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 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static struct {
155 	struct got_object_id	*id;
156 	int			 idx;
157 	char			 marker;
158 } tog_base_commit;
159 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
160 
161 static const struct got_error *
162 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
163     struct got_reference* re2)
164 {
165 	const char *name1 = got_ref_get_name(re1);
166 	const char *name2 = got_ref_get_name(re2);
167 	int isbackup1, isbackup2;
168 
169 	/* Sort backup refs towards the bottom of the list. */
170 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
171 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
172 	if (!isbackup1 && isbackup2) {
173 		*cmp = -1;
174 		return NULL;
175 	} else if (isbackup1 && !isbackup2) {
176 		*cmp = 1;
177 		return NULL;
178 	}
179 
180 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 tog_load_refs(struct got_repository *repo, int sort_by_date)
186 {
187 	const struct got_error *err;
188 
189 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
190 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
191 	    repo);
192 	if (err)
193 		return err;
194 
195 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
196 	    repo);
197 }
198 
199 static void
200 tog_free_refs(void)
201 {
202 	if (tog_refs_idmap) {
203 		got_reflist_object_id_map_free(tog_refs_idmap);
204 		tog_refs_idmap = NULL;
205 	}
206 	got_ref_list_free(&tog_refs);
207 }
208 
209 static const struct got_error *
210 add_color(struct tog_colors *colors, const char *pattern,
211     int idx, short color)
212 {
213 	const struct got_error *err = NULL;
214 	struct tog_color *tc;
215 	int regerr = 0;
216 
217 	if (idx < 1 || idx > COLOR_PAIRS - 1)
218 		return NULL;
219 
220 	init_pair(idx, color, -1);
221 
222 	tc = calloc(1, sizeof(*tc));
223 	if (tc == NULL)
224 		return got_error_from_errno("calloc");
225 	regerr = regcomp(&tc->regex, pattern,
226 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
227 	if (regerr) {
228 		static char regerr_msg[512];
229 		static char err_msg[512];
230 		regerror(regerr, &tc->regex, regerr_msg,
231 		    sizeof(regerr_msg));
232 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
233 		    regerr_msg);
234 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
235 		free(tc);
236 		return err;
237 	}
238 	tc->colorpair = idx;
239 	STAILQ_INSERT_HEAD(colors, tc, entry);
240 	return NULL;
241 }
242 
243 static void
244 free_colors(struct tog_colors *colors)
245 {
246 	struct tog_color *tc;
247 
248 	while (!STAILQ_EMPTY(colors)) {
249 		tc = STAILQ_FIRST(colors);
250 		STAILQ_REMOVE_HEAD(colors, entry);
251 		regfree(&tc->regex);
252 		free(tc);
253 	}
254 }
255 
256 static struct tog_color *
257 get_color(struct tog_colors *colors, int colorpair)
258 {
259 	struct tog_color *tc = NULL;
260 
261 	STAILQ_FOREACH(tc, colors, entry) {
262 		if (tc->colorpair == colorpair)
263 			return tc;
264 	}
265 
266 	return NULL;
267 }
268 
269 static int
270 default_color_value(const char *envvar)
271 {
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
273 		return COLOR_MAGENTA;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
283 		return COLOR_MAGENTA;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
291 		return COLOR_CYAN;
292 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
295 		return COLOR_GREEN;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
297 		return COLOR_MAGENTA;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
299 		return COLOR_YELLOW;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
301 		return COLOR_CYAN;
302 
303 	return -1;
304 }
305 
306 static int
307 get_color_value(const char *envvar)
308 {
309 	const char *val = getenv(envvar);
310 
311 	if (val == NULL)
312 		return default_color_value(envvar);
313 
314 	if (strcasecmp(val, "black") == 0)
315 		return COLOR_BLACK;
316 	if (strcasecmp(val, "red") == 0)
317 		return COLOR_RED;
318 	if (strcasecmp(val, "green") == 0)
319 		return COLOR_GREEN;
320 	if (strcasecmp(val, "yellow") == 0)
321 		return COLOR_YELLOW;
322 	if (strcasecmp(val, "blue") == 0)
323 		return COLOR_BLUE;
324 	if (strcasecmp(val, "magenta") == 0)
325 		return COLOR_MAGENTA;
326 	if (strcasecmp(val, "cyan") == 0)
327 		return COLOR_CYAN;
328 	if (strcasecmp(val, "white") == 0)
329 		return COLOR_WHITE;
330 	if (strcasecmp(val, "default") == 0)
331 		return -1;
332 
333 	return default_color_value(envvar);
334 }
335 
336 struct tog_diff_view_state {
337 	struct got_object_id *id1, *id2;
338 	const char *label1, *label2;
339 	FILE *f, *f1, *f2;
340 	int fd1, fd2;
341 	int lineno;
342 	int first_displayed_line;
343 	int last_displayed_line;
344 	int eof;
345 	int diff_context;
346 	int ignore_whitespace;
347 	int force_text_diff;
348 	struct got_repository *repo;
349 	struct got_diff_line *lines;
350 	size_t nlines;
351 	int matched_line;
352 	int selected_line;
353 
354 	/* passed from log or blame view; may be NULL */
355 	struct tog_view *parent_view;
356 };
357 
358 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
359 static volatile sig_atomic_t tog_thread_error;
360 
361 struct tog_log_thread_args {
362 	pthread_cond_t need_commits;
363 	pthread_cond_t commit_loaded;
364 	int commits_needed;
365 	int load_all;
366 	struct got_commit_graph *graph;
367 	struct commit_queue *real_commits;
368 	const char *in_repo_path;
369 	struct got_object_id *start_id;
370 	struct got_repository *repo;
371 	int *pack_fds;
372 	int log_complete;
373 	pthread_cond_t log_loaded;
374 	sig_atomic_t *quit;
375 	struct commit_queue_entry **first_displayed_entry;
376 	struct commit_queue_entry **selected_entry;
377 	int *searching;
378 	int *search_next_done;
379 	regex_t *regex;
380 	int *limiting;
381 	int limit_match;
382 	regex_t *limit_regex;
383 	struct commit_queue *limit_commits;
384 	struct got_worktree *worktree;
385 	int need_commit_marker;
386 };
387 
388 struct tog_log_view_state {
389 	struct commit_queue *commits;
390 	struct commit_queue_entry *first_displayed_entry;
391 	struct commit_queue_entry *last_displayed_entry;
392 	struct commit_queue_entry *selected_entry;
393 	struct commit_queue real_commits;
394 	int selected;
395 	char *in_repo_path;
396 	char *head_ref_name;
397 	int log_branches;
398 	struct got_repository *repo;
399 	struct got_object_id *start_id;
400 	sig_atomic_t quit;
401 	pthread_t thread;
402 	struct tog_log_thread_args thread_args;
403 	struct commit_queue_entry *matched_entry;
404 	struct commit_queue_entry *search_entry;
405 	struct tog_colors colors;
406 	int use_committer;
407 	int limit_view;
408 	regex_t limit_regex;
409 	struct commit_queue limit_commits;
410 };
411 
412 #define TOG_COLOR_DIFF_MINUS		1
413 #define TOG_COLOR_DIFF_PLUS		2
414 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
415 #define TOG_COLOR_DIFF_META		4
416 #define TOG_COLOR_TREE_SUBMODULE	5
417 #define TOG_COLOR_TREE_SYMLINK		6
418 #define TOG_COLOR_TREE_DIRECTORY	7
419 #define TOG_COLOR_TREE_EXECUTABLE	8
420 #define TOG_COLOR_COMMIT		9
421 #define TOG_COLOR_AUTHOR		10
422 #define TOG_COLOR_DATE			11
423 #define TOG_COLOR_REFS_HEADS		12
424 #define TOG_COLOR_REFS_TAGS		13
425 #define TOG_COLOR_REFS_REMOTES		14
426 #define TOG_COLOR_REFS_BACKUP		15
427 
428 struct tog_blame_cb_args {
429 	struct tog_blame_line *lines; /* one per line */
430 	int nlines;
431 
432 	struct tog_view *view;
433 	struct got_object_id *commit_id;
434 	int *quit;
435 };
436 
437 struct tog_blame_thread_args {
438 	const char *path;
439 	struct got_repository *repo;
440 	struct tog_blame_cb_args *cb_args;
441 	int *complete;
442 	got_cancel_cb cancel_cb;
443 	void *cancel_arg;
444 	pthread_cond_t blame_complete;
445 };
446 
447 struct tog_blame {
448 	FILE *f;
449 	off_t filesize;
450 	struct tog_blame_line *lines;
451 	int nlines;
452 	off_t *line_offsets;
453 	pthread_t thread;
454 	struct tog_blame_thread_args thread_args;
455 	struct tog_blame_cb_args cb_args;
456 	const char *path;
457 	int *pack_fds;
458 };
459 
460 struct tog_blame_view_state {
461 	int first_displayed_line;
462 	int last_displayed_line;
463 	int selected_line;
464 	int last_diffed_line;
465 	int blame_complete;
466 	int eof;
467 	int done;
468 	struct got_object_id_queue blamed_commits;
469 	struct got_object_qid *blamed_commit;
470 	char *path;
471 	struct got_repository *repo;
472 	struct got_object_id *commit_id;
473 	struct got_object_id *id_to_log;
474 	struct tog_blame blame;
475 	int matched_line;
476 	struct tog_colors colors;
477 };
478 
479 struct tog_parent_tree {
480 	TAILQ_ENTRY(tog_parent_tree) entry;
481 	struct got_tree_object *tree;
482 	struct got_tree_entry *first_displayed_entry;
483 	struct got_tree_entry *selected_entry;
484 	int selected;
485 };
486 
487 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
488 
489 struct tog_tree_view_state {
490 	char *tree_label;
491 	struct got_object_id *commit_id;/* commit which this tree belongs to */
492 	struct got_tree_object *root;	/* the commit's root tree entry */
493 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
494 	struct got_tree_entry *first_displayed_entry;
495 	struct got_tree_entry *last_displayed_entry;
496 	struct got_tree_entry *selected_entry;
497 	int ndisplayed, selected, show_ids;
498 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
499 	char *head_ref_name;
500 	struct got_repository *repo;
501 	struct got_tree_entry *matched_entry;
502 	struct tog_colors colors;
503 };
504 
505 struct tog_reflist_entry {
506 	TAILQ_ENTRY(tog_reflist_entry) entry;
507 	struct got_reference *ref;
508 	int idx;
509 };
510 
511 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
512 
513 struct tog_ref_view_state {
514 	struct tog_reflist_head refs;
515 	struct tog_reflist_entry *first_displayed_entry;
516 	struct tog_reflist_entry *last_displayed_entry;
517 	struct tog_reflist_entry *selected_entry;
518 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
519 	struct got_repository *repo;
520 	struct tog_reflist_entry *matched_entry;
521 	struct tog_colors colors;
522 };
523 
524 struct tog_help_view_state {
525 	FILE			*f;
526 	off_t			*line_offsets;
527 	size_t			 nlines;
528 	int			 lineno;
529 	int			 first_displayed_line;
530 	int			 last_displayed_line;
531 	int			 eof;
532 	int			 matched_line;
533 	int			 selected_line;
534 	int			 all;
535 	enum tog_keymap_type	 type;
536 };
537 
538 #define GENERATE_HELP \
539 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
540 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
541 	KEY_("k C-p Up", "Move cursor or page up one line"), \
542 	KEY_("j C-n Down", "Move cursor or page down one line"), \
543 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
544 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
545 	KEY_("C-u u", "Scroll the view up one half page"), \
546 	KEY_("C-d d", "Scroll the view down one half page"), \
547 	KEY_("g", "Go to line N (default: first line)"), \
548 	KEY_("Home =", "Go to the first line"), \
549 	KEY_("G", "Go to line N (default: last line)"), \
550 	KEY_("End *", "Go to the last line"), \
551 	KEY_("l Right", "Scroll the view right"), \
552 	KEY_("h Left", "Scroll the view left"), \
553 	KEY_("$", "Scroll view to the rightmost position"), \
554 	KEY_("0", "Scroll view to the leftmost position"), \
555 	KEY_("-", "Decrease size of the focussed split"), \
556 	KEY_("+", "Increase size of the focussed split"), \
557 	KEY_("Tab", "Switch focus between views"), \
558 	KEY_("F", "Toggle fullscreen mode"), \
559 	KEY_("S", "Switch split-screen layout"), \
560 	KEY_("/", "Open prompt to enter search term"), \
561 	KEY_("n", "Find next line/token matching the current search term"), \
562 	KEY_("N", "Find previous line/token matching the current search term"),\
563 	KEY_("q", "Quit the focussed view; Quit help screen"), \
564 	KEY_("Q", "Quit tog"), \
565 	\
566 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
567 	KEY_("< ,", "Move cursor up one commit"), \
568 	KEY_("> .", "Move cursor down one commit"), \
569 	KEY_("Enter", "Open diff view of the selected commit"), \
570 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
571 	KEY_("R", "Open ref view of all repository references"), \
572 	KEY_("T", "Display tree view of the repository from the selected" \
573 	    " commit"), \
574 	KEY_("@", "Toggle between displaying author and committer name"), \
575 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
576 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
577 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
578 	\
579 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
580 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
581 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
582 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
583 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
584 	    " data"), \
585 	KEY_("(", "Go to the previous file in the diff"), \
586 	KEY_(")", "Go to the next file in the diff"), \
587 	KEY_("{", "Go to the previous hunk in the diff"), \
588 	KEY_("}", "Go to the next hunk in the diff"), \
589 	KEY_("[", "Decrease the number of context lines"), \
590 	KEY_("]", "Increase the number of context lines"), \
591 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
592 	\
593 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
594 	KEY_("Enter", "Display diff view of the selected line's commit"), \
595 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
596 	KEY_("L", "Open log view for the currently selected annotated line"), \
597 	KEY_("C", "Reload view with the previously blamed commit"), \
598 	KEY_("c", "Reload view with the version of the file found in the" \
599 	    " selected line's commit"), \
600 	KEY_("p", "Reload view with the version of the file found in the" \
601 	    " selected line's parent commit"), \
602 	\
603 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
604 	KEY_("Enter", "Enter selected directory or open blame view of the" \
605 	    " selected file"), \
606 	KEY_("L", "Open log view for the selected entry"), \
607 	KEY_("R", "Open ref view of all repository references"), \
608 	KEY_("i", "Show object IDs for all tree entries"), \
609 	KEY_("Backspace", "Return to the parent directory"), \
610 	\
611 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
612 	KEY_("Enter", "Display log view of the selected reference"), \
613 	KEY_("T", "Display tree view of the selected reference"), \
614 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
615 	KEY_("m", "Toggle display of last modified date for each reference"), \
616 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
617 	KEY_("C-l", "Reload view with all repository references")
618 
619 struct tog_key_map {
620 	const char		*keys;
621 	const char		*info;
622 	enum tog_keymap_type	 type;
623 };
624 
625 /* curses io for tog regress */
626 struct tog_io {
627 	FILE	*cin;
628 	FILE	*cout;
629 	FILE	*f;
630 	FILE	*sdump;
631 	char	*input_str;
632 	int	 wait_for_ui;
633 } tog_io;
634 static int using_mock_io;
635 
636 #define TOG_KEY_SCRDUMP	SHRT_MIN
637 
638 /*
639  * We implement two types of views: parent views and child views.
640  *
641  * The 'Tab' key switches focus between a parent view and its child view.
642  * Child views are shown side-by-side to their parent view, provided
643  * there is enough screen estate.
644  *
645  * When a new view is opened from within a parent view, this new view
646  * becomes a child view of the parent view, replacing any existing child.
647  *
648  * When a new view is opened from within a child view, this new view
649  * becomes a parent view which will obscure the views below until the
650  * user quits the new parent view by typing 'q'.
651  *
652  * This list of views contains parent views only.
653  * Child views are only pointed to by their parent view.
654  */
655 TAILQ_HEAD(tog_view_list_head, tog_view);
656 
657 struct tog_view {
658 	TAILQ_ENTRY(tog_view) entry;
659 	WINDOW *window;
660 	PANEL *panel;
661 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
662 	int resized_y, resized_x; /* begin_y/x based on user resizing */
663 	int maxx, x; /* max column and current start column */
664 	int lines, cols; /* copies of LINES and COLS */
665 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
666 	int gline, hiline; /* navigate to and highlight this nG line */
667 	int ch, count; /* current keymap and count prefix */
668 	int resized; /* set when in a resize event */
669 	int focussed; /* Only set on one parent or child view at a time. */
670 	int dying;
671 	struct tog_view *parent;
672 	struct tog_view *child;
673 
674 	/*
675 	 * This flag is initially set on parent views when a new child view
676 	 * is created. It gets toggled when the 'Tab' key switches focus
677 	 * between parent and child.
678 	 * The flag indicates whether focus should be passed on to our child
679 	 * view if this parent view gets picked for focus after another parent
680 	 * view was closed. This prevents child views from losing focus in such
681 	 * situations.
682 	 */
683 	int focus_child;
684 
685 	enum tog_view_mode mode;
686 	/* type-specific state */
687 	enum tog_view_type type;
688 	union {
689 		struct tog_diff_view_state diff;
690 		struct tog_log_view_state log;
691 		struct tog_blame_view_state blame;
692 		struct tog_tree_view_state tree;
693 		struct tog_ref_view_state ref;
694 		struct tog_help_view_state help;
695 	} state;
696 
697 	const struct got_error *(*show)(struct tog_view *);
698 	const struct got_error *(*input)(struct tog_view **,
699 	    struct tog_view *, int);
700 	const struct got_error *(*reset)(struct tog_view *);
701 	const struct got_error *(*resize)(struct tog_view *, int);
702 	const struct got_error *(*close)(struct tog_view *);
703 
704 	const struct got_error *(*search_start)(struct tog_view *);
705 	const struct got_error *(*search_next)(struct tog_view *);
706 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
707 	    int **, int **, int **, int **);
708 	int search_started;
709 	int searching;
710 #define TOG_SEARCH_FORWARD	1
711 #define TOG_SEARCH_BACKWARD	2
712 	int search_next_done;
713 #define TOG_SEARCH_HAVE_MORE	1
714 #define TOG_SEARCH_NO_MORE	2
715 #define TOG_SEARCH_HAVE_NONE	3
716 	regex_t regex;
717 	regmatch_t regmatch;
718 	const char *action;
719 };
720 
721 static const struct got_error *open_diff_view(struct tog_view *,
722     struct got_object_id *, struct got_object_id *,
723     const char *, const char *, int, int, int, struct tog_view *,
724     struct got_repository *);
725 static const struct got_error *show_diff_view(struct tog_view *);
726 static const struct got_error *input_diff_view(struct tog_view **,
727     struct tog_view *, int);
728 static const struct got_error *reset_diff_view(struct tog_view *);
729 static const struct got_error* close_diff_view(struct tog_view *);
730 static const struct got_error *search_start_diff_view(struct tog_view *);
731 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
732     size_t *, int **, int **, int **, int **);
733 static const struct got_error *search_next_view_match(struct tog_view *);
734 
735 static const struct got_error *open_log_view(struct tog_view *,
736     struct got_object_id *, struct got_repository *,
737     const char *, const char *, int, struct got_worktree *);
738 static const struct got_error * show_log_view(struct tog_view *);
739 static const struct got_error *input_log_view(struct tog_view **,
740     struct tog_view *, int);
741 static const struct got_error *resize_log_view(struct tog_view *, int);
742 static const struct got_error *close_log_view(struct tog_view *);
743 static const struct got_error *search_start_log_view(struct tog_view *);
744 static const struct got_error *search_next_log_view(struct tog_view *);
745 
746 static const struct got_error *open_blame_view(struct tog_view *, char *,
747     struct got_object_id *, struct got_repository *);
748 static const struct got_error *show_blame_view(struct tog_view *);
749 static const struct got_error *input_blame_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *reset_blame_view(struct tog_view *);
752 static const struct got_error *close_blame_view(struct tog_view *);
753 static const struct got_error *search_start_blame_view(struct tog_view *);
754 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
755     size_t *, int **, int **, int **, int **);
756 
757 static const struct got_error *open_tree_view(struct tog_view *,
758     struct got_object_id *, const char *, struct got_repository *);
759 static const struct got_error *show_tree_view(struct tog_view *);
760 static const struct got_error *input_tree_view(struct tog_view **,
761     struct tog_view *, int);
762 static const struct got_error *close_tree_view(struct tog_view *);
763 static const struct got_error *search_start_tree_view(struct tog_view *);
764 static const struct got_error *search_next_tree_view(struct tog_view *);
765 
766 static const struct got_error *open_ref_view(struct tog_view *,
767     struct got_repository *);
768 static const struct got_error *show_ref_view(struct tog_view *);
769 static const struct got_error *input_ref_view(struct tog_view **,
770     struct tog_view *, int);
771 static const struct got_error *close_ref_view(struct tog_view *);
772 static const struct got_error *search_start_ref_view(struct tog_view *);
773 static const struct got_error *search_next_ref_view(struct tog_view *);
774 
775 static const struct got_error *open_help_view(struct tog_view *,
776     struct tog_view *);
777 static const struct got_error *show_help_view(struct tog_view *);
778 static const struct got_error *input_help_view(struct tog_view **,
779     struct tog_view *, int);
780 static const struct got_error *reset_help_view(struct tog_view *);
781 static const struct got_error* close_help_view(struct tog_view *);
782 static const struct got_error *search_start_help_view(struct tog_view *);
783 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
784     size_t *, int **, int **, int **, int **);
785 
786 static volatile sig_atomic_t tog_sigwinch_received;
787 static volatile sig_atomic_t tog_sigpipe_received;
788 static volatile sig_atomic_t tog_sigcont_received;
789 static volatile sig_atomic_t tog_sigint_received;
790 static volatile sig_atomic_t tog_sigterm_received;
791 
792 static void
793 tog_sigwinch(int signo)
794 {
795 	tog_sigwinch_received = 1;
796 }
797 
798 static void
799 tog_sigpipe(int signo)
800 {
801 	tog_sigpipe_received = 1;
802 }
803 
804 static void
805 tog_sigcont(int signo)
806 {
807 	tog_sigcont_received = 1;
808 }
809 
810 static void
811 tog_sigint(int signo)
812 {
813 	tog_sigint_received = 1;
814 }
815 
816 static void
817 tog_sigterm(int signo)
818 {
819 	tog_sigterm_received = 1;
820 }
821 
822 static int
823 tog_fatal_signal_received(void)
824 {
825 	return (tog_sigpipe_received ||
826 	    tog_sigint_received || tog_sigterm_received);
827 }
828 
829 static const struct got_error *
830 view_close(struct tog_view *view)
831 {
832 	const struct got_error *err = NULL, *child_err = NULL;
833 
834 	if (view->child) {
835 		child_err = view_close(view->child);
836 		view->child = NULL;
837 	}
838 	if (view->close)
839 		err = view->close(view);
840 	if (view->panel)
841 		del_panel(view->panel);
842 	if (view->window)
843 		delwin(view->window);
844 	free(view);
845 	return err ? err : child_err;
846 }
847 
848 static struct tog_view *
849 view_open(int nlines, int ncols, int begin_y, int begin_x,
850     enum tog_view_type type)
851 {
852 	struct tog_view *view = calloc(1, sizeof(*view));
853 
854 	if (view == NULL)
855 		return NULL;
856 
857 	view->type = type;
858 	view->lines = LINES;
859 	view->cols = COLS;
860 	view->nlines = nlines ? nlines : LINES - begin_y;
861 	view->ncols = ncols ? ncols : COLS - begin_x;
862 	view->begin_y = begin_y;
863 	view->begin_x = begin_x;
864 	view->window = newwin(nlines, ncols, begin_y, begin_x);
865 	if (view->window == NULL) {
866 		view_close(view);
867 		return NULL;
868 	}
869 	view->panel = new_panel(view->window);
870 	if (view->panel == NULL ||
871 	    set_panel_userptr(view->panel, view) != OK) {
872 		view_close(view);
873 		return NULL;
874 	}
875 
876 	keypad(view->window, TRUE);
877 	return view;
878 }
879 
880 static int
881 view_split_begin_x(int begin_x)
882 {
883 	if (begin_x > 0 || COLS < 120)
884 		return 0;
885 	return (COLS - MAX(COLS / 2, 80));
886 }
887 
888 /* XXX Stub till we decide what to do. */
889 static int
890 view_split_begin_y(int lines)
891 {
892 	return lines * HSPLIT_SCALE;
893 }
894 
895 static const struct got_error *view_resize(struct tog_view *);
896 
897 static const struct got_error *
898 view_splitscreen(struct tog_view *view)
899 {
900 	const struct got_error *err = NULL;
901 
902 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
903 		if (view->resized_y && view->resized_y < view->lines)
904 			view->begin_y = view->resized_y;
905 		else
906 			view->begin_y = view_split_begin_y(view->nlines);
907 		view->begin_x = 0;
908 	} else if (!view->resized) {
909 		if (view->resized_x && view->resized_x < view->cols - 1 &&
910 		    view->cols > 119)
911 			view->begin_x = view->resized_x;
912 		else
913 			view->begin_x = view_split_begin_x(0);
914 		view->begin_y = 0;
915 	}
916 	view->nlines = LINES - view->begin_y;
917 	view->ncols = COLS - view->begin_x;
918 	view->lines = LINES;
919 	view->cols = COLS;
920 	err = view_resize(view);
921 	if (err)
922 		return err;
923 
924 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
925 		view->parent->nlines = view->begin_y;
926 
927 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
928 		return got_error_from_errno("mvwin");
929 
930 	return NULL;
931 }
932 
933 static const struct got_error *
934 view_fullscreen(struct tog_view *view)
935 {
936 	const struct got_error *err = NULL;
937 
938 	view->begin_x = 0;
939 	view->begin_y = view->resized ? view->begin_y : 0;
940 	view->nlines = view->resized ? view->nlines : LINES;
941 	view->ncols = COLS;
942 	view->lines = LINES;
943 	view->cols = COLS;
944 	err = view_resize(view);
945 	if (err)
946 		return err;
947 
948 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
949 		return got_error_from_errno("mvwin");
950 
951 	return NULL;
952 }
953 
954 static int
955 view_is_parent_view(struct tog_view *view)
956 {
957 	return view->parent == NULL;
958 }
959 
960 static int
961 view_is_splitscreen(struct tog_view *view)
962 {
963 	return view->begin_x > 0 || view->begin_y > 0;
964 }
965 
966 static int
967 view_is_fullscreen(struct tog_view *view)
968 {
969 	return view->nlines == LINES && view->ncols == COLS;
970 }
971 
972 static int
973 view_is_hsplit_top(struct tog_view *view)
974 {
975 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
976 	    view_is_splitscreen(view->child);
977 }
978 
979 static void
980 view_border(struct tog_view *view)
981 {
982 	PANEL *panel;
983 	const struct tog_view *view_above;
984 
985 	if (view->parent)
986 		return view_border(view->parent);
987 
988 	panel = panel_above(view->panel);
989 	if (panel == NULL)
990 		return;
991 
992 	view_above = panel_userptr(panel);
993 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
994 		mvwhline(view->window, view_above->begin_y - 1,
995 		    view->begin_x, ACS_HLINE, view->ncols);
996 	else
997 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
998 		    ACS_VLINE, view->nlines);
999 }
1000 
1001 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1002 static const struct got_error *request_log_commits(struct tog_view *);
1003 static const struct got_error *offset_selection_down(struct tog_view *);
1004 static void offset_selection_up(struct tog_view *);
1005 static void view_get_split(struct tog_view *, int *, int *);
1006 
1007 static const struct got_error *
1008 view_resize(struct tog_view *view)
1009 {
1010 	const struct got_error	*err = NULL;
1011 	int			 dif, nlines, ncols;
1012 
1013 	dif = LINES - view->lines;  /* line difference */
1014 
1015 	if (view->lines > LINES)
1016 		nlines = view->nlines - (view->lines - LINES);
1017 	else
1018 		nlines = view->nlines + (LINES - view->lines);
1019 	if (view->cols > COLS)
1020 		ncols = view->ncols - (view->cols - COLS);
1021 	else
1022 		ncols = view->ncols + (COLS - view->cols);
1023 
1024 	if (view->child) {
1025 		int hs = view->child->begin_y;
1026 
1027 		if (!view_is_fullscreen(view))
1028 			view->child->begin_x = view_split_begin_x(view->begin_x);
1029 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1030 		    view->child->begin_x == 0) {
1031 			ncols = COLS;
1032 
1033 			view_fullscreen(view->child);
1034 			if (view->child->focussed)
1035 				show_panel(view->child->panel);
1036 			else
1037 				show_panel(view->panel);
1038 		} else {
1039 			ncols = view->child->begin_x;
1040 
1041 			view_splitscreen(view->child);
1042 			show_panel(view->child->panel);
1043 		}
1044 		/*
1045 		 * XXX This is ugly and needs to be moved into the above
1046 		 * logic but "works" for now and my attempts at moving it
1047 		 * break either 'tab' or 'F' key maps in horizontal splits.
1048 		 */
1049 		if (hs) {
1050 			err = view_splitscreen(view->child);
1051 			if (err)
1052 				return err;
1053 			if (dif < 0) { /* top split decreased */
1054 				err = offset_selection_down(view);
1055 				if (err)
1056 					return err;
1057 			}
1058 			view_border(view);
1059 			update_panels();
1060 			doupdate();
1061 			show_panel(view->child->panel);
1062 			nlines = view->nlines;
1063 		}
1064 	} else if (view->parent == NULL)
1065 		ncols = COLS;
1066 
1067 	if (view->resize && dif > 0) {
1068 		err = view->resize(view, dif);
1069 		if (err)
1070 			return err;
1071 	}
1072 
1073 	if (wresize(view->window, nlines, ncols) == ERR)
1074 		return got_error_from_errno("wresize");
1075 	if (replace_panel(view->panel, view->window) == ERR)
1076 		return got_error_from_errno("replace_panel");
1077 	wclear(view->window);
1078 
1079 	view->nlines = nlines;
1080 	view->ncols = ncols;
1081 	view->lines = LINES;
1082 	view->cols = COLS;
1083 
1084 	return NULL;
1085 }
1086 
1087 static const struct got_error *
1088 resize_log_view(struct tog_view *view, int increase)
1089 {
1090 	struct tog_log_view_state	*s = &view->state.log;
1091 	const struct got_error		*err = NULL;
1092 	int				 n = 0;
1093 
1094 	if (s->selected_entry)
1095 		n = s->selected_entry->idx + view->lines - s->selected;
1096 
1097 	/*
1098 	 * Request commits to account for the increased
1099 	 * height so we have enough to populate the view.
