1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 };
436 
437 struct tog_blame {
438 	FILE *f;
439 	off_t filesize;
440 	struct tog_blame_line *lines;
441 	int nlines;
442 	off_t *line_offsets;
443 	pthread_t thread;
444 	struct tog_blame_thread_args thread_args;
445 	struct tog_blame_cb_args cb_args;
446 	const char *path;
447 	int *pack_fds;
448 };
449 
450 struct tog_blame_view_state {
451 	int first_displayed_line;
452 	int last_displayed_line;
453 	int selected_line;
454 	int last_diffed_line;
455 	int blame_complete;
456 	int eof;
457 	int done;
458 	struct got_object_id_queue blamed_commits;
459 	struct got_object_qid *blamed_commit;
460 	char *path;
461 	struct got_repository *repo;
462 	struct got_object_id *commit_id;
463 	struct got_object_id *id_to_log;
464 	struct tog_blame blame;
465 	int matched_line;
466 	struct tog_colors colors;
467 };
468 
469 struct tog_parent_tree {
470 	TAILQ_ENTRY(tog_parent_tree) entry;
471 	struct got_tree_object *tree;
472 	struct got_tree_entry *first_displayed_entry;
473 	struct got_tree_entry *selected_entry;
474 	int selected;
475 };
476 
477 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
478 
479 struct tog_tree_view_state {
480 	char *tree_label;
481 	struct got_object_id *commit_id;/* commit which this tree belongs to */
482 	struct got_tree_object *root;	/* the commit's root tree entry */
483 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
484 	struct got_tree_entry *first_displayed_entry;
485 	struct got_tree_entry *last_displayed_entry;
486 	struct got_tree_entry *selected_entry;
487 	int ndisplayed, selected, show_ids;
488 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
489 	char *head_ref_name;
490 	struct got_repository *repo;
491 	struct got_tree_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 struct tog_reflist_entry {
496 	TAILQ_ENTRY(tog_reflist_entry) entry;
497 	struct got_reference *ref;
498 	int idx;
499 };
500 
501 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
502 
503 struct tog_ref_view_state {
504 	struct tog_reflist_head refs;
505 	struct tog_reflist_entry *first_displayed_entry;
506 	struct tog_reflist_entry *last_displayed_entry;
507 	struct tog_reflist_entry *selected_entry;
508 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
509 	struct got_repository *repo;
510 	struct tog_reflist_entry *matched_entry;
511 	struct tog_colors colors;
512 };
513 
514 struct tog_help_view_state {
515 	FILE			*f;
516 	off_t			*line_offsets;
517 	size_t			 nlines;
518 	int			 lineno;
519 	int			 first_displayed_line;
520 	int			 last_displayed_line;
521 	int			 eof;
522 	int			 matched_line;
523 	int			 selected_line;
524 	int			 all;
525 	enum tog_keymap_type	 type;
526 };
527 
528 #define GENERATE_HELP \
529 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
530 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
531 	KEY_("k C-p Up", "Move cursor or page up one line"), \
532 	KEY_("j C-n Down", "Move cursor or page down one line"), \
533 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
534 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
535 	KEY_("C-u u", "Scroll the view up one half page"), \
536 	KEY_("C-d d", "Scroll the view down one half page"), \
537 	KEY_("g", "Go to line N (default: first line)"), \
538 	KEY_("Home =", "Go to the first line"), \
539 	KEY_("G", "Go to line N (default: last line)"), \
540 	KEY_("End *", "Go to the last line"), \
541 	KEY_("l Right", "Scroll the view right"), \
542 	KEY_("h Left", "Scroll the view left"), \
543 	KEY_("$", "Scroll view to the rightmost position"), \
544 	KEY_("0", "Scroll view to the leftmost position"), \
545 	KEY_("-", "Decrease size of the focussed split"), \
546 	KEY_("+", "Increase size of the focussed split"), \
547 	KEY_("Tab", "Switch focus between views"), \
548 	KEY_("F", "Toggle fullscreen mode"), \
549 	KEY_("/", "Open prompt to enter search term"), \
550 	KEY_("n", "Find next line/token matching the current search term"), \
551 	KEY_("N", "Find previous line/token matching the current search term"),\
552 	KEY_("q", "Quit the focussed view; Quit help screen"), \
553 	KEY_("Q", "Quit tog"), \
554 	\
555 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
556 	KEY_("< ,", "Move cursor up one commit"), \
557 	KEY_("> .", "Move cursor down one commit"), \
558 	KEY_("Enter", "Open diff view of the selected commit"), \
559 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
560 	KEY_("R", "Open ref view of all repository references"), \
561 	KEY_("T", "Display tree view of the repository from the selected" \
562 	    " commit"), \
563 	KEY_("@", "Toggle between displaying author and committer name"), \
564 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
565 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
566 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
567 	\
568 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
569 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
570 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
571 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
572 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
573 	    " data"), \
574 	KEY_("(", "Go to the previous file in the diff"), \
575 	KEY_(")", "Go to the next file in the diff"), \
576 	KEY_("{", "Go to the previous hunk in the diff"), \
577 	KEY_("}", "Go to the next hunk in the diff"), \
578 	KEY_("[", "Decrease the number of context lines"), \
579 	KEY_("]", "Increase the number of context lines"), \
580 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
581 	\
582 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
583 	KEY_("Enter", "Display diff view of the selected line's commit"), \
584 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
585 	KEY_("L", "Open log view for the currently selected annotated line"), \
586 	KEY_("C", "Reload view with the previously blamed commit"), \
587 	KEY_("c", "Reload view with the version of the file found in the" \
588 	    " selected line's commit"), \
589 	KEY_("p", "Reload view with the version of the file found in the" \
590 	    " selected line's parent commit"), \
591 	\
592 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
593 	KEY_("Enter", "Enter selected directory or open blame view of the" \
594 	    " selected file"), \
595 	KEY_("L", "Open log view for the selected entry"), \
596 	KEY_("R", "Open ref view of all repository references"), \
597 	KEY_("i", "Show object IDs for all tree entries"), \
598 	KEY_("Backspace", "Return to the parent directory"), \
599 	\
600 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
601 	KEY_("Enter", "Display log view of the selected reference"), \
602 	KEY_("T", "Display tree view of the selected reference"), \
603 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
604 	KEY_("m", "Toggle display of last modified date for each reference"), \
605 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
606 	KEY_("C-l", "Reload view with all repository references")
607 
608 struct tog_key_map {
609 	const char		*keys;
610 	const char		*info;
611 	enum tog_keymap_type	 type;
612 };
613 
614 /*
615  * We implement two types of views: parent views and child views.
616  *
617  * The 'Tab' key switches focus between a parent view and its child view.
618  * Child views are shown side-by-side to their parent view, provided
619  * there is enough screen estate.
620  *
621  * When a new view is opened from within a parent view, this new view
622  * becomes a child view of the parent view, replacing any existing child.
623  *
624  * When a new view is opened from within a child view, this new view
625  * becomes a parent view which will obscure the views below until the
626  * user quits the new parent view by typing 'q'.
627  *
628  * This list of views contains parent views only.
629  * Child views are only pointed to by their parent view.
630  */
631 TAILQ_HEAD(tog_view_list_head, tog_view);
632 
633 struct tog_view {
634 	TAILQ_ENTRY(tog_view) entry;
635 	WINDOW *window;
636 	PANEL *panel;
637 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
638 	int resized_y, resized_x; /* begin_y/x based on user resizing */
639 	int maxx, x; /* max column and current start column */
640 	int lines, cols; /* copies of LINES and COLS */
641 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
642 	int gline, hiline; /* navigate to and highlight this nG line */
643 	int ch, count; /* current keymap and count prefix */
644 	int resized; /* set when in a resize event */
645 	int focussed; /* Only set on one parent or child view at a time. */
646 	int dying;
647 	struct tog_view *parent;
648 	struct tog_view *child;
649 
650 	/*
651 	 * This flag is initially set on parent views when a new child view
652 	 * is created. It gets toggled when the 'Tab' key switches focus
653 	 * between parent and child.
654 	 * The flag indicates whether focus should be passed on to our child
655 	 * view if this parent view gets picked for focus after another parent
656 	 * view was closed. This prevents child views from losing focus in such
657 	 * situations.
658 	 */
659 	int focus_child;
660 
661 	enum tog_view_mode mode;
662 	/* type-specific state */
663 	enum tog_view_type type;
664 	union {
665 		struct tog_diff_view_state diff;
666 		struct tog_log_view_state log;
667 		struct tog_blame_view_state blame;
668 		struct tog_tree_view_state tree;
669 		struct tog_ref_view_state ref;
670 		struct tog_help_view_state help;
671 	} state;
672 
673 	const struct got_error *(*show)(struct tog_view *);
674 	const struct got_error *(*input)(struct tog_view **,
675 	    struct tog_view *, int);
676 	const struct got_error *(*reset)(struct tog_view *);
677 	const struct got_error *(*resize)(struct tog_view *, int);
678 	const struct got_error *(*close)(struct tog_view *);
679 
680 	const struct got_error *(*search_start)(struct tog_view *);
681 	const struct got_error *(*search_next)(struct tog_view *);
682 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
683 	    int **, int **, int **, int **);
684 	int search_started;
685 	int searching;
686 #define TOG_SEARCH_FORWARD	1
687 #define TOG_SEARCH_BACKWARD	2
688 	int search_next_done;
689 #define TOG_SEARCH_HAVE_MORE	1
690 #define TOG_SEARCH_NO_MORE	2
691 #define TOG_SEARCH_HAVE_NONE	3
692 	regex_t regex;
693 	regmatch_t regmatch;
694 	const char *action;
695 };
696 
697 static const struct got_error *open_diff_view(struct tog_view *,
698     struct got_object_id *, struct got_object_id *,
699     const char *, const char *, int, int, int, struct tog_view *,
700     struct got_repository *);
701 static const struct got_error *show_diff_view(struct tog_view *);
702 static const struct got_error *input_diff_view(struct tog_view **,
703     struct tog_view *, int);
704 static const struct got_error *reset_diff_view(struct tog_view *);
705 static const struct got_error* close_diff_view(struct tog_view *);
706 static const struct got_error *search_start_diff_view(struct tog_view *);
707 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
708     size_t *, int **, int **, int **, int **);
709 static const struct got_error *search_next_view_match(struct tog_view *);
710 
711 static const struct got_error *open_log_view(struct tog_view *,
712     struct got_object_id *, struct got_repository *,
713     const char *, const char *, int);
714 static const struct got_error * show_log_view(struct tog_view *);
715 static const struct got_error *input_log_view(struct tog_view **,
716     struct tog_view *, int);
717 static const struct got_error *resize_log_view(struct tog_view *, int);
718 static const struct got_error *close_log_view(struct tog_view *);
719 static const struct got_error *search_start_log_view(struct tog_view *);
720 static const struct got_error *search_next_log_view(struct tog_view *);
721 
722 static const struct got_error *open_blame_view(struct tog_view *, char *,
723     struct got_object_id *, struct got_repository *);
724 static const struct got_error *show_blame_view(struct tog_view *);
725 static const struct got_error *input_blame_view(struct tog_view **,
726     struct tog_view *, int);
727 static const struct got_error *reset_blame_view(struct tog_view *);
728 static const struct got_error *close_blame_view(struct tog_view *);
729 static const struct got_error *search_start_blame_view(struct tog_view *);
730 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
731     size_t *, int **, int **, int **, int **);
732 
733 static const struct got_error *open_tree_view(struct tog_view *,
734     struct got_object_id *, const char *, struct got_repository *);
735 static const struct got_error *show_tree_view(struct tog_view *);
736 static const struct got_error *input_tree_view(struct tog_view **,
737     struct tog_view *, int);
738 static const struct got_error *close_tree_view(struct tog_view *);
739 static const struct got_error *search_start_tree_view(struct tog_view *);
740 static const struct got_error *search_next_tree_view(struct tog_view *);
741 
742 static const struct got_error *open_ref_view(struct tog_view *,
743     struct got_repository *);
744 static const struct got_error *show_ref_view(struct tog_view *);
745 static const struct got_error *input_ref_view(struct tog_view **,
746     struct tog_view *, int);
747 static const struct got_error *close_ref_view(struct tog_view *);
748 static const struct got_error *search_start_ref_view(struct tog_view *);
749 static const struct got_error *search_next_ref_view(struct tog_view *);
750 
751 static const struct got_error *open_help_view(struct tog_view *,
752     struct tog_view *);
753 static const struct got_error *show_help_view(struct tog_view *);
754 static const struct got_error *input_help_view(struct tog_view **,
755     struct tog_view *, int);
756 static const struct got_error *reset_help_view(struct tog_view *);
757 static const struct got_error* close_help_view(struct tog_view *);
758 static const struct got_error *search_start_help_view(struct tog_view *);
759 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
760     size_t *, int **, int **, int **, int **);
761 
762 static volatile sig_atomic_t tog_sigwinch_received;
763 static volatile sig_atomic_t tog_sigpipe_received;
764 static volatile sig_atomic_t tog_sigcont_received;
765 static volatile sig_atomic_t tog_sigint_received;
766 static volatile sig_atomic_t tog_sigterm_received;
767 
768 static void
769 tog_sigwinch(int signo)
770 {
771 	tog_sigwinch_received = 1;
772 }
773 
774 static void
775 tog_sigpipe(int signo)
776 {
777 	tog_sigpipe_received = 1;
778 }
779 
780 static void
781 tog_sigcont(int signo)
782 {
783 	tog_sigcont_received = 1;
784 }
785 
786 static void
787 tog_sigint(int signo)
788 {
789 	tog_sigint_received = 1;
790 }
791 
792 static void
793 tog_sigterm(int signo)
794 {
795 	tog_sigterm_received = 1;
796 }
797 
798 static int
799 tog_fatal_signal_received(void)
800 {
801 	return (tog_sigpipe_received ||
802 	    tog_sigint_received || tog_sigterm_received);
803 }
804 
805 static const struct got_error *
806 view_close(struct tog_view *view)
807 {
808 	const struct got_error *err = NULL, *child_err = NULL;
809 
810 	if (view->child) {
811 		child_err = view_close(view->child);
812 		view->child = NULL;
813 	}
814 	if (view->close)
815 		err = view->close(view);
816 	if (view->panel)
817 		del_panel(view->panel);
818 	if (view->window)
819 		delwin(view->window);
820 	free(view);
821 	return err ? err : child_err;
822 }
823 
824 static struct tog_view *
825 view_open(int nlines, int ncols, int begin_y, int begin_x,
826     enum tog_view_type type)
827 {
828 	struct tog_view *view = calloc(1, sizeof(*view));
829 
830 	if (view == NULL)
831 		return NULL;
832 
833 	view->type = type;
834 	view->lines = LINES;
835 	view->cols = COLS;
836 	view->nlines = nlines ? nlines : LINES - begin_y;
837 	view->ncols = ncols ? ncols : COLS - begin_x;
838 	view->begin_y = begin_y;
839 	view->begin_x = begin_x;
840 	view->window = newwin(nlines, ncols, begin_y, begin_x);
841 	if (view->window == NULL) {
842 		view_close(view);
843 		return NULL;
844 	}
845 	view->panel = new_panel(view->window);
846 	if (view->panel == NULL ||
847 	    set_panel_userptr(view->panel, view) != OK) {
848 		view_close(view);
849 		return NULL;
850 	}
851 
852 	keypad(view->window, TRUE);
853 	return view;
854 }
855 
856 static int
857 view_split_begin_x(int begin_x)
858 {
859 	if (begin_x > 0 || COLS < 120)
860 		return 0;
861 	return (COLS - MAX(COLS / 2, 80));
862 }
863 
864 /* XXX Stub till we decide what to do. */
865 static int
866 view_split_begin_y(int lines)
867 {
868 	return lines * HSPLIT_SCALE;
869 }
870 
871 static const struct got_error *view_resize(struct tog_view *);
872 
873 static const struct got_error *
874 view_splitscreen(struct tog_view *view)
875 {
876 	const struct got_error *err = NULL;
877 
878 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
879 		if (view->resized_y && view->resized_y < view->lines)
880 			view->begin_y = view->resized_y;
881 		else
882 			view->begin_y = view_split_begin_y(view->nlines);
883 		view->begin_x = 0;
884 	} else if (!view->resized) {
885 		if (view->resized_x && view->resized_x < view->cols - 1 &&
886 		    view->cols > 119)
887 			view->begin_x = view->resized_x;
888 		else
889 			view->begin_x = view_split_begin_x(0);
890 		view->begin_y = 0;
891 	}
892 	view->nlines = LINES - view->begin_y;
893 	view->ncols = COLS - view->begin_x;
894 	view->lines = LINES;
895 	view->cols = COLS;
896 	err = view_resize(view);
897 	if (err)
898 		return err;
899 
900 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
901 		view->parent->nlines = view->begin_y;
902 
903 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
904 		return got_error_from_errno("mvwin");
905 
906 	return NULL;
907 }
908 
909 static const struct got_error *
910 view_fullscreen(struct tog_view *view)
911 {
912 	const struct got_error *err = NULL;
913 
914 	view->begin_x = 0;
915 	view->begin_y = view->resized ? view->begin_y : 0;
916 	view->nlines = view->resized ? view->nlines : LINES;
917 	view->ncols = COLS;
918 	view->lines = LINES;
919 	view->cols = COLS;
920 	err = view_resize(view);
921 	if (err)
922 		return err;
923 
924 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
925 		return got_error_from_errno("mvwin");
926 
927 	return NULL;
928 }
929 
930 static int
931 view_is_parent_view(struct tog_view *view)
932 {
933 	return view->parent == NULL;
934 }
935 
936 static int
937 view_is_splitscreen(struct tog_view *view)
938 {
939 	return view->begin_x > 0 || view->begin_y > 0;
940 }
941 
942 static int
943 view_is_fullscreen(struct tog_view *view)
944 {
945 	return view->nlines == LINES && view->ncols == COLS;
946 }
947 
948 static int
949 view_is_hsplit_top(struct tog_view *view)
950 {
951 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
952 	    view_is_splitscreen(view->child);
953 }
954 
955 static void
956 view_border(struct tog_view *view)
957 {
958 	PANEL *panel;
959 	const struct tog_view *view_above;
960 
961 	if (view->parent)
962 		return view_border(view->parent);
963 
964 	panel = panel_above(view->panel);
965 	if (panel == NULL)
966 		return;
967 
968 	view_above = panel_userptr(panel);
969 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
970 		mvwhline(view->window, view_above->begin_y - 1,
971 		    view->begin_x, got_locale_is_utf8() ?
972 		    ACS_HLINE : '-', view->ncols);
973 	else
974 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
975 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
976 }
977 
978 static const struct got_error *view_init_hsplit(struct tog_view *, int);
979 static const struct got_error *request_log_commits(struct tog_view *);
980 static const struct got_error *offset_selection_down(struct tog_view *);
981 static void offset_selection_up(struct tog_view *);
982 static void view_get_split(struct tog_view *, int *, int *);
983 
984 static const struct got_error *
985 view_resize(struct tog_view *view)
986 {
987 	const struct got_error	*err = NULL;
988 	int			 dif, nlines, ncols;
989 
990 	dif = LINES - view->lines;  /* line difference */
991 
992 	if (view->lines > LINES)
993 		nlines = view->nlines - (view->lines - LINES);
994 	else
995 		nlines = view->nlines + (LINES - view->lines);
996 	if (view->cols > COLS)
997 		ncols = view->ncols - (view->cols - COLS);
998 	else
999 		ncols = view->ncols + (COLS - view->cols);
1000 
1001 	if (view->child) {
1002 		int hs = view->child->begin_y;
1003 
1004 		if (!view_is_fullscreen(view))
1005 			view->child->begin_x = view_split_begin_x(view->begin_x);
1006 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1007 		    view->child->begin_x == 0) {
1008 			ncols = COLS;
1009 
1010 			view_fullscreen(view->child);
1011 			if (view->child->focussed)
1012 				show_panel(view->child->panel);
1013 			else
1014 				show_panel(view->panel);
1015 		} else {
1016 			ncols = view->child->begin_x;
1017 
1018 			view_splitscreen(view->child);
1019 			show_panel(view->child->panel);
1020 		}
1021 		/*
1022 		 * XXX This is ugly and needs to be moved into the above
1023 		 * logic but "works" for now and my attempts at moving it
1024 		 * break either 'tab' or 'F' key maps in horizontal splits.
1025 		 */
1026 		if (hs) {
1027 			err = view_splitscreen(view->child);
1028 			if (err)
1029 				return err;
1030 			if (dif < 0) { /* top split decreased */
1031 				err = offset_selection_down(view);
1032 				if (err)
1033 					return err;
1034 			}
1035 			view_border(view);
1036 			update_panels();
1037 			doupdate();
1038 			show_panel(view->child->panel);
1039 			nlines = view->nlines;
1040 		}
1041 	} else if (view->parent == NULL)
1042 		ncols = COLS;
1043 
1044 	if (view->resize && dif > 0) {
1045 		err = view->resize(view, dif);
1046 		if (err)
1047 			return err;
1048 	}
1049 
1050 	if (wresize(view->window, nlines, ncols) == ERR)
1051 		return got_error_from_errno("wresize");
1052 	if (replace_panel(view->panel, view->window) == ERR)
1053 		return got_error_from_errno("replace_panel");
1054 	wclear(view->window);
1055 
1056 	view->nlines = nlines;
1057 	view->ncols = ncols;
1058 	view->lines = LINES;
1059 	view->cols = COLS;
1060 
1061 	return NULL;
1062 }
1063 
1064 static const struct got_error *
1065 resize_log_view(struct tog_view *view, int increase)
1066 {
1067 	struct tog_log_view_state	*s = &view->state.log;
1068 	const struct got_error		*err = NULL;
1069 	int				 n = 0;
1070 
1071 	if (s->selected_entry)
1072 		n = s->selected_entry->idx + view->lines - s->selected;
1073 
1074 	/*
1075 	 * Request commits to account for the increased
1076 	 * height so we have enough to populate the view.
1077 	 */
1078 	if (s->commits->ncommits < n) {
1079 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1080 		err = request_log_commits(view);
1081 	}
1082 
1083 	return err;
1084 }
1085 
1086 static void
1087 view_adjust_offset(struct tog_view *view, int n)
1088 {
1089 	if (n == 0)
1090 		return;
1091 
1092 	if (view->parent && view->parent->offset) {
1093 		if (view->parent->offset + n >= 0)
1094 			view->parent->offset += n;
1095 		else
1096 			view->parent->offset = 0;
1097 	} else if (view->offset) {
1098 		if (view->offset - n >= 0)
1099 			view->offset -= n;
1100 		else
1101 			view->offset = 0;
1102 	}
1103 }
1104 
1105 static const struct got_error *
1106 view_resize_split(struct tog_view *view, int resize)
1107 {
1108 	const struct got_error	*err = NULL;
1109 	struct tog_view		*v = NULL;
1110 
1111 	if (view->parent)
1112 		v = view->parent;
1113 	else
1114 		v = view;
1115 
1116 	if (!v->child || !view_is_splitscreen(v->child))
1117 		return NULL;
1118 
1119 	v->resized = v->child->resized = resize;  /* lock for resize event */
1120 
1121 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1122 		if (v->child->resized_y)
1123 			v->child->begin_y = v->child->resized_y;
1124 		if (view->parent)
1125 			v->child->begin_y -= resize;
1126 		else
1127 			v->child->begin_y += resize;
1128 		if (v->child->begin_y < 3) {
1129 			view->count = 0;
1130 			v->child->begin_y = 3;
1131 		} else if (v->child->begin_y > LINES - 1) {
1132 			view->count = 0;
1133 			v->child->begin_y = LINES - 1;
1134 		}
1135 		v->ncols = COLS;
1136 		v->child->ncols = COLS;
1137 		view_adjust_offset(view, resize);
1138 		err = view_init_hsplit(v, v->child->begin_y);
1139 		if (err)
1140 			return err;
1141 		v->child->resized_y = v->child->begin_y;
1142 	} else {
1143 		if (v->child->resized_x)
1144 			v->child->begin_x = v->child->resized_x;
1145 		if (view->parent)
1146 			v->child->begin_x -= resize;
1147 		else
1148 			v->child->begin_x += resize;
1149 		if (v->child->begin_x < 11) {
1150 			view->count = 0;
1151 			v->child->begin_x = 11;
1152 		} else if (v->child->begin_x > COLS - 1) {
1153 			view->count = 0;
1154 			v->child->begin_x = COLS - 1;
1155 		}
1156 		v->child->resized_x = v->child->begin_x;
1157 	}
1158 
1159 	v->child->mode = v->mode;
1160 	v->child->nlines = v->lines - v->child->begin_y;
1161 	v->child->ncols = v->cols - v->child->begin_x;
1162 	v->focus_child = 1;
1163 
1164 	err = view_fullscreen(v);
1165 	if (err)
1166 		return err;
1167 	err = view_splitscreen(v->child);
1168 	if (err)
1169 		return err;
1170 
1171 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1172 		err = offset_selection_down(v->child);
1173 		if (err)
1174 			return err;
1175 	}
1176 
1177 	if (v->resize)
1178 		err = v->resize(v, 0);
1179 	else if (v->child->resize)
1180 		err = v->child->resize(v->child, 0);
1181 
1182 	v->resized = v->child->resized = 0;
1183 
1184 	return err;
1185 }
1186 
1187 static void
1188 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1189 {
1190 	struct tog_view *v = src->child ? src->child : src;
1191 
1192 	dst->resized_x = v->resized_x;
1193 	dst->resized_y = v->resized_y;
1194 }
1195 
1196 static const struct got_error *
1197 view_close_child(struct tog_view *view)
1198 {
1199 	const struct got_error *err = NULL;
1200 
1201 	if (view->child == NULL)
1202 		return NULL;
1203 
1204 	err = view_close(view->child);
1205 	view->child = NULL;
1206 	return err;
1207 }
1208 
1209 static const struct got_error *
1210 view_set_child(struct tog_view *view, struct tog_view *child)
1211 {
1212 	const struct got_error *err = NULL;
1213 
1214 	view->child = child;
1215 	child->parent = view;
1216 
1217 	err = view_resize(view);
1218 	if (err)
1219 		return err;
1220 
1221 	if (view->child->resized_x || view->child->resized_y)
1222 		err = view_resize_split(view, 0);
1223 
1224 	return err;
1225 }
1226 
1227 static const struct got_error *view_dispatch_request(struct tog_view **,
1228     struct tog_view *, enum tog_view_type, int, int);
1229 
1230 static const struct got_error *
1231 view_request_new(struct tog_view **requested, struct tog_view *view,
1232     enum tog_view_type request)
1233 {
1234 	struct tog_view		*new_view = NULL;
1235 	const struct got_error	*err;
1236 	int			 y = 0, x = 0;
1237 
1238 	*requested = NULL;
1239 
1240 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1241 		view_get_split(view, &y, &x);
1242 
1243 	err = view_dispatch_request(&new_view, view, request, y, x);
1244 	if (err)
1245 		return err;
1246 
1247 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1248 	    request != TOG_VIEW_HELP) {
1249 		err = view_init_hsplit(view, y);
1250 		if (err)
1251 			return err;
1252 	}
1253 
1254 	view->focussed = 0;
1255 	new_view->focussed = 1;
1256 	new_view->mode = view->mode;
1257 	new_view->nlines = request == TOG_VIEW_HELP ?
1258 	    view->lines : view->lines - y;
1259 
1260 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1261 		view_transfer_size(new_view, view);
1262 		err = view_close_child(view);
1263 		if (err)
1264 			return err;
1265 		err = view_set_child(view, new_view);
1266 		if (err)
1267 			return err;
1268 		view->focus_child = 1;
1269 	} else
1270 		*requested = new_view;
1271 
1272 	return NULL;
1273 }
1274 
1275 static void
1276 tog_resizeterm(void)
1277 {
1278 	int cols, lines;
1279 	struct winsize size;
1280 
1281 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1282 		cols = 80;     /* Default */
1283 		lines = 24;
1284 	} else {
1285 		cols = size.ws_col;
1286 		lines = size.ws_row;
1287 	}
1288 	resize_term(lines, cols);
1289 }
1290 
1291 static const struct got_error *
1292 view_search_start(struct tog_view *view, int fast_refresh)
1293 {
1294 	const struct got_error *err = NULL;
1295 	struct tog_view *v = view;
1296 	char pattern[1024];
1297 	int ret;
1298 
1299 	if (view->search_started) {
1300 		regfree(&view->regex);
1301 		view->searching = 0;
1302 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1303 	}
1304 	view->search_started = 0;
1305 
1306 	if (view->nlines < 1)
1307 		return NULL;
1308 
1309 	if (view_is_hsplit_top(view))
1310 		v = view->child;
1311 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1312 		v = view->parent;
1313 
1314 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1315 	wclrtoeol(v->window);
1316 
1317 	nodelay(v->window, FALSE);  /* block for search term input */
1318 	nocbreak();
1319 	echo();
1320 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1321 	wrefresh(v->window);
1322 	cbreak();
1323 	noecho();
1324 	nodelay(v->window, TRUE);
1325 	if (!fast_refresh)
1326 		halfdelay(10);
1327 	if (ret == ERR)
1328 		return NULL;
1329 
1330 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1331 		err = view->search_start(view);
1332 		if (err) {
1333 			regfree(&view->regex);
1334 			return err;
1335 		}
1336 		view->search_started = 1;
1337 		view->searching = TOG_SEARCH_FORWARD;
1338 		view->search_next_done = 0;
1339 		view->search_next(view);
1340 	}
1341 
1342 	return NULL;
1343 }
1344 
1345 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1346 static const struct got_error *
1347 switch_split(struct tog_view *view)
1348 {
1349 	const struct got_error	*err = NULL;
1350 	struct tog_view		*v = NULL;
1351 
1352 	if (view->parent)
1353 		v = view->parent;
1354 	else
1355 		v = view;
1356 
1357 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1358 		v->mode = TOG_VIEW_SPLIT_VERT;
1359 	else
1360 		v->mode = TOG_VIEW_SPLIT_HRZN;
1361 
1362 	if (!v->child)
1363 		return NULL;
1364 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1365 		v->mode = TOG_VIEW_SPLIT_NONE;
1366 
1367 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1368 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1369 		v->child->begin_y = v->child->resized_y;
1370 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1371 		v->child->begin_x = v->child->resized_x;
1372 
1373 
1374 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1375 		v->ncols = COLS;
1376 		v->child->ncols = COLS;
1377 		v->child->nscrolled = LINES - v->child->nlines;
1378 
1379 		err = view_init_hsplit(v, v->child->begin_y);
1380 		if (err)
1381 			return err;
1382 	}
1383 	v->child->mode = v->mode;
1384 	v->child->nlines = v->lines - v->child->begin_y;
1385 	v->focus_child = 1;
1386 
1387 	err = view_fullscreen(v);
1388 	if (err)
1389 		return err;
1390 	err = view_splitscreen(v->child);
1391 	if (err)
1392 		return err;
1393 
1394 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1395 		v->mode = TOG_VIEW_SPLIT_VERT;
1396 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1397 		err = offset_selection_down(v);
1398 		if (err)
1399 			return err;
1400 		err = offset_selection_down(v->child);
1401 		if (err)
1402 			return err;
1403 	} else {
1404 		offset_selection_up(v);
1405 		offset_selection_up(v->child);
1406 	}
1407 	if (v->resize)
1408 		err = v->resize(v, 0);
1409 	else if (v->child->resize)
1410 		err = v->child->resize(v->child, 0);
1411 
1412 	return err;
1413 }
1414 
1415 /*
1416  * Compute view->count from numeric input. Assign total to view->count and
1417  * return first non-numeric key entered.
1418  */
1419 static int
1420 get_compound_key(struct tog_view *view, int c)
1421 {
1422 	struct tog_view	*v = view;
1423 	int		 x, n = 0;
1424 
1425 	if (view_is_hsplit_top(view))
1426 		v = view->child;
1427 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1428 		v = view->parent;
1429 
1430 	view->count = 0;
1431 	cbreak();  /* block for input */
1432 	nodelay(view->window, FALSE);
1433 	wmove(v->window, v->nlines - 1, 0);
1434 	wclrtoeol(v->window);
1435 	waddch(v->window, ':');
1436 
1437 	do {
1438 		x = getcurx(v->window);
1439 		if (x != ERR && x < view->ncols) {
1440 			waddch(v->window, c);
1441 			wrefresh(v->window);
1442 		}
1443 
1444 		/*
1445 		 * Don't overflow. Max valid request should be the greatest
1446 		 * between the longest and total lines; cap at 10 million.
1447 		 */
1448 		if (n >= 9999999)
1449 			n = 9999999;
1450 		else
1451 			n = n * 10 + (c - '0');
1452 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1453 
1454 	if (c == 'G' || c == 'g') {	/* nG key map */
1455 		view->gline = view->hiline = n;
1456 		n = 0;
1457 		c = 0;
1458 	}
1459 
1460 	/* Massage excessive or inapplicable values at the input handler. */
1461 	view->count = n;
1462 
1463 	return c;
1464 }
1465 
1466 static void
1467 action_report(struct tog_view *view)
1468 {
1469 	struct tog_view *v = view;
1470 
1471 	if (view_is_hsplit_top(view))
1472 		v = view->child;
1473 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1474 		v = view->parent;
1475 
1476 	wmove(v->window, v->nlines - 1, 0);
1477 	wclrtoeol(v->window);
1478 	wprintw(v->window, ":%s", view->action);
1479 	wrefresh(v->window);
1480 
1481 	/*
1482 	 * Clear action status report. Only clear in blame view
1483 	 * once annotating is complete, otherwise it's too fast.
