_entry = re;
7957 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7958 	}
7959 }
7960 
7961 static const struct got_error *
7962 ref_scroll_down(struct tog_view *view, int maxscroll)
7963 {
7964 	struct tog_ref_view_state *s = &view->state.ref;
7965 	struct tog_reflist_entry *next, *last;
7966 	int n = 0;
7967 
7968 	if (s->first_displayed_entry)
7969 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7970 	else
7971 		next = TAILQ_FIRST(&s->refs);
7972 
7973 	last = s->last_displayed_entry;
7974 	while (next && n++ < maxscroll) {
7975 		if (last) {
7976 			s->last_displayed_entry = last;
7977 			last = TAILQ_NEXT(last, entry);
7978 		}
7979 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7980 			s->first_displayed_entry = next;
7981 			next = TAILQ_NEXT(next, entry);
7982 		}
7983 	}
7984 
7985 	return NULL;
7986 }
7987 
7988 static const struct got_error *
7989 search_start_ref_view(struct tog_view *view)
7990 {
7991 	struct tog_ref_view_state *s = &view->state.ref;
7992 
7993 	s->matched_entry = NULL;
7994 	return NULL;
7995 }
7996 
7997 static int
7998 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7999 {
8000 	regmatch_t regmatch;
8001 
8002 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8003 	    0) == 0;
8004 }
8005 
8006 static const struct got_error *
8007 search_next_ref_view(struct tog_view *view)
8008 {
8009 	struct tog_ref_view_state *s = &view->state.ref;
8010 	struct tog_reflist_entry *re = NULL;
8011 
8012 	if (!view->searching) {
8013 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8014 		return NULL;
8015 	}
8016 
8017 	if (s->matched_entry) {
8018 		if (view->searching == TOG_SEARCH_FORWARD) {
8019 			if (s->selected_entry)
8020 				re = TAILQ_NEXT(s->selected_entry, entry);
8021 			else
8022 				re = TAILQ_PREV(s->selected_entry,
8023 				    tog_reflist_head, entry);
8024 		} else {
8025 			if (s->selected_entry == NULL)
8026 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8027 			else
8028 				re = TAILQ_PREV(s->selected_entry,
8029 				    tog_reflist_head, entry);
8030 		}
8031 	} else {
8032 		if (s->selected_entry)
8033 			re = s->selected_entry;
8034 		else if (view->searching == TOG_SEARCH_FORWARD)
8035 			re = TAILQ_FIRST(&s->refs);
8036 		else
8037 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8038 	}
8039 
8040 	while (1) {
8041 		if (re == NULL) {
8042 			if (s->matched_entry == NULL) {
8043 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8044 				return NULL;
8045 			}
8046 			if (view->searching == TOG_SEARCH_FORWARD)
8047 				re = TAILQ_FIRST(&s->refs);
8048 			else
8049 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8050 		}
8051 
8052 		if (match_reflist_entry(re, &view->regex)) {
8053 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8054 			s->matched_entry = re;
8055 			break;
8056 		}
8057 
8058 		if (view->searching == TOG_SEARCH_FORWARD)
8059 			re = TAILQ_NEXT(re, entry);
8060 		else
8061 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8062 	}
8063 
8064 	if (s->matched_entry) {
8065 		s->first_displayed_entry = s->matched_entry;
8066 		s->selected = 0;
8067 	}
8068 
8069 	return NULL;
8070 }
8071 
8072 static const struct got_error *
8073 show_ref_view(struct tog_view *view)
8074 {
8075 	const struct got_error *err = NULL;
8076 	struct tog_ref_view_state *s = &view->state.ref;
8077 	struct tog_reflist_entry *re;
8078 	char *line = NULL;
8079 	wchar_t *wline;
8080 	struct tog_color *tc;
8081 	int width, n, scrollx;
8082 	int limit = view->nlines;
8083 
8084 	werase(view->window);
8085 
8086 	s->ndisplayed = 0;
8087 	if (view_is_hsplit_top(view))
8088 		--limit;  /* border */
8089 
8090 	if (limit == 0)
8091 		return NULL;
8092 
8093 	re = s->first_displayed_entry;
8094 
8095 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8096 	    s->nrefs) == -1)
8097 		return got_error_from_errno("asprintf");
8098 
8099 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8100 	if (err) {
8101 		free(line);
8102 		return err;
8103 	}
8104 	if (view_needs_focus_indication(view))
8105 		wstandout(view->window);
8106 	waddwstr(view->window, wline);
8107 	while (width++ < view->ncols)
8108 		waddch(view->window, ' ');
8109 	if (view_needs_focus_indication(view))
8110 		wstandend(view->window);
8111 	free(wline);
8112 	wline = NULL;
8113 	free(line);
8114 	line = NULL;
8115 	if (--limit <= 0)
8116 		return NULL;
8117 
8118 	n = 0;
8119 	view->maxx = 0;
8120 	while (re && limit > 0) {
8121 		char *line = NULL;
8122 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8123 
8124 		if (s->show_date) {
8125 			struct got_commit_object *ci;
8126 			struct got_tag_object *tag;
8127 			struct got_object_id *id;
8128 			struct tm tm;
8129 			time_t t;
8130 
8131 			err = got_ref_resolve(&id, s->repo, re->ref);
8132 			if (err)
8133 				return err;
8134 			err = got_object_open_as_tag(&tag, s->repo, id);
8135 			if (err) {
8136 				if (err->code != GOT_ERR_OBJ_TYPE) {
8137 					free(id);
8138 					return err;
8139 				}
8140 				err = got_object_open_as_commit(&ci, s->repo,
8141 				    id);
8142 				if (err) {
8143 					free(id);
8144 					return err;
8145 				}
8146 				t = got_object_commit_get_committer_time(ci);
8147 				got_object_commit_close(ci);
8148 			} else {
8149 				t = got_object_tag_get_tagger_time(tag);
8150 				got_object_tag_close(tag);
8151 			}
8152 			free(id);
8153 			if (gmtime_r(&t, &tm) == NULL)
