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