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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 };
440 
441 struct tog_blame {
442 	FILE *f;
443 	off_t filesize;
444 	struct tog_blame_line *lines;
445 	int nlines;
446 	off_t *line_offsets;
447 	pthread_t thread;
448 	struct tog_blame_thread_args thread_args;
449 	struct tog_blame_cb_args cb_args;
450 	const char *path;
451 	int *pack_fds;
452 };
453 
454 struct tog_blame_view_state {
455 	int first_displayed_line;
456 	int last_displayed_line;
457 	int selected_line;
458 	int last_diffed_line;
459 	int blame_complete;
460 	int eof;
461 	int done;
462 	struct got_object_id_queue blamed_commits;
463 	struct got_object_qid *blamed_commit;
464 	char *path;
465 	struct got_repository *repo;
466 	struct got_object_id *commit_id;
467 	struct got_object_id *id_to_log;
468 	struct tog_blame blame;
469 	int matched_line;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_parent_tree {
474 	TAILQ_ENTRY(tog_parent_tree) entry;
475 	struct got_tree_object *tree;
476 	struct got_tree_entry *first_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int selected;
479 };
480 
481 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
482 
483 struct tog_tree_view_state {
484 	char *tree_label;
485 	struct got_object_id *commit_id;/* commit which this tree belongs to */
486 	struct got_tree_object *root;	/* the commit's root tree entry */
487 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
488 	struct got_tree_entry *first_displayed_entry;
489 	struct got_tree_entry *last_displayed_entry;
490 	struct got_tree_entry *selected_entry;
491 	int ndisplayed, selected, show_ids;
492 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
493 	char *head_ref_name;
494 	struct got_repository *repo;
495 	struct got_tree_entry *matched_entry;
496 	struct tog_colors colors;
497 };
498 
499 struct tog_reflist_entry {
500 	TAILQ_ENTRY(tog_reflist_entry) entry;
501 	struct got_reference *ref;
502 	int idx;
503 };
504 
505 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
506 
507 struct tog_ref_view_state {
508 	struct tog_reflist_head refs;
509 	struct tog_reflist_entry *first_displayed_entry;
510 	struct tog_reflist_entry *last_displayed_entry;
511 	struct tog_reflist_entry *selected_entry;
512 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
513 	struct got_repository *repo;
514 	struct tog_reflist_entry *matched_entry;
515 	struct tog_colors colors;
516 };
517 
518 struct tog_help_view_state {
519 	FILE			*f;
520 	off_t			*line_offsets;
521 	size_t			 nlines;
522 	int			 lineno;
523 	int			 first_displayed_line;
524 	int			 last_displayed_line;
525 	int			 eof;
526 	int			 matched_line;
527 	int			 selected_line;
528 	int			 all;
529 	enum tog_keymap_type	 type;
530 };
531 
532 #define GENERATE_HELP \
533 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
534 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
535 	KEY_("k C-p Up", "Move cursor or page up one line"), \
536 	KEY_("j C-n Down", "Move cursor or page down one line"), \
537 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
538 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
539 	KEY_("C-u u", "Scroll the view up one half page"), \
540 	KEY_("C-d d", "Scroll the view down one half page"), \
541 	KEY_("g", "Go to line N (default: first line)"), \
542 	KEY_("Home =", "Go to the first line"), \
543 	KEY_("G", "Go to line N (default: last line)"), \
544 	KEY_("End *", "Go to the last line"), \
545 	KEY_("l Right", "Scroll the view right"), \
546 	KEY_("h Left", "Scroll the view left"), \
547 	KEY_("$", "Scroll view to the rightmost position"), \
548 	KEY_("0", "Scroll view to the leftmost position"), \
549 	KEY_("-", "Decrease size of the focussed split"), \
550 	KEY_("+", "Increase size of the focussed split"), \
551 	KEY_("Tab", "Switch focus between views"), \
552 	KEY_("F", "Toggle fullscreen mode"), \
553 	KEY_("/", "Open prompt to enter search term"), \
554 	KEY_("n", "Find next line/token matching the current search term"), \
555 	KEY_("N", "Find previous line/token matching the current search term"),\
556 	KEY_("q", "Quit the focussed view; Quit help screen"), \
557 	KEY_("Q", "Quit tog"), \
558 	\
559 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
560 	KEY_("< ,", "Move cursor up one commit"), \
561 	KEY_("> .", "Move cursor down one commit"), \
562 	KEY_("Enter", "Open diff view of the selected commit"), \
563 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
564 	KEY_("R", "Open ref view of all repository references"), \
565 	KEY_("T", "Display tree view of the repository from the selected" \
566 	    " commit"), \
567 	KEY_("@", "Toggle between displaying author and committer name"), \
568 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
569 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
570 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
571 	\
572 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
573 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
574 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
575 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
576 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
577 	    " data"), \
578 	KEY_("(", "Go to the previous file in the diff"), \
579 	KEY_(")", "Go to the next file in the diff"), \
580 	KEY_("{", "Go to the previous hunk in the diff"), \
581 	KEY_("}", "Go to the next hunk in the diff"), \
582 	KEY_("[", "Decrease the number of context lines"), \
583 	KEY_("]", "Increase the number of context lines"), \
584 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
585 	\
586 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
587 	KEY_("Enter", "Display diff view of the selected line's commit"), \
588 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
589 	KEY_("L", "Open log view for the currently selected annotated line"), \
590 	KEY_("C", "Reload view with the previously blamed commit"), \
591 	KEY_("c", "Reload view with the version of the file found in the" \
592 	    " selected line's commit"), \
593 	KEY_("p", "Reload view with the version of the file found in the" \
594 	    " selected line's parent commit"), \
595 	\
596 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
597 	KEY_("Enter", "Enter selected directory or open blame view of the" \
598 	    " selected file"), \
599 	KEY_("L", "Open log view for the selected entry"), \
600 	KEY_("R", "Open ref view of all repository references"), \
601 	KEY_("i", "Show object IDs for all tree entries"), \
602 	KEY_("Backspace", "Return to the parent directory"), \
603 	\
604 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
605 	KEY_("Enter", "Display log view of the selected reference"), \
606 	KEY_("T", "Display tree view of the selected reference"), \
607 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
608 	KEY_("m", "Toggle display of last modified date for each reference"), \
609 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
610 	KEY_("C-l", "Reload view with all repository references")
611 
612 struct tog_key_map {
613 	const char		*keys;
614 	const char		*info;
615 	enum tog_keymap_type	 type;
616 };
617 
618 /*
619  * We implement two types of views: parent views and child views.
620  *
621  * The 'Tab' key switches focus between a parent view and its child view.
622  * Child views are shown side-by-side to their parent view, provided
623  * there is enough screen estate.
624  *
625  * When a new view is opened from within a parent view, this new view
626  * becomes a child view of the parent view, replacing any existing child.
627  *
628  * When a new view is opened from within a child view, this new view
629  * becomes a parent view which will obscure the views below until the
630  * user quits the new parent view by typing 'q'.
631  *
632  * This list of views contains parent views only.
633  * Child views are only pointed to by their parent view.
634  */
635 TAILQ_HEAD(tog_view_list_head, tog_view);
636 
637 struct tog_view {
638 	TAILQ_ENTRY(tog_view) entry;
639 	WINDOW *window;
640 	PANEL *panel;
641 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
642 	int resized_y, resized_x; /* begin_y/x based on user resizing */
643 	int maxx, x; /* max column and current start column */
644 	int lines, cols; /* copies of LINES and COLS */
645 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
646 	int gline, hiline; /* navigate to and highlight this nG line */
647 	int ch, count; /* current keymap and count prefix */
648 	int resized; /* set when in a resize event */
649 	int focussed; /* Only set on one parent or child view at a time. */
650 	int dying;
651 	struct tog_view *parent;
652 	struct tog_view *child;
653 
654 	/*
655 	 * This flag is initially set on parent views when a new child view
656 	 * is created. It gets toggled when the 'Tab' key switches focus
657 	 * between parent and child.
658 	 * The flag indicates whether focus should be passed on to our child
659 	 * view if this parent view gets picked for focus after another parent
660 	 * view was closed. This prevents child views from losing focus in such
661 	 * situations.