1100 	 */
1101 	if (s->commits->ncommits < n) {
1102 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1103 		err = request_log_commits(view);
1104 	}
1105 
1106 	return err;
1107 }
1108 
1109 static void
1110 view_adjust_offset(struct tog_view *view, int n)
1111 {
1112 	if (n == 0)
1113 		return;
1114 
1115 	if (view->parent && view->parent->offset) {
1116 		if (view->parent->offset + n >= 0)
1117 			view->parent->offset += n;
1118 		else
1119 			view->parent->offset = 0;
1120 	} else if (view->offset) {
1121 		if (view->offset - n >= 0)
1122 			view->offset -= n;
1123 		else
1124 			view->offset = 0;
1125 	}
1126 }
1127 
1128 static const struct got_error *
1129 view_resize_split(struct tog_view *view, int resize)
1130 {
1131 	const struct got_error	*err = NULL;
1132 	struct tog_view		*v = NULL;
1133 
1134 	if (view->parent)
1135 		v = view->parent;
1136 	else
1137 		v = view;
1138 
1139 	if (!v->child || !view_is_splitscreen(v->child))
1140 		return NULL;
1141 
1142 	v->resized = v->child->resized = resize;  /* lock for resize event */
1143 
1144 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1145 		if (v->child->resized_y)
1146 			v->child->begin_y = v->child->resized_y;
1147 		if (view->parent)
1148 			v->child->begin_y -= resize;
1149 		else
1150 			v->child->begin_y += resize;
1151 		if (v->child->begin_y < 3) {
1152 			view->count = 0;
1153 			v->child->begin_y = 3;
1154 		} else if (v->child->begin_y > LINES - 1) {
1155 			view->count = 0;
1156 			v->child->begin_y = LINES - 1;
1157 		}
1158 		v->ncols = COLS;
1159 		v->child->ncols = COLS;
1160 		view_adjust_offset(view, resize);
1161 		err = view_init_hsplit(v, v->child->begin_y);
1162 		if (err)
1163 			return err;
1164 		v->child->resized_y = v->child->begin_y;
1165 	} else {
1166 		if (v->child->resized_x)
1167 			v->child->begin_x = v->child->resized_x;
1168 		if (view->parent)
1169 			v->child->begin_x -= resize;
1170 		else
1171 			v->child->begin_x += resize;
1172 		if (v->child->begin_x < 11) {
1173 			view->count = 0;
1174 			v->child->begin_x = 11;
1175 		} else if (v->child->begin_x > COLS - 1) {
1176 			view->count = 0;
1177 			v->child->begin_x = COLS - 1;
1178 		}
1179 		v->child->resized_x = v->child->begin_x;
1180 	}
1181 
1182 	v->child->mode = v->mode;
1183 	v->child->nlines = v->lines - v->child->begin_y;
1184 	v->child->ncols = v->cols - v->child->begin_x;
1185 	v->focus_child = 1;
1186 
1187 	err = view_fullscreen(v);
1188 	if (err)
1189 		return err;
1190 	err = view_splitscreen(v->child);
1191 	if (err)
1192 		return err;
1193 
1194 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1195 		err = offset_selection_down(v->child);
1196 		if (err)
1197 			return err;
1198 	}
1199 
1200 	if (v->resize)
1201 		err = v->resize(v, 0);
1202 	else if (v->child->resize)
1203 		err = v->child->resize(v->child, 0);
1204 
1205 	v->resized = v->child->resized = 0;
1206 
1207 	return err;
1208 }
1209 
1210 static void
1211 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1212 {
1213 	struct tog_view *v = src->child ? src->child : src;
1214 
1215 	dst->resized_x = v->resized_x;
1216 	dst->resized_y = v->resized_y;
1217 }
1218 
1219 static const struct got_error *
1220 view_close_child(struct tog_view *view)
1221 {
1222 	const struct got_error *err = NULL;
1223 
1224 	if (view->child == NULL)
1225 		return NULL;
1226 
1227 	err = view_close(view->child);
1228 	view->child = NULL;
1229 	return err;
1230 }
1231 
1232 static const struct got_error *
1233 view_set_child(struct tog_view *view, struct tog_view *child)
1234 {
1235 	const struct got_error *err = NULL;
1236 
1237 	view->child = child;
1238 	child->parent = view;
1239 
1240 	err = view_resize(view);
1241 	if (err)
1242 		return err;
1243 
1244 	if (view->child->resized_x || view->child->resized_y)
1245 		err = view_resize_split(view, 0);
1246 
1247 	return err;
1248 }
1249 
1250 static const struct got_error *view_dispatch_request(struct tog_view **,
1251     struct tog_view *, enum tog_view_type, int, int);
1252 
1253 static const struct got_error *
1254 view_request_new(struct tog_view **requested, struct tog_view *view,
1255     enum tog_view_type request)
1256 {
1257 	struct tog_view		*new_view = NULL;
1258 	const struct got_error	*err;
1259 	int			 y = 0, x = 0;
1260 
1261 	*requested = NULL;
1262 
1263 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1264 		view_get_split(view, &y, &x);
1265 
1266 	err = view_dispatch_request(&new_view, view, request, y, x);
1267 	if (err)
1268 		return err;
1269 
1270 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1271 	    request != TOG_VIEW_HELP) {
1272 		err = view_init_hsplit(view, y);
1273 		if (err)
1274 			return err;
1275 	}
1276 
1277 	view->focussed = 0;
1278 	new_view->focussed = 1;
1279 	new_view->mode = view->mode;
1280 	new_view->nlines = request == TOG_VIEW_HELP ?
1281 	    view->lines : view->lines - y;
1282 
1283 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1284 		view_transfer_size(new_view, view);
1285 		err = view_close_child(view);
1286 		if (err)
1287 			return err;
1288 		err = view_set_child(view, new_view);
1289 		if (err)
1290 			return err;
1291 		view->focus_child = 1;
1292 	} else
1293 		*requested = new_view;
1294 
1295 	return NULL;
1296 }
1297 
1298 static void
1299 tog_resizeterm(void)
1300 {
1301 	int cols, lines;
1302 	struct winsize size;
1303 
1304 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1305 		cols = 80;     /* Default */
1306 		lines = 24;
1307 	} else {
1308 		cols = size.ws_col;
1309 		lines = size.ws_row;
1310 	}
1311 	resize_term(lines, cols);
1312 }
1313 
1314 static const struct got_error *
1315 view_search_start(struct tog_view *view, int fast_refresh)
1316 {
1317 	const struct got_error *err = NULL;
1318 	struct tog_view *v = view;
1319 	char pattern[1024];
1320 	int ret;
1321 
1322 	if (view->search_started) {
1323 		regfree(&view->regex);
1324 		view->searching = 0;
1325 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1326 	}
1327 	view->search_started = 0;
1328 
1329 	if (view->nlines < 1)
1330 		return NULL;
1331 
1332 	if (view_is_hsplit_top(view))
1333 		v = view->child;
1334 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1335 		v = view->parent;
1336 
1337 	if (tog_io.input_str != NULL) {
1338 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
1339 		    sizeof(pattern))
1340 			return got_error(GOT_ERR_NO_SPACE);
1341 	} else {
1342 		mvwaddstr(v->window, v->nlines - 1, 0, "/");
1343 		wclrtoeol(v->window);
1344 		nodelay(v->window, FALSE);  /* block for search term input */
1345 		nocbreak();
1346 		echo();
1347 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
1348 		wrefresh(v->window);
1349 		cbreak();
1350 		noecho();
1351 		nodelay(v->window, TRUE);
1352 		if (!fast_refresh && !using_mock_io)
1353 			halfdelay(10);
1354 		if (ret == ERR)
1355 			return NULL;
1356 	}
1357 
1358 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1359 		err = view->search_start(view);
1360 		if (err) {
1361 			regfree(&view->regex);
1362 			return err;
1363 		}
1364 		view->search_started = 1;
1365 		view->searching = TOG_SEARCH_FORWARD;
1366 		view->search_next_done = 0;
1367 		view->search_next(view);
1368 	}
1369 
1370 	return NULL;
1371 }
1372 
1373 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1374 static const struct got_error *
1375 switch_split(struct tog_view *view)
1376 {
1377 	const struct got_error	*err = NULL;
1378 	struct tog_view		*v = NULL;
1379 
1380 	if (view->parent)
1381 		v = view->parent;
1382 	else
1383 		v = view;
1384 
1385 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1386 		v->mode = TOG_VIEW_SPLIT_VERT;
1387 	else
1388 		v->mode = TOG_VIEW_SPLIT_HRZN;
1389 
1390 	if (!v->child)
1391 		return NULL;
1392 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1393 		v->mode = TOG_VIEW_SPLIT_NONE;
1394 
1395 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1396 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1397 		v->child->begin_y = v->child->resized_y;
1398 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1399 		v->child->begin_x = v->child->resized_x;
1400 
1401 
1402 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1403 		v->ncols = COLS;
1404 		v->child->ncols = COLS;
1405 		v->child->nscrolled = LINES - v->child->nlines;
1406 
1407 		err = view_init_hsplit(v, v->child->begin_y);
1408 		if (err)
1409 			return err;
1410 	}
1411 	v->child->mode = v->mode;
1412 	v->child->nlines = v->lines - v->child->begin_y;
1413 	v->focus_child = 1;
1414 
1415 	err = view_fullscreen(v);
1416 	if (err)
1417 		return err;
1418 	err = view_splitscreen(v->child);
1419 	if (err)
1420 		return err;
1421 
1422 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1423 		v->mode = TOG_VIEW_SPLIT_VERT;
1424 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1425 		err = offset_selection_down(v);
1426 		if (err)
1427 			return err;
1428 		err = offset_selection_down(v->child);
1429 		if (err)
1430 			return err;
1431 	} else {
1432 		offset_selection_up(v);
1433 		offset_selection_up(v->child);
1434 	}
1435 	if (v->resize)
1436 		err = v->resize(v, 0);
1437 	else if (v->child->resize)
1438 		err = v->child->resize(v->child, 0);
1439 
1440 	return err;
1441 }
1442 
1443 /*
1444  * Strip trailing whitespace from str starting at byte *n;
1445  * if *n < 0, use strlen(str). Return new str length in *n.
1446  */
1447 static void
1448 strip_trailing_ws(char *str, int *n)
1449 {
1450 	size_t x = *n;
1451 
1452 	if (str == NULL || *str == '\0')
1453 		return;
1454 
1455 	if (x < 0)
1456 		x = strlen(str);
1457 
1458 	while (x-- > 0 && isspace((unsigned char)str[x]))
1459 		str[x] = '\0';
1460 
1461 	*n = x + 1;
1462 }
1463 
1464 /*
1465  * Extract visible substring of line y from the curses screen
1466  * and strip trailing whitespace. If vline is set, overwrite
1467  * line[vline] with '|' because the ACS_VLINE character is
1468  * written out as 'x'. Write the line to file f.
1469  */
1470 static const struct got_error *
1471 view_write_line(FILE *f, int y, int vline)
1472 {
1473 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1474 	int	r, w;
1475 
1476 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1477 	if (r == ERR)
1478 		return got_error_fmt(GOT_ERR_RANGE,
1479 		    "failed to extract line %d", y);
1480 
1481 	/*
1482 	 * In some views, lines are padded with blanks to COLS width.
1483 	 * Strip them so we can diff without the -b flag when testing.
1484 	 */
1485 	strip_trailing_ws(line, &r);
1486 
1487 	if (vline > 0)
1488 		line[vline] = '|';
1489 
1490 	w = fprintf(f, "%s\n", line);
1491 	if (w != r + 1)		/* \n */
1492 		return got_ferror(f, GOT_ERR_IO);
1493 
1494 	return NULL;
1495 }
1496 
1497 /*
1498  * Capture the visible curses screen by writing each line to the
1499  * file at the path set via the TOG_SCR_DUMP environment variable.
1500  */
1501 static const struct got_error *
1502 screendump(struct tog_view *view)
1503 {
1504 	const struct got_error	*err;
1505 	int			 i;
1506 
1507 	err = got_opentemp_truncate(tog_io.sdump);
1508 	if (err)
1509 		return err;
1510 
1511 	if ((view->child && view->child->begin_x) ||
1512 	    (view->parent && view->begin_x)) {
1513 		int ncols = view->child ? view->ncols : view->parent->ncols;
1514 
1515 		/* vertical splitscreen */
1516 		for (i = 0; i < view->nlines; ++i) {
1517 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1518 			if (err)
1519 				goto done;
1520 		}
1521 	} else {
1522 		int hline = 0;
1523 
1524 		/* fullscreen or horizontal splitscreen */
1525 		if ((view->child && view->child->begin_y) ||
1526 		    (view->parent && view->begin_y))	/* hsplit */
1527 			hline = view->child ?
1528 			    view->child->begin_y : view->begin_y;
1529 
1530 		for (i = 0; i < view->lines; i++) {
1531 			if (hline && i == hline - 1) {
1532 				int c;
1533 
1534 				/* ACS_HLINE writes out as 'q', overwrite it */
1535 				for (c = 0; c < view->cols; ++c)
1536 					fputc('-', tog_io.sdump);
1537 				fputc('\n', tog_io.sdump);
1538 				continue;
1539 			}
1540 
1541 			err = view_write_line(tog_io.sdump, i, 0);
1542 			if (err)
1543 				goto done;
1544 		}
1545 	}
1546 
1547 done:
1548 	return err;
1549 }
1550 
1551 /*
1552  * Compute view->count from numeric input. Assign total to view->count and
1553  * return first non-numeric key entered.
1554  */
1555 static int
1556 get_compound_key(struct tog_view *view, int c)
1557 {
1558 	struct tog_view	*v = view;
1559 	int		 x, n = 0;
1560 
1561 	if (view_is_hsplit_top(view))
1562 		v = view->child;
1563 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1564 		v = view->parent;
1565 
1566 	view->count = 0;
1567 	cbreak();  /* block for input */
1568 	nodelay(view->window, FALSE);
1569 	wmove(v->window, v->nlines - 1, 0);
1570 	wclrtoeol(v->window);
1571 	waddch(v->window, ':');
1572 
1573 	do {
1574 		x = getcurx(v->window);
1575 		if (x != ERR && x < view->ncols) {
1576 			waddch(v->window, c);
1577 			wrefresh(v->window);
1578 		}
1579 
1580 		/*
1581 		 * Don't overflow. Max valid request should be the greatest
1582 		 * between the longest and total lines; cap at 10 million.
1583 		 */
1584 		if (n >= 9999999)
1585 			n = 9999999;
1586 		else
1587 			n = n * 10 + (c - '0');
1588 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1589 
1590 	if (c == 'G' || c == 'g') {	/* nG key map */
1591 		view->gline = view->hiline = n;
1592 		n = 0;
1593 		c = 0;
1594 	}
1595 
1596 	/* Massage excessive or inapplicable values at the input handler. */
1597 	view->count = n;
1598 
1599 	return c;
1600 }
1601 
1602 static void
1603 action_report(struct tog_view *view)
1604 {
1605 	struct tog_view *v = view;
1606 
1607 	if (view_is_hsplit_top(view))
1608 		v = view->child;
1609 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1610 		v = view->parent;
1611 
1612 	wmove(v->window, v->nlines - 1, 0);
1613 	wclrtoeol(v->window);
1614 	wprintw(v->window, ":%s", view->action);
1615 	wrefresh(v->window);
1616 
1617 	/*
1618 	 * Clear action status report. Only clear in blame view
1619 	 * once annotating is complete, otherwise it's too fast.
1620 	 */
1621 	if (view->type == TOG_VIEW_BLAME) {
1622 		if (view->state.blame.blame_complete)
1623 			view->action = NULL;
1624 	} else
1625 		view->action = NULL;
1626 }
1627 
1628 /*
1629  * Read the next line from the test script and assign
1630  * key instruction to *ch. If at EOF, set the *done flag.
1631  */
1632 static const struct got_error *
1633 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1634 {
1635 	const struct got_error	*err = NULL;
1636 	char			*line = NULL;
1637 	size_t			 linesz = 0;
1638 	ssize_t			 n;
1639 
1640 
1641 	if (view->count && --view->count) {
1642 		*ch = view->ch;
1643 		return NULL;
1644 	} else
1645 		*ch = -1;
1646 
1647 	if ((n = getline(&line, &linesz, script)) == -1) {
1648 		if (feof(script)) {
1649 			*done = 1;
1650 			goto done;
1651 		} else {
1652 			err = got_ferror(script, GOT_ERR_IO);
1653 			goto done;
1654 		}
1655 	}
1656 
1657 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1658 		tog_io.wait_for_ui = 1;
1659 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1660 		*ch = KEY_ENTER;
1661 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1662 		*ch = KEY_RIGHT;
1663 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1664 		*ch = KEY_LEFT;
1665 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1666 		*ch = KEY_DOWN;
1667 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1668 		*ch = KEY_UP;
1669 	else if (strncasecmp(line, "TAB", 3) == 0)
1670 		*ch = '\t';
1671 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1672 		*ch = TOG_KEY_SCRDUMP;
1673 	else if (isdigit((unsigned char)*line)) {
1674 		char *t = line;
1675 
1676 		while (isdigit((unsigned char)*t))
1677 			++t;
1678 		view->ch = *ch = *t;
1679 		*t = '\0';
1680 		/* ignore error, view->count is 0 if instruction is invalid */
1681 		view->count = strtonum(line, 0, INT_MAX, NULL);
1682 	} else {
1683 		*ch = *line;
1684 		if (n > 2 && (*ch == '/' || *ch == '&')) {
1685 			/* skip leading keymap and trim trailing newline */
1686 			tog_io.input_str = strndup(line + 1, n - 2);
1687 			if (tog_io.input_str == NULL) {
1688 				err = got_error_from_errno("strndup");
1689 				goto done;
1690 			}
1691 		}
1692 	}
1693 
1694 done:
1695 	free(line);
1696 	return err;
1697 }
1698 
1699 static const struct got_error *
1700 view_input(struct tog_view **new, int *done, struct tog_view *view,
1701     struct tog_view_list_head *views, int fast_refresh)
1702 {
1703 	const struct got_error *err = NULL;
1704 	struct tog_view *v;
1705 	int ch, errcode;
1706 
1707 	*new = NULL;
1708 
1709 	if (view->action)
1710 		action_report(view);
1711 
1712 	/* Clear "no matches" indicator. */
1713 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1714 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1715 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1716 		view->count = 0;
1717 	}
1718 
1719 	if (view->searching && !view->search_next_done) {
1720 		errcode = pthread_mutex_unlock(&tog_mutex);
1721 		if (errcode)
1722 			return got_error_set_errno(errcode,
1723 			    "pthread_mutex_unlock");
1724 		sched_yield();
1725 		errcode = pthread_mutex_lock(&tog_mutex);
1726 		if (errcode)
1727 			return got_error_set_errno(errcode,
1728 			    "pthread_mutex_lock");
1729 		view->search_next(view);
1730 		return NULL;
1731 	}
1732 
1733 	/* Allow threads to make progress while we are waiting for input. */
1734 	errcode = pthread_mutex_unlock(&tog_mutex);
1735 	if (errcode)
1736 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1737 
1738 	if (using_mock_io) {
1739 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1740 		if (err) {
1741 			errcode = pthread_mutex_lock(&tog_mutex);
1742 			return err;
1743 		}
1744 	} else if (view->count && --view->count) {
1745 		cbreak();
1746 		nodelay(view->window, TRUE);
1747 		ch = wgetch(view->window);
1748 		/* let C-g or backspace abort unfinished count */
1749 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1750 			view->count = 0;
1751 		else
1752 			ch = view->ch;
1753 	} else {
1754 		ch = wgetch(view->window);
1755 		if (ch >= '1' && ch  <= '9')
1756 			view->ch = ch = get_compound_key(view, ch);
1757 	}
1758 	if (view->hiline && ch != ERR && ch != 0)
1759 		view->hiline = 0;  /* key pressed, clear line highlight */
1760 	nodelay(view->window, TRUE);
1761 	errcode = pthread_mutex_lock(&tog_mutex);
1762 	if (errcode)
1763 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1764 
1765 	if (tog_sigwinch_received || tog_sigcont_received) {
1766 		tog_resizeterm();
1767 		tog_sigwinch_received = 0;
1768 		tog_sigcont_received = 0;
1769 		TAILQ_FOREACH(v, views, entry) {
1770 			err = view_resize(v);
1771 			if (err)
1772 				return err;
1773 			err = v->input(new, v, KEY_RESIZE);
1774 			if (err)
1775 				return err;
1776 			if (v->child) {
1777 				err = view_resize(v->child);
1778 				if (err)
1779 					return err;
1780 				err = v->child->input(new, v->child,
1781 				    KEY_RESIZE);
1782 				if (err)
1783 					return err;
1784 				if (v->child->resized_x || v->child->resized_y) {
1785 					err = view_resize_split(v, 0);
1786 					if (err)
1787 						return err;
1788 				}
1789 			}
1790 		}
1791 	}
1792 
1793 	switch (ch) {
1794 	case '?':
1795 	case 'H':
1796 	case KEY_F(1):
1797 		if (view->type == TOG_VIEW_HELP)
1798 			err = view->reset(view);
1799 		else
1800 			err = view_request_new(new, view, TOG_VIEW_HELP);
1801 		break;
1802 	case '\t':
1803 		view->count = 0;
1804 		if (view->child) {
1805 			view->focussed = 0;
1806 			view->child->focussed = 1;
1807 			view->focus_child = 1;
1808 		} else if (view->parent) {
1809 			view->focussed = 0;
1810 			view->parent->focussed = 1;
1811 			view->parent->focus_child = 0;
1812 			if (!view_is_splitscreen(view)) {
1813 				if (view->parent->resize) {
1814 					err = view->parent->resize(view->parent,
1815 					    0);
1816 					if (err)
1817 						return err;
1818 				}
1819 				offset_selection_up(view->parent);
1820 				err = view_fullscreen(view->parent);
1821 				if (err)
1822 					return err;
1823 			}
1824 		}
1825 		break;
1826 	case 'q':
1827 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1828 			if (view->parent->resize) {
1829 				/* might need more commits to fill fullscreen */
1830 				err = view->parent->resize(view->parent, 0);
1831 				if (err)
1832 					break;
1833 			}
1834 			offset_selection_up(view->parent);
1835 		}
1836 		err = view->input(new, view, ch);
1837 		view->dying = 1;
1838 		break;
1839 	case 'Q':
1840 		*done = 1;
1841 		break;
1842 	case 'F':
1843 		view->count = 0;
1844 		if (view_is_parent_view(view)) {
1845 			if (view->child == NULL)
1846 				break;
1847 			if (view_is_splitscreen(view->child)) {
1848 				view->focussed = 0;
1849 				view->child->focussed = 1;
1850 				err = view_fullscreen(view->child);
1851 			} else {
1852 				err = view_splitscreen(view->child);
1853 				if (!err)
1854 					err = view_resize_split(view, 0);
1855 			}
1856 			if (err)
1857 				break;
1858 			err = view->child->input(new, view->child,
1859 			    KEY_RESIZE);
1860 		} else {
1861 			if (view_is_splitscreen(view)) {
1862 				view->parent->focussed = 0;
1863 				view->focussed = 1;
1864 				err = view_fullscreen(view);
1865 			} else {
1866 				err = view_splitscreen(view);
1867 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1868 					err = view_resize(view->parent);
1869 				if (!err)
1870 					err = view_resize_split(view, 0);
1871 			}
1872 			if (err)
1873 				break;
1874 			err = view->input(new, view, KEY_RESIZE);
1875 		}
1876 		if (err)
1877 			break;
1878 		if (view->resize) {
1879 			err = view->resize(view, 0);
1880 			if (err)
1881 				break;
1882 		}
1883 		if (view->parent) {
1884 			if (view->parent->resize) {
1885 				err = view->parent->resize(view->parent, 0);
1886 				if (err != NULL)
1887 					break;
1888 			}
1889 			err = offset_selection_down(view->parent);
1890 			if (err != NULL)
1891 				break;
1892 		}
1893 		err = offset_selection_down(view);
1894 		break;
1895 	case 'S':
1896 		view->count = 0;
1897 		err = switch_split(view);
1898 		break;
1899 	case '-':
1900 		err = view_resize_split(view, -1);
1901 		break;
1902 	case '+':
1903 		err = view_resize_split(view, 1);
1904 		break;
1905 	case KEY_RESIZE:
1906 		break;
1907 	case '/':
1908 		view->count = 0;
1909 		if (view->search_start)
1910 			view_search_start(view, fast_refresh);
1911 		else
1912 			err = view->input(new, view, ch);
1913 		break;
1914 	case 'N':
1915 	case 'n':
1916 		if (view->search_started && view->search_next) {
1917 			view->searching = (ch == 'n' ?
1918 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1919 			view->search_next_done = 0;
1920 			view->search_next(view);
1921 		} else
1922 			err = view->input(new, view, ch);
1923 		break;
1924 	case 'A':
1925 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1926 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1927 			view->action = "Patience diff algorithm";
1928 		} else {
1929 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1930 			view->action = "Myers diff algorithm";
1931 		}
1932 		TAILQ_FOREACH(v, views, entry) {
1933 			if (v->reset) {
1934 				err = v->reset(v);
1935 				if (err)
1936 					return err;
1937 			}
1938 			if (v->child && v->child->reset) {
1939 				err = v->child->reset(v->child);
1940 				if (err)
1941 					return err;
1942 			}
1943 		}
1944 		break;
1945 	case TOG_KEY_SCRDUMP:
1946 		err = screendump(view);
1947 		break;
1948 	default:
1949 		err = view->input(new, view, ch);
1950 		break;
1951 	}
1952 
1953 	return err;
1954 }
1955 
1956 static int
1957 view_needs_focus_indication(struct tog_view *view)
1958 {
1959 	if (view_is_parent_view(view)) {
1960 		if (view->child == NULL || view->child->focussed)
1961 			return 0;
1962 		if (!view_is_splitscreen(view->child))
1963 			return 0;
1964 	} else if (!view_is_splitscreen(view))
1965 		return 0;
1966 
1967 	return view->focussed;
1968 }
1969 
1970 static const struct got_error *
1971 tog_io_close(void)
1972 {
1973 	const struct got_error *err = NULL;
1974 
1975 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1976 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1977 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1978 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1979 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1980 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1981 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1982 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1983 	if (tog_io.input_str != NULL)
1984 		free(tog_io.input_str);
1985 
1986 	return err;
1987 }
1988 
1989 static const struct got_error *
1990 view_loop(struct tog_view *view)
1991 {
1992 	const struct got_error *err = NULL;
1993 	struct tog_view_list_head views;
1994 	struct tog_view *new_view;
1995 	char *mode;
1996 	int fast_refresh = 10;
1997 	int done = 0, errcode;
1998 
1999 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2000 	if (!mode || !(*mode == 'h' || *mode == 'H'))
2001 		view->mode = TOG_VIEW_SPLIT_VERT;
2002 	else
2003 		view->mode = TOG_VIEW_SPLIT_HRZN;
2004 
2005 	errcode = pthread_mutex_lock(&tog_mutex);
2006 	if (errcode)
2007 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2008 
2009 	TAILQ_INIT(&views);
2010 	TAILQ_INSERT_HEAD(&views, view, entry);
2011 
2012 	view->focussed = 1;
2013 	err = view->show(view);
2014 	if (err)
2015 		return err;
2016 	update_panels();
2017 	doupdate();
2018 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2019 	    !tog_fatal_signal_received()) {
2020 		/* Refresh fast during initialization, then become slower. */
2021 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2022 			halfdelay(10); /* switch to once per second */
2023 
2024 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2025 		if (err)
2026 			break;
2027 
2028 		if (view->dying && view == TAILQ_FIRST(&views) &&
2029 		    TAILQ_NEXT(view, entry) == NULL)
2030 			done = 1;
2031 		if (done) {
2032 			struct tog_view *v;
2033 
2034 			/*
2035 			 * When we quit, scroll the screen up a single line
2036 			 * so we don't lose any information.