8154 				return got_error_from_errno("gmtime_r");
8155 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8156 				return got_error(GOT_ERR_NO_SPACE);
8157 		}
8158 		if (got_ref_is_symbolic(re->ref)) {
8159 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8160 			    ymd : "", got_ref_get_name(re->ref),
8161 			    got_ref_get_symref_target(re->ref)) == -1)
8162 				return got_error_from_errno("asprintf");
8163 		} else if (s->show_ids) {
8164 			struct got_object_id *id;
8165 			char *id_str;
8166 			err = got_ref_resolve(&id, s->repo, re->ref);
8167 			if (err)
8168 				return err;
8169 			err = got_object_id_str(&id_str, id);
8170 			if (err) {
8171 				free(id);
8172 				return err;
8173 			}
8174 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8175 			    got_ref_get_name(re->ref), id_str) == -1) {
8176 				err = got_error_from_errno("asprintf");
8177 				free(id);
8178 				free(id_str);
8179 				return err;
8180 			}
8181 			free(id);
8182 			free(id_str);
8183 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8184 		    got_ref_get_name(re->ref)) == -1)
8185 			return got_error_from_errno("asprintf");
8186 
8187 		/* use full line width to determine view->maxx */
8188 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8189 		if (err) {
8190 			free(line);
8191 			return err;
8192 		}
8193 		view->maxx = MAX(view->maxx, width);
8194 		free(wline);
8195 		wline = NULL;
8196 
8197 		err = format_line(&wline, &width, &scrollx, line, view->x,
8198 		    view->ncols, 0, 0);
8199 		if (err) {
8200 			free(line);
8201 			return err;
8202 		}
8203 		if (n == s->selected) {
8204 			if (view->focussed)
8205 				wstandout(view->window);
8206 			s->selected_entry = re;
8207 		}
8208 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8209 		if (tc)
8210 			wattr_on(view->window,
8211 			    COLOR_PAIR(tc->colorpair), NULL);
8212 		waddwstr(view->window, &wline[scrollx]);
8213 		if (tc)
8214 			wattr_off(view->window,
8215 			    COLOR_PAIR(tc->colorpair), NULL);
8216 		if (width < view->ncols)
8217 			waddch(view->window, '\n');
8218 		if (n == s->selected && view->focussed)
8219 			wstandend(view->window);
8220 		free(line);
8221 		free(wline);
8222 		wline = NULL;
8223 		n++;
8224 		s->ndisplayed++;
8225 		s->last_displayed_entry = re;
8226 
8227 		limit--;
8228 		re = TAILQ_NEXT(re, entry);
8229 	}
8230 
8231 	view_border(view);
8232 	return err;
8233 }
8234 
8235 static const struct got_error *
8236 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8237     struct tog_reflist_entry *re, struct got_repository *repo)
8238 {
8239 	const struct got_error *err = NULL;
8240 	struct got_object_id *commit_id = NULL;
8241 	struct tog_view *tree_view;
8242 
8243 	*new_view = NULL;
8244 
8245 	err = resolve_reflist_entry(&commit_id, re, repo);
8246 	if (err) {
8247 		if (err->code != GOT_ERR_OBJ_TYPE)
8248 			return err;
8249 		else
8250 			return NULL;
8251 	}
8252 
8253 
8254 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8255 	if (tree_view == NULL) {
8256 		err = got_error_from_errno("view_open");
8257 		goto done;
8258 	}
8259 
8260 	err = open_tree_view(tree_view, commit_id,
8261 	    got_ref_get_name(re->ref), repo);
8262 	if (err)
8263 		goto done;
8264 
8265 	*new_view = tree_view;
8266 done:
8267 	free(commit_id);
8268 	return err;
8269 }
8270 
8271 static const struct got_error *
8272 ref_goto_line(struct tog_view *view, int nlines)
8273 {
8274 	const struct got_error		*err = NULL;
8275 	struct tog_ref_view_state	*s = &view->state.ref;
8276 	int				 g, idx = s->selected_entry->idx;
8277 
8278 	g = view->gline;
8279 	view->gline = 0;
8280 
8281 	if (g == 0)
8282 		g = 1;
8283 	else if (g > s->nrefs)
8284 		g = s->nrefs;
8285 
8286 	if (g >= s->first_displayed_entry->idx + 1 &&
8287 	    g <= s->last_displayed_entry->idx + 1 &&
8288 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8289 		s->selected = g - s->first_displayed_entry->idx - 1;
8290 		return NULL;
8291 	}
8292 
8293 	if (idx + 1 < g) {
8294 		err = ref_scroll_down(view, g - idx - 1);
8295 		if (err)
8296 			return err;
8297 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8298 		    s->first_displayed_entry->idx + s->selected < g &&
8299 		    s->selected < s->ndisplayed - 1)
8300 			s->selected = g - s->first_displayed_entry->idx - 1;
8301 	} else if (idx + 1 > g)
8302 		ref_scroll_up(s, idx - g + 1);
8303 
8304 	if (g < nlines && s->first_displayed_entry->idx == 0)
8305 		s->selected = g - 1;
8306 
8307 	return NULL;
8308 
8309 }
8310 
8311 static const struct got_error *
8312 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8313 {
8314 	const struct got_error *err = NULL;
8315 	struct tog_ref_view_state *s = &view->state.ref;
8316 	struct tog_reflist_entry *re;
8317 	int n, nscroll = view->nlines - 1;
8318 
8319 	if (view->gline)
8320 		return ref_goto_line(view, nscroll);
8321 
8322 	switch (ch) {
8323 	case '0':
8324 	case '$':
8325 	case KEY_RIGHT:
8326 	case 'l':
8327 	case KEY_LEFT:
8328 	case 'h':
8329 		horizontal_scroll_input(view, ch);
8330 		break;
8331 	case 'i':
8332 		s->show_ids = !s->show_ids;
8333 		view->count = 0;
8334 		break;
8335 	case 'm':
8336 		s->show_date = !s->show_date;
8337 		view->count = 0;
8338 		break;
8339 	case 'o':
8340 		s->sort_by_date = !s->sort_by_date;
8341 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8342 		view->count = 0;