1484 	 */
1485 	if (view->type == TOG_VIEW_BLAME) {
1486 		if (view->state.blame.blame_complete)
1487 			view->action = NULL;
1488 	} else
1489 		view->action = NULL;
1490 }
1491 
1492 static const struct got_error *
1493 view_input(struct tog_view **new, int *done, struct tog_view *view,
1494     struct tog_view_list_head *views, int fast_refresh)
1495 {
1496 	const struct got_error *err = NULL;
1497 	struct tog_view *v;
1498 	int ch, errcode;
1499 
1500 	*new = NULL;
1501 
1502 	if (view->action)
1503 		action_report(view);
1504 
1505 	/* Clear "no matches" indicator. */
1506 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1507 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1508 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1509 		view->count = 0;
1510 	}
1511 
1512 	if (view->searching && !view->search_next_done) {
1513 		errcode = pthread_mutex_unlock(&tog_mutex);
1514 		if (errcode)
1515 			return got_error_set_errno(errcode,
1516 			    "pthread_mutex_unlock");
1517 		sched_yield();
1518 		errcode = pthread_mutex_lock(&tog_mutex);
1519 		if (errcode)
1520 			return got_error_set_errno(errcode,
1521 			    "pthread_mutex_lock");
1522 		view->search_next(view);
1523 		return NULL;
1524 	}
1525 
1526 	/* Allow threads to make progress while we are waiting for input. */
1527 	errcode = pthread_mutex_unlock(&tog_mutex);
1528 	if (errcode)
1529 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1530 	/* If we have an unfinished count, let C-g or backspace abort. */
1531 	if (view->count && --view->count) {
1532 		cbreak();
1533 		nodelay(view->window, TRUE);
1534 		ch = wgetch(view->window);
1535 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1536 			view->count = 0;
1537 		else
1538 			ch = view->ch;
1539 	} else {
1540 		ch = wgetch(view->window);
1541 		if (ch >= '1' && ch  <= '9')
1542 			view->ch = ch = get_compound_key(view, ch);
1543 	}
1544 	if (view->hiline && ch != ERR && ch != 0)
1545 		view->hiline = 0;  /* key pressed, clear line highlight */
1546 	nodelay(view->window, TRUE);
1547 	errcode = pthread_mutex_lock(&tog_mutex);
1548 	if (errcode)
1549 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1550 
1551 	if (tog_sigwinch_received || tog_sigcont_received) {
1552 		tog_resizeterm();
1553 		tog_sigwinch_received = 0;
1554 		tog_sigcont_received = 0;
1555 		TAILQ_FOREACH(v, views, entry) {
1556 			err = view_resize(v);
1557 			if (err)
1558 				return err;
1559 			err = v->input(new, v, KEY_RESIZE);
1560 			if (err)
1561 				return err;
1562 			if (v->child) {
1563 				err = view_resize(v->child);
1564 				if (err)
1565 					return err;
1566 				err = v->child->input(new, v->child,
1567 				    KEY_RESIZE);
1568 				if (err)
1569 					return err;
1570 				if (v->child->resized_x || v->child->resized_y) {
1571 					err = view_resize_split(v, 0);
1572 					if (err)
1573 						return err;
1574 				}
1575 			}
1576 		}
1577 	}
1578 
1579 	switch (ch) {
1580 	case '?':
1581 	case 'H':
1582 	case KEY_F(1):
1583 		if (view->type == TOG_VIEW_HELP)
1584 			err = view->reset(view);
1585 		else
1586 			err = view_request_new(new, view, TOG_VIEW_HELP);
1587 		break;
1588 	case '\t':
1589 		view->count = 0;
1590 		if (view->child) {
1591 			view->focussed = 0;
1592 			view->child->focussed = 1;
1593 			view->focus_child = 1;
1594 		} else if (view->parent) {
1595 			view->focussed = 0;
1596 			view->parent->focussed = 1;
1597 			view->parent->focus_child = 0;
1598 			if (!view_is_splitscreen(view)) {
1599 				if (view->parent->resize) {
1600 					err = view->parent->resize(view->parent,
1601 					    0);
1602 					if (err)
1603 						return err;
1604 				}
1605 				offset_selection_up(view->parent);
1606 				err = view_fullscreen(view->parent);
1607 				if (err)
1608 					return err;
1609 			}
1610 		}
1611 		break;
1612 	case 'q':
1613 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1614 			if (view->parent->resize) {
1615 				/* might need more commits to fill fullscreen */
1616 				err = view->parent->resize(view->parent, 0);
1617 				if (err)
1618 					break;
1619 			}
1620 			offset_selection_up(view->parent);
1621 		}
1622 		err = view->input(new, view, ch);
1623 		view->dying = 1;
1624 		break;
1625 	case 'Q':
1626 		*done = 1;
1627 		break;
1628 	case 'F':
1629 		view->count = 0;
1630 		if (view_is_parent_view(view)) {
1631 			if (view->child == NULL)
1632 				break;
1633 			if (view_is_splitscreen(view->child)) {
1634 				view->focussed = 0;
1635 				view->child->focussed = 1;
1636 				err = view_fullscreen(view->child);
1637 			} else {
1638 				err = view_splitscreen(view->child);
1639 				if (!err)
1640 					err = view_resize_split(view, 0);
1641 			}
1642 			if (err)
1643 				break;
1644 			err = view->child->input(new, view->child,
1645 			    KEY_RESIZE);
1646 		} else {
1647 			if (view_is_splitscreen(view)) {
1648 				view->parent->focussed = 0;
1649 				view->focussed = 1;
1650 				err = view_fullscreen(view);
1651 			} else {
1652 				err = view_splitscreen(view);
1653 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1654 					err = view_resize(view->parent);
1655 				if (!err)
1656 					err = view_resize_split(view, 0);
1657 			}
1658 			if (err)
1659 				break;
1660 			err = view->input(new, view, KEY_RESIZE);
1661 		}
1662 		if (err)
1663 			break;
1664 		if (view->resize) {
1665 			err = view->resize(view, 0);
1666 			if (err)
1667 				break;
1668 		}
1669 		if (view->parent)
1670 			err = offset_selection_down(view->parent);
1671 		if (!err)
1672 			err = offset_selection_down(view);
1673 		break;
1674 	case 'S':
1675 		view->count = 0;
1676 		err = switch_split(view);
1677 		break;
1678 	case '-':
1679 		err = view_resize_split(view, -1);
1680 		break;
1681 	case '+':
1682 		err = view_resize_split(view, 1);
1683 		break;
1684 	case KEY_RESIZE:
1685 		break;
1686 	case '/':
1687 		view->count = 0;
1688 		if (view->search_start)
1689 			view_search_start(view, fast_refresh);
1690 		else
1691 			err = view->input(new, view, ch);
1692 		break;
1693 	case 'N':
1694 	case 'n':
1695 		if (view->search_started && view->search_next) {
1696 			view->searching = (ch == 'n' ?
1697 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1698 			view->search_next_done = 0;
1699 			view->search_next(view);
1700 		} else
1701 			err = view->input(new, view, ch);
1702 		break;
1703 	case 'A':
1704 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1705 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1706 			view->action = "Patience diff algorithm";
1707 		} else {
1708 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1709 			view->action = "Myers diff algorithm";
1710 		}
1711 		TAILQ_FOREACH(v, views, entry) {
1712 			if (v->reset) {
1713 				err = v->reset(v);
1714 				if (err)
1715 					return err;
1716 			}
1717 			if (v->child && v->child->reset) {
1718 				err = v->child->reset(v->child);
1719 				if (err)
1720 					return err;
1721 			}
1722 		}
1723 		break;
1724 	default:
1725 		err = view->input(new, view, ch);
1726 		break;
1727 	}
1728 
1729 	return err;
1730 }
1731 
1732 static int
1733 view_needs_focus_indication(struct tog_view *view)
1734 {
1735 	if (view_is_parent_view(view)) {
1736 		if (view->child == NULL || view->child->focussed)
1737 			return 0;
1738 		if (!view_is_splitscreen(view->child))
1739 			return 0;
1740 	} else if (!view_is_splitscreen(view))
1741 		return 0;
1742 
1743 	return view->focussed;
1744 }
1745 
1746 static const struct got_error *
1747 view_loop(struct tog_view *view)
1748 {
1749 	const struct got_error *err = NULL;
1750 	struct tog_view_list_head views;
1751 	struct tog_view *new_view;
1752 	char *mode;
1753 	int fast_refresh = 10;
1754 	int done = 0, errcode;
1755 
1756 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1757 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1758 		view->mode = TOG_VIEW_SPLIT_VERT;
1759 	else
1760 		view->mode = TOG_VIEW_SPLIT_HRZN;
1761 
1762 	errcode = pthread_mutex_lock(&tog_mutex);
1763 	if (errcode)
1764 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1765 
1766 	TAILQ_INIT(&views);
1767 	TAILQ_INSERT_HEAD(&views, view, entry);
1768 
1769 	view->focussed = 1;
1770 	err = view->show(view);
1771 	if (err)
1772 		return err;
1773 	update_panels();
1774 	doupdate();
1775 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1776 	    !tog_fatal_signal_received()) {
1777 		/* Refresh fast during initialization, then become slower. */
1778 		if (fast_refresh && --fast_refresh == 0)
1779 			halfdelay(10); /* switch to once per second */
1780 
1781 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1782 		if (err)
1783 			break;
1784 
1785 		if (view->dying && view == TAILQ_FIRST(&views) &&
1786 		    TAILQ_NEXT(view, entry) == NULL)
1787 			done = 1;
1788 		if (done) {
1789 			struct tog_view *v;
1790 
1791 			/*
1792 			 * When we quit, scroll the screen up a single line
1793 			 * so we don't lose any information.
1794 			 */
1795 			TAILQ_FOREACH(v, &views, entry) {
1796 				wmove(v->window, 0, 0);
1797 				wdeleteln(v->window);
1798 				wnoutrefresh(v->window);
1799 				if (v->child && !view_is_fullscreen(v)) {
1800 					wmove(v->child->window, 0, 0);
1801 					wdeleteln(v->child->window);
1802 					wnoutrefresh(v->child->window);
1803 				}
1804 			}
1805 			doupdate();
1806 		}
1807 
1808 		if (view->dying) {
1809 			struct tog_view *v, *prev = NULL;
1810 
1811 			if (view_is_parent_view(view))
1812 				prev = TAILQ_PREV(view, tog_view_list_head,
1813 				    entry);
1814 			else if (view->parent)
1815 				prev = view->parent;
1816 
1817 			if (view->parent) {
1818 				view->parent->child = NULL;
1819 				view->parent->focus_child = 0;
1820 				/* Restore fullscreen line height. */
1821 				view->parent->nlines = view->parent->lines;
1822 				err = view_resize(view->parent);
1823 				if (err)
1824 					break;
1825 				/* Make resized splits persist. */
1826 				view_transfer_size(view->parent, view);
1827 			} else
1828 				TAILQ_REMOVE(&views, view, entry);
1829 
1830 			err = view_close(view);
1831 			if (err)
1832 				goto done;
1833 
1834 			view = NULL;
1835 			TAILQ_FOREACH(v, &views, entry) {
1836 				if (v->focussed)
1837 					break;
1838 			}
1839 			if (view == NULL && new_view == NULL) {
1840 				/* No view has focus. Try to pick one. */
1841 				if (prev)
1842 					view = prev;
1843 				else if (!TAILQ_EMPTY(&views)) {
1844 					view = TAILQ_LAST(&views,
1845 					    tog_view_list_head);
1846 				}
1847 				if (view) {
1848 					if (view->focus_child) {
1849 						view->child->focussed = 1;
1850 						view = view->child;
1851 					} else
1852 						view->focussed = 1;
1853 				}
1854 			}
1855 		}
1856 		if (new_view) {
1857 			struct tog_view *v, *t;
1858 			/* Only allow one parent view per type. */
1859 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1860 				if (v->type != new_view->type)
1861 					continue;
1862 				TAILQ_REMOVE(&views, v, entry);
1863 				err = view_close(v);
1864 				if (err)
1865 					goto done;
1866 				break;
1867 			}
1868 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1869 			view = new_view;
1870 		}
1871 		if (view && !done) {
1872 			if (view_is_parent_view(view)) {
1873 				if (view->child && view->child->focussed)
1874 					view = view->child;
1875 			} else {
1876 				if (view->parent && view->parent->focussed)
1877 					view = view->parent;
1878 			}
1879 			show_panel(view->panel);
1880 			if (view->child && view_is_splitscreen(view->child))
1881 				show_panel(view->child->panel);
1882 			if (view->parent && view_is_splitscreen(view)) {
1883 				err = view->parent->show(view->parent);
1884 				if (err)
1885 					goto done;
1886 			}
1887 			err = view->show(view);
1888 			if (err)
1889 				goto done;
1890 			if (view->child) {
1891 				err = view->child->show(view->child);
1892 				if (err)
1893 					goto done;
1894 			}
1895 			update_panels();
1896 			doupdate();
1897 		}
1898 	}
1899 done:
1900 	while (!TAILQ_EMPTY(&views)) {
1901 		const struct got_error *close_err;
1902 		view = TAILQ_FIRST(&views);
1903 		TAILQ_REMOVE(&views, view, entry);
1904 		close_err = view_close(view);
1905 		if (close_err && err == NULL)
1906 			err = close_err;
1907 	}
1908 
1909 	errcode = pthread_mutex_unlock(&tog_mutex);
1910 	if (errcode && err == NULL)
1911 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1912 
1913 	return err;
1914 }
1915 
1916 __dead static void
1917 usage_log(void)
1918 {
1919 	endwin();
1920 	fprintf(stderr,
1921 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1922 	    getprogname());
1923 	exit(1);
1924 }
1925 
1926 /* Create newly allocated wide-character string equivalent to a byte string. */
1927 static const struct got_error *
1928 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1929 {
1930 	char *vis = NULL;
1931 	const struct got_error *err = NULL;
1932 
1933 	*ws = NULL;
1934 	*wlen = mbstowcs(NULL, s, 0);
1935 	if (*wlen == (size_t)-1) {
1936 		int vislen;
1937 		if (errno != EILSEQ)
1938 			return got_error_from_errno("mbstowcs");
1939 
1940 		/* byte string invalid in current encoding; try to "fix" it */
1941 		err = got_mbsavis(&vis, &vislen, s);
1942 		if (err)
1943 			return err;
1944 		*wlen = mbstowcs(NULL, vis, 0);
1945 		if (*wlen == (size_t)-1) {
1946 			err = got_error_from_errno("mbstowcs"); /* give up */
1947 			goto done;
1948 		}
1949 	}
1950 
1951 	*ws = calloc(*wlen + 1, sizeof(**ws));
1952 	if (*ws == NULL) {
1953 		err = got_error_from_errno("calloc");
1954 		goto done;
1955 	}
1956 
1957 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1958 		err = got_error_from_errno("mbstowcs");
1959 done:
1960 	free(vis);
1961 	if (err) {
1962 		free(*ws);
1963 		*ws = NULL;
1964 		*wlen = 0;
1965 	}
1966 	return err;
1967 }
1968 
1969 static const struct got_error *
1970 expand_tab(char **ptr, const char *src)
1971 {
1972 	char	*dst;
1973 	size_t	 len, n, idx = 0, sz = 0;
1974 
1975 	*ptr = NULL;
1976 	n = len = strlen(src);
1977 	dst = malloc(n + 1);
1978 	if (dst == NULL)
1979 		return got_error_from_errno("malloc");
1980 
1981 	while (idx < len && src[idx]) {
1982 		const char c = src[idx];
1983 
1984 		if (c == '\t') {
1985 			size_t nb = TABSIZE - sz % TABSIZE;
1986 			char *p;
1987 
1988 			p = realloc(dst, n + nb);
1989 			if (p == NULL) {
1990 				free(dst);
1991 				return got_error_from_errno("realloc");
1992 
1993 			}
1994 			dst = p;
1995 			n += nb;
1996 			memset(dst + sz, ' ', nb);
1997 			sz += nb;
1998 		} else
1999 			dst[sz++] = src[idx];
2000 		++idx;
2001 	}
2002 
2003 	dst[sz] = '\0';
2004 	*ptr = dst;
2005 	return NULL;
2006 }
2007 
2008 /*
2009  * Advance at most n columns from wline starting at offset off.
2010  * Return the index to the first character after the span operation.
2011  * Return the combined column width of all spanned wide character in
2012  * *rcol.
2013  */
2014 static int
2015 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2016 {
2017 	int width, i, cols = 0;
2018 
2019 	if (n == 0) {
2020 		*rcol = cols;
2021 		return off;
2022 	}
2023 
2024 	for (i = off; wline[i] != L'\0'; ++i) {
2025 		if (wline[i] == L'\t')
2026 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2027 		else
2028 			width = wcwidth(wline[i]);
2029 
2030 		if (width == -1) {
2031 			width = 1;
2032 			wline[i] = L'.';
2033 		}
2034 
2035 		if (cols + width > n)
2036 			break;
2037 		cols += width;
2038 	}
2039 
2040 	*rcol = cols;
2041 	return i;
2042 }
2043 
2044 /*
2045  * Format a line for display, ensuring that it won't overflow a width limit.
2046  * With scrolling, the width returned refers to the scrolled version of the
2047  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2048  */
2049 static const struct got_error *
2050 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2051     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2052 {
2053 	const struct got_error *err = NULL;
2054 	int cols;
2055 	wchar_t *wline = NULL;
2056 	char *exstr = NULL;
2057 	size_t wlen;
2058 	int i, scrollx;
2059 
2060 	*wlinep = NULL;
2061 	*widthp = 0;
2062 
2063 	if (expand) {
2064 		err = expand_tab(&exstr, line);
2065 		if (err)
2066 			return err;
2067 	}
2068 
2069 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2070 	free(exstr);
2071 	if (err)
2072 		return err;
2073 
2074 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2075 
2076 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2077 		wline[wlen - 1] = L'\0';
2078 		wlen--;
2079 	}
2080 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2081 		wline[wlen - 1] = L'\0';
2082 		wlen--;
2083 	}
2084 
2085 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2086 	wline[i] = L'\0';
2087 
2088 	if (widthp)
2089 		*widthp = cols;
2090 	if (scrollxp)
2091 		*scrollxp = scrollx;
2092 	if (err)
2093 		free(wline);
2094 	else
2095 		*wlinep = wline;
2096 	return err;
2097 }
2098 
2099 static const struct got_error*
2100 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2101     struct got_object_id *id, struct got_repository *repo)
2102 {
2103 	static const struct got_error *err = NULL;
2104 	struct got_reflist_entry *re;
2105 	char *s;
2106 	const char *name;
2107 
2108 	*refs_str = NULL;
2109 
2110 	TAILQ_FOREACH(re, refs, entry) {
2111 		struct got_tag_object *tag = NULL;
2112 		struct got_object_id *ref_id;
2113 		int cmp;
2114 
2115 		name = got_ref_get_name(re->ref);
2116 		if (strcmp(name, GOT_REF_HEAD) == 0)
2117 			continue;
2118 		if (strncmp(name, "refs/", 5) == 0)
2119 			name += 5;
2120 		if (strncmp(name, "got/", 4) == 0 &&
2121 		    strncmp(name, "got/backup/", 11) != 0)
2122 			continue;
2123 		if (strncmp(name, "heads/", 6) == 0)
2124 			name += 6;
2125 		if (strncmp(name, "remotes/", 8) == 0) {
2126 			name += 8;
2127 			s = strstr(name, "/" GOT_REF_HEAD);
2128 			if (s != NULL && s[strlen(s)] == '\0')
2129 				continue;
2130 		}
2131 		err = got_ref_resolve(&ref_id, repo, re->ref);
2132 		if (err)
2133 			break;
2134 		if (strncmp(name, "tags/", 5) == 0) {
2135 			err = got_object_open_as_tag(&tag, repo, ref_id);
2136 			if (err) {
2137 				if (err->code != GOT_ERR_OBJ_TYPE) {
2138 					free(ref_id);
2139 					break;
2140 				}
2141 				/* Ref points at something other than a tag. */
2142 				err = NULL;
2143 				tag = NULL;
2144 			}
2145 		}
2146 		cmp = got_object_id_cmp(tag ?
2147 		    got_object_tag_get_object_id(tag) : ref_id, id);
2148 		free(ref_id);
2149 		if (tag)
2150 			got_object_tag_close(tag);
2151 		if (cmp != 0)
2152 			continue;
2153 		s = *refs_str;
2154 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2155 		    s ? ", " : "", name) == -1) {
2156 			err = got_error_from_errno("asprintf");
2157 			free(s);
2158 			*refs_str = NULL;
2159 			break;
2160 		}
2161 		free(s);
2162 	}
2163 
2164 	return err;
2165 }
2166 
2167 static const struct got_error *
2168 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2169     int col_tab_align)
2170 {
2171 	char *smallerthan;
2172 
2173 	smallerthan = strchr(author, '<');
2174 	if (smallerthan && smallerthan[1] != '\0')
2175 		author = smallerthan + 1;
2176 	author[strcspn(author, "@>")] = '\0';
2177 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2178 	    col_tab_align, 0);
2179 }
2180 
2181 static const struct got_error *
2182 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2183     struct got_object_id *id, const size_t date_display_cols,
2184     int author_display_cols)
2185 {
2186 	struct tog_log_view_state *s = &view->state.log;
2187 	const struct got_error *err = NULL;
2188 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2189 	char *logmsg0 = NULL, *logmsg = NULL;
2190 	char *author = NULL;
2191 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2192 	int author_width, logmsg_width;
2193 	char *newline, *line = NULL;
2194 	int col, limit, scrollx;
2195 	const int avail = view->ncols;
2196 	struct tm tm;
2197 	time_t committer_time;
2198 	struct tog_color *tc;
2199 
2200 	committer_time = got_object_commit_get_committer_time(commit);
2201 	if (gmtime_r(&committer_time, &tm) == NULL)
2202 		return got_error_from_errno("gmtime_r");
2203 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2204 		return got_error(GOT_ERR_NO_SPACE);
2205 
2206 	if (avail <= date_display_cols)
2207 		limit = MIN(sizeof(datebuf) - 1, avail);
2208 	else
2209 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2210 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2211 	if (tc)
2212 		wattr_on(view->window,
2213 		    COLOR_PAIR(tc->colorpair), NULL);
2214 	waddnstr(view->window, datebuf, limit);
2215 	if (tc)
2216 		wattr_off(view->window,
2217 		    COLOR_PAIR(tc->colorpair), NULL);
2218 	col = limit;
2219 	if (col > avail)
2220 		goto done;
2221 
2222 	if (avail >= 120) {
2223 		char *id_str;
2224 		err = got_object_id_str(&id_str, id);
2225 		if (err)
2226 			goto done;
2227 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2228 		if (tc)
2229 			wattr_on(view->window,
2230 			    COLOR_PAIR(tc->colorpair), NULL);
2231 		wprintw(view->window, "%.8s ", id_str);
2232 		if (tc)
2233 			wattr_off(view->window,
2234 			    COLOR_PAIR(tc->colorpair), NULL);
2235 		free(id_str);
2236 		col += 9;
2237 		if (col > avail)
2238 			goto done;
2239 	}
2240 
2241 	if (s->use_committer)
2242 		author = strdup(got_object_commit_get_committer(commit));
2243 	else
2244 		author = strdup(got_object_commit_get_author(commit));
2245 	if (author == NULL) {
2246 		err = got_error_from_errno("strdup");
2247 		goto done;
2248 	}
2249 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2250 	if (err)
2251 		goto done;
2252 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2253 	if (tc)
2254 		wattr_on(view->window,
2255 		    COLOR_PAIR(tc->colorpair), NULL);
2256 	waddwstr(view->window, wauthor);
2257 	col += author_width;
2258 	while (col < avail && author_width < author_display_cols + 2) {
2259 		waddch(view->window, ' ');
2260 		col++;
2261 		author_width++;
2262 	}
2263 	if (tc)
2264 		wattr_off(view->window,
2265 		    COLOR_PAIR(tc->colorpair), NULL);
2266 	if (col > avail)
2267 		goto done;
2268 
2269 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2270 	if (err)
2271 		goto done;
2272 	logmsg = logmsg0;
2273 	while (*logmsg == '\n')
2274 		logmsg++;
2275 	newline = strchr(logmsg, '\n');
2276 	if (newline)
2277 		*newline = '\0';
2278 	limit = avail - col;
2279 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2280 		limit--;	/* for the border */
2281 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2282 	    limit, col, 1);
2283 	if (err)
2284 		goto done;
2285 	waddwstr(view->window, &wlogmsg[scrollx]);
2286 	col += MAX(logmsg_width, 0);
2287 	while (col < avail) {
2288 		waddch(view->window, ' ');
2289 		col++;
2290 	}
2291 done:
2292 	free(logmsg0);
2293 	free(wlogmsg);
2294 	free(author);
2295 	free(wauthor);
2296 	free(line);
2297 	return err;
2298 }
2299 
2300 static struct commit_queue_entry *
2301 alloc_commit_queue_entry(struct got_commit_object *commit,
2302     struct got_object_id *id)
2303 {
2304 	struct commit_queue_entry *entry;
2305 	struct got_object_id *dup;
2306 
2307 	entry = calloc(1, sizeof(*entry));
2308 	if (entry == NULL)
2309 		return NULL;
2310 
2311 	dup = got_object_id_dup(id);
2312 	if (dup == NULL) {
2313 		free(entry);
2314 		return NULL;
2315 	}
2316 
2317 	entry->id = dup;
2318 	entry->commit = commit;
2319 	return entry;
2320 }
2321 
2322 static void
2323 pop_commit(struct commit_queue *commits)
2324 {
2325 	struct commit_queue_entry *entry;
2326 
2327 	entry = TAILQ_FIRST(&commits->head);
2328 	TAILQ_REMOVE(&commits->head, entry, entry);
2329 	got_object_commit_close(entry->commit);
2330 	commits->ncommits--;
2331 	free(entry->id);
2332 	free(entry);
2333 }
2334 
2335 static void
2336 free_commits(struct commit_queue *commits)
2337 {
2338 	while (!TAILQ_EMPTY(&commits->head))
2339 		pop_commit(commits);
2340 }
2341 
2342 static const struct got_error *
2343 match_commit(int *have_match, struct got_object_id *id,
2344     struct got_commit_object *commit, regex_t *regex)
2345 {
2346 	const struct got_error *err = NULL;
2347 	regmatch_t regmatch;
2348 	char *id_str = NULL, *logmsg = NULL;
2349 
2350 	*have_match = 0;
2351 
2352 	err = got_object_id_str(&id_str, id);
2353 	if (err)
2354 		return err;
2355 
2356 	err = got_object_commit_get_logmsg(&logmsg, commit);
2357 	if (err)
2358 		goto done;
2359 
2360 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2361 	    &regmatch, 0) == 0 ||
2362 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2363 	    &regmatch, 0) == 0 ||
2364 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2365 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2366 		*have_match = 1;
2367 done:
2368 	free(id_str);
2369 	free(logmsg);
2370 	return err;
2371 }
2372 
2373 static const struct got_error *
2374 queue_commits(struct tog_log_thread_args *a)
2375 {
2376 	const struct got_error *err = NULL;
2377 
2378 	/*
2379 	 * We keep all commits open throughout the lifetime of the log
2380 	 * view in order to avoid having to re-fetch commits from disk
2381 	 * while updating the display.
2382 	 */
2383 	do {
2384 		struct got_object_id id;
2385 		struct got_commit_object *commit;
2386 		struct commit_queue_entry *entry;
2387 		int limit_match = 0;
2388 		int errcode;
2389 
2390 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2391 		    NULL, NULL);
2392 		if (err)
2393 			break;
2394 
2395 		err = got_object_open_as_commit(&commit, a->repo, &id);
2396 		if (err)
2397 			break;
2398 		entry = alloc_commit_queue_entry(commit, &id);
2399 		if (entry == NULL) {
2400 			err = got_error_from_errno("alloc_commit_queue_entry");
2401 			break;
2402 		}
2403 
2404 		errcode = pthread_mutex_lock(&tog_mutex);
2405 		if (errcode) {
2406 			err = got_error_set_errno(errcode,
2407 			    "pthread_mutex_lock");
2408 			break;
2409 		}
2410 
2411 		entry->idx = a->real_commits->ncommits;
2412 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2413 		a->real_commits->ncommits++;
2414 
2415 		if (*a->limiting) {
2416 			err = match_commit(&limit_match, &id, commit,
2417 			    a->limit_regex);
2418 			if (err)
2419 				break;
2420 
2421 			if (limit_match) {
2422 				struct commit_queue_entry *matched;
2423 
2424 				matched = alloc_commit_queue_entry(
2425 				    entry->commit, entry->id);
2426 				if (matched == NULL) {
2427 					err = got_error_from_errno(
2428 					    "alloc_commit_queue_entry");
2429 					break;
2430 				}
2431 				matched->commit = entry->commit;
2432 				got_object_commit_retain(entry->commit);
2433 
2434 				matched->idx = a->limit_commits->ncommits;
2435 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2436 				    matched, entry);
2437 				a->limit_commits->ncommits++;
2438 			}
2439 
2440 			/*
2441 			 * This is how we signal log_thread() that we
2442 			 * have found a match, and that it should be
2443 			 * counted as a new entry for the view.
2444 			 */
2445 			a->limit_match = limit_match;
2446 		}
2447 
2448 		if (*a->searching == TOG_SEARCH_FORWARD &&
2449 		    !*a->search_next_done) {
2450 			int have_match;
2451 			err = match_commit(&have_match, &id, commit, a->regex);
2452 			if (err)
2453 				break;
2454 
2455 			if (*a->limiting) {
2456 				if (limit_match && have_match)
2457 					*a->search_next_done =
2458 					    TOG_SEARCH_HAVE_MORE;
2459 			} else if (have_match)
2460 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2461 		}
2462 
2463 		errcode = pthread_mutex_unlock(&tog_mutex);
2464 		if (errcode && err == NULL)
2465 			err = got_error_set_errno(errcode,
2466 			    "pthread_mutex_unlock");
2467 		if (err)
2468 			break;
2469 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2470 
2471 	return err;
2472 }
2473 
2474 static void
2475 select_commit(struct tog_log_view_state *s)
2476 {
2477 	struct commit_queue_entry *entry;
2478 	int ncommits = 0;
2479 
2480 	entry = s->first_displayed_entry;
2481 	while (entry) {
2482 		if (ncommits == s->selected) {
2483 			s->selected_entry = entry;
2484 			break;
2485 		}
2486 		entry = TAILQ_NEXT(entry, entry);
2487 		ncommits++;
2488 	}
2489 }
2490 
2491 static const struct got_error *
2492 draw_commits(struct tog_view *view)
2493 {
2494 	const struct got_error *err = NULL;
2495 	struct tog_log_view_state *s = &view->state.log;
2496 	struct commit_queue_entry *entry = s->selected_entry;
2497 	int limit = view->nlines;
2498 	int width;
2499 	int ncommits, author_cols = 4;
2500 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2501 	char *refs_str = NULL;
2502 	wchar_t *wline;
2503 	struct tog_color *tc;
2504 	static const size_t date_display_cols = 12;
2505 
2506 	if (view_is_hsplit_top(view))
2507 		--limit;  /* account for border */
2508 
2509 	if (s->selected_entry &&
2510 	    !(view->searching && view->search_next_done == 0)) {
2511 		struct got_reflist_head *refs;
2512 		err = got_object_id_str(&id_str, s->selected_entry->id);
2513 		if (err)
2514 			return err;
2515 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2516 		    s->selected_entry->id);
2517 		if (refs) {
2518 			err = build_refs_str(&refs_str, refs,
2519 			    s->selected_entry->id, s->repo);
2520 			if (err)
2521 				goto done;
2522 		}
2523 	}
2524 
2525 	if (s->thread_args.commits_needed == 0)
2526 		halfdelay(10); /* disable fast refresh */
2527 
2528 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2529 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2530 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2531 		    (view->searching && !view->search_next_done) ?
2532 		    "searching..." : "loading...") == -1) {
2533 			err = got_error_from_errno("asprintf");
2534 			goto done;
2535 		}
2536 	} else {
2537 		const char *search_str = NULL;
2538 		const char *limit_str = NULL;
2539 
2540 		if (view->searching) {
2541 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2542 				search_str = "no more matches";
2543 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2544 				search_str = "no matches found";
2545 			else if (!view->search_next_done)
2546 				search_str = "searching...";
2547 		}
2548 
2549 		if (s->limit_view && s->commits->ncommits == 0)
2550 			limit_str = "no matches found";
2551 
2552 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2553 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2554 		    search_str ? search_str : (refs_str ? refs_str : ""),
2555 		    limit_str ? limit_str : "") == -1) {
2556 			err = got_error_from_errno("asprintf");
2557 			goto done;
2558 		}
2559 	}
2560 
2561 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2562 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2563 		    "........................................",
2564 		    s->in_repo_path, ncommits_str) == -1) {
2565 			err = got_error_from_errno("asprintf");
2566 			header = NULL;
2567 			goto done;
2568 		}
2569 	} else if (asprintf(&header, "commit %s%s",
2570 	    id_str ? id_str : "........................................",
2571 	    ncommits_str) == -1) {
2572 		err = got_error_from_errno("asprintf");
2573 		header = NULL;
2574 		goto done;
2575 	}
2576 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2577 	if (err)
2578 		goto done;
2579 
2580 	werase(view->window);
2581 
2582 	if (view_needs_focus_indication(view))
2583 		wstandout(view->window);
2584 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2585 	if (tc)
2586 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2587 	waddwstr(view->window, wline);
2588 	while (width < view->ncols) {
2589 		waddch(view->window, ' ');
2590 		width++;
2591 	}
2592 	if (tc)
2593 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2594 	if (view_needs_focus_indication(view))
2595 		wstandend(view->window);
2596 	free(wline);
2597 	if (limit <= 1)
2598 		goto done;
2599 
2600 	/* Grow author column size if necessary, and set view->maxx. */
2601 	entry = s->first_displayed_entry;
2602 	ncommits = 0;
2603 	view->maxx = 0;
2604 	while (entry) {
2605 		struct got_commit_object *c = entry->commit;
2606 		char *author, *eol, *msg, *msg0;
2607 		wchar_t *wauthor, *wmsg;
2608 		int width;
2609 		if (ncommits >= limit - 1)
2610 			break;
2611 		if (s->use_committer)
2612 			author = strdup(got_object_commit_get_committer(c));
2613 		else
2614 			author = strdup(got_object_commit_get_author(c));
2615 		if (author == NULL) {
2616 			err = got_error_from_errno("strdup");
2617 			goto done;
2618 		}
2619 		err = format_author(&wauthor, &width, author, COLS,
2620 		    date_display_cols);
2621 		if (author_cols < width)
2622 			author_cols = width;
2623 		free(wauthor);
2624 		free(author);
2625 		if (err)
2626 			goto done;
2627 		err = got_object_commit_get_logmsg(&msg0, c);
2628 		if (err)
2629 			goto done;
2630 		msg = msg0;
2631 		while (*msg == '\n')
2632 			++msg;
2633 		if ((eol = strchr(msg, '\n')))
2634 			*eol = '\0';
2635 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2636 		    date_display_cols + author_cols, 0);
2637 		if (err)
2638 			goto done;
2639 		view->maxx = MAX(view->maxx, width);
2640 		free(msg0);
2641 		free(wmsg);
2642 		ncommits++;
2643 		entry = TAILQ_NEXT(entry, entry);
2644 	}
2645 
2646 	entry = s->first_displayed_entry;
2647 	s->last_displayed_entry = s->first_displayed_entry;
2648 	ncommits = 0;
2649 	while (entry) {
2650 		if (ncommits >= limit - 1)
2651 			break;
2652 		if (ncommits == s->selected)
2653 			wstandout(view->window);
2654 		err = draw_commit(view, entry->commit, entry->id,
2655 		    date_display_cols, author_cols);
2656 		if (ncommits == s->selected)
2657 			wstandend(view->window);
2658 		if (err)
2659 			goto done;
2660 		ncommits++;
2661 		s->last_displayed_entry = entry;
2662 		entry = TAILQ_NEXT(entry, entry);
2663 	}
2664 
2665 	view_border(view);
2666 done:
2667 	free(id_str);
2668 	free(refs_str);
2669 	free(ncommits_str);
2670 	free(header);
2671 	return err;
2672 }
2673 
2674 static void
2675 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2676 {
2677 	struct commit_queue_entry *entry;
2678 	int nscrolled = 0;
2679 
2680 	entry = TAILQ_FIRST(&s->commits->head);
2681 	if (s->first_displayed_entry == entry)
2682 		return;
2683 
2684 	entry = s->first_displayed_entry;
2685 	while (entry && nscrolled < maxscroll) {
2686 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2687 		if (entry) {
2688 			s->first_displayed_entry = entry;
2689 			nscrolled++;
2690 		}
2691 	}
2692 }
2693 
2694 static const struct got_error *
2695 trigger_log_thread(struct tog_view *view, int wait)
2696 {
2697 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2698 	int errcode;
2699 
2700 	halfdelay(1); /* fast refresh while loading commits */
2701 
2702 	while (!ta->log_complete && !tog_thread_error &&
2703 	    (ta->commits_needed > 0 || ta->load_all)) {
2704 		/* Wake the log thread. */
2705 		errcode = pthread_cond_signal(&ta->need_commits);
2706 		if (errcode)
2707 			return got_error_set_errno(errcode,
2708 			    "pthread_cond_signal");
2709 
2710 		/*
2711 		 * The mutex will be released while the view loop waits
2712 		 * in wgetch(), at which time the log thread will run.