662 	 */
663 	int focus_child;
664 
665 	enum tog_view_mode mode;
666 	/* type-specific state */
667 	enum tog_view_type type;
668 	union {
669 		struct tog_diff_view_state diff;
670 		struct tog_log_view_state log;
671 		struct tog_blame_view_state blame;
672 		struct tog_tree_view_state tree;
673 		struct tog_ref_view_state ref;
674 		struct tog_help_view_state help;
675 	} state;
676 
677 	const struct got_error *(*show)(struct tog_view *);
678 	const struct got_error *(*input)(struct tog_view **,
679 	    struct tog_view *, int);
680 	const struct got_error *(*reset)(struct tog_view *);
681 	const struct got_error *(*resize)(struct tog_view *, int);
682 	const struct got_error *(*close)(struct tog_view *);
683 
684 	const struct got_error *(*search_start)(struct tog_view *);
685 	const struct got_error *(*search_next)(struct tog_view *);
686 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
687 	    int **, int **, int **, int **);
688 	int search_started;
689 	int searching;
690 #define TOG_SEARCH_FORWARD	1
691 #define TOG_SEARCH_BACKWARD	2
692 	int search_next_done;
693 #define TOG_SEARCH_HAVE_MORE	1
694 #define TOG_SEARCH_NO_MORE	2
695 #define TOG_SEARCH_HAVE_NONE	3
696 	regex_t regex;
697 	regmatch_t regmatch;
698 	const char *action;
699 };
700 
701 static const struct got_error *open_diff_view(struct tog_view *,
702     struct got_object_id *, struct got_object_id *,
703     const char *, const char *, int, int, int, struct tog_view *,
704     struct got_repository *);
705 static const struct got_error *show_diff_view(struct tog_view *);
706 static const struct got_error *input_diff_view(struct tog_view **,
707     struct tog_view *, int);
708 static const struct got_error *reset_diff_view(struct tog_view *);
709 static const struct got_error* close_diff_view(struct tog_view *);
710 static const struct got_error *search_start_diff_view(struct tog_view *);
711 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
712     size_t *, int **, int **, int **, int **);
713 static const struct got_error *search_next_view_match(struct tog_view *);
714 
715 static const struct got_error *open_log_view(struct tog_view *,
716     struct got_object_id *, struct got_repository *,
717     const char *, const char *, int);
718 static const struct got_error * show_log_view(struct tog_view *);
719 static const struct got_error *input_log_view(struct tog_view **,
720     struct tog_view *, int);
721 static const struct got_error *resize_log_view(struct tog_view *, int);
722 static const struct got_error *close_log_view(struct tog_view *);
723 static const struct got_error *search_start_log_view(struct tog_view *);
724 static const struct got_error *search_next_log_view(struct tog_view *);
725 
726 static const struct got_error *open_blame_view(struct tog_view *, char *,
727     struct got_object_id *, struct got_repository *);
728 static const struct got_error *show_blame_view(struct tog_view *);
729 static const struct got_error *input_blame_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *reset_blame_view(struct tog_view *);
732 static const struct got_error *close_blame_view(struct tog_view *);
733 static const struct got_error *search_start_blame_view(struct tog_view *);
734 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
735     size_t *, int **, int **, int **, int **);
736 
737 static const struct got_error *open_tree_view(struct tog_view *,
738     struct got_object_id *, const char *, struct got_repository *);
739 static const struct got_error *show_tree_view(struct tog_view *);
740 static const struct got_error *input_tree_view(struct tog_view **,
741     struct tog_view *, int);
742 static const struct got_error *close_tree_view(struct tog_view *);
743 static const struct got_error *search_start_tree_view(struct tog_view *);
744 static const struct got_error *search_next_tree_view(struct tog_view *);
745 
746 static const struct got_error *open_ref_view(struct tog_view *,
747     struct got_repository *);
748 static const struct got_error *show_ref_view(struct tog_view *);
749 static const struct got_error *input_ref_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *close_ref_view(struct tog_view *);
752 static const struct got_error *search_start_ref_view(struct tog_view *);
753 static const struct got_error *search_next_ref_view(struct tog_view *);
754 
755 static const struct got_error *open_help_view(struct tog_view *,
756     struct tog_view *);
757 static const struct got_error *show_help_view(struct tog_view *);
758 static const struct got_error *input_help_view(struct tog_view **,
759     struct tog_view *, int);
760 static const struct got_error *reset_help_view(struct tog_view *);
761 static const struct got_error* close_help_view(struct tog_view *);
762 static const struct got_error *search_start_help_view(struct tog_view *);
763 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
764     size_t *, int **, int **, int **, int **);
765 
766 static volatile sig_atomic_t tog_sigwinch_received;
767 static volatile sig_atomic_t tog_sigpipe_received;
768 static volatile sig_atomic_t tog_sigcont_received;
769 static volatile sig_atomic_t tog_sigint_received;
770 static volatile sig_atomic_t tog_sigterm_received;
771 
772 static void
773 tog_sigwinch(int signo)
774 {
775 	tog_sigwinch_received = 1;
776 }
777 
778 static void
779 tog_sigpipe(int signo)
780 {
781 	tog_sigpipe_received = 1;
782 }
783 
784 static void
785 tog_sigcont(int signo)
786 {
787 	tog_sigcont_received = 1;
788 }
789 
790 static void
791 tog_sigint(int signo)
792 {
793 	tog_sigint_received = 1;
794 }
795 
796 static void
797 tog_sigterm(int signo)
798 {
799 	tog_sigterm_received = 1;
800 }
801 
802 static int
803 tog_fatal_signal_received(void)
804 {
805 	return (tog_sigpipe_received ||
806 	    tog_sigint_received || tog_sigterm_received);
807 }
808 
809 static const struct got_error *
810 view_close(struct tog_view *view)
811 {
812 	const struct got_error *err = NULL, *child_err = NULL;
813 
814 	if (view->child) {
815 		child_err = view_close(view->child);
816 		view->child = NULL;
817 	}
818 	if (view->close)
819 		err = view->close(view);
820 	if (view->panel)
821 		del_panel(view->panel);
822 	if (view->window)
823 		delwin(view->window);
824 	free(view);
825 	return err ? err : child_err;
826 }
827 
828 static struct tog_view *
829 view_open(int nlines, int ncols, int begin_y, int begin_x,
830     enum tog_view_type type)
831 {
832 	struct tog_view *view = calloc(1, sizeof(*view));
833 
834 	if (view == NULL)
835 		return NULL;
836 
837 	view->type = type;
838 	view->lines = LINES;
839 	view->cols = COLS;
840 	view->nlines = nlines ? nlines : LINES - begin_y;
841 	view->ncols = ncols ? ncols : COLS - begin_x;
842 	view->begin_y = begin_y;
843 	view->begin_x = begin_x;
844 	view->window = newwin(nlines, ncols, begin_y, begin_x);
845 	if (view->window == NULL) {
846 		view_close(view);
847 		return NULL;
848 	}
849 	view->panel = new_panel(view->window);
850 	if (view->panel == NULL ||
851 	    set_panel_userptr(view->panel, view) != OK) {
852 		view_close(view);
853 		return NULL;
854 	}
855 
856 	keypad(view->window, TRUE);
857 	return view;
858 }
859 
860 static int
861 view_split_begin_x(int begin_x)
862 {
863 	if (begin_x > 0 || COLS < 120)
864 		return 0;
865 	return (COLS - MAX(COLS / 2, 80));
866 }
867 
868 /* XXX Stub till we decide what to do. */
869 static int
870 view_split_begin_y(int lines)
871 {
872 	return lines * HSPLIT_SCALE;
873 }
874 
875 static const struct got_error *view_resize(struct tog_view *);
876 
877 static const struct got_error *
878 view_splitscreen(struct tog_view *view)
879 {
880 	const struct got_error *err = NULL;
881 
882 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
883 		if (view->resized_y && view->resized_y < view->lines)
884 			view->begin_y = view->resized_y;
885 		else
886 			view->begin_y = view_split_begin_y(view->nlines);
887 		view->begin_x = 0;
888 	} else if (!view->resized) {
889 		if (view->resized_x && view->resized_x < view->cols - 1 &&
890 		    view->cols > 119)
891 			view->begin_x = view->resized_x;
892 		else
893 			view->begin_x = view_split_begin_x(0);
894 		view->begin_y = 0;
895 	}
896 	view->nlines = LINES - view->begin_y;
897 	view->ncols = COLS - view->begin_x;
898 	view->lines = LINES;
899 	view->cols = COLS;
900 	err = view_resize(view);
901 	if (err)
902 		return err;
903 
904 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
905 		view->parent->nlines = view->begin_y;
906 
907 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
908 		return got_error_from_errno("mvwin");
909 
910 	return NULL;
911 }
912 
913 static const struct got_error *
914 view_fullscreen(struct tog_view *view)
915 {
916 	const struct got_error *err = NULL;
917 
918 	view->begin_x = 0;
919 	view->begin_y = view->resized ? view->begin_y : 0;
920 	view->nlines = view->resized ? view->nlines : LINES;
921 	view->ncols = COLS;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 	err = view_resize(view);
925 	if (err)
926 		return err;
927 
928 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
929 		return got_error_from_errno("mvwin");
930 
931 	return NULL;
932 }
933 
934 static int
935 view_is_parent_view(struct tog_view *view)
936 {
937 	return view->parent == NULL;
938 }
939 
940 static int
941 view_is_splitscreen(struct tog_view *view)
942 {
943 	return view->begin_x > 0 || view->begin_y > 0;
944 }
945 
946 static int
947 view_is_fullscreen(struct tog_view *view)
948 {
949 	return view->nlines == LINES && view->ncols == COLS;
950 }
951 
952 static int
953 view_is_hsplit_top(struct tog_view *view)
954 {
955 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
956 	    view_is_splitscreen(view->child);
957 }
958 
959 static void
960 view_border(struct tog_view *view)
961 {
962 	PANEL *panel;
963 	const struct tog_view *view_above;
964 
965 	if (view->parent)
966 		return view_border(view->parent);
967 
968 	panel = panel_above(view->panel);
969 	if (panel == NULL)
970 		return;
971 
972 	view_above = panel_userptr(panel);
973 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
974 		mvwhline(view->window, view_above->begin_y - 1,
975 		    view->begin_x, got_locale_is_utf8() ?