2037 			 */
2038 			TAILQ_FOREACH(v, &views, entry) {
2039 				wmove(v->window, 0, 0);
2040 				wdeleteln(v->window);
2041 				wnoutrefresh(v->window);
2042 				if (v->child && !view_is_fullscreen(v)) {
2043 					wmove(v->child->window, 0, 0);
2044 					wdeleteln(v->child->window);
2045 					wnoutrefresh(v->child->window);
2046 				}
2047 			}
2048 			doupdate();
2049 		}
2050 
2051 		if (view->dying) {
2052 			struct tog_view *v, *prev = NULL;
2053 
2054 			if (view_is_parent_view(view))
2055 				prev = TAILQ_PREV(view, tog_view_list_head,
2056 				    entry);
2057 			else if (view->parent)
2058 				prev = view->parent;
2059 
2060 			if (view->parent) {
2061 				view->parent->child = NULL;
2062 				view->parent->focus_child = 0;
2063 				/* Restore fullscreen line height. */
2064 				view->parent->nlines = view->parent->lines;
2065 				err = view_resize(view->parent);
2066 				if (err)
2067 					break;
2068 				/* Make resized splits persist. */
2069 				view_transfer_size(view->parent, view);
2070 			} else
2071 				TAILQ_REMOVE(&views, view, entry);
2072 
2073 			err = view_close(view);
2074 			if (err)
2075 				goto done;
2076 
2077 			view = NULL;
2078 			TAILQ_FOREACH(v, &views, entry) {
2079 				if (v->focussed)
2080 					break;
2081 			}
2082 			if (view == NULL && new_view == NULL) {
2083 				/* No view has focus. Try to pick one. */
2084 				if (prev)
2085 					view = prev;
2086 				else if (!TAILQ_EMPTY(&views)) {
2087 					view = TAILQ_LAST(&views,
2088 					    tog_view_list_head);
2089 				}
2090 				if (view) {
2091 					if (view->focus_child) {
2092 						view->child->focussed = 1;
2093 						view = view->child;
2094 					} else
2095 						view->focussed = 1;
2096 				}
2097 			}
2098 		}
2099 		if (new_view) {
2100 			struct tog_view *v, *t;
2101 			/* Only allow one parent view per type. */
2102 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2103 				if (v->type != new_view->type)
2104 					continue;
2105 				TAILQ_REMOVE(&views, v, entry);
2106 				err = view_close(v);
2107 				if (err)
2108 					goto done;
2109 				break;
2110 			}
2111 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2112 			view = new_view;
2113 		}
2114 		if (view && !done) {
2115 			if (view_is_parent_view(view)) {
2116 				if (view->child && view->child->focussed)
2117 					view = view->child;
2118 			} else {
2119 				if (view->parent && view->parent->focussed)
2120 					view = view->parent;
2121 			}
2122 			show_panel(view->panel);
2123 			if (view->child && view_is_splitscreen(view->child))
2124 				show_panel(view->child->panel);
2125 			if (view->parent && view_is_splitscreen(view)) {
2126 				err = view->parent->show(view->parent);
2127 				if (err)
2128 					goto done;
2129 			}
2130 			err = view->show(view);
2131 			if (err)
2132 				goto done;
2133 			if (view->child) {
2134 				err = view->child->show(view->child);
2135 				if (err)
2136 					goto done;
2137 			}
2138 			update_panels();
2139 			doupdate();
2140 		}
2141 	}
2142 done:
2143 	while (!TAILQ_EMPTY(&views)) {
2144 		const struct got_error *close_err;
2145 		view = TAILQ_FIRST(&views);
2146 		TAILQ_REMOVE(&views, view, entry);
2147 		close_err = view_close(view);
2148 		if (close_err && err == NULL)
2149 			err = close_err;
2150 	}
2151 
2152 	errcode = pthread_mutex_unlock(&tog_mutex);
2153 	if (errcode && err == NULL)
2154 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2155 
2156 	return err;
2157 }
2158 
2159 __dead static void
2160 usage_log(void)
2161 {
2162 	endwin();
2163 	fprintf(stderr,
2164 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2165 	    getprogname());
2166 	exit(1);
2167 }
2168 
2169 /* Create newly allocated wide-character string equivalent to a byte string. */
2170 static const struct got_error *
2171 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2172 {
2173 	char *vis = NULL;
2174 	const struct got_error *err = NULL;
2175 
2176 	*ws = NULL;
2177 	*wlen = mbstowcs(NULL, s, 0);
2178 	if (*wlen == (size_t)-1) {
2179 		int vislen;
2180 		if (errno != EILSEQ)
2181 			return got_error_from_errno("mbstowcs");
2182 
2183 		/* byte string invalid in current encoding; try to "fix" it */
2184 		err = got_mbsavis(&vis, &vislen, s);
2185 		if (err)
2186 			return err;
2187 		*wlen = mbstowcs(NULL, vis, 0);
2188 		if (*wlen == (size_t)-1) {
2189 			err = got_error_from_errno("mbstowcs"); /* give up */
2190 			goto done;
2191 		}
2192 	}
2193 
2194 	*ws = calloc(*wlen + 1, sizeof(**ws));
2195 	if (*ws == NULL) {
2196 		err = got_error_from_errno("calloc");
2197 		goto done;
2198 	}
2199 
2200 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2201 		err = got_error_from_errno("mbstowcs");
2202 done:
2203 	free(vis);
2204 	if (err) {
2205 		free(*ws);
2206 		*ws = NULL;
2207 		*wlen = 0;
2208 	}
2209 	return err;
2210 }
2211 
2212 static const struct got_error *
2213 expand_tab(char **ptr, const char *src)
2214 {
2215 	char	*dst;
2216 	size_t	 len, n, idx = 0, sz = 0;
2217 
2218 	*ptr = NULL;
2219 	n = len = strlen(src);
2220 	dst = malloc(n + 1);
2221 	if (dst == NULL)
2222 		return got_error_from_errno("malloc");
2223 
2224 	while (idx < len && src[idx]) {
2225 		const char c = src[idx];
2226 
2227 		if (c == '\t') {
2228 			size_t nb = TABSIZE - sz % TABSIZE;
2229 			char *p;
2230 
2231 			p = realloc(dst, n + nb);
2232 			if (p == NULL) {
2233 				free(dst);
2234 				return got_error_from_errno("realloc");
2235 
2236 			}
2237 			dst = p;
2238 			n += nb;
2239 			memset(dst + sz, ' ', nb);
2240 			sz += nb;
2241 		} else
2242 			dst[sz++] = src[idx];
2243 		++idx;
2244 	}
2245 
2246 	dst[sz] = '\0';
2247 	*ptr = dst;
2248 	return NULL;
2249 }
2250 
2251 /*
2252  * Advance at most n columns from wline starting at offset off.
2253  * Return the index to the first character after the span operation.
2254  * Return the combined column width of all spanned wide characters in
2255  * *rcol.
2256  */
2257 static int
2258 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2259 {
2260 	int width, i, cols = 0;
2261 
2262 	if (n == 0) {
2263 		*rcol = cols;
2264 		return off;
2265 	}
2266 
2267 	for (i = off; wline[i] != L'\0'; ++i) {
2268 		if (wline[i] == L'\t')
2269 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2270 		else
2271 			width = wcwidth(wline[i]);
2272 
2273 		if (width == -1) {
2274 			width = 1;
2275 			wline[i] = L'.';
2276 		}
2277 
2278 		if (cols + width > n)
2279 			break;
2280 		cols += width;
2281 	}
2282 
2283 	*rcol = cols;
2284 	return i;
2285 }
2286 
2287 /*
2288  * Format a line for display, ensuring that it won't overflow a width limit.
2289  * With scrolling, the width returned refers to the scrolled version of the
2290  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2291  */
2292 static const struct got_error *
2293 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2294     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2295 {
2296 	const struct got_error *err = NULL;
2297 	int cols;
2298 	wchar_t *wline = NULL;
2299 	char *exstr = NULL;
2300 	size_t wlen;
2301 	int i, scrollx;
2302 
2303 	*wlinep = NULL;
2304 	*widthp = 0;
2305 
2306 	if (expand) {
2307 		err = expand_tab(&exstr, line);
2308 		if (err)
2309 			return err;
2310 	}
2311 
2312 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2313 	free(exstr);
2314 	if (err)
2315 		return err;
2316 
2317 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2318 
2319 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2320 		wline[wlen - 1] = L'\0';
2321 		wlen--;
2322 	}
2323 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2324 		wline[wlen - 1] = L'\0';
2325 		wlen--;
2326 	}
2327 
2328 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2329 	wline[i] = L'\0';
2330 
2331 	if (widthp)
2332 		*widthp = cols;
2333 	if (scrollxp)
2334 		*scrollxp = scrollx;
2335 	if (err)
2336 		free(wline);
2337 	else
2338 		*wlinep = wline;
2339 	return err;
2340 }
2341 
2342 static const struct got_error*
2343 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2344     struct got_object_id *id, struct got_repository *repo)
2345 {
2346 	static const struct got_error *err = NULL;
2347 	struct got_reflist_entry *re;
2348 	char *s;
2349 	const char *name;
2350 
2351 	*refs_str = NULL;
2352 
2353 	if (refs == NULL)
2354 		return NULL;
2355 
2356 	TAILQ_FOREACH(re, refs, entry) {
2357 		struct got_tag_object *tag = NULL;
2358 		struct got_object_id *ref_id;
2359 		int cmp;
2360 
2361 		name = got_ref_get_name(re->ref);
2362 		if (strcmp(name, GOT_REF_HEAD) == 0)
2363 			continue;
2364 		if (strncmp(name, "refs/", 5) == 0)
2365 			name += 5;
2366 		if (strncmp(name, "got/", 4) == 0)
2367 			continue;
2368 		if (strncmp(name, "heads/", 6) == 0)
2369 			name += 6;
2370 		if (strncmp(name, "remotes/", 8) == 0) {
2371 			name += 8;
2372 			s = strstr(name, "/" GOT_REF_HEAD);
2373 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2374 				continue;
2375 		}
2376 		err = got_ref_resolve(&ref_id, repo, re->ref);
2377 		if (err)
2378 			break;
2379 		if (strncmp(name, "tags/", 5) == 0) {
2380 			err = got_object_open_as_tag(&tag, repo, ref_id);
2381 			if (err) {
2382 				if (err->code != GOT_ERR_OBJ_TYPE) {
2383 					free(ref_id);
2384 					break;
2385 				}
2386 				/* Ref points at something other than a tag. */
2387 				err = NULL;
2388 				tag = NULL;
2389 			}
2390 		}
2391 		cmp = got_object_id_cmp(tag ?
2392 		    got_object_tag_get_object_id(tag) : ref_id, id);
2393 		free(ref_id);
2394 		if (tag)
2395 			got_object_tag_close(tag);
2396 		if (cmp != 0)
2397 			continue;
2398 		s = *refs_str;
2399 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2400 		    s ? ", " : "", name) == -1) {
2401 			err = got_error_from_errno("asprintf");
2402 			free(s);
2403 			*refs_str = NULL;
2404 			break;
2405 		}
2406 		free(s);
2407 	}
2408 
2409 	return err;
2410 }
2411 
2412 static const struct got_error *
2413 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2414     int col_tab_align)
2415 {
2416 	char *smallerthan;
2417 
2418 	smallerthan = strchr(author, '<');
2419 	if (smallerthan && smallerthan[1] != '\0')
2420 		author = smallerthan + 1;
2421 	author[strcspn(author, "@>")] = '\0';
2422 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2423 	    col_tab_align, 0);
2424 }
2425 
2426 static const struct got_error *
2427 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2428     const size_t date_display_cols, int author_display_cols)
2429 {
2430 	struct tog_log_view_state *s = &view->state.log;
2431 	const struct got_error *err = NULL;
2432 	struct got_commit_object *commit = entry->commit;
2433 	struct got_object_id *id = entry->id;
2434 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2435 	char *refs_str = NULL;
2436 	char *logmsg0 = NULL, *logmsg = NULL;
2437 	char *author = NULL;
2438 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2439 	int author_width, refstr_width, logmsg_width;
2440 	char *newline, *line = NULL;
2441 	int col, limit, scrollx, logmsg_x;
2442 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2443 	struct tm tm;
2444 	time_t committer_time;
2445 	struct tog_color *tc;
2446 	struct got_reflist_head *refs;
2447 
2448 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2449 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2450 		tog_base_commit.idx = entry->idx;
2451 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2452 		int rc;
2453 
2454 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2455 		if (rc)
2456 			return got_error_set_errno(rc, "pthread_cond_wait");
2457 	}
2458 
2459 	committer_time = got_object_commit_get_committer_time(commit);
2460 	if (gmtime_r(&committer_time, &tm) == NULL)
2461 		return got_error_from_errno("gmtime_r");
2462 	if (strftime(datebuf, sizeof(datebuf), "%F ", &tm) == 0)
2463 		return got_error(GOT_ERR_NO_SPACE);
2464 
2465 	if (avail <= date_display_cols)
2466 		limit = MIN(sizeof(datebuf) - 1, avail);
2467 	else
2468 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2469 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2470 	if (tc)
2471 		wattr_on(view->window,
2472 		    COLOR_PAIR(tc->colorpair), NULL);
2473 	waddnstr(view->window, datebuf, limit);
2474 	if (tc)
2475 		wattr_off(view->window,
2476 		    COLOR_PAIR(tc->colorpair), NULL);
2477 	col = limit;
2478 	if (col > avail)
2479 		goto done;
2480 
2481 	if (avail >= 120) {
2482 		char *id_str;
2483 		err = got_object_id_str(&id_str, id);
2484 		if (err)
2485 			goto done;
2486 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2487 		if (tc)
2488 			wattr_on(view->window,
2489 			    COLOR_PAIR(tc->colorpair), NULL);
2490 		wprintw(view->window, "%.8s ", id_str);
2491 		if (tc)
2492 			wattr_off(view->window,
2493 			    COLOR_PAIR(tc->colorpair), NULL);
2494 		free(id_str);
2495 		col += 9;
2496 		if (col > avail)
2497 			goto done;
2498 	}
2499 
2500 	if (s->use_committer)
2501 		author = strdup(got_object_commit_get_committer(commit));
2502 	else
2503 		author = strdup(got_object_commit_get_author(commit));
2504 	if (author == NULL) {
2505 		err = got_error_from_errno("strdup");
2506 		goto done;
2507 	}
2508 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2509 	if (err)
2510 		goto done;
2511 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2512 	if (tc)
2513 		wattr_on(view->window,
2514 		    COLOR_PAIR(tc->colorpair), NULL);
2515 	waddwstr(view->window, wauthor);
2516 	col += author_width;
2517 	while (col < avail && author_width < author_display_cols + 2) {
2518 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2519 		    author_width == marker_column &&
2520 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2521 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2522 			if (tc)
2523 				wattr_on(view->window,
2524 				    COLOR_PAIR(tc->colorpair), NULL);
2525 			waddch(view->window, tog_base_commit.marker);
2526 			if (tc)
2527 				wattr_off(view->window,
2528 				    COLOR_PAIR(tc->colorpair), NULL);
2529 		} else
2530 			waddch(view->window, ' ');
2531 		col++;
2532 		author_width++;
2533 	}
2534 	if (tc)
2535 		wattr_off(view->window,
2536 		    COLOR_PAIR(tc->colorpair), NULL);
2537 	if (col > avail)
2538 		goto done;
2539 
2540 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2541 	if (err)
2542 		goto done;
2543 	logmsg = logmsg0;
2544 	while (*logmsg == '\n')
2545 		logmsg++;
2546 	newline = strchr(logmsg, '\n');
2547 	if (newline)
2548 		*newline = '\0';
2549 
2550 	limit = avail - col;
2551 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2552 		limit--;	/* for the border */
2553 
2554 	/* Prepend reference labels to log message if possible .*/
2555 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2556 	err = build_refs_str(&refs_str, refs, id, s->repo);
2557 	if (err)
2558 		goto done;
2559 	if (refs_str) {
2560 		char *rs;
2561 
2562 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2563 			err = got_error_from_errno("asprintf");
2564 			goto done;
2565 		}
2566 		err = format_line(&wrefstr, &refstr_width,
2567 		    &scrollx, rs, view->x, limit, col, 1);
2568 		free(rs);
2569 		if (err)
2570 			goto done;
2571 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2572 		if (tc)
2573 			wattr_on(view->window,
2574 			    COLOR_PAIR(tc->colorpair), NULL);
2575 		waddwstr(view->window, &wrefstr[scrollx]);
2576 		if (tc)
2577 			wattr_off(view->window,
2578 			    COLOR_PAIR(tc->colorpair), NULL);
2579 		col += MAX(refstr_width, 0);
2580 		if (col > avail)
2581 			goto done;
2582 
2583 		if (col < avail) {
2584 			waddch(view->window, ' ');
2585 			col++;
2586 		}
2587 
2588 		if (refstr_width > 0)
2589 			logmsg_x = 0;
2590 		else {
2591 			int unscrolled_refstr_width;
2592 			size_t len = wcslen(wrefstr);
2593 
2594 			/*
2595 			 * No need to check for -1 return value here since
2596 			 * unprintables have been replaced by span_wline().
2597 			 */
2598 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2599 			unscrolled_refstr_width += 1; /* trailing space */
2600 			logmsg_x = view->x - unscrolled_refstr_width;
2601 		}
2602 
2603 		limit = avail - col;
2604 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2605 			limit--;	/* for the border */
2606 	} else
2607 		logmsg_x = view->x;
2608 
2609 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2610 	    limit, col, 1);
2611 	if (err)
2612 		goto done;
2613 	waddwstr(view->window, &wlogmsg[scrollx]);
2614 	col += MAX(logmsg_width, 0);
2615 	while (col < avail) {
2616 		waddch(view->window, ' ');
2617 		col++;
2618 	}
2619 done:
2620 	free(logmsg0);
2621 	free(wlogmsg);
2622 	free(wrefstr);
2623 	free(refs_str);
2624 	free(author);
2625 	free(wauthor);
2626 	free(line);
2627 	return err;
2628 }
2629 
2630 static struct commit_queue_entry *
2631 alloc_commit_queue_entry(struct got_commit_object *commit,
2632     struct got_object_id *id)
2633 {
2634 	struct commit_queue_entry *entry;
2635 	struct got_object_id *dup;
2636 
2637 	entry = calloc(1, sizeof(*entry));
2638 	if (entry == NULL)
2639 		return NULL;
2640 
2641 	dup = got_object_id_dup(id);
2642 	if (dup == NULL) {
2643 		free(entry);
2644 		return NULL;
2645 	}
2646 
2647 	entry->id = dup;
2648 	entry->commit = commit;
2649 	return entry;
2650 }
2651 
2652 static void
2653 pop_commit(struct commit_queue *commits)
2654 {
2655 	struct commit_queue_entry *entry;
2656 
2657 	entry = TAILQ_FIRST(&commits->head);
2658 	TAILQ_REMOVE(&commits->head, entry, entry);
2659 	got_object_commit_close(entry->commit);
2660 	commits->ncommits--;
2661 	free(entry->id);
2662 	free(entry);
2663 }
2664 
2665 static void
2666 free_commits(struct commit_queue *commits)
2667 {
2668 	while (!TAILQ_EMPTY(&commits->head))
2669 		pop_commit(commits);
2670 }
2671 
2672 static const struct got_error *
2673 match_commit(int *have_match, struct got_object_id *id,
2674     struct got_commit_object *commit, regex_t *regex)
2675 {
2676 	const struct got_error *err = NULL;
2677 	regmatch_t regmatch;
2678 	char *id_str = NULL, *logmsg = NULL;
2679 
2680 	*have_match = 0;
2681 
2682 	err = got_object_id_str(&id_str, id);
2683 	if (err)
2684 		return err;
2685 
2686 	err = got_object_commit_get_logmsg(&logmsg, commit);
2687 	if (err)
2688 		goto done;
2689 
2690 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2691 	    &regmatch, 0) == 0 ||
2692 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2693 	    &regmatch, 0) == 0 ||
2694 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2695 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2696 		*have_match = 1;
2697 done:
2698 	free(id_str);
2699 	free(logmsg);
2700 	return err;
2701 }
2702 
2703 static const struct got_error *
2704 queue_commits(struct tog_log_thread_args *a)
2705 {
2706 	const struct got_error *err = NULL;
2707 
2708 	/*
2709 	 * We keep all commits open throughout the lifetime of the log
2710 	 * view in order to avoid having to re-fetch commits from disk
2711 	 * while updating the display.
2712 	 */
2713 	do {
2714 		struct got_object_id id;
2715 		struct got_commit_object *commit;
2716 		struct commit_queue_entry *entry;
2717 		int limit_match = 0;
2718 		int errcode;
2719 
2720 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2721 		    NULL, NULL);
2722 		if (err)
2723 			break;
2724 
2725 		err = got_object_open_as_commit(&commit, a->repo, &id);
2726 		if (err)
2727 			break;
2728 		entry = alloc_commit_queue_entry(commit, &id);
2729 		if (entry == NULL) {
2730 			err = got_error_from_errno("alloc_commit_queue_entry");
2731 			break;
2732 		}
2733 
2734 		errcode = pthread_mutex_lock(&tog_mutex);
2735 		if (errcode) {
2736 			err = got_error_set_errno(errcode,
2737 			    "pthread_mutex_lock");
2738 			break;
2739 		}
2740 
2741 		entry->idx = a->real_commits->ncommits;
2742 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2743 		a->real_commits->ncommits++;
2744 
2745 		if (*a->limiting) {
2746 			err = match_commit(&limit_match, &id, commit,
2747 			    a->limit_regex);
2748 			if (err)
2749 				break;
2750 
2751 			if (limit_match) {
2752 				struct commit_queue_entry *matched;
2753 
2754 				matched = alloc_commit_queue_entry(
2755 				    entry->commit, entry->id);
2756 				if (matched == NULL) {
2757 					err = got_error_from_errno(
2758 					    "alloc_commit_queue_entry");
2759 					break;
2760 				}
2761 				matched->commit = entry->commit;
2762 				got_object_commit_retain(entry->commit);
2763 
2764 				matched->idx = a->limit_commits->ncommits;
2765 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2766 				    matched, entry);
2767 				a->limit_commits->ncommits++;
2768 			}
2769 
2770 			/*
2771 			 * This is how we signal log_thread() that we
2772 			 * have found a match, and that it should be
2773 			 * counted as a new entry for the view.
2774 			 */
2775 			a->limit_match = limit_match;
2776 		}
2777 
2778 		if (*a->searching == TOG_SEARCH_FORWARD &&
2779 		    !*a->search_next_done) {
2780 			int have_match;
2781 			err = match_commit(&have_match, &id, commit, a->regex);
2782 			if (err)
2783 				break;
2784 
2785 			if (*a->limiting) {
2786 				if (limit_match && have_match)
2787 					*a->search_next_done =
2788 					    TOG_SEARCH_HAVE_MORE;
2789 			} else if (have_match)
2790 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2791 		}
2792 
2793 		errcode = pthread_mutex_unlock(&tog_mutex);
2794 		if (errcode && err == NULL)
2795 			err = got_error_set_errno(errcode,
2796 			    "pthread_mutex_unlock");
2797 		if (err)
2798 			break;
2799 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2800 
2801 	return err;
2802 }
2803 
2804 static void
2805 select_commit(struct tog_log_view_state *s)
2806 {
2807 	struct commit_queue_entry *entry;
2808 	int ncommits = 0;
2809 
2810 	entry = s->first_displayed_entry;
2811 	while (entry) {
2812 		if (ncommits == s->selected) {
2813 			s->selected_entry = entry;
2814 			break;
2815 		}
2816 		entry = TAILQ_NEXT(entry, entry);
2817 		ncommits++;
2818 	}
2819 }
2820 
2821 static const struct got_error *
2822 draw_commits(struct tog_view *view)
2823 {
2824 	const struct got_error *err = NULL;
2825 	struct tog_log_view_state *s = &view->state.log;
2826 	struct commit_queue_entry *entry = s->selected_entry;
2827 	int limit = view->nlines;
2828 	int width;
2829 	int ncommits, author_cols = 4, refstr_cols;
2830 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2831 	char *refs_str = NULL;
2832 	wchar_t *wline;
2833 	struct tog_color *tc;
2834 	static const size_t date_display_cols = 12;
2835 	struct got_reflist_head *refs;
2836 
2837 	if (view_is_hsplit_top(view))
2838 		--limit;  /* account for border */
2839 
2840 	if (s->selected_entry &&
2841 	    !(view->searching && view->search_next_done == 0)) {
2842 		err = got_object_id_str(&id_str, s->selected_entry->id);
2843 		if (err)
2844 			return err;
2845 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2846 		    s->selected_entry->id);
2847 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2848 		    s->repo);
2849 		if (err)
2850 			goto done;
2851 	}
2852 
2853 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2854 		halfdelay(10); /* disable fast refresh */
2855 
2856 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2857 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2858 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2859 		    (view->searching && !view->search_next_done) ?
2860 		    "searching..." : "loading...") == -1) {
2861 			err = got_error_from_errno("asprintf");
2862 			goto done;
2863 		}
2864 	} else {
2865 		const char *search_str = NULL;
2866 		const char *limit_str = NULL;
2867 
2868 		if (view->searching) {
2869 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2870 				search_str = "no more matches";
2871 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2872 				search_str = "no matches found";
2873 			else if (!view->search_next_done)
2874 				search_str = "searching...";
2875 		}
2876 
2877 		if (s->limit_view && s->commits->ncommits == 0)
2878 			limit_str = "no matches found";
2879 
2880 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2881 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2882 		    search_str ? search_str : (refs_str ? refs_str : ""),
2883 		    limit_str ? limit_str : "") == -1) {
2884 			err = got_error_from_errno("asprintf");
2885 			goto done;
2886 		}
2887 	}
2888 
2889 	free(refs_str);
2890 	refs_str = NULL;
2891 
2892 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2893 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2894 		    "........................................",
2895 		    s->in_repo_path, ncommits_str) == -1) {
2896 			err = got_error_from_errno("asprintf");
2897 			header = NULL;
2898 			goto done;
2899 		}
2900 	} else if (asprintf(&header, "commit %s%s",
2901 	    id_str ? id_str : "........................................",
2902 	    ncommits_str) == -1) {
2903 		err = got_error_from_errno("asprintf");
2904 		header = NULL;
2905 		goto done;
2906 	}
2907 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2908 	if (err)
2909 		goto done;
2910 
2911 	werase(view->window);
2912 
2913 	if (view_needs_focus_indication(view))
2914 		wstandout(view->window);
2915 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2916 	if (tc)
2917 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2918 	waddwstr(view->window, wline);
2919 	while (width < view->ncols) {
2920 		waddch(view->window, ' ');
2921 		width++;
2922 	}
2923 	if (tc)
2924 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2925 	if (view_needs_focus_indication(view))
2926 		wstandend(view->window);
2927 	free(wline);
2928 	if (limit <= 1)
2929 		goto done;
2930 
2931 	/* Grow author column size if necessary, and set view->maxx. */
2932 	entry = s->first_displayed_entry;
2933 	ncommits = 0;
2934 	view->maxx = 0;
2935 	while (entry) {
2936 		struct got_commit_object *c = entry->commit;
2937 		char *author, *eol, *msg, *msg0;
2938 		wchar_t *wauthor, *wmsg;
2939 		int width;
2940 		if (ncommits >= limit - 1)
2941 			break;
2942 		if (s->use_committer)
2943 			author = strdup(got_object_commit_get_committer(c));
2944 		else
2945 			author = strdup(got_object_commit_get_author(c));
2946 		if (author == NULL) {
2947 			err = got_error_from_errno("strdup");
2948 			goto done;
2949 		}
2950 		err = format_author(&wauthor, &width, author, COLS,
2951 		    date_display_cols);
2952 		if (author_cols < width)
2953 			author_cols = width;
2954 		free(wauthor);
2955 		free(author);
2956 		if (err)
2957 			goto done;
2958 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2959 		    entry->id);
2960 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2961 		if (err)
2962 			goto done;
2963 		if (refs_str) {
2964 			wchar_t *ws;
2965 			err = format_line(&ws, &width, NULL, refs_str,
2966 			    0, INT_MAX, date_display_cols + author_cols, 0);
2967 			free(ws);
2968 			free(refs_str);
2969 			refs_str = NULL;
2970 			if (err)
2971 				goto done;
2972 			refstr_cols = width + 3; /* account for [ ] + space */
2973 		} else
2974 			refstr_cols = 0;
2975 		err = got_object_commit_get_logmsg(&msg0, c);
2976 		if (err)
2977 			goto done;
2978 		msg = msg0;
2979 		while (*msg == '\n')
2980 			++msg;
2981 		if ((eol = strchr(msg, '\n')))
2982 			*eol = '\0';
2983 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2984 		    date_display_cols + author_cols + refstr_cols, 0);
2985 		if (err)
2986 			goto done;
2987 		view->maxx = MAX(view->maxx, width + refstr_cols);
2988 		free(msg0);
2989 		free(wmsg);
2990 		ncommits++;
2991 		entry = TAILQ_NEXT(entry, entry);
2992 	}
2993 
2994 	entry = s->first_displayed_entry;
2995 	s->last_displayed_entry = s->first_displayed_entry;
2996 	ncommits = 0;
2997 	while (entry) {
2998 		if (ncommits >= limit - 1)
2999 			break;
3000 		if (ncommits == s->selected)
3001 			wstandout(view->window);
3002 		err = draw_commit(view, entry, date_display_cols, author_cols);
3003 		if (ncommits == s->selected)
3004 			wstandend(view->window);
3005 		if (err)
3006 			goto done;
3007 		ncommits++;
3008 		s->last_displayed_entry = entry;
3009 		entry = TAILQ_NEXT(entry, entry);
3010 	}
3011 
3012 	view_border(view);
3013 done:
3014 	free(id_str);
3015 	free(refs_str);
3016 	free(ncommits_str);
3017 	free(header);
3018 	return err;
3019 }
3020 
3021 static void
3022 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3023 {
3024 	struct commit_queue_entry *entry;
3025 	int nscrolled = 0;
3026 
3027 	entry = TAILQ_FIRST(&s->commits->head);
3028 	if (s->first_displayed_entry == entry)
3029 		return;
3030 
3031 	entry = s->first_displayed_entry;
3032 	while (entry && nscrolled < maxscroll) {
3033 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3034 		if (entry) {
3035 			s->first_displayed_entry = entry;
3036 			nscrolled++;
3037 		}
3038 	}
3039 }
3040 
3041 static const struct got_error *
3042 trigger_log_thread(struct tog_view *view, int wait)
3043 {
3044 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3045 	int errcode;
3046 
3047 	if (!using_mock_io)
3048 		halfdelay(1); /* fast refresh while loading commits */
3049 
3050 	while (!ta->log_complete && !tog_thread_error &&
3051 	    (ta->commits_needed > 0 || ta->load_all)) {
3052 		/* Wake the log thread. */
3053 		errcode = pthread_cond_signal(&ta->need_commits);
3054 		if (errcode)
3055 			return got_error_set_errno(errcode,
3056 			    "pthread_cond_signal");
3057 
3058 		/*
3059 		 * The mutex will be released while the view loop waits
3060 		 * in wgetch(), at which time the log thread will run.
3061 		 */
3062 		if (!wait)
3063 			break;
3064 
3065 		/* Display progress update in log view. */
3066 		show_log_view(view);
3067 		update_panels();
3068 		doupdate();
3069 
3070 		/* Wait right here while next commit is being loaded. */
3071 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3072 		if (errcode)
3073 			return got_error_set_errno(errcode,
3074 			    "pthread_cond_wait");
3075 
3076 		/* Display progress update in log view. */
3077 		show_log_view(view);
3078 		update_panels();
3079 		doupdate();
3080 	}
3081 
3082 	return NULL;
3083 }
3084 
3085 static const struct got_error *
3086 request_log_commits(struct tog_view *view)
3087 {
3088 	struct tog_log_view_state	*state = &view->state.log;
3089 	const struct got_error		*err = NULL;
3090 
3091 	if (state->thread_args.log_complete)
3092 		return NULL;
3093 
3094 	state->thread_args.commits_needed += view->nscrolled;
3095 	err = trigger_log_thread(view, 1);
3096 	view->nscrolled = 0;
3097 
3098 	return err;
3099 }
3100 
3101 static const struct got_error *
3102 log_scroll_down(struct tog_view *view, int maxscroll)
3103 {
3104 	struct tog_log_view_state *s = &view->state.log;
3105 	const struct got_error *err = NULL;
3106 	struct commit_queue_entry *pentry;
3107 	int nscrolled = 0, ncommits_needed;
3108 
3109 	if (s->last_displayed_entry == NULL)
3110 		return NULL;
3111 
3112 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3113 	if (s->commits->ncommits < ncommits_needed &&
3114 	    !s->thread_args.log_complete) {
3115 		/*
3116 		 * Ask the log thread for required amount of commits.