8343 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8344 		    got_ref_cmp_by_commit_timestamp_descending :
8345 		    tog_ref_cmp_by_name, s->repo);
8346 		if (err)
8347 			break;
8348 		got_reflist_object_id_map_free(tog_refs_idmap);
8349 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8350 		    &tog_refs, s->repo);
8351 		if (err)
8352 			break;
8353 		ref_view_free_refs(s);
8354 		err = ref_view_load_refs(s);
8355 		break;
8356 	case KEY_ENTER:
8357 	case '\r':
8358 		view->count = 0;
8359 		if (!s->selected_entry)
8360 			break;
8361 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8362 		break;
8363 	case 'T':
8364 		view->count = 0;
8365 		if (!s->selected_entry)
8366 			break;
8367 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8368 		break;
8369 	case 'g':
8370 	case '=':
8371 	case KEY_HOME:
8372 		s->selected = 0;
8373 		view->count = 0;
8374 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8375 		break;
8376 	case 'G':
8377 	case '*':
8378 	case KEY_END: {
8379 		int eos = view->nlines - 1;
8380 
8381 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8382 			--eos;  /* border */
8383 		s->selected = 0;
8384 		view->count = 0;
8385 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8386 		for (n = 0; n < eos; n++) {
8387 			if (re == NULL)
8388 				break;
8389 			s->first_displayed_entry = re;
8390 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8391 		}
8392 		if (n > 0)
8393 			s->selected = n - 1;
8394 		break;
8395 	}
8396 	case 'k':
8397 	case KEY_UP:
8398 	case CTRL('p'):
8399 		if (s->selected > 0) {
8400 			s->selected--;
8401 			break;
8402 		}
8403 		ref_scroll_up(s, 1);
8404 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8405 			view->count = 0;
8406 		break;
8407 	case CTRL('u'):
8408 	case 'u':
8409 		nscroll /= 2;
8410 		/* FALL THROUGH */
8411 	case KEY_PPAGE:
8412 	case CTRL('b'):
8413 	case 'b':
8414 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8415 			s->selected -= MIN(nscroll, s->selected);
8416 		ref_scroll_up(s, MAX(0, nscroll));
8417 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8418 			view->count = 0;
8419 		break;
8420 	case 'j':
8421 	case KEY_DOWN:
8422 	case CTRL('n'):
8423 		if (s->selected < s->ndisplayed - 1) {
8424 			s->selected++;
8425 			break;
8426 		}
8427 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8428 			/* can't scroll any further */
8429 			view->count = 0;
8430 			break;
8431 		}
8432 		ref_scroll_down(view, 1);
8433 		break;
8434 	case CTRL('d'):
8435 	case 'd':
8436 		nscroll /= 2;
8437 		/* FALL THROUGH */
8438 	case KEY_NPAGE:
8439 	case CTRL('f'):
8440 	case 'f':
8441 	case ' ':
8442 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8443 			/* can't scroll any further; move cursor down */
8444 			if (s->selected < s->ndisplayed - 1)
8445 				s->selected += MIN(nscroll,
8446 				    s->ndisplayed - s->selected - 1);
8447 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8448 				s->selected += s->ndisplayed - s->selected - 1;
8449 			view->count = 0;
8450 			break;
8451 		}
8452 		ref_scroll_down(view, nscroll);
8453 		break;
8454 	case CTRL('l'):
8455 		view->count = 0;
8456 		tog_free_refs();
8457 		err = tog_load_refs(s->repo, s->sort_by_date);
8458 		if (err)
8459 			break;
8460 		ref_view_free_refs(s);
8461 		err = ref_view_load_refs(s);
8462 		break;
8463 	case KEY_RESIZE:
8464 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8465 			s->selected = view->nlines - 2;
8466 		break;
8467 	default:
8468 		view->count = 0;
8469 		break;
8470 	}
8471 
8472 	return err;
8473 }
8474 
8475 __dead static void
8476 usage_ref(void)
8477 {
8478 	endwin();
8479 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8480 	    getprogname());
8481 	exit(1);
8482 }
8483 
8484 static const struct got_error *
8485 cmd_ref(int argc, char *argv[])
8486 {
8487 	const struct got_error *error;
8488 	struct got_repository *repo = NULL;
8489 	struct got_worktree *worktree = NULL;
8490 	char *cwd = NULL, *repo_path = NULL;
8491 	int ch;
8492 	struct tog_view *view;
8493 	int *pack_fds = NULL;
8494 
8495 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8496 		switch (ch) {
8497 		case 'r':
8498 			repo_path = realpath(optarg, NULL);
8499 			if (repo_path == NULL)
8500 				return got_error_from_errno2("realpath",
8501 				    optarg);
8502 			break;
8503 		default:
8504 			usage_ref();
8505 			/* NOTREACHED */
8506 		}
8507 	}
8508 
8509 	argc -= optind;
8510 	argv += optind;
8511 
8512 	if (argc > 1)
8513 		usage_ref();
8514 
8515 	error = got_repo_pack_fds_open(&pack_fds);
8516 	if (error != NULL)
8517 		goto done;
8518 
8519 	if (repo_path == NULL) {
8520 		cwd = getcwd(NULL, 0);
8521 		if (cwd == NULL)
8522 			return got_error_from_errno("getcwd");
8523 		error = got_worktree_open(&worktree, cwd);
8524 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8525 			goto done;
8526 		if (worktree)
8527 			repo_path =
8528 			    strdup(got_worktree_get_repo_path(worktree));
8529 		else
8530 			repo_path = strdup(cwd);
8531 		if (repo_path == NULL) {
8532 			error = got_error_from_errno("strdup");
8533 			goto done;
8534 		}
8535 	}
8536 
8537 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8538 	if (error != NULL)
8539 		goto done;
8540 
8541 	init_curses();
8542 
8543 	error = apply_unveil(got_repo_get_path(repo), NULL);
8544 	if (error)
8545 		goto done;
8546 
8547 	error = tog_load_refs(repo, 0);