976 		    ACS_HLINE : '-', view->ncols);
977 	else
978 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
979 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
980 }
981 
982 static const struct got_error *view_init_hsplit(struct tog_view *, int);
983 static const struct got_error *request_log_commits(struct tog_view *);
984 static const struct got_error *offset_selection_down(struct tog_view *);
985 static void offset_selection_up(struct tog_view *);
986 static void view_get_split(struct tog_view *, int *, int *);
987 
988 static const struct got_error *
989 view_resize(struct tog_view *view)
990 {
991 	const struct got_error	*err = NULL;
992 	int			 dif, nlines, ncols;
993 
994 	dif = LINES - view->lines;  /* line difference */
995 
996 	if (view->lines > LINES)
997 		nlines = view->nlines - (view->lines - LINES);
998 	else
999 		nlines = view->nlines + (LINES - view->lines);
1000 	if (view->cols > COLS)
1001 		ncols = view->ncols - (view->cols - COLS);
1002 	else
1003 		ncols = view->ncols + (COLS - view->cols);
1004 
1005 	if (view->child) {
1006 		int hs = view->child->begin_y;
1007 
1008 		if (!view_is_fullscreen(view))
1009 			view->child->begin_x = view_split_begin_x(view->begin_x);
1010 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1011 		    view->child->begin_x == 0) {
1012 			ncols = COLS;
1013 
1014 			view_fullscreen(view->child);
1015 			if (view->child->focussed)
1016 				show_panel(view->child->panel);
1017 			else
1018 				show_panel(view->panel);
1019 		} else {
1020 			ncols = view->child->begin_x;
1021 
1022 			view_splitscreen(view->child);
1023 			show_panel(view->child->panel);
1024 		}
1025 		/*
1026 		 * XXX This is ugly and needs to be moved into the above
1027 		 * logic but "works" for now and my attempts at moving it
1028 		 * break either 'tab' or 'F' key maps in horizontal splits.
1029 		 */
1030 		if (hs) {
1031 			err = view_splitscreen(view->child);
1032 			if (err)
1033 				return err;
1034 			if (dif < 0) { /* top split decreased */
1035 				err = offset_selection_down(view);
1036 				if (err)
1037 					return err;
1038 			}
1039 			view_border(view);
1040 			update_panels();
1041 			doupdate();
1042 			show_panel(view->child->panel);
1043 			nlines = view->nlines;
1044 		}
1045 	} else if (view->parent == NULL)
1046 		ncols = COLS;
1047 
1048 	if (view->resize && dif > 0) {
1049 		err = view->resize(view, dif);
1050 		if (err)
1051 			return err;
1052 	}
1053 
1054 	if (wresize(view->window, nlines, ncols) == ERR)
1055 		return got_error_from_errno("wresize");
1056 	if (replace_panel(view->panel, view->window) == ERR)
1057 		return got_error_from_errno("replace_panel");
1058 	wclear(view->window);
1059 
1060 	view->nlines = nlines;
1061 	view->ncols = ncols;
1062 	view->lines = LINES;
1063 	view->cols = COLS;
1064 
1065 	return NULL;
1066 }
1067 
1068 static const struct got_error *
1069 resize_log_view(struct tog_view *view, int increase)
1070 {
1071 	struct tog_log_view_state	*s = &view->state.log;
1072 	const struct got_error		*err = NULL;
1073 	int				 n = 0;
1074 
1075 	if (s->selected_entry)
1076 		n = s->selected_entry->idx + view->lines - s->selected;
1077 
1078 	/*
1079 	 * Request commits to account for the increased
1080 	 * height so we have enough to populate the view.