3117 		 */
3118 		s->thread_args.commits_needed +=
3119 		    ncommits_needed - s->commits->ncommits;
3120 		err = trigger_log_thread(view, 1);
3121 		if (err)
3122 			return err;
3123 	}
3124 
3125 	do {
3126 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3127 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3128 			break;
3129 
3130 		s->last_displayed_entry = pentry ?
3131 		    pentry : s->last_displayed_entry;
3132 
3133 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3134 		if (pentry == NULL)
3135 			break;
3136 		s->first_displayed_entry = pentry;
3137 	} while (++nscrolled < maxscroll);
3138 
3139 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3140 		view->nscrolled += nscrolled;
3141 	else
3142 		view->nscrolled = 0;
3143 
3144 	return err;
3145 }
3146 
3147 static const struct got_error *
3148 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3149     struct got_commit_object *commit, struct got_object_id *commit_id,
3150     struct tog_view *log_view, struct got_repository *repo)
3151 {
3152 	const struct got_error *err;
3153 	struct got_object_qid *parent_id;
3154 	struct tog_view *diff_view;
3155 
3156 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3157 	if (diff_view == NULL)
3158 		return got_error_from_errno("view_open");
3159 
3160 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3161 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3162 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3163 	if (err == NULL)
3164 		*new_view = diff_view;
3165 	return err;
3166 }
3167 
3168 static const struct got_error *
3169 tree_view_visit_subtree(struct tog_tree_view_state *s,
3170     struct got_tree_object *subtree)
3171 {
3172 	struct tog_parent_tree *parent;
3173 
3174 	parent = calloc(1, sizeof(*parent));
3175 	if (parent == NULL)
3176 		return got_error_from_errno("calloc");
3177 
3178 	parent->tree = s->tree;
3179 	parent->first_displayed_entry = s->first_displayed_entry;
3180 	parent->selected_entry = s->selected_entry;
3181 	parent->selected = s->selected;
3182 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3183 	s->tree = subtree;
3184 	s->selected = 0;
3185 	s->first_displayed_entry = NULL;
3186 	return NULL;
3187 }
3188 
3189 static const struct got_error *
3190 tree_view_walk_path(struct tog_tree_view_state *s,
3191     struct got_commit_object *commit, const char *path)
3192 {
3193 	const struct got_error *err = NULL;
3194 	struct got_tree_object *tree = NULL;
3195 	const char *p;
3196 	char *slash, *subpath = NULL;
3197 
3198 	/* Walk the path and open corresponding tree objects. */
3199 	p = path;
3200 	while (*p) {
3201 		struct got_tree_entry *te;
3202 		struct got_object_id *tree_id;
3203 		char *te_name;
3204 
3205 		while (p[0] == '/')
3206 			p++;
3207 
3208 		/* Ensure the correct subtree entry is selected. */
3209 		slash = strchr(p, '/');
3210 		if (slash == NULL)
3211 			te_name = strdup(p);
3212 		else
3213 			te_name = strndup(p, slash - p);
3214 		if (te_name == NULL) {
3215 			err = got_error_from_errno("strndup");
3216 			break;
3217 		}
3218 		te = got_object_tree_find_entry(s->tree, te_name);
3219 		if (te == NULL) {
3220 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3221 			free(te_name);
3222 			break;
3223 		}
3224 		free(te_name);
3225 		s->first_displayed_entry = s->selected_entry = te;
3226 
3227 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3228 			break; /* jump to this file's entry */
3229 
3230 		slash = strchr(p, '/');
3231 		if (slash)
3232 			subpath = strndup(path, slash - path);
3233 		else
3234 			subpath = strdup(path);
3235 		if (subpath == NULL) {
3236 			err = got_error_from_errno("strdup");
3237 			break;
3238 		}
3239 
3240 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3241 		    subpath);
3242 		if (err)
3243 			break;
3244 
3245 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3246 		free(tree_id);
3247 		if (err)
3248 			break;
3249 
3250 		err = tree_view_visit_subtree(s, tree);
3251 		if (err) {
3252 			got_object_tree_close(tree);
3253 			break;
3254 		}
3255 		if (slash == NULL)
3256 			break;
3257 		free(subpath);
3258 		subpath = NULL;
3259 		p = slash;
3260 	}
3261 
3262 	free(subpath);
3263 	return err;
3264 }
3265 
3266 static const struct got_error *
3267 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3268     struct commit_queue_entry *entry, const char *path,
3269     const char *head_ref_name, struct got_repository *repo)
3270 {
3271 	const struct got_error *err = NULL;
3272 	struct tog_tree_view_state *s;
3273 	struct tog_view *tree_view;
3274 
3275 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3276 	if (tree_view == NULL)
3277 		return got_error_from_errno("view_open");
3278 
3279 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3280 	if (err)
3281 		return err;
3282 	s = &tree_view->state.tree;
3283 
3284 	*new_view = tree_view;
3285 
3286 	if (got_path_is_root_dir(path))
3287 		return NULL;
3288 
3289 	return tree_view_walk_path(s, entry->commit, path);
3290 }
3291 
3292 static const struct got_error *
3293 block_signals_used_by_main_thread(void)
3294 {
3295 	sigset_t sigset;
3296 	int errcode;
3297 
3298 	if (sigemptyset(&sigset) == -1)
3299 		return got_error_from_errno("sigemptyset");
3300 
3301 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3302 	if (sigaddset(&sigset, SIGWINCH) == -1)
3303 		return got_error_from_errno("sigaddset");
3304 	if (sigaddset(&sigset, SIGCONT) == -1)
3305 		return got_error_from_errno("sigaddset");
3306 	if (sigaddset(&sigset, SIGINT) == -1)
3307 		return got_error_from_errno("sigaddset");
3308 	if (sigaddset(&sigset, SIGTERM) == -1)
3309 		return got_error_from_errno("sigaddset");
3310 
3311 	/* ncurses handles SIGTSTP */
3312 	if (sigaddset(&sigset, SIGTSTP) == -1)
3313 		return got_error_from_errno("sigaddset");
3314 
3315 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3316 	if (errcode)
3317 		return got_error_set_errno(errcode, "pthread_sigmask");
3318 
3319 	return NULL;
3320 }
3321 
3322 static void *
3323 log_thread(void *arg)
3324 {
3325 	const struct got_error *err = NULL;
3326 	int errcode = 0;
3327 	struct tog_log_thread_args *a = arg;
3328 	int done = 0;
3329 
3330 	/*
3331 	 * Sync startup with main thread such that we begin our
3332 	 * work once view_input() has released the mutex.
3333 	 */
3334 	errcode = pthread_mutex_lock(&tog_mutex);
3335 	if (errcode) {
3336 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3337 		return (void *)err;
3338 	}
3339 
3340 	err = block_signals_used_by_main_thread();
3341 	if (err) {
3342 		pthread_mutex_unlock(&tog_mutex);
3343 		goto done;
3344 	}
3345 
3346 	while (!done && !err && !tog_fatal_signal_received()) {
3347 		errcode = pthread_mutex_unlock(&tog_mutex);
3348 		if (errcode) {
3349 			err = got_error_set_errno(errcode,
3350 			    "pthread_mutex_unlock");
3351 			goto done;
3352 		}
3353 		err = queue_commits(a);
3354 		if (err) {
3355 			if (err->code != GOT_ERR_ITER_COMPLETED)
3356 				goto done;
3357 			err = NULL;
3358 			done = 1;
3359 			a->commits_needed = 0;
3360 		} else if (a->commits_needed > 0 && !a->load_all) {
3361 			if (*a->limiting) {
3362 				if (a->limit_match)
3363 					a->commits_needed--;
3364 			} else
3365 				a->commits_needed--;
3366 		}
3367 
3368 		errcode = pthread_mutex_lock(&tog_mutex);
3369 		if (errcode) {
3370 			err = got_error_set_errno(errcode,
3371 			    "pthread_mutex_lock");
3372 			goto done;
3373 		} else if (*a->quit)
3374 			done = 1;
3375 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3376 			*a->first_displayed_entry =
3377 			    TAILQ_FIRST(&a->limit_commits->head);
3378 			*a->selected_entry = *a->first_displayed_entry;
3379 		} else if (*a->first_displayed_entry == NULL) {
3380 			*a->first_displayed_entry =
3381 			    TAILQ_FIRST(&a->real_commits->head);
3382 			*a->selected_entry = *a->first_displayed_entry;
3383 		}
3384 
3385 		errcode = pthread_cond_signal(&a->commit_loaded);
3386 		if (errcode) {
3387 			err = got_error_set_errno(errcode,
3388 			    "pthread_cond_signal");
3389 			pthread_mutex_unlock(&tog_mutex);
3390 			goto done;
3391 		}
3392 
3393 		if (a->commits_needed == 0 &&
3394 		    a->need_commit_marker && a->worktree) {
3395 			errcode = pthread_mutex_unlock(&tog_mutex);
3396 			if (errcode) {
3397 				err = got_error_set_errno(errcode,
3398 				    "pthread_mutex_unlock");
3399 				goto done;
3400 			}
3401 			err = got_worktree_get_state(&tog_base_commit.marker,
3402 			    a->repo, a->worktree, NULL, NULL);
3403 			if (err)
3404 				goto done;
3405 			errcode = pthread_mutex_lock(&tog_mutex);
3406 			if (errcode) {
3407 				err = got_error_set_errno(errcode,
3408 				    "pthread_mutex_lock");
3409 				goto done;
3410 			}
3411 			a->need_commit_marker = 0;
3412 			/*
3413 			 * The main thread did not close this
3414 			 * work tree yet. Close it now.
3415 			 */
3416 			got_worktree_close(a->worktree);
3417 			a->worktree = NULL;
3418 
3419 			if (*a->quit)
3420 				done = 1;
3421 		}
3422 
3423 		if (done)
3424 			a->commits_needed = 0;
3425 		else {
3426 			if (a->commits_needed == 0 && !a->load_all) {
3427 				if (tog_io.wait_for_ui) {
3428 					errcode = pthread_cond_signal(
3429 					    &a->log_loaded);
3430 					if (errcode && err == NULL)
3431 						err = got_error_set_errno(
3432 						    errcode,
3433 						    "pthread_cond_signal");
3434 				}
3435 
3436 				errcode = pthread_cond_wait(&a->need_commits,
3437 				    &tog_mutex);
3438 				if (errcode) {
3439 					err = got_error_set_errno(errcode,
3440 					    "pthread_cond_wait");
3441 					pthread_mutex_unlock(&tog_mutex);
3442 					goto done;
3443 				}
3444 				if (*a->quit)
3445 					done = 1;
3446 			}
3447 		}
3448 	}
3449 	a->log_complete = 1;
3450 	if (tog_io.wait_for_ui) {
3451 		errcode = pthread_cond_signal(&a->log_loaded);
3452 		if (errcode && err == NULL)
3453 			err = got_error_set_errno(errcode,
3454 			    "pthread_cond_signal");
3455 	}
3456 
3457 	errcode = pthread_mutex_unlock(&tog_mutex);
3458 	if (errcode)
3459 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3460 done:
3461 	if (err) {
3462 		tog_thread_error = 1;
3463 		pthread_cond_signal(&a->commit_loaded);
3464 		if (a->worktree) {
3465 			got_worktree_close(a->worktree);
3466 			a->worktree = NULL;
3467 		}
3468 	}
3469 	return (void *)err;
3470 }
3471 
3472 static const struct got_error *
3473 stop_log_thread(struct tog_log_view_state *s)
3474 {
3475 	const struct got_error *err = NULL, *thread_err = NULL;
3476 	int errcode;
3477 
3478 	if (s->thread) {
3479 		s->quit = 1;
3480 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3481 		if (errcode)
3482 			return got_error_set_errno(errcode,
3483 			    "pthread_cond_signal");
3484 		errcode = pthread_mutex_unlock(&tog_mutex);
3485 		if (errcode)
3486 			return got_error_set_errno(errcode,
3487 			    "pthread_mutex_unlock");
3488 		errcode = pthread_join(s->thread, (void **)&thread_err);
3489 		if (errcode)
3490 			return got_error_set_errno(errcode, "pthread_join");
3491 		errcode = pthread_mutex_lock(&tog_mutex);
3492 		if (errcode)
3493 			return got_error_set_errno(errcode,
3494 			    "pthread_mutex_lock");
3495 		s->thread = NULL;
3496 	}
3497 
3498 	if (s->thread_args.repo) {
3499 		err = got_repo_close(s->thread_args.repo);
3500 		s->thread_args.repo = NULL;
3501 	}
3502 
3503 	if (s->thread_args.pack_fds) {
3504 		const struct got_error *pack_err =
3505 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3506 		if (err == NULL)
3507 			err = pack_err;
3508 		s->thread_args.pack_fds = NULL;
3509 	}
3510 
3511 	if (s->thread_args.graph) {
3512 		got_commit_graph_close(s->thread_args.graph);
3513 		s->thread_args.graph = NULL;
3514 	}
3515 
3516 	return err ? err : thread_err;
3517 }
3518 
3519 static const struct got_error *
3520 close_log_view(struct tog_view *view)
3521 {
3522 	const struct got_error *err = NULL;
3523 	struct tog_log_view_state *s = &view->state.log;
3524 	int errcode;
3525 
3526 	err = stop_log_thread(s);
3527 
3528 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3529 	if (errcode && err == NULL)
3530 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3531 
3532 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3533 	if (errcode && err == NULL)
3534 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3535 
3536 	free_commits(&s->limit_commits);
3537 	free_commits(&s->real_commits);
3538 	free_colors(&s->colors);
3539 	free(s->in_repo_path);
3540 	s->in_repo_path = NULL;
3541 	free(s->start_id);
3542 	s->start_id = NULL;
3543 	free(s->head_ref_name);
3544 	s->head_ref_name = NULL;
3545 	return err;
3546 }
3547 
3548 /*
3549  * We use two queues to implement the limit feature: first consists of
3550  * commits matching the current limit_regex; second is the real queue
3551  * of all known commits (real_commits). When the user starts limiting,
3552  * we swap queues such that all movement and displaying functionality
3553  * works with very slight change.
3554  */
3555 static const struct got_error *
3556 limit_log_view(struct tog_view *view)
3557 {
3558 	struct tog_log_view_state *s = &view->state.log;
3559 	struct commit_queue_entry *entry;
3560 	struct tog_view	*v = view;
3561 	const struct got_error *err = NULL;
3562 	char pattern[1024];
3563 	int ret;
3564 
3565 	if (view_is_hsplit_top(view))
3566 		v = view->child;
3567 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3568 		v = view->parent;
3569 
3570 	if (tog_io.input_str != NULL) {
3571 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
3572 		    sizeof(pattern))
3573 			return got_error(GOT_ERR_NO_SPACE);
3574 	} else {
3575 		wmove(v->window, v->nlines - 1, 0);
3576 		wclrtoeol(v->window);
3577 		mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3578 		nodelay(v->window, FALSE);
3579 		nocbreak();
3580 		echo();
3581 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
3582 		cbreak();
3583 		noecho();
3584 		nodelay(v->window, TRUE);
3585 		if (ret == ERR)
3586 			return NULL;
3587 	}
3588 
3589 	if (*pattern == '\0') {
3590 		/*
3591 		 * Safety measure for the situation where the user
3592 		 * resets limit without previously limiting anything.
3593 		 */
3594 		if (!s->limit_view)
3595 			return NULL;
3596 
3597 		/*
3598 		 * User could have pressed Ctrl+L, which refreshed the
3599 		 * commit queues, it means we can't save previously
3600 		 * (before limit took place) displayed entries,
3601 		 * because they would point to already free'ed memory,
3602 		 * so we are forced to always select first entry of
3603 		 * the queue.
3604 		 */
3605 		s->commits = &s->real_commits;
3606 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3607 		s->selected_entry = s->first_displayed_entry;
3608 		s->selected = 0;
3609 		s->limit_view = 0;
3610 
3611 		return NULL;
3612 	}
3613 
3614 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3615 		return NULL;
3616 
3617 	s->limit_view = 1;
3618 
3619 	/* Clear the screen while loading limit view */
3620 	s->first_displayed_entry = NULL;
3621 	s->last_displayed_entry = NULL;
3622 	s->selected_entry = NULL;
3623 	s->commits = &s->limit_commits;
3624 
3625 	/* Prepare limit queue for new search */
3626 	free_commits(&s->limit_commits);
3627 	s->limit_commits.ncommits = 0;
3628 
3629 	/* First process commits, which are in queue already */
3630 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3631 		int have_match = 0;
3632 
3633 		err = match_commit(&have_match, entry->id,
3634 		    entry->commit, &s->limit_regex);
3635 		if (err)
3636 			return err;
3637 
3638 		if (have_match) {
3639 			struct commit_queue_entry *matched;
3640 
3641 			matched = alloc_commit_queue_entry(entry->commit,
3642 			    entry->id);
3643 			if (matched == NULL) {
3644 				err = got_error_from_errno(
3645 				    "alloc_commit_queue_entry");
3646 				break;
3647 			}
3648 			matched->commit = entry->commit;
3649 			got_object_commit_retain(entry->commit);
3650 
3651 			matched->idx = s->limit_commits.ncommits;
3652 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3653 			    matched, entry);
3654 			s->limit_commits.ncommits++;
3655 		}
3656 	}
3657 
3658 	/* Second process all the commits, until we fill the screen */
3659 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3660 	    !s->thread_args.log_complete) {
3661 		s->thread_args.commits_needed +=
3662 		    view->nlines - s->limit_commits.ncommits - 1;
3663 		err = trigger_log_thread(view, 1);
3664 		if (err)
3665 			return err;
3666 	}
3667 
3668 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3669 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3670 	s->selected = 0;
3671 
3672 	return NULL;
3673 }
3674 
3675 static const struct got_error *
3676 search_start_log_view(struct tog_view *view)
3677 {
3678 	struct tog_log_view_state *s = &view->state.log;
3679 
3680 	s->matched_entry = NULL;
3681 	s->search_entry = NULL;
3682 	return NULL;
3683 }
3684 
3685 static const struct got_error *
3686 search_next_log_view(struct tog_view *view)
3687 {
3688 	const struct got_error *err = NULL;
3689 	struct tog_log_view_state *s = &view->state.log;
3690 	struct commit_queue_entry *entry;
3691 
3692 	/* Display progress update in log view. */
3693 	show_log_view(view);
3694 	update_panels();
3695 	doupdate();
3696 
3697 	if (s->search_entry) {
3698 		if (!using_mock_io) {
3699 			int errcode, ch;
3700 
3701 			errcode = pthread_mutex_unlock(&tog_mutex);
3702 			if (errcode)
3703 				return got_error_set_errno(errcode,
3704 				    "pthread_mutex_unlock");
3705 			ch = wgetch(view->window);
3706 			errcode = pthread_mutex_lock(&tog_mutex);
3707 			if (errcode)
3708 				return got_error_set_errno(errcode,
3709 				    "pthread_mutex_lock");
3710 			if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3711 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3712 				return NULL;
3713 			}
3714 		}
3715 		if (view->searching == TOG_SEARCH_FORWARD)
3716 			entry = TAILQ_NEXT(s->search_entry, entry);
3717 		else
3718 			entry = TAILQ_PREV(s->search_entry,
3719 			    commit_queue_head, entry);
3720 	} else if (s->matched_entry) {
3721 		/*
3722 		 * If the user has moved the cursor after we hit a match,
3723 		 * the position from where we should continue searching
3724 		 * might have changed.
3725 		 */
3726 		if (view->searching == TOG_SEARCH_FORWARD)
3727 			entry = TAILQ_NEXT(s->selected_entry, entry);
3728 		else
3729 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3730 			    entry);
3731 	} else {
3732 		entry = s->selected_entry;
3733 	}
3734 
3735 	while (1) {
3736 		int have_match = 0;
3737 
3738 		if (entry == NULL) {
3739 			if (s->thread_args.log_complete ||
3740 			    view->searching == TOG_SEARCH_BACKWARD) {
3741 				view->search_next_done =
3742 				    (s->matched_entry == NULL ?
3743 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3744 				s->search_entry = NULL;
3745 				return NULL;
3746 			}
3747 			/*
3748 			 * Poke the log thread for more commits and return,
3749 			 * allowing the main loop to make progress. Search
3750 			 * will resume at s->search_entry once we come back.
3751 			 */
3752 			s->search_entry = s->selected_entry;
3753 			s->thread_args.commits_needed++;
3754 			return trigger_log_thread(view, 0);
3755 		}
3756 
3757 		err = match_commit(&have_match, entry->id, entry->commit,
3758 		    &view->regex);
3759 		if (err)
3760 			break;
3761 		if (have_match) {
3762 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3763 			s->matched_entry = entry;
3764 			break;
3765 		}
3766 
3767 		s->search_entry = entry;
3768 		if (view->searching == TOG_SEARCH_FORWARD)
3769 			entry = TAILQ_NEXT(entry, entry);
3770 		else
3771 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3772 	}
3773 
3774 	if (s->matched_entry) {
3775 		int cur = s->selected_entry->idx;
3776 		while (cur < s->matched_entry->idx) {
3777 			err = input_log_view(NULL, view, KEY_DOWN);
3778 			if (err)
3779 				return err;
3780 			cur++;
3781 		}
3782 		while (cur > s->matched_entry->idx) {
3783 			err = input_log_view(NULL, view, KEY_UP);
3784 			if (err)
3785 				return err;
3786 			cur--;
3787 		}
3788 	}
3789 
3790 	s->search_entry = NULL;
3791 
3792 	return NULL;
3793 }
3794 
3795 static const struct got_error *
3796 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3797     struct got_repository *repo, const char *head_ref_name,
3798     const char *in_repo_path, int log_branches,
3799     struct got_worktree *worktree)
3800 {
3801 	const struct got_error *err = NULL;
3802 	struct tog_log_view_state *s = &view->state.log;
3803 	struct got_repository *thread_repo = NULL;
3804 	struct got_commit_graph *thread_graph = NULL;
3805 	int errcode;
3806 
3807 	if (in_repo_path != s->in_repo_path) {
3808 		free(s->in_repo_path);
3809 		s->in_repo_path = strdup(in_repo_path);
3810 		if (s->in_repo_path == NULL) {
3811 			err = got_error_from_errno("strdup");
3812 			goto done;
3813 		}
3814 	}
3815 
3816 	/* The commit queue only contains commits being displayed. */
3817 	TAILQ_INIT(&s->real_commits.head);
3818 	s->real_commits.ncommits = 0;
3819 	s->commits = &s->real_commits;
3820 
3821 	TAILQ_INIT(&s->limit_commits.head);
3822 	s->limit_view = 0;
3823 	s->limit_commits.ncommits = 0;
3824 
3825 	s->repo = repo;
3826 	if (head_ref_name) {
3827 		s->head_ref_name = strdup(head_ref_name);
3828 		if (s->head_ref_name == NULL) {
3829 			err = got_error_from_errno("strdup");
3830 			goto done;
3831 		}
3832 	}
3833 	s->start_id = got_object_id_dup(start_id);
3834 	if (s->start_id == NULL) {
3835 		err = got_error_from_errno("got_object_id_dup");
3836 		goto done;
3837 	}
3838 	s->log_branches = log_branches;
3839 	s->use_committer = 1;
3840 
3841 	STAILQ_INIT(&s->colors);
3842 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3843 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3844 		    get_color_value("TOG_COLOR_COMMIT"));
3845 		if (err)
3846 			goto done;
3847 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3848 		    get_color_value("TOG_COLOR_AUTHOR"));
3849 		if (err)
3850 			goto done;
3851 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3852 		    get_color_value("TOG_COLOR_DATE"));
3853 		if (err)
3854 			goto done;
3855 	}
3856 
3857 	view->show = show_log_view;
3858 	view->input = input_log_view;
3859 	view->resize = resize_log_view;
3860 	view->close = close_log_view;
3861 	view->search_start = search_start_log_view;
3862 	view->search_next = search_next_log_view;
3863 
3864 	if (s->thread_args.pack_fds == NULL) {
3865 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3866 		if (err)
3867 			goto done;
3868 	}
3869 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3870 	    s->thread_args.pack_fds);
3871 	if (err)
3872 		goto done;
3873 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3874 	    !s->log_branches);
3875 	if (err)
3876 		goto done;
3877 	err = got_commit_graph_bfsort(thread_graph, s->start_id,
3878 	    s->repo, NULL, NULL);
3879 	if (err)
3880 		goto done;
3881 
3882 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3883 	if (errcode) {
3884 		err = got_error_set_errno(errcode, "pthread_cond_init");
3885 		goto done;
3886 	}
3887 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3888 	if (errcode) {
3889 		err = got_error_set_errno(errcode, "pthread_cond_init");
3890 		goto done;
3891 	}
3892 
3893 	if (using_mock_io) {
3894 		int rc;
3895 
3896 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3897 		if (rc)
3898 			return got_error_set_errno(rc, "pthread_cond_init");
3899 	}
3900 
3901 	s->thread_args.commits_needed = view->nlines;
3902 	s->thread_args.graph = thread_graph;
3903 	s->thread_args.real_commits = &s->real_commits;
3904 	s->thread_args.limit_commits = &s->limit_commits;
3905 	s->thread_args.in_repo_path = s->in_repo_path;
3906 	s->thread_args.start_id = s->start_id;
3907 	s->thread_args.repo = thread_repo;
3908 	s->thread_args.log_complete = 0;
3909 	s->thread_args.quit = &s->quit;
3910 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3911 	s->thread_args.selected_entry = &s->selected_entry;
3912 	s->thread_args.searching = &view->searching;
3913 	s->thread_args.search_next_done = &view->search_next_done;
3914 	s->thread_args.regex = &view->regex;
3915 	s->thread_args.limiting = &s->limit_view;
3916 	s->thread_args.limit_regex = &s->limit_regex;
3917 	s->thread_args.limit_commits = &s->limit_commits;
3918 	s->thread_args.worktree = worktree;
3919 	if (worktree)
3920 		s->thread_args.need_commit_marker = 1;
3921 done:
3922 	if (err) {
3923 		if (view->close == NULL)
3924 			close_log_view(view);
3925 		view_close(view);
3926 	}
3927 	return err;
3928 }
3929 
3930 static const struct got_error *
3931 show_log_view(struct tog_view *view)
3932 {
3933 	const struct got_error *err;
3934 	struct tog_log_view_state *s = &view->state.log;
3935 
3936 	if (s->thread == NULL) {
3937 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3938 		    &s->thread_args);
3939 		if (errcode)
3940 			return got_error_set_errno(errcode, "pthread_create");
3941 		if (s->thread_args.commits_needed > 0) {
3942 			err = trigger_log_thread(view, 1);
3943 			if (err)
3944 				return err;
3945 		}
3946 	}
3947 
3948 	return draw_commits(view);
3949 }
3950 
3951 static void
3952 log_move_cursor_up(struct tog_view *view, int page, int home)
3953 {
3954 	struct tog_log_view_state *s = &view->state.log;
3955 
3956 	if (s->first_displayed_entry == NULL)
3957 		return;
3958 	if (s->selected_entry->idx == 0)
3959 		view->count = 0;
3960 
3961 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3962 	    || home)
3963 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3964 
3965 	if (!page && !home && s->selected > 0)
3966 		--s->selected;
3967 	else
3968 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3969 
3970 	select_commit(s);
3971 	return;
3972 }
3973 
3974 static const struct got_error *
3975 log_move_cursor_down(struct tog_view *view, int page)
3976 {
3977 	struct tog_log_view_state	*s = &view->state.log;
3978 	const struct got_error		*err = NULL;
3979 	int				 eos = view->nlines - 2;
3980 
3981 	if (s->first_displayed_entry == NULL)
3982 		return NULL;
3983 
3984 	if (s->thread_args.log_complete &&
3985 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3986 		return NULL;
3987 
3988 	if (view_is_hsplit_top(view))
3989 		--eos;  /* border consumes the last line */
3990 
3991 	if (!page) {
3992 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3993 			++s->selected;
3994 		else
3995 			err = log_scroll_down(view, 1);
3996 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3997 		struct commit_queue_entry *entry;
3998 		int n;
3999 
4000 		s->selected = 0;
4001 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
4002 		s->last_displayed_entry = entry;
4003 		for (n = 0; n <= eos; n++) {
4004 			if (entry == NULL)
4005 				break;
4006 			s->first_displayed_entry = entry;
4007 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
4008 		}
4009 		if (n > 0)
4010 			s->selected = n - 1;
4011 	} else {
4012 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
4013 		    s->thread_args.log_complete)
4014 			s->selected += MIN(page,
4015 			    s->commits->ncommits - s->selected_entry->idx - 1);
4016 		else
4017 			err = log_scroll_down(view, page);
4018 	}
4019 	if (err)
4020 		return err;
4021 
4022 	/*
4023 	 * We might necessarily overshoot in horizontal
4024 	 * splits; if so, select the last displayed commit.