8548 	if (error)
8549 		goto done;
8550 
8551 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8552 	if (view == NULL) {
8553 		error = got_error_from_errno("view_open");
8554 		goto done;
8555 	}
8556 
8557 	error = open_ref_view(view, repo);
8558 	if (error)
8559 		goto done;
8560 
8561 	if (worktree) {
8562 		/* Release work tree lock. */
8563 		got_worktree_close(worktree);
8564 		worktree = NULL;
8565 	}
8566 	error = view_loop(view);
8567 done:
8568 	free(repo_path);
8569 	free(cwd);
8570 	if (repo) {
8571 		const struct got_error *close_err = got_repo_close(repo);
8572 		if (close_err)
8573 			error = close_err;
8574 	}
8575 	if (pack_fds) {
8576 		const struct got_error *pack_err =
8577 		    got_repo_pack_fds_close(pack_fds);
8578 		if (error == NULL)
8579 			error = pack_err;
8580 	}
8581 	tog_free_refs();
8582 	return error;
8583 }
8584 
8585 static const struct got_error*
8586 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8587     const char *str)
8588 {
8589 	size_t len;
8590 
8591 	if (win == NULL)
8592 		win = stdscr;
8593 
8594 	len = strlen(str);
8595 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8596 
8597 	if (focus)
8598 		wstandout(win);
8599 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8600 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8601 	if (focus)
8602 		wstandend(win);
8603 
8604 	return NULL;
8605 }
8606 
8607 static const struct got_error *
8608 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8609 {
8610 	off_t *p;
8611 
8612 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8613 	if (p == NULL) {
8614 		free(*line_offsets);
8615 		*line_offsets = NULL;
8616 		return got_error_from_errno("reallocarray");
8617 	}
8618 
8619 	*line_offsets = p;
8620 	(*line_offsets)[*nlines] = off;
8621 	++(*nlines);
8622 	return NULL;
8623 }
8624 
8625 static const struct got_error *
8626 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8627 {
8628 	*ret = 0;
8629 
8630 	for (;n > 0; --n, ++km) {
8631 		char	*t0, *t, *k;
8632 		size_t	 len = 1;
8633 
8634 		if (km->keys == NULL)
8635 			continue;
8636 
8637 		t = t0 = strdup(km->keys);
8638 		if (t0 == NULL)
8639 			return got_error_from_errno("strdup");
8640 
8641 		len += strlen(t);
8642 		while ((k = strsep(&t, " ")) != NULL)
8643 			len += strlen(k) > 1 ? 2 : 0;
8644 		free(t0);
8645 		*ret = MAX(*ret, len);
8646 	}
8647 
8648 	return NULL;
8649 }
8650 
8651 /*
8652  * Write keymap section headers, keys, and key info in km to f.
8653  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8654  * wrap control and symbolic keys in guillemets, else use <>.
8655  */
8656 static const struct got_error *
8657 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8658 {
8659 	int n, len = width;
8660 
8661 	if (km->keys) {
8662 		static const char *u8_glyph[] = {
8663 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8664 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8665 		};
8666 		char	*t0, *t, *k;
8667 		int	 cs, s, first = 1;
8668 
8669 		cs = got_locale_is_utf8();
8670 
8671 		t = t0 = strdup(km->keys);
8672 		if (t0 == NULL)
8673 			return got_error_from_errno("strdup");
8674 
8675 		len = strlen(km->keys);
8676 		while ((k = strsep(&t, " ")) != NULL) {
8677 			s = strlen(k) > 1;  /* control or symbolic key */
8678 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8679 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8680 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8681 			if (n < 0) {
8682 				free(t0);
8683 				return got_error_from_errno("fprintf");
8684 			}
8685 			first = 0;
8686 			len += s ? 2 : 0;
8687 			*off += n;
8688 		}
8689 		free(t0);
8690 	}
8691 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8692 	if (n < 0)
8693 		return got_error_from_errno("fprintf");
8694 	*off += n;
8695 
8696 	return NULL;
8697 }
8698 
8699 static const struct got_error *
8700 format_help(struct tog_help_view_state *s)
8701 {
8702 	const struct got_error		*err = NULL;
8703 	off_t				 off = 0;
8704 	int				 i, max, n, show = s->all;
8705 	static const struct tog_key_map	 km[] = {
8706 #define KEYMAP_(info, type)	{ NULL, (info), type }
8707 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8708 		GENERATE_HELP
8709 #undef KEYMAP_
8710 #undef KEY_
8711 	};
8712 
8713 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8714 	if (err)
8715 		return err;
8716 
8717 	n = nitems(km);
8718 	err = max_key_str(&max, km, n);
8719 	if (err)
8720 		return err;
8721 
8722 	for (i = 0; i < n; ++i) {
8723 		if (km[i].keys == NULL) {
8724 			show = s->all;
8725 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8726 			    km[i].type == s->type || s->all)
8727 				show = 1;
8728 		}
8729 		if (show) {
8730 			err = format_help_line(&off, s->f, &km[i], max);
8731 			if (err)
8732 				return err;
8733 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8734 			if (err)
8735 				return err;
8736 		}
8737 	}
8738 	fputc('\n', s->f);
8739 	++off;
8740 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8741 	return err;
8742 }
8743 
8744 static const struct got_error *
8745 create_help(struct tog_help_view_state *s)
8746 {
8747 	FILE			*f;
8748 	const struct got_error	*err;
8749 
8750 	free(s->line_offsets);
8751 	s->line_offsets = NULL;
8752 	s->nlines = 0;
8753 
8754 	f = got_opentemp();
8755 	if (f == NULL)
8756 		return got_error_from_errno("got_opentemp");