1081 	 */
1082 	if (s->commits->ncommits < n) {
1083 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1084 		err = request_log_commits(view);
1085 	}
1086 
1087 	return err;
1088 }
1089 
1090 static void
1091 view_adjust_offset(struct tog_view *view, int n)
1092 {
1093 	if (n == 0)
1094 		return;
1095 
1096 	if (view->parent && view->parent->offset) {
1097 		if (view->parent->offset + n >= 0)
1098 			view->parent->offset += n;
1099 		else
1100 			view->parent->offset = 0;
1101 	} else if (view->offset) {
1102 		if (view->offset - n >= 0)
1103 			view->offset -= n;
1104 		else
1105 			view->offset = 0;
1106 	}
1107 }
1108 
1109 static const struct got_error *
1110 view_resize_split(struct tog_view *view, int resize)
1111 {
1112 	const struct got_error	*err = NULL;
1113 	struct tog_view		*v = NULL;
1114 
1115 	if (view->parent)
1116 		v = view->parent;
1117 	else
1118 		v = view;
1119 
1120 	if (!v->child || !view_is_splitscreen(v->child))
1121 		return NULL;
1122 
1123 	v->resized = v->child->resized = resize;  /* lock for resize event */
1124 
1125 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1126 		if (v->child->resized_y)
1127 			v->child->begin_y = v->child->resized_y;
1128 		if (view->parent)
1129 			v->child->begin_y -= resize;
1130 		else
1131 			v->child->begin_y += resize;
1132 		if (v->child->begin_y < 3) {
1133 			view->count = 0;
1134 			v->child->begin_y = 3;
1135 		} else if (v->child->begin_y > LINES - 1) {
1136 			view->count = 0;
1137 			v->child->begin_y = LINES - 1;
1138 		}
1139 		v->ncols = COLS;
1140 		v->child->ncols = COLS;
1141 		view_adjust_offset(view, resize);
1142 		err = view_init_hsplit(v, v->child->begin_y);
1143 		if (err)
1144 			return err;
1145 		v->child->resized_y = v->child->begin_y;
1146 	} else {
1147 		if (v->child->resized_x)
1148 			v->child->begin_x = v->child->resized_x;
1149 		if (view->parent)
1150 			v->child->begin_x -= resize;
1151 		else
1152 			v->child->begin_x += resize;
1153 		if (v->child->begin_x < 11) {
1154 			view->count = 0;
1155 			v->child->begin_x = 11;
1156 		} else if (v->child->begin_x > COLS - 1) {
1157 			view->count = 0;
1158 			v->child->begin_x = COLS - 1;
1159 		}
1160 		v->child->resized_x = v->child->begin_x;
1161 	}
1162 
1163 	v->child->mode = v->mode;
1164 	v->child->nlines = v->lines - v->child->begin_y;
1165 	v->child->ncols = v->cols - v->child->begin_x;
1166 	v->focus_child = 1;
1167 
1168 	err = view_fullscreen(v);
1169 	if (err)
1170 		return err;
1171 	err = view_splitscreen(v->child);
1172 	if (err)
1173 		return err;
1174 
1175 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1176 		err = offset_selection_down(v->child);
1177 		if (err)
1178 			return err;
1179 	}
1180 
1181 	if (v->resize)
1182 		err = v->resize(v, 0);
1183 	else if (v->child->resize)
1184 		err = v->child->resize(v->child, 0);
1185 
1186 	v->resized = v->child->resized = 0;
1187 
1188 	return err;
1189 }
1190 
1191 static void
1192 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1193 {
1194 	struct tog_view *v = src->child ? src->child : src;
1195 
1196 	dst->resized_x = v->resized_x;
1197 	dst->resized_y = v->resized_y;
1198 }
1199 
1200 static const struct got_error *
1201 view_close_child(struct tog_view *view)
1202 {
1203 	const struct got_error *err = NULL;
1204 
1205 	if (view->child == NULL)
1206 		return NULL;
1207 
1208 	err = view_close(view->child);
1209 	view->child = NULL;
1210 	return err;
1211 }
1212 
1213 static const struct got_error *
1214 view_set_child(struct tog_view *view, struct tog_view *child)
1215 {
1216 	const struct got_error *err = NULL;
1217 
1218 	view->child = child;
1219 	child->parent = view;
1220 
1221 	err = view_resize(view);
1222 	if (err)
1223 		return err;
1224 
1225 	if (view->child->resized_x || view->child->resized_y)
1226 		err = view_resize_split(view, 0);
1227 
1228 	return err;
1229 }
1230 
1231 static const struct got_error *view_dispatch_request(struct tog_view **,
1232     struct tog_view *, enum tog_view_type, int, int);
1233 
1234 static const struct got_error *
1235 view_request_new(struct tog_view **requested, struct tog_view *view,
1236     enum tog_view_type request)
1237 {
1238 	struct tog_view		*new_view = NULL;
1239 	const struct got_error	*err;
1240 	int			 y = 0, x = 0;
1241 
1242 	*requested = NULL;
1243 
1244 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1245 		view_get_split(view, &y, &x);
1246 
1247 	err = view_dispatch_request(&new_view, view, request, y, x);
1248 	if (err)
1249 		return err;
1250 
1251 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1252 	    request != TOG_VIEW_HELP) {
1253 		err = view_init_hsplit(view, y);
1254 		if (err)
1255 			return err;
1256 	}
1257 
1258 	view->focussed = 0;
1259 	new_view->focussed = 1;
1260 	new_view->mode = view->mode;
1261 	new_view->nlines = request == TOG_VIEW_HELP ?
1262 	    view->lines : view->lines - y;
1263 
1264 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1265 		view_transfer_size(new_view, view);
1266 		err = view_close_child(view);
1267 		if (err)
1268 			return err;
1269 		err = view_set_child(view, new_view);
1270 		if (err)
1271 			return err;
1272 		view->focus_child = 1;
1273 	} else
1274 		*requested = new_view;
1275 
1276 	return NULL;
1277 }
1278 
1279 static void
1280 tog_resizeterm(void)
1281 {
1282 	int cols, lines;
1283 	struct winsize size;
1284 
1285 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1286 		cols = 80;     /* Default */
1287 		lines = 24;
1288 	} else {
1289 		cols = size.ws_col;
1290 		lines = size.ws_row;
1291 	}
1292 	resize_term(lines, cols);
1293 }
1294 
1295 static const struct got_error *
1296 view_search_start(struct tog_view *view, int fast_refresh)
1297 {
1298 	const struct got_error *err = NULL;
1299 	struct tog_view *v = view;
1300 	char pattern[1024];
1301 	int ret;
1302 
1303 	if (view->search_started) {
1304 		regfree(&view->regex);
1305 		view->searching = 0;
1306 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1307 	}
1308 	view->search_started = 0;
1309 
1310 	if (view->nlines < 1)
1311 		return NULL;
1312 
1313 	if (view_is_hsplit_top(view))
1314 		v = view->child;
1315 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1316 		v = view->parent;
1317 
1318 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1319 	wclrtoeol(v->window);
1320 
1321 	nodelay(v->window, FALSE);  /* block for search term input */
1322 	nocbreak();
1323 	echo();
1324 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1325 	wrefresh(v->window);
1326 	cbreak();
1327 	noecho();
1328 	nodelay(v->window, TRUE);
1329 	if (!fast_refresh)
1330 		halfdelay(10);
1331 	if (ret == ERR)
1332 		return NULL;
1333 
1334 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1335 		err = view->search_start(view);
1336 		if (err) {
1337 			regfree(&view->regex);
1338 			return err;
1339 		}
1340 		view->search_started = 1;
1341 		view->searching = TOG_SEARCH_FORWARD;
1342 		view->search_next_done = 0;
1343 		view->search_next(view);
1344 	}
1345 
1346 	return NULL;
1347 }
1348 
1349 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1350 static const struct got_error *
1351 switch_split(struct tog_view *view)
1352 {
1353 	const struct got_error	*err = NULL;
1354 	struct tog_view		*v = NULL;
1355 
1356 	if (view->parent)
1357 		v = view->parent;
1358 	else
1359 		v = view;
1360 
1361 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1362 		v->mode = TOG_VIEW_SPLIT_VERT;
1363 	else
1364 		v->mode = TOG_VIEW_SPLIT_HRZN;
1365 
1366 	if (!v->child)
1367 		return NULL;
1368 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1369 		v->mode = TOG_VIEW_SPLIT_NONE;
1370 
1371 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1372 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1373 		v->child->begin_y = v->child->resized_y;
1374 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1375 		v->child->begin_x = v->child->resized_x;
1376 
1377 
1378 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1379 		v->ncols = COLS;
1380 		v->child->ncols = COLS;
1381 		v->child->nscrolled = LINES - v->child->nlines;
1382 
1383 		err = view_init_hsplit(v, v->child->begin_y);
1384 		if (err)
1385 			return err;
1386 	}
1387 	v->child->mode = v->mode;
1388 	v->child->nlines = v->lines - v->child->begin_y;
1389 	v->focus_child = 1;
1390 
1391 	err = view_fullscreen(v);
1392 	if (err)
1393 		return err;
1394 	err = view_splitscreen(v->child);
1395 	if (err)
1396 		return err;
1397 
1398 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1399 		v->mode = TOG_VIEW_SPLIT_VERT;
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1401 		err = offset_selection_down(v);
1402 		if (err)
1403 			return err;
1404 		err = offset_selection_down(v->child);
1405 		if (err)
1406 			return err;
1407 	} else {
1408 		offset_selection_up(v);
1409 		offset_selection_up(v->child);
1410 	}
1411 	if (v->resize)
1412 		err = v->resize(v, 0);
1413 	else if (v->child->resize)
1414 		err = v->child->resize(v->child, 0);
1415 
1416 	return err;
1417 }
1418 
1419 /*
1420  * Compute view->count from numeric input. Assign total to view->count and
1421  * return first non-numeric key entered.
1422  */
1423 static int
1424 get_compound_key(struct tog_view *view, int c)
1425 {
1426 	struct tog_view	*v = view;
1427 	int		 x, n = 0;
1428 
1429 	if (view_is_hsplit_top(view))
1430 		v = view->child;
1431 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1432 		v = view->parent;
1433 
1434 	view->count = 0;
1435 	cbreak();  /* block for input */
1436 	nodelay(view->window, FALSE);
1437 	wmove(v->window, v->nlines - 1, 0);
1438 	wclrtoeol(v->window);
1439 	waddch(v->window, ':');
1440 
1441 	do {
1442 		x = getcurx(v->window);
1443 		if (x != ERR && x < view->ncols) {
1444 			waddch(v->window, c);
1445 			wrefresh(v->window);
1446 		}
1447 
1448 		/*
1449 		 * Don't overflow. Max valid request should be the greatest
1450 		 * between the longest and total lines; cap at 10 million.