2713 		 */
2714 		if (!wait)
2715 			break;
2716 
2717 		/* Display progress update in log view. */
2718 		show_log_view(view);
2719 		update_panels();
2720 		doupdate();
2721 
2722 		/* Wait right here while next commit is being loaded. */
2723 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2724 		if (errcode)
2725 			return got_error_set_errno(errcode,
2726 			    "pthread_cond_wait");
2727 
2728 		/* Display progress update in log view. */
2729 		show_log_view(view);
2730 		update_panels();
2731 		doupdate();
2732 	}
2733 
2734 	return NULL;
2735 }
2736 
2737 static const struct got_error *
2738 request_log_commits(struct tog_view *view)
2739 {
2740 	struct tog_log_view_state	*state = &view->state.log;
2741 	const struct got_error		*err = NULL;
2742 
2743 	if (state->thread_args.log_complete)
2744 		return NULL;
2745 
2746 	state->thread_args.commits_needed += view->nscrolled;
2747 	err = trigger_log_thread(view, 1);
2748 	view->nscrolled = 0;
2749 
2750 	return err;
2751 }
2752 
2753 static const struct got_error *
2754 log_scroll_down(struct tog_view *view, int maxscroll)
2755 {
2756 	struct tog_log_view_state *s = &view->state.log;
2757 	const struct got_error *err = NULL;
2758 	struct commit_queue_entry *pentry;
2759 	int nscrolled = 0, ncommits_needed;
2760 
2761 	if (s->last_displayed_entry == NULL)
2762 		return NULL;
2763 
2764 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2765 	if (s->commits->ncommits < ncommits_needed &&
2766 	    !s->thread_args.log_complete) {
2767 		/*
2768 		 * Ask the log thread for required amount of commits.
2769 		 */
2770 		s->thread_args.commits_needed +=
2771 		    ncommits_needed - s->commits->ncommits;
2772 		err = trigger_log_thread(view, 1);
2773 		if (err)
2774 			return err;
2775 	}
2776 
2777 	do {
2778 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2779 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2780 			break;
2781 
2782 		s->last_displayed_entry = pentry ?
2783 		    pentry : s->last_displayed_entry;
2784 
2785 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2786 		if (pentry == NULL)
2787 			break;
2788 		s->first_displayed_entry = pentry;
2789 	} while (++nscrolled < maxscroll);
2790 
2791 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2792 		view->nscrolled += nscrolled;
2793 	else
2794 		view->nscrolled = 0;
2795 
2796 	return err;
2797 }
2798 
2799 static const struct got_error *
2800 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2801     struct got_commit_object *commit, struct got_object_id *commit_id,
2802     struct tog_view *log_view, struct got_repository *repo)
2803 {
2804 	const struct got_error *err;
2805 	struct got_object_qid *parent_id;
2806 	struct tog_view *diff_view;
2807 
2808 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2809 	if (diff_view == NULL)
2810 		return got_error_from_errno("view_open");
2811 
2812 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2813 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2814 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2815 	if (err == NULL)
2816 		*new_view = diff_view;
2817 	return err;
2818 }
2819 
2820 static const struct got_error *
2821 tree_view_visit_subtree(struct tog_tree_view_state *s,
2822     struct got_tree_object *subtree)
2823 {
2824 	struct tog_parent_tree *parent;
2825 
2826 	parent = calloc(1, sizeof(*parent));
2827 	if (parent == NULL)
2828 		return got_error_from_errno("calloc");
2829 
2830 	parent->tree = s->tree;
2831 	parent->first_displayed_entry = s->first_displayed_entry;
2832 	parent->selected_entry = s->selected_entry;
2833 	parent->selected = s->selected;
2834 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2835 	s->tree = subtree;
2836 	s->selected = 0;
2837 	s->first_displayed_entry = NULL;
2838 	return NULL;
2839 }
2840 
2841 static const struct got_error *
2842 tree_view_walk_path(struct tog_tree_view_state *s,
2843     struct got_commit_object *commit, const char *path)
2844 {
2845 	const struct got_error *err = NULL;
2846 	struct got_tree_object *tree = NULL;
2847 	const char *p;
2848 	char *slash, *subpath = NULL;
2849 
2850 	/* Walk the path and open corresponding tree objects. */
2851 	p = path;
2852 	while (*p) {
2853 		struct got_tree_entry *te;
2854 		struct got_object_id *tree_id;
2855 		char *te_name;
2856 
2857 		while (p[0] == '/')
2858 			p++;
2859 
2860 		/* Ensure the correct subtree entry is selected. */
2861 		slash = strchr(p, '/');
2862 		if (slash == NULL)
2863 			te_name = strdup(p);
2864 		else
2865 			te_name = strndup(p, slash - p);
2866 		if (te_name == NULL) {
2867 			err = got_error_from_errno("strndup");
2868 			break;
2869 		}
2870 		te = got_object_tree_find_entry(s->tree, te_name);
2871 		if (te == NULL) {
2872 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2873 			free(te_name);
2874 			break;
2875 		}
2876 		free(te_name);
2877 		s->first_displayed_entry = s->selected_entry = te;
2878 
2879 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2880 			break; /* jump to this file's entry */
2881 
2882 		slash = strchr(p, '/');
2883 		if (slash)
2884 			subpath = strndup(path, slash - path);
2885 		else
2886 			subpath = strdup(path);
2887 		if (subpath == NULL) {
2888 			err = got_error_from_errno("strdup");
2889 			break;
2890 		}
2891 
2892 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2893 		    subpath);
2894 		if (err)
2895 			break;
2896 
2897 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2898 		free(tree_id);
2899 		if (err)
2900 			break;
2901 
2902 		err = tree_view_visit_subtree(s, tree);
2903 		if (err) {
2904 			got_object_tree_close(tree);
2905 			break;
2906 		}
2907 		if (slash == NULL)
2908 			break;
2909 		free(subpath);
2910 		subpath = NULL;
2911 		p = slash;
2912 	}
2913 
2914 	free(subpath);
2915 	return err;
2916 }
2917 
2918 static const struct got_error *
2919 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2920     struct commit_queue_entry *entry, const char *path,
2921     const char *head_ref_name, struct got_repository *repo)
2922 {
2923 	const struct got_error *err = NULL;
2924 	struct tog_tree_view_state *s;
2925 	struct tog_view *tree_view;
2926 
2927 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2928 	if (tree_view == NULL)
2929 		return got_error_from_errno("view_open");
2930 
2931 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2932 	if (err)
2933 		return err;
2934 	s = &tree_view->state.tree;
2935 
2936 	*new_view = tree_view;
2937 
2938 	if (got_path_is_root_dir(path))
2939 		return NULL;
2940 
2941 	return tree_view_walk_path(s, entry->commit, path);
2942 }
2943 
2944 static const struct got_error *
2945 block_signals_used_by_main_thread(void)
2946 {
2947 	sigset_t sigset;
2948 	int errcode;
2949 
2950 	if (sigemptyset(&sigset) == -1)
2951 		return got_error_from_errno("sigemptyset");
2952 
2953 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2954 	if (sigaddset(&sigset, SIGWINCH) == -1)
2955 		return got_error_from_errno("sigaddset");
2956 	if (sigaddset(&sigset, SIGCONT) == -1)
2957 		return got_error_from_errno("sigaddset");
2958 	if (sigaddset(&sigset, SIGINT) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 	if (sigaddset(&sigset, SIGTERM) == -1)
2961 		return got_error_from_errno("sigaddset");
2962 
2963 	/* ncurses handles SIGTSTP */
2964 	if (sigaddset(&sigset, SIGTSTP) == -1)
2965 		return got_error_from_errno("sigaddset");
2966 
2967 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2968 	if (errcode)
2969 		return got_error_set_errno(errcode, "pthread_sigmask");
2970 
2971 	return NULL;
2972 }
2973 
2974 static void *
2975 log_thread(void *arg)
2976 {
2977 	const struct got_error *err = NULL;
2978 	int errcode = 0;
2979 	struct tog_log_thread_args *a = arg;
2980 	int done = 0;
2981 
2982 	/*
2983 	 * Sync startup with main thread such that we begin our
2984 	 * work once view_input() has released the mutex.
2985 	 */
2986 	errcode = pthread_mutex_lock(&tog_mutex);
2987 	if (errcode) {
2988 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2989 		return (void *)err;
2990 	}
2991 
2992 	err = block_signals_used_by_main_thread();
2993 	if (err) {
2994 		pthread_mutex_unlock(&tog_mutex);
2995 		goto done;
2996 	}
2997 
2998 	while (!done && !err && !tog_fatal_signal_received()) {
2999 		errcode = pthread_mutex_unlock(&tog_mutex);
3000 		if (errcode) {
3001 			err = got_error_set_errno(errcode,
3002 			    "pthread_mutex_unlock");
3003 			goto done;
3004 		}
3005 		err = queue_commits(a);
3006 		if (err) {
3007 			if (err->code != GOT_ERR_ITER_COMPLETED)
3008 				goto done;
3009 			err = NULL;
3010 			done = 1;
3011 		} else if (a->commits_needed > 0 && !a->load_all) {
3012 			if (*a->limiting) {
3013 				if (a->limit_match)
3014 					a->commits_needed--;
3015 			} else
3016 				a->commits_needed--;
3017 		}
3018 
3019 		errcode = pthread_mutex_lock(&tog_mutex);
3020 		if (errcode) {
3021 			err = got_error_set_errno(errcode,
3022 			    "pthread_mutex_lock");
3023 			goto done;
3024 		} else if (*a->quit)
3025 			done = 1;
3026 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3027 			*a->first_displayed_entry =
3028 			    TAILQ_FIRST(&a->limit_commits->head);
3029 			*a->selected_entry = *a->first_displayed_entry;
3030 		} else if (*a->first_displayed_entry == NULL) {
3031 			*a->first_displayed_entry =
3032 			    TAILQ_FIRST(&a->real_commits->head);
3033 			*a->selected_entry = *a->first_displayed_entry;
3034 		}
3035 
3036 		errcode = pthread_cond_signal(&a->commit_loaded);
3037 		if (errcode) {
3038 			err = got_error_set_errno(errcode,
3039 			    "pthread_cond_signal");
3040 			pthread_mutex_unlock(&tog_mutex);
3041 			goto done;
3042 		}
3043 
3044 		if (done)
3045 			a->commits_needed = 0;
3046 		else {
3047 			if (a->commits_needed == 0 && !a->load_all) {
3048 				errcode = pthread_cond_wait(&a->need_commits,
3049 				    &tog_mutex);
3050 				if (errcode) {
3051 					err = got_error_set_errno(errcode,
3052 					    "pthread_cond_wait");
3053 					pthread_mutex_unlock(&tog_mutex);
3054 					goto done;
3055 				}
3056 				if (*a->quit)
3057 					done = 1;
3058 			}
3059 		}
3060 	}
3061 	a->log_complete = 1;
3062 	errcode = pthread_mutex_unlock(&tog_mutex);
3063 	if (errcode)
3064 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3065 done:
3066 	if (err) {
3067 		tog_thread_error = 1;
3068 		pthread_cond_signal(&a->commit_loaded);
3069 	}
3070 	return (void *)err;
3071 }
3072 
3073 static const struct got_error *
3074 stop_log_thread(struct tog_log_view_state *s)
3075 {
3076 	const struct got_error *err = NULL, *thread_err = NULL;
3077 	int errcode;
3078 
3079 	if (s->thread) {
3080 		s->quit = 1;
3081 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3082 		if (errcode)
3083 			return got_error_set_errno(errcode,
3084 			    "pthread_cond_signal");
3085 		errcode = pthread_mutex_unlock(&tog_mutex);
3086 		if (errcode)
3087 			return got_error_set_errno(errcode,
3088 			    "pthread_mutex_unlock");
3089 		errcode = pthread_join(s->thread, (void **)&thread_err);
3090 		if (errcode)
3091 			return got_error_set_errno(errcode, "pthread_join");
3092 		errcode = pthread_mutex_lock(&tog_mutex);
3093 		if (errcode)
3094 			return got_error_set_errno(errcode,
3095 			    "pthread_mutex_lock");
3096 		s->thread = NULL;
3097 	}
3098 
3099 	if (s->thread_args.repo) {
3100 		err = got_repo_close(s->thread_args.repo);
3101 		s->thread_args.repo = NULL;
3102 	}
3103 
3104 	if (s->thread_args.pack_fds) {
3105 		const struct got_error *pack_err =
3106 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3107 		if (err == NULL)
3108 			err = pack_err;
3109 		s->thread_args.pack_fds = NULL;
3110 	}
3111 
3112 	if (s->thread_args.graph) {
3113 		got_commit_graph_close(s->thread_args.graph);
3114 		s->thread_args.graph = NULL;
3115 	}
3116 
3117 	return err ? err : thread_err;
3118 }
3119 
3120 static const struct got_error *
3121 close_log_view(struct tog_view *view)
3122 {
3123 	const struct got_error *err = NULL;
3124 	struct tog_log_view_state *s = &view->state.log;
3125 	int errcode;
3126 
3127 	err = stop_log_thread(s);
3128 
3129 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3130 	if (errcode && err == NULL)
3131 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3132 
3133 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3134 	if (errcode && err == NULL)
3135 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3136 
3137 	free_commits(&s->limit_commits);
3138 	free_commits(&s->real_commits);
3139 	free(s->in_repo_path);
3140 	s->in_repo_path = NULL;
3141 	free(s->start_id);
3142 	s->start_id = NULL;
3143 	free(s->head_ref_name);
3144 	s->head_ref_name = NULL;
3145 	return err;
3146 }
3147 
3148 /*
3149  * We use two queues to implement the limit feature: first consists of
3150  * commits matching the current limit_regex; second is the real queue
3151  * of all known commits (real_commits). When the user starts limiting,
3152  * we swap queues such that all movement and displaying functionality
3153  * works with very slight change.
3154  */
3155 static const struct got_error *
3156 limit_log_view(struct tog_view *view)
3157 {
3158 	struct tog_log_view_state *s = &view->state.log;
3159 	struct commit_queue_entry *entry;
3160 	struct tog_view	*v = view;
3161 	const struct got_error *err = NULL;
3162 	char pattern[1024];
3163 	int ret;
3164 
3165 	if (view_is_hsplit_top(view))
3166 		v = view->child;
3167 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3168 		v = view->parent;
3169 
3170 	/* Get the pattern */
3171 	wmove(v->window, v->nlines - 1, 0);
3172 	wclrtoeol(v->window);
3173 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3174 	nodelay(v->window, FALSE);
3175 	nocbreak();
3176 	echo();
3177 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3178 	cbreak();
3179 	noecho();
3180 	nodelay(v->window, TRUE);
3181 	if (ret == ERR)
3182 		return NULL;
3183 
3184 	if (*pattern == '\0') {
3185 		/*
3186 		 * Safety measure for the situation where the user
3187 		 * resets limit without previously limiting anything.
3188 		 */
3189 		if (!s->limit_view)
3190 			return NULL;
3191 
3192 		/*
3193 		 * User could have pressed Ctrl+L, which refreshed the
3194 		 * commit queues, it means we can't save previously
3195 		 * (before limit took place) displayed entries,
3196 		 * because they would point to already free'ed memory,
3197 		 * so we are forced to always select first entry of
3198 		 * the queue.
3199 		 */
3200 		s->commits = &s->real_commits;
3201 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3202 		s->selected_entry = s->first_displayed_entry;
3203 		s->selected = 0;
3204 		s->limit_view = 0;
3205 
3206 		return NULL;
3207 	}
3208 
3209 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3210 		return NULL;
3211 
3212 	s->limit_view = 1;
3213 
3214 	/* Clear the screen while loading limit view */
3215 	s->first_displayed_entry = NULL;
3216 	s->last_displayed_entry = NULL;
3217 	s->selected_entry = NULL;
3218 	s->commits = &s->limit_commits;
3219 
3220 	/* Prepare limit queue for new search */
3221 	free_commits(&s->limit_commits);
3222 	s->limit_commits.ncommits = 0;
3223 
3224 	/* First process commits, which are in queue already */
3225 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3226 		int have_match = 0;
3227 
3228 		err = match_commit(&have_match, entry->id,
3229 		    entry->commit, &s->limit_regex);
3230 		if (err)
3231 			return err;
3232 
3233 		if (have_match) {
3234 			struct commit_queue_entry *matched;
3235 
3236 			matched = alloc_commit_queue_entry(entry->commit,
3237 			    entry->id);
3238 			if (matched == NULL) {
3239 				err = got_error_from_errno(
3240 				    "alloc_commit_queue_entry");
3241 				break;
3242 			}
3243 			matched->commit = entry->commit;
3244 			got_object_commit_retain(entry->commit);
3245 
3246 			matched->idx = s->limit_commits.ncommits;
3247 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3248 			    matched, entry);
3249 			s->limit_commits.ncommits++;
3250 		}
3251 	}
3252 
3253 	/* Second process all the commits, until we fill the screen */
3254 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3255 	    !s->thread_args.log_complete) {
3256 		s->thread_args.commits_needed +=
3257 		    view->nlines - s->limit_commits.ncommits - 1;
3258 		err = trigger_log_thread(view, 1);
3259 		if (err)
3260 			return err;
3261 	}
3262 
3263 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3264 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3265 	s->selected = 0;
3266 
3267 	return NULL;
3268 }
3269 
3270 static const struct got_error *
3271 search_start_log_view(struct tog_view *view)
3272 {
3273 	struct tog_log_view_state *s = &view->state.log;
3274 
3275 	s->matched_entry = NULL;
3276 	s->search_entry = NULL;
3277 	return NULL;
3278 }
3279 
3280 static const struct got_error *
3281 search_next_log_view(struct tog_view *view)
3282 {
3283 	const struct got_error *err = NULL;
3284 	struct tog_log_view_state *s = &view->state.log;
3285 	struct commit_queue_entry *entry;
3286 
3287 	/* Display progress update in log view. */
3288 	show_log_view(view);
3289 	update_panels();
3290 	doupdate();
3291 
3292 	if (s->search_entry) {
3293 		int errcode, ch;
3294 		errcode = pthread_mutex_unlock(&tog_mutex);
3295 		if (errcode)
3296 			return got_error_set_errno(errcode,
3297 			    "pthread_mutex_unlock");
3298 		ch = wgetch(view->window);
3299 		errcode = pthread_mutex_lock(&tog_mutex);
3300 		if (errcode)
3301 			return got_error_set_errno(errcode,
3302 			    "pthread_mutex_lock");
3303 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3304 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3305 			return NULL;
3306 		}
3307 		if (view->searching == TOG_SEARCH_FORWARD)
3308 			entry = TAILQ_NEXT(s->search_entry, entry);
3309 		else
3310 			entry = TAILQ_PREV(s->search_entry,
3311 			    commit_queue_head, entry);
3312 	} else if (s->matched_entry) {
3313 		/*
3314 		 * If the user has moved the cursor after we hit a match,
3315 		 * the position from where we should continue searching
3316 		 * might have changed.
3317 		 */
3318 		if (view->searching == TOG_SEARCH_FORWARD)
3319 			entry = TAILQ_NEXT(s->selected_entry, entry);
3320 		else
3321 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3322 			    entry);
3323 	} else {
3324 		entry = s->selected_entry;
3325 	}
3326 
3327 	while (1) {
3328 		int have_match = 0;
3329 
3330 		if (entry == NULL) {
3331 			if (s->thread_args.log_complete ||
3332 			    view->searching == TOG_SEARCH_BACKWARD) {
3333 				view->search_next_done =
3334 				    (s->matched_entry == NULL ?
3335 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3336 				s->search_entry = NULL;
3337 				return NULL;
3338 			}
3339 			/*
3340 			 * Poke the log thread for more commits and return,
3341 			 * allowing the main loop to make progress. Search
3342 			 * will resume at s->search_entry once we come back.
3343 			 */
3344 			s->thread_args.commits_needed++;
3345 			return trigger_log_thread(view, 0);
3346 		}
3347 
3348 		err = match_commit(&have_match, entry->id, entry->commit,
3349 		    &view->regex);
3350 		if (err)
3351 			break;
3352 		if (have_match) {
3353 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3354 			s->matched_entry = entry;
3355 			break;
3356 		}
3357 
3358 		s->search_entry = entry;
3359 		if (view->searching == TOG_SEARCH_FORWARD)
3360 			entry = TAILQ_NEXT(entry, entry);
3361 		else
3362 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3363 	}
3364 
3365 	if (s->matched_entry) {
3366 		int cur = s->selected_entry->idx;
3367 		while (cur < s->matched_entry->idx) {
3368 			err = input_log_view(NULL, view, KEY_DOWN);
3369 			if (err)
3370 				return err;
3371 			cur++;
3372 		}
3373 		while (cur > s->matched_entry->idx) {
3374 			err = input_log_view(NULL, view, KEY_UP);
3375 			if (err)
3376 				return err;
3377 			cur--;
3378 		}
3379 	}
3380 
3381 	s->search_entry = NULL;
3382 
3383 	return NULL;
3384 }
3385 
3386 static const struct got_error *
3387 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3388     struct got_repository *repo, const char *head_ref_name,
3389     const char *in_repo_path, int log_branches)
3390 {
3391 	const struct got_error *err = NULL;
3392 	struct tog_log_view_state *s = &view->state.log;
3393 	struct got_repository *thread_repo = NULL;
3394 	struct got_commit_graph *thread_graph = NULL;
3395 	int errcode;
3396 
3397 	if (in_repo_path != s->in_repo_path) {
3398 		free(s->in_repo_path);
3399 		s->in_repo_path = strdup(in_repo_path);
3400 		if (s->in_repo_path == NULL)
3401 			return got_error_from_errno("strdup");
3402 	}
3403 
3404 	/* The commit queue only contains commits being displayed. */
3405 	TAILQ_INIT(&s->real_commits.head);
3406 	s->real_commits.ncommits = 0;
3407 	s->commits = &s->real_commits;
3408 
3409 	TAILQ_INIT(&s->limit_commits.head);
3410 	s->limit_view = 0;
3411 	s->limit_commits.ncommits = 0;
3412 
3413 	s->repo = repo;
3414 	if (head_ref_name) {
3415 		s->head_ref_name = strdup(head_ref_name);
3416 		if (s->head_ref_name == NULL) {
3417 			err = got_error_from_errno("strdup");
3418 			goto done;
3419 		}
3420 	}
3421 	s->start_id = got_object_id_dup(start_id);
3422 	if (s->start_id == NULL) {
3423 		err = got_error_from_errno("got_object_id_dup");
3424 		goto done;
3425 	}
3426 	s->log_branches = log_branches;
3427 	s->use_committer = 1;
3428 
3429 	STAILQ_INIT(&s->colors);
3430 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3431 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3432 		    get_color_value("TOG_COLOR_COMMIT"));
3433 		if (err)
3434 			goto done;
3435 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3436 		    get_color_value("TOG_COLOR_AUTHOR"));
3437 		if (err) {
3438 			free_colors(&s->colors);
3439 			goto done;
3440 		}
3441 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3442 		    get_color_value("TOG_COLOR_DATE"));
3443 		if (err) {
3444 			free_colors(&s->colors);
3445 			goto done;
3446 		}
3447 	}
3448 
3449 	view->show = show_log_view;
3450 	view->input = input_log_view;
3451 	view->resize = resize_log_view;
3452 	view->close = close_log_view;
3453 	view->search_start = search_start_log_view;
3454 	view->search_next = search_next_log_view;
3455 
3456 	if (s->thread_args.pack_fds == NULL) {
3457 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3458 		if (err)
3459 			goto done;
3460 	}
3461 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3462 	    s->thread_args.pack_fds);
3463 	if (err)
3464 		goto done;
3465 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3466 	    !s->log_branches);
3467 	if (err)
3468 		goto done;
3469 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3470 	    s->repo, NULL, NULL);
3471 	if (err)
3472 		goto done;
3473 
3474 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3475 	if (errcode) {
3476 		err = got_error_set_errno(errcode, "pthread_cond_init");
3477 		goto done;
3478 	}
3479 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3480 	if (errcode) {
3481 		err = got_error_set_errno(errcode, "pthread_cond_init");
3482 		goto done;
3483 	}
3484 
3485 	s->thread_args.commits_needed = view->nlines;
3486 	s->thread_args.graph = thread_graph;
3487 	s->thread_args.real_commits = &s->real_commits;
3488 	s->thread_args.limit_commits = &s->limit_commits;
3489 	s->thread_args.in_repo_path = s->in_repo_path;
3490 	s->thread_args.start_id = s->start_id;
3491 	s->thread_args.repo = thread_repo;
3492 	s->thread_args.log_complete = 0;
3493 	s->thread_args.quit = &s->quit;
3494 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3495 	s->thread_args.selected_entry = &s->selected_entry;
3496 	s->thread_args.searching = &view->searching;
3497 	s->thread_args.search_next_done = &view->search_next_done;
3498 	s->thread_args.regex = &view->regex;
3499 	s->thread_args.limiting = &s->limit_view;
3500 	s->thread_args.limit_regex = &s->limit_regex;
3501 	s->thread_args.limit_commits = &s->limit_commits;
3502 done:
3503 	if (err)
3504 		close_log_view(view);
3505 	return err;
3506 }
3507 
3508 static const struct got_error *
3509 show_log_view(struct tog_view *view)
3510 {
3511 	const struct got_error *err;
3512 	struct tog_log_view_state *s = &view->state.log;
3513 
3514 	if (s->thread == NULL) {
3515 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3516 		    &s->thread_args);
3517 		if (errcode)
3518 			return got_error_set_errno(errcode, "pthread_create");
3519 		if (s->thread_args.commits_needed > 0) {
3520 			err = trigger_log_thread(view, 1);
3521 			if (err)
3522 				return err;
3523 		}
3524 	}
3525 
3526 	return draw_commits(view);
3527 }
3528 
3529 static void
3530 log_move_cursor_up(struct tog_view *view, int page, int home)
3531 {
3532 	struct tog_log_view_state *s = &view->state.log;
3533 
3534 	if (s->first_displayed_entry == NULL)
3535 		return;
3536 	if (s->selected_entry->idx == 0)
3537 		view->count = 0;
3538 
3539 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3540 	    || home)
3541 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3542 
3543 	if (!page && !home && s->selected > 0)
3544 		--s->selected;
3545 	else
3546 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3547 
3548 	select_commit(s);
3549 	return;
3550 }
3551 
3552 static const struct got_error *
3553 log_move_cursor_down(struct tog_view *view, int page)
3554 {
3555 	struct tog_log_view_state	*s = &view->state.log;
3556 	const struct got_error		*err = NULL;
3557 	int				 eos = view->nlines - 2;
3558 
3559 	if (s->first_displayed_entry == NULL)
3560 		return NULL;
3561 
3562 	if (s->thread_args.log_complete &&
3563 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3564 		return NULL;
3565 
3566 	if (view_is_hsplit_top(view))
3567 		--eos;  /* border consumes the last line */
3568 
3569 	if (!page) {
3570 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3571 			++s->selected;
3572 		else
3573 			err = log_scroll_down(view, 1);
3574 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3575 		struct commit_queue_entry *entry;
3576 		int n;
3577 
3578 		s->selected = 0;
3579 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3580 		s->last_displayed_entry = entry;
3581 		for (n = 0; n <= eos; n++) {
3582 			if (entry == NULL)
3583 				break;
3584 			s->first_displayed_entry = entry;
3585 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3586 		}
3587 		if (n > 0)
3588 			s->selected = n - 1;
3589 	} else {
3590 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3591 		    s->thread_args.log_complete)
3592 			s->selected += MIN(page,
3593 			    s->commits->ncommits - s->selected_entry->idx - 1);
3594 		else
3595 			err = log_scroll_down(view, page);
3596 	}
3597 	if (err)
3598 		return err;
3599 
3600 	/*
3601 	 * We might necessarily overshoot in horizontal
3602 	 * splits; if so, select the last displayed commit.
3603 	 */
3604 	if (s->first_displayed_entry && s->last_displayed_entry) {
3605 		s->selected = MIN(s->selected,
3606 		    s->last_displayed_entry->idx -
3607 		    s->first_displayed_entry->idx);
3608 	}
3609 
3610 	select_commit(s);
3611 
3612 	if (s->thread_args.log_complete &&
3613 	    s->selected_entry->idx == s->commits->ncommits - 1)
3614 		view->count = 0;
3615 
3616 	return NULL;
3617 }
3618 
3619 static void
3620 view_get_split(struct tog_view *view, int *y, int *x)
3621 {
3622 	*x = 0;
3623 	*y = 0;
3624 
3625 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3626 		if (view->child && view->child->resized_y)
3627 			*y = view->child->resized_y;
3628 		else if (view->resized_y)
3629 			*y = view->resized_y;
3630 		else
3631 			*y = view_split_begin_y(view->lines);
3632 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3633 		if (view->child && view->child->resized_x)
3634 			*x = view->child->resized_x;
3635 		else if (view->resized_x)
3636 			*x = view->resized_x;
3637 		else
3638 			*x = view_split_begin_x(view->begin_x);
3639 	}
3640 }
3641 
3642 /* Split view horizontally at y and offset view->state->selected line. */
3643 static const struct got_error *
3644 view_init_hsplit(struct tog_view *view, int y)
3645 {
3646 	const struct got_error *err = NULL;
3647 
3648 	view->nlines = y;
3649 	view->ncols = COLS;
3650 	err = view_resize(view);
3651 	if (err)
3652 		return err;
3653 
3654 	err = offset_selection_down(view);
3655 
3656 	return err;
3657 }
3658 
3659 static const struct got_error *
3660 log_goto_line(struct tog_view *view, int nlines)
3661 {
3662 	const struct got_error		*err = NULL;
3663 	struct tog_log_view_state	*s = &view->state.log;
3664 	int				 g, idx = s->selected_entry->idx;
3665 
3666 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3667 		return NULL;
3668 
3669 	g = view->gline;
3670 	view->gline = 0;
3671 
3672 	if (g >= s->first_displayed_entry->idx + 1 &&
3673 	    g <= s->last_displayed_entry->idx + 1 &&
3674 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3675 		s->selected = g - s->first_displayed_entry->idx - 1;
3676 		select_commit(s);
3677 		return NULL;
3678 	}
3679 
3680 	if (idx + 1 < g) {
3681 		err = log_move_cursor_down(view, g - idx - 1);
3682 		if (!err && g > s->selected_entry->idx + 1)
3683 			err = log_move_cursor_down(view,
3684 			    g - s->first_displayed_entry->idx - 1);
3685 		if (err)
3686 			return err;
3687 	} else if (idx + 1 > g)
3688 		log_move_cursor_up(view, idx - g + 1, 0);
3689 
3690 	if (g < nlines && s->first_displayed_entry->idx == 0)
3691 		s->selected = g - 1;
3692 
3693 	select_commit(s);
3694 	return NULL;
3695 
3696 }
3697 
3698 static void
3699 horizontal_scroll_input(struct tog_view *view, int ch)
3700 {
3701 
3702 	switch (ch) {
3703 	case KEY_LEFT:
3704 	case 'h':
3705 		view->x -= MIN(view->x, 2);
3706 		if (view->x <= 0)
3707 			view->count = 0;
3708 		break;
3709 	case KEY_RIGHT:
3710 	case 'l':
3711 		if (view->x + view->ncols / 2 < view->maxx)
3712 			view->x += 2;
3713 		else
3714 			view->count = 0;
3715 		break;
3716 	case '0':
3717 		view->x = 0;
3718 		break;
3719 	case '$':
3720 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3721 		view->count = 0;
3722 		break;
3723 	default:
3724 		break;
3725 	}
3726 }
3727 
3728 static const struct got_error *
3729 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3730 {
3731 	const struct got_error *err = NULL;
3732 	struct tog_log_view_state *s = &view->state.log;
3733 	int eos, nscroll;
3734 
3735 	if (s->thread_args.load_all) {
3736 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3737 			s->thread_args.load_all = 0;
3738 		else if (s->thread_args.log_complete) {
3739 			err = log_move_cursor_down(view, s->commits->ncommits);
3740 			s->thread_args.load_all = 0;
3741 		}
3742 		if (err)
3743 			return err;
3744 	}
3745 
3746 	eos = nscroll = view->nlines - 1;
3747 	if (view_is_hsplit_top(view))
3748 		--eos;  /* border */
3749 
3750 	if (view->gline)
3751 		return log_goto_line(view, eos);
3752 
3753 	switch (ch) {
3754 	case '&':
3755 		err = limit_log_view(view);
3756 		break;
3757 	case 'q':
3758 		s->quit = 1;
3759 		break;
3760 	case '0':
3761 	case '$':
3762 	case KEY_RIGHT:
3763 	case 'l':
3764 	case KEY_LEFT:
3765 	case 'h':
3766 		horizontal_scroll_input(view, ch);
3767 		break;
3768 	case 'k':
3769 	case KEY_UP:
3770 	case '<':
3771 	case ',':
3772 	case CTRL('p'):
3773 		log_move_cursor_up(view, 0, 0);
3774 		break;
3775 	case 'g':
3776 	case '=':
3777 	case KEY_HOME:
3778 		log_move_cursor_up(view, 0, 1);
3779 		view->count = 0;
3780 		break;
3781 	case CTRL('u'):
3782 	case 'u':
3783 		nscroll /= 2;
3784 		/* FALL THROUGH */
3785 	case KEY_PPAGE:
3786 	case CTRL('b'):
3787 	case 'b':
3788 		log_move_cursor_up(view, nscroll, 0);
3789 		break;
3790 	case 'j':
3791 	case KEY_DOWN:
3792 	case '>':
3793 	case '.':
3794 	case CTRL('n'):
3795 		err = log_move_cursor_down(view, 0);
3796 		break;
3797 	case '@':
3798 		s->use_committer = !s->use_committer;
3799 		view->action = s->use_committer ?