4025 	 */
4026 	if (s->first_displayed_entry && s->last_displayed_entry) {
4027 		s->selected = MIN(s->selected,
4028 		    s->last_displayed_entry->idx -
4029 		    s->first_displayed_entry->idx);
4030 	}
4031 
4032 	select_commit(s);
4033 
4034 	if (s->thread_args.log_complete &&
4035 	    s->selected_entry->idx == s->commits->ncommits - 1)
4036 		view->count = 0;
4037 
4038 	return NULL;
4039 }
4040 
4041 static void
4042 view_get_split(struct tog_view *view, int *y, int *x)
4043 {
4044 	*x = 0;
4045 	*y = 0;
4046 
4047 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4048 		if (view->child && view->child->resized_y)
4049 			*y = view->child->resized_y;
4050 		else if (view->resized_y)
4051 			*y = view->resized_y;
4052 		else
4053 			*y = view_split_begin_y(view->lines);
4054 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4055 		if (view->child && view->child->resized_x)
4056 			*x = view->child->resized_x;
4057 		else if (view->resized_x)
4058 			*x = view->resized_x;
4059 		else
4060 			*x = view_split_begin_x(view->begin_x);
4061 	}
4062 }
4063 
4064 /* Split view horizontally at y and offset view->state->selected line. */
4065 static const struct got_error *
4066 view_init_hsplit(struct tog_view *view, int y)
4067 {
4068 	const struct got_error *err = NULL;
4069 
4070 	view->nlines = y;
4071 	view->ncols = COLS;
4072 	err = view_resize(view);
4073 	if (err)
4074 		return err;
4075 
4076 	err = offset_selection_down(view);
4077 
4078 	return err;
4079 }
4080 
4081 static const struct got_error *
4082 log_goto_line(struct tog_view *view, int nlines)
4083 {
4084 	const struct got_error		*err = NULL;
4085 	struct tog_log_view_state	*s = &view->state.log;
4086 	int				 g, idx = s->selected_entry->idx;
4087 
4088 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4089 		return NULL;
4090 
4091 	g = view->gline;
4092 	view->gline = 0;
4093 
4094 	if (g >= s->first_displayed_entry->idx + 1 &&
4095 	    g <= s->last_displayed_entry->idx + 1 &&
4096 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4097 		s->selected = g - s->first_displayed_entry->idx - 1;
4098 		select_commit(s);
4099 		return NULL;
4100 	}
4101 
4102 	if (idx + 1 < g) {
4103 		err = log_move_cursor_down(view, g - idx - 1);
4104 		if (!err && g > s->selected_entry->idx + 1)
4105 			err = log_move_cursor_down(view,
4106 			    g - s->first_displayed_entry->idx - 1);
4107 		if (err)
4108 			return err;
4109 	} else if (idx + 1 > g)
4110 		log_move_cursor_up(view, idx - g + 1, 0);
4111 
4112 	if (g < nlines && s->first_displayed_entry->idx == 0)
4113 		s->selected = g - 1;
4114 
4115 	select_commit(s);
4116 	return NULL;
4117 
4118 }
4119 
4120 static void
4121 horizontal_scroll_input(struct tog_view *view, int ch)
4122 {
4123 
4124 	switch (ch) {
4125 	case KEY_LEFT:
4126 	case 'h':
4127 		view->x -= MIN(view->x, 2);
4128 		if (view->x <= 0)
4129 			view->count = 0;
4130 		break;
4131 	case KEY_RIGHT:
4132 	case 'l':
4133 		if (view->x + view->ncols / 2 < view->maxx)
4134 			view->x += 2;
4135 		else
4136 			view->count = 0;
4137 		break;
4138 	case '0':
4139 		view->x = 0;
4140 		break;
4141 	case '$':
4142 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4143 		view->count = 0;
4144 		break;
4145 	default:
4146 		break;
4147 	}
4148 }
4149 
4150 static const struct got_error *
4151 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4152 {
4153 	const struct got_error *err = NULL;
4154 	struct tog_log_view_state *s = &view->state.log;
4155 	int eos, nscroll;
4156 
4157 	if (s->thread_args.load_all) {
4158 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4159 			s->thread_args.load_all = 0;
4160 		else if (s->thread_args.log_complete) {
4161 			err = log_move_cursor_down(view, s->commits->ncommits);
4162 			s->thread_args.load_all = 0;
4163 		}
4164 		if (err)
4165 			return err;
4166 	}
4167 
4168 	eos = nscroll = view->nlines - 1;
4169 	if (view_is_hsplit_top(view))
4170 		--eos;  /* border */
4171 
4172 	if (view->gline)
4173 		return log_goto_line(view, eos);
4174 
4175 	switch (ch) {
4176 	case '&':
4177 		err = limit_log_view(view);
4178 		break;
4179 	case 'q':
4180 		s->quit = 1;
4181 		break;
4182 	case '0':
4183 	case '$':
4184 	case KEY_RIGHT:
4185 	case 'l':
4186 	case KEY_LEFT:
4187 	case 'h':
4188 		horizontal_scroll_input(view, ch);
4189 		break;
4190 	case 'k':
4191 	case KEY_UP:
4192 	case '<':
4193 	case ',':
4194 	case CTRL('p'):
4195 		log_move_cursor_up(view, 0, 0);
4196 		break;
4197 	case 'g':
4198 	case '=':
4199 	case KEY_HOME:
4200 		log_move_cursor_up(view, 0, 1);
4201 		view->count = 0;
4202 		break;
4203 	case CTRL('u'):
4204 	case 'u':
4205 		nscroll /= 2;
4206 		/* FALL THROUGH */
4207 	case KEY_PPAGE:
4208 	case CTRL('b'):
4209 	case 'b':
4210 		log_move_cursor_up(view, nscroll, 0);
4211 		break;
4212 	case 'j':
4213 	case KEY_DOWN:
4214 	case '>':
4215 	case '.':
4216 	case CTRL('n'):
4217 		err = log_move_cursor_down(view, 0);
4218 		break;
4219 	case '@':
4220 		s->use_committer = !s->use_committer;
4221 		view->action = s->use_committer ?
4222 		    "show committer" : "show commit author";
4223 		break;
4224 	case 'G':
4225 	case '*':
4226 	case KEY_END: {
4227 		/* We don't know yet how many commits, so we're forced to
4228 		 * traverse them all. */
4229 		view->count = 0;
4230 		s->thread_args.load_all = 1;
4231 		if (!s->thread_args.log_complete)
4232 			return trigger_log_thread(view, 0);
4233 		err = log_move_cursor_down(view, s->commits->ncommits);
4234 		s->thread_args.load_all = 0;
4235 		break;
4236 	}
4237 	case CTRL('d'):
4238 	case 'd':
4239 		nscroll /= 2;
4240 		/* FALL THROUGH */
4241 	case KEY_NPAGE:
4242 	case CTRL('f'):
4243 	case 'f':
4244 	case ' ':
4245 		err = log_move_cursor_down(view, nscroll);
4246 		break;
4247 	case KEY_RESIZE:
4248 		if (s->selected > view->nlines - 2)
4249 			s->selected = view->nlines - 2;
4250 		if (s->selected > s->commits->ncommits - 1)
4251 			s->selected = s->commits->ncommits - 1;
4252 		select_commit(s);
4253 		if (s->commits->ncommits < view->nlines - 1 &&
4254 		    !s->thread_args.log_complete) {
4255 			s->thread_args.commits_needed += (view->nlines - 1) -
4256 			    s->commits->ncommits;
4257 			err = trigger_log_thread(view, 1);
4258 		}
4259 		break;
4260 	case KEY_ENTER:
4261 	case '\r':
4262 		view->count = 0;
4263 		if (s->selected_entry == NULL)
4264 			break;
4265 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4266 		break;
4267 	case 'T':
4268 		view->count = 0;
4269 		if (s->selected_entry == NULL)
4270 			break;
4271 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4272 		break;
4273 	case KEY_BACKSPACE:
4274 	case CTRL('l'):
4275 	case 'B':
4276 		view->count = 0;
4277 		if (ch == KEY_BACKSPACE &&
4278 		    got_path_is_root_dir(s->in_repo_path))
4279 			break;
4280 		err = stop_log_thread(s);
4281 		if (err)
4282 			return err;
4283 		if (ch == KEY_BACKSPACE) {
4284 			char *parent_path;
4285 			err = got_path_dirname(&parent_path, s->in_repo_path);
4286 			if (err)
4287 				return err;
4288 			free(s->in_repo_path);
4289 			s->in_repo_path = parent_path;
4290 			s->thread_args.in_repo_path = s->in_repo_path;
4291 		} else if (ch == CTRL('l')) {
4292 			struct got_object_id *start_id;
4293 			err = got_repo_match_object_id(&start_id, NULL,
4294 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4295 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4296 			if (err) {
4297 				if (s->head_ref_name == NULL ||
4298 				    err->code != GOT_ERR_NOT_REF)
4299 					return err;
4300 				/* Try to cope with deleted references. */
4301 				free(s->head_ref_name);
4302 				s->head_ref_name = NULL;
4303 				err = got_repo_match_object_id(&start_id,
4304 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4305 				    &tog_refs, s->repo);
4306 				if (err)
4307 					return err;
4308 			}
4309 			free(s->start_id);
4310 			s->start_id = start_id;
4311 			s->thread_args.start_id = s->start_id;
4312 		} else /* 'B' */
4313 			s->log_branches = !s->log_branches;
4314 
4315 		if (s->thread_args.pack_fds == NULL) {
4316 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4317 			if (err)
4318 				return err;
4319 		}
4320 		err = got_repo_open(&s->thread_args.repo,
4321 		    got_repo_get_path(s->repo), NULL,
4322 		    s->thread_args.pack_fds);
4323 		if (err)
4324 			return err;
4325 		tog_free_refs();
4326 		err = tog_load_refs(s->repo, 0);
4327 		if (err)
4328 			return err;
4329 		err = got_commit_graph_open(&s->thread_args.graph,
4330 		    s->in_repo_path, !s->log_branches);
4331 		if (err)
4332 			return err;
4333 		err = got_commit_graph_bfsort(s->thread_args.graph,
4334 		    s->start_id, s->repo, NULL, NULL);
4335 		if (err)
4336 			return err;
4337 		free_commits(&s->real_commits);
4338 		free_commits(&s->limit_commits);
4339 		s->first_displayed_entry = NULL;
4340 		s->last_displayed_entry = NULL;
4341 		s->selected_entry = NULL;
4342 		s->selected = 0;
4343 		s->thread_args.log_complete = 0;
4344 		s->quit = 0;
4345 		s->thread_args.commits_needed = view->lines;
4346 		s->matched_entry = NULL;
4347 		s->search_entry = NULL;
4348 		view->offset = 0;
4349 		break;
4350 	case 'R':
4351 		view->count = 0;
4352 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4353 		break;
4354 	default:
4355 		view->count = 0;
4356 		break;
4357 	}
4358 
4359 	return err;
4360 }
4361 
4362 static const struct got_error *
4363 apply_unveil(const char *repo_path, const char *worktree_path)
4364 {
4365 	const struct got_error *error;
4366 
4367 #ifdef PROFILE
4368 	if (unveil("gmon.out", "rwc") != 0)
4369 		return got_error_from_errno2("unveil", "gmon.out");
4370 #endif
4371 	if (repo_path && unveil(repo_path, "r") != 0)
4372 		return got_error_from_errno2("unveil", repo_path);
4373 
4374 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4375 		return got_error_from_errno2("unveil", worktree_path);
4376 
4377 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4378 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4379 
4380 	error = got_privsep_unveil_exec_helpers();
4381 	if (error != NULL)
4382 		return error;
4383 
4384 	if (unveil(NULL, NULL) != 0)
4385 		return got_error_from_errno("unveil");
4386 
4387 	return NULL;
4388 }
4389 
4390 static const struct got_error *
4391 init_mock_term(const char *test_script_path)
4392 {
4393 	const struct got_error	*err = NULL;
4394 	const char *screen_dump_path;
4395 	int in;
4396 
4397 	if (test_script_path == NULL || *test_script_path == '\0')
4398 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4399 
4400 	tog_io.f = fopen(test_script_path, "re");
4401 	if (tog_io.f == NULL) {
4402 		err = got_error_from_errno_fmt("fopen: %s",
4403 		    test_script_path);
4404 		goto done;
4405 	}
4406 
4407 	/* test mode, we don't want any output */
4408 	tog_io.cout = fopen("/dev/null", "w+");
4409 	if (tog_io.cout == NULL) {
4410 		err = got_error_from_errno2("fopen", "/dev/null");
4411 		goto done;
4412 	}
4413 
4414 	in = dup(fileno(tog_io.cout));
4415 	if (in == -1) {
4416 		err = got_error_from_errno("dup");
4417 		goto done;
4418 	}
4419 	tog_io.cin = fdopen(in, "r");
4420 	if (tog_io.cin == NULL) {
4421 		err = got_error_from_errno("fdopen");
4422 		close(in);
4423 		goto done;
4424 	}
4425 
4426 	screen_dump_path = getenv("TOG_SCR_DUMP");
4427 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4428 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4429 	tog_io.sdump = fopen(screen_dump_path, "we");
4430 	if (tog_io.sdump == NULL) {
4431 		err = got_error_from_errno2("fopen", screen_dump_path);
4432 		goto done;
4433 	}
4434 
4435 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4436 		err = got_error_from_errno("fseeko");
4437 		goto done;
4438 	}
4439 
4440 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4441 		err = got_error_msg(GOT_ERR_IO,
4442 		    "newterm: failed to initialise curses");
4443 
4444 	using_mock_io = 1;
4445 
4446 done:
4447 	if (err)
4448 		tog_io_close();
4449 	return err;
4450 }
4451 
4452 static void
4453 init_curses(void)
4454 {
4455 	if (using_mock_io) /* In test mode we use a fake terminal */
4456 		return;
4457 
4458 	initscr();
4459 
4460 	cbreak();
4461 	halfdelay(1); /* Fast refresh while initial view is loading. */
4462 	noecho();
4463 	nonl();
4464 	intrflush(stdscr, FALSE);
4465 	keypad(stdscr, TRUE);
4466 	curs_set(0);
4467 	if (getenv("TOG_COLORS") != NULL) {
4468 		start_color();
4469 		use_default_colors();
4470 	}
4471 
4472 	return;
4473 }
4474 
4475 static const struct got_error *
4476 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4477 {
4478 	tog_base_commit.id = got_object_id_dup(
4479 	    got_worktree_get_base_commit_id(worktree));
4480 	if (tog_base_commit.id == NULL)
4481 		return got_error_from_errno( "got_object_id_dup");
4482 
4483 	return NULL;
4484 }
4485 
4486 static const struct got_error *
4487 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4488     struct got_repository *repo, struct got_worktree *worktree)
4489 {
4490 	const struct got_error *err = NULL;
4491 
4492 	if (argc == 0) {
4493 		*in_repo_path = strdup("/");
4494 		if (*in_repo_path == NULL)
4495 			return got_error_from_errno("strdup");
4496 		return NULL;
4497 	}
4498 
4499 	if (worktree) {
4500 		const char *prefix = got_worktree_get_path_prefix(worktree);
4501 		char *p;
4502 
4503 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4504 		if (err)
4505 			return err;
4506 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4507 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4508 		    p) == -1) {
4509 			err = got_error_from_errno("asprintf");
4510 			*in_repo_path = NULL;
4511 		}
4512 		free(p);
4513 	} else
4514 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4515 
4516 	return err;
4517 }
4518 
4519 static const struct got_error *
4520 cmd_log(int argc, char *argv[])
4521 {
4522 	const struct got_error *error;
4523 	struct got_repository *repo = NULL;
4524 	struct got_worktree *worktree = NULL;
4525 	struct got_object_id *start_id = NULL;
4526 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4527 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4528 	struct got_reference *ref = NULL;
4529 	const char *head_ref_name = NULL;
4530 	int ch, log_branches = 0;
4531 	struct tog_view *view;
4532 	int *pack_fds = NULL;
4533 
4534 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4535 		switch (ch) {
4536 		case 'b':
4537 			log_branches = 1;
4538 			break;
4539 		case 'c':
4540 			start_commit = optarg;
4541 			break;
4542 		case 'r':
4543 			repo_path = realpath(optarg, NULL);
4544 			if (repo_path == NULL)
4545 				return got_error_from_errno2("realpath",
4546 				    optarg);
4547 			break;
4548 		default:
4549 			usage_log();
4550 			/* NOTREACHED */
4551 		}
4552 	}
4553 
4554 	argc -= optind;
4555 	argv += optind;
4556 
4557 	if (argc > 1)
4558 		usage_log();
4559 
4560 	error = got_repo_pack_fds_open(&pack_fds);
4561 	if (error != NULL)
4562 		goto done;
4563 
4564 	if (repo_path == NULL) {
4565 		cwd = getcwd(NULL, 0);
4566 		if (cwd == NULL) {
4567 			error = got_error_from_errno("getcwd");
4568 			goto done;
4569 		}
4570 		error = got_worktree_open(&worktree, cwd, NULL);
4571 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4572 			goto done;
4573 		if (worktree)
4574 			repo_path =
4575 			    strdup(got_worktree_get_repo_path(worktree));
4576 		else
4577 			repo_path = strdup(cwd);
4578 		if (repo_path == NULL) {
4579 			error = got_error_from_errno("strdup");
4580 			goto done;
4581 		}
4582 	}
4583 
4584 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4585 	if (error != NULL)
4586 		goto done;
4587 
4588 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4589 	    repo, worktree);
4590 	if (error)
4591 		goto done;
4592 
4593 	init_curses();
4594 
4595 	error = apply_unveil(got_repo_get_path(repo),
4596 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4597 	if (error)
4598 		goto done;
4599 
4600 	/* already loaded by tog_log_with_path()? */
4601 	if (TAILQ_EMPTY(&tog_refs)) {
4602 		error = tog_load_refs(repo, 0);
4603 		if (error)
4604 			goto done;
4605 	}
4606 
4607 	if (start_commit == NULL) {
4608 		error = got_repo_match_object_id(&start_id, &label,
4609 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4610 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4611 		if (error)
4612 			goto done;
4613 		head_ref_name = label;
4614 	} else {
4615 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4616 		    repo, worktree);
4617 		if (error != NULL)
4618 			goto done;
4619 		if (keyword_idstr != NULL)
4620 			start_commit = keyword_idstr;
4621 
4622 		error = got_ref_open(&ref, repo, start_commit, 0);
4623 		if (error == NULL)
4624 			head_ref_name = got_ref_get_name(ref);
4625 		else if (error->code != GOT_ERR_NOT_REF)
4626 			goto done;
4627 		error = got_repo_match_object_id(&start_id, NULL,
4628 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4629 		if (error)
4630 			goto done;
4631 	}
4632 
4633 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4634 	if (view == NULL) {
4635 		error = got_error_from_errno("view_open");
4636 		goto done;
4637 	}
4638 
4639 	if (worktree) {
4640 		error = set_tog_base_commit(repo, worktree);
4641 		if (error != NULL)
4642 			goto done;
4643 	}
4644 
4645 	error = open_log_view(view, start_id, repo, head_ref_name,
4646 	    in_repo_path, log_branches, worktree);
4647 	if (error)
4648 		goto done;
4649 
4650 	if (worktree) {
4651 		/* The work tree will be closed by the log thread. */
4652 		worktree = NULL;
4653 	}
4654 
4655 	error = view_loop(view);
4656 
4657 done:
4658 	free(tog_base_commit.id);
4659 	free(keyword_idstr);
4660 	free(in_repo_path);
4661 	free(repo_path);
4662 	free(cwd);
4663 	free(start_id);
4664 	free(label);
4665 	if (ref)
4666 		got_ref_close(ref);
4667 	if (repo) {
4668 		const struct got_error *close_err = got_repo_close(repo);
4669 		if (error == NULL)
4670 			error = close_err;
4671 	}
4672 	if (worktree)
4673 		got_worktree_close(worktree);
4674 	if (pack_fds) {
4675 		const struct got_error *pack_err =
4676 		    got_repo_pack_fds_close(pack_fds);
4677 		if (error == NULL)
4678 			error = pack_err;
4679 	}
4680 	tog_free_refs();
4681 	return error;
4682 }
4683 
4684 __dead static void
4685 usage_diff(void)
4686 {
4687 	endwin();
4688 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4689 	    "object1 object2\n", getprogname());
4690 	exit(1);
4691 }
4692 
4693 static int
4694 match_line(const char *line, regex_t *regex, size_t nmatch,
4695     regmatch_t *regmatch)
4696 {
4697 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4698 }
4699 
4700 static struct tog_color *
4701 match_color(struct tog_colors *colors, const char *line)
4702 {
4703 	struct tog_color *tc = NULL;
4704 
4705 	STAILQ_FOREACH(tc, colors, entry) {
4706 		if (match_line(line, &tc->regex, 0, NULL))
4707 			return tc;
4708 	}
4709 
4710 	return NULL;
4711 }
4712 
4713 static const struct got_error *
4714 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4715     WINDOW *window, int skipcol, regmatch_t *regmatch)
4716 {
4717 	const struct got_error *err = NULL;
4718 	char *exstr = NULL;
4719 	wchar_t *wline = NULL;
4720 	int rme, rms, n, width, scrollx;
4721 	int width0 = 0, width1 = 0, width2 = 0;
4722 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4723 
4724 	*wtotal = 0;
4725 
4726 	rms = regmatch->rm_so;
4727 	rme = regmatch->rm_eo;
4728 
4729 	err = expand_tab(&exstr, line);
4730 	if (err)
4731 		return err;
4732 
4733 	/* Split the line into 3 segments, according to match offsets. */
4734 	seg0 = strndup(exstr, rms);
4735 	if (seg0 == NULL) {
4736 		err = got_error_from_errno("strndup");
4737 		goto done;
4738 	}
4739 	seg1 = strndup(exstr + rms, rme - rms);
4740 	if (seg1 == NULL) {
4741 		err = got_error_from_errno("strndup");
4742 		goto done;
4743 	}
4744 	seg2 = strdup(exstr + rme);
4745 	if (seg2 == NULL) {
4746 		err = got_error_from_errno("strndup");
4747 		goto done;
4748 	}
4749 
4750 	/* draw up to matched token if we haven't scrolled past it */
4751 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4752 	    col_tab_align, 1);
4753 	if (err)
4754 		goto done;
4755 	n = MAX(width0 - skipcol, 0);
4756 	if (n) {
4757 		free(wline);
4758 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4759 		    wlimit, col_tab_align, 1);
4760 		if (err)
4761 			goto done;
4762 		waddwstr(window, &wline[scrollx]);
4763 		wlimit -= width;
4764 		*wtotal += width;
4765 	}
4766 
4767 	if (wlimit > 0) {
4768 		int i = 0, w = 0;
4769 		size_t wlen;
4770 
4771 		free(wline);
4772 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4773 		    col_tab_align, 1);
4774 		if (err)
4775 			goto done;
4776 		wlen = wcslen(wline);
4777 		while (i < wlen) {
4778 			width = wcwidth(wline[i]);
4779 			if (width == -1) {
4780 				/* should not happen, tabs are expanded */
4781 				err = got_error(GOT_ERR_RANGE);
4782 				goto done;
4783 			}
4784 			if (width0 + w + width > skipcol)
4785 				break;
4786 			w += width;
4787 			i++;
4788 		}
4789 		/* draw (visible part of) matched token (if scrolled into it) */
4790 		if (width1 - w > 0) {
4791 			wattron(window, A_STANDOUT);
4792 			waddwstr(window, &wline[i]);
4793 			wattroff(window, A_STANDOUT);
4794 			wlimit -= (width1 - w);
4795 			*wtotal += (width1 - w);
4796 		}
4797 	}
4798 
4799 	if (wlimit > 0) {  /* draw rest of line */
4800 		free(wline);
4801 		if (skipcol > width0 + width1) {
4802 			err = format_line(&wline, &width2, &scrollx, seg2,
4803 			    skipcol - (width0 + width1), wlimit,
4804 			    col_tab_align, 1);
4805 			if (err)
4806 				goto done;
4807 			waddwstr(window, &wline[scrollx]);
4808 		} else {
4809 			err = format_line(&wline, &width2, NULL, seg2, 0,
4810 			    wlimit, col_tab_align, 1);
4811 			if (err)
4812 				goto done;
4813 			waddwstr(window, wline);
4814 		}
4815 		*wtotal += width2;
4816 	}
4817 done:
4818 	free(wline);
4819 	free(exstr);
4820 	free(seg0);
4821 	free(seg1);
4822 	free(seg2);
4823 	return err;
4824 }
4825 
4826 static int
4827 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4828 {
4829 	FILE	*f = NULL;
4830 	int	*eof, *first, *selected;
4831 
4832 	if (view->type == TOG_VIEW_DIFF) {
4833 		struct tog_diff_view_state *s = &view->state.diff;
4834 
4835 		first = &s->first_displayed_line;
4836 		selected = first;
4837 		eof = &s->eof;
4838 		f = s->f;
4839 	} else if (view->type == TOG_VIEW_HELP) {
4840 		struct tog_help_view_state *s = &view->state.help;
4841 
4842 		first = &s->first_displayed_line;
4843 		selected = first;
4844 		eof = &s->eof;
4845 		f = s->f;
4846 	} else if (view->type == TOG_VIEW_BLAME) {
4847 		struct tog_blame_view_state *s = &view->state.blame;
4848 
4849 		first = &s->first_displayed_line;
4850 		selected = &s->selected_line;
4851 		eof = &s->eof;
4852 		f = s->blame.f;
4853 	} else
4854 		return 0;
4855 
4856 	/* Center gline in the middle of the page like vi(1). */
4857 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4858 		return 0;
4859 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4860 		rewind(f);
4861 		*eof = 0;
4862 		*first = 1;
4863 		*lineno = 0;
4864 		*nprinted = 0;
4865 		return 0;
4866 	}
4867 
4868 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4869 		view->gline : (view->nlines - 3) / 2 + 1;
4870 	view->gline = 0;
4871 
4872 	return 1;
4873 }
4874 
4875 static const struct got_error *
4876 draw_file(struct tog_view *view, const char *header)
4877 {
4878 	struct tog_diff_view_state *s = &view->state.diff;
4879 	regmatch_t *regmatch = &view->regmatch;
4880 	const struct got_error *err;
4881 	int nprinted = 0;
4882 	char *line;
4883 	size_t linesize = 0;
4884 	ssize_t linelen;
4885 	wchar_t *wline;
4886 	int width;
4887 	int max_lines = view->nlines;
4888 	int nlines = s->nlines;
4889 	off_t line_offset;
4890 
4891 	s->lineno = s->first_displayed_line - 1;
4892 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4893 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4894 		return got_error_from_errno("fseek");
4895 
4896 	werase(view->window);
4897 
4898 	if (view->gline > s->nlines - 1)
4899 		view->gline = s->nlines - 1;
4900 
4901 	if (header) {
4902 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4903 		    1 : view->gline - (view->nlines - 3) / 2 :
4904 		    s->lineno + s->selected_line;
4905 
4906 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4907 			return got_error_from_errno("asprintf");
4908 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4909 		    0, 0);
4910 		free(line);
4911 		if (err)
4912 			return err;
4913 
4914 		if (view_needs_focus_indication(view))
4915 			wstandout(view->window);
4916 		waddwstr(view->window, wline);
4917 		free(wline);
4918 		wline = NULL;
4919 		while (width++ < view->ncols)
4920 			waddch(view->window, ' ');
4921 		if (view_needs_focus_indication(view))
4922 			wstandend(view->window);
4923 
4924 		if (max_lines <= 1)
4925 			return NULL;
4926 		max_lines--;
4927 	}
4928 
4929 	s->eof = 0;
4930 	view->maxx = 0;
4931 	line = NULL;
4932 	while (max_lines > 0 && nprinted < max_lines) {
4933 		enum got_diff_line_type linetype;
4934 		attr_t attr = 0;
4935 
4936 		linelen = getline(&line, &linesize, s->f);
4937 		if (linelen == -1) {
4938 			if (feof(s->f)) {
4939 				s->eof = 1;
4940 				break;
4941 			}
4942 			free(line);
4943 			return got_ferror(s->f, GOT_ERR_IO);
4944 		}
4945 
4946 		if (++s->lineno < s->first_displayed_line)
4947 			continue;
4948 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4949 			continue;
4950 		if (s->lineno == view->hiline)
4951 			attr = A_STANDOUT;
4952 
4953 		/* Set view->maxx based on full line length. */
4954 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4955 		    view->x ? 1 : 0);
4956 		if (err) {
4957 			free(line);
4958 			return err;
4959 		}
4960 		view->maxx = MAX(view->maxx, width);
4961 		free(wline);
4962 		wline = NULL;
4963 
4964 		linetype = s->lines[s->lineno].type;
4965 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4966 		    linetype < GOT_DIFF_LINE_CONTEXT)
4967 			attr |= COLOR_PAIR(linetype);
4968 		if (attr)
4969 			wattron(view->window, attr);
4970 		if (s->first_displayed_line + nprinted == s->matched_line &&
4971 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4972 			err = add_matched_line(&width, line, view->ncols, 0,
4973 			    view->window, view->x, regmatch);
4974 			if (err) {
4975 				free(line);
4976 				return err;
4977 			}
4978 		} else {
4979 			int skip;
4980 			err = format_line(&wline, &width, &skip, line,
4981 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4982 			if (err) {
4983 				free(line);
4984 				return err;
4985 			}
4986 			waddwstr(view->window, &wline[skip]);
4987 			free(wline);
4988 			wline = NULL;
4989 		}
4990 		if (s->lineno == view->hiline) {
4991 			/* highlight full gline length */
4992 			while (width++ < view->ncols)
4993 				waddch(view->window, ' ');
4994 		} else {
4995 			if (width <= view->ncols - 1)
4996 				waddch(view->window, '\n');
4997 		}
4998 		if (attr)
4999 			wattroff(view->window, attr);
5000 		if (++nprinted == 1)
5001 			s->first_displayed_line = s->lineno;
5002 	}
5003 	free(line);
5004 	if (nprinted >= 1)
5005 		s->last_displayed_line = s->first_displayed_line +
5006 		    (nprinted - 1);
5007 	else
5008 		s->last_displayed_line = s->first_displayed_line;
5009 
5010 	view_border(view);
5011 
5012 	if (s->eof) {
5013 		while (nprinted < view->nlines) {
5014 			waddch(view->window, '\n');
5015 			nprinted++;
5016 		}
5017 
5018 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5019 		    view->ncols, 0, 0);
5020 		if (err) {
5021 			return err;
5022 		}
5023 
5024 		wstandout(view->window);
5025 		waddwstr(view->window, wline);
5026 		free(wline);
5027 		wline = NULL;
5028 		wstandend(view->window);
5029 	}
5030 
5031 	return NULL;
5032 }
5033 
5034 static char *
5035 get_datestr(time_t *time, char *datebuf)
5036 {
5037 	struct tm mytm, *tm;
5038 	char *p, *s;
5039 
5040 	tm = gmtime_r(time, &mytm);
5041 	if (tm == NULL)
5042 		return NULL;
5043 	s = asctime_r(tm, datebuf);
5044 	if (s == NULL)
5045 		return NULL;
5046 	p = strchr(s, '\n');
5047 	if (p)
5048 		*p = '\0';
5049 	return s;
5050 }
5051 
5052 static const struct got_error *
5053 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5054     off_t off, uint8_t type)
5055 {
5056 	struct got_diff_line *p;
5057 
5058 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5059 	if (p == NULL)
5060 		return got_error_from_errno("reallocarray");
5061 	*lines = p;
5062 	(*lines)[*nlines].offset = off;
5063 	(*lines)[*nlines].type = type;
5064 	(*nlines)++;
5065 
5066 	return NULL;
5067 }
5068 
5069 static const struct got_error *
5070 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5071     struct got_diff_line *s_lines, size_t s_nlines)
5072 {
5073 	struct got_diff_line	*p;
5074 	char			 buf[BUFSIZ];
5075 	size_t			 i, r;
5076 
5077 	if (fseeko(src, 0L, SEEK_SET) == -1)
5078 		return got_error_from_errno("fseeko");
5079 
5080 	for (;;) {
5081 		r = fread(buf, 1, sizeof(buf), src);
5082 		if (r == 0) {
5083 			if (ferror(src))
5084 				return got_error_from_errno("fread");
5085 			if (feof(src))
5086 				break;
5087 		}
5088 		if (fwrite(buf, 1, r, dst) != r)
5089 			return got_ferror(dst, GOT_ERR_IO);
5090 	}
5091 
5092 	if (s_nlines == 0 && *d_nlines == 0)
5093 		return NULL;
5094 
5095 	/*
5096 	 * If commit info was in dst, increment line offsets
5097 	 * of the appended diff content, but skip s_lines[0]
5098 	 * because offset zero is already in *d_lines.