1451 		 */
1452 		if (n >= 9999999)
1453 			n = 9999999;
1454 		else
1455 			n = n * 10 + (c - '0');
1456 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1457 
1458 	if (c == 'G' || c == 'g') {	/* nG key map */
1459 		view->gline = view->hiline = n;
1460 		n = 0;
1461 		c = 0;
1462 	}
1463 
1464 	/* Massage excessive or inapplicable values at the input handler. */
1465 	view->count = n;
1466 
1467 	return c;
1468 }
1469 
1470 static void
1471 action_report(struct tog_view *view)
1472 {
1473 	struct tog_view *v = view;
1474 
1475 	if (view_is_hsplit_top(view))
1476 		v = view->child;
1477 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1478 		v = view->parent;
1479 
1480 	wmove(v->window, v->nlines - 1, 0);
1481 	wclrtoeol(v->window);
1482 	wprintw(v->window, ":%s", view->action);
1483 	wrefresh(v->window);
1484 
1485 	/*
1486 	 * Clear action status report. Only clear in blame view
1487 	 * once annotating is complete, otherwise it's too fast.
1488 	 */
1489 	if (view->type == TOG_VIEW_BLAME) {
1490 		if (view->state.blame.blame_complete)
1491 			view->action = NULL;
1492 	} else
1493 		view->action = NULL;
1494 }
1495 
1496 static const struct got_error *
1497 view_input(struct tog_view **new, int *done, struct tog_view *view,
1498     struct tog_view_list_head *views, int fast_refresh)
1499 {
1500 	const struct got_error *err = NULL;
1501 	struct tog_view *v;
1502 	int ch, errcode;
1503 
1504 	*new = NULL;
1505 
1506 	if (view->action)
1507 		action_report(view);
1508 
1509 	/* Clear "no matches" indicator. */
1510 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1511 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1512 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1513 		view->count = 0;
1514 	}
1515 
1516 	if (view->searching && !view->search_next_done) {
1517 		errcode = pthread_mutex_unlock(&tog_mutex);
1518 		if (errcode)
1519 			return got_error_set_errno(errcode,
1520 			    "pthread_mutex_unlock");
1521 		sched_yield();
1522 		errcode = pthread_mutex_lock(&tog_mutex);
1523 		if (errcode)
1524 			return got_error_set_errno(errcode,
1525 			    "pthread_mutex_lock");
1526 		view->search_next(view);
1527 		return NULL;
1528 	}
1529 
1530 	/* Allow threads to make progress while we are waiting for input. */
1531 	errcode = pthread_mutex_unlock(&tog_mutex);
1532 	if (errcode)
1533 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1534 	/* If we have an unfinished count, let C-g or backspace abort. */
1535 	if (view->count && --view->count) {
1536 		cbreak();
1537 		nodelay(view->window, TRUE);
1538 		ch = wgetch(view->window);
1539 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1540 			view->count = 0;
1541 		else
1542 			ch = view->ch;
1543 	} else {
1544 		ch = wgetch(view->window);
1545 		if (ch >= '1' && ch  <= '9')
1546 			view->ch = ch = get_compound_key(view, ch);
1547 	}
1548 	if (view->hiline && ch != ERR && ch != 0)
1549 		view->hiline = 0;  /* key pressed, clear line highlight */
1550 	nodelay(view->window, TRUE);
1551 	errcode = pthread_mutex_lock(&tog_mutex);
1552 	if (errcode)
1553 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1554 
1555 	if (tog_sigwinch_received || tog_sigcont_received) {
1556 		tog_resizeterm();
1557 		tog_sigwinch_received = 0;
1558 		tog_sigcont_received = 0;
1559 		TAILQ_FOREACH(v, views, entry) {
1560 			err = view_resize(v);
1561 			if (err)
1562 				return err;
1563 			err = v->input(new, v, KEY_RESIZE);
1564 			if (err)
1565 				return err;
1566 			if (v->child) {
1567 				err = view_resize(v->child);
1568 				if (err)
1569 					return err;
1570 				err = v->child->input(new, v->child,
1571 				    KEY_RESIZE);
1572 				if (err)
1573 					return err;
1574 				if (v->child->resized_x || v->child->resized_y) {
1575 					err = view_resize_split(v, 0);
1576 					if (err)
1577 						return err;
1578 				}
1579 			}
1580 		}
1581 	}
1582 
1583 	switch (ch) {
1584 	case '?':
1585 	case 'H':
1586 	case KEY_F(1):
1587 		if (view->type == TOG_VIEW_HELP)
1588 			err = view->reset(view);
1589 		else
1590 			err = view_request_new(new, view, TOG_VIEW_HELP);
1591 		break;
1592 	case '\t':
1593 		view->count = 0;
1594 		if (view->child) {
1595 			view->focussed = 0;
1596 			view->child->focussed = 1;
1597 			view->focus_child = 1;
1598 		} else if (view->parent) {
1599 			view->focussed = 0;
1600 			view->parent->focussed = 1;
1601 			view->parent->focus_child = 0;
1602 			if (!view_is_splitscreen(view)) {
1603 				if (view->parent->resize) {
1604 					err = view->parent->resize(view->parent,
1605 					    0);
1606 					if (err)
1607 						return err;
1608 				}
1609 				offset_selection_up(view->parent);
1610 				err = view_fullscreen(view->parent);
1611 				if (err)
1612 					return err;
1613 			}
1614 		}
1615 		break;
1616 	case 'q':
1617 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1618 			if (view->parent->resize) {
1619 				/* might need more commits to fill fullscreen */
1620 				err = view->parent->resize(view->parent, 0);
1621 				if (err)
1622 					break;
1623 			}
1624 			offset_selection_up(view->parent);
1625 		}
1626 		err = view->input(new, view, ch);
1627 		view->dying = 1;
1628 		break;
1629 	case 'Q':
1630 		*done = 1;
1631 		break;
1632 	case 'F':
1633 		view->count = 0;
1634 		if (view_is_parent_view(view)) {
1635 			if (view->child == NULL)
1636 				break;
1637 			if (view_is_splitscreen(view->child)) {
1638 				view->focussed = 0;
1639 				view->child->focussed = 1;
1640 				err = view_fullscreen(view->child);
1641 			} else {
1642 				err = view_splitscreen(view->child);
1643 				if (!err)
1644 					err = view_resize_split(view, 0);
1645 			}
1646 			if (err)
1647 				break;
1648 			err = view->child->input(new, view->child,
1649 			    KEY_RESIZE);
1650 		} else {
1651 			if (view_is_splitscreen(view)) {
1652 				view->parent->focussed = 0;
1653 				view->focussed = 1;
1654 				err = view_fullscreen(view);
1655 			} else {
1656 				err = view_splitscreen(view);
1657 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1658 					err = view_resize(view->parent);
1659 				if (!err)
1660 					err = view_resize_split(view, 0);
1661 			}
1662 			if (err)
1663 				break;
1664 			err = view->input(new, view, KEY_RESIZE);
1665 		}
1666 		if (err)
1667 			break;
1668 		if (view->resize) {
1669 			err = view->resize(view, 0);
1670 			if (err)
1671 				break;
1672 		}
1673 		if (view->parent)
1674 			err = offset_selection_down(view->parent);
1675 		if (!err)
1676 			err = offset_selection_down(view);
1677 		break;
1678 	case 'S':
1679 		view->count = 0;
1680 		err = switch_split(view);
1681 		break;
1682 	case '-':
1683 		err = view_resize_split(view, -1);
1684 		break;
1685 	case '+':
1686 		err = view_resize_split(view, 1);
1687 		break;
1688 	case KEY_RESIZE:
1689 		break;
1690 	case '/':
1691 		view->count = 0;
1692 		if (view->search_start)
1693 			view_search_start(view, fast_refresh);
1694 		else
1695 			err = view->input(new, view, ch);
1696 		break;
1697 	case 'N':
1698 	case 'n':
1699 		if (view->search_started && view->search_next) {
1700 			view->searching = (ch == 'n' ?