3800 		    "show committer" : "show commit author";
3801 		break;
3802 	case 'G':
3803 	case '*':
3804 	case KEY_END: {
3805 		/* We don't know yet how many commits, so we're forced to
3806 		 * traverse them all. */
3807 		view->count = 0;
3808 		s->thread_args.load_all = 1;
3809 		if (!s->thread_args.log_complete)
3810 			return trigger_log_thread(view, 0);
3811 		err = log_move_cursor_down(view, s->commits->ncommits);
3812 		s->thread_args.load_all = 0;
3813 		break;
3814 	}
3815 	case CTRL('d'):
3816 	case 'd':
3817 		nscroll /= 2;
3818 		/* FALL THROUGH */
3819 	case KEY_NPAGE:
3820 	case CTRL('f'):
3821 	case 'f':
3822 	case ' ':
3823 		err = log_move_cursor_down(view, nscroll);
3824 		break;
3825 	case KEY_RESIZE:
3826 		if (s->selected > view->nlines - 2)
3827 			s->selected = view->nlines - 2;
3828 		if (s->selected > s->commits->ncommits - 1)
3829 			s->selected = s->commits->ncommits - 1;
3830 		select_commit(s);
3831 		if (s->commits->ncommits < view->nlines - 1 &&
3832 		    !s->thread_args.log_complete) {
3833 			s->thread_args.commits_needed += (view->nlines - 1) -
3834 			    s->commits->ncommits;
3835 			err = trigger_log_thread(view, 1);
3836 		}
3837 		break;
3838 	case KEY_ENTER:
3839 	case '\r':
3840 		view->count = 0;
3841 		if (s->selected_entry == NULL)
3842 			break;
3843 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3844 		break;
3845 	case 'T':
3846 		view->count = 0;
3847 		if (s->selected_entry == NULL)
3848 			break;
3849 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3850 		break;
3851 	case KEY_BACKSPACE:
3852 	case CTRL('l'):
3853 	case 'B':
3854 		view->count = 0;
3855 		if (ch == KEY_BACKSPACE &&
3856 		    got_path_is_root_dir(s->in_repo_path))
3857 			break;
3858 		err = stop_log_thread(s);
3859 		if (err)
3860 			return err;
3861 		if (ch == KEY_BACKSPACE) {
3862 			char *parent_path;
3863 			err = got_path_dirname(&parent_path, s->in_repo_path);
3864 			if (err)
3865 				return err;
3866 			free(s->in_repo_path);
3867 			s->in_repo_path = parent_path;
3868 			s->thread_args.in_repo_path = s->in_repo_path;
3869 		} else if (ch == CTRL('l')) {
3870 			struct got_object_id *start_id;
3871 			err = got_repo_match_object_id(&start_id, NULL,
3872 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3873 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3874 			if (err) {
3875 				if (s->head_ref_name == NULL ||
3876 				    err->code != GOT_ERR_NOT_REF)
3877 					return err;
3878 				/* Try to cope with deleted references. */
3879 				free(s->head_ref_name);
3880 				s->head_ref_name = NULL;
3881 				err = got_repo_match_object_id(&start_id,
3882 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3883 				    &tog_refs, s->repo);
3884 				if (err)
3885 					return err;
3886 			}
3887 			free(s->start_id);
3888 			s->start_id = start_id;
3889 			s->thread_args.start_id = s->start_id;
3890 		} else /* 'B' */
3891 			s->log_branches = !s->log_branches;
3892 
3893 		if (s->thread_args.pack_fds == NULL) {
3894 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3895 			if (err)
3896 				return err;
3897 		}
3898 		err = got_repo_open(&s->thread_args.repo,
3899 		    got_repo_get_path(s->repo), NULL,
3900 		    s->thread_args.pack_fds);
3901 		if (err)
3902 			return err;
3903 		tog_free_refs();
3904 		err = tog_load_refs(s->repo, 0);
3905 		if (err)
3906 			return err;
3907 		err = got_commit_graph_open(&s->thread_args.graph,
3908 		    s->in_repo_path, !s->log_branches);
3909 		if (err)
3910 			return err;
3911 		err = got_commit_graph_iter_start(s->thread_args.graph,
3912 		    s->start_id, s->repo, NULL, NULL);
3913 		if (err)
3914 			return err;
3915 		free_commits(&s->real_commits);
3916 		free_commits(&s->limit_commits);
3917 		s->first_displayed_entry = NULL;
3918 		s->last_displayed_entry = NULL;
3919 		s->selected_entry = NULL;
3920 		s->selected = 0;
3921 		s->thread_args.log_complete = 0;
3922 		s->quit = 0;
3923 		s->thread_args.commits_needed = view->lines;
3924 		s->matched_entry = NULL;
3925 		s->search_entry = NULL;
3926 		view->offset = 0;
3927 		break;
3928 	case 'R':
3929 		view->count = 0;
3930 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3931 		break;
3932 	default:
3933 		view->count = 0;
3934 		break;
3935 	}
3936 
3937 	return err;
3938 }
3939 
3940 static const struct got_error *
3941 apply_unveil(const char *repo_path, const char *worktree_path)
3942 {
3943 	const struct got_error *error;
3944 
3945 #ifdef PROFILE
3946 	if (unveil("gmon.out", "rwc") != 0)
3947 		return got_error_from_errno2("unveil", "gmon.out");
3948 #endif
3949 	if (repo_path && unveil(repo_path, "r") != 0)
3950 		return got_error_from_errno2("unveil", repo_path);
3951 
3952 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3953 		return got_error_from_errno2("unveil", worktree_path);
3954 
3955 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3956 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3957 
3958 	error = got_privsep_unveil_exec_helpers();
3959 	if (error != NULL)
3960 		return error;
3961 
3962 	if (unveil(NULL, NULL) != 0)
3963 		return got_error_from_errno("unveil");
3964 
3965 	return NULL;
3966 }
3967 
3968 static void
3969 init_curses(void)
3970 {
3971 	/*
3972 	 * Override default signal handlers before starting ncurses.
3973 	 * This should prevent ncurses from installing its own
3974 	 * broken cleanup() signal handler.
3975 	 */
3976 	signal(SIGWINCH, tog_sigwinch);
3977 	signal(SIGPIPE, tog_sigpipe);
3978 	signal(SIGCONT, tog_sigcont);
3979 	signal(SIGINT, tog_sigint);
3980 	signal(SIGTERM, tog_sigterm);
3981 
3982 	initscr();
3983 	cbreak();
3984 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3985 	noecho();
3986 	nonl();
3987 	intrflush(stdscr, FALSE);
3988 	keypad(stdscr, TRUE);
3989 	curs_set(0);
3990 	if (getenv("TOG_COLORS") != NULL) {
3991 		start_color();
3992 		use_default_colors();
3993 	}
3994 }
3995 
3996 static const struct got_error *
3997 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3998     struct got_repository *repo, struct got_worktree *worktree)
3999 {
4000 	const struct got_error *err = NULL;
4001 
4002 	if (argc == 0) {
4003 		*in_repo_path = strdup("/");
4004 		if (*in_repo_path == NULL)
4005 			return got_error_from_errno("strdup");
4006 		return NULL;
4007 	}
4008 
4009 	if (worktree) {
4010 		const char *prefix = got_worktree_get_path_prefix(worktree);
4011 		char *p;
4012 
4013 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4014 		if (err)
4015 			return err;
4016 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4017 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4018 		    p) == -1) {
4019 			err = got_error_from_errno("asprintf");
4020 			*in_repo_path = NULL;
4021 		}
4022 		free(p);
4023 	} else
4024 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4025 
4026 	return err;
4027 }
4028 
4029 static const struct got_error *
4030 cmd_log(int argc, char *argv[])
4031 {
4032 	const struct got_error *error;
4033 	struct got_repository *repo = NULL;
4034 	struct got_worktree *worktree = NULL;
4035 	struct got_object_id *start_id = NULL;
4036 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4037 	char *start_commit = NULL, *label = NULL;
4038 	struct got_reference *ref = NULL;
4039 	const char *head_ref_name = NULL;
4040 	int ch, log_branches = 0;
4041 	struct tog_view *view;
4042 	int *pack_fds = NULL;
4043 
4044 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4045 		switch (ch) {
4046 		case 'b':
4047 			log_branches = 1;
4048 			break;
4049 		case 'c':
4050 			start_commit = optarg;
4051 			break;
4052 		case 'r':
4053 			repo_path = realpath(optarg, NULL);
4054 			if (repo_path == NULL)
4055 				return got_error_from_errno2("realpath",
4056 				    optarg);
4057 			break;
4058 		default:
4059 			usage_log();
4060 			/* NOTREACHED */
4061 		}
4062 	}
4063 
4064 	argc -= optind;
4065 	argv += optind;
4066 
4067 	if (argc > 1)
4068 		usage_log();
4069 
4070 	error = got_repo_pack_fds_open(&pack_fds);
4071 	if (error != NULL)
4072 		goto done;
4073 
4074 	if (repo_path == NULL) {
4075 		cwd = getcwd(NULL, 0);
4076 		if (cwd == NULL)
4077 			return got_error_from_errno("getcwd");
4078 		error = got_worktree_open(&worktree, cwd);
4079 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4080 			goto done;
4081 		if (worktree)
4082 			repo_path =
4083 			    strdup(got_worktree_get_repo_path(worktree));
4084 		else
4085 			repo_path = strdup(cwd);
4086 		if (repo_path == NULL) {
4087 			error = got_error_from_errno("strdup");
4088 			goto done;
4089 		}
4090 	}
4091 
4092 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4093 	if (error != NULL)
4094 		goto done;
4095 
4096 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4097 	    repo, worktree);
4098 	if (error)
4099 		goto done;
4100 
4101 	init_curses();
4102 
4103 	error = apply_unveil(got_repo_get_path(repo),
4104 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4105 	if (error)
4106 		goto done;
4107 
4108 	/* already loaded by tog_log_with_path()? */
4109 	if (TAILQ_EMPTY(&tog_refs)) {
4110 		error = tog_load_refs(repo, 0);
4111 		if (error)
4112 			goto done;
4113 	}
4114 
4115 	if (start_commit == NULL) {
4116 		error = got_repo_match_object_id(&start_id, &label,
4117 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4118 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4119 		if (error)
4120 			goto done;
4121 		head_ref_name = label;
4122 	} else {
4123 		error = got_ref_open(&ref, repo, start_commit, 0);
4124 		if (error == NULL)
4125 			head_ref_name = got_ref_get_name(ref);
4126 		else if (error->code != GOT_ERR_NOT_REF)
4127 			goto done;
4128 		error = got_repo_match_object_id(&start_id, NULL,
4129 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4130 		if (error)
4131 			goto done;
4132 	}
4133 
4134 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4135 	if (view == NULL) {
4136 		error = got_error_from_errno("view_open");
4137 		goto done;
4138 	}
4139 	error = open_log_view(view, start_id, repo, head_ref_name,
4140 	    in_repo_path, log_branches);
4141 	if (error)
4142 		goto done;
4143 	if (worktree) {
4144 		/* Release work tree lock. */
4145 		got_worktree_close(worktree);
4146 		worktree = NULL;
4147 	}
4148 	error = view_loop(view);
4149 done:
4150 	free(in_repo_path);
4151 	free(repo_path);
4152 	free(cwd);
4153 	free(start_id);
4154 	free(label);
4155 	if (ref)
4156 		got_ref_close(ref);
4157 	if (repo) {
4158 		const struct got_error *close_err = got_repo_close(repo);
4159 		if (error == NULL)
4160 			error = close_err;
4161 	}
4162 	if (worktree)
4163 		got_worktree_close(worktree);
4164 	if (pack_fds) {
4165 		const struct got_error *pack_err =
4166 		    got_repo_pack_fds_close(pack_fds);
4167 		if (error == NULL)
4168 			error = pack_err;
4169 	}
4170 	tog_free_refs();
4171 	return error;
4172 }
4173 
4174 __dead static void
4175 usage_diff(void)
4176 {
4177 	endwin();
4178 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4179 	    "object1 object2\n", getprogname());
4180 	exit(1);
4181 }
4182 
4183 static int
4184 match_line(const char *line, regex_t *regex, size_t nmatch,
4185     regmatch_t *regmatch)
4186 {
4187 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4188 }
4189 
4190 static struct tog_color *
4191 match_color(struct tog_colors *colors, const char *line)
4192 {
4193 	struct tog_color *tc = NULL;
4194 
4195 	STAILQ_FOREACH(tc, colors, entry) {
4196 		if (match_line(line, &tc->regex, 0, NULL))
4197 			return tc;
4198 	}
4199 
4200 	return NULL;
4201 }
4202 
4203 static const struct got_error *
4204 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4205     WINDOW *window, int skipcol, regmatch_t *regmatch)
4206 {
4207 	const struct got_error *err = NULL;
4208 	char *exstr = NULL;
4209 	wchar_t *wline = NULL;
4210 	int rme, rms, n, width, scrollx;
4211 	int width0 = 0, width1 = 0, width2 = 0;
4212 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4213 
4214 	*wtotal = 0;
4215 
4216 	rms = regmatch->rm_so;
4217 	rme = regmatch->rm_eo;
4218 
4219 	err = expand_tab(&exstr, line);
4220 	if (err)
4221 		return err;
4222 
4223 	/* Split the line into 3 segments, according to match offsets. */
4224 	seg0 = strndup(exstr, rms);
4225 	if (seg0 == NULL) {
4226 		err = got_error_from_errno("strndup");
4227 		goto done;
4228 	}
4229 	seg1 = strndup(exstr + rms, rme - rms);
4230 	if (seg1 == NULL) {
4231 		err = got_error_from_errno("strndup");
4232 		goto done;
4233 	}
4234 	seg2 = strdup(exstr + rme);
4235 	if (seg2 == NULL) {
4236 		err = got_error_from_errno("strndup");
4237 		goto done;
4238 	}
4239 
4240 	/* draw up to matched token if we haven't scrolled past it */
4241 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4242 	    col_tab_align, 1);
4243 	if (err)
4244 		goto done;
4245 	n = MAX(width0 - skipcol, 0);
4246 	if (n) {
4247 		free(wline);
4248 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4249 		    wlimit, col_tab_align, 1);
4250 		if (err)
4251 			goto done;
4252 		waddwstr(window, &wline[scrollx]);
4253 		wlimit -= width;
4254 		*wtotal += width;
4255 	}
4256 
4257 	if (wlimit > 0) {
4258 		int i = 0, w = 0;
4259 		size_t wlen;
4260 
4261 		free(wline);
4262 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4263 		    col_tab_align, 1);
4264 		if (err)
4265 			goto done;
4266 		wlen = wcslen(wline);
4267 		while (i < wlen) {
4268 			width = wcwidth(wline[i]);
4269 			if (width == -1) {
4270 				/* should not happen, tabs are expanded */
4271 				err = got_error(GOT_ERR_RANGE);
4272 				goto done;
4273 			}
4274 			if (width0 + w + width > skipcol)
4275 				break;
4276 			w += width;
4277 			i++;
4278 		}
4279 		/* draw (visible part of) matched token (if scrolled into it) */
4280 		if (width1 - w > 0) {
4281 			wattron(window, A_STANDOUT);
4282 			waddwstr(window, &wline[i]);
4283 			wattroff(window, A_STANDOUT);
4284 			wlimit -= (width1 - w);
4285 			*wtotal += (width1 - w);
4286 		}
4287 	}
4288 
4289 	if (wlimit > 0) {  /* draw rest of line */
4290 		free(wline);
4291 		if (skipcol > width0 + width1) {
4292 			err = format_line(&wline, &width2, &scrollx, seg2,
4293 			    skipcol - (width0 + width1), wlimit,
4294 			    col_tab_align, 1);
4295 			if (err)
4296 				goto done;
4297 			waddwstr(window, &wline[scrollx]);
4298 		} else {
4299 			err = format_line(&wline, &width2, NULL, seg2, 0,
4300 			    wlimit, col_tab_align, 1);
4301 			if (err)
4302 				goto done;
4303 			waddwstr(window, wline);
4304 		}
4305 		*wtotal += width2;
4306 	}
4307 done:
4308 	free(wline);
4309 	free(exstr);
4310 	free(seg0);
4311 	free(seg1);
4312 	free(seg2);
4313 	return err;
4314 }
4315 
4316 static int
4317 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4318 {
4319 	FILE	*f = NULL;
4320 	int	*eof, *first, *selected;
4321 
4322 	if (view->type == TOG_VIEW_DIFF) {
4323 		struct tog_diff_view_state *s = &view->state.diff;
4324 
4325 		first = &s->first_displayed_line;
4326 		selected = first;
4327 		eof = &s->eof;
4328 		f = s->f;
4329 	} else if (view->type == TOG_VIEW_HELP) {
4330 		struct tog_help_view_state *s = &view->state.help;
4331 
4332 		first = &s->first_displayed_line;
4333 		selected = first;
4334 		eof = &s->eof;
4335 		f = s->f;
4336 	} else if (view->type == TOG_VIEW_BLAME) {
4337 		struct tog_blame_view_state *s = &view->state.blame;
4338 
4339 		first = &s->first_displayed_line;
4340 		selected = &s->selected_line;
4341 		eof = &s->eof;
4342 		f = s->blame.f;
4343 	} else
4344 		return 0;
4345 
4346 	/* Center gline in the middle of the page like vi(1). */
4347 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4348 		return 0;
4349 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4350 		rewind(f);
4351 		*eof = 0;
4352 		*first = 1;
4353 		*lineno = 0;
4354 		*nprinted = 0;
4355 		return 0;
4356 	}
4357 
4358 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4359 		view->gline : (view->nlines - 3) / 2 + 1;
4360 	view->gline = 0;
4361 
4362 	return 1;
4363 }
4364 
4365 static const struct got_error *
4366 draw_file(struct tog_view *view, const char *header)
4367 {
4368 	struct tog_diff_view_state *s = &view->state.diff;
4369 	regmatch_t *regmatch = &view->regmatch;
4370 	const struct got_error *err;
4371 	int nprinted = 0;
4372 	char *line;
4373 	size_t linesize = 0;
4374 	ssize_t linelen;
4375 	wchar_t *wline;
4376 	int width;
4377 	int max_lines = view->nlines;
4378 	int nlines = s->nlines;
4379 	off_t line_offset;
4380 
4381 	s->lineno = s->first_displayed_line - 1;
4382 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4383 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4384 		return got_error_from_errno("fseek");
4385 
4386 	werase(view->window);
4387 
4388 	if (view->gline > s->nlines - 1)
4389 		view->gline = s->nlines - 1;
4390 
4391 	if (header) {
4392 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4393 		    1 : view->gline - (view->nlines - 3) / 2 :
4394 		    s->lineno + s->selected_line;
4395 
4396 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4397 			return got_error_from_errno("asprintf");
4398 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4399 		    0, 0);
4400 		free(line);
4401 		if (err)
4402 			return err;
4403 
4404 		if (view_needs_focus_indication(view))
4405 			wstandout(view->window);
4406 		waddwstr(view->window, wline);
4407 		free(wline);
4408 		wline = NULL;
4409 		while (width++ < view->ncols)
4410 			waddch(view->window, ' ');
4411 		if (view_needs_focus_indication(view))
4412 			wstandend(view->window);
4413 
4414 		if (max_lines <= 1)
4415 			return NULL;
4416 		max_lines--;
4417 	}
4418 
4419 	s->eof = 0;
4420 	view->maxx = 0;
4421 	line = NULL;
4422 	while (max_lines > 0 && nprinted < max_lines) {
4423 		enum got_diff_line_type linetype;
4424 		attr_t attr = 0;
4425 
4426 		linelen = getline(&line, &linesize, s->f);
4427 		if (linelen == -1) {
4428 			if (feof(s->f)) {
4429 				s->eof = 1;
4430 				break;
4431 			}
4432 			free(line);
4433 			return got_ferror(s->f, GOT_ERR_IO);
4434 		}
4435 
4436 		if (++s->lineno < s->first_displayed_line)
4437 			continue;
4438 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4439 			continue;
4440 		if (s->lineno == view->hiline)
4441 			attr = A_STANDOUT;
4442 
4443 		/* Set view->maxx based on full line length. */
4444 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4445 		    view->x ? 1 : 0);
4446 		if (err) {
4447 			free(line);
4448 			return err;
4449 		}
4450 		view->maxx = MAX(view->maxx, width);
4451 		free(wline);
4452 		wline = NULL;
4453 
4454 		linetype = s->lines[s->lineno].type;
4455 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4456 		    linetype < GOT_DIFF_LINE_CONTEXT)
4457 			attr |= COLOR_PAIR(linetype);
4458 		if (attr)
4459 			wattron(view->window, attr);
4460 		if (s->first_displayed_line + nprinted == s->matched_line &&
4461 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4462 			err = add_matched_line(&width, line, view->ncols, 0,
4463 			    view->window, view->x, regmatch);
4464 			if (err) {
4465 				free(line);
4466 				return err;
4467 			}
4468 		} else {
4469 			int skip;
4470 			err = format_line(&wline, &width, &skip, line,
4471 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4472 			if (err) {
4473 				free(line);
4474 				return err;
4475 			}
4476 			waddwstr(view->window, &wline[skip]);
4477 			free(wline);
4478 			wline = NULL;
4479 		}
4480 		if (s->lineno == view->hiline) {
4481 			/* highlight full gline length */
4482 			while (width++ < view->ncols)
4483 				waddch(view->window, ' ');
4484 		} else {
4485 			if (width <= view->ncols - 1)
4486 				waddch(view->window, '\n');
4487 		}
4488 		if (attr)
4489 			wattroff(view->window, attr);
4490 		if (++nprinted == 1)
4491 			s->first_displayed_line = s->lineno;
4492 	}
4493 	free(line);
4494 	if (nprinted >= 1)
4495 		s->last_displayed_line = s->first_displayed_line +
4496 		    (nprinted - 1);
4497 	else
4498 		s->last_displayed_line = s->first_displayed_line;
4499 
4500 	view_border(view);
4501 
4502 	if (s->eof) {
4503 		while (nprinted < view->nlines) {
4504 			waddch(view->window, '\n');
4505 			nprinted++;
4506 		}
4507 
4508 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4509 		    view->ncols, 0, 0);
4510 		if (err) {
4511 			return err;
4512 		}
4513 
4514 		wstandout(view->window);
4515 		waddwstr(view->window, wline);
4516 		free(wline);
4517 		wline = NULL;
4518 		wstandend(view->window);
4519 	}
4520 
4521 	return NULL;
4522 }
4523 
4524 static char *
4525 get_datestr(time_t *time, char *datebuf)
4526 {
4527 	struct tm mytm, *tm;
4528 	char *p, *s;
4529 
4530 	tm = gmtime_r(time, &mytm);
4531 	if (tm == NULL)
4532 		return NULL;
4533 	s = asctime_r(tm, datebuf);
4534 	if (s == NULL)
4535 		return NULL;
4536 	p = strchr(s, '\n');
4537 	if (p)
4538 		*p = '\0';
4539 	return s;
4540 }
4541 
4542 static const struct got_error *
4543 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4544     off_t off, uint8_t type)
4545 {
4546 	struct got_diff_line *p;
4547 
4548 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4549 	if (p == NULL)
4550 		return got_error_from_errno("reallocarray");
4551 	*lines = p;
4552 	(*lines)[*nlines].offset = off;
4553 	(*lines)[*nlines].type = type;
4554 	(*nlines)++;
4555 
4556 	return NULL;
4557 }
4558 
4559 static const struct got_error *
4560 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4561     struct got_diff_line *s_lines, size_t s_nlines)
4562 {
4563 	struct got_diff_line	*p;
4564 	char			 buf[BUFSIZ];
4565 	size_t			 i, r;
4566 
4567 	if (fseeko(src, 0L, SEEK_SET) == -1)
4568 		return got_error_from_errno("fseeko");
4569 
4570 	for (;;) {
4571 		r = fread(buf, 1, sizeof(buf), src);
4572 		if (r == 0) {
4573 			if (ferror(src))
4574 				return got_error_from_errno("fread");
4575 			if (feof(src))
4576 				break;
4577 		}
4578 		if (fwrite(buf, 1, r, dst) != r)
4579 			return got_ferror(dst, GOT_ERR_IO);
4580 	}
4581 
4582 	if (s_nlines == 0 && *d_nlines == 0)
4583 		return NULL;
4584 
4585 	/*
4586 	 * If commit info was in dst, increment line offsets
4587 	 * of the appended diff content, but skip s_lines[0]
4588 	 * because offset zero is already in *d_lines.
4589 	 */
4590 	if (*d_nlines > 0) {
4591 		for (i = 1; i < s_nlines; ++i)
4592 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4593 
4594 		if (s_nlines > 0) {
4595 			--s_nlines;
4596 			++s_lines;
4597 		}
4598 	}
4599 
4600 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4601 	if (p == NULL) {
4602 		/* d_lines is freed in close_diff_view() */
4603 		return got_error_from_errno("reallocarray");
4604 	}
4605 
4606 	*d_lines = p;
4607 
4608 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4609 	*d_nlines += s_nlines;
4610 
4611 	return NULL;
4612 }
4613 
4614 static const struct got_error *
4615 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4616     struct got_object_id *commit_id, struct got_reflist_head *refs,
4617     struct got_repository *repo, int ignore_ws, int force_text_diff,
4618     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4619 {
4620 	const struct got_error *err = NULL;
4621 	char datebuf[26], *datestr;
4622 	struct got_commit_object *commit;
4623 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4624 	time_t committer_time;
4625 	const char *author, *committer;
4626 	char *refs_str = NULL;
4627 	struct got_pathlist_entry *pe;
4628 	off_t outoff = 0;
4629 	int n;
4630 
4631 	if (refs) {
4632 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4633 		if (err)
4634 			return err;
4635 	}
4636 
4637 	err = got_object_open_as_commit(&commit, repo, commit_id);
4638 	if (err)
4639 		return err;
4640 
4641 	err = got_object_id_str(&id_str, commit_id);
4642 	if (err) {
4643 		err = got_error_from_errno("got_object_id_str");
4644 		goto done;
4645 	}
4646 
4647 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4648 	if (err)
4649 		goto done;
4650 
4651 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4652 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4653 	if (n < 0) {
4654 		err = got_error_from_errno("fprintf");
4655 		goto done;
4656 	}
4657 	outoff += n;
4658 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4659 	if (err)
4660 		goto done;
4661 
4662 	n = fprintf(outfile, "from: %s\n",
4663 	    got_object_commit_get_author(commit));
4664 	if (n < 0) {
4665 		err = got_error_from_errno("fprintf");
4666 		goto done;
4667 	}
4668 	outoff += n;
4669 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4670 	if (err)
4671 		goto done;
4672 
4673 	author = got_object_commit_get_author(commit);
4674 	committer = got_object_commit_get_committer(commit);
4675 	if (strcmp(author, committer) != 0) {
4676 		n = fprintf(outfile, "via: %s\n", committer);
4677 		if (n < 0) {
4678 			err = got_error_from_errno("fprintf");
4679 			goto done;
4680 		}
4681 		outoff += n;
4682 		err = add_line_metadata(lines, nlines, outoff,
4683 		    GOT_DIFF_LINE_AUTHOR);
4684 		if (err)
4685 			goto done;
4686 	}
4687 	committer_time = got_object_commit_get_committer_time(commit);
4688 	datestr = get_datestr(&committer_time, datebuf);
4689 	if (datestr) {
4690 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4691 		if (n < 0) {
4692 			err = got_error_from_errno("fprintf");
4693 			goto done;
4694 		}
4695 		outoff += n;
4696 		err = add_line_metadata(lines, nlines, outoff,
4697 		    GOT_DIFF_LINE_DATE);
4698 		if (err)
4699 			goto done;
4700 	}
4701 	if (got_object_commit_get_nparents(commit) > 1) {
4702 		const struct got_object_id_queue *parent_ids;
4703 		struct got_object_qid *qid;
4704 		int pn = 1;
4705 		parent_ids = got_object_commit_get_parent_ids(commit);
4706 		STAILQ_FOREACH(qid, parent_ids, entry) {
4707 			err = got_object_id_str(&id_str, &qid->id);
4708 			if (err)
4709 				goto done;
4710 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4711 			if (n < 0) {
4712 				err = got_error_from_errno("fprintf");
4713 				goto done;
4714 			}
4715 			outoff += n;
4716 			err = add_line_metadata(lines, nlines, outoff,
4717 			    GOT_DIFF_LINE_META);
4718 			if (err)
4719 				goto done;
4720 			free(id_str);
4721 			id_str = NULL;
4722 		}
4723 	}
4724 
4725 	err = got_object_commit_get_logmsg(&logmsg, commit);
4726 	if (err)
4727 		goto done;
4728 	s = logmsg;
4729 	while ((line = strsep(&s, "\n")) != NULL) {
4730 		n = fprintf(outfile, "%s\n", line);
4731 		if (n < 0) {
4732 			err = got_error_from_errno("fprintf");
4733 			goto done;
4734 		}
4735 		outoff += n;
4736 		err = add_line_metadata(lines, nlines, outoff,
4737 		    GOT_DIFF_LINE_LOGMSG);
4738 		if (err)
4739 			goto done;
4740 	}
4741 
4742 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4743 		struct got_diff_changed_path *cp = pe->data;
4744 		int pad = dsa->max_path_len - pe->path_len + 1;
4745 
4746 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4747 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4748 		    dsa->rm_cols + 1, cp->rm);
4749 		if (n < 0) {
4750 			err = got_error_from_errno("fprintf");
4751 			goto done;
4752 		}
4753 		outoff += n;
4754 		err = add_line_metadata(lines, nlines, outoff,
4755 		    GOT_DIFF_LINE_CHANGES);
4756 		if (err)
4757 			goto done;
4758 	}
4759 
4760 	fputc('\n', outfile);
4761 	outoff++;
4762 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4763 	if (err)
4764 		goto done;
4765 
4766 	n = fprintf(outfile,
4767 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4768 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4769 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4770 	if (n < 0) {
4771 		err = got_error_from_errno("fprintf");
4772 		goto done;
4773 	}
4774 	outoff += n;
4775 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4776 	if (err)
4777 		goto done;
4778 
4779 	fputc('\n', outfile);
4780 	outoff++;
4781 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4782 done:
4783 	free(id_str);
4784 	free(logmsg);
4785 	free(refs_str);
4786 	got_object_commit_close(commit);
4787 	if (err) {
4788 		free(*lines);
4789 		*lines = NULL;
4790 		*nlines = 0;
4791 	}
4792 	return err;
4793 }
4794 
4795 static const struct got_error *
4796 create_diff(struct tog_diff_view_state *s)
4797 {
4798 	const struct got_error *err = NULL;
4799 	FILE *f = NULL, *tmp_diff_file = NULL;
4800 	int obj_type;
4801 	struct got_diff_line *lines = NULL;
4802 	struct got_pathlist_head changed_paths;
4803 
4804 	TAILQ_INIT(&changed_paths);
4805 
4806 	free(s->lines);
4807 	s->lines = malloc(sizeof(*s->lines));
4808 	if (s->lines == NULL)
4809 		return got_error_from_errno("malloc");
4810 	s->nlines = 0;
4811 
4812 	f = got_opentemp();
4813 	if (f == NULL) {
4814 		err = got_error_from_errno("got_opentemp");
4815 		goto done;
4816 	}
4817 	tmp_diff_file = got_opentemp();
4818 	if (tmp_diff_file == NULL) {
4819 		err = got_error_from_errno("got_opentemp");
4820 		goto done;
4821 	}
4822 	if (s->f && fclose(s->f) == EOF) {
4823 		err = got_error_from_errno("fclose");
4824 		goto done;
4825 	}
4826 	s->f = f;
4827 
4828 	if (s->id1)
4829 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4830 	else
4831 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4832 	if (err)
4833 		goto done;
4834 
4835 	switch (obj_type) {
4836 	case GOT_OBJ_TYPE_BLOB:
4837 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4838 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4839 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4840 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4841 		    s->f);
4842 		break;
4843 	case GOT_OBJ_TYPE_TREE:
4844 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4845 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4846 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4847 		    s->force_text_diff, NULL, s->repo, s->f);
4848 		break;
4849 	case GOT_OBJ_TYPE_COMMIT: {
4850 		const struct got_object_id_queue *parent_ids;
4851 		struct got_object_qid *pid;
4852 		struct got_commit_object *commit2;
4853 		struct got_reflist_head *refs;
4854 		size_t nlines = 0;
4855 		struct got_diffstat_cb_arg dsa = {
4856 			0, 0, 0, 0, 0, 0,
4857 			&changed_paths,
4858 			s->ignore_whitespace,
4859 			s->force_text_diff,
4860 			tog_diff_algo
4861 		};
4862 
4863 		lines = malloc(sizeof(*lines));
4864 		if (lines == NULL) {
4865 			err = got_error_from_errno("malloc");
4866 			goto done;
4867 		}
4868 
4869 		/* build diff first in tmp file then append to commit info */
4870 		err = got_diff_objects_as_commits(&lines, &nlines,
4871 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4872 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4873 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4874 		if (err)
4875 			break;
4876 
4877 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4878 		if (err)
4879 			goto done;
4880 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4881 		/* Show commit info if we're diffing to a parent/root commit. */
4882 		if (s->id1 == NULL) {
4883 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4884 			    refs, s->repo, s->ignore_whitespace,
4885 			    s->force_text_diff, &dsa, s->f);
4886 			if (err)
4887 				goto done;
4888 		} else {
4889 			parent_ids = got_object_commit_get_parent_ids(commit2);
4890 			STAILQ_FOREACH(pid, parent_ids, entry) {
4891 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4892 					err = write_commit_info(&s->lines,
4893 					    &s->nlines, s->id2, refs, s->repo,
4894 					    s->ignore_whitespace,
4895 					    s->force_text_diff, &dsa, s->f);
4896 					if (err)
4897 						goto done;
4898 					break;
4899 				}
4900 			}
4901 		}
4902 		got_object_commit_close(commit2);
4903 
4904 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4905 		    lines, nlines);
4906 		break;
4907 	}
4908 	default:
4909 		err = got_error(GOT_ERR_OBJ_TYPE);
4910 		break;
4911 	}
4912 done:
4913 	free(lines);
4914 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4915 	if (s->f && fflush(s->f) != 0 && err == NULL)
4916 		err = got_error_from_errno("fflush");
4917 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4918 		err = got_error_from_errno("fclose");
4919 	return err;
4920 }
4921 
4922 static void
4923 diff_view_indicate_progress(struct tog_view *view)
4924 {
4925 	mvwaddstr(view->window, 0, 0, "diffing...");
4926 	update_panels();
4927 	doupdate();
4928 }
4929 
4930 static const struct got_error *
4931 search_start_diff_view(struct tog_view *view)
4932 {
4933 	struct tog_diff_view_state *s = &view->state.diff;
4934 
4935 	s->matched_line = 0;
4936 	return NULL;
4937 }
4938 
4939 static void
4940 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4941     size_t *nlines, int **first, int **last, int **match, int **selected)
4942 {
4943 	struct tog_diff_view_state *s = &view->state.diff;
4944 
4945 	*f = s->f;
4946 	*nlines = s->nlines;
4947 	*line_offsets = NULL;
4948 	*match = &s->matched_line;
4949 	*first = &s->first_displayed_line;
4950 	*last = &s->last_displayed_line;
4951 	*selected = &s->selected_line;
4952 }
4953 
4954 static const struct got_error *
4955 search_next_view_match(struct tog_view *view)
4956 {
4957 	const struct got_error *err = NULL;
4958 	FILE *f;
4959 	int lineno;
4960 	char *line = NULL;
4961 	size_t linesize = 0;
4962 	ssize_t linelen;
4963 	off_t *line_offsets;
4964 	size_t nlines = 0;
4965 	int *first, *last, *match, *selected;
4966 
4967 	if (!view->search_setup)
4968 		return got_error_msg(GOT_ERR_NOT_IMPL,
4969 		    "view search not supported");
4970 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4971 	    &match, &selected);
4972 
4973 	if (!view->searching) {
4974 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4975 		return NULL;
4976 	}
4977 
4978 	if (*match) {
4979 		if (view->searching == TOG_SEARCH_FORWARD)
4980 			lineno = *match + 1;
4981 		else
4982 			lineno = *match - 1;
4983 	} else
4984 		lineno = *first - 1 + *selected;
4985 
4986 	while (1) {
4987 		off_t offset;
4988 
4989 		if (lineno <= 0 || lineno > nlines) {
4990 			if (*match == 0) {
4991 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4992 				break;
4993 			}
4994 
4995 			if (view->searching == TOG_SEARCH_FORWARD)
4996 				lineno = 1;
4997 			else
4998 				lineno = nlines;
4999 		}
5000 
5001 		offset = view->type == TOG_VIEW_DIFF ?