5099 	 */
5100 	if (*d_nlines > 0) {
5101 		for (i = 1; i < s_nlines; ++i)
5102 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5103 
5104 		if (s_nlines > 0) {
5105 			--s_nlines;
5106 			++s_lines;
5107 		}
5108 	}
5109 
5110 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5111 	if (p == NULL) {
5112 		/* d_lines is freed in close_diff_view() */
5113 		return got_error_from_errno("reallocarray");
5114 	}
5115 
5116 	*d_lines = p;
5117 
5118 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5119 	*d_nlines += s_nlines;
5120 
5121 	return NULL;
5122 }
5123 
5124 static const struct got_error *
5125 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5126     struct got_object_id *commit_id, struct got_reflist_head *refs,
5127     struct got_repository *repo, int ignore_ws, int force_text_diff,
5128     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5129 {
5130 	const struct got_error *err = NULL;
5131 	char datebuf[26], *datestr;
5132 	struct got_commit_object *commit;
5133 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5134 	time_t committer_time;
5135 	const char *author, *committer;
5136 	char *refs_str = NULL;
5137 	struct got_pathlist_entry *pe;
5138 	off_t outoff = 0;
5139 	int n;
5140 
5141 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5142 	if (err)
5143 		return err;
5144 
5145 	err = got_object_open_as_commit(&commit, repo, commit_id);
5146 	if (err)
5147 		return err;
5148 
5149 	err = got_object_id_str(&id_str, commit_id);
5150 	if (err) {
5151 		err = got_error_from_errno("got_object_id_str");
5152 		goto done;
5153 	}
5154 
5155 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5156 	if (err)
5157 		goto done;
5158 
5159 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5160 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5161 	if (n < 0) {
5162 		err = got_error_from_errno("fprintf");
5163 		goto done;
5164 	}
5165 	outoff += n;
5166 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5167 	if (err)
5168 		goto done;
5169 
5170 	n = fprintf(outfile, "from: %s\n",
5171 	    got_object_commit_get_author(commit));
5172 	if (n < 0) {
5173 		err = got_error_from_errno("fprintf");
5174 		goto done;
5175 	}
5176 	outoff += n;
5177 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5178 	if (err)
5179 		goto done;
5180 
5181 	author = got_object_commit_get_author(commit);
5182 	committer = got_object_commit_get_committer(commit);
5183 	if (strcmp(author, committer) != 0) {
5184 		n = fprintf(outfile, "via: %s\n", committer);
5185 		if (n < 0) {
5186 			err = got_error_from_errno("fprintf");
5187 			goto done;
5188 		}
5189 		outoff += n;
5190 		err = add_line_metadata(lines, nlines, outoff,
5191 		    GOT_DIFF_LINE_AUTHOR);
5192 		if (err)
5193 			goto done;
5194 	}
5195 	committer_time = got_object_commit_get_committer_time(commit);
5196 	datestr = get_datestr(&committer_time, datebuf);
5197 	if (datestr) {
5198 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5199 		if (n < 0) {
5200 			err = got_error_from_errno("fprintf");
5201 			goto done;
5202 		}
5203 		outoff += n;
5204 		err = add_line_metadata(lines, nlines, outoff,
5205 		    GOT_DIFF_LINE_DATE);
5206 		if (err)
5207 			goto done;
5208 	}
5209 	if (got_object_commit_get_nparents(commit) > 1) {
5210 		const struct got_object_id_queue *parent_ids;
5211 		struct got_object_qid *qid;
5212 		int pn = 1;
5213 		parent_ids = got_object_commit_get_parent_ids(commit);
5214 		STAILQ_FOREACH(qid, parent_ids, entry) {
5215 			err = got_object_id_str(&id_str, &qid->id);
5216 			if (err)
5217 				goto done;
5218 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5219 			if (n < 0) {
5220 				err = got_error_from_errno("fprintf");
5221 				goto done;
5222 			}
5223 			outoff += n;
5224 			err = add_line_metadata(lines, nlines, outoff,
5225 			    GOT_DIFF_LINE_META);
5226 			if (err)
5227 				goto done;
5228 			free(id_str);
5229 			id_str = NULL;
5230 		}
5231 	}
5232 
5233 	err = got_object_commit_get_logmsg(&logmsg, commit);
5234 	if (err)
5235 		goto done;
5236 	s = logmsg;
5237 	while ((line = strsep(&s, "\n")) != NULL) {
5238 		n = fprintf(outfile, "%s\n", line);
5239 		if (n < 0) {
5240 			err = got_error_from_errno("fprintf");
5241 			goto done;
5242 		}
5243 		outoff += n;
5244 		err = add_line_metadata(lines, nlines, outoff,
5245 		    GOT_DIFF_LINE_LOGMSG);
5246 		if (err)
5247 			goto done;
5248 	}
5249 
5250 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5251 		struct got_diff_changed_path *cp = pe->data;
5252 		int pad = dsa->max_path_len - pe->path_len + 1;
5253 
5254 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5255 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5256 		    dsa->rm_cols + 1, cp->rm);
5257 		if (n < 0) {
5258 			err = got_error_from_errno("fprintf");
5259 			goto done;
5260 		}
5261 		outoff += n;
5262 		err = add_line_metadata(lines, nlines, outoff,
5263 		    GOT_DIFF_LINE_CHANGES);
5264 		if (err)
5265 			goto done;
5266 	}
5267 
5268 	fputc('\n', outfile);
5269 	outoff++;
5270 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5271 	if (err)
5272 		goto done;
5273 
5274 	n = fprintf(outfile,
5275 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5276 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5277 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5278 	if (n < 0) {
5279 		err = got_error_from_errno("fprintf");
5280 		goto done;
5281 	}
5282 	outoff += n;
5283 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5284 	if (err)
5285 		goto done;
5286 
5287 	fputc('\n', outfile);
5288 	outoff++;
5289 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5290 done:
5291 	free(id_str);
5292 	free(logmsg);
5293 	free(refs_str);
5294 	got_object_commit_close(commit);
5295 	if (err) {
5296 		free(*lines);
5297 		*lines = NULL;
5298 		*nlines = 0;
5299 	}
5300 	return err;
5301 }
5302 
5303 static const struct got_error *
5304 create_diff(struct tog_diff_view_state *s)
5305 {
5306 	const struct got_error *err = NULL;
5307 	FILE *tmp_diff_file = NULL;
5308 	int obj_type;
5309 	struct got_diff_line *lines = NULL;
5310 	struct got_pathlist_head changed_paths;
5311 	struct got_commit_object *commit2 = NULL;
5312 
5313 	TAILQ_INIT(&changed_paths);
5314 
5315 	free(s->lines);
5316 	s->lines = malloc(sizeof(*s->lines));
5317 	if (s->lines == NULL)
5318 		return got_error_from_errno("malloc");
5319 	s->nlines = 0;
5320 
5321 	if (s->f && fclose(s->f) == EOF) {
5322 		s->f = NULL;
5323 		return got_error_from_errno("fclose");
5324 	}
5325 
5326 	s->f = got_opentemp();
5327 	if (s->f == NULL)
5328 		return got_error_from_errno("got_opentemp");
5329 
5330 	tmp_diff_file = got_opentemp();
5331 	if (tmp_diff_file == NULL)
5332 		return got_error_from_errno("got_opentemp");
5333 
5334 	if (s->id1)
5335 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5336 	else
5337 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5338 	if (err)
5339 		goto done;
5340 
5341 	switch (obj_type) {
5342 	case GOT_OBJ_TYPE_BLOB:
5343 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5344 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5345 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5346 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5347 		    s->f);
5348 		break;
5349 	case GOT_OBJ_TYPE_TREE:
5350 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5351 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5352 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5353 		    s->force_text_diff, NULL, s->repo, s->f);
5354 		break;
5355 	case GOT_OBJ_TYPE_COMMIT: {
5356 		const struct got_object_id_queue *parent_ids;
5357 		struct got_object_qid *pid;
5358 		struct got_reflist_head *refs;
5359 		size_t nlines = 0;
5360 		struct got_diffstat_cb_arg dsa = {
5361 			0, 0, 0, 0, 0, 0,
5362 			&changed_paths,
5363 			s->ignore_whitespace,
5364 			s->force_text_diff,
5365 			tog_diff_algo
5366 		};
5367 
5368 		lines = malloc(sizeof(*lines));
5369 		if (lines == NULL) {
5370 			err = got_error_from_errno("malloc");
5371 			goto done;
5372 		}
5373 
5374 		/* build diff first in tmp file then append to commit info */
5375 		err = got_diff_objects_as_commits(&lines, &nlines,
5376 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5377 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5378 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5379 		if (err)
5380 			break;
5381 
5382 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5383 		/* Show commit info if we're diffing to a parent/root commit. */
5384 		if (s->id1 == NULL) {
5385 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5386 			    refs, s->repo, s->ignore_whitespace,
5387 			    s->force_text_diff, &dsa, s->f);
5388 			if (err)
5389 				goto done;
5390 		} else {
5391 			err = got_object_open_as_commit(&commit2, s->repo,
5392 			    s->id2);
5393 			if (err)
5394 				goto done;
5395 
5396 			parent_ids = got_object_commit_get_parent_ids(commit2);
5397 			STAILQ_FOREACH(pid, parent_ids, entry) {
5398 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5399 					err = write_commit_info(&s->lines,
5400 					    &s->nlines, s->id2, refs, s->repo,
5401 					    s->ignore_whitespace,
5402 					    s->force_text_diff, &dsa, s->f);
5403 					if (err)
5404 						goto done;
5405 					break;
5406 				}
5407 			}
5408 		}
5409 
5410 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5411 		    lines, nlines);
5412 		break;
5413 	}
5414 	default:
5415 		err = got_error(GOT_ERR_OBJ_TYPE);
5416 		break;
5417 	}
5418 done:
5419 	free(lines);
5420 	if (commit2 != NULL)
5421 		got_object_commit_close(commit2);
5422 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5423 	if (s->f && fflush(s->f) != 0 && err == NULL)
5424 		err = got_error_from_errno("fflush");
5425 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5426 		err = got_error_from_errno("fclose");
5427 	return err;
5428 }
5429 
5430 static void
5431 diff_view_indicate_progress(struct tog_view *view)
5432 {
5433 	mvwaddstr(view->window, 0, 0, "diffing...");
5434 	update_panels();
5435 	doupdate();
5436 }
5437 
5438 static const struct got_error *
5439 search_start_diff_view(struct tog_view *view)
5440 {
5441 	struct tog_diff_view_state *s = &view->state.diff;
5442 
5443 	s->matched_line = 0;
5444 	return NULL;
5445 }
5446 
5447 static void
5448 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5449     size_t *nlines, int **first, int **last, int **match, int **selected)
5450 {
5451 	struct tog_diff_view_state *s = &view->state.diff;
5452 
5453 	*f = s->f;
5454 	*nlines = s->nlines;
5455 	*line_offsets = NULL;
5456 	*match = &s->matched_line;
5457 	*first = &s->first_displayed_line;
5458 	*last = &s->last_displayed_line;
5459 	*selected = &s->selected_line;
5460 }
5461 
5462 static const struct got_error *
5463 search_next_view_match(struct tog_view *view)
5464 {
5465 	const struct got_error *err = NULL;
5466 	FILE *f;
5467 	int lineno;
5468 	char *line = NULL;
5469 	size_t linesize = 0;
5470 	ssize_t linelen;
5471 	off_t *line_offsets;
5472 	size_t nlines = 0;
5473 	int *first, *last, *match, *selected;
5474 
5475 	if (!view->search_setup)
5476 		return got_error_msg(GOT_ERR_NOT_IMPL,
5477 		    "view search not supported");
5478 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5479 	    &match, &selected);
5480 
5481 	if (!view->searching) {
5482 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5483 		return NULL;
5484 	}
5485 
5486 	if (*match) {
5487 		if (view->searching == TOG_SEARCH_FORWARD)
5488 			lineno = *first + 1;
5489 		else
5490 			lineno = *first - 1;
5491 	} else
5492 		lineno = *first - 1 + *selected;
5493 
5494 	while (1) {
5495 		off_t offset;
5496 
5497 		if (lineno <= 0 || lineno > nlines) {
5498 			if (*match == 0) {
5499 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5500 				break;
5501 			}
5502 
5503 			if (view->searching == TOG_SEARCH_FORWARD)
5504 				lineno = 1;
5505 			else
5506 				lineno = nlines;
5507 		}
5508 
5509 		offset = view->type == TOG_VIEW_DIFF ?
5510 		    view->state.diff.lines[lineno - 1].offset :
5511 		    line_offsets[lineno - 1];
5512 		if (fseeko(f, offset, SEEK_SET) != 0) {
5513 			free(line);
5514 			return got_error_from_errno("fseeko");
5515 		}
5516 		linelen = getline(&line, &linesize, f);
5517 		if (linelen != -1) {
5518 			char *exstr;
5519 			err = expand_tab(&exstr, line);
5520 			if (err)
5521 				break;
5522 			if (match_line(exstr, &view->regex, 1,
5523 			    &view->regmatch)) {
5524 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5525 				*match = lineno;
5526 				free(exstr);
5527 				break;
5528 			}
5529 			free(exstr);
5530 		}
5531 		if (view->searching == TOG_SEARCH_FORWARD)
5532 			lineno++;
5533 		else
5534 			lineno--;
5535 	}
5536 	free(line);
5537 
5538 	if (*match) {
5539 		*first = *match;
5540 		*selected = 1;
5541 	}
5542 
5543 	return err;
5544 }
5545 
5546 static const struct got_error *
5547 close_diff_view(struct tog_view *view)
5548 {
5549 	const struct got_error *err = NULL;
5550 	struct tog_diff_view_state *s = &view->state.diff;
5551 
5552 	free(s->id1);
5553 	s->id1 = NULL;
5554 	free(s->id2);
5555 	s->id2 = NULL;
5556 	if (s->f && fclose(s->f) == EOF)
5557 		err = got_error_from_errno("fclose");
5558 	s->f = NULL;
5559 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5560 		err = got_error_from_errno("fclose");
5561 	s->f1 = NULL;
5562 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5563 		err = got_error_from_errno("fclose");
5564 	s->f2 = NULL;
5565 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5566 		err = got_error_from_errno("close");
5567 	s->fd1 = -1;
5568 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5569 		err = got_error_from_errno("close");
5570 	s->fd2 = -1;
5571 	free(s->lines);
5572 	s->lines = NULL;
5573 	s->nlines = 0;
5574 	return err;
5575 }
5576 
5577 static const struct got_error *
5578 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5579     struct got_object_id *id2, const char *label1, const char *label2,
5580     int diff_context, int ignore_whitespace, int force_text_diff,
5581     struct tog_view *parent_view, struct got_repository *repo)
5582 {
5583 	const struct got_error *err;
5584 	struct tog_diff_view_state *s = &view->state.diff;
5585 
5586 	memset(s, 0, sizeof(*s));
5587 	s->fd1 = -1;
5588 	s->fd2 = -1;
5589 
5590 	if (id1 != NULL && id2 != NULL) {
5591 		int type1, type2;
5592 
5593 		err = got_object_get_type(&type1, repo, id1);
5594 		if (err)
5595 			goto done;
5596 		err = got_object_get_type(&type2, repo, id2);
5597 		if (err)
5598 			goto done;
5599 
5600 		if (type1 != type2) {
5601 			err = got_error(GOT_ERR_OBJ_TYPE);
5602 			goto done;
5603 		}
5604 	}
5605 	s->first_displayed_line = 1;
5606 	s->last_displayed_line = view->nlines;
5607 	s->selected_line = 1;
5608 	s->repo = repo;
5609 	s->label1 = label1;
5610 	s->label2 = label2;
5611 
5612 	if (id1) {
5613 		s->id1 = got_object_id_dup(id1);
5614 		if (s->id1 == NULL) {
5615 			err = got_error_from_errno("got_object_id_dup");
5616 			goto done;
5617 		}
5618 	} else
5619 		s->id1 = NULL;
5620 
5621 	s->id2 = got_object_id_dup(id2);
5622 	if (s->id2 == NULL) {
5623 		err = got_error_from_errno("got_object_id_dup");
5624 		goto done;
5625 	}
5626 
5627 	s->f1 = got_opentemp();
5628 	if (s->f1 == NULL) {
5629 		err = got_error_from_errno("got_opentemp");
5630 		goto done;
5631 	}
5632 
5633 	s->f2 = got_opentemp();
5634 	if (s->f2 == NULL) {
5635 		err = got_error_from_errno("got_opentemp");
5636 		goto done;
5637 	}
5638 
5639 	s->fd1 = got_opentempfd();
5640 	if (s->fd1 == -1) {
5641 		err = got_error_from_errno("got_opentempfd");
5642 		goto done;
5643 	}
5644 
5645 	s->fd2 = got_opentempfd();
5646 	if (s->fd2 == -1) {
5647 		err = got_error_from_errno("got_opentempfd");
5648 		goto done;
5649 	}
5650 
5651 	s->diff_context = diff_context;
5652 	s->ignore_whitespace = ignore_whitespace;
5653 	s->force_text_diff = force_text_diff;
5654 	s->parent_view = parent_view;
5655 	s->repo = repo;
5656 
5657 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5658 		int rc;
5659 
5660 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5661 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5662 		if (rc != ERR)
5663 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5664 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5665 		if (rc != ERR)
5666 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5667 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5668 		if (rc != ERR)
5669 			rc = init_pair(GOT_DIFF_LINE_META,
5670 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5671 		if (rc != ERR)
5672 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5673 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5674 		if (rc != ERR)
5675 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5676 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5677 		if (rc != ERR)
5678 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5679 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5680 		if (rc != ERR)
5681 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5682 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5683 		if (rc != ERR)
5684 			rc = init_pair(GOT_DIFF_LINE_DATE,
5685 			    get_color_value("TOG_COLOR_DATE"), -1);
5686 		if (rc == ERR) {
5687 			err = got_error(GOT_ERR_RANGE);
5688 			goto done;
5689 		}
5690 	}
5691 
5692 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5693 	    view_is_splitscreen(view))
5694 		show_log_view(parent_view); /* draw border */
5695 	diff_view_indicate_progress(view);
5696 
5697 	err = create_diff(s);
5698 
5699 	view->show = show_diff_view;
5700 	view->input = input_diff_view;
5701 	view->reset = reset_diff_view;
5702 	view->close = close_diff_view;
5703 	view->search_start = search_start_diff_view;
5704 	view->search_setup = search_setup_diff_view;
5705 	view->search_next = search_next_view_match;
5706 done:
5707 	if (err) {
5708 		if (view->close == NULL)
5709 			close_diff_view(view);
5710 		view_close(view);
5711 	}
5712 	return err;
5713 }
5714 
5715 static const struct got_error *
5716 show_diff_view(struct tog_view *view)
5717 {
5718 	const struct got_error *err;
5719 	struct tog_diff_view_state *s = &view->state.diff;
5720 	char *id_str1 = NULL, *id_str2, *header;
5721 	const char *label1, *label2;
5722 
5723 	if (s->id1) {
5724 		err = got_object_id_str(&id_str1, s->id1);
5725 		if (err)
5726 			return err;
5727 		label1 = s->label1 ? s->label1 : id_str1;
5728 	} else
5729 		label1 = "/dev/null";
5730 
5731 	err = got_object_id_str(&id_str2, s->id2);
5732 	if (err)
5733 		return err;
5734 	label2 = s->label2 ? s->label2 : id_str2;
5735 
5736 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5737 		err = got_error_from_errno("asprintf");
5738 		free(id_str1);
5739 		free(id_str2);
5740 		return err;
5741 	}
5742 	free(id_str1);
5743 	free(id_str2);
5744 
5745 	err = draw_file(view, header);
5746 	free(header);
5747 	return err;
5748 }
5749 
5750 static const struct got_error *
5751 set_selected_commit(struct tog_diff_view_state *s,
5752     struct commit_queue_entry *entry)
5753 {
5754 	const struct got_error *err;
5755 	const struct got_object_id_queue *parent_ids;
5756 	struct got_commit_object *selected_commit;
5757 	struct got_object_qid *pid;
5758 
5759 	free(s->id2);
5760 	s->id2 = got_object_id_dup(entry->id);
5761 	if (s->id2 == NULL)
5762 		return got_error_from_errno("got_object_id_dup");
5763 
5764 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5765 	if (err)
5766 		return err;
5767 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5768 	free(s->id1);
5769 	pid = STAILQ_FIRST(parent_ids);
5770 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5771 	got_object_commit_close(selected_commit);
5772 	return NULL;
5773 }
5774 
5775 static const struct got_error *
5776 reset_diff_view(struct tog_view *view)
5777 {
5778 	struct tog_diff_view_state *s = &view->state.diff;
5779 
5780 	view->count = 0;
5781 	wclear(view->window);
5782 	s->first_displayed_line = 1;
5783 	s->last_displayed_line = view->nlines;
5784 	s->matched_line = 0;
5785 	diff_view_indicate_progress(view);
5786 	return create_diff(s);
5787 }
5788 
5789 static void
5790 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5791 {
5792 	int start, i;
5793 
5794 	i = start = s->first_displayed_line - 1;
5795 
5796 	while (s->lines[i].type != type) {
5797 		if (i == 0)
5798 			i = s->nlines - 1;
5799 		if (--i == start)
5800 			return; /* do nothing, requested type not in file */
5801 	}
5802 
5803 	s->selected_line = 1;
5804 	s->first_displayed_line = i;
5805 }
5806 
5807 static void
5808 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5809 {
5810 	int start, i;
5811 
5812 	i = start = s->first_displayed_line + 1;
5813 
5814 	while (s->lines[i].type != type) {
5815 		if (i == s->nlines - 1)
5816 			i = 0;
5817 		if (++i == start)
5818 			return; /* do nothing, requested type not in file */
5819 	}
5820 
5821 	s->selected_line = 1;
5822 	s->first_displayed_line = i;
5823 }
5824 
5825 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5826     int, int, int);
5827 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5828     int, int);
5829 
5830 static const struct got_error *
5831 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5832 {
5833 	const struct got_error *err = NULL;
5834 	struct tog_diff_view_state *s = &view->state.diff;
5835 	struct tog_log_view_state *ls;
5836 	struct commit_queue_entry *old_selected_entry;
5837 	char *line = NULL;
5838 	size_t linesize = 0;
5839 	ssize_t linelen;
5840 	int i, nscroll = view->nlines - 1, up = 0;
5841 
5842 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5843 
5844 	switch (ch) {
5845 	case '0':
5846 	case '$':
5847 	case KEY_RIGHT:
5848 	case 'l':
5849 	case KEY_LEFT:
5850 	case 'h':
5851 		horizontal_scroll_input(view, ch);
5852 		break;
5853 	case 'a':
5854 	case 'w':
5855 		if (ch == 'a') {
5856 			s->force_text_diff = !s->force_text_diff;
5857 			view->action = s->force_text_diff ?
5858 			    "force ASCII text enabled" :
5859 			    "force ASCII text disabled";
5860 		}
5861 		else if (ch == 'w') {
5862 			s->ignore_whitespace = !s->ignore_whitespace;
5863 			view->action = s->ignore_whitespace ?