1701 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1702 			view->search_next_done = 0;
1703 			view->search_next(view);
1704 		} else
1705 			err = view->input(new, view, ch);
1706 		break;
1707 	case 'A':
1708 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1709 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1710 			view->action = "Patience diff algorithm";
1711 		} else {
1712 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1713 			view->action = "Myers diff algorithm";
1714 		}
1715 		TAILQ_FOREACH(v, views, entry) {
1716 			if (v->reset) {
1717 				err = v->reset(v);
1718 				if (err)
1719 					return err;
1720 			}
1721 			if (v->child && v->child->reset) {
1722 				err = v->child->reset(v->child);
1723 				if (err)
1724 					return err;
1725 			}
1726 		}
1727 		break;
1728 	default:
1729 		err = view->input(new, view, ch);
1730 		break;
1731 	}
1732 
1733 	return err;
1734 }
1735 
1736 static int
1737 view_needs_focus_indication(struct tog_view *view)
1738 {
1739 	if (view_is_parent_view(view)) {
1740 		if (view->child == NULL || view->child->focussed)
1741 			return 0;
1742 		if (!view_is_splitscreen(view->child))
1743 			return 0;
1744 	} else if (!view_is_splitscreen(view))
1745 		return 0;
1746 
1747 	return view->focussed;
1748 }
1749 
1750 static const struct got_error *
1751 view_loop(struct tog_view *view)
1752 {
1753 	const struct got_error *err = NULL;
1754 	struct tog_view_list_head views;
1755 	struct tog_view *new_view;
1756 	char *mode;
1757 	int fast_refresh = 10;
1758 	int done = 0, errcode;
1759 
1760 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1761 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1762 		view->mode = TOG_VIEW_SPLIT_VERT;
1763 	else
1764 		view->mode = TOG_VIEW_SPLIT_HRZN;
1765 
1766 	errcode = pthread_mutex_lock(&tog_mutex);
1767 	if (errcode)
1768 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1769 
1770 	TAILQ_INIT(&views);
1771 	TAILQ_INSERT_HEAD(&views, view, entry);
1772 
1773 	view->focussed = 1;
1774 	err = view->show(view);
1775 	if (err)
1776 		return err;
1777 	update_panels();
1778 	doupdate();
1779 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1780 	    !tog_fatal_signal_received()) {
1781 		/* Refresh fast during initialization, then become slower. */
1782 		if (fast_refresh && --fast_refresh == 0)
1783 			halfdelay(10); /* switch to once per second */
1784 
1785 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1786 		if (err)
1787 			break;
1788 
1789 		if (view->dying && view == TAILQ_FIRST(&views) &&
1790 		    TAILQ_NEXT(view, entry) == NULL)
1791 			done = 1;
1792 		if (done) {
1793 			struct tog_view *v;
1794 
1795 			/*
1796 			 * When we quit, scroll the screen up a single line
1797 			 * so we don't lose any information.
1798 			 */
1799 			TAILQ_FOREACH(v, &views, entry) {
1800 				wmove(v->window, 0, 0);
1801 				wdeleteln(v->window);
1802 				wnoutrefresh(v->window);
1803 				if (v->child && !view_is_fullscreen(v)) {
1804 					wmove(v->child->window, 0, 0);
1805 					wdeleteln(v->child->window);
1806 					wnoutrefresh(v->child->window);
1807 				}
1808 			}
1809 			doupdate();
1810 		}
1811 
1812 		if (view->dying) {
1813 			struct tog_view *v, *prev = NULL;
1814 
1815 			if (view_is_parent_view(view))
1816 				prev = TAILQ_PREV(view, tog_view_list_head,
1817 				    entry);
1818 			else if (view->parent)
1819 				prev = view->parent;
1820 
1821 			if (view->parent) {
1822 				view->parent->child = NULL;
1823 				view->parent->focus_child = 0;
1824 				/* Restore fullscreen line height. */
1825 				view->parent->nlines = view->parent->lines;
1826 				err = view_resize(view->parent);
1827 				if (err)
1828 					break;
1829 				/* Make resized splits persist. */
1830 				view_transfer_size(view->parent, view);
1831 			} else
1832 				TAILQ_REMOVE(&views, view, entry);
1833 
1834 			err = view_close(view);
1835 			if (err)
1836 				goto done;
1837 
1838 			view = NULL;
1839 			TAILQ_FOREACH(v, &views, entry) {
1840 				if (v->focussed)
1841 					break;
1842 			}
1843 			if (view == NULL && new_view == NULL) {
1844 				/* No view has focus. Try to pick one. */
1845 				if (prev)
1846 					view = prev;
1847 				else if (!TAILQ_EMPTY(&views)) {
1848 					view = TAILQ_LAST(&views,
1849 					    tog_view_list_head);
1850 				}
1851 				if (view) {
1852 					if (view->focus_child) {
1853 						view->child->focussed = 1;
1854 						view = view->child;
1855 					} else
1856 						view->focussed = 1;
1857 				}
1858 			}
1859 		}
1860 		if (new_view) {
1861 			struct tog_view *v, *t;
1862 			/* Only allow one parent view per type. */
1863 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1864 				if (v->type != new_view->type)
1865 					continue;
1866 				TAILQ_REMOVE(&views, v, entry);
1867 				err = view_close(v);
1868 				if (err)
1869 					goto done;
1870 				break;
1871 			}
1872 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1873 			view = new_view;
1874 		}
1875 		if (view && !done) {
1876 			if (view_is_parent_view(view)) {
1877 				if (view->child && view->child->focussed)
1878 					view = view->child;
1879 			} else {
1880 				if (view->parent && view->parent->focussed)
1881 					view = view->parent;
1882 			}
1883 			show_panel(view->panel);
1884 			if (view->child && view_is_splitscreen(view->child))
1885 				show_panel(view->child->panel);
1886 			if (view->parent && view_is_splitscreen(view)) {
1887 				err = view->parent->show(view->parent);
1888 				if (err)
1889 					goto done;
1890 			}
1891 			err = view->show(view);
1892 			if (err)
1893 				goto done;
1894 			if (view->child) {
1895 				err = view->child->show(view->child);
1896 				if (err)
1897 					goto done;
1898 			}
1899 			update_panels();
1900 			doupdate();
1901 		}
1902 	}
1903 done:
1904 	while (!TAILQ_EMPTY(&views)) {
1905 		const struct got_error *close_err;
1906 		view = TAILQ_FIRST(&views);
1907 		TAILQ_REMOVE(&views, view, entry);
1908 		close_err = view_close(view);
1909 		if (close_err && err == NULL)
1910 			err = close_err;
1911 	}
1912 
1913 	errcode = pthread_mutex_unlock(&tog_mutex);
1914 	if (errcode && err == NULL)
1915 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1916 
1917 	return err;
1918 }
1919 
1920 __dead static void
1921 usage_log(void)
1922 {
1923 	endwin();
1924 	fprintf(stderr,
1925 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1926 	    getprogname());
1927 	exit(1);
1928 }
1929 
1930 /* Create newly allocated wide-character string equivalent to a byte string. */
1931 static const struct got_error *
1932 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1933 {
1934 	char *vis = NULL;
1935 	const struct got_error *err = NULL;
1936 
1937 	*ws = NULL;
1938 	*wlen = mbstowcs(NULL, s, 0);
1939 	if (*wlen == (size_t)-1) {
1940 		int vislen;
1941 		if (errno != EILSEQ)
1942 			return got_error_from_errno("mbstowcs");
1943 
1944 		/* byte string invalid in current encoding; try to "fix" it */
1945 		err = got_mbsavis(&vis, &vislen, s);
1946 		if (err)
1947 			return err;
1948 		*wlen = mbstowcs(NULL, vis, 0);
1949 		if (*wlen == (size_t)-1) {
1950 			err = got_error_from_errno("mbstowcs"); /* give up */
1951 			goto done;
1952 		}
1953 	}
1954 
1955 	*ws = calloc(*wlen + 1, sizeof(**ws));
1956 	if (*ws == NULL) {
1957 		err = got_error_from_errno("calloc");
1958 		goto done;
1959 	}
1960 
1961 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1962 		err = got_error_from_errno("mbstowcs");
1963 done:
1964 	free(vis);
1965 	if (err) {
1966 		free(*ws);
1967 		*ws = NULL;
1968 		*wlen = 0;
1969 	}
1970 	return err;
1971 }
1972 
1973 static const struct got_error *
1974 expand_tab(char **ptr, const char *src)
1975 {
1976 	char	*dst;
1977 	size_t	 len, n, idx = 0, sz = 0;
1978 
1979 	*ptr = NULL;
1980 	n = len = strlen(src);
1981 	dst = malloc(n + 1);
1982 	if (dst == NULL)
1983 		return got_error_from_errno("malloc");
1984 
1985 	while (idx < len && src[idx]) {
1986 		const char c = src[idx];
1987 
1988 		if (c == '\t') {
1989 			size_t nb = TABSIZE - sz % TABSIZE;
1990 			char *p;
1991 
1992 			p = realloc(dst, n + nb);
1993 			if (p == NULL) {
1994 				free(dst);
1995 				return got_error_from_errno("realloc");
1996 
1997 			}
1998 			dst = p;
1999 			n += nb;
2000 			memset(dst + sz, ' ', nb);
2001 			sz += nb;
2002 		} else
2003 			dst[sz++] = src[idx];
2004 		++idx;
2005 	}
2006 
2007 	dst[sz] = '\0';
2008 	*ptr = dst;
2009 	return NULL;
2010 }
2011 
2012 /*
2013  * Advance at most n columns from wline starting at offset off.