5002 		    view->state.diff.lines[lineno - 1].offset :
5003 		    line_offsets[lineno - 1];
5004 		if (fseeko(f, offset, SEEK_SET) != 0) {
5005 			free(line);
5006 			return got_error_from_errno("fseeko");
5007 		}
5008 		linelen = getline(&line, &linesize, f);
5009 		if (linelen != -1) {
5010 			char *exstr;
5011 			err = expand_tab(&exstr, line);
5012 			if (err)
5013 				break;
5014 			if (match_line(exstr, &view->regex, 1,
5015 			    &view->regmatch)) {
5016 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5017 				*match = lineno;
5018 				free(exstr);
5019 				break;
5020 			}
5021 			free(exstr);
5022 		}
5023 		if (view->searching == TOG_SEARCH_FORWARD)
5024 			lineno++;
5025 		else
5026 			lineno--;
5027 	}
5028 	free(line);
5029 
5030 	if (*match) {
5031 		*first = *match;
5032 		*selected = 1;
5033 	}
5034 
5035 	return err;
5036 }
5037 
5038 static const struct got_error *
5039 close_diff_view(struct tog_view *view)
5040 {
5041 	const struct got_error *err = NULL;
5042 	struct tog_diff_view_state *s = &view->state.diff;
5043 
5044 	free(s->id1);
5045 	s->id1 = NULL;
5046 	free(s->id2);
5047 	s->id2 = NULL;
5048 	if (s->f && fclose(s->f) == EOF)
5049 		err = got_error_from_errno("fclose");
5050 	s->f = NULL;
5051 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5052 		err = got_error_from_errno("fclose");
5053 	s->f1 = NULL;
5054 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5055 		err = got_error_from_errno("fclose");
5056 	s->f2 = NULL;
5057 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5058 		err = got_error_from_errno("close");
5059 	s->fd1 = -1;
5060 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5061 		err = got_error_from_errno("close");
5062 	s->fd2 = -1;
5063 	free(s->lines);
5064 	s->lines = NULL;
5065 	s->nlines = 0;
5066 	return err;
5067 }
5068 
5069 static const struct got_error *
5070 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5071     struct got_object_id *id2, const char *label1, const char *label2,
5072     int diff_context, int ignore_whitespace, int force_text_diff,
5073     struct tog_view *parent_view, struct got_repository *repo)
5074 {
5075 	const struct got_error *err;
5076 	struct tog_diff_view_state *s = &view->state.diff;
5077 
5078 	memset(s, 0, sizeof(*s));
5079 	s->fd1 = -1;
5080 	s->fd2 = -1;
5081 
5082 	if (id1 != NULL && id2 != NULL) {
5083 	    int type1, type2;
5084 	    err = got_object_get_type(&type1, repo, id1);
5085 	    if (err)
5086 		return err;
5087 	    err = got_object_get_type(&type2, repo, id2);
5088 	    if (err)
5089 		return err;
5090 
5091 	    if (type1 != type2)
5092 		return got_error(GOT_ERR_OBJ_TYPE);
5093 	}
5094 	s->first_displayed_line = 1;
5095 	s->last_displayed_line = view->nlines;
5096 	s->selected_line = 1;
5097 	s->repo = repo;
5098 	s->id1 = id1;
5099 	s->id2 = id2;
5100 	s->label1 = label1;
5101 	s->label2 = label2;
5102 
5103 	if (id1) {
5104 		s->id1 = got_object_id_dup(id1);
5105 		if (s->id1 == NULL)
5106 			return got_error_from_errno("got_object_id_dup");
5107 	} else
5108 		s->id1 = NULL;
5109 
5110 	s->id2 = got_object_id_dup(id2);
5111 	if (s->id2 == NULL) {
5112 		err = got_error_from_errno("got_object_id_dup");
5113 		goto done;
5114 	}
5115 
5116 	s->f1 = got_opentemp();
5117 	if (s->f1 == NULL) {
5118 		err = got_error_from_errno("got_opentemp");
5119 		goto done;
5120 	}
5121 
5122 	s->f2 = got_opentemp();
5123 	if (s->f2 == NULL) {
5124 		err = got_error_from_errno("got_opentemp");
5125 		goto done;
5126 	}
5127 
5128 	s->fd1 = got_opentempfd();
5129 	if (s->fd1 == -1) {
5130 		err = got_error_from_errno("got_opentempfd");
5131 		goto done;
5132 	}
5133 
5134 	s->fd2 = got_opentempfd();
5135 	if (s->fd2 == -1) {
5136 		err = got_error_from_errno("got_opentempfd");
5137 		goto done;
5138 	}
5139 
5140 	s->diff_context = diff_context;
5141 	s->ignore_whitespace = ignore_whitespace;
5142 	s->force_text_diff = force_text_diff;
5143 	s->parent_view = parent_view;
5144 	s->repo = repo;
5145 
5146 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5147 		int rc;
5148 
5149 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5150 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5151 		if (rc != ERR)
5152 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5153 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5154 		if (rc != ERR)
5155 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5156 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5157 		if (rc != ERR)
5158 			rc = init_pair(GOT_DIFF_LINE_META,
5159 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5160 		if (rc != ERR)
5161 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5162 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5163 		if (rc != ERR)
5164 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5165 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5166 		if (rc != ERR)
5167 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5168 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5169 		if (rc != ERR)
5170 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5171 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5172 		if (rc != ERR)
5173 			rc = init_pair(GOT_DIFF_LINE_DATE,
5174 			    get_color_value("TOG_COLOR_DATE"), -1);
5175 		if (rc == ERR) {
5176 			err = got_error(GOT_ERR_RANGE);
5177 			goto done;
5178 		}
5179 	}
5180 
5181 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5182 	    view_is_splitscreen(view))
5183 		show_log_view(parent_view); /* draw border */
5184 	diff_view_indicate_progress(view);
5185 
5186 	err = create_diff(s);
5187 
5188 	view->show = show_diff_view;
5189 	view->input = input_diff_view;
5190 	view->reset = reset_diff_view;
5191 	view->close = close_diff_view;
5192 	view->search_start = search_start_diff_view;
5193 	view->search_setup = search_setup_diff_view;
5194 	view->search_next = search_next_view_match;
5195 done:
5196 	if (err)
5197 		close_diff_view(view);
5198 	return err;
5199 }
5200 
5201 static const struct got_error *
5202 show_diff_view(struct tog_view *view)
5203 {
5204 	const struct got_error *err;
5205 	struct tog_diff_view_state *s = &view->state.diff;
5206 	char *id_str1 = NULL, *id_str2, *header;
5207 	const char *label1, *label2;
5208 
5209 	if (s->id1) {
5210 		err = got_object_id_str(&id_str1, s->id1);
5211 		if (err)
5212 			return err;
5213 		label1 = s->label1 ? s->label1 : id_str1;
5214 	} else
5215 		label1 = "/dev/null";
5216 
5217 	err = got_object_id_str(&id_str2, s->id2);
5218 	if (err)
5219 		return err;
5220 	label2 = s->label2 ? s->label2 : id_str2;
5221 
5222 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5223 		err = got_error_from_errno("asprintf");
5224 		free(id_str1);
5225 		free(id_str2);
5226 		return err;
5227 	}
5228 	free(id_str1);
5229 	free(id_str2);
5230 
5231 	err = draw_file(view, header);
5232 	free(header);
5233 	return err;
5234 }
5235 
5236 static const struct got_error *
5237 set_selected_commit(struct tog_diff_view_state *s,
5238     struct commit_queue_entry *entry)
5239 {
5240 	const struct got_error *err;
5241 	const struct got_object_id_queue *parent_ids;
5242 	struct got_commit_object *selected_commit;
5243 	struct got_object_qid *pid;
5244 
5245 	free(s->id2);
5246 	s->id2 = got_object_id_dup(entry->id);
5247 	if (s->id2 == NULL)
5248 		return got_error_from_errno("got_object_id_dup");
5249 
5250 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5251 	if (err)
5252 		return err;
5253 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5254 	free(s->id1);
5255 	pid = STAILQ_FIRST(parent_ids);
5256 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5257 	got_object_commit_close(selected_commit);
5258 	return NULL;
5259 }
5260 
5261 static const struct got_error *
5262 reset_diff_view(struct tog_view *view)
5263 {
5264 	struct tog_diff_view_state *s = &view->state.diff;
5265 
5266 	view->count = 0;
5267 	wclear(view->window);
5268 	s->first_displayed_line = 1;
5269 	s->last_displayed_line = view->nlines;
5270 	s->matched_line = 0;
5271 	diff_view_indicate_progress(view);
5272 	return create_diff(s);
5273 }
5274 
5275 static void
5276 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5277 {
5278 	int start, i;
5279 
5280 	i = start = s->first_displayed_line - 1;
5281 
5282 	while (s->lines[i].type != type) {
5283 		if (i == 0)
5284 			i = s->nlines - 1;
5285 		if (--i == start)
5286 			return; /* do nothing, requested type not in file */
5287 	}
5288 
5289 	s->selected_line = 1;
5290 	s->first_displayed_line = i;
5291 }
5292 
5293 static void
5294 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5295 {
5296 	int start, i;
5297 
5298 	i = start = s->first_displayed_line + 1;
5299 
5300 	while (s->lines[i].type != type) {
5301 		if (i == s->nlines - 1)
5302 			i = 0;
5303 		if (++i == start)
5304 			return; /* do nothing, requested type not in file */
5305 	}
5306 
5307 	s->selected_line = 1;
5308 	s->first_displayed_line = i;
5309 }
5310 
5311 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5312     int, int, int);
5313 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5314     int, int);
5315 
5316 static const struct got_error *
5317 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5318 {
5319 	const struct got_error *err = NULL;
5320 	struct tog_diff_view_state *s = &view->state.diff;
5321 	struct tog_log_view_state *ls;
5322 	struct commit_queue_entry *old_selected_entry;
5323 	char *line = NULL;
5324 	size_t linesize = 0;
5325 	ssize_t linelen;
5326 	int i, nscroll = view->nlines - 1, up = 0;
5327 
5328 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5329 
5330 	switch (ch) {
5331 	case '0':
5332 	case '$':
5333 	case KEY_RIGHT:
5334 	case 'l':
5335 	case KEY_LEFT:
5336 	case 'h':
5337 		horizontal_scroll_input(view, ch);
5338 		break;
5339 	case 'a':
5340 	case 'w':
5341 		if (ch == 'a') {
5342 			s->force_text_diff = !s->force_text_diff;
5343 			view->action = s->force_text_diff ?
5344 			    "force ASCII text enabled" :
5345 			    "force ASCII text disabled";
5346 		}
5347 		else if (ch == 'w') {
5348 			s->ignore_whitespace = !s->ignore_whitespace;
5349 			view->action = s->ignore_whitespace ?
5350 			    "ignore whitespace enabled" :
5351 			    "ignore whitespace disabled";
5352 		}
5353 		err = reset_diff_view(view);
5354 		break;
5355 	case 'g':
5356 	case KEY_HOME:
5357 		s->first_displayed_line = 1;
5358 		view->count = 0;
5359 		break;
5360 	case 'G':
5361 	case KEY_END:
5362 		view->count = 0;
5363 		if (s->eof)
5364 			break;
5365 
5366 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5367 		s->eof = 1;
5368 		break;
5369 	case 'k':
5370 	case KEY_UP:
5371 	case CTRL('p'):
5372 		if (s->first_displayed_line > 1)
5373 			s->first_displayed_line--;
5374 		else
5375 			view->count = 0;
5376 		break;
5377 	case CTRL('u'):
5378 	case 'u':
5379 		nscroll /= 2;
5380 		/* FALL THROUGH */
5381 	case KEY_PPAGE:
5382 	case CTRL('b'):
5383 	case 'b':
5384 		if (s->first_displayed_line == 1) {
5385 			view->count = 0;
5386 			break;
5387 		}
5388 		i = 0;
5389 		while (i++ < nscroll && s->first_displayed_line > 1)
5390 			s->first_displayed_line--;
5391 		break;
5392 	case 'j':
5393 	case KEY_DOWN:
5394 	case CTRL('n'):
5395 		if (!s->eof)
5396 			s->first_displayed_line++;
5397 		else
5398 			view->count = 0;
5399 		break;
5400 	case CTRL('d'):
5401 	case 'd':
5402 		nscroll /= 2;
5403 		/* FALL THROUGH */
5404 	case KEY_NPAGE:
5405 	case CTRL('f'):
5406 	case 'f':
5407 	case ' ':
5408 		if (s->eof) {
5409 			view->count = 0;
5410 			break;
5411 		}
5412 		i = 0;
5413 		while (!s->eof && i++ < nscroll) {
5414 			linelen = getline(&line, &linesize, s->f);
5415 			s->first_displayed_line++;
5416 			if (linelen == -1) {
5417 				if (feof(s->f)) {
5418 					s->eof = 1;
5419 				} else
5420 					err = got_ferror(s->f, GOT_ERR_IO);
5421 				break;
5422 			}
5423 		}
5424 		free(line);
5425 		break;
5426 	case '(':
5427 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5428 		break;
5429 	case ')':
5430 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5431 		break;
5432 	case '{':
5433 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5434 		break;
5435 	case '}':
5436 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5437 		break;
5438 	case '[':
5439 		if (s->diff_context > 0) {
5440 			s->diff_context--;
5441 			s->matched_line = 0;
5442 			diff_view_indicate_progress(view);
5443 			err = create_diff(s);
5444 			if (s->first_displayed_line + view->nlines - 1 >
5445 			    s->nlines) {
5446 				s->first_displayed_line = 1;
5447 				s->last_displayed_line = view->nlines;
5448 			}
5449 		} else
5450 			view->count = 0;
5451 		break;
5452 	case ']':
5453 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5454 			s->diff_context++;
5455 			s->matched_line = 0;
5456 			diff_view_indicate_progress(view);
5457 			err = create_diff(s);
5458 		} else
5459 			view->count = 0;
5460 		break;
5461 	case '<':
5462 	case ',':
5463 	case 'K':
5464 		up = 1;
5465 		/* FALL THROUGH */
5466 	case '>':
5467 	case '.':
5468 	case 'J':
5469 		if (s->parent_view == NULL) {
5470 			view->count = 0;
5471 			break;
5472 		}
5473 		s->parent_view->count = view->count;
5474 
5475 		if (s->parent_view->type == TOG_VIEW_LOG) {
5476 			ls = &s->parent_view->state.log;
5477 			old_selected_entry = ls->selected_entry;
5478 
5479 			err = input_log_view(NULL, s->parent_view,
5480 			    up ? KEY_UP : KEY_DOWN);
5481 			if (err)
5482 				break;
5483 			view->count = s->parent_view->count;
5484 
5485 			if (old_selected_entry == ls->selected_entry)
5486 				break;
5487 
5488 			err = set_selected_commit(s, ls->selected_entry);
5489 			if (err)
5490 				break;
5491 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5492 			struct tog_blame_view_state *bs;
5493 			struct got_object_id *id, *prev_id;
5494 
5495 			bs = &s->parent_view->state.blame;
5496 			prev_id = get_annotation_for_line(bs->blame.lines,
5497 			    bs->blame.nlines, bs->last_diffed_line);
5498 
5499 			err = input_blame_view(&view, s->parent_view,
5500 			    up ? KEY_UP : KEY_DOWN);
5501 			if (err)
5502 				break;
5503 			view->count = s->parent_view->count;
5504 
5505 			if (prev_id == NULL)
5506 				break;
5507 			id = get_selected_commit_id(bs->blame.lines,
5508 			    bs->blame.nlines, bs->first_displayed_line,
5509 			    bs->selected_line);
5510 			if (id == NULL)
5511 				break;
5512 
5513 			if (!got_object_id_cmp(prev_id, id))
5514 				break;
5515 
5516 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5517 			if (err)
5518 				break;
5519 		}
5520 		s->first_displayed_line = 1;
5521 		s->last_displayed_line = view->nlines;
5522 		s->matched_line = 0;
5523 		view->x = 0;
5524 
5525 		diff_view_indicate_progress(view);
5526 		err = create_diff(s);
5527 		break;
5528 	default:
5529 		view->count = 0;
5530 		break;
5531 	}
5532 
5533 	return err;
5534 }
5535 
5536 static const struct got_error *
5537 cmd_diff(int argc, char *argv[])
5538 {
5539 	const struct got_error *error = NULL;
5540 	struct got_repository *repo = NULL;
5541 	struct got_worktree *worktree = NULL;
5542 	struct got_object_id *id1 = NULL, *id2 = NULL;
5543 	char *repo_path = NULL, *cwd = NULL;
5544 	char *id_str1 = NULL, *id_str2 = NULL;
5545 	char *label1 = NULL, *label2 = NULL;
5546 	int diff_context = 3, ignore_whitespace = 0;
5547 	int ch, force_text_diff = 0;
5548 	const char *errstr;
5549 	struct tog_view *view;
5550 	int *pack_fds = NULL;
5551 
5552 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5553 		switch (ch) {
5554 		case 'a':
5555 			force_text_diff = 1;
5556 			break;
5557 		case 'C':
5558 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5559 			    &errstr);
5560 			if (errstr != NULL)
5561 				errx(1, "number of context lines is %s: %s",
5562 				    errstr, errstr);
5563 			break;
5564 		case 'r':
5565 			repo_path = realpath(optarg, NULL);
5566 			if (repo_path == NULL)
5567 				return got_error_from_errno2("realpath",
5568 				    optarg);
5569 			got_path_strip_trailing_slashes(repo_path);
5570 			break;
5571 		case 'w':
5572 			ignore_whitespace = 1;
5573 			break;
5574 		default:
5575 			usage_diff();
5576 			/* NOTREACHED */
5577 		}
5578 	}
5579 
5580 	argc -= optind;
5581 	argv += optind;
5582 
5583 	if (argc == 0) {
5584 		usage_diff(); /* TODO show local worktree changes */
5585 	} else if (argc == 2) {
5586 		id_str1 = argv[0];
5587 		id_str2 = argv[1];
5588 	} else
5589 		usage_diff();
5590 
5591 	error = got_repo_pack_fds_open(&pack_fds);
5592 	if (error)
5593 		goto done;
5594 
5595 	if (repo_path == NULL) {
5596 		cwd = getcwd(NULL, 0);
5597 		if (cwd == NULL)
5598 			return got_error_from_errno("getcwd");
5599 		error = got_worktree_open(&worktree, cwd);
5600 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5601 			goto done;
5602 		if (worktree)
5603 			repo_path =
5604 			    strdup(got_worktree_get_repo_path(worktree));
5605 		else
5606 			repo_path = strdup(cwd);
5607 		if (repo_path == NULL) {
5608 			error = got_error_from_errno("strdup");
5609 			goto done;
5610 		}
5611 	}
5612 
5613 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5614 	if (error)
5615 		goto done;
5616 
5617 	init_curses();
5618 
5619 	error = apply_unveil(got_repo_get_path(repo), NULL);
5620 	if (error)
5621 		goto done;
5622 
5623 	error = tog_load_refs(repo, 0);
5624 	if (error)
5625 		goto done;
5626 
5627 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5628 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5629 	if (error)
5630 		goto done;
5631 
5632 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5633 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5634 	if (error)
5635 		goto done;
5636 
5637 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5638 	if (view == NULL) {
5639 		error = got_error_from_errno("view_open");
5640 		goto done;
5641 	}
5642 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5643 	    ignore_whitespace, force_text_diff, NULL,  repo);
5644 	if (error)
5645 		goto done;
5646 	error = view_loop(view);
5647 done:
5648 	free(label1);
5649 	free(label2);
5650 	free(repo_path);
5651 	free(cwd);
5652 	if (repo) {
5653 		const struct got_error *close_err = got_repo_close(repo);
5654 		if (error == NULL)
5655 			error = close_err;
5656 	}
5657 	if (worktree)
5658 		got_worktree_close(worktree);
5659 	if (pack_fds) {
5660 		const struct got_error *pack_err =
5661 		    got_repo_pack_fds_close(pack_fds);
5662 		if (error == NULL)
5663 			error = pack_err;
5664 	}
5665 	tog_free_refs();
5666 	return error;
5667 }
5668 
5669 __dead static void
5670 usage_blame(void)
5671 {
5672 	endwin();
5673 	fprintf(stderr,
5674 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5675 	    getprogname());
5676 	exit(1);
5677 }
5678 
5679 struct tog_blame_line {
5680 	int annotated;
5681 	struct got_object_id *id;
5682 };
5683 
5684 static const struct got_error *
5685 draw_blame(struct tog_view *view)
5686 {
5687 	struct tog_blame_view_state *s = &view->state.blame;
5688 	struct tog_blame *blame = &s->blame;
5689 	regmatch_t *regmatch = &view->regmatch;
5690 	const struct got_error *err;
5691 	int lineno = 0, nprinted = 0;
5692 	char *line = NULL;
5693 	size_t linesize = 0;
5694 	ssize_t linelen;
5695 	wchar_t *wline;
5696 	int width;
5697 	struct tog_blame_line *blame_line;
5698 	struct got_object_id *prev_id = NULL;
5699 	char *id_str;
5700 	struct tog_color *tc;
5701 
5702 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5703 	if (err)
5704 		return err;
5705 
5706 	rewind(blame->f);
5707 	werase(view->window);
5708 
5709 	if (asprintf(&line, "commit %s", id_str) == -1) {
5710 		err = got_error_from_errno("asprintf");
5711 		free(id_str);
5712 		return err;
5713 	}
5714 
5715 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5716 	free(line);
5717 	line = NULL;
5718 	if (err)
5719 		return err;
5720 	if (view_needs_focus_indication(view))
5721 		wstandout(view->window);
5722 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5723 	if (tc)
5724 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5725 	waddwstr(view->window, wline);
5726 	while (width++ < view->ncols)
5727 		waddch(view->window, ' ');
5728 	if (tc)
5729 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5730 	if (view_needs_focus_indication(view))
5731 		wstandend(view->window);
5732 	free(wline);
5733 	wline = NULL;
5734 
5735 	if (view->gline > blame->nlines)
5736 		view->gline = blame->nlines;
5737 
5738 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5739 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5740 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5741 		free(id_str);
5742 		return got_error_from_errno("asprintf");
5743 	}
5744 	free(id_str);
5745 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5746 	free(line);
5747 	line = NULL;
5748 	if (err)
5749 		return err;
5750 	waddwstr(view->window, wline);
5751 	free(wline);
5752 	wline = NULL;
5753 	if (width < view->ncols - 1)
5754 		waddch(view->window, '\n');
5755 
5756 	s->eof = 0;
5757 	view->maxx = 0;
5758 	while (nprinted < view->nlines - 2) {
5759 		linelen = getline(&line, &linesize, blame->f);
5760 		if (linelen == -1) {
5761 			if (feof(blame->f)) {
5762 				s->eof = 1;
5763 				break;
5764 			}
5765 			free(line);
5766 			return got_ferror(blame->f, GOT_ERR_IO);
5767 		}
5768 		if (++lineno < s->first_displayed_line)
5769 			continue;
5770 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5771 			continue;
5772 
5773 		/* Set view->maxx based on full line length. */
5774 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5775 		if (err) {
5776 			free(line);
5777 			return err;
5778 		}
5779 		free(wline);
5780 		wline = NULL;
5781 		view->maxx = MAX(view->maxx, width);
5782 
5783 		if (nprinted == s->selected_line - 1)
5784 			wstandout(view->window);
5785 
5786 		if (blame->nlines > 0) {
5787 			blame_line = &blame->lines[lineno - 1];
5788 			if (blame_line->annotated && prev_id &&
5789 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5790 			    !(nprinted == s->selected_line - 1)) {
5791 				waddstr(view->window, "        ");
5792 			} else if (blame_line->annotated) {
5793 				char *id_str;
5794 				err = got_object_id_str(&id_str,
5795 				    blame_line->id);
5796 				if (err) {
5797 					free(line);
5798 					return err;
5799 				}
5800 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5801 				if (tc)
5802 					wattr_on(view->window,
5803 					    COLOR_PAIR(tc->colorpair), NULL);
5804 				wprintw(view->window, "%.8s", id_str);
5805 				if (tc)
5806 					wattr_off(view->window,
5807 					    COLOR_PAIR(tc->colorpair), NULL);
5808 				free(id_str);
5809 				prev_id = blame_line->id;
5810 			} else {
5811 				waddstr(view->window, "........");
5812 				prev_id = NULL;
5813 			}
5814 		} else {
5815 			waddstr(view->window, "........");
5816 			prev_id = NULL;
5817 		}
5818 
5819 		if (nprinted == s->selected_line - 1)
5820 			wstandend(view->window);
5821 		waddstr(view->window, " ");
5822 
5823 		if (view->ncols <= 9) {
5824 			width = 9;
5825 		} else if (s->first_displayed_line + nprinted ==
5826 		    s->matched_line &&
5827 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5828 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5829 			    view->window, view->x, regmatch);
5830 			if (err) {
5831 				free(line);
5832 				return err;
5833 			}
5834 			width += 9;
5835 		} else {
5836 			int skip;
5837 			err = format_line(&wline, &width, &skip, line,
5838 			    view->x, view->ncols - 9, 9, 1);
5839 			if (err) {
5840 				free(line);
5841 				return err;
5842 			}
5843 			waddwstr(view->window, &wline[skip]);
5844 			width += 9;
5845 			free(wline);
5846 			wline = NULL;
5847 		}
5848 
5849 		if (width <= view->ncols - 1)
5850 			waddch(view->window, '\n');
5851 		if (++nprinted == 1)
5852 			s->first_displayed_line = lineno;
5853 	}
5854 	free(line);
5855 	s->last_displayed_line = lineno;
5856 
5857 	view_border(view);
5858 
5859 	return NULL;
5860 }
5861 
5862 static const struct got_error *
5863 blame_cb(void *arg, int nlines, int lineno,
5864     struct got_commit_object *commit, struct got_object_id *id)
5865 {
5866 	const struct got_error *err = NULL;
5867 	struct tog_blame_cb_args *a = arg;
5868 	struct tog_blame_line *line;
5869 	int errcode;
5870 
5871 	if (nlines != a->nlines ||
5872 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5873 		return got_error(GOT_ERR_RANGE);
5874 
5875 	errcode = pthread_mutex_lock(&tog_mutex);
5876 	if (errcode)
5877 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5878 
5879 	if (*a->quit) {	/* user has quit the blame view */
5880 		err = got_error(GOT_ERR_ITER_COMPLETED);
5881 		goto done;
5882 	}
5883 
5884 	if (lineno == -1)
5885 		goto done; /* no change in this commit */
5886 
5887 	line = &a->lines[lineno - 1];
5888 	if (line->annotated)
5889 		goto done;
5890 
5891 	line->id = got_object_id_dup(id);
5892 	if (line->id == NULL) {
5893 		err = got_error_from_errno("got_object_id_dup");
5894 		goto done;
5895 	}
5896 	line->annotated = 1;
5897 done:
5898 	errcode = pthread_mutex_unlock(&tog_mutex);
5899 	if (errcode)
5900 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5901 	return err;
5902 }
5903 
5904 static void *
5905 blame_thread(void *arg)
5906 {
5907 	const struct got_error *err, *close_err;
5908 	struct tog_blame_thread_args *ta = arg;
5909 	struct tog_blame_cb_args *a = ta->cb_args;
5910 	int errcode, fd1 = -1, fd2 = -1;
5911 	FILE *f1 = NULL, *f2 = NULL;
5912 
5913 	fd1 = got_opentempfd();
5914 	if (fd1 == -1)
5915 		return (void *)got_error_from_errno("got_opentempfd");
5916 
5917 	fd2 = got_opentempfd();
5918 	if (fd2 == -1) {
5919 		err = got_error_from_errno("got_opentempfd");
5920 		goto done;
5921 	}
5922 
5923 	f1 = got_opentemp();
5924 	if (f1 == NULL) {
5925 		err = (void *)got_error_from_errno("got_opentemp");
5926 		goto done;
5927 	}
5928 	f2 = got_opentemp();
5929 	if (f2 == NULL) {
5930 		err = (void *)got_error_from_errno("got_opentemp");
5931 		goto done;
5932 	}
5933 
5934 	err = block_signals_used_by_main_thread();
5935 	if (err)
5936 		goto done;
5937 
5938 	err = got_blame(ta->path, a->commit_id, ta->repo,
5939 	    tog_diff_algo, blame_cb, ta->cb_args,
5940 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5941 	if (err && err->code == GOT_ERR_CANCELLED)
5942 		err = NULL;
5943 
5944 	errcode = pthread_mutex_lock(&tog_mutex);
5945 	if (errcode) {
5946 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5947 		goto done;
5948 	}
5949 
5950 	close_err = got_repo_close(ta->repo);
5951 	if (err == NULL)
5952 		err = close_err;
5953 	ta->repo = NULL;
5954 	*ta->complete = 1;
5955 
5956 	errcode = pthread_mutex_unlock(&tog_mutex);
5957 	if (errcode && err == NULL)
5958 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5959 
5960 done:
5961 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5962 		err = got_error_from_errno("close");
5963 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5964 		err = got_error_from_errno("close");
5965 	if (f1 && fclose(f1) == EOF && err == NULL)
5966 		err = got_error_from_errno("fclose");
5967 	if (f2 && fclose(f2) == EOF && err == NULL)
5968 		err = got_error_from_errno("fclose");
5969 
5970 	return (void *)err;
5971 }
5972 
5973 static struct got_object_id *
5974 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5975     int first_displayed_line, int selected_line)
5976 {
5977 	struct tog_blame_line *line;
5978 
5979 	if (nlines <= 0)
5980 		return NULL;
5981 
5982 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5983 	if (!line->annotated)
5984 		return NULL;
5985 
5986 	return line->id;
5987 }
5988 
5989 static struct got_object_id *
5990 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5991     int lineno)
5992 {
5993 	struct tog_blame_line *line;
5994 
5995 	if (nlines <= 0 || lineno >= nlines)
5996 		return NULL;
5997 
5998 	line = &lines[lineno - 1];
5999 	if (!line->annotated)
6000 		return NULL;
6001 
6002 	return line->id;
6003 }
6004 
6005 static const struct got_error *
6006 stop_blame(struct tog_blame *blame)
6007 {
6008 	const struct got_error *err = NULL;
6009 	int i;
6010 
6011 	if (blame->thread) {
6012 		int errcode;
6013 		errcode = pthread_mutex_unlock(&tog_mutex);
6014 		if (errcode)
6015 			return got_error_set_errno(errcode,
6016 			    "pthread_mutex_unlock");
6017 		errcode = pthread_join(blame->thread, (void **)&err);
6018 		if (errcode)
6019 			return got_error_set_errno(errcode, "pthread_join");
6020 		errcode = pthread_mutex_lock(&tog_mutex);
6021 		if (errcode)
6022 			return got_error_set_errno(errcode,
6023 			    "pthread_mutex_lock");
6024 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6025 			err = NULL;
6026 		blame->thread = NULL;
6027 	}
6028 	if (blame->thread_args.repo) {
6029 		const struct got_error *close_err;
6030 		close_err = got_repo_close(blame->thread_args.repo);
6031 		if (err == NULL)
6032 			err = close_err;
6033 		blame->thread_args.repo = NULL;
6034 	}
6035 	if (blame->f) {
6036 		if (fclose(blame->f) == EOF && err == NULL)
6037 			err = got_error_from_errno("fclose");
6038 		blame->f = NULL;
6039 	}
6040 	if (blame->lines) {
6041 		for (i = 0; i < blame->nlines; i++)
6042 			free(blame->lines[i].id);
6043 		free(blame->lines);
6044 		blame->lines = NULL;
6045 	}
6046 	free(blame->cb_args.commit_id);
6047 	blame->cb_args.commit_id = NULL;
6048 	if (blame->pack_fds) {
6049 		const struct got_error *pack_err =
6050 		    got_repo_pack_fds_close(blame->pack_fds);
6051 		if (err == NULL)
6052 			err = pack_err;
6053 		blame->pack_fds = NULL;
6054 	}
6055 	return err;
6056 }
6057 
6058 static const struct got_error *
6059 cancel_blame_view(void *arg)
6060 {
6061 	const struct got_error *err = NULL;
6062 	int *done = arg;
6063 	int errcode;
6064 
6065 	errcode = pthread_mutex_lock(&tog_mutex);
6066 	if (errcode)
6067 		return got_error_set_errno(errcode,
6068 		    "pthread_mutex_unlock");
6069 
6070 	if (*done)
6071 		err = got_error(GOT_ERR_CANCELLED);
6072 
6073 	errcode = pthread_mutex_unlock(&tog_mutex);
6074 	if (errcode)
6075 		return got_error_set_errno(errcode,
6076 		    "pthread_mutex_lock");
6077 
6078 	return err;
6079 }
6080 
6081 static const struct got_error *
6082 run_blame(struct tog_view *view)
6083 {
6084 	struct tog_blame_view_state *s = &view->state.blame;