5864 			    "ignore whitespace enabled" :
5865 			    "ignore whitespace disabled";
5866 		}
5867 		err = reset_diff_view(view);
5868 		break;
5869 	case 'g':
5870 	case KEY_HOME:
5871 		s->first_displayed_line = 1;
5872 		view->count = 0;
5873 		break;
5874 	case 'G':
5875 	case KEY_END:
5876 		view->count = 0;
5877 		if (s->eof)
5878 			break;
5879 
5880 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5881 		s->eof = 1;
5882 		break;
5883 	case 'k':
5884 	case KEY_UP:
5885 	case CTRL('p'):
5886 		if (s->first_displayed_line > 1)
5887 			s->first_displayed_line--;
5888 		else
5889 			view->count = 0;
5890 		break;
5891 	case CTRL('u'):
5892 	case 'u':
5893 		nscroll /= 2;
5894 		/* FALL THROUGH */
5895 	case KEY_PPAGE:
5896 	case CTRL('b'):
5897 	case 'b':
5898 		if (s->first_displayed_line == 1) {
5899 			view->count = 0;
5900 			break;
5901 		}
5902 		i = 0;
5903 		while (i++ < nscroll && s->first_displayed_line > 1)
5904 			s->first_displayed_line--;
5905 		break;
5906 	case 'j':
5907 	case KEY_DOWN:
5908 	case CTRL('n'):
5909 		if (!s->eof)
5910 			s->first_displayed_line++;
5911 		else
5912 			view->count = 0;
5913 		break;
5914 	case CTRL('d'):
5915 	case 'd':
5916 		nscroll /= 2;
5917 		/* FALL THROUGH */
5918 	case KEY_NPAGE:
5919 	case CTRL('f'):
5920 	case 'f':
5921 	case ' ':
5922 		if (s->eof) {
5923 			view->count = 0;
5924 			break;
5925 		}
5926 		i = 0;
5927 		while (!s->eof && i++ < nscroll) {
5928 			linelen = getline(&line, &linesize, s->f);
5929 			s->first_displayed_line++;
5930 			if (linelen == -1) {
5931 				if (feof(s->f)) {
5932 					s->eof = 1;
5933 				} else
5934 					err = got_ferror(s->f, GOT_ERR_IO);
5935 				break;
5936 			}
5937 		}
5938 		free(line);
5939 		break;
5940 	case '(':
5941 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5942 		break;
5943 	case ')':
5944 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5945 		break;
5946 	case '{':
5947 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5948 		break;
5949 	case '}':
5950 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5951 		break;
5952 	case '[':
5953 		if (s->diff_context > 0) {
5954 			s->diff_context--;
5955 			s->matched_line = 0;
5956 			diff_view_indicate_progress(view);
5957 			err = create_diff(s);
5958 			if (s->first_displayed_line + view->nlines - 1 >
5959 			    s->nlines) {
5960 				s->first_displayed_line = 1;
5961 				s->last_displayed_line = view->nlines;
5962 			}
5963 		} else
5964 			view->count = 0;
5965 		break;
5966 	case ']':
5967 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5968 			s->diff_context++;
5969 			s->matched_line = 0;
5970 			diff_view_indicate_progress(view);
5971 			err = create_diff(s);
5972 		} else
5973 			view->count = 0;
5974 		break;
5975 	case '<':
5976 	case ',':
5977 	case 'K':
5978 		up = 1;
5979 		/* FALL THROUGH */
5980 	case '>':
5981 	case '.':
5982 	case 'J':
5983 		if (s->parent_view == NULL) {
5984 			view->count = 0;
5985 			break;
5986 		}
5987 		s->parent_view->count = view->count;
5988 
5989 		if (s->parent_view->type == TOG_VIEW_LOG) {
5990 			ls = &s->parent_view->state.log;
5991 			old_selected_entry = ls->selected_entry;
5992 
5993 			err = input_log_view(NULL, s->parent_view,
5994 			    up ? KEY_UP : KEY_DOWN);
5995 			if (err)
5996 				break;
5997 			view->count = s->parent_view->count;
5998 
5999 			if (old_selected_entry == ls->selected_entry)
6000 				break;
6001 
6002 			err = set_selected_commit(s, ls->selected_entry);
6003 			if (err)
6004 				break;
6005 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
6006 			struct tog_blame_view_state *bs;
6007 			struct got_object_id *id, *prev_id;
6008 
6009 			bs = &s->parent_view->state.blame;
6010 			prev_id = get_annotation_for_line(bs->blame.lines,
6011 			    bs->blame.nlines, bs->last_diffed_line);
6012 
6013 			err = input_blame_view(&view, s->parent_view,
6014 			    up ? KEY_UP : KEY_DOWN);
6015 			if (err)
6016 				break;
6017 			view->count = s->parent_view->count;
6018 
6019 			if (prev_id == NULL)
6020 				break;
6021 			id = get_selected_commit_id(bs->blame.lines,
6022 			    bs->blame.nlines, bs->first_displayed_line,
6023 			    bs->selected_line);
6024 			if (id == NULL)
6025 				break;
6026 
6027 			if (!got_object_id_cmp(prev_id, id))
6028 				break;
6029 
6030 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6031 			if (err)
6032 				break;
6033 		}
6034 		s->first_displayed_line = 1;
6035 		s->last_displayed_line = view->nlines;
6036 		s->matched_line = 0;
6037 		view->x = 0;
6038 
6039 		diff_view_indicate_progress(view);
6040 		err = create_diff(s);
6041 		break;
6042 	default:
6043 		view->count = 0;
6044 		break;
6045 	}
6046 
6047 	return err;
6048 }
6049 
6050 static const struct got_error *
6051 cmd_diff(int argc, char *argv[])
6052 {
6053 	const struct got_error *error;
6054 	struct got_repository *repo = NULL;
6055 	struct got_worktree *worktree = NULL;
6056 	struct got_object_id *id1 = NULL, *id2 = NULL;
6057 	char *repo_path = NULL, *cwd = NULL;
6058 	char *id_str1 = NULL, *id_str2 = NULL;
6059 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6060 	char *label1 = NULL, *label2 = NULL;
6061 	int diff_context = 3, ignore_whitespace = 0;
6062 	int ch, force_text_diff = 0;
6063 	const char *errstr;
6064 	struct tog_view *view;
6065 	int *pack_fds = NULL;
6066 
6067 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6068 		switch (ch) {
6069 		case 'a':
6070 			force_text_diff = 1;
6071 			break;
6072 		case 'C':
6073 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6074 			    &errstr);
6075 			if (errstr != NULL)
6076 				errx(1, "number of context lines is %s: %s",
6077 				    errstr, errstr);
6078 			break;
6079 		case 'r':
6080 			repo_path = realpath(optarg, NULL);
6081 			if (repo_path == NULL)
6082 				return got_error_from_errno2("realpath",
6083 				    optarg);
6084 			got_path_strip_trailing_slashes(repo_path);
6085 			break;
6086 		case 'w':
6087 			ignore_whitespace = 1;
6088 			break;
6089 		default:
6090 			usage_diff();
6091 			/* NOTREACHED */
6092 		}
6093 	}
6094 
6095 	argc -= optind;
6096 	argv += optind;
6097 
6098 	if (argc == 0) {
6099 		usage_diff(); /* TODO show local worktree changes */
6100 	} else if (argc == 2) {
6101 		id_str1 = argv[0];
6102 		id_str2 = argv[1];
6103 	} else
6104 		usage_diff();
6105 
6106 	error = got_repo_pack_fds_open(&pack_fds);
6107 	if (error)
6108 		goto done;
6109 
6110 	if (repo_path == NULL) {
6111 		cwd = getcwd(NULL, 0);
6112 		if (cwd == NULL)
6113 			return got_error_from_errno("getcwd");
6114 		error = got_worktree_open(&worktree, cwd, NULL);
6115 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6116 			goto done;
6117 		if (worktree)
6118 			repo_path =
6119 			    strdup(got_worktree_get_repo_path(worktree));
6120 		else
6121 			repo_path = strdup(cwd);
6122 		if (repo_path == NULL) {
6123 			error = got_error_from_errno("strdup");
6124 			goto done;
6125 		}
6126 	}
6127 
6128 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6129 	if (error)
6130 		goto done;
6131 
6132 	init_curses();
6133 
6134 	error = apply_unveil(got_repo_get_path(repo), NULL);
6135 	if (error)
6136 		goto done;
6137 
6138 	error = tog_load_refs(repo, 0);
6139 	if (error)
6140 		goto done;
6141 
6142 	if (id_str1 != NULL) {
6143 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6144 		    repo, worktree);
6145 		if (error != NULL)
6146 			goto done;
6147 		if (keyword_idstr1 != NULL)
6148 			id_str1 = keyword_idstr1;
6149 	}
6150 	if (id_str2 != NULL) {
6151 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6152 		    repo, worktree);
6153 		if (error != NULL)
6154 			goto done;
6155 		if (keyword_idstr2 != NULL)
6156 			id_str2 = keyword_idstr2;
6157 	}
6158 
6159 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6160 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6161 	if (error)
6162 		goto done;
6163 
6164 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6165 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6166 	if (error)
6167 		goto done;
6168 
6169 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6170 	if (view == NULL) {
6171 		error = got_error_from_errno("view_open");
6172 		goto done;
6173 	}
6174 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6175 	    ignore_whitespace, force_text_diff, NULL,  repo);
6176 	if (error)
6177 		goto done;
6178 
6179 	if (worktree) {
6180 		error = set_tog_base_commit(repo, worktree);
6181 		if (error != NULL)
6182 			goto done;
6183 
6184 		/* Release work tree lock. */
6185 		got_worktree_close(worktree);
6186 		worktree = NULL;
6187 	}
6188 
6189 	error = view_loop(view);
6190 
6191 done:
6192 	free(tog_base_commit.id);
6193 	free(keyword_idstr1);
6194 	free(keyword_idstr2);
6195 	free(label1);
6196 	free(label2);
6197 	free(id1);
6198 	free(id2);
6199 	free(repo_path);
6200 	free(cwd);
6201 	if (repo) {
6202 		const struct got_error *close_err = got_repo_close(repo);
6203 		if (error == NULL)
6204 			error = close_err;
6205 	}
6206 	if (worktree)
6207 		got_worktree_close(worktree);
6208 	if (pack_fds) {
6209 		const struct got_error *pack_err =
6210 		    got_repo_pack_fds_close(pack_fds);
6211 		if (error == NULL)
6212 			error = pack_err;
6213 	}
6214 	tog_free_refs();
6215 	return error;
6216 }
6217 
6218 __dead static void
6219 usage_blame(void)
6220 {
6221 	endwin();
6222 	fprintf(stderr,
6223 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6224 	    getprogname());
6225 	exit(1);
6226 }
6227 
6228 struct tog_blame_line {
6229 	int annotated;
6230 	struct got_object_id *id;
6231 };
6232 
6233 static const struct got_error *
6234 draw_blame(struct tog_view *view)
6235 {
6236 	struct tog_blame_view_state *s = &view->state.blame;
6237 	struct tog_blame *blame = &s->blame;
6238 	regmatch_t *regmatch = &view->regmatch;
6239 	const struct got_error *err;
6240 	int lineno = 0, nprinted = 0;
6241 	char *line = NULL;
6242 	size_t linesize = 0;
6243 	ssize_t linelen;
6244 	wchar_t *wline;
6245 	int width;
6246 	struct tog_blame_line *blame_line;
6247 	struct got_object_id *prev_id = NULL;
6248 	char *id_str;
6249 	struct tog_color *tc;
6250 
6251 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6252 	if (err)
6253 		return err;
6254 
6255 	rewind(blame->f);
6256 	werase(view->window);
6257 
6258 	if (asprintf(&line, "commit %s", id_str) == -1) {
6259 		err = got_error_from_errno("asprintf");
6260 		free(id_str);
6261 		return err;
6262 	}
6263 
6264 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6265 	free(line);
6266 	line = NULL;
6267 	if (err)
6268 		return err;
6269 	if (view_needs_focus_indication(view))
6270 		wstandout(view->window);
6271 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6272 	if (tc)
6273 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6274 	waddwstr(view->window, wline);
6275 	while (width++ < view->ncols)
6276 		waddch(view->window, ' ');
6277 	if (tc)
6278 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6279 	if (view_needs_focus_indication(view))
6280 		wstandend(view->window);
6281 	free(wline);
6282 	wline = NULL;
6283 
6284 	if (view->gline > blame->nlines)
6285 		view->gline = blame->nlines;
6286 
6287 	if (tog_io.wait_for_ui) {
6288 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6289 		int rc;
6290 
6291 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6292 		if (rc)
6293 			return got_error_set_errno(rc, "pthread_cond_wait");
6294 		tog_io.wait_for_ui = 0;
6295 	}
6296 
6297 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6298 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6299 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6300 		free(id_str);
6301 		return got_error_from_errno("asprintf");
6302 	}
6303 	free(id_str);
6304 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6305 	free(line);
6306 	line = NULL;
6307 	if (err)
6308 		return err;
6309 	waddwstr(view->window, wline);
6310 	free(wline);
6311 	wline = NULL;
6312 	if (width < view->ncols - 1)
6313 		waddch(view->window, '\n');
6314 
6315 	s->eof = 0;
6316 	view->maxx = 0;
6317 	while (nprinted < view->nlines - 2) {
6318 		linelen = getline(&line, &linesize, blame->f);
6319 		if (linelen == -1) {
6320 			if (feof(blame->f)) {
6321 				s->eof = 1;
6322 				break;
6323 			}
6324 			free(line);
6325 			return got_ferror(blame->f, GOT_ERR_IO);
6326 		}
6327 		if (++lineno < s->first_displayed_line)
6328 			continue;
6329 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6330 			continue;
6331 
6332 		/* Set view->maxx based on full line length. */
6333 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6334 		if (err) {
6335 			free(line);
6336 			return err;
6337 		}
6338 		free(wline);
6339 		wline = NULL;
6340 		view->maxx = MAX(view->maxx, width);
6341 
6342 		if (nprinted == s->selected_line - 1)
6343 			wstandout(view->window);
6344 
6345 		if (blame->nlines > 0) {
6346 			blame_line = &blame->lines[lineno - 1];
6347 			if (blame_line->annotated && prev_id &&
6348 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6349 			    !(nprinted == s->selected_line - 1)) {
6350 				waddstr(view->window, "        ");
6351 			} else if (blame_line->annotated) {
6352 				char *id_str;
6353 				err = got_object_id_str(&id_str,
6354 				    blame_line->id);
6355 				if (err) {
6356 					free(line);
6357 					return err;
6358 				}
6359 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6360 				if (tc)
6361 					wattr_on(view->window,
6362 					    COLOR_PAIR(tc->colorpair), NULL);
6363 				wprintw(view->window, "%.8s", id_str);
6364 				if (tc)
6365 					wattr_off(view->window,
6366 					    COLOR_PAIR(tc->colorpair), NULL);
6367 				free(id_str);
6368 				prev_id = blame_line->id;
6369 			} else {
6370 				waddstr(view->window, "........");
6371 				prev_id = NULL;
6372 			}
6373 		} else {
6374 			waddstr(view->window, "........");
6375 			prev_id = NULL;
6376 		}
6377 
6378 		if (nprinted == s->selected_line - 1)
6379 			wstandend(view->window);
6380 		waddstr(view->window, " ");
6381 
6382 		if (view->ncols <= 9) {
6383 			width = 9;
6384 		} else if (s->first_displayed_line + nprinted ==
6385 		    s->matched_line &&
6386 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6387 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6388 			    view->window, view->x, regmatch);
6389 			if (err) {
6390 				free(line);
6391 				return err;
6392 			}
6393 			width += 9;
6394 		} else {
6395 			int skip;
6396 			err = format_line(&wline, &width, &skip, line,
6397 			    view->x, view->ncols - 9, 9, 1);
6398 			if (err) {
6399 				free(line);
6400 				return err;
6401 			}
6402 			waddwstr(view->window, &wline[skip]);
6403 			width += 9;
6404 			free(wline);
6405 			wline = NULL;
6406 		}
6407 
6408 		if (width <= view->ncols - 1)
6409 			waddch(view->window, '\n');
6410 		if (++nprinted == 1)
6411 			s->first_displayed_line = lineno;
6412 	}
6413 	free(line);
6414 	s->last_displayed_line = lineno;
6415 
6416 	view_border(view);
6417 
6418 	return NULL;
6419 }
6420 
6421 static const struct got_error *
6422 blame_cb(void *arg, int nlines, int lineno,
6423     struct got_commit_object *commit, struct got_object_id *id)
6424 {
6425 	const struct got_error *err = NULL;
6426 	struct tog_blame_cb_args *a = arg;
6427 	struct tog_blame_line *line;
6428 	int errcode;
6429 
6430 	if (nlines != a->nlines ||
6431 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6432 		return got_error(GOT_ERR_RANGE);
6433 
6434 	errcode = pthread_mutex_lock(&tog_mutex);
6435 	if (errcode)
6436 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6437 
6438 	if (*a->quit) {	/* user has quit the blame view */
6439 		err = got_error(GOT_ERR_ITER_COMPLETED);
6440 		goto done;
6441 	}
6442 
6443 	if (lineno == -1)
6444 		goto done; /* no change in this commit */
6445 
6446 	line = &a->lines[lineno - 1];
6447 	if (line->annotated)
6448 		goto done;
6449 
6450 	line->id = got_object_id_dup(id);
6451 	if (line->id == NULL) {
6452 		err = got_error_from_errno("got_object_id_dup");
6453 		goto done;
6454 	}
6455 	line->annotated = 1;
6456 done:
6457 	errcode = pthread_mutex_unlock(&tog_mutex);
6458 	if (errcode)
6459 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6460 	return err;
6461 }
6462 
6463 static void *
6464 blame_thread(void *arg)
6465 {
6466 	const struct got_error *err, *close_err;
6467 	struct tog_blame_thread_args *ta = arg;
6468 	struct tog_blame_cb_args *a = ta->cb_args;
6469 	int errcode, fd1 = -1, fd2 = -1;
6470 	FILE *f1 = NULL, *f2 = NULL;
6471 
6472 	fd1 = got_opentempfd();
6473 	if (fd1 == -1)
6474 		return (void *)got_error_from_errno("got_opentempfd");
6475 
6476 	fd2 = got_opentempfd();
6477 	if (fd2 == -1) {
6478 		err = got_error_from_errno("got_opentempfd");
6479 		goto done;
6480 	}
6481 
6482 	f1 = got_opentemp();
6483 	if (f1 == NULL) {
6484 		err = (void *)got_error_from_errno("got_opentemp");
6485 		goto done;
6486 	}
6487 	f2 = got_opentemp();
6488 	if (f2 == NULL) {
6489 		err = (void *)got_error_from_errno("got_opentemp");
6490 		goto done;
6491 	}
6492 
6493 	err = block_signals_used_by_main_thread();
6494 	if (err)
6495 		goto done;
6496 
6497 	err = got_blame(ta->path, a->commit_id, ta->repo,
6498 	    tog_diff_algo, blame_cb, ta->cb_args,
6499 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6500 	if (err && err->code == GOT_ERR_CANCELLED)
6501 		err = NULL;
6502 
6503 	errcode = pthread_mutex_lock(&tog_mutex);
6504 	if (errcode) {
6505 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6506 		goto done;
6507 	}
6508 
6509 	close_err = got_repo_close(ta->repo);
6510 	if (err == NULL)
6511 		err = close_err;
6512 	ta->repo = NULL;
6513 	*ta->complete = 1;
6514 
6515 	if (tog_io.wait_for_ui) {
6516 		errcode = pthread_cond_signal(&ta->blame_complete);
6517 		if (errcode && err == NULL)
6518 			err = got_error_set_errno(errcode,
6519 			    "pthread_cond_signal");
6520 	}
6521 
6522 	errcode = pthread_mutex_unlock(&tog_mutex);
6523 	if (errcode && err == NULL)
6524 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6525 
6526 done:
6527 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6528 		err = got_error_from_errno("close");
6529 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6530 		err = got_error_from_errno("close");
6531 	if (f1 && fclose(f1) == EOF && err == NULL)
6532 		err = got_error_from_errno("fclose");
6533 	if (f2 && fclose(f2) == EOF && err == NULL)
6534 		err = got_error_from_errno("fclose");
6535 
6536 	return (void *)err;
6537 }
6538 
6539 static struct got_object_id *
6540 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6541     int first_displayed_line, int selected_line)
6542 {
6543 	struct tog_blame_line *line;
6544 
6545 	if (nlines <= 0)
6546 		return NULL;
6547 
6548 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6549 	if (!line->annotated)
6550 		return NULL;
6551 
6552 	return line->id;
6553 }
6554 
6555 static struct got_object_id *
6556 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6557     int lineno)
6558 {
6559 	struct tog_blame_line *line;
6560 
6561 	if (nlines <= 0 || lineno >= nlines)
6562 		return NULL;
6563 
6564 	line = &lines[lineno - 1];
6565 	if (!line->annotated)
6566 		return NULL;
6567 
6568 	return line->id;
6569 }
6570 
6571 static const struct got_error *
6572 stop_blame(struct tog_blame *blame)
6573 {
6574 	const struct got_error *err = NULL;
6575 	int i;
6576 
6577 	if (blame->thread) {
6578 		int errcode;
6579 		errcode = pthread_mutex_unlock(&tog_mutex);
6580 		if (errcode)
6581 			return got_error_set_errno(errcode,
6582 			    "pthread_mutex_unlock");
6583 		errcode = pthread_join(blame->thread, (void **)&err);
6584 		if (errcode)
6585 			return got_error_set_errno(errcode, "pthread_join");
6586 		errcode = pthread_mutex_lock(&tog_mutex);
6587 		if (errcode)
6588 			return got_error_set_errno(errcode,
6589 			    "pthread_mutex_lock");
6590 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6591 			err = NULL;
6592 		blame->thread = NULL;
6593 	}
6594 	if (blame->thread_args.repo) {
6595 		const struct got_error *close_err;
6596 		close_err = got_repo_close(blame->thread_args.repo);
6597 		if (err == NULL)
6598 			err = close_err;
6599 		blame->thread_args.repo = NULL;
6600 	}
6601 	if (blame->f) {
6602 		if (fclose(blame->f) == EOF && err == NULL)
6603 			err = got_error_from_errno("fclose");
6604 		blame->f = NULL;
6605 	}
6606 	if (blame->lines) {
6607 		for (i = 0; i < blame->nlines; i++)
6608 			free(blame->lines[i].id);
6609 		free(blame->lines);
6610 		blame->lines = NULL;
6611 	}
6612 	free(blame->cb_args.commit_id);
6613 	blame->cb_args.commit_id = NULL;
6614 	if (blame->pack_fds) {
6615 		const struct got_error *pack_err =
6616 		    got_repo_pack_fds_close(blame->pack_fds);
6617 		if (err == NULL)
6618 			err = pack_err;
6619 		blame->pack_fds = NULL;
6620 	}
6621 	free(blame->line_offsets);
6622 	blame->line_offsets = NULL;
6623 	return err;
6624 }
6625 
6626 static const struct got_error *
6627 cancel_blame_view(void *arg)
6628 {
6629 	const struct got_error *err = NULL;
6630 	int *done = arg;
6631 	int errcode;
6632 
6633 	errcode = pthread_mutex_lock(&tog_mutex);
6634 	if (errcode)
6635 		return got_error_set_errno(errcode,
6636 		    "pthread_mutex_unlock");
6637 
6638 	if (*done)
6639 		err = got_error(GOT_ERR_CANCELLED);
6640 
6641 	errcode = pthread_mutex_unlock(&tog_mutex);
6642 	if (errcode)
6643 		return got_error_set_errno(errcode,
6644 		    "pthread_mutex_lock");
6645 
6646 	return err;
6647 }
6648 
6649 static const struct got_error *
6650 run_blame(struct tog_view *view)
6651 {
6652 	struct tog_blame_view_state *s = &view->state.blame;
6653 	struct tog_blame *blame = &s->blame;
6654 	const struct got_error *err = NULL;
6655 	struct got_commit_object *commit = NULL;
6656 	struct got_blob_object *blob = NULL;
6657 	struct got_repository *thread_repo = NULL;
6658 	struct got_object_id *obj_id = NULL;
6659 	int obj_type, fd = -1;
6660 	int *pack_fds = NULL;
6661 
6662 	err = got_object_open_as_commit(&commit, s->repo,
6663 	    &s->blamed_commit->id);
6664 	if (err)
6665 		return err;
6666 
6667 	fd = got_opentempfd();
6668 	if (fd == -1) {
6669 		err = got_error_from_errno("got_opentempfd");
6670 		goto done;
6671 	}
6672 
6673 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6674 	if (err)
6675 		goto done;
6676 
6677 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6678 	if (err)
6679 		goto done;
6680 
6681 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6682 		err = got_error(GOT_ERR_OBJ_TYPE);
6683 		goto done;
6684 	}
6685 
6686 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6687 	if (err)
6688 		goto done;
6689 	blame->f = got_opentemp();
6690 	if (blame->f == NULL) {
6691 		err = got_error_from_errno("got_opentemp");
6692 		goto done;
6693 	}
6694 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6695 	    &blame->line_offsets, blame->f, blob);
6696 	if (err)
6697 		goto done;
6698 	if (blame->nlines == 0) {
6699 		s->blame_complete = 1;
6700 		goto done;
6701 	}
6702 
6703 	/* Don't include \n at EOF in the blame line count. */
6704 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6705 		blame->nlines--;
6706 
6707 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6708 	if (blame->lines == NULL) {
6709 		err = got_error_from_errno("calloc");
6710 		goto done;
6711 	}
6712 
6713 	err = got_repo_pack_fds_open(&pack_fds);
6714 	if (err)
6715 		goto done;
6716 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6717 	    pack_fds);
6718 	if (err)
6719 		goto done;
6720 
6721 	blame->pack_fds = pack_fds;
6722 	blame->cb_args.view = view;
6723 	blame->cb_args.lines = blame->lines;
6724 	blame->cb_args.nlines = blame->nlines;
6725 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6726 	if (blame->cb_args.commit_id == NULL) {
6727 		err = got_error_from_errno("got_object_id_dup");
6728 		goto done;
6729 	}
6730 	blame->cb_args.quit = &s->done;
6731 
6732 	blame->thread_args.path = s->path;
6733 	blame->thread_args.repo = thread_repo;
6734 	blame->thread_args.cb_args = &blame->cb_args;
6735 	blame->thread_args.complete = &s->blame_complete;
6736 	blame->thread_args.cancel_cb = cancel_blame_view;
6737 	blame->thread_args.cancel_arg = &s->done;
6738 	s->blame_complete = 0;
6739 
6740 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6741 		s->first_displayed_line = 1;
6742 		s->last_displayed_line = view->nlines;
6743 		s->selected_line = 1;
6744 	}
6745 	s->matched_line = 0;
6746 
6747 done:
6748 	if (commit)
6749 		got_object_commit_close(commit);
6750 	if (fd != -1 && close(fd) == -1 && err == NULL)
6751 		err = got_error_from_errno("close");
6752 	if (blob)
6753 		got_object_blob_close(blob);
6754 	free(obj_id);
6755 	if (err)
6756 		stop_blame(blame);
6757 	return err;
6758 }
6759 
6760 static const struct got_error *
6761 open_blame_view(struct tog_view *view, char *path,
6762     struct got_object_id *commit_id, struct got_repository *repo)
6763 {
6764 	const struct got_error *err = NULL;
6765 	struct tog_blame_view_state *s = &view->state.blame;
6766 
6767 	STAILQ_INIT(&s->blamed_commits);
6768 
6769 	s->path = strdup(path);
6770 	if (s->path == NULL)
6771 		return got_error_from_errno("strdup");
6772 
6773 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6774 	if (err) {
6775 		free(s->path);
6776 		return err;
6777 	}
6778 
6779 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6780 	s->first_displayed_line = 1;
6781 	s->last_displayed_line = view->nlines;
6782 	s->selected_line = 1;
6783 	s->blame_complete = 0;
6784 	s->repo = repo;
6785 	s->commit_id = commit_id;
6786 	memset(&s->blame, 0, sizeof(s->blame));
6787 
6788 	STAILQ_INIT(&s->colors);
6789 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6790 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6791 		    get_color_value("TOG_COLOR_COMMIT"));
6792 		if (err)
6793 			return err;
6794 	}
6795 
6796 	view->show = show_blame_view;
6797 	view->input = input_blame_view;
6798 	view->reset = reset_blame_view;
6799 	view->close = close_blame_view;
6800 	view->search_start = search_start_blame_view;
6801 	view->search_setup = search_setup_blame_view;
6802 	view->search_next = search_next_view_match;
6803 
6804 	if (using_mock_io) {
6805 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6806 		int rc;
6807 
6808 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6809 		if (rc)
6810 			return got_error_set_errno(rc, "pthread_cond_init");
6811 	}
6812 
6813 	return run_blame(view);
6814 }
6815 
6816 static const struct got_error *
6817 close_blame_view(struct tog_view *view)
6818 {
6819 	const struct got_error *err = NULL;
6820 	struct tog_blame_view_state *s = &view->state.blame;
6821 
6822 	if (s->blame.thread)
6823 		err = stop_blame(&s->blame);
6824 
6825 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6826 		struct got_object_qid *blamed_commit;
6827 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6828 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6829 		got_object_qid_free(blamed_commit);
6830 	}
6831 
6832 	if (using_mock_io) {
6833 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6834 		int rc;
6835 
6836 		rc = pthread_cond_destroy(&bta->blame_complete);
6837 		if (rc && err == NULL)
6838 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6839 	}
6840 
6841 	free(s->path);
6842 	free_colors(&s->colors);
6843 	return err;
6844 }
6845 
6846 static const struct got_error *
6847 search_start_blame_view(struct tog_view *view)
6848 {
6849 	struct tog_blame_view_state *s = &view->state.blame;
6850 
6851 	s->matched_line = 0;
6852 	return NULL;
6853 }
6854 
6855 static void
6856 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6857     size_t *nlines, int **first, int **last, int **match, int **selected)
6858 {
6859 	struct tog_blame_view_state *s = &view->state.blame;
6860 
6861 	*f = s->blame.f;
6862 	*nlines = s->blame.nlines;
6863 	*line_offsets = s->blame.line_offsets;
6864 	*match = &s->matched_line;
6865 	*first = &s->first_displayed_line;
6866 	*last = &s->last_displayed_line;
6867 	*selected = &s->selected_line;
6868 }
6869 
6870 static const struct got_error *
6871 show_blame_view(struct tog_view *view)
6872 {
6873 	const struct got_error *err = NULL;
6874 	struct tog_blame_view_state *s = &view->state.blame;
6875 	int errcode;
6876 
6877 	if (s->blame.thread == NULL && !s->blame_complete) {
6878 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6879 		    &s->blame.thread_args);
6880 		if (errcode)
6881 			return got_error_set_errno(errcode, "pthread_create");
6882 
6883 		if (!using_mock_io)
6884 			halfdelay(1); /* fast refresh while annotating  */
6885 	}
6886 
6887 	if (s->blame_complete && !using_mock_io)
6888 		halfdelay(10); /* disable fast refresh */
6889 
6890 	err = draw_blame(view);
6891 
6892 	view_border(view);
6893 	return err;
6894 }
6895 
6896 static const struct got_error *
6897 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6898     struct got_repository *repo, struct got_object_id *id)
6899 {
6900 	struct tog_view		*log_view;
6901 	const struct got_error	*err = NULL;
6902 
6903 	*new_view = NULL;
6904 
6905 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6906 	if (log_view == NULL)
6907 		return got_error_from_errno("view_open");
6908 
6909 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6910 	if (err)
6911 		view_close(log_view);
6912 	else
6913 		*new_view = log_view;
6914 
6915 	return err;
6916 }
6917 
6918 static const struct got_error *
6919 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6920 {
6921 	const struct got_error *err = NULL, *thread_err = NULL;
6922 	struct tog_view *diff_view;
6923 	struct tog_blame_view_state *s = &view->state.blame;
6924 	int eos, nscroll, begin_y = 0, begin_x = 0;
6925 
6926 	eos = nscroll = view->nlines - 2;
6927 	if (view_is_hsplit_top(view))
6928 		--eos;  /* border */
6929 
6930 	switch (ch) {
6931 	case '0':
6932 	case '$':
6933 	case KEY_RIGHT:
6934 	case 'l':
6935 	case KEY_LEFT:
6936 	case 'h':
6937 		horizontal_scroll_input(view, ch);
6938 		break;
6939 	case 'q':
6940 		s->done = 1;
6941 		break;
6942 	case 'g':
6943 	case KEY_HOME:
6944 		s->selected_line = 1;
6945 		s->first_displayed_line = 1;
6946 		view->count = 0;
6947 		break;
6948 	case 'G':
6949 	case KEY_END:
6950 		if (s->blame.nlines < eos) {
6951 			s->selected_line = s->blame.nlines;
6952 			s->first_displayed_line = 1;
6953 		} else {
6954 			s->selected_line = eos;
6955 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6956 		}
6957 		view->count = 0;
6958 		break;
6959 	case 'k':
6960 	case KEY_UP:
6961 	case CTRL('p'):
6962 		if (s->selected_line > 1)
6963 			s->selected_line--;
6964 		else if (s->selected_line == 1 &&
6965 		    s->first_displayed_line > 1)
6966 			s->first_displayed_line--;
6967 		else
6968 			view->count = 0;
6969 		break;
6970 	case CTRL('u'):
6971 	case 'u':
6972 		nscroll /= 2;
6973 		/* FALL THROUGH */
6974 	case KEY_PPAGE:
6975 	case CTRL('b'):
6976 	case 'b':
6977 		if (s->first_displayed_line == 1) {
6978 			if (view->count > 1)
6979 				nscroll += nscroll;
6980 			s->selected_line = MAX(1, s->selected_line - nscroll);
6981 			view->count = 0;
6982 			break;
6983 		}
6984 		if (s->first_displayed_line > nscroll)
6985 			s->first_displayed_line -= nscroll;
6986 		else
6987 			s->first_displayed_line = 1;
6988 		break;
6989 	case 'j':
6990 	case KEY_DOWN:
6991 	case CTRL('n'):
6992 		if (s->selected_line < eos && s->first_displayed_line +
6993 		    s->selected_line <= s->blame.nlines)
6994 			s->selected_line++;
6995 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6996 			s->first_displayed_line++;
6997 		else
6998 			view->count = 0;
6999 		break;
7000 	case 'c':
7001 	case 'p': {
7002 		struct got_object_id *id = NULL;
7003 
7004 		view->count = 0;
7005 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7006 		    s->first_displayed_line, s->selected_line);
7007 		if (id == NULL)
7008 			break;
7009 		if (ch == 'p') {
7010 			struct got_commit_object *commit, *pcommit;
7011 			struct got_object_qid *pid;
7012 			struct got_object_id *blob_id = NULL;
7013 			int obj_type;
7014 			err = got_object_open_as_commit(&commit,
7015 			    s->repo, id);
7016 			if (err)
7017 				break;
7018 			pid = STAILQ_FIRST(
7019 			    got_object_commit_get_parent_ids(commit));
7020 			if (pid == NULL) {
7021 				got_object_commit_close(commit);
7022 				break;
7023 			}
7024 			/* Check if path history ends here. */
7025 			err = got_object_open_as_commit(&pcommit,
7026 			    s->repo, &pid->id);
7027 			if (err)
7028 				break;
7029 			err = got_object_id_by_path(&blob_id, s->repo,
7030 			    pcommit, s->path);
7031 			got_object_commit_close(pcommit);
7032 			if (err) {
7033 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7034 					err = NULL;
7035 				got_object_commit_close(commit);
7036 				break;
7037 			}
7038 			err = got_object_get_type(&obj_type, s->repo,
7039 			    blob_id);
7040 			free(blob_id);
7041 			/* Can't blame non-blob type objects. */
7042 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7043 				got_object_commit_close(commit);
7044 				break;
7045 			}
7046 			err = got_object_qid_alloc(&s->blamed_commit,
7047 			    &pid->id);
7048 			got_object_commit_close(commit);
7049 		} else {
7050 			if (got_object_id_cmp(id,
7051 			    &s->blamed_commit->id) == 0)
7052 				break;
7053 			err = got_object_qid_alloc(&s->blamed_commit,
7054 			    id);
7055 		}
7056 		if (err)
7057 			break;
7058 		s->done = 1;
7059 		thread_err = stop_blame(&s->blame);
7060 		s->done = 0;
7061 		if (thread_err)
7062 			break;
7063 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7064 		    s->blamed_commit, entry);
7065 		err = run_blame(view);
7066 		if (err)
7067 			break;
7068 		break;
7069 	}
7070 	case 'C': {
7071 		struct got_object_qid *first;
7072 
7073 		view->count = 0;
7074 		first = STAILQ_FIRST(&s->blamed_commits);
7075 		if (!got_object_id_cmp(&first->id, s->commit_id))
7076 			break;
7077 		s->done = 1;
7078 		thread_err = stop_blame(&s->blame);
7079 		s->done = 0;
7080 		if (thread_err)
7081 			break;
7082 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7083 		got_object_qid_free(s->blamed_commit);
7084 		s->blamed_commit =
7085 		    STAILQ_FIRST(&s->blamed_commits);
7086 		err = run_blame(view);
7087 		if (err)
7088 			break;
7089 		break;
7090 	}
7091 	case 'L':
7092 		view->count = 0;
7093 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7094 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7095 		if (s->id_to_log)
7096 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7097 		break;
7098 	case KEY_ENTER:
7099 	case '\r': {
7100 		struct got_object_id *id = NULL;
7101 		struct got_object_qid *pid;
7102 		struct got_commit_object *commit = NULL;
7103 
7104 		view->count = 0;
7105 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7106 		    s->first_displayed_line, s->selected_line);
7107 		if (id == NULL)
7108 			break;
7109 		err = got_object_open_as_commit(&commit, s->repo, id);
7110 		if (err)
7111 			break;
7112 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7113 		if (*new_view) {
7114 			/* traversed from diff view, release diff resources  */
7115 			err = close_diff_view(*new_view);
7116 			if (err)
7117 				break;
7118 			diff_view = *new_view;
7119 		} else {
7120 			if (view_is_parent_view(view))
7121 				view_get_split(view, &begin_y, &begin_x);
7122 
7123 			diff_view = view_open(0, 0, begin_y, begin_x,
7124 			    TOG_VIEW_DIFF);
7125 			if (diff_view == NULL) {
7126 				got_object_commit_close(commit);
7127 				err = got_error_from_errno("view_open");
7128 				break;
7129 			}
7130 		}
7131 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7132 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7133 		got_object_commit_close(commit);
7134 		if (err)
7135 			break;
7136 		s->last_diffed_line = s->first_displayed_line - 1 +
7137 		    s->selected_line;
7138 		if (*new_view)
7139 			break;	/* still open from active diff view */
7140 		if (view_is_parent_view(view) &&
7141 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7142 			err = view_init_hsplit(view, begin_y);
7143 			if (err)
7144 				break;
7145 		}
7146 
7147 		view->focussed = 0;
7148 		diff_view->focussed = 1;
7149 		diff_view->mode = view->mode;
7150 		diff_view->nlines = view->lines - begin_y;
7151 		if (view_is_parent_view(view)) {
7152 			view_transfer_size(diff_view, view);
7153 			err = view_close_child(view);
7154 			if (err)
7155 				break;
7156 			err = view_set_child(view, diff_view);
7157 			if (err)
7158 				break;
7159 			view->focus_child = 1;
7160 		} else
7161 			*new_view = diff_view;
7162 		if (err)
7163 			break;
7164 		break;
7165 	}
7166 	case CTRL('d'):
7167 	case 'd':
7168 		nscroll /= 2;
7169 		/* FALL THROUGH */
7170 	case KEY_NPAGE:
7171 	case CTRL('f'):
7172 	case 'f':
7173 	case ' ':
7174 		if (s->last_displayed_line >= s->blame.nlines &&
7175 		    s->selected_line >= MIN(s->blame.nlines,
7176 		    view->nlines - 2)) {
7177 			view->count = 0;
7178 			break;
7179 		}
7180 		if (s->last_displayed_line >= s->blame.nlines &&
7181 		    s->selected_line < view->nlines - 2) {
7182 			s->selected_line +=
7183 			    MIN(nscroll, s->last_displayed_line -
7184 			    s->first_displayed_line - s->selected_line + 1);
7185 		}
7186 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7187 			s->first_displayed_line += nscroll;
7188 		else
7189 			s->first_displayed_line =
7190 			    s->blame.nlines - (view->nlines - 3);
7191 		break;
7192 	case KEY_RESIZE:
7193 		if (s->selected_line > view->nlines - 2) {
7194 			s->selected_line = MIN(s->blame.nlines,
7195 			    view->nlines - 2);
7196 		}
7197 		break;
7198 	default:
7199 		view->count = 0;
7200 		break;
7201 	}
7202 	return thread_err ? thread_err : err;
7203 }
7204 
7205 static const struct got_error *
7206 reset_blame_view(struct tog_view *view)
7207 {
7208 	const struct got_error *err;
7209 	struct tog_blame_view_state *s = &view->state.blame;
7210 
7211 	view->count = 0;
7212 	s->done = 1;
7213 	err = stop_blame(&s->blame);
7214 	s->done = 0;
7215 	if (err)
7216 		return err;
7217 	return run_blame(view);
7218 }
7219 
7220 static const struct got_error *
7221 cmd_blame(int argc, char *argv[])
7222 {
7223 	const struct got_error *error;
7224 	struct got_repository *repo = NULL;
7225 	struct got_worktree *worktree = NULL;
7226 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7227 	char *link_target = NULL;
7228 	struct got_object_id *commit_id = NULL;
7229 	struct got_commit_object *commit = NULL;
7230 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7231 	int ch;
7232 	struct tog_view *view = NULL;
7233 	int *pack_fds = NULL;
7234 
7235 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7236 		switch (ch) {
7237 		case 'c':
7238 			commit_id_str = optarg;
7239 			break;
7240 		case 'r':
7241 			repo_path = realpath(optarg, NULL);
7242 			if (repo_path == NULL)
7243 				return got_error_from_errno2("realpath",
7244 				    optarg);
7245 			break;
7246 		default:
7247 			usage_blame();
7248 			/* NOTREACHED */
7249 		}
7250 	}
7251 
7252 	argc -= optind;
7253 	argv += optind;
7254 
7255 	if (argc != 1)
7256 		usage_blame();
7257 
7258 	error = got_repo_pack_fds_open(&pack_fds);
7259 	if (error != NULL)
7260 		goto done;
7261 
7262 	if (repo_path == NULL) {
7263 		cwd = getcwd(NULL, 0);
7264 		if (cwd == NULL)
7265 			return got_error_from_errno("getcwd");
7266 		error = got_worktree_open(&worktree, cwd, NULL);
7267 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7268 			goto done;
7269 		if (worktree)
7270 			repo_path =
7271 			    strdup(got_worktree_get_repo_path(worktree));
7272 		else
7273 			repo_path = strdup(cwd);
7274 		if (repo_path == NULL) {
7275 			error = got_error_from_errno("strdup");
7276 			goto done;
7277 		}
7278 	}
7279 
7280 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7281 	if (error != NULL)
7282 		goto done;
7283 
7284 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7285 	    worktree);
7286 	if (error)
7287 		goto done;
7288 
7289 	init_curses();
7290 
7291 	error = apply_unveil(got_repo_get_path(repo), NULL);
7292 	if (error)
7293 		goto done;
7294 
7295 	error = tog_load_refs(repo, 0);
7296 	if (error)
7297 		goto done;
7298 
7299 	if (commit_id_str == NULL) {
7300 		struct got_reference *head_ref;
7301 		error = got_ref_open(&head_ref, repo, worktree ?