2014  * Return the index to the first character after the span operation.
2015  * Return the combined column width of all spanned wide character in
2016  * *rcol.
2017  */
2018 static int
2019 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2020 {
2021 	int width, i, cols = 0;
2022 
2023 	if (n == 0) {
2024 		*rcol = cols;
2025 		return off;
2026 	}
2027 
2028 	for (i = off; wline[i] != L'\0'; ++i) {
2029 		if (wline[i] == L'\t')
2030 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2031 		else
2032 			width = wcwidth(wline[i]);
2033 
2034 		if (width == -1) {
2035 			width = 1;
2036 			wline[i] = L'.';
2037 		}
2038 
2039 		if (cols + width > n)
2040 			break;
2041 		cols += width;
2042 	}
2043 
2044 	*rcol = cols;
2045 	return i;
2046 }
2047 
2048 /*
2049  * Format a line for display, ensuring that it won't overflow a width limit.
2050  * With scrolling, the width returned refers to the scrolled version of the
2051  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2052  */
2053 static const struct got_error *
2054 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2055     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2056 {
2057 	const struct got_error *err = NULL;
2058 	int cols;
2059 	wchar_t *wline = NULL;
2060 	char *exstr = NULL;
2061 	size_t wlen;
2062 	int i, scrollx;
2063 
2064 	*wlinep = NULL;
2065 	*widthp = 0;
2066 
2067 	if (expand) {
2068 		err = expand_tab(&exstr, line);
2069 		if (err)
2070 			return err;
2071 	}
2072 
2073 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2074 	free(exstr);
2075 	if (err)
2076 		return err;
2077 
2078 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2079 
2080 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2081 		wline[wlen - 1] = L'\0';
2082 		wlen--;
2083 	}
2084 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2085 		wline[wlen - 1] = L'\0';
2086 		wlen--;
2087 	}
2088 
2089 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2090 	wline[i] = L'\0';
2091 
2092 	if (widthp)
2093 		*widthp = cols;
2094 	if (scrollxp)
2095 		*scrollxp = scrollx;
2096 	if (err)
2097 		free(wline);
2098 	else
2099 		*wlinep = wline;
2100 	return err;
2101 }
2102 
2103 static const struct got_error*
2104 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2105     struct got_object_id *id, struct got_repository *repo)
2106 {
2107 	static const struct got_error *err = NULL;
2108 	struct got_reflist_entry *re;
2109 	char *s;
2110 	const char *name;
2111 
2112 	*refs_str = NULL;
2113 
2114 	TAILQ_FOREACH(re, refs, entry) {
2115 		struct got_tag_object *tag = NULL;
2116 		struct got_object_id *ref_id;
2117 		int cmp;
2118 
2119 		name = got_ref_get_name(re->ref);
2120 		if (strcmp(name, GOT_REF_HEAD) == 0)
2121 			continue;
2122 		if (strncmp(name, "refs/", 5) == 0)
2123 			name += 5;
2124 		if (strncmp(name, "got/", 4) == 0 &&
2125 		    strncmp(name, "got/backup/", 11) != 0)
2126 			continue;
2127 		if (strncmp(name, "heads/", 6) == 0)
2128 			name += 6;
2129 		if (strncmp(name, "remotes/", 8) == 0) {
2130 			name += 8;
2131 			s = strstr(name, "/" GOT_REF_HEAD);
2132 			if (s != NULL && s[strlen(s)] == '\0')
2133 				continue;
2134 		}
2135 		err = got_ref_resolve(&ref_id, repo, re->ref);
2136 		if (err)
2137 			break;
2138 		if (strncmp(name, "tags/", 5) == 0) {
2139 			err = got_object_open_as_tag(&tag, repo, ref_id);
2140 			if (err) {
2141 				if (err->code != GOT_ERR_OBJ_TYPE) {
2142 					free(ref_id);
2143 					break;
2144 				}
2145 				/* Ref points at something other than a tag. */
2146 				err = NULL;
2147 				tag = NULL;
2148 			}
2149 		}
2150 		cmp = got_object_id_cmp(tag ?
2151 		    got_object_tag_get_object_id(tag) : ref_id, id);
2152 		free(ref_id);
2153 		if (tag)
2154 			got_object_tag_close(tag);
2155 		if (cmp != 0)
2156 			continue;
2157 		s = *refs_str;
2158 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2159 		    s ? ", " : "", name) == -1) {
2160 			err = got_error_from_errno("asprintf");
2161 			free(s);
2162 			*refs_str = NULL;
2163 			break;
2164 		}
2165 		free(s);
2166 	}
2167 
2168 	return err;
2169 }
2170 
2171 static const struct got_error *
2172 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2173     int col_tab_align)
2174 {
2175 	char *smallerthan;
2176 
2177 	smallerthan = strchr(author, '<');
2178 	if (smallerthan && smallerthan[1] != '\0')
2179 		author = smallerthan + 1;
2180 	author[strcspn(author, "@>")] = '\0';
2181 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2182 	    col_tab_align, 0);
2183 }
2184 
2185 static const struct got_error *
2186 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2187     struct got_object_id *id, const size_t date_display_cols,
2188     int author_display_cols)
2189 {
2190 	struct tog_log_view_state *s = &view->state.log;
2191 	const struct got_error *err = NULL;
2192 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2193 	char *logmsg0 = NULL, *logmsg = NULL;
2194 	char *author = NULL;
2195 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2196 	int author_width, logmsg_width;
2197 	char *newline, *line = NULL;
2198 	int col, limit, scrollx;
2199 	const int avail = view->ncols;
2200 	struct tm tm;
2201 	time_t committer_time;
2202 	struct tog_color *tc;
2203 
2204 	committer_time = got_object_commit_get_committer_time(commit);
2205 	if (gmtime_r(&committer_time, &tm) == NULL)
2206 		return got_error_from_errno("gmtime_r");
2207 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2208 		return got_error(GOT_ERR_NO_SPACE);
2209 
2210 	if (avail <= date_display_cols)
2211 		limit = MIN(sizeof(datebuf) - 1, avail);
2212 	else
2213 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2214 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2215 	if (tc)
2216 		wattr_on(view->window,
2217 		    COLOR_PAIR(tc->colorpair), NULL);
2218 	waddnstr(view->window, datebuf, limit);
2219 	if (tc)
2220 		wattr_off(view->window,
2221 		    COLOR_PAIR(tc->colorpair), NULL);
2222 	col = limit;
2223 	if (col > avail)
2224 		goto done;
2225 
2226 	if (avail >= 120) {
2227 		char *id_str;
2228 		err = got_object_id_str(&id_str, id);
2229 		if (err)
2230 			goto done;
2231 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2232 		if (tc)
2233 			wattr_on(view->window,
2234 			    COLOR_PAIR(tc->colorpair), NULL);
2235 		wprintw(view->window, "%.8s ", id_str);
2236 		if (tc)
2237 			wattr_off(view->window,
2238 			    COLOR_PAIR(tc->colorpair), NULL);
2239 		free(id_str);
2240 		col += 9;
2241 		if (col > avail)
2242 			goto done;
2243 	}
2244 
2245 	if (s->use_committer)
2246 		author = strdup(got_object_commit_get_committer(commit));
2247 	else
2248 		author = strdup(got_object_commit_get_author(commit));
2249 	if (author == NULL) {