6085 	struct tog_blame *blame = &s->blame;
6086 	const struct got_error *err = NULL;
6087 	struct got_commit_object *commit = NULL;
6088 	struct got_blob_object *blob = NULL;
6089 	struct got_repository *thread_repo = NULL;
6090 	struct got_object_id *obj_id = NULL;
6091 	int obj_type, fd = -1;
6092 	int *pack_fds = NULL;
6093 
6094 	err = got_object_open_as_commit(&commit, s->repo,
6095 	    &s->blamed_commit->id);
6096 	if (err)
6097 		return err;
6098 
6099 	fd = got_opentempfd();
6100 	if (fd == -1) {
6101 		err = got_error_from_errno("got_opentempfd");
6102 		goto done;
6103 	}
6104 
6105 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6106 	if (err)
6107 		goto done;
6108 
6109 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6110 	if (err)
6111 		goto done;
6112 
6113 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6114 		err = got_error(GOT_ERR_OBJ_TYPE);
6115 		goto done;
6116 	}
6117 
6118 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6119 	if (err)
6120 		goto done;
6121 	blame->f = got_opentemp();
6122 	if (blame->f == NULL) {
6123 		err = got_error_from_errno("got_opentemp");
6124 		goto done;
6125 	}
6126 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6127 	    &blame->line_offsets, blame->f, blob);
6128 	if (err)
6129 		goto done;
6130 	if (blame->nlines == 0) {
6131 		s->blame_complete = 1;
6132 		goto done;
6133 	}
6134 
6135 	/* Don't include \n at EOF in the blame line count. */
6136 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6137 		blame->nlines--;
6138 
6139 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6140 	if (blame->lines == NULL) {
6141 		err = got_error_from_errno("calloc");
6142 		goto done;
6143 	}
6144 
6145 	err = got_repo_pack_fds_open(&pack_fds);
6146 	if (err)
6147 		goto done;
6148 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6149 	    pack_fds);
6150 	if (err)
6151 		goto done;
6152 
6153 	blame->pack_fds = pack_fds;
6154 	blame->cb_args.view = view;
6155 	blame->cb_args.lines = blame->lines;
6156 	blame->cb_args.nlines = blame->nlines;
6157 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6158 	if (blame->cb_args.commit_id == NULL) {
6159 		err = got_error_from_errno("got_object_id_dup");
6160 		goto done;
6161 	}
6162 	blame->cb_args.quit = &s->done;
6163 
6164 	blame->thread_args.path = s->path;
6165 	blame->thread_args.repo = thread_repo;
6166 	blame->thread_args.cb_args = &blame->cb_args;
6167 	blame->thread_args.complete = &s->blame_complete;
6168 	blame->thread_args.cancel_cb = cancel_blame_view;
6169 	blame->thread_args.cancel_arg = &s->done;
6170 	s->blame_complete = 0;
6171 
6172 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6173 		s->first_displayed_line = 1;
6174 		s->last_displayed_line = view->nlines;
6175 		s->selected_line = 1;
6176 	}
6177 	s->matched_line = 0;
6178 
6179 done:
6180 	if (commit)
6181 		got_object_commit_close(commit);
6182 	if (fd != -1 && close(fd) == -1 && err == NULL)
6183 		err = got_error_from_errno("close");
6184 	if (blob)
6185 		got_object_blob_close(blob);
6186 	free(obj_id);
6187 	if (err)
6188 		stop_blame(blame);
6189 	return err;
6190 }
6191 
6192 static const struct got_error *
6193 open_blame_view(struct tog_view *view, char *path,
6194     struct got_object_id *commit_id, struct got_repository *repo)
6195 {
6196 	const struct got_error *err = NULL;
6197 	struct tog_blame_view_state *s = &view->state.blame;
6198 
6199 	STAILQ_INIT(&s->blamed_commits);
6200 
6201 	s->path = strdup(path);
6202 	if (s->path == NULL)
6203 		return got_error_from_errno("strdup");
6204 
6205 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6206 	if (err) {
6207 		free(s->path);
6208 		return err;
6209 	}
6210 
6211 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6212 	s->first_displayed_line = 1;
6213 	s->last_displayed_line = view->nlines;
6214 	s->selected_line = 1;
6215 	s->blame_complete = 0;
6216 	s->repo = repo;
6217 	s->commit_id = commit_id;
6218 	memset(&s->blame, 0, sizeof(s->blame));
6219 
6220 	STAILQ_INIT(&s->colors);
6221 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6222 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6223 		    get_color_value("TOG_COLOR_COMMIT"));
6224 		if (err)
6225 			return err;
6226 	}
6227 
6228 	view->show = show_blame_view;
6229 	view->input = input_blame_view;
6230 	view->reset = reset_blame_view;
6231 	view->close = close_blame_view;
6232 	view->search_start = search_start_blame_view;
6233 	view->search_setup = search_setup_blame_view;
6234 	view->search_next = search_next_view_match;
6235 
6236 	return run_blame(view);
6237 }
6238 
6239 static const struct got_error *
6240 close_blame_view(struct tog_view *view)
6241 {
6242 	const struct got_error *err = NULL;
6243 	struct tog_blame_view_state *s = &view->state.blame;
6244 
6245 	if (s->blame.thread)
6246 		err = stop_blame(&s->blame);
6247 
6248 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6249 		struct got_object_qid *blamed_commit;
6250 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6251 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6252 		got_object_qid_free(blamed_commit);
6253 	}
6254 
6255 	free(s->path);
6256 	free_colors(&s->colors);
6257 	return err;
6258 }
6259 
6260 static const struct got_error *
6261 search_start_blame_view(struct tog_view *view)
6262 {
6263 	struct tog_blame_view_state *s = &view->state.blame;
6264 
6265 	s->matched_line = 0;
6266 	return NULL;
6267 }
6268 
6269 static void
6270 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6271     size_t *nlines, int **first, int **last, int **match, int **selected)
6272 {
6273 	struct tog_blame_view_state *s = &view->state.blame;
6274 
6275 	*f = s->blame.f;
6276 	*nlines = s->blame.nlines;
6277 	*line_offsets = s->blame.line_offsets;
6278 	*match = &s->matched_line;
6279 	*first = &s->first_displayed_line;
6280 	*last = &s->last_displayed_line;
6281 	*selected = &s->selected_line;
6282 }
6283 
6284 static const struct got_error *
6285 show_blame_view(struct tog_view *view)
6286 {
6287 	const struct got_error *err = NULL;
6288 	struct tog_blame_view_state *s = &view->state.blame;
6289 	int errcode;
6290 
6291 	if (s->blame.thread == NULL && !s->blame_complete) {
6292 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6293 		    &s->blame.thread_args);
6294 		if (errcode)
6295 			return got_error_set_errno(errcode, "pthread_create");
6296 
6297 		halfdelay(1); /* fast refresh while annotating  */
6298 	}
6299 
6300 	if (s->blame_complete)
6301 		halfdelay(10); /* disable fast refresh */
6302 
6303 	err = draw_blame(view);
6304 
6305 	view_border(view);
6306 	return err;
6307 }
6308 
6309 static const struct got_error *
6310 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6311     struct got_repository *repo, struct got_object_id *id)
6312 {
6313 	struct tog_view		*log_view;
6314 	const struct got_error	*err = NULL;
6315 
6316 	*new_view = NULL;
6317 
6318 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6319 	if (log_view == NULL)
6320 		return got_error_from_errno("view_open");
6321 
6322 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6323 	if (err)
6324 		view_close(log_view);
6325 	else
6326 		*new_view = log_view;
6327 
6328 	return err;
6329 }
6330 
6331 static const struct got_error *
6332 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6333 {
6334 	const struct got_error *err = NULL, *thread_err = NULL;
6335 	struct tog_view *diff_view;
6336 	struct tog_blame_view_state *s = &view->state.blame;
6337 	int eos, nscroll, begin_y = 0, begin_x = 0;
6338 
6339 	eos = nscroll = view->nlines - 2;
6340 	if (view_is_hsplit_top(view))
6341 		--eos;  /* border */
6342 
6343 	switch (ch) {
6344 	case '0':
6345 	case '$':
6346 	case KEY_RIGHT:
6347 	case 'l':
6348 	case KEY_LEFT:
6349 	case 'h':
6350 		horizontal_scroll_input(view, ch);
6351 		break;
6352 	case 'q':
6353 		s->done = 1;
6354 		break;
6355 	case 'g':
6356 	case KEY_HOME:
6357 		s->selected_line = 1;
6358 		s->first_displayed_line = 1;
6359 		view->count = 0;
6360 		break;
6361 	case 'G':
6362 	case KEY_END:
6363 		if (s->blame.nlines < eos) {
6364 			s->selected_line = s->blame.nlines;
6365 			s->first_displayed_line = 1;
6366 		} else {
6367 			s->selected_line = eos;
6368 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6369 		}
6370 		view->count = 0;
6371 		break;
6372 	case 'k':
6373 	case KEY_UP:
6374 	case CTRL('p'):
6375 		if (s->selected_line > 1)
6376 			s->selected_line--;
6377 		else if (s->selected_line == 1 &&
6378 		    s->first_displayed_line > 1)
6379 			s->first_displayed_line--;
6380 		else
6381 			view->count = 0;
6382 		break;
6383 	case CTRL('u'):
6384 	case 'u':
6385 		nscroll /= 2;
6386 		/* FALL THROUGH */
6387 	case KEY_PPAGE:
6388 	case CTRL('b'):
6389 	case 'b':
6390 		if (s->first_displayed_line == 1) {
6391 			if (view->count > 1)
6392 				nscroll += nscroll;
6393 			s->selected_line = MAX(1, s->selected_line - nscroll);
6394 			view->count = 0;
6395 			break;
6396 		}
6397 		if (s->first_displayed_line > nscroll)
6398 			s->first_displayed_line -= nscroll;
6399 		else
6400 			s->first_displayed_line = 1;
6401 		break;
6402 	case 'j':
6403 	case KEY_DOWN:
6404 	case CTRL('n'):
6405 		if (s->selected_line < eos && s->first_displayed_line +
6406 		    s->selected_line <= s->blame.nlines)
6407 			s->selected_line++;
6408 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6409 			s->first_displayed_line++;
6410 		else
6411 			view->count = 0;
6412 		break;
6413 	case 'c':
6414 	case 'p': {
6415 		struct got_object_id *id = NULL;
6416 
6417 		view->count = 0;
6418 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6419 		    s->first_displayed_line, s->selected_line);
6420 		if (id == NULL)
6421 			break;
6422 		if (ch == 'p') {
6423 			struct got_commit_object *commit, *pcommit;
6424 			struct got_object_qid *pid;
6425 			struct got_object_id *blob_id = NULL;
6426 			int obj_type;
6427 			err = got_object_open_as_commit(&commit,
6428 			    s->repo, id);
6429 			if (err)
6430 				break;
6431 			pid = STAILQ_FIRST(
6432 			    got_object_commit_get_parent_ids(commit));
6433 			if (pid == NULL) {
6434 				got_object_commit_close(commit);
6435 				break;
6436 			}
6437 			/* Check if path history ends here. */
6438 			err = got_object_open_as_commit(&pcommit,
6439 			    s->repo, &pid->id);
6440 			if (err)
6441 				break;
6442 			err = got_object_id_by_path(&blob_id, s->repo,
6443 			    pcommit, s->path);
6444 			got_object_commit_close(pcommit);
6445 			if (err) {
6446 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6447 					err = NULL;
6448 				got_object_commit_close(commit);
6449 				break;
6450 			}
6451 			err = got_object_get_type(&obj_type, s->repo,
6452 			    blob_id);
6453 			free(blob_id);
6454 			/* Can't blame non-blob type objects. */
6455 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6456 				got_object_commit_close(commit);
6457 				break;
6458 			}
6459 			err = got_object_qid_alloc(&s->blamed_commit,
6460 			    &pid->id);
6461 			got_object_commit_close(commit);
6462 		} else {
6463 			if (got_object_id_cmp(id,
6464 			    &s->blamed_commit->id) == 0)
6465 				break;
6466 			err = got_object_qid_alloc(&s->blamed_commit,
6467 			    id);
6468 		}
6469 		if (err)
6470 			break;
6471 		s->done = 1;
6472 		thread_err = stop_blame(&s->blame);
6473 		s->done = 0;
6474 		if (thread_err)
6475 			break;
6476 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6477 		    s->blamed_commit, entry);
6478 		err = run_blame(view);
6479 		if (err)
6480 			break;
6481 		break;
6482 	}
6483 	case 'C': {
6484 		struct got_object_qid *first;
6485 
6486 		view->count = 0;
6487 		first = STAILQ_FIRST(&s->blamed_commits);
6488 		if (!got_object_id_cmp(&first->id, s->commit_id))
6489 			break;
6490 		s->done = 1;
6491 		thread_err = stop_blame(&s->blame);
6492 		s->done = 0;
6493 		if (thread_err)
6494 			break;
6495 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6496 		got_object_qid_free(s->blamed_commit);
6497 		s->blamed_commit =
6498 		    STAILQ_FIRST(&s->blamed_commits);
6499 		err = run_blame(view);
6500 		if (err)
6501 			break;
6502 		break;
6503 	}
6504 	case 'L':
6505 		view->count = 0;
6506 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6507 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6508 		if (s->id_to_log)
6509 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6510 		break;
6511 	case KEY_ENTER:
6512 	case '\r': {
6513 		struct got_object_id *id = NULL;
6514 		struct got_object_qid *pid;
6515 		struct got_commit_object *commit = NULL;
6516 
6517 		view->count = 0;
6518 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6519 		    s->first_displayed_line, s->selected_line);
6520 		if (id == NULL)
6521 			break;
6522 		err = got_object_open_as_commit(&commit, s->repo, id);
6523 		if (err)
6524 			break;
6525 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6526 		if (*new_view) {
6527 			/* traversed from diff view, release diff resources  */
6528 			err = close_diff_view(*new_view);
6529 			if (err)
6530 				break;
6531 			diff_view = *new_view;
6532 		} else {
6533 			if (view_is_parent_view(view))
6534 				view_get_split(view, &begin_y, &begin_x);
6535 
6536 			diff_view = view_open(0, 0, begin_y, begin_x,
6537 			    TOG_VIEW_DIFF);
6538 			if (diff_view == NULL) {
6539 				got_object_commit_close(commit);
6540 				err = got_error_from_errno("view_open");
6541 				break;
6542 			}
6543 		}
6544 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6545 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6546 		got_object_commit_close(commit);
6547 		if (err) {
6548 			view_close(diff_view);
6549 			break;
6550 		}
6551 		s->last_diffed_line = s->first_displayed_line - 1 +
6552 		    s->selected_line;
6553 		if (*new_view)
6554 			break;	/* still open from active diff view */
6555 		if (view_is_parent_view(view) &&
6556 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6557 			err = view_init_hsplit(view, begin_y);
6558 			if (err)
6559 				break;
6560 		}
6561 
6562 		view->focussed = 0;
6563 		diff_view->focussed = 1;
6564 		diff_view->mode = view->mode;
6565 		diff_view->nlines = view->lines - begin_y;
6566 		if (view_is_parent_view(view)) {
6567 			view_transfer_size(diff_view, view);
6568 			err = view_close_child(view);
6569 			if (err)
6570 				break;
6571 			err = view_set_child(view, diff_view);
6572 			if (err)
6573 				break;
6574 			view->focus_child = 1;
6575 		} else
6576 			*new_view = diff_view;
6577 		if (err)
6578 			break;
6579 		break;
6580 	}
6581 	case CTRL('d'):
6582 	case 'd':
6583 		nscroll /= 2;
6584 		/* FALL THROUGH */
6585 	case KEY_NPAGE:
6586 	case CTRL('f'):
6587 	case 'f':
6588 	case ' ':
6589 		if (s->last_displayed_line >= s->blame.nlines &&
6590 		    s->selected_line >= MIN(s->blame.nlines,
6591 		    view->nlines - 2)) {
6592 			view->count = 0;
6593 			break;
6594 		}
6595 		if (s->last_displayed_line >= s->blame.nlines &&
6596 		    s->selected_line < view->nlines - 2) {
6597 			s->selected_line +=
6598 			    MIN(nscroll, s->last_displayed_line -
6599 			    s->first_displayed_line - s->selected_line + 1);
6600 		}
6601 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6602 			s->first_displayed_line += nscroll;
6603 		else
6604 			s->first_displayed_line =
6605 			    s->blame.nlines - (view->nlines - 3);
6606 		break;
6607 	case KEY_RESIZE:
6608 		if (s->selected_line > view->nlines - 2) {
6609 			s->selected_line = MIN(s->blame.nlines,
6610 			    view->nlines - 2);
6611 		}
6612 		break;
6613 	default:
6614 		view->count = 0;
6615 		break;
6616 	}
6617 	return thread_err ? thread_err : err;
6618 }
6619 
6620 static const struct got_error *
6621 reset_blame_view(struct tog_view *view)
6622 {
6623 	const struct got_error *err;
6624 	struct tog_blame_view_state *s = &view->state.blame;
6625 
6626 	view->count = 0;
6627 	s->done = 1;
6628 	err = stop_blame(&s->blame);
6629 	s->done = 0;
6630 	if (err)
6631 		return err;
6632 	return run_blame(view);
6633 }
6634 
6635 static const struct got_error *
6636 cmd_blame(int argc, char *argv[])
6637 {
6638 	const struct got_error *error;
6639 	struct got_repository *repo = NULL;
6640 	struct got_worktree *worktree = NULL;
6641 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6642 	char *link_target = NULL;
6643 	struct got_object_id *commit_id = NULL;
6644 	struct got_commit_object *commit = NULL;
6645 	char *commit_id_str = NULL;
6646 	int ch;
6647 	struct tog_view *view;
6648 	int *pack_fds = NULL;
6649 
6650 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6651 		switch (ch) {
6652 		case 'c':
6653 			commit_id_str = optarg;
6654 			break;
6655 		case 'r':
6656 			repo_path = realpath(optarg, NULL);
6657 			if (repo_path == NULL)
6658 				return got_error_from_errno2("realpath",
6659 				    optarg);
6660 			break;
6661 		default:
6662 			usage_blame();
6663 			/* NOTREACHED */
6664 		}
6665 	}
6666 
6667 	argc -= optind;
6668 	argv += optind;
6669 
6670 	if (argc != 1)
6671 		usage_blame();
6672 
6673 	error = got_repo_pack_fds_open(&pack_fds);
6674 	if (error != NULL)
6675 		goto done;
6676 
6677 	if (repo_path == NULL) {
6678 		cwd = getcwd(NULL, 0);
6679 		if (cwd == NULL)
6680 			return got_error_from_errno("getcwd");
6681 		error = got_worktree_open(&worktree, cwd);
6682 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6683 			goto done;
6684 		if (worktree)
6685 			repo_path =
6686 			    strdup(got_worktree_get_repo_path(worktree));
6687 		else
6688 			repo_path = strdup(cwd);
6689 		if (repo_path == NULL) {
6690 			error = got_error_from_errno("strdup");
6691 			goto done;
6692 		}
6693 	}
6694 
6695 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6696 	if (error != NULL)
6697 		goto done;
6698 
6699 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6700 	    worktree);
6701 	if (error)
6702 		goto done;
6703 
6704 	init_curses();
6705 
6706 	error = apply_unveil(got_repo_get_path(repo), NULL);
6707 	if (error)
6708 		goto done;
6709 
6710 	error = tog_load_refs(repo, 0);
6711 	if (error)
6712 		goto done;
6713 
6714 	if (commit_id_str == NULL) {
6715 		struct got_reference *head_ref;
6716 		error = got_ref_open(&head_ref, repo, worktree ?
6717 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6718 		if (error != NULL)
6719 			goto done;
6720 		error = got_ref_resolve(&commit_id, repo, head_ref);
6721 		got_ref_close(head_ref);
6722 	} else {
6723 		error = got_repo_match_object_id(&commit_id, NULL,
6724 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6725 	}
6726 	if (error != NULL)
6727 		goto done;
6728 
6729 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6730 	if (view == NULL) {
6731 		error = got_error_from_errno("view_open");
6732 		goto done;
6733 	}
6734 
6735 	error = got_object_open_as_commit(&commit, repo, commit_id);
6736 	if (error)
6737 		goto done;
6738 
6739 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6740 	    commit, repo);
6741 	if (error)
6742 		goto done;
6743 
6744 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6745 	    commit_id, repo);
6746 	if (error)
6747 		goto done;
6748 	if (worktree) {
6749 		/* Release work tree lock. */
6750 		got_worktree_close(worktree);
6751 		worktree = NULL;
6752 	}
6753 	error = view_loop(view);
6754 done:
6755 	free(repo_path);
6756 	free(in_repo_path);
6757 	free(link_target);
6758 	free(cwd);
6759 	free(commit_id);
6760 	if (commit)
6761 		got_object_commit_close(commit);
6762 	if (worktree)
6763 		got_worktree_close(worktree);
6764 	if (repo) {
6765 		const struct got_error *close_err = got_repo_close(repo);
6766 		if (error == NULL)
6767 			error = close_err;
6768 	}
6769 	if (pack_fds) {
6770 		const struct got_error *pack_err =
6771 		    got_repo_pack_fds_close(pack_fds);
6772 		if (error == NULL)
6773 			error = pack_err;
6774 	}
6775 	tog_free_refs();
6776 	return error;
6777 }
6778 
6779 static const struct got_error *
6780 draw_tree_entries(struct tog_view *view, const char *parent_path)
6781 {
6782 	struct tog_tree_view_state *s = &view->state.tree;
6783 	const struct got_error *err = NULL;
6784 	struct got_tree_entry *te;
6785 	wchar_t *wline;
6786 	char *index = NULL;
6787 	struct tog_color *tc;
6788 	int width, n, nentries, scrollx, i = 1;
6789 	int limit = view->nlines;
6790 
6791 	s->ndisplayed = 0;
6792 	if (view_is_hsplit_top(view))
6793 		--limit;  /* border */
6794 
6795 	werase(view->window);
6796 
6797 	if (limit == 0)
6798 		return NULL;
6799 
6800 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6801 	    0, 0);
6802 	if (err)
6803 		return err;
6804 	if (view_needs_focus_indication(view))
6805 		wstandout(view->window);
6806 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6807 	if (tc)
6808 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6809 	waddwstr(view->window, wline);
6810 	free(wline);
6811 	wline = NULL;
6812 	while (width++ < view->ncols)
6813 		waddch(view->window, ' ');
6814 	if (tc)
6815 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6816 	if (view_needs_focus_indication(view))
6817 		wstandend(view->window);
6818 	if (--limit <= 0)
6819 		return NULL;
6820 
6821 	i += s->selected;
6822 	if (s->first_displayed_entry) {
6823 		i += got_tree_entry_get_index(s->first_displayed_entry);
6824 		if (s->tree != s->root)
6825 			++i;  /* account for ".." entry */
6826 	}
6827 	nentries = got_object_tree_get_nentries(s->tree);
6828 	if (asprintf(&index, "[%d/%d] %s",
6829 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6830 		return got_error_from_errno("asprintf");
6831 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6832 	free(index);
6833 	if (err)
6834 		return err;
6835 	waddwstr(view->window, wline);
6836 	free(wline);
6837 	wline = NULL;
6838 	if (width < view->ncols - 1)
6839 		waddch(view->window, '\n');
6840 	if (--limit <= 0)
6841 		return NULL;
6842 	waddch(view->window, '\n');
6843 	if (--limit <= 0)
6844 		return NULL;
6845 
6846 	if (s->first_displayed_entry == NULL) {
6847 		te = got_object_tree_get_first_entry(s->tree);
6848 		if (s->selected == 0) {
6849 			if (view->focussed)
6850 				wstandout(view->window);
6851 			s->selected_entry = NULL;
6852 		}
6853 		waddstr(view->window, "  ..\n");	/* parent directory */
6854 		if (s->selected == 0 && view->focussed)
6855 			wstandend(view->window);
6856 		s->ndisplayed++;
6857 		if (--limit <= 0)
6858 			return NULL;
6859 		n = 1;
6860 	} else {
6861 		n = 0;
6862 		te = s->first_displayed_entry;
6863 	}
6864 
6865 	view->maxx = 0;
6866 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6867 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6868 		const char *modestr = "";
6869 		mode_t mode;
6870 
6871 		te = got_object_tree_get_entry(s->tree, i);
6872 		mode = got_tree_entry_get_mode(te);
6873 
6874 		if (s->show_ids) {
6875 			err = got_object_id_str(&id_str,
6876 			    got_tree_entry_get_id(te));
6877 			if (err)
6878 				return got_error_from_errno(
6879 				    "got_object_id_str");
6880 		}
6881 		if (got_object_tree_entry_is_submodule(te))
6882 			modestr = "$";
6883 		else if (S_ISLNK(mode)) {
6884 			int i;
6885 
6886 			err = got_tree_entry_get_symlink_target(&link_target,
6887 			    te, s->repo);
6888 			if (err) {
6889 				free(id_str);
6890 				return err;
6891 			}
6892 			for (i = 0; i < strlen(link_target); i++) {
6893 				if (!isprint((unsigned char)link_target[i]))
6894 					link_target[i] = '?';
6895 			}
6896 			modestr = "@";
6897 		}
6898 		else if (S_ISDIR(mode))
6899 			modestr = "/";
6900 		else if (mode & S_IXUSR)
6901 			modestr = "*";
6902 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6903 		    got_tree_entry_get_name(te), modestr,
6904 		    link_target ? " -> ": "",
6905 		    link_target ? link_target : "") == -1) {
6906 			free(id_str);
6907 			free(link_target);
6908 			return got_error_from_errno("asprintf");
6909 		}
6910 		free(id_str);
6911 		free(link_target);
6912 
6913 		/* use full line width to determine view->maxx */
6914 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6915 		if (err) {
6916 			free(line);
6917 			break;
6918 		}
6919 		view->maxx = MAX(view->maxx, width);
6920 		free(wline);
6921 		wline = NULL;
6922 
6923 		err = format_line(&wline, &width, &scrollx, line, view->x,
6924 		    view->ncols, 0, 0);
6925 		if (err) {
6926 			free(line);
6927 			break;
6928 		}
6929 		if (n == s->selected) {
6930 			if (view->focussed)
6931 				wstandout(view->window);
6932 			s->selected_entry = te;
6933 		}
6934 		tc = match_color(&s->colors, line);
6935 		if (tc)
6936 			wattr_on(view->window,
6937 			    COLOR_PAIR(tc->colorpair), NULL);
6938 		waddwstr(view->window, &wline[scrollx]);
6939 		if (tc)
6940 			wattr_off(view->window,
6941 			    COLOR_PAIR(tc->colorpair), NULL);
6942 		if (width < view->ncols)
6943 			waddch(view->window, '\n');
6944 		if (n == s->selected && view->focussed)
6945 			wstandend(view->window);
6946 		free(line);
6947 		free(wline);
6948 		wline = NULL;
6949 		n++;
6950 		s->ndisplayed++;
6951 		s->last_displayed_entry = te;
6952 		if (--limit <= 0)
6953 			break;
6954 	}
6955 
6956 	return err;
6957 }
6958 
6959 static void
6960 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6961 {
6962 	struct got_tree_entry *te;
6963 	int isroot = s->tree == s->root;
6964 	int i = 0;
6965 
6966 	if (s->first_displayed_entry == NULL)
6967 		return;
6968 
6969 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6970 	while (i++ < maxscroll) {
6971 		if (te == NULL) {
6972 			if (!isroot)
6973 				s->first_displayed_entry = NULL;
6974 			break;
6975 		}
6976 		s->first_displayed_entry = te;
6977 		te = got_tree_entry_get_prev(s->tree, te);
6978 	}
6979 }
6980 
6981 static const struct got_error *
6982 tree_scroll_down(struct tog_view *view, int maxscroll)
6983 {
6984 	struct tog_tree_view_state *s = &view->state.tree;
6985 	struct got_tree_entry *next, *last;
6986 	int n = 0;
6987 
6988 	if (s->first_displayed_entry)
6989 		next = got_tree_entry_get_next(s->tree,
6990 		    s->first_displayed_entry);
6991 	else
6992 		next = got_object_tree_get_first_entry(s->tree);
6993 
6994 	last = s->last_displayed_entry;
6995 	while (next && n++ < maxscroll) {
6996 		if (last) {
6997 			s->last_displayed_entry = last;
6998 			last = got_tree_entry_get_next(s->tree, last);
6999 		}
7000 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7001 			s->first_displayed_entry = next;
7002 			next = got_tree_entry_get_next(s->tree, next);
7003 		}
7004 	}
7005 
7006 	return NULL;
7007 }
7008 
7009 static const struct got_error *
7010 tree_entry_path(char **path, struct tog_parent_trees *parents,
7011     struct got_tree_entry *te)
7012 {
7013 	const struct got_error *err = NULL;
7014 	struct tog_parent_tree *pt;
7015 	size_t len = 2; /* for leading slash and NUL */
7016 
7017 	TAILQ_FOREACH(pt, parents, entry)
7018 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7019 		    + 1 /* slash */;
7020 	if (te)
7021 		len += strlen(got_tree_entry_get_name(te));
7022 
7023 	*path = calloc(1, len);
7024 	if (path == NULL)
7025 		return got_error_from_errno("calloc");
7026 
7027 	(*path)[0] = '/';
7028 	pt = TAILQ_LAST(parents, tog_parent_trees);
7029 	while (pt) {
7030 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7031 		if (strlcat(*path, name, len) >= len) {
7032 			err = got_error(GOT_ERR_NO_SPACE);
7033 			goto done;
7034 		}
7035 		if (strlcat(*path, "/", len) >= len) {
7036 			err = got_error(GOT_ERR_NO_SPACE);
7037 			goto done;
7038 		}
7039 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7040 	}
7041 	if (te) {
7042 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7043 			err = got_error(GOT_ERR_NO_SPACE);
7044 			goto done;
7045 		}
7046 	}
7047 done:
7048 	if (err) {
7049 		free(*path);
7050 		*path = NULL;
7051 	}
7052 	return err;
7053 }
7054 
7055 static const struct got_error *
7056 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7057     struct got_tree_entry *te, struct tog_parent_trees *parents,
7058     struct got_object_id *commit_id, struct got_repository *repo)
7059 {
7060 	const struct got_error *err = NULL;
7061 	char *path;
7062 	struct tog_view *blame_view;
7063 
7064 	*new_view = NULL;
7065 
7066 	err = tree_entry_path(&path, parents, te);
7067 	if (err)
7068 		return err;
7069 
7070 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7071 	if (blame_view == NULL) {
7072 		err = got_error_from_errno("view_open");
7073 		goto done;
7074 	}
7075 
7076 	err = open_blame_view(blame_view, path, commit_id, repo);
7077 	if (err) {
7078 		if (err->code == GOT_ERR_CANCELLED)
7079 			err = NULL;
7080 		view_close(blame_view);
7081 	} else
7082 		*new_view = blame_view;
7083 done:
7084 	free(path);
7085 	return err;
7086 }
7087 
7088 static const struct got_error *
7089 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7090     struct tog_tree_view_state *s)
7091 {
7092 	struct tog_view *log_view;
7093 	const struct got_error *err = NULL;
7094 	char *path;
7095 
7096 	*new_view = NULL;
7097 
7098 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7099 	if (log_view == NULL)
7100 		return got_error_from_errno("view_open");
7101 
7102 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7103 	if (err)
7104 		return err;
7105 
7106 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7107 	    path, 0);
7108 	if (err)
7109 		view_close(log_view);
7110 	else
7111 		*new_view = log_view;
7112 	free(path);
7113 	return err;
7114 }
7115 
7116 static const struct got_error *
7117 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7118     const char *head_ref_name, struct got_repository *repo)
7119 {
7120 	const struct got_error *err = NULL;
7121 	char *commit_id_str = NULL;
7122 	struct tog_tree_view_state *s = &view->state.tree;
7123 	struct got_commit_object *commit = NULL;
7124 
7125 	TAILQ_INIT(&s->parents);
7126 	STAILQ_INIT(&s->colors);
7127 
7128 	s->commit_id = got_object_id_dup(commit_id);
7129 	if (s->commit_id == NULL)
7130 		return got_error_from_errno("got_object_id_dup");
7131 
7132 	err = got_object_open_as_commit(&commit, repo, commit_id);
7133 	if (err)
7134 		goto done;
7135 
7136 	/*
7137 	 * The root is opened here and will be closed when the view is closed.
7138 	 * Any visited subtrees and their path-wise parents are opened and
7139 	 * closed on demand.