8757 	s->f = f;
8758 
8759 	err = format_help(s);
8760 	if (err)
8761 		return err;
8762 
8763 	if (s->f && fflush(s->f) != 0)
8764 		return got_error_from_errno("fflush");
8765 
8766 	return NULL;
8767 }
8768 
8769 static const struct got_error *
8770 search_start_help_view(struct tog_view *view)
8771 {
8772 	view->state.help.matched_line = 0;
8773 	return NULL;
8774 }
8775 
8776 static void
8777 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8778     size_t *nlines, int **first, int **last, int **match, int **selected)
8779 {
8780 	struct tog_help_view_state *s = &view->state.help;
8781 
8782 	*f = s->f;
8783 	*nlines = s->nlines;
8784 	*line_offsets = s->line_offsets;
8785 	*match = &s->matched_line;
8786 	*first = &s->first_displayed_line;
8787 	*last = &s->last_displayed_line;
8788 	*selected = &s->selected_line;
8789 }
8790 
8791 static const struct got_error *
8792 show_help_view(struct tog_view *view)
8793 {
8794 	struct tog_help_view_state	*s = &view->state.help;
8795 	const struct got_error		*err;
8796 	regmatch_t			*regmatch = &view->regmatch;
8797 	wchar_t				*wline;
8798 	char				*line;
8799 	ssize_t				 linelen;
8800 	size_t				 linesz = 0;
8801 	int				 width, nprinted = 0, rc = 0;
8802 	int				 eos = view->nlines;
8803 
8804 	if (view_is_hsplit_top(view))
8805 		--eos;  /* account for border */
8806 
8807 	s->lineno = 0;
8808 	rewind(s->f);
8809 	werase(view->window);
8810 
8811 	if (view->gline > s->nlines - 1)
8812 		view->gline = s->nlines - 1;
8813 
8814 	err = win_draw_center(view->window, 0, 0, view->ncols,
8815 	    view_needs_focus_indication(view),
8816 	    "tog help (press q to return to tog)");
8817 	if (err)
8818 		return err;
8819 	if (eos <= 1)
8820 		return NULL;
8821 	waddstr(view->window, "\n\n");
8822 	eos -= 2;
8823 
8824 	s->eof = 0;
8825 	view->maxx = 0;
8826 	line = NULL;
8827 	while (eos > 0 && nprinted < eos) {
8828 		attr_t attr = 0;
8829 
8830 		linelen = getline(&line, &linesz, s->f);
8831 		if (linelen == -1) {
8832 			if (!feof(s->f)) {
8833 				free(line);
8834 				return got_ferror(s->f, GOT_ERR_IO);
8835 			}
8836 			s->eof = 1;
8837 			break;
8838 		}
8839 		if (++s->lineno < s->first_displayed_line)
8840 			continue;
8841 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8842 			continue;
8843 		if (s->lineno == view->hiline)
8844 			attr = A_STANDOUT;
8845 
8846 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8847 		    view->x ? 1 : 0);
8848 		if (err) {
8849 			free(line);
8850 			return err;
8851 		}
8852 		view->maxx = MAX(view->maxx, width);
8853 		free(wline);
8854 		wline = NULL;
8855 
8856 		if (attr)
8857 			wattron(view->window, attr);
8858 		if (s->first_displayed_line + nprinted == s->matched_line &&
8859 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8860 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8861 			    view->window, view->x, regmatch);
8862 			if (err) {
8863 				free(line);
8864 				return err;
8865 			}
8866 		} else {
8867 			int skip;
8868 
8869 			err = format_line(&wline, &width, &skip, line,
8870 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8871 			if (err) {
8872 				free(line);
8873 				return err;
8874 			}
8875 			waddwstr(view->window, &wline[skip]);
8876 			free(wline);
8877 			wline = NULL;
8878 		}
8879 		if (s->lineno == view->hiline) {
8880 			while (width++ < view->ncols)
8881 				waddch(view->window, ' ');
8882 		} else {
8883 			if (width < view->ncols)
8884 				waddch(view->window, '\n');
8885 		}
8886 		if (attr)
8887 			wattroff(view->window, attr);
8888 		if (++nprinted == 1)
8889 			s->first_displayed_line = s->lineno;
8890 	}
8891 	free(line);
8892 	if (nprinted > 0)
8893 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8894 	else
8895 		s->last_displayed_line = s->first_displayed_line;
8896 
8897 	view_border(view);
8898 
8899 	if (s->eof) {
8900 		rc = waddnstr(view->window,
8901 		    "See the tog(1) manual page for full documentation",
8902 		    view->ncols - 1);
8903 		if (rc == ERR)
8904 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8905 	} else {
8906 		wmove(view->window, view->nlines - 1, 0);
8907 		wclrtoeol(view->window);
8908 		wstandout(view->window);
8909 		rc = waddnstr(view->window, "scroll down for more...",
8910 		    view->ncols - 1);
8911 		if (rc == ERR)
8912 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8913 		if (getcurx(view->window) < view->ncols - 6) {
8914 			rc = wprintw(view->window, "[%.0f%%]",
8915 			    100.00 * s->last_displayed_line / s->nlines);
8916 			if (rc == ERR)
8917 				return got_error_msg(GOT_ERR_IO, "wprintw");
8918 		}
8919 		wstandend(view->window);
8920 	}
8921 
8922 	return NULL;
8923 }
8924 
8925 static const struct got_error *
8926 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8927 {
8928 	struct tog_help_view_state	*s = &view->state.help;
8929 	const struct got_error		*err = NULL;
8930 	char				*line = NULL;
8931 	ssize_t				 linelen;
8932 	size_t				 linesz = 0;
8933 	int				 eos, nscroll;
8934 
8935 	eos = nscroll = view->nlines;
8936 	if (view_is_hsplit_top(view))
8937 		--eos;  /* border */
8938 
8939 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8940 
8941 	switch (ch) {
8942 	case '0':
8943 	case '$':
8944 	case KEY_RIGHT:
8945 	case 'l':
8946 	case KEY_LEFT:
8947 	case 'h':
8948 		horizontal_scroll_input(view, ch);
8949 		break;
8950 	case 'g':
8951 	case KEY_HOME:
8952 		s->first_displayed_line = 1;
8953 		view->count = 0;
8954 		break;
8955 	case 'G':
8956 	case KEY_END:
8957 		view->count = 0;
8958 		if (s->eof)
8959 			break;
8960 		s->first_displayed_line = (s->nlines - eos) + 3;
8961 		s->eof = 1;
8962 		break;
8963 	case 'k':
8964 	case KEY_UP:
8965 		if (s->first_displayed_line > 1)
8966 			--s->first_displayed_line;
8967 		else
8968 			view->count = 0;
8969 		break;
8970 	case CTRL('u'):
8971 	case 'u':
8972 		nscroll /= 2;
8973 		/* FALL THROUGH */
8974 	case KEY_PPAGE:
8975 	case CTRL('b'):
8976 	case 'b':
8977 		if (s->first_displayed_line == 1) {
8978 			view->count = 0;
8979 			break;
8980 		}
8981 		while (--nscroll > 0 && s->first_displayed_line > 1)
8982 			s->first_displayed_line--;
8983 		break;
8984 	case 'j':
8985 	case KEY_DOWN:
8986 	case CTRL('n'):
8987 		if (!s->eof)
8988 			++s->first_displayed_line;
8989 		else
8990 			view->count = 0;
8991 		break;
8992 	case CTRL('d'):
8993 	case 'd':
8994 		nscroll /= 2;
8995 		/* FALL THROUGH */
8996 	case KEY_NPAGE:
8997 	case CTRL('f'):
8998 	case 'f':
8999 	case ' ':
9000 		if (s->eof) {
9001 			view->count = 0;
9002 			break;
9003 		}
9004 		while (!s->eof && --nscroll > 0) {
9005 			linelen = getline(&line, &linesz, s->f);
9006 			s->first_displayed_line++;
9007 			if (linelen == -1) {
9008 				if (feof(s->f))
9009 					s->eof = 1;
9010 				else
9011 					err = got_ferror(s->f, GOT_ERR_IO);
9012 				break;
9013 			}
9014 		}
9015 		free(line);
9016 		break;
9017 	default:
9018 		view->count = 0;
9019 		break;
9020 	}
9021 
9022 	return err;
9023 }
9024 
9025 static const struct got_error *
9026 close_help_view(struct tog_view *view)
9027 {
9028 	struct tog_help_view_state *s = &view->state.help;
9029 
9030 	free(s->line_offsets);
9031 	s->line_offsets = NULL;
9032 	if (fclose(s->f) == EOF)
9033 		return got_error_from_errno("fclose");
9034 
9035 	return NULL;
9036 }
9037 
9038 static const struct got_error *
9039 reset_help_view(struct tog_view *view)
9040 {
9041 	struct tog_help_view_state *s = &view->state.help;
9042 
9043 
9044 	if (s->f && fclose(s->f) == EOF)
9045 		return got_error_from_errno("fclose");
9046 
9047 	wclear(view->window);
9048 	view->count = 0;
9049 	view->x = 0;
9050 	s->all = !s->all;
9051 	s->first_displayed_line = 1;
9052 	s->last_displayed_line = view->nlines;
9053 	s->matched_line = 0;
9054 
9055 	return create_help(s);
9056 }
9057 
9058 static const struct got_error *
9059 open_help_view(struct tog_view *view, struct tog_view *parent)
9060 {
9061 	const struct got_error		*err = NULL;
9062 	struct tog_help_view_state	*s = &view->state.help;
9063 
9064 	s->type = (enum tog_keymap_type)parent->type;
9065 	s->first_displayed_line = 1;
9066 	s->last_displayed_line = view->nlines;
9067 	s->selected_line = 1;
9068 
9069 	view->show = show_help_view;
9070 	view->input = input_help_view;
9071 	view->reset = reset_help_view;
9072 	view->close = close_help_view;
9073 	view->search_start = search_start_help_view;
9074 	view->search_setup = search_setup_help_view;
9075 	view->search_next = search_next_view_match;
9076 
9077 	err = create_help(s);
9078 	return err;
9079 }
9080 
9081 static const struct got_error *
9082 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9083     enum tog_view_type request, int y, int x)
9084 {
9085 	const struct got_error *err = NULL;
9086 
9087 	*new_view = NULL;
9088 
9089 	switch (request) {
9090 	case TOG_VIEW_DIFF:
9091 		if (view->type == TOG_VIEW_LOG) {
9092 			struct tog_log_view_state *s = &view->state.log;
9093 
9094 			err = open_diff_view_for_commit(new_view, y, x,
9095 			    s->selected_entry->commit, s->selected_entry->id,
9096 			    view, s->repo);
9097 		} else
9098 			return got_error_msg(GOT_ERR_NOT_IMPL,
9099 			    "parent/child view pair not supported");
9100 		break;
9101 	case TOG_VIEW_BLAME:
9102 		if (view->type == TOG_VIEW_TREE) {
9103 			struct tog_tree_view_state *s = &view->state.tree;
9104 
9105 			err = blame_tree_entry(new_view, y, x,
9106 			    s->selected_entry, &s->parents, s->commit_id,
9107 			    s->repo);
9108 		} else
9109 			return got_error_msg(GOT_ERR_NOT_IMPL,
9110 			    "parent/child view pair not supported");
9111 		break;
9112 	case TOG_VIEW_LOG:
9113 		if (view->type == TOG_VIEW_BLAME)
9114 			err = log_annotated_line(new_view, y, x,
9115 			    view->state.blame.repo, view->state.blame.id_to_log);
9116 		else if (view->type == TOG_VIEW_TREE)
9117 			err = log_selected_tree_entry(new_view, y, x,
9118 			    &view->state.tree);
9119 		else if (view->type == TOG_VIEW_REF)
9120 			err = log_ref_entry(new_view, y, x,
9121 			    view->state.ref.selected_entry,
9122 			    view->state.ref.repo);
9123 		else
9124 			return got_error_msg(GOT_ERR_NOT_IMPL,
9125 			    "parent/child view pair not supported");
9126 		break;
9127 	case TOG_VIEW_TREE:
9128 		if (view->type == TOG_VIEW_LOG)
9129 			err = browse_commit_tree(new_view, y, x,
9130 			    view->state.log.selected_entry,
9131 			    view->state.log.in_repo_path,
9132 			    view->state.log.head_ref_name,
9133 			    view->state.log.repo);
9134 		else if (view->type == TOG_VIEW_REF)
9135 			err = browse_ref_tree(new_view, y, x,
9136 			    view->state.ref.selected_entry,
9137 			    view->state.ref.repo);
9138 		else
9139 			return got_error_msg(GOT_ERR_NOT_IMPL,
9140 			    "parent/child view pair not supported");
9141 		break;
9142 	case TOG_VIEW_REF:
9143 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9144 		if (*new_view == NULL)
9145 			return got_error_from_errno("view_open");
9146 		if (view->type == TOG_VIEW_LOG)
9147 			err = open_ref_view(*new_view, view->state.log.repo);
9148 		else if (view->type == TOG_VIEW_TREE)
9149 			err = open_ref_view(*new_view, view->state.tree.repo);
9150 		else
9151 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9152 			    "parent/child view pair not supported");
9153 		if (err)
9154 			view_close(*new_view);
9155 		break;
9156 	case TOG_VIEW_HELP:
9157 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9158 		if (*new_view == NULL)
9159 			return got_error_from_errno("view_open");
9160 		err = open_help_view(*new_view, view);
9161 		if (err)
9162 			view_close(*new_view);
9163 		break;
9164 	default:
9165 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9166 	}
9167 
9168 	return err;
9169 }
9170 
9171 /*
9172  * If view was scrolled down to move the selected line into view when opening a
9173  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9174  */
9175 static void
9176 offset_selection_up(struct tog_view *view)
9177 {
9178 	switch (view->type) {
9179 	case TOG_VIEW_BLAME: {
9180 		struct tog_blame_view_state *s = &view->state.blame;
9181 		if (s->first_displayed_line == 1) {
9182 			s->selected_line = MAX(s->selected_line - view->offset,
9183 			    1);
9184 			break;
9185 		}
9186 		if (s->first_displayed_line > view->offset)
9187 			s->first_displayed_line -= view->offset;
9188 		else
9189 			s->first_displayed_line = 1;
9190 		s->selected_line += view->offset;
9191 		break;
9192 	}
9193 	case TOG_VIEW_LOG:
9194 		log_scroll_up(&view->state.log, view->offset);
9195 		view->state.log.selected += view->offset;
9196 		break;
9197 	case TOG_VIEW_REF:
9198 		ref_scroll_up(&view->state.ref, view->offset);
9199 		view->state.ref.selected += view->offset;
9200 		break;
9201 	case TOG_VIEW_TREE:
9202 		tree_scroll_up(&view->state.tree, view->offset);
9203 		view->state.tree.selected += view->offset;
9204 		break;
9205 	default:
9206 		break;
9207 	}
9208 
9209 	view->offset = 0;
9210 }
9211 
9212 /*
9213  * If the selected line is in the section of screen covered by the bottom split,
9214  * scroll down offset lines to move it into view and index its new position.
9215  */
9216 static const struct got_error *
9217 offset_selection_down(struct tog_view *view)
9218 {
9219 	const struct got_error	*err = NULL;
9220 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9221 	int			*selected = NULL;
9222 	int			 header, offset;
9223 
9224 	switch (view->type) {
9225 	case TOG_VIEW_BLAME: {
9226 		struct tog_blame_view_state *s = &view->state.blame;
9227 		header = 3;
9228 		scrolld = NULL;
9229 		if (s->selected_line > view->nlines - header) {
9230 			offset = abs(view->nlines - s->selected_line - header);
9231 			s->first_displayed_line += offset;
9232 			s->selected_line -= offset;
9233 			view->offset = offset;
9234 		}
9235 		break;
9236 	}
9237 	case TOG_VIEW_LOG: {
9238 		struct tog_log_view_state *s = &view->state.log;
9239 		scrolld = &log_scroll_down;
9240 		header = view_is_parent_view(view) ? 3 : 2;
9241 		selected = &s->selected;
9242 		break;
9243 	}
9244 	case TOG_VIEW_REF: {
9245 		struct tog_ref_view_state *s = &view->state.ref;
9246 		scrolld = &ref_scroll_down;
9247 		header = 3;
9248 		selected = &s->selected;
9249 		break;
9250 	}
9251 	case TOG_VIEW_TREE: {
9252 		struct tog_tree_view_state *s = &view->state.tree;
9253 		scrolld = &tree_scroll_down;
9254 		header = 5;
9255 		selected = &s->selected;
9256 		break;
9257 	}
9258 	default:
9259 		selected = NULL;
9260 		scrolld = NULL;
9261 		header = 0;
9262 		break;
9263 	}
9264 
9265 	if (selected && *selected > view->nlines - header) {
9266 		offset = abs(view->nlines - *selected - header);
9267 		view->offset = offset;
9268 		if (scrolld && offset) {
9269 			err = scrolld(view, offset);
9270 			*selected -= offset;
9271 		}
9272 	}
9273 
9274 	return err;
9275 }
9276 
9277 static void
9278 list_commands(FILE *fp)
9279 {
9280 	size_t i;
9281 
9282 	fprintf(fp, "commands:");
9283 	for (i = 0; i < nitems(tog_commands); i++) {
9284 		const struct tog_cmd *cmd = &tog_commands[i];
9285 		fprintf(fp, " %s", cmd->name);
9286 	}
9287 	fputc('\n', fp);
9288 }
9289 
9290 __dead static void
9291 usage(int hflag, int status)
9292 {
9293 	FILE *fp = (status == 0) ? stdout : stderr;
9294 
9295 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9296 	    getprogname());
9297 	if (hflag) {
9298 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9299 		list_commands(fp);
9300 	}
9301 	exit(status);
9302 }
9303 
9304 static char **
9305 make_argv(int argc, ...)
9306 {
9307 	va_list ap;
9308 	char **argv;
9309 	int i;
9310 
9311 	va_start(ap, argc);
9312 
9313 	argv = calloc(argc, sizeof(char *));
9314 	if (argv == NULL)
9315 		err(1, "calloc");
9316 	for (i = 0; i < argc; i++) {
9317 		argv[i] = strdup(va_arg(ap, char *));
9318 		if (argv[i] == NULL)
9319 			err(1, "strdup");
9320 	}
9321 
9322 	va_end(ap);
9323 	return argv;
9324 }
9325 
9326 /*
9327  * Try to convert 'tog path' into a 'tog log path' command.
9328  * The user could simply have mistyped the command rather than knowingly
9329  * provided a path. So check whether argv[0] can in fact be resolved
9330  * to a path in the HEAD commit and print a special error if not.