7302 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7303 		if (error != NULL)
7304 			goto done;
7305 		error = got_ref_resolve(&commit_id, repo, head_ref);
7306 		got_ref_close(head_ref);
7307 	} else {
7308 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7309 		    repo, worktree);
7310 		if (error != NULL)
7311 			goto done;
7312 		if (keyword_idstr != NULL)
7313 			commit_id_str = keyword_idstr;
7314 
7315 		error = got_repo_match_object_id(&commit_id, NULL,
7316 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7317 	}
7318 	if (error != NULL)
7319 		goto done;
7320 
7321 	error = got_object_open_as_commit(&commit, repo, commit_id);
7322 	if (error)
7323 		goto done;
7324 
7325 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7326 	    commit, repo);
7327 	if (error)
7328 		goto done;
7329 
7330 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7331 	if (view == NULL) {
7332 		error = got_error_from_errno("view_open");
7333 		goto done;
7334 	}
7335 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7336 	    commit_id, repo);
7337 	if (error != NULL) {
7338 		if (view->close == NULL)
7339 			close_blame_view(view);
7340 		view_close(view);
7341 		goto done;
7342 	}
7343 
7344 	if (worktree) {
7345 		error = set_tog_base_commit(repo, worktree);
7346 		if (error != NULL)
7347 			goto done;
7348 
7349 		/* Release work tree lock. */
7350 		got_worktree_close(worktree);
7351 		worktree = NULL;
7352 	}
7353 
7354 	error = view_loop(view);
7355 
7356 done:
7357 	free(tog_base_commit.id);
7358 	free(repo_path);
7359 	free(in_repo_path);
7360 	free(link_target);
7361 	free(cwd);
7362 	free(commit_id);
7363 	free(keyword_idstr);
7364 	if (commit)
7365 		got_object_commit_close(commit);
7366 	if (worktree)
7367 		got_worktree_close(worktree);
7368 	if (repo) {
7369 		const struct got_error *close_err = got_repo_close(repo);
7370 		if (error == NULL)
7371 			error = close_err;
7372 	}
7373 	if (pack_fds) {
7374 		const struct got_error *pack_err =
7375 		    got_repo_pack_fds_close(pack_fds);
7376 		if (error == NULL)
7377 			error = pack_err;
7378 	}
7379 	tog_free_refs();
7380 	return error;
7381 }
7382 
7383 static const struct got_error *
7384 draw_tree_entries(struct tog_view *view, const char *parent_path)
7385 {
7386 	struct tog_tree_view_state *s = &view->state.tree;
7387 	const struct got_error *err = NULL;
7388 	struct got_tree_entry *te;
7389 	wchar_t *wline;
7390 	char *index = NULL;
7391 	struct tog_color *tc;
7392 	int width, n, nentries, scrollx, i = 1;
7393 	int limit = view->nlines;
7394 
7395 	s->ndisplayed = 0;
7396 	if (view_is_hsplit_top(view))
7397 		--limit;  /* border */
7398 
7399 	werase(view->window);
7400 
7401 	if (limit == 0)
7402 		return NULL;
7403 
7404 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7405 	    0, 0);
7406 	if (err)
7407 		return err;
7408 	if (view_needs_focus_indication(view))
7409 		wstandout(view->window);
7410 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7411 	if (tc)
7412 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7413 	waddwstr(view->window, wline);
7414 	free(wline);
7415 	wline = NULL;
7416 	while (width++ < view->ncols)
7417 		waddch(view->window, ' ');
7418 	if (tc)
7419 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7420 	if (view_needs_focus_indication(view))
7421 		wstandend(view->window);
7422 	if (--limit <= 0)
7423 		return NULL;
7424 
7425 	i += s->selected;
7426 	if (s->first_displayed_entry) {
7427 		i += got_tree_entry_get_index(s->first_displayed_entry);
7428 		if (s->tree != s->root)
7429 			++i;  /* account for ".." entry */
7430 	}
7431 	nentries = got_object_tree_get_nentries(s->tree);
7432 	if (asprintf(&index, "[%d/%d] %s",
7433 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7434 		return got_error_from_errno("asprintf");
7435 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7436 	free(index);
7437 	if (err)
7438 		return err;
7439 	waddwstr(view->window, wline);
7440 	free(wline);
7441 	wline = NULL;
7442 	if (width < view->ncols - 1)
7443 		waddch(view->window, '\n');
7444 	if (--limit <= 0)
7445 		return NULL;
7446 	waddch(view->window, '\n');
7447 	if (--limit <= 0)
7448 		return NULL;
7449 
7450 	if (s->first_displayed_entry == NULL) {
7451 		te = got_object_tree_get_first_entry(s->tree);
7452 		if (s->selected == 0) {
7453 			if (view->focussed)
7454 				wstandout(view->window);
7455 			s->selected_entry = NULL;
7456 		}
7457 		waddstr(view->window, "  ..\n");	/* parent directory */
7458 		if (s->selected == 0 && view->focussed)
7459 			wstandend(view->window);
7460 		s->ndisplayed++;
7461 		if (--limit <= 0)
7462 			return NULL;
7463 		n = 1;
7464 	} else {
7465 		n = 0;
7466 		te = s->first_displayed_entry;
7467 	}
7468 
7469 	view->maxx = 0;
7470 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7471 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7472 		const char *modestr = "";
7473 		mode_t mode;
7474 
7475 		te = got_object_tree_get_entry(s->tree, i);
7476 		mode = got_tree_entry_get_mode(te);
7477 
7478 		if (s->show_ids) {
7479 			err = got_object_id_str(&id_str,
7480 			    got_tree_entry_get_id(te));
7481 			if (err)
7482 				return got_error_from_errno(
7483 				    "got_object_id_str");
7484 		}
7485 		if (got_object_tree_entry_is_submodule(te))
7486 			modestr = "$";
7487 		else if (S_ISLNK(mode)) {
7488 			int i;
7489 
7490 			err = got_tree_entry_get_symlink_target(&link_target,
7491 			    te, s->repo);
7492 			if (err) {
7493 				free(id_str);
7494 				return err;
7495 			}
7496 			for (i = 0; link_target[i] != '\0'; i++) {
7497 				if (!isprint((unsigned char)link_target[i]))
7498 					link_target[i] = '?';
7499 			}
7500 			modestr = "@";
7501 		}
7502 		else if (S_ISDIR(mode))
7503 			modestr = "/";
7504 		else if (mode & S_IXUSR)
7505 			modestr = "*";
7506 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7507 		    got_tree_entry_get_name(te), modestr,
7508 		    link_target ? " -> ": "",
7509 		    link_target ? link_target : "") == -1) {
7510 			free(id_str);
7511 			free(link_target);
7512 			return got_error_from_errno("asprintf");
7513 		}
7514 		free(id_str);
7515 		free(link_target);
7516 
7517 		/* use full line width to determine view->maxx */
7518 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7519 		if (err) {
7520 			free(line);
7521 			break;
7522 		}
7523 		view->maxx = MAX(view->maxx, width);
7524 		free(wline);
7525 		wline = NULL;
7526 
7527 		err = format_line(&wline, &width, &scrollx, line, view->x,
7528 		    view->ncols, 0, 0);
7529 		if (err) {
7530 			free(line);
7531 			break;
7532 		}
7533 		if (n == s->selected) {
7534 			if (view->focussed)
7535 				wstandout(view->window);
7536 			s->selected_entry = te;
7537 		}
7538 		tc = match_color(&s->colors, line);
7539 		if (tc)
7540 			wattr_on(view->window,
7541 			    COLOR_PAIR(tc->colorpair), NULL);
7542 		waddwstr(view->window, &wline[scrollx]);
7543 		if (tc)
7544 			wattr_off(view->window,
7545 			    COLOR_PAIR(tc->colorpair), NULL);
7546 		if (width < view->ncols)
7547 			waddch(view->window, '\n');
7548 		if (n == s->selected && view->focussed)
7549 			wstandend(view->window);
7550 		free(line);
7551 		free(wline);
7552 		wline = NULL;
7553 		n++;
7554 		s->ndisplayed++;
7555 		s->last_displayed_entry = te;
7556 		if (--limit <= 0)
7557 			break;
7558 	}
7559 
7560 	return err;
7561 }
7562 
7563 static void
7564 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7565 {
7566 	struct got_tree_entry *te;
7567 	int isroot = s->tree == s->root;
7568 	int i = 0;
7569 
7570 	if (s->first_displayed_entry == NULL)
7571 		return;
7572 
7573 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7574 	while (i++ < maxscroll) {
7575 		if (te == NULL) {
7576 			if (!isroot)
7577 				s->first_displayed_entry = NULL;
7578 			break;
7579 		}
7580 		s->first_displayed_entry = te;
7581 		te = got_tree_entry_get_prev(s->tree, te);
7582 	}
7583 }
7584 
7585 static const struct got_error *
7586 tree_scroll_down(struct tog_view *view, int maxscroll)
7587 {
7588 	struct tog_tree_view_state *s = &view->state.tree;
7589 	struct got_tree_entry *next, *last;
7590 	int n = 0;
7591 
7592 	if (s->first_displayed_entry)
7593 		next = got_tree_entry_get_next(s->tree,
7594 		    s->first_displayed_entry);
7595 	else
7596 		next = got_object_tree_get_first_entry(s->tree);
7597 
7598 	last = s->last_displayed_entry;
7599 	while (next && n++ < maxscroll) {
7600 		if (last) {
7601 			s->last_displayed_entry = last;
7602 			last = got_tree_entry_get_next(s->tree, last);
7603 		}
7604 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7605 			s->first_displayed_entry = next;
7606 			next = got_tree_entry_get_next(s->tree, next);
7607 		}
7608 	}
7609 
7610 	return NULL;
7611 }
7612 
7613 static const struct got_error *
7614 tree_entry_path(char **path, struct tog_parent_trees *parents,
7615     struct got_tree_entry *te)
7616 {
7617 	const struct got_error *err = NULL;
7618 	struct tog_parent_tree *pt;
7619 	size_t len = 2; /* for leading slash and NUL */
7620 
7621 	TAILQ_FOREACH(pt, parents, entry)
7622 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7623 		    + 1 /* slash */;
7624 	if (te)
7625 		len += strlen(got_tree_entry_get_name(te));
7626 
7627 	*path = calloc(1, len);
7628 	if (path == NULL)
7629 		return got_error_from_errno("calloc");
7630 
7631 	(*path)[0] = '/';
7632 	pt = TAILQ_LAST(parents, tog_parent_trees);
7633 	while (pt) {
7634 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7635 		if (strlcat(*path, name, len) >= len) {
7636 			err = got_error(GOT_ERR_NO_SPACE);
7637 			goto done;
7638 		}
7639 		if (strlcat(*path, "/", len) >= len) {
7640 			err = got_error(GOT_ERR_NO_SPACE);
7641 			goto done;
7642 		}
7643 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7644 	}
7645 	if (te) {
7646 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7647 			err = got_error(GOT_ERR_NO_SPACE);
7648 			goto done;
7649 		}
7650 	}
7651 done:
7652 	if (err) {
7653 		free(*path);
7654 		*path = NULL;
7655 	}
7656 	return err;
7657 }
7658 
7659 static const struct got_error *
7660 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7661     struct got_tree_entry *te, struct tog_parent_trees *parents,
7662     struct got_object_id *commit_id, struct got_repository *repo)
7663 {
7664 	const struct got_error *err = NULL;
7665 	char *path;
7666 	struct tog_view *blame_view;
7667 
7668 	*new_view = NULL;
7669 
7670 	err = tree_entry_path(&path, parents, te);
7671 	if (err)
7672 		return err;
7673 
7674 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7675 	if (blame_view == NULL) {
7676 		err = got_error_from_errno("view_open");
7677 		goto done;
7678 	}
7679 
7680 	err = open_blame_view(blame_view, path, commit_id, repo);
7681 	if (err) {
7682 		if (err->code == GOT_ERR_CANCELLED)
7683 			err = NULL;
7684 		view_close(blame_view);
7685 	} else
7686 		*new_view = blame_view;
7687 done:
7688 	free(path);
7689 	return err;
7690 }
7691 
7692 static const struct got_error *
7693 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7694     struct tog_tree_view_state *s)
7695 {
7696 	struct tog_view *log_view;
7697 	const struct got_error *err = NULL;
7698 	char *path;
7699 
7700 	*new_view = NULL;
7701 
7702 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7703 	if (log_view == NULL)
7704 		return got_error_from_errno("view_open");
7705 
7706 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7707 	if (err)
7708 		return err;
7709 
7710 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7711 	    path, 0, NULL);
7712 	if (err)
7713 		view_close(log_view);
7714 	else
7715 		*new_view = log_view;
7716 	free(path);
7717 	return err;
7718 }
7719 
7720 static const struct got_error *
7721 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7722     const char *head_ref_name, struct got_repository *repo)
7723 {
7724 	const struct got_error *err = NULL;
7725 	char *commit_id_str = NULL;
7726 	struct tog_tree_view_state *s = &view->state.tree;
7727 	struct got_commit_object *commit = NULL;
7728 
7729 	TAILQ_INIT(&s->parents);
7730 	STAILQ_INIT(&s->colors);
7731 
7732 	s->commit_id = got_object_id_dup(commit_id);
7733 	if (s->commit_id == NULL) {
7734 		err = got_error_from_errno("got_object_id_dup");
7735 		goto done;
7736 	}
7737 
7738 	err = got_object_open_as_commit(&commit, repo, commit_id);
7739 	if (err)
7740 		goto done;
7741 
7742 	/*
7743 	 * The root is opened here and will be closed when the view is closed.
7744 	 * Any visited subtrees and their path-wise parents are opened and
7745 	 * closed on demand.
7746 	 */
7747 	err = got_object_open_as_tree(&s->root, repo,
7748 	    got_object_commit_get_tree_id(commit));
7749 	if (err)
7750 		goto done;
7751 	s->tree = s->root;
7752 
7753 	err = got_object_id_str(&commit_id_str, commit_id);
7754 	if (err != NULL)
7755 		goto done;
7756 
7757 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7758 		err = got_error_from_errno("asprintf");
7759 		goto done;
7760 	}
7761 
7762 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7763 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7764 	if (head_ref_name) {
7765 		s->head_ref_name = strdup(head_ref_name);
7766 		if (s->head_ref_name == NULL) {
7767 			err = got_error_from_errno("strdup");
7768 			goto done;
7769 		}
7770 	}
7771 	s->repo = repo;
7772 
7773 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7774 		err = add_color(&s->colors, "\\$$",
7775 		    TOG_COLOR_TREE_SUBMODULE,
7776 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7777 		if (err)
7778 			goto done;
7779 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7780 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7781 		if (err)
7782 			goto done;
7783 		err = add_color(&s->colors, "/$",
7784 		    TOG_COLOR_TREE_DIRECTORY,
7785 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7786 		if (err)
7787 			goto done;
7788 
7789 		err = add_color(&s->colors, "\\*$",
7790 		    TOG_COLOR_TREE_EXECUTABLE,
7791 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7792 		if (err)
7793 			goto done;
7794 
7795 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7796 		    get_color_value("TOG_COLOR_COMMIT"));
7797 		if (err)
7798 			goto done;
7799 	}
7800 
7801 	view->show = show_tree_view;
7802 	view->input = input_tree_view;
7803 	view->close = close_tree_view;
7804 	view->search_start = search_start_tree_view;
7805 	view->search_next = search_next_tree_view;
7806 done:
7807 	free(commit_id_str);
7808 	if (commit)
7809 		got_object_commit_close(commit);
7810 	if (err) {
7811 		if (view->close == NULL)
7812 			close_tree_view(view);
7813 		view_close(view);
7814 	}
7815 	return err;
7816 }
7817 
7818 static const struct got_error *
7819 close_tree_view(struct tog_view *view)
7820 {
7821 	struct tog_tree_view_state *s = &view->state.tree;
7822 
7823 	free_colors(&s->colors);
7824 	free(s->tree_label);
7825 	s->tree_label = NULL;
7826 	free(s->commit_id);
7827 	s->commit_id = NULL;
7828 	free(s->head_ref_name);
7829 	s->head_ref_name = NULL;
7830 	while (!TAILQ_EMPTY(&s->parents)) {
7831 		struct tog_parent_tree *parent;
7832 		parent = TAILQ_FIRST(&s->parents);
7833 		TAILQ_REMOVE(&s->parents, parent, entry);
7834 		if (parent->tree != s->root)
7835 			got_object_tree_close(parent->tree);
7836 		free(parent);
7837 
7838 	}
7839 	if (s->tree != NULL && s->tree != s->root)
7840 		got_object_tree_close(s->tree);
7841 	if (s->root)
7842 		got_object_tree_close(s->root);
7843 	return NULL;
7844 }
7845 
7846 static const struct got_error *
7847 search_start_tree_view(struct tog_view *view)
7848 {
7849 	struct tog_tree_view_state *s = &view->state.tree;
7850 
7851 	s->matched_entry = NULL;
7852 	return NULL;
7853 }
7854 
7855 static int
7856 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7857 {
7858 	regmatch_t regmatch;
7859 
7860 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7861 	    0) == 0;
7862 }
7863 
7864 static const struct got_error *
7865 search_next_tree_view(struct tog_view *view)
7866 {
7867 	struct tog_tree_view_state *s = &view->state.tree;
7868 	struct got_tree_entry *te = NULL;
7869 
7870 	if (!view->searching) {
7871 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7872 		return NULL;
7873 	}
7874 
7875 	if (s->matched_entry) {
7876 		if (view->searching == TOG_SEARCH_FORWARD) {
7877 			if (s->selected_entry)
7878 				te = got_tree_entry_get_next(s->tree,
7879 				    s->selected_entry);
7880 			else
7881 				te = got_object_tree_get_first_entry(s->tree);
7882 		} else {
7883 			if (s->selected_entry == NULL)
7884 				te = got_object_tree_get_last_entry(s->tree);
7885 			else
7886 				te = got_tree_entry_get_prev(s->tree,
7887 				    s->selected_entry);
7888 		}
7889 	} else {
7890 		if (s->selected_entry)
7891 			te = s->selected_entry;
7892 		else if (view->searching == TOG_SEARCH_FORWARD)
7893 			te = got_object_tree_get_first_entry(s->tree);
7894 		else
7895 			te = got_object_tree_get_last_entry(s->tree);
7896 	}
7897 
7898 	while (1) {
7899 		if (te == NULL) {
7900 			if (s->matched_entry == NULL) {
7901 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7902 				return NULL;
7903 			}
7904 			if (view->searching == TOG_SEARCH_FORWARD)
7905 				te = got_object_tree_get_first_entry(s->tree);
7906 			else
7907 				te = got_object_tree_get_last_entry(s->tree);
7908 		}
7909 
7910 		if (match_tree_entry(te, &view->regex)) {
7911 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7912 			s->matched_entry = te;
7913 			break;
7914 		}
7915 
7916 		if (view->searching == TOG_SEARCH_FORWARD)
7917 			te = got_tree_entry_get_next(s->tree, te);
7918 		else
7919 			te = got_tree_entry_get_prev(s->tree, te);
7920 	}
7921 
7922 	if (s->matched_entry) {
7923 		s->first_displayed_entry = s->matched_entry;
7924 		s->selected = 0;
7925 	}
7926 
7927 	return NULL;
7928 }
7929 
7930 static const struct got_error *
7931 show_tree_view(struct tog_view *view)
7932 {
7933 	const struct got_error *err = NULL;
7934 	struct tog_tree_view_state *s = &view->state.tree;
7935 	char *parent_path;
7936 
7937 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7938 	if (err)
7939 		return err;
7940 
7941 	err = draw_tree_entries(view, parent_path);
7942 	free(parent_path);
7943 
7944 	view_border(view);
7945 	return err;
7946 }
7947 
7948 static const struct got_error *
7949 tree_goto_line(struct tog_view *view, int nlines)
7950 {
7951 	const struct got_error		 *err = NULL;
7952 	struct tog_tree_view_state	 *s = &view->state.tree;
7953 	struct got_tree_entry		**fte, **lte, **ste;
7954 	int				  g, last, first = 1, i = 1;
7955 	int				  root = s->tree == s->root;
7956 	int				  off = root ? 1 : 2;
7957 
7958 	g = view->gline;
7959 	view->gline = 0;
7960 
7961 	if (g == 0)
7962 		g = 1;
7963 	else if (g > got_object_tree_get_nentries(s->tree))
7964 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7965 
7966 	fte = &s->first_displayed_entry;
7967 	lte = &s->last_displayed_entry;
7968 	ste = &s->selected_entry;
7969 
7970 	if (*fte != NULL) {
7971 		first = got_tree_entry_get_index(*fte);
7972 		first += off;  /* account for ".." */
7973 	}
7974 	last = got_tree_entry_get_index(*lte);
7975 	last += off;
7976 
7977 	if (g >= first && g <= last && g - first < nlines) {
7978 		s->selected = g - first;
7979 		return NULL;	/* gline is on the current page */
7980 	}
7981 
7982 	if (*ste != NULL) {
7983 		i = got_tree_entry_get_index(*ste);
7984 		i += off;
7985 	}
7986 
7987 	if (i < g) {
7988 		err = tree_scroll_down(view, g - i);
7989 		if (err)
7990 			return err;
7991 		if (got_tree_entry_get_index(*lte) >=
7992 		    got_object_tree_get_nentries(s->tree) - 1 &&
7993 		    first + s->selected < g &&
7994 		    s->selected < s->ndisplayed - 1) {
7995 			first = got_tree_entry_get_index(*fte);
7996 			first += off;
7997 			s->selected = g - first;
7998 		}
7999 	} else if (i > g)
8000 		tree_scroll_up(s, i - g);
8001 
8002 	if (g < nlines &&
8003 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
8004 		s->selected = g - 1;
8005 
8006 	return NULL;
8007 }
8008 
8009 static const struct got_error *
8010 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
8011 {
8012 	const struct got_error *err = NULL;
8013 	struct tog_tree_view_state *s = &view->state.tree;
8014 	struct got_tree_entry *te;
8015 	int n, nscroll = view->nlines - 3;
8016 
8017 	if (view->gline)
8018 		return tree_goto_line(view, nscroll);
8019 
8020 	switch (ch) {
8021 	case '0':
8022 	case '$':
8023 	case KEY_RIGHT:
8024 	case 'l':
8025 	case KEY_LEFT:
8026 	case 'h':
8027 		horizontal_scroll_input(view, ch);
8028 		break;
8029 	case 'i':
8030 		s->show_ids = !s->show_ids;
8031 		view->count = 0;
8032 		break;
8033 	case 'L':
8034 		view->count = 0;
8035 		if (!s->selected_entry)
8036 			break;
8037 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8038 		break;
8039 	case 'R':
8040 		view->count = 0;
8041 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8042 		break;
8043 	case 'g':
8044 	case '=':
8045 	case KEY_HOME:
8046 		s->selected = 0;
8047 		view->count = 0;
8048 		if (s->tree == s->root)
8049 			s->first_displayed_entry =
8050 			    got_object_tree_get_first_entry(s->tree);
8051 		else
8052 			s->first_displayed_entry = NULL;
8053 		break;
8054 	case 'G':
8055 	case '*':
8056 	case KEY_END: {
8057 		int eos = view->nlines - 3;
8058 
8059 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8060 			--eos;  /* border */
8061 		s->selected = 0;
8062 		view->count = 0;
8063 		te = got_object_tree_get_last_entry(s->tree);
8064 		for (n = 0; n < eos; n++) {
8065 			if (te == NULL) {
8066 				if (s->tree != s->root) {
8067 					s->first_displayed_entry = NULL;
8068 					n++;
8069 				}
8070 				break;
8071 			}
8072 			s->first_displayed_entry = te;
8073 			te = got_tree_entry_get_prev(s->tree, te);
8074 		}
8075 		if (n > 0)
8076 			s->selected = n - 1;
8077 		break;
8078 	}
8079 	case 'k':
8080 	case KEY_UP:
8081 	case CTRL('