7140 	 */
7141 	err = got_object_open_as_tree(&s->root, repo,
7142 	    got_object_commit_get_tree_id(commit));
7143 	if (err)
7144 		goto done;
7145 	s->tree = s->root;
7146 
7147 	err = got_object_id_str(&commit_id_str, commit_id);
7148 	if (err != NULL)
7149 		goto done;
7150 
7151 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7152 		err = got_error_from_errno("asprintf");
7153 		goto done;
7154 	}
7155 
7156 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7157 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7158 	if (head_ref_name) {
7159 		s->head_ref_name = strdup(head_ref_name);
7160 		if (s->head_ref_name == NULL) {
7161 			err = got_error_from_errno("strdup");
7162 			goto done;
7163 		}
7164 	}
7165 	s->repo = repo;
7166 
7167 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7168 		err = add_color(&s->colors, "\\$$",
7169 		    TOG_COLOR_TREE_SUBMODULE,
7170 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7171 		if (err)
7172 			goto done;
7173 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7174 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7175 		if (err)
7176 			goto done;
7177 		err = add_color(&s->colors, "/$",
7178 		    TOG_COLOR_TREE_DIRECTORY,
7179 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7180 		if (err)
7181 			goto done;
7182 
7183 		err = add_color(&s->colors, "\\*$",
7184 		    TOG_COLOR_TREE_EXECUTABLE,
7185 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7186 		if (err)
7187 			goto done;
7188 
7189 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7190 		    get_color_value("TOG_COLOR_COMMIT"));
7191 		if (err)
7192 			goto done;
7193 	}
7194 
7195 	view->show = show_tree_view;
7196 	view->input = input_tree_view;
7197 	view->close = close_tree_view;
7198 	view->search_start = search_start_tree_view;
7199 	view->search_next = search_next_tree_view;
7200 done:
7201 	free(commit_id_str);
7202 	if (commit)
7203 		got_object_commit_close(commit);
7204 	if (err)
7205 		close_tree_view(view);
7206 	return err;
7207 }
7208 
7209 static const struct got_error *
7210 close_tree_view(struct tog_view *view)
7211 {
7212 	struct tog_tree_view_state *s = &view->state.tree;
7213 
7214 	free_colors(&s->colors);
7215 	free(s->tree_label);
7216 	s->tree_label = NULL;
7217 	free(s->commit_id);
7218 	s->commit_id = NULL;
7219 	free(s->head_ref_name);
7220 	s->head_ref_name = NULL;
7221 	while (!TAILQ_EMPTY(&s->parents)) {
7222 		struct tog_parent_tree *parent;
7223 		parent = TAILQ_FIRST(&s->parents);
7224 		TAILQ_REMOVE(&s->parents, parent, entry);
7225 		if (parent->tree != s->root)
7226 			got_object_tree_close(parent->tree);
7227 		free(parent);
7228 
7229 	}
7230 	if (s->tree != NULL && s->tree != s->root)
7231 		got_object_tree_close(s->tree);
7232 	if (s->root)
7233 		got_object_tree_close(s->root);
7234 	return NULL;
7235 }
7236 
7237 static const struct got_error *
7238 search_start_tree_view(struct tog_view *view)
7239 {
7240 	struct tog_tree_view_state *s = &view->state.tree;
7241 
7242 	s->matched_entry = NULL;
7243 	return NULL;
7244 }
7245 
7246 static int
7247 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7248 {
7249 	regmatch_t regmatch;
7250 
7251 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7252 	    0) == 0;
7253 }
7254 
7255 static const struct got_error *
7256 search_next_tree_view(struct tog_view *view)
7257 {
7258 	struct tog_tree_view_state *s = &view->state.tree;
7259 	struct got_tree_entry *te = NULL;
7260 
7261 	if (!view->searching) {
7262 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7263 		return NULL;
7264 	}
7265 
7266 	if (s->matched_entry) {
7267 		if (view->searching == TOG_SEARCH_FORWARD) {
7268 			if (s->selected_entry)
7269 				te = got_tree_entry_get_next(s->tree,
7270 				    s->selected_entry);
7271 			else
7272 				te = got_object_tree_get_first_entry(s->tree);
7273 		} else {
7274 			if (s->selected_entry == NULL)
7275 				te = got_object_tree_get_last_entry(s->tree);
7276 			else
7277 				te = got_tree_entry_get_prev(s->tree,
7278 				    s->selected_entry);
7279 		}
7280 	} else {
7281 		if (s->selected_entry)
7282 			te = s->selected_entry;
7283 		else if (view->searching == TOG_SEARCH_FORWARD)
7284 			te = got_object_tree_get_first_entry(s->tree);
7285 		else
7286 			te = got_object_tree_get_last_entry(s->tree);
7287 	}
7288 
7289 	while (1) {
7290 		if (te == NULL) {
7291 			if (s->matched_entry == NULL) {
7292 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7293 				return NULL;
7294 			}
7295 			if (view->searching == TOG_SEARCH_FORWARD)
7296 				te = got_object_tree_get_first_entry(s->tree);
7297 			else
7298 				te = got_object_tree_get_last_entry(s->tree);
7299 		}
7300 
7301 		if (match_tree_entry(te, &view->regex)) {
7302 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7303 			s->matched_entry = te;
7304 			break;
7305 		}
7306 
7307 		if (view->searching == TOG_SEARCH_FORWARD)
7308 			te = got_tree_entry_get_next(s->tree, te);
7309 		else
7310 			te = got_tree_entry_get_prev(s->tree, te);
7311 	}
7312 
7313 	if (s->matched_entry) {
7314 		s->first_displayed_entry = s->matched_entry;
7315 		s->selected = 0;
7316 	}
7317 
7318 	return NULL;
7319 }
7320 
7321 static const struct got_error *
7322 show_tree_view(struct tog_view *view)
7323 {
7324 	const struct got_error *err = NULL;
7325 	struct tog_tree_view_state *s = &view->state.tree;
7326 	char *parent_path;
7327 
7328 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7329 	if (err)
7330 		return err;
7331 
7332 	err = draw_tree_entries(view, parent_path);
7333 	free(parent_path);
7334 
7335 	view_border(view);
7336 	return err;
7337 }
7338 
7339 static const struct got_error *
7340 tree_goto_line(struct tog_view *view, int nlines)
7341 {
7342 	const struct got_error		 *err = NULL;
7343 	struct tog_tree_view_state	 *s = &view->state.tree;
7344 	struct got_tree_entry		**fte, **lte, **ste;
7345 	int				  g, last, first = 1, i = 1;
7346 	int				  root = s->tree == s->root;
7347 	int				  off = root ? 1 : 2;
7348 
7349 	g = view->gline;
7350 	view->gline = 0;
7351 
7352 	if (g == 0)
7353 		g = 1;
7354 	else if (g > got_object_tree_get_nentries(s->tree))
7355 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7356 
7357 	fte = &s->first_displayed_entry;
7358 	lte = &s->last_displayed_entry;
7359 	ste = &s->selected_entry;
7360 
7361 	if (*fte != NULL) {
7362 		first = got_tree_entry_get_index(*fte);
7363 		first += off;  /* account for ".." */
7364 	}
7365 	last = got_tree_entry_get_index(*lte);
7366 	last += off;
7367 
7368 	if (g >= first && g <= last && g - first < nlines) {
7369 		s->selected = g - first;
7370 		return NULL;	/* gline is on the current page */
7371 	}
7372 
7373 	if (*ste != NULL) {
7374 		i = got_tree_entry_get_index(*ste);
7375 		i += off;
7376 	}
7377 
7378 	if (i < g) {
7379 		err = tree_scroll_down(view, g - i);
7380 		if (err)
7381 			return err;
7382 		if (got_tree_entry_get_index(*lte) >=
7383 		    got_object_tree_get_nentries(s->tree) - 1 &&
7384 		    first + s->selected < g &&
7385 		    s->selected < s->ndisplayed - 1) {
7386 			first = got_tree_entry_get_index(*fte);
7387 			first += off;
7388 			s->selected = g - first;
7389 		}
7390 	} else if (i > g)
7391 		tree_scroll_up(s, i - g);
7392 
7393 	if (g < nlines &&
7394 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7395 		s->selected = g - 1;
7396 
7397 	return NULL;
7398 }
7399 
7400 static const struct got_error *
7401 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7402 {
7403 	const struct got_error *err = NULL;
7404 	struct tog_tree_view_state *s = &view->state.tree;
7405 	struct got_tree_entry *te;
7406 	int n, nscroll = view->nlines - 3;
7407 
7408 	if (view->gline)
7409 		return tree_goto_line(view, nscroll);
7410 
7411 	switch (ch) {
7412 	case '0':
7413 	case '$':
7414 	case KEY_RIGHT:
7415 	case 'l':
7416 	case KEY_LEFT:
7417 	case 'h':
7418 		horizontal_scroll_input(view, ch);
7419 		break;
7420 	case 'i':
7421 		s->show_ids = !s->show_ids;
7422 		view->count = 0;
7423 		break;
7424 	case 'L':
7425 		view->count = 0;
7426 		if (!s->selected_entry)
7427 			break;
7428 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7429 		break;
7430 	case 'R':
7431 		view->count = 0;
7432 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7433 		break;
7434 	case 'g':
7435 	case '=':
7436 	case KEY_HOME:
7437 		s->selected = 0;
7438 		view->count = 0;
7439 		if (s->tree == s->root)
7440 			s->first_displayed_entry =
7441 			    got_object_tree_get_first_entry(s->tree);
7442 		else
7443 			s->first_displayed_entry = NULL;
7444 		break;
7445 	case 'G':
7446 	case '*':
7447 	case KEY_END: {
7448 		int eos = view->nlines - 3;
7449 
7450 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7451 			--eos;  /* border */
7452 		s->selected = 0;
7453 		view->count = 0;
7454 		te = got_object_tree_get_last_entry(s->tree);
7455 		for (n = 0; n < eos; n++) {
7456 			if (te == NULL) {
7457 				if (s->tree != s->root) {
7458 					s->first_displayed_entry = NULL;
7459 					n++;
7460 				}
7461 				break;
7462 			}
7463 			s->first_displayed_entry = te;
7464 			te = got_tree_entry_get_prev(s->tree, te);
7465 		}
7466 		if (n > 0)
7467 			s->selected = n - 1;
7468 		break;
7469 	}
7470 	case 'k':
7471 	case KEY_UP:
7472 	case CTRL('p'):
7473 		if (s->selected > 0) {
7474 			s->selected--;
7475 			break;
7476 		}
7477 		tree_scroll_up(s, 1);
7478 		if (s->selected_entry == NULL ||
7479 		    (s->tree == s->root && s->selected_entry ==
7480 		     got_object_tree_get_first_entry(s->tree)))
7481 			view->count = 0;
7482 		break;
7483 	case CTRL('u'):
7484 	case 'u':
7485 		nscroll /= 2;
7486 		/* FALL THROUGH */
7487 	case KEY_PPAGE:
7488 	case CTRL('b'):
7489 	case 'b':
7490 		if (s->tree == s->root) {
7491 			if (got_object_tree_get_first_entry(s->tree) ==
7492 			    s->first_displayed_entry)
7493 				s->selected -= MIN(s->selected, nscroll);
7494 		} else {
7495 			if (s->first_displayed_entry == NULL)
7496 				s->selected -= MIN(s->selected, nscroll);
7497 		}
7498 		tree_scroll_up(s, MAX(0, nscroll));
7499 		if (s->selected_entry == NULL ||
7500 		    (s->tree == s->root && s->selected_entry ==
7501 		     got_object_tree_get_first_entry(s->tree)))
7502 			view->count = 0;
7503 		break;
7504 	case 'j':
7505 	case KEY_DOWN:
7506 	case CTRL('n'):
7507 		if (s->selected < s->ndisplayed - 1) {
7508 			s->selected++;
7509 			break;
7510 		}
7511 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7512 		    == NULL) {
7513 			/* can't scroll any further */
7514 			view->count = 0;
7515 			break;
7516 		}
7517 		tree_scroll_down(view, 1);
7518 		break;
7519 	case CTRL('d'):
7520 	case 'd':
7521 		nscroll /= 2;
7522 		/* FALL THROUGH */
7523 	case KEY_NPAGE:
7524 	case CTRL('f'):
7525 	case 'f':
7526 	case ' ':
7527 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7528 		    == NULL) {
7529 			/* can't scroll any further; move cursor down */
7530 			if (s->selected < s->ndisplayed - 1)
7531 				s->selected += MIN(nscroll,
7532 				    s->ndisplayed - s->selected - 1);
7533 			else
7534 				view->count = 0;
7535 			break;
7536 		}
7537 		tree_scroll_down(view, nscroll);
7538 		break;
7539 	case KEY_ENTER:
7540 	case '\r':
7541 	case KEY_BACKSPACE:
7542 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7543 			struct tog_parent_tree *parent;
7544 			/* user selected '..' */
7545 			if (s->tree == s->root) {
7546 				view->count = 0;
7547 				break;
7548 			}
7549 			parent = TAILQ_FIRST(&s->parents);
7550 			TAILQ_REMOVE(&s->parents, parent,
7551 			    entry);
7552 			got_object_tree_close(s->tree);
7553 			s->tree = parent->tree;
7554 			s->first_displayed_entry =
7555 			    parent->first_displayed_entry;
7556 			s->selected_entry =
7557 			    parent->selected_entry;
7558 			s->selected = parent->selected;
7559 			if (s->selected > view->nlines - 3) {
7560 				err = offset_selection_down(view);
7561 				if (err)
7562 					break;
7563 			}
7564 			free(parent);
7565 		} else if (S_ISDIR(got_tree_entry_get_mode(
7566 		    s->selected_entry))) {
7567 			struct got_tree_object *subtree;
7568 			view->count = 0;
7569 			err = got_object_open_as_tree(&subtree, s->repo,
7570 			    got_tree_entry_get_id(s->selected_entry));
7571 			if (err)
7572 				break;
7573 			err = tree_view_visit_subtree(s, subtree);
7574 			if (err) {
7575 				got_object_tree_close(subtree);
7576 				break;
7577 			}
7578 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7579 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7580 		break;
7581 	case KEY_RESIZE:
7582 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7583 			s->selected = view->nlines - 4;
7584 		view->count = 0;
7585 		break;
7586 	default:
7587 		view->count = 0;
7588 		break;
7589 	}
7590 
7591 	return err;
7592 }
7593 
7594 __dead static void
7595 usage_tree(void)
7596 {
7597 	endwin();
7598 	fprintf(stderr,
7599 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7600 	    getprogname());
7601 	exit(1);
7602 }
7603 
7604 static const struct got_error *
7605 cmd_tree(int argc, char *argv[])
7606 {
7607 	const struct got_error *error;
7608 	struct got_repository *repo = NULL;
7609 	struct got_worktree *worktree = NULL;
7610 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7611 	struct got_object_id *commit_id = NULL;
7612 	struct got_commit_object *commit = NULL;
7613 	const char *commit_id_arg = NULL;
7614 	char *label = NULL;
7615 	struct got_reference *ref = NULL;
7616 	const char *head_ref_name = NULL;
7617 	int ch;
7618 	struct tog_view *view;
7619 	int *pack_fds = NULL;
7620 
7621 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7622 		switch (ch) {
7623 		case 'c':
7624 			commit_id_arg = optarg;
7625 			break;
7626 		case 'r':
7627 			repo_path = realpath(optarg, NULL);
7628 			if (repo_path == NULL)
7629 				return got_error_from_errno2("realpath",
7630 				    optarg);
7631 			break;
7632 		default:
7633 			usage_tree();
7634 			/* NOTREACHED */
7635 		}
7636 	}
7637 
7638 	argc -= optind;
7639 	argv += optind;
7640 
7641 	if (argc > 1)
7642 		usage_tree();
7643 
7644 	error = got_repo_pack_fds_open(&pack_fds);
7645 	if (error != NULL)
7646 		goto done;
7647 
7648 	if (repo_path == NULL) {
7649 		cwd = getcwd(NULL, 0);
7650 		if (cwd == NULL)
7651 			return got_error_from_errno("getcwd");
7652 		error = got_worktree_open(&worktree, cwd);
7653 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7654 			goto done;
7655 		if (worktree)
7656 			repo_path =
7657 			    strdup(got_worktree_get_repo_path(worktree));
7658 		else
7659 			repo_path = strdup(cwd);
7660 		if (repo_path == NULL) {
7661 			error = got_error_from_errno("strdup");
7662 			goto done;
7663 		}
7664 	}
7665 
7666 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7667 	if (error != NULL)
7668 		goto done;
7669 
7670 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7671 	    repo, worktree);
7672 	if (error)
7673 		goto done;
7674 
7675 	init_curses();
7676 
7677 	error = apply_unveil(got_repo_get_path(repo), NULL);
7678 	if (error)
7679 		goto done;
7680 
7681 	error = tog_load_refs(repo, 0);
7682 	if (error)
7683 		goto done;
7684 
7685 	if (commit_id_arg == NULL) {
7686 		error = got_repo_match_object_id(&commit_id, &label,
7687 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7688 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7689 		if (error)
7690 			goto done;
7691 		head_ref_name = label;
7692 	} else {
7693 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7694 		if (error == NULL)
7695 			head_ref_name = got_ref_get_name(ref);
7696 		else if (error->code != GOT_ERR_NOT_REF)
7697 			goto done;
7698 		error = got_repo_match_object_id(&commit_id, NULL,
7699 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7700 		if (error)
7701 			goto done;
7702 	}
7703 
7704 	error = got_object_open_as_commit(&commit, repo, commit_id);
7705 	if (error)
7706 		goto done;
7707 
7708 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7709 	if (view == NULL) {
7710 		error = got_error_from_errno("view_open");
7711 		goto done;
7712 	}
7713 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7714 	if (error)
7715 		goto done;
7716 	if (!got_path_is_root_dir(in_repo_path)) {
7717 		error = tree_view_walk_path(&view->state.tree, commit,
7718 		    in_repo_path);
7719 		if (error)
7720 			goto done;
7721 	}
7722 
7723 	if (worktree) {
7724 		/* Release work tree lock. */
7725 		got_worktree_close(worktree);
7726 		worktree = NULL;
7727 	}
7728 	error = view_loop(view);
7729 done:
7730 	free(repo_path);
7731 	free(cwd);
7732 	free(commit_id);
7733 	free(label);
7734 	if (ref)
7735 		got_ref_close(ref);
7736 	if (repo) {
7737 		const struct got_error *close_err = got_repo_close(repo);
7738 		if (error == NULL)
7739 			error = close_err;
7740 	}
7741 	if (pack_fds) {
7742 		const struct got_error *pack_err =
7743 		    got_repo_pack_fds_close(pack_fds);
7744 		if (error == NULL)
7745 			error = pack_err;
7746 	}
7747 	tog_free_refs();
7748 	return error;
7749 }
7750 
7751 static const struct got_error *
7752 ref_view_load_refs(struct tog_ref_view_state *s)
7753 {
7754 	struct got_reflist_entry *sre;
7755 	struct tog_reflist_entry *re;
7756 
7757 	s->nrefs = 0;
7758 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7759 		if (strncmp(got_ref_get_name(sre->ref),
7760 		    "refs/got/", 9) == 0 &&
7761 		    strncmp(got_ref_get_name(sre->ref),
7762 		    "refs/got/backup/", 16) != 0)
7763 			continue;
7764 
7765 		re = malloc(sizeof(*re));
7766 		if (re == NULL)
7767 			return got_error_from_errno("malloc");
7768 
7769 		re->ref = got_ref_dup(sre->ref);
7770 		if (re->ref == NULL)
7771 			return got_error_from_errno("got_ref_dup");
7772 		re->idx = s->nrefs++;
7773 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7774 	}
7775 
7776 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7777 	return NULL;
7778 }
7779 
7780 static void
7781 ref_view_free_refs(struct tog_ref_view_state *s)
7782 {
7783 	struct tog_reflist_entry *re;
7784 
7785 	while (!TAILQ_EMPTY(&s->refs)) {
7786 		re = TAILQ_FIRST(&s->refs);
7787 		TAILQ_REMOVE(&s->refs, re, entry);
7788 		got_ref_close(re->ref);
7789 		free(re);
7790 	}
7791 }
7792 
7793 static const struct got_error *
7794 open_ref_view(struct tog_view *view, struct got_repository *repo)
7795 {
7796 	const struct got_error *err = NULL;
7797 	struct tog_ref_view_state *s = &view->state.ref;
7798 
7799 	s->selected_entry = 0;
7800 	s->repo = repo;
7801 
7802 	TAILQ_INIT(&s->refs);
7803 	STAILQ_INIT(&s->colors);
7804 
7805 	err = ref_view_load_refs(s);
7806 	if (err)
7807 		return err;
7808 
7809 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7810 		err = add_color(&s->colors, "^refs/heads/",
7811 		    TOG_COLOR_REFS_HEADS,
7812 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7813 		if (err)
7814 			goto done;
7815 
7816 		err = add_color(&s->colors, "^refs/tags/",
7817 		    TOG_COLOR_REFS_TAGS,
7818 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7819 		if (err)
7820 			goto done;
7821 
7822 		err = add_color(&s->colors, "^refs/remotes/",
7823 		    TOG_COLOR_REFS_REMOTES,
7824 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7825 		if (err)
7826 			goto done;
7827 
7828 		err = add_color(&s->colors, "^refs/got/backup/",
7829 		    TOG_COLOR_REFS_BACKUP,
7830 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7831 		if (err)
7832 			goto done;
7833 	}
7834 
7835 	view->show = show_ref_view;
7836 	view->input = input_ref_view;
7837 	view->close = close_ref_view;
7838 	view->search_start = search_start_ref_view;
7839 	view->search_next = search_next_ref_view;
7840 done:
7841 	if (err)
7842 		free_colors(&s->colors);
7843 	return err;
7844 }
7845 
7846 static const struct got_error *
7847 close_ref_view(struct tog_view *view)
7848 {
7849 	struct tog_ref_view_state *s = &view->state.ref;
7850 
7851 	ref_view_free_refs(s);
7852 	free_colors(&s->colors);
7853 
7854 	return NULL;
7855 }
7856 
7857 static const struct got_error *
7858 resolve_reflist_entry(struct got_object_id **commit_id,
7859     struct tog_reflist_entry *re, struct got_repository *repo)
7860 {
7861 	const struct got_error *err = NULL;
7862 	struct got_object_id *obj_id;
7863 	struct got_tag_object *tag = NULL;
7864 	int obj_type;
7865 
7866 	*commit_id = NULL;
7867 
7868 	err = got_ref_resolve(&obj_id, repo, re->ref);
7869 	if (err)
7870 		return err;
7871 
7872 	err = got_object_get_type(&obj_type, repo, obj_id);
7873 	if (err)
7874 		goto done;
7875 
7876 	switch (obj_type) {
7877 	case GOT_OBJ_TYPE_COMMIT:
7878 		*commit_id = obj_id;
7879 		break;
7880 	case GOT_OBJ_TYPE_TAG:
7881 		err = got_object_open_as_tag(&tag, repo, obj_id);
7882 		if (err)
7883 			goto done;
7884 		free(obj_id);
7885 		err = got_object_get_type(&obj_type, repo,
7886 		    got_object_tag_get_object_id(tag));
7887 		if (err)
7888 			goto done;
7889 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7890 			err = got_error(GOT_ERR_OBJ_TYPE);
7891 			goto done;
7892 		}
7893 		*commit_id = got_object_id_dup(
7894 		    got_object_tag_get_object_id(tag));
7895 		if (*commit_id == NULL) {
7896 			err = got_error_from_errno("got_object_id_dup");
7897 			goto done;
7898 		}
7899 		break;
7900 	default:
7901 		err = got_error(GOT_ERR_OBJ_TYPE);
7902 		break;
7903 	}
7904 
7905 done:
7906 	if (tag)
7907 		got_object_tag_close(tag);
7908 	if (err) {
7909 		free(*commit_id);
7910 		*commit_id = NULL;
7911 	}
7912 	return err;
7913 }
7914 
7915 static const struct got_error *
7916 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7917     struct tog_reflist_entry *re, struct got_repository *repo)
7918 {
7919 	struct tog_view *log_view;
7920 	const struct got_error *err = NULL;
7921 	struct got_object_id *commit_id = NULL;
7922 
7923 	*new_view = NULL;
7924 
7925 	err = resolve_reflist_entry(&commit_id, re, repo);
7926 	if (err) {
7927 		if (err->code != GOT_ERR_OBJ_TYPE)
7928 			return err;
7929 		else
7930 			return NULL;
7931 	}
7932 
7933 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7934 	if (log_view == NULL) {
7935 		err = got_error_from_errno("view_open");
7936 		goto done;
7937 	}
7938 
7939 	err = open_log_view(log_view, commit_id, repo,
7940 	    got_ref_get_name(re->ref), "", 0);
7941 done:
7942 	if (err)
7943 		view_close(log_view);
7944 	else
7945 		*new_view = log_view;
7946 	free(commit_id);
7947 	return err;
7948 }
7949 
7950 static void
7951 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7952 {
7953 	struct tog_reflist_entry *re;
7954 	int i = 0;
7955 
7956 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7957 		return;
7958 
7959 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7960 	while (i++ < maxscroll) {
7961 		if (re == NULL)
7962 			break;
7963 		s->first_displayed_entry = re;
7964 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7965 	}
7966 }
7967 
7968 static const struct got_error *
7969 ref_scroll_down(struct tog_view *view, int maxscroll)
7970 {
7971 	struct tog_ref_view_state *s = &view->state.ref;
7972 	struct tog_reflist_entry *next, *last;
7973 	int n = 0;
7974 
7975 	if (s->first_displayed_entry)
7976 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7977 	else
7978 		next = TAILQ_FIRST(&s->refs);
7979 
7980 	last = s->last_displayed_entry;
7981 	while (next && n++ < maxscroll) {
7982 		if (last) {
7983 			s->last_displayed_entry = last;
7984 			last = TAILQ_NEXT(last, entry);
7985 		}
7986 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7987 			s->first_displayed_entry = next;
7988 			next = TAILQ_NEXT(next, entry);
7989 		}
7990 	}
7991 
7992 	return NULL;
7993 }
7994 
7995 static const struct got_error *
7996 search_start_ref_view(struct tog_view *view)
7997 {
7998 	struct tog_ref_view_state *s = &view->state.ref;
7999 
8000 	s->matched_entry = NULL;
8001 	return NULL;
8002 }
8003 
8004 static int
8005 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8006 {
8007 	regmatch_t regmatch;
8008 
8009 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8010 	    0) == 0;
8011 }
8012 
8013 static const struct got_error *
8014 search_next_ref_view(struct tog_view *view)
8015 {
8016 	struct tog_ref_view_state *s = &view->state.ref;
8017 	struct tog_reflist_entry *re = NULL;
8018 
8019 	if (!view->searching) {
8020 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8021 		return NULL;
8022 	}
8023 
8024 	if (s->matched_entry) {
8025 		if (view->searching == TOG_SEARCH_FORWARD) {
8026 			if (s->selected_entry)
8027 				re = TAILQ_NEXT(s->selected_entry, entry);
8028 			else
8029 				re = TAILQ_PREV(s->selected_entry,
8030 				    tog_reflist_head, entry);
8031 		} else {
8032 			if (s->selected_entry == NULL)
8033 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8034 			else
8035 				re = TAILQ_PREV(s->selected_entry,
8036 				    tog_reflist_head, entry);
8037 		}
8038 	} else {
8039 		if (s->selected_entry)
8040 			re = s->selected_entry;
8041 		else if (view->searching == TOG_SEARCH_FORWARD)
8042 			re = TAILQ_FIRST(&s->refs);
8043 		else
8044 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8045 	}
8046 
8047 	while (1) {
8048 		if (re == NULL) {
8049 			if (s->matched_entry == NULL) {
8050 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8051 				return NULL;
8052 			}
8053 			if (view->searching == TOG_SEARCH_FORWARD)
8054 				re = TAILQ_FIRST(&s->refs);
8055 			else
8056 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8057 		}
8058 
8059 		if (match_reflist_entry(re, &view->regex)) {
8060 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8061 			s->matched_entry = re;
8062 			break;
8063 		}
8064 
8065 		if (view->searching == TOG_SEARCH_FORWARD)
8066 			re = TAILQ_NEXT(re, entry);
8067 		else
8068 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8069 	}
8070 
8071 	if (s->matched_entry) {
8072 		s->first_displayed_entry = s->matched_entry;
8073 		s->selected = 0;
8074 	}
8075 
8076 	return NULL;
8077 }
8078 
8079 static const struct got_error *
8080 show_ref_view(struct tog_view *view)
8081 {
8082 	const struct got_error *err = NULL;
8083 	struct tog_ref_view_state *s = &view->state.ref;
8084 	struct tog_reflist_entry *re;
8085 	char *line = NULL;
8086 	wchar_t *wline;
8087 	struct tog_color *tc;
8088 	int width, n, scrollx;
8089 	int limit = view->nlines;
8090 
8091 	werase(view->window);
8092 
8093 	s->ndisplayed = 0;
8094 	if (view_is_hsplit_top(view))
8095 		--limit;  /* border */
8096 
8097 	if (limit == 0)
8098 		return NULL;
8099 
8100 	re = s->first_displayed_entry;
8101 
8102 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8103 	    s->nrefs) == -1)
8104 		return got_error_from_errno("asprintf");
8105 
8106 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8107 	if (err) {
8108 		free(line);
8109 		return err;
8110 	}
8111 	if (view_needs_focus_indication(view))
8112 		wstandout(view->window);
8113 	waddwstr(view->window, wline);
8114 	while (width++ < view->ncols)
8115 		waddch(view->window, ' ');
8116 	if (view_needs_focus_indication(view))
8117 		wstandend(view->window);
8118 	free(wline);
8119 	wline = NULL;
8120 	free(line);
8121 	line = NULL;
8122 	if (--limit <= 0)
8123 		return NULL;
8124 
8125 	n = 0;
8126 	view->maxx = 0;
8127 	while (re && limit > 0) {
8128 		char *line = NULL;
8129 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8130 
8131 		if (s->show_date) {
8132 			struct got_commit_object *ci;
8133 			struct got_tag_object *tag;
8134 			struct got_object_id *id;
8135 			struct tm tm;
8136 			time_t t;
8137 
8138 			err = got_ref_resolve(&id, s->repo, re->ref);
8139 			if (err)
8140 				return err;
8141 			err = got_object_open_as_tag(&tag, s->repo, id);
8142 			if (err) {
8143 				if (err->code != GOT_ERR_OBJ_TYPE) {
8144 					free(id);
8145 					return err;
8146 				}
8147 				err = got_object_open_as_commit(&ci, s->repo,
8148 				    id);
8149 				if (err) {
8150 					free(id);
8151 					return err;
8152 				}
8153 				t = got_object_commit_get_committer_time(ci);
8154 				got_object_commit_close(ci);
8155 			} else {
8156 				t = got_object_tag_get_tagger_time(tag);
8157 				got_object_tag_close(tag);
8158 			}
8159 			free(id);
8160 			if (gmtime_r(&t, &tm) == NULL)
8161 				return got_error_from_errno("gmtime_r");
8162 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8163 				return got_error(GOT_ERR_NO_SPACE);
8164 		}
8165 		if (got_ref_is_symbolic(re->ref)) {
8166 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8167 			    ymd : "", got_ref_get_name(re->ref),
8168 			    got_ref_get_symref_target(re->ref)) == -1)
8169 				return got_error_from_errno("asprintf");
8170 		} else if (s->show_ids) {
8171 			struct got_object_id *id;
8172 			char *id_str;
8173 			err = got_ref_resolve(&id, s->repo, re->ref);
8174 			if (err)
8175 				return err;
8176 			err = got_object_id_str(&id_str, id);
8177 			if (err) {
8178 				free(id);
8179 				return err;
8180 			}
8181 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8182 			    got_ref_get_name(re->ref), id_str) == -1) {
8183 				err = got_error_from_errno("asprintf");
8184 				free(id);
8185 				free(id_str);
8186 				return err;
8187 			}
8188 			free(id);
8189 			free(id_str);
8190 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8191 		    got_ref_get_name(re->ref)) == -1)
8192 			return got_error_from_errno("asprintf");
8193 
8194 		/* use full line width to determine view->maxx */
8195 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8196 		if (err) {
8197 			free(line);
8198 			return err;
8199 		}
8200 		view->maxx = MAX(view->maxx, width);
8201 		free(wline);
8202 		wline = NULL;
8203 
8204 		err = format_line(&wline, &width, &scrollx, line, view->x,
8205 		    view->ncols, 0, 0);
8206 		if (err) {
8207 			free(line);
8208 			return err;
8209 		}
8210 		if (n == s->selected) {
8211 			if (view->focussed)
8212 				wstandout(view->window);
8213 			s->selected_entry = re;
8214 		}
8215 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8216 		if (tc)
8217 			wattr_on(view->window,
8218 			    COLOR_PAIR(tc->colorpair), NULL);
8219 		waddwstr(view->window, &wline[scrollx]);
8220 		if (tc)
8221 			wattr_off(view->window,
8222 			    COLOR_PAIR(tc->colorpair), NULL);
8223 		if (width < view->ncols)
8224 			waddch(view->window, '\n');
8225 		if (n == s->selected && view->focussed)
8226 			wstandend(view->window);
8227 		free(line);
8228 		free(wline);
8229 		wline = NULL;
8230 		n++;
8231 		s->ndisplayed++;
8232 		s->last_displayed_entry = re;
8233 
8234 		limit--;
8235 		re = TAILQ_NEXT(re, entry);
8236 	}
8237 
8238 	view_border(view);
8239 	return err;
8240 }
8241 
8242 static const struct got_error *
8243 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8244     struct tog_reflist_entry *re, struct got_repository *repo)
8245 {
8246 	const struct got_error *err = NULL;
8247 	struct got_object_id *commit_id = NULL;
8248 	struct tog_view *tree_view;
8249 
8250 	*new_view = NULL;
8251 
8252 	err = resolve_reflist_entry(&commit_id, re, repo);
8253 	if (err) {
8254 		if (err->code != GOT_ERR_OBJ_TYPE)
8255 			return err;
8256 		else
8257 			return NULL;
8258 	}
8259 
8260 
8261 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8262 	if (tree_view == NULL) {
8263 		err = got_error_from_errno("view_open");
8264 		goto done;
8265 	}
8266 
8267 	err = open_tree_view(tree_view, commit_id,
8268 	    got_ref_get_name(re->ref), repo);
8269 	if (err)
8270 		goto done;
8271 
8272 	*new_view = tree_view;
8273 done:
8274 	free(commit_id);
8275 	return err;
8276 }
8277 
8278 static const struct got_error *
8279 ref_goto_line(struct tog_view *view, int nlines)
8280 {
8281 	const struct got_error		*err = NULL;
8282 	struct tog_ref_view_state	*s = &view->state.ref;
8283 	int				 g, idx = s->selected_entry->idx;
8284 
8285 	g = view->gline;
8286 	view->gline = 0;
8287 
8288 	if (g == 0)
8289 		g = 1;
8290 	else if (g > s->nrefs)
8291 		g = s->nrefs;
8292 
8293 	if (g >= s->first_displayed_entry->idx + 1 &&
8294 	    g <= s->last_displayed_entry->idx + 1 &&
8295 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8296 		s->selected = g - s->first_displayed_entry->idx - 1;
8297 		return NULL;
8298 	}
8299 
8300 	if (idx + 1 < g) {
8301 		err = ref_scroll_down(view, g - idx - 1);
8302 		if (err)
8303 			return err;
8304 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8305 		    s->first_displayed_entry->idx + s->selected < g &&
8306 		    s->selected < s->ndisplayed - 1)
8307 			s->selected = g - s->first_displayed_entry->idx - 1;
8308 	} else if (idx + 1 > g)
8309 		ref_scroll_up(s, idx - g + 1);
8310 
8311 	if (g < nlines && s->first_displayed_entry->idx == 0)
8312 		s->selected = g - 1;
8313 
8314 	return NULL;
8315 
8316 }
8317 
8318 static const struct got_error *
8319 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8320 {
8321 	const struct got_error *err = NULL;
8322 	struct tog_ref_view_state *s = &view->state.ref;
8323 	struct tog_reflist_entry *re;
8324 	int n, nscroll = view->nlines - 1;
8325 
8326 	if (view->gline)
8327 		return ref_goto_line(view, nscroll);
8328 
8329 	switch (ch) {
8330 	case '0':
8331 	case '$':
8332 	case KEY_RIGHT:
8333 	case 'l':
8334 	case KEY_LEFT:
8335 	case 'h':
8336 		horizontal_scroll_input(view, ch);
8337 		break;
8338 	case 'i':
8339 		s->show_ids = !s->show_ids;
8340 		view->count = 0;
8341 		break;
8342 	case 'm':
8343 		s->show_date = !s->show_date;
8344 		view->count = 0;
8345 		break;
8346 	case 'o':
8347 		s->sort_by_date = !s->sort_by_date;
8348 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8349 		view->count = 0;
8350 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8351 		    got_ref_cmp_by_commit_timestamp_descending :
8352 		    tog_ref_cmp_by_name, s->repo);
8353 		if (err)
8354 			break;
8355 		got_reflist_object_id_map_free(tog_refs_idmap);
8356 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8357 		    &tog_refs, s->repo);
8358 		if (err)
8359 			break;
8360 		ref_view_free_refs(s);
8361 		err = ref_view_load_refs(s);
8362 		break;
8363 	case KEY_ENTER:
8364 	case '\r':
8365 		view->count = 0;
8366 		if (!s->selected_entry)
8367 			break;
8368 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8369 		break;
8370 	case 'T':
8371 		view->count = 0;
8372 		if (!s->selected_entry)
8373 			break;
8374 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8375 		break;
8376 	case 'g':
8377 	case '=':
8378 	case KEY_HOME:
8379 		s->selected = 0;
8380 		view->count = 0;
8381 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8382 		break;
8383 	case 'G':
8384 	case '*':
8385 	case KEY_END: {
8386 		int eos = view->nlines - 1;
8387 
8388 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8389 			--eos;  /* border */
8390 		s->selected = 0;
8391 		view->count = 0;
8392 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8393 		for (n = 0; n < eos; n++) {
8394 			if (re == NULL)
8395 				break;
8396 			s->first_displayed_entry = re;
8397 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8398 		}
8399 		if (n > 0)
8400 			s->selected = n - 1;
8401 		break;
8402 	}
8403 	case 'k':
8404 	case KEY_UP:
8405 	case CTRL('p'):
8406 		if (s->selected > 0) {
8407 			s->selected--;
8408 			break;
8409 		}
8410 		ref_scroll_up(s, 1);
8411 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8412 			view->count = 0;
8413 		break;
8414 	case CTRL('u'):
8415 	case 'u':
8416 		nscroll /= 2;
8417 		/* FALL THROUGH */
8418 	case KEY_PPAGE:
8419 	case CTRL('b'):
8420 	case 'b':
8421 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8422 			s->selected -= MIN(nscroll, s->selected);
8423 		ref_scroll_up(s, MAX(0, nscroll));
8424 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8425 			view->count = 0;
8426 		break;
8427 	case 'j':
8428 	case KEY_DOWN:
8429 	case CTRL('n'):
8430 		if (s->selected < s->ndisplayed - 1) {
8431 			s->selected++;
8432 			break;
8433 		}
8434 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8435 			/* can't scroll any further */
8436 			view->count = 0;
8437 			break;
8438 		}
8439 		ref_scroll_down(view, 1);
8440 		break;
8441 	case CTRL('d'):
8442 	case 'd':
8443 		nscroll /= 2;
8444 		/* FALL THROUGH */
8445 	case KEY_NPAGE:
8446 	case CTRL('f'):
8447 	case 'f':
8448 	case ' ':
8449 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8450 			/* can't scroll any further; move cursor down */
8451 			if (s->selected < s->ndisplayed - 1)
8452 				s->selected += MIN(nscroll,
8453 				    s->ndisplayed - s->selected - 1);
8454 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8455 				s->selected += s->ndisplayed - s->selected - 1;
8456 			view->count = 0;
8457 			break;
8458 		}
8459 		ref_scroll_down(view, nscroll);
8460 		break;
8461 	case CTRL('l'):
8462 		view->count = 0;
8463 		tog_free_refs();
8464 		err = tog_load_refs(s->repo, s->sort_by_date);
8465 		if (err)
8466 			break;
8467 		ref_view_free_refs(s);
8468 		err = ref_view_load_refs(s);
8469 		break;
8470 	case KEY_RESIZE:
8471 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8472 			s->selected = view->nlines - 2;
8473 		break;
8474 	default:
8475 		view->count = 0;
8476 		break;
8477 	}
8478 
8479 	return err;
8480 }
8481 
8482 __dead static void
8483 usage_ref(void)
8484 {
8485 	endwin();
8486 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8487 	    getprogname());
8488 	exit(1);
8489 }
8490 
8491 static const struct got_error *
8492 cmd_ref(int argc, char *argv[])
8493 {
8494 	const struct got_error *error;
8495 	struct got_repository *repo = NULL;
8496 	struct got_worktree *worktree = NULL;
8497 	char *cwd = NULL, *repo_path = NULL;
8498 	int ch;
8499 	struct tog_view *view;
8500 	int *pack_fds = NULL;
8501 
8502 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8503 		switch (ch) {
8504 		case 'r':
8505 			repo_path = realpath(optarg, NULL);
8506 			if (repo_path == NULL)
8507 				return got_error_from_errno2("realpath",
8508 				    optarg);
8509 			break;
8510 		default:
8511 			usage_ref();
8512 			/* NOTREACHED */
8513 		}
8514 	}
8515 
8516 	argc -= optind;
8517 	argv += optind;
8518 
8519 	if (argc > 1)
8520 		usage_ref();
8521 
8522 	error = got_repo_pack_fds_open(&pack_fds);
8523 	if (error != NULL)
8524 		goto done;
8525 
8526 	if (repo_path == NULL) {
8527 		cwd = getcwd(NULL, 0);
8528 		if (cwd == NULL)
8529 			return got_error_from_errno("getcwd");
8530 		error = got_worktree_open(&worktree, cwd);
8531 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8532 			goto done;
8533 		if (worktree)
8534 			repo_path =
8535 			    strdup(got_worktree_get_repo_path(worktree));
8536 		else
8537 			repo_path = strdup(cwd);
8538 		if (repo_path == NULL) {
8539 			error = got_error_from_errno("strdup");
8540 			goto done;
8541 		}
8542 	}
8543 
8544 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8545 	if (error != NULL)
8546 		goto done;
8547 
8548 	init_curses();
8549 
8550 	error = apply_unveil(got_repo_get_path(repo), NULL);
8551 	if (error)
8552 		goto done;
8553 
8554 	error = tog_load_refs(repo, 0);
8555 	if (error)
8556 		goto done;
8557 
8558 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8559 	if (view == NULL) {
8560 		error = got_error_from_errno("view_open");
8561 		goto done;
8562 	}
8563 
8564 	error = open_ref_view(view, repo);
8565 	if (error)
8566 		goto done;
8567 
8568 	if (worktree) {
8569 		/* Release work tree lock. */
8570 		got_worktree_close(worktree);
8571 		worktree = NULL;
8572 	}
8573 	error = view_loop(view);
8574 done:
8575 	free(repo_path);
8576 	free(cwd);
8577 	if (repo) {
8578 		const struct got_error *close_err = got_repo_close(repo);
8579 		if (close_err)
8580 			error = close_err;
8581 	}
8582 	if (pack_fds) {
8583 		const struct got_error *pack_err =
8584 		    got_repo_pack_fds_close(pack_fds);
8585 		if (error == NULL)
8586 			error = pack_err;
8587 	}
8588 	tog_free_refs();
8589 	return error;
8590 }
8591 
8592 static const struct got_error*
8593 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8594     const char *str)
8595 {
8596 	size_t len;
8597 
8598 	if (win == NULL)
8599 		win = stdscr;
8600 
8601 	len = strlen(str);
8602 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8603 
8604 	if (focus)
8605 		wstandout(win);
8606 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8607 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8608 	if (focus)
8609 		wstandend(win);
8610 
8611 	return NULL;
8612 }
8613 
8614 static const struct got_error *
8615 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8616 {
8617 	off_t *p;
8618 
8619 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8620 	if (p == NULL) {
8621 		free(*line_offsets);
8622 		*line_offsets = NULL;
8623 		return got_error_from_errno("reallocarray");
8624 	}
8625 
8626 	*line_offsets = p;
8627 	(*line_offsets)[*nlines] = off;
8628 	++(*nlines);
8629 	return NULL;
8630 }
8631 
8632 static const struct got_error *
8633 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8634 {
8635 	*ret = 0;
8636 
8637 	for (;n > 0; --n, ++km) {
8638 		char	*t0, *t, *k;
8639 		size_t	 len = 1;
8640 
8641 		if (km->keys == NULL)
8642 			continue;
8643 
8644 		t = t0 = strdup(km->keys);
8645 		if (t0 == NULL)
8646 			return got_error_from_errno("strdup");
8647 
8648 		len += strlen(t);
8649 		while ((k = strsep(&t, " ")) != NULL)
8650 			len += strlen(k) > 1 ? 2 : 0;
8651 		free(t0);
8652 		*ret = MAX(*ret, len);
8653 	}
8654 
8655 	return NULL;
8656 }
8657 
8658 /*
8659  * Write keymap section headers, keys, and key info in km to f.