9331  * This hack is for mpi@ <3
9332  */
9333 static const struct got_error *
9334 tog_log_with_path(int argc, char *argv[])
9335 {
9336 	const struct got_error *error = NULL, *close_err;
9337 	const struct tog_cmd *cmd = NULL;
9338 	struct got_repository *repo = NULL;
9339 	struct got_worktree *worktree = NULL;
9340 	struct got_object_id *commit_id = NULL, *id = NULL;
9341 	struct got_commit_object *commit = NULL;
9342 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9343 	char *commit_id_str = NULL, **cmd_argv = NULL;
9344 	int *pack_fds = NULL;
9345 
9346 	cwd = getcwd(NULL, 0);
9347 	if (cwd == NULL)
9348 		return got_error_from_errno("getcwd");
9349 
9350 	error = got_repo_pack_fds_open(&pack_fds);
9351 	if (error != NULL)
9352 		goto done;
9353 
9354 	error = got_worktree_open(&worktree, cwd);
9355 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9356 		goto done;
9357 
9358 	if (worktree)
9359 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9360 	else
9361 		repo_path = strdup(cwd);
9362 	if (repo_path == NULL) {
9363 		error = got_error_from_errno("strdup");
9364 		goto done;
9365 	}
9366 
9367 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9368 	if (error != NULL)
9369 		goto done;
9370 
9371 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9372 	    repo, worktree);
9373 	if (error)
9374 		goto done;
9375 
9376 	error = tog_load_refs(repo, 0);
9377 	if (error)
9378 		goto done;
9379 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9380 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9381 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9382 	if (error)
9383 		goto done;
9384 
9385 	if (worktree) {
9386 		got_worktree_close(worktree);
9387 		worktree = NULL;
9388 	}
9389 
9390 	error = got_object_open_as_commit(&commit, repo, commit_id);
9391 	if (error)
9392 		goto done;
9393 
9394 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9395 	if (error) {
9396 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9397 			goto done;
9398 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9399 		    getprogname(), argv[0]);
9400 		usage(1, 1);
9401 		/* not reached */
9402 	}
9403 
9404 	error = got_object_id_str(&commit_id_str, commit_id);
9405 	if (error)
9406 		goto done;
9407 
9408 	cmd = &tog_commands[0]; /* log */
9409 	argc = 4;
9410 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9411 	error = cmd->cmd_main(argc, cmd_argv);
9412 done:
9413 	if (repo) {
9414 		close_err = got_repo_close(repo);
9415 		if (error == NULL)
9416 			error = close_err;
9417 	}
9418 	if (commit)
9419 		got_object_commit_close(commit);
9420 	if (worktree)
9421 		got_worktree_close(worktree);
9422 	if (pack_fds) {
9423 		const struct got_error *pack_err =
9424 		    got_repo_pack_fds_close(pack_fds);
9425 		if (error == NULL)
9426 			error = pack_err;
9427 	}
9428 	free(id);
9429 	free(commit_id_str);
9430 	free(commit_id);
9431 	free(cwd);
9432 	free(repo_path);
9433 	free(in_repo_path);
9434 	if (cmd_argv) {
9435 		int i;
9436 		for (i = 0; i < argc; i++)
9437 			free(cmd_argv[i]);
9438 		free(cmd_argv);
9439 	}
9440 	tog_free_refs();
9441 	return error;
9442 }
9443 
9444 int
9445 main(int argc, char *argv[])
9446 {
9447 	const struct got_error *error = NULL;
9448 	const struct tog_cmd *cmd = NULL;
9449 	int ch, hflag = 0, Vflag = 0;
9450 	char **cmd_argv = NULL;
9451 	static const struct option longopts[] = {
9452 	    { "version", no_argument, NULL, 'V' },
9453 	    { NULL, 0, NULL, 0}
9454 	};
9455 	char *diff_algo_str = NULL;
9456 
9457 	if (!isatty(STDIN_FILENO))
9458 		errx(1, "standard input is not a tty");
9459 
9460 	setlocale(LC_CTYPE, "");
9461 
9462 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9463 		switch (ch) {
9464 		case 'h':
9465 			hflag = 1;
9466 			break;
9467 		case 'V':
9468 			Vflag = 1;
9469 			break;
9470 		default:
9471 			usage(hflag, 1);
9472 			/* NOTREACHED */
9473 		}
9474 	}
9475 
9476 	argc -= optind;
9477 	argv += optind;
9478 	optind = 1;
9479 	optreset = 1;
9480 
9481 	if (Vflag) {
9482 		got_version_print_str();
9483 		return 0;
9484 	}
9485 
9486 #ifndef PROFILE
9487 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9488 	    NULL) == -1)
9489 		err(1, "pledge");
9490 #endif
9491 
9492 	if (argc == 0) {
9493 		if (hflag)
9494 			usage(hflag, 0);
9495 		/* Build an argument vector which runs a default command. */
9496 		cmd = &tog_commands[0];
9497 		argc = 1;
9498 		cmd_argv = make_argv(argc, cmd->name);
9499 	} else {
9500 		size_t i;
9501 
9502 		/* Did the user specify a command? */
9503 		for (i = 0; i < nitems(tog_commands); i++) {
9504 			if (strncmp(tog_commands[i].name, argv[0],
9505 			    strlen(argv[0])) == 0) {
9506 				cmd = &tog_commands[i];
9507 				break;
9508 			}
9509 		}
9510 	}
9511 
9512 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9513 	if (diff_algo_str) {
9514 		if (strcasecmp(diff_algo_str, "patience") == 0)
9515 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9516 		if (strcasecmp(diff_algo_str, "myers") == 0)
9517 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9518 	}
9519 
9520 	if (cmd == NULL) {
9521 		if (argc != 1)
9522 			usage(0, 1);
9523 		/* No command specified; try log with a path */
9524 		error = tog_log_with_path(argc, argv);
9525 	} else {
9526 		if (hflag)
9527 			cmd->cmd_usage();
9528 		else
9529 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9530 	}
9531 
9532 	endwin();
9533 	if (cmd_argv) {
9534 		int i;
9535 		for (i = 0; i < argc; i++)
9536 			free(cmd_argv[i]);
9537 		free(cmd_argv);
9538 	}
9539 
9540 	if (error && error->code != GOT_ERR_CANCELLED &&
9541 	    error->code != GOT_ERR_EOF &&
9542 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9543 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9544 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9545 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9546 	return 0;
9547 }