8660  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8661  * wrap control and symbolic keys in guillemets, else use <>.
8662  */
8663 static const struct got_error *
8664 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8665 {
8666 	int n, len = width;
8667 
8668 	if (km->keys) {
8669 		static const char *u8_glyph[] = {
8670 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8671 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8672 		};
8673 		char	*t0, *t, *k;
8674 		int	 cs, s, first = 1;
8675 
8676 		cs = got_locale_is_utf8();
8677 
8678 		t = t0 = strdup(km->keys);
8679 		if (t0 == NULL)
8680 			return got_error_from_errno("strdup");
8681 
8682 		len = strlen(km->keys);
8683 		while ((k = strsep(&t, " ")) != NULL) {
8684 			s = strlen(k) > 1;  /* control or symbolic key */
8685 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8686 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8687 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8688 			if (n < 0) {
8689 				free(t0);
8690 				return got_error_from_errno("fprintf");
8691 			}
8692 			first = 0;
8693 			len += s ? 2 : 0;
8694 			*off += n;
8695 		}
8696 		free(t0);
8697 	}
8698 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8699 	if (n < 0)
8700 		return got_error_from_errno("fprintf");
8701 	*off += n;
8702 
8703 	return NULL;
8704 }
8705 
8706 static const struct got_error *
8707 format_help(struct tog_help_view_state *s)
8708 {
8709 	const struct got_error		*err = NULL;
8710 	off_t				 off = 0;
8711 	int				 i, max, n, show = s->all;
8712 	static const struct tog_key_map	 km[] = {
8713 #define KEYMAP_(info, type)	{ NULL, (info), type }
8714 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8715 		GENERATE_HELP
8716 #undef KEYMAP_
8717 #undef KEY_
8718 	};
8719 
8720 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8721 	if (err)
8722 		return err;
8723 
8724 	n = nitems(km);
8725 	err = max_key_str(&max, km, n);
8726 	if (err)
8727 		return err;
8728 
8729 	for (i = 0; i < n; ++i) {
8730 		if (km[i].keys == NULL) {
8731 			show = s->all;
8732 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8733 			    km[i].type == s->type || s->all)
8734 				show = 1;
8735 		}
8736 		if (show) {
8737 			err = format_help_line(&off, s->f, &km[i], max);
8738 			if (err)
8739 				return err;
8740 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8741 			if (err)
8742 				return err;
8743 		}
8744 	}
8745 	fputc('\n', s->f);
8746 	++off;
8747 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8748 	return err;
8749 }
8750 
8751 static const struct got_error *
8752 create_help(struct tog_help_view_state *s)
8753 {
8754 	FILE			*f;
8755 	const struct got_error	*err;
8756 
8757 	free(s->line_offsets);
8758 	s->line_offsets = NULL;
8759 	s->nlines = 0;
8760 
8761 	f = got_opentemp();
8762 	if (f == NULL)
8763 		return got_error_from_errno("got_opentemp");
8764 	s->f = f;
8765 
8766 	err = format_help(s);
8767 	if (err)
8768 		return err;
8769 
8770 	if (s->f && fflush(s->f) != 0)
8771 		return got_error_from_errno("fflush");
8772 
8773 	return NULL;
8774 }
8775 
8776 static const struct got_error *
8777 search_start_help_view(struct tog_view *view)
8778 {
8779 	view->state.help.matched_line = 0;
8780 	return NULL;
8781 }
8782 
8783 static void
8784 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8785     size_t *nlines, int **first, int **last, int **match, int **selected)
8786 {
8787 	struct tog_help_view_state *s = &view->state.help;
8788 
8789 	*f = s->f;
8790 	*nlines = s->nlines;
8791 	*line_offsets = s->line_offsets;
8792 	*match = &s->matched_line;
8793 	*first = &s->first_displayed_line;
8794 	*last = &s->last_displayed_line;
8795 	*selected = &s->selected_line;
8796 }
8797 
8798 static const struct got_error *
8799 show_help_view(struct tog_view *view)
8800 {
8801 	struct tog_help_view_state	*s = &view->state.help;
8802 	const struct got_error		*err;
8803 	regmatch_t			*regmatch = &view->regmatch;
8804 	wchar_t				*wline;
8805 	char				*line;
8806 	ssize_t				 linelen;
8807 	size_t				 linesz = 0;
8808 	int				 width, nprinted = 0, rc = 0;
8809 	int				 eos = view->nlines;
8810 
8811 	if (view_is_hsplit_top(view))
8812 		--eos;  /* account for border */
8813 
8814 	s->lineno = 0;
8815 	rewind(s->f);
8816 	werase(view->window);
8817 
8818 	if (view->gline > s->nlines - 1)
8819 		view->gline = s->nlines - 1;
8820 
8821 	err = win_draw_center(view->window, 0, 0, view->ncols,
8822 	    view_needs_focus_indication(view),
8823 	    "tog help (press q to return to tog)");
8824 	if (err)
8825 		return err;
8826 	if (eos <= 1)
8827 		return NULL;
8828 	waddstr(view->window, "\n\n");
8829 	eos -= 2;
8830 
8831 	s->eof = 0;
8832 	view->maxx = 0;
8833 	line = NULL;
8834 	while (eos > 0 && nprinted < eos) {
8835 		attr_t attr = 0;
8836 
8837 		linelen = getline(&line, &linesz, s->f);
8838 		if (linelen == -1) {
8839 			if (!feof(s->f)) {
8840 				free(line);
8841 				return got_ferror(s->f, GOT_ERR_IO);
8842 			}
8843 			s->eof = 1;
8844 			break;
8845 		}
8846 		if (++s->lineno < s->first_displayed_line)
8847 			continue;
8848 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8849 			continue;
8850 		if (s->lineno == view->hiline)
8851 			attr = A_STANDOUT;
8852 
8853 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8854 		    view->x ? 1 : 0);
8855 		if (err) {
8856 			free(line);
8857 			return err;
8858 		}
8859 		view->maxx = MAX(view->maxx, width);
8860 		free(wline);
8861 		wline = NULL;
8862 
8863 		if (attr)
8864 			wattron(view->window, attr);
8865 		if (s->first_displayed_line + nprinted == s->matched_line &&
8866 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8867 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8868 			    view->window, view->x, regmatch);
8869 			if (err) {
8870 				free(line);
8871 				return err;
8872 			}
8873 		} else {
8874 			int skip;
8875 
8876 			err = format_line(&wline, &width, &skip, line,
8877 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8878 			if (err) {
8879 				free(line);
8880 				return err;
8881 			}
8882 			waddwstr(view->window, &wline[skip]);
8883 			free(wline);
8884 			wline = NULL;
8885 		}
8886 		if (s->lineno == view->hiline) {
8887 			while (width++ < view->ncols)
8888 				waddch(view->window, ' ');
8889 		} else {
8890 			if (width < view->ncols)
8891 				waddch(view->window, '\n');
8892 		}
8893 		if (attr)
8894 			wattroff(view->window, attr);
8895 		if (++nprinted == 1)
8896 			s->first_displayed_line = s->lineno;
8897 	}
8898 	free(line);
8899 	if (nprinted > 0)
8900 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8901 	else
8902 		s->last_displayed_line = s->first_displayed_line;
8903 
8904 	view_border(view);
8905 
8906 	if (s->eof) {
8907 		rc = waddnstr(view->window,
8908 		    "See the tog(1) manual page for full documentation",
8909 		    view->ncols - 1);
8910 		if (rc == ERR)
8911 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8912 	} else {
8913 		wmove(view->window, view->nlines - 1, 0);
8914 		wclrtoeol(view->window);
8915 		wstandout(view->window);
8916 		rc = waddnstr(view->window, "scroll down for more...",
8917 		    view->ncols - 1);
8918 		if (rc == ERR)
8919 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8920 		if (getcurx(view->window) < view->ncols - 6) {
8921 			rc = wprintw(view->window, "[%.0f%%]",
8922 			    100.00 * s->last_displayed_line / s->nlines);
8923 			if (rc == ERR)
8924 				return got_error_msg(GOT_ERR_IO, "wprintw");
8925 		}
8926 		wstandend(view->window);
8927 	}
8928 
8929 	return NULL;
8930 }
8931 
8932 static const struct got_error *
8933 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8934 {
8935 	struct tog_help_view_state	*s = &view->state.help;
8936 	const struct got_error		*err = NULL;
8937 	char				*line = NULL;
8938 	ssize_t				 linelen;
8939 	size_t				 linesz = 0;
8940 	int				 eos, nscroll;
8941 
8942 	eos = nscroll = view->nlines;
8943 	if (view_is_hsplit_top(view))
8944 		--eos;  /* border */
8945 
8946 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8947 
8948 	switch (ch) {
8949 	case '0':
8950 	case '$':
8951 	case KEY_RIGHT:
8952 	case 'l':
8953 	case KEY_LEFT:
8954 	case 'h':
8955 		horizontal_scroll_input(view, ch);
8956 		break;
8957 	case 'g':
8958 	case KEY_HOME:
8959 		s->first_displayed_line = 1;
8960 		view->count = 0;
8961 		break;
8962 	case 'G':
8963 	case KEY_END:
8964 		view->count = 0;
8965 		if (s->eof)
8966 			break;
8967 		s->first_displayed_line = (s->nlines - eos) + 3;
8968 		s->eof = 1;
8969 		break;
8970 	case 'k':
8971 	case KEY_UP:
8972 		if (s->first_displayed_line > 1)
8973 			--s->first_displayed_line;
8974 		else
8975 			view->count = 0;
8976 		break;
8977 	case CTRL('u'):
8978 	case 'u':
8979 		nscroll /= 2;
8980 		/* FALL THROUGH */
8981 	case KEY_PPAGE:
8982 	case CTRL('b'):
8983 	case 'b':
8984 		if (s->first_displayed_line == 1) {
8985 			view->count = 0;
8986 			break;
8987 		}
8988 		while (--nscroll > 0 && s->first_displayed_line > 1)
8989 			s->first_displayed_line--;
8990 		break;
8991 	case 'j':
8992 	case KEY_DOWN:
8993 	case CTRL('n'):
8994 		if (!s->eof)
8995 			++s->first_displayed_line;
8996 		else
8997 			view->count = 0;
8998 		break;
8999 	case CTRL('d'):
9000 	case 'd':
9001 		nscroll /= 2;
9002 		/* FALL THROUGH */
9003 	case KEY_NPAGE:
9004 	case CTRL('f'):
9005 	case 'f':
9006 	case ' ':
9007 		if (s->eof) {
9008 			view->count = 0;
9009 			break;
9010 		}
9011 		while (!s->eof && --nscroll > 0) {
9012 			linelen = getline(&line, &linesz, s->f);
9013 			s->first_displayed_line++;
9014 			if (linelen == -1) {
9015 				if (feof(s->f))
9016 					s->eof = 1;
9017 				else
9018 					err = got_ferror(s->f, GOT_ERR_IO);
9019 				break;
9020 			}
9021 		}
9022 		free(line);
9023 		break;
9024 	default:
9025 		view->count = 0;
9026 		break;
9027 	}
9028 
9029 	return err;
9030 }
9031 
9032 static const struct got_error *
9033 close_help_view(struct tog_view *view)
9034 {
9035 	struct tog_help_view_state *s = &view->state.help;
9036 
9037 	free(s->line_offsets);
9038 	s->line_offsets = NULL;
9039 	if (fclose(s->f) == EOF)
9040 		return got_error_from_errno("fclose");
9041 
9042 	return NULL;
9043 }
9044 
9045 static const struct got_error *
9046 reset_help_view(struct tog_view *view)
9047 {
9048 	struct tog_help_view_state *s = &view->state.help;
9049 
9050 
9051 	if (s->f && fclose(s->f) == EOF)
9052 		return got_error_from_errno("fclose");
9053 
9054 	wclear(view->window);
9055 	view->count = 0;
9056 	view->x = 0;
9057 	s->all = !s->all;
9058 	s->first_displayed_line = 1;
9059 	s->last_displayed_line = view->nlines;
9060 	s->matched_line = 0;
9061 
9062 	return create_help(s);
9063 }
9064 
9065 static const struct got_error *
9066 open_help_view(struct tog_view *view, struct tog_view *parent)
9067 {
9068 	const struct got_error		*err = NULL;
9069 	struct tog_help_view_state	*s = &view->state.help;
9070 
9071 	s->type = (enum tog_keymap_type)parent->type;
9072 	s->first_displayed_line = 1;
9073 	s->last_displayed_line = view->nlines;
9074 	s->selected_line = 1;
9075 
9076 	view->show = show_help_view;
9077 	view->input = input_help_view;
9078 	view->reset = reset_help_view;
9079 	view->close = close_help_view;
9080 	view->search_start = search_start_help_view;
9081 	view->search_setup = search_setup_help_view;
9082 	view->search_next = search_next_view_match;
9083 
9084 	err = create_help(s);
9085 	return err;
9086 }
9087 
9088 static const struct got_error *
9089 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9090     enum tog_view_type request, int y, int x)
9091 {
9092 	const struct got_error *err = NULL;
9093 
9094 	*new_view = NULL;
9095 
9096 	switch (request) {
9097 	case TOG_VIEW_DIFF:
9098 		if (view->type == TOG_VIEW_LOG) {
9099 			struct tog_log_view_state *s = &view->state.log;
9100 
9101 			err = open_diff_view_for_commit(new_view, y, x,
9102 			    s->selected_entry->commit, s->selected_entry->id,
9103 			    view, s->repo);
9104 		} else
9105 			return got_error_msg(GOT_ERR_NOT_IMPL,
9106 			    "parent/child view pair not supported");
9107 		break;
9108 	case TOG_VIEW_BLAME:
9109 		if (view->type == TOG_VIEW_TREE) {
9110 			struct tog_tree_view_state *s = &view->state.tree;
9111 
9112 			err = blame_tree_entry(new_view, y, x,
9113 			    s->selected_entry, &s->parents, s->commit_id,
9114 			    s->repo);
9115 		} else
9116 			return got_error_msg(GOT_ERR_NOT_IMPL,
9117 			    "parent/child view pair not supported");
9118 		break;
9119 	case TOG_VIEW_LOG:
9120 		if (view->type == TOG_VIEW_BLAME)
9121 			err = log_annotated_line(new_view, y, x,
9122 			    view->state.blame.repo, view->state.blame.id_to_log);
9123 		else if (view->type == TOG_VIEW_TREE)
9124 			err = log_selected_tree_entry(new_view, y, x,
9125 			    &view->state.tree);
9126 		else if (view->type == TOG_VIEW_REF)
9127 			err = log_ref_entry(new_view, y, x,
9128 			    view->state.ref.selected_entry,
9129 			    view->state.ref.repo);
9130 		else
9131 			return got_error_msg(GOT_ERR_NOT_IMPL,
9132 			    "parent/child view pair not supported");
9133 		break;
9134 	case TOG_VIEW_TREE:
9135 		if (view->type == TOG_VIEW_LOG)
9136 			err = browse_commit_tree(new_view, y, x,
9137 			    view->state.log.selected_entry,
9138 			    view->state.log.in_repo_path,
9139 			    view->state.log.head_ref_name,
9140 			    view->state.log.repo);
9141 		else if (view->type == TOG_VIEW_REF)
9142 			err = browse_ref_tree(new_view, y, x,
9143 			    view->state.ref.selected_entry,
9144 			    view->state.ref.repo);
9145 		else
9146 			return got_error_msg(GOT_ERR_NOT_IMPL,
9147 			    "parent/child view pair not supported");
9148 		break;
9149 	case TOG_VIEW_REF:
9150 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9151 		if (*new_view == NULL)
9152 			return got_error_from_errno("view_open");
9153 		if (view->type == TOG_VIEW_LOG)
9154 			err = open_ref_view(*new_view, view->state.log.repo);
9155 		else if (view->type == TOG_VIEW_TREE)
9156 			err = open_ref_view(*new_view, view->state.tree.repo);
9157 		else
9158 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9159 			    "parent/child view pair not supported");
9160 		if (err)
9161 			view_close(*new_view);
9162 		break;
9163 	case TOG_VIEW_HELP:
9164 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9165 		if (*new_view == NULL)
9166 			return got_error_from_errno("view_open");
9167 		err = open_help_view(*new_view, view);
9168 		if (err)
9169 			view_close(*new_view);
9170 		break;
9171 	default:
9172 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9173 	}
9174 
9175 	return err;
9176 }
9177 
9178 /*
9179  * If view was scrolled down to move the selected line into view when opening a
9180  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9181  */
9182 static void
9183 offset_selection_up(struct tog_view *view)
9184 {
9185 	switch (view->type) {
9186 	case TOG_VIEW_BLAME: {
9187 		struct tog_blame_view_state *s = &view->state.blame;
9188 		if (s->first_displayed_line == 1) {
9189 			s->selected_line = MAX(s->selected_line - view->offset,
9190 			    1);
9191 			break;
9192 		}
9193 		if (s->first_displayed_line > view->offset)
9194 			s->first_displayed_line -= view->offset;
9195 		else
9196 			s->first_displayed_line = 1;
9197 		s->selected_line += view->offset;
9198 		break;
9199 	}
9200 	case TOG_VIEW_LOG:
9201 		log_scroll_up(&view->state.log, view->offset);
9202 		view->state.log.selected += view->offset;
9203 		break;
9204 	case TOG_VIEW_REF:
9205 		ref_scroll_up(&view->state.ref, view->offset);
9206 		view->state.ref.selected += view->offset;
9207 		break;
9208 	case TOG_VIEW_TREE:
9209 		tree_scroll_up(&view->state.tree, view->offset);
9210 		view->state.tree.selected += view->offset;
9211 		break;
9212 	default:
9213 		break;
9214 	}
9215 
9216 	view->offset = 0;
9217 }
9218 
9219 /*
9220  * If the selected line is in the section of screen covered by the bottom split,
9221  * scroll down offset lines to move it into view and index its new position.
9222  */
9223 static const struct got_error *
9224 offset_selection_down(struct tog_view *view)
9225 {
9226 	const struct got_error	*err = NULL;
9227 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9228 	int			*selected = NULL;
9229 	int			 header, offset;
9230 
9231 	switch (view->type) {
9232 	case TOG_VIEW_BLAME: {
9233 		struct tog_blame_view_state *s = &view->state.blame;
9234 		header = 3;
9235 		scrolld = NULL;
9236 		if (s->selected_line > view->nlines - header) {
9237 			offset = abs(view->nlines - s->selected_line - header);
9238 			s->first_displayed_line += offset;
9239 			s->selected_line -= offset;
9240 			view->offset = offset;
9241 		}
9242 		break;
9243 	}
9244 	case TOG_VIEW_LOG: {
9245 		struct tog_log_view_state *s = &view->state.log;
9246 		scrolld = &log_scroll_down;
9247 		header = view_is_parent_view(view) ? 3 : 2;
9248 		selected = &s->selected;
9249 		break;
9250 	}
9251 	case TOG_VIEW_REF: {
9252 		struct tog_ref_view_state *s = &view->state.ref;
9253 		scrolld = &ref_scroll_down;
9254 		header = 3;
9255 		selected = &s->selected;
9256 		break;
9257 	}
9258 	case TOG_VIEW_TREE: {
9259 		struct tog_tree_view_state *s = &view->state.tree;
9260 		scrolld = &tree_scroll_down;
9261 		header = 5;
9262 		selected = &s->selected;
9263 		break;
9264 	}
9265 	default:
9266 		selected = NULL;
9267 		scrolld = NULL;
9268 		header = 0;
9269 		break;
9270 	}
9271 
9272 	if (selected && *selected > view->nlines - header) {
9273 		offset = abs(view->nlines - *selected - header);
9274 		view->offset = offset;
9275 		if (scrolld && offset) {
9276 			err = scrolld(view, offset);
9277 			*selected -= offset;
9278 		}
9279 	}
9280 
9281 	return err;
9282 }
9283 
9284 static void
9285 list_commands(FILE *fp)
9286 {
9287 	size_t i;
9288 
9289 	fprintf(fp, "commands:");
9290 	for (i = 0; i < nitems(tog_commands); i++) {
9291 		const struct tog_cmd *cmd = &tog_commands[i];
9292 		fprintf(fp, " %s", cmd->name);
9293 	}
9294 	fputc('\n', fp);
9295 }
9296 
9297 __dead static void
9298 usage(int hflag, int status)
9299 {
9300 	FILE *fp = (status == 0) ? stdout : stderr;
9301 
9302 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9303 	    getprogname());
9304 	if (hflag) {
9305 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9306 		list_commands(fp);
9307 	}
9308 	exit(status);
9309 }
9310 
9311 static char **
9312 make_argv(int argc, ...)
9313 {
9314 	va_list ap;
9315 	char **argv;
9316 	int i;
9317 
9318 	va_start(ap, argc);
9319 
9320 	argv = calloc(argc, sizeof(char *));
9321 	if (argv == NULL)
9322 		err(1, "calloc");
9323 	for (i = 0; i < argc; i++) {
9324 		argv[i] = strdup(va_arg(ap, char *));
9325 		if (argv[i] == NULL)
9326 			err(1, "strdup");
9327 	}
9328 
9329 	va_end(ap);
9330 	return argv;
9331 }
9332 
9333 /*
9334  * Try to convert 'tog path' into a 'tog log path' command.
9335  * The user could simply have mistyped the command rather than knowingly
9336  * provided a path. So check whether argv[0] can in fact be resolved
9337  * to a path in the HEAD commit and print a special error if not.
9338  * This hack is for mpi@ <3
9339  */
9340 static const struct got_error *
9341 tog_log_with_path(int argc, char *argv[])
9342 {
9343 	const struct got_error *error = NULL, *close_err;
9344 	const struct tog_cmd *cmd = NULL;
9345 	struct got_repository *repo = NULL;
9346 	struct got_worktree *worktree = NULL;
9347 	struct got_object_id *commit_id = NULL, *id = NULL;
9348 	struct got_commit_object *commit = NULL;
9349 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9350 	char *commit_id_str = NULL, **cmd_argv = NULL;
9351 	int *pack_fds = NULL;
9352 
9353 	cwd = getcwd(NULL, 0);
9354 	if (cwd == NULL)
9355 		return got_error_from_errno("getcwd");
9356 
9357 	error = got_repo_pack_fds_open(&pack_fds);
9358 	if (error != NULL)
9359 		goto done;
9360 
9361 	error = got_worktree_open(&worktree, cwd);
9362 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9363 		goto done;
9364 
9365 	if (worktree)
9366 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9367 	else
9368 		repo_path = strdup(cwd);
9369 	if (repo_path == NULL) {
9370 		error = got_error_from_errno("strdup");
9371 		goto done;
9372 	}
9373 
9374 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9375 	if (error != NULL)
9376 		goto done;
9377 
9378 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9379 	    repo, worktree);
9380 	if (error)
9381 		goto done;
9382 
9383 	error = tog_load_refs(repo, 0);
9384 	if (error)
9385 		goto done;
9386 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9387 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9388 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9389 	if (error)
9390 		goto done;
9391 
9392 	if (worktree) {
9393 		got_worktree_close(worktree);
9394 		worktree = NULL;
9395 	}
9396 
9397 	error = got_object_open_as_commit(&commit, repo, commit_id);
9398 	if (error)
9399 		goto done;
9400 
9401 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9402 	if (error) {
9403 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9404 			goto done;
9405 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9406 		    getprogname(), argv[0]);
9407 		usage(1, 1);
9408 		/* not reached */
9409 	}
9410 
9411 	error = got_object_id_str(&commit_id_str, commit_id);
9412 	if (error)
9413 		goto done;
9414 
9415 	cmd = &tog_commands[0]; /* log */
9416 	argc = 4;
9417 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9418 	error = cmd->cmd_main(argc, cmd_argv);
9419 done:
9420 	if (repo) {
9421 		close_err = got_repo_close(repo);
9422 		if (error == NULL)
9423 			error = close_err;
9424 	}
9425 	if (commit)
9426 		got_object_commit_close(commit);
9427 	if (worktree)
9428 		got_worktree_close(worktree);
9429 	if (pack_fds) {
9430 		const struct got_error *pack_err =
9431 		    got_repo_pack_fds_close(pack_fds);
9432 		if (error == NULL)
9433 			error = pack_err;
9434 	}
9435 	free(id);
9436 	free(commit_id_str);
9437 	free(commit_id);
9438 	free(cwd);
9439 	free(repo_path);
9440 	free(in_repo_path);
9441 	if (cmd_argv) {
9442 		int i;
9443 		for (i = 0; i < argc; i++)
9444 			free(cmd_argv[i]);
9445 		free(cmd_argv);
9446 	}
9447 	tog_free_refs();
9448 	return error;
9449 }
9450 
9451 int
9452 main(int argc, char *argv[])
9453 {
9454 	const struct got_error *error = NULL;
9455 	const struct tog_cmd *cmd = NULL;
9456 	int ch, hflag = 0, Vflag = 0;
9457 	char **cmd_argv = NULL;
9458 	static const struct option longopts[] = {
9459 	    { "version", no_argument, NULL, 'V' },
9460 	    { NULL, 0, NULL, 0}
9461 	};
9462 	char *diff_algo_str = NULL;
9463 
9464 	setlocale(LC_CTYPE, "");
9465 
9466 #ifndef PROFILE
9467 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9468 	    NULL) == -1)
9469 		err(1, "pledge");
9470 #endif
9471 
9472 	if (!isatty(STDIN_FILENO))
9473 		errx(1, "standard input is not a tty");
9474 
9475 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9476 		switch (ch) {
9477 		case 'h':
9478 			hflag = 1;
9479 			break;
9480 		case 'V':
9481 			Vflag = 1;
9482 			break;
9483 		default:
9484 			usage(hflag, 1);
9485 			/* NOTREACHED */
9486 		}
9487 	}
9488 
9489 	argc -= optind;
9490 	argv += optind;
9491 	optind = 1;
9492 	optreset = 1;
9493 
9494 	if (Vflag) {
9495 		got_version_print_str();
9496 		return 0;
9497 	}
9498 
9499 	if (argc == 0) {
9500 		if (hflag)
9501 			usage(hflag, 0);
9502 		/* Build an argument vector which runs a default command. */
9503 		cmd = &tog_commands[0];
9504 		argc = 1;
9505 		cmd_argv = make_argv(argc, cmd->name);
9506 	} else {
9507 		size_t i;
9508 
9509 		/* Did the user specify a command? */
9510 		for (i = 0; i < nitems(tog_commands); i++) {
9511 			if (strncmp(tog_commands[i].name, argv[0],
9512 			    strlen(argv[0])) == 0) {
9513 				cmd = &tog_commands[i];
9514 				break;
9515 			}
9516 		}
9517 	}
9518 
9519 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9520 	if (diff_algo_str) {
9521 		if (strcasecmp(diff_algo_str, "patience") == 0)
9522 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9523 		if (strcasecmp(diff_algo_str, "myers") == 0)
9524 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9525 	}
9526 
9527 	if (cmd == NULL) {
9528 		if (argc != 1)
9529 			usage(0, 1);
9530 		/* No command specified; try log with a path */
9531 		error = tog_log_with_path(argc, argv);
9532 	} else {
9533 		if (hflag)
9534 			cmd->cmd_usage();
9535 		else
9536 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9537 	}
9538 
9539 	endwin();
9540 	if (cmd_argv) {
9541 		int i;
9542 		for (i = 0; i < argc; i++)
9543 			free(cmd_argv[i]);
9544 		free(cmd_argv);
9545 	}
9546 
9547 	if (error && error->code != GOT_ERR_CANCELLED &&
9548 	    error->code != GOT_ERR_EOF &&
9549 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9550 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9551 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9552 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9553 	return 0;
9554 }