2250 		err = got_error_from_errno("strdup");
2251 		goto done;
2252 	}
2253 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2254 	if (err)
2255 		goto done;
2256 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2257 	if (tc)
2258 		wattr_on(view->window,
2259 		    COLOR_PAIR(tc->colorpair), NULL);
2260 	waddwstr(view->window, wauthor);
2261 	col += author_width;
2262 	while (col < avail && author_width < author_display_cols + 2) {
2263 		waddch(view->window, ' ');
2264 		col++;
2265 		author_width++;
2266 	}
2267 	if (tc)
2268 		wattr_off(view->window,
2269 		    COLOR_PAIR(tc->colorpair), NULL);
2270 	if (col > avail)
2271 		goto done;
2272 
2273 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2274 	if (err)
2275 		goto done;
2276 	logmsg = logmsg0;
2277 	while (*logmsg == '\n')
2278 		logmsg++;
2279 	newline = strchr(logmsg, '\n');
2280 	if (newline)
2281 		*newline = '\0';
2282 	limit = avail - col;
2283 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2284 		limit--;	/* for the border */
2285 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2286 	    limit, col, 1);
2287 	if (err)
2288 		goto done;
2289 	waddwstr(view->window, &wlogmsg[scrollx]);
2290 	col += MAX(logmsg_width, 0);
2291 	while (col < avail) {
2292 		waddch(view->window, ' ');
2293 		col++;
2294 	}
2295 done:
2296 	free(logmsg0);
2297 	free(wlogmsg);
2298 	free(author);
2299 	free(wauthor);
2300 	free(line);
2301 	return err;
2302 }
2303 
2304 static struct commit_queue_entry *
2305 alloc_commit_queue_entry(struct got_commit_object *commit,
2306     struct got_object_id *id)
2307 {
2308 	struct commit_queue_entry *entry;
2309 	struct got_object_id *dup;
2310 
2311 	entry = calloc(1, sizeof(*entry));
2312 	if (entry == NULL)
2313 		return NULL;
2314 
2315 	dup = got_object_id_dup(id);
2316 	if (dup == NULL) {
2317 		free(entry);
2318 		return NULL;
2319 	}
2320 
2321 	entry->id = dup;
2322 	entry->commit = commit;
2323 	return entry;
2324 }
2325 
2326 static void
2327 pop_commit(struct commit_queue *commits)
2328 {
2329 	struct commit_queue_entry *entry;
2330 
2331 	entry = TAILQ_FIRST(&commits->head);
2332 	TAILQ_REMOVE(&commits->head, entry, entry);
2333 	got_object_commit_close(entry->commit);
2334 	commits->ncommits--;
2335 	free(entry->id);
2336 	free(entry);
2337 }
2338 
2339 static void
2340 free_commits(struct commit_queue *commits)
2341 {
2342 	while (!TAILQ_EMPTY(&commits->head))
2343 		pop_commit(commits);
2344 }
2345 
2346 static const struct got_error *
2347 match_commit(int *have_match, struct got_object_id *id,
2348     struct got_commit_object *commit, regex_t *regex)
2349 {
2350 	const struct got_error *err = NULL;
2351 	regmatch_t regmatch;
2352 	char *id_str = NULL, *logmsg = NULL;
2353 
2354 	*have_match = 0;
2355 
2356 	err = got_object_id_str(&id_str, id);
2357 	if (err)
2358 		return err;
2359 
2360 	err = got_object_commit_get_logmsg(&logmsg, commit);
2361 	if (err)
2362 		goto done;
2363 
2364 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2365 	    &regmatch, 0) == 0 ||
2366 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2367 	    &regmatch, 0) == 0 ||
2368 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2369 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2370 		*have_match = 1;
2371 done:
2372 	free(id_str);
2373 	free(logmsg);
2374 	return err;
2375 }
2376 
2377 static const struct got_error *
2378 queue_commits(struct tog_log_thread_args *a)
2379 {
2380 	const struct got_error *err = NULL;
2381 
2382 	/*
2383 	 * We keep all commits open throughout the lifetime of the log
2384 	 * view in order to avoid having to re-fetch commits from disk
2385 	 * while updating the display.
2386 	 */
2387 	do {
2388 		struct got_object_id id;
2389 		struct got_commit_object *commit;
2390 		struct commit_queue_entry *entry;
2391 		int limit_match = 0;
2392 		int errcode;
2393 
2394 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2395 		    NULL, NULL);
2396 		if (err)
2397 			break;
2398 
2399 		err = got_object_open_as_commit(&commit, a->repo, &id);
2400 		if (err)
2401 			break;
2402 		entry = alloc_commit_queue_entry(commit, &id);
2403 		if (entry == NULL) {
2404 			err = got_error_from_errno("alloc_commit_queue_entry");
2405 			break;
2406 		}
2407 
2408 		errcode = pthread_mutex_lock(&tog_mutex);
2409 		if (errcode) {
2410 			err = got_error_set_errno(errcode,
2411 			    "pthread_mutex_lock");
2412 			break;
2413 		}
2414 
2415 		entry->idx = a->real_commits->ncommits;
2416 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2417 		a->real_commits->ncommits++;
2418 
2419 		if (*a->limiting) {
2420 			err = match_commit(&limit_match, &id, commit,
2421 			    a->limit_regex);
2422 			if (err)
2423 				break;
2424 
2425 			if (limit_match) {
2426 				struct commit_queue_entry *matched;
2427 
2428 				matched = alloc_commit_queue_entry(
2429 				    entry->commit, entry->id);
2430 				if (matched == NULL) {
2431 					err = got_error_from_errno(
2432 					    "alloc_commit_queue_entry");
2433 					break;
2434 				}
2435 				matched->commit = entry->commit;
2436 				got_object_commit_retain(entry->commit);
2437 
2438 				matched->idx = a->limit_commits->ncommits;
2439 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2440 				    matched, entry);
2441 				a->limit_commits->ncommits++;
2442 			}
2443 
2444 			/*
2445 			 * This is how we signal log_thread() that we
2446 			 * have found a match, and that it should be
2447 			 * counted as a new entry for the view.
2448 			 */
2449 			a->limit_match = limit_match;
2450 		}
2451 
2452 		if (*a->searching == TOG_SEARCH_FORWARD &&
2453 		    !*a->search_next_done) {
2454 			int have_match;
2455 			err = match_commit(&have_match, &id, commit, a->regex);
2456 			if (err)
2457 				break;
2458 
2459 			if (*a->limiting) {
2460 				if (limit_match && have_match)
2461 					*a->search_next_done =
2462 					    TOG_SEARCH_HAVE_MORE;
2463 			} else if (have_match)
2464 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2465 		}
2466 
2467 		errcode = pthread_mutex_unlock(&tog_mutex);
2468 		if (errcode && err == NULL)
2469 			err = got_error_set_errno(errcode,
2470 			    "pthread_mutex_unlock");
2471 		if (err)
2472 			break;
2473 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2474 
2475 	return err;
2476 }
2477 
2478 static void
2479 select_commit(struct tog_log_view_state *s)
2480 {
2481 	struct commit_queue_entry *entry;
2482 	int ncommits = 0;
2483 
2484 	entry = s->first_displayed_entry;
2485 	while (entry) {
2486 		if (ncommits == s->selected) {
2487 			s->selected_entry = entry;
2488 			break;
2489 		}
2490 		entry = TAILQ_NEXT(entry, entry);
2491 		ncommits++;
2492 	}
2493 }
2494 
2495 static const struct got_error *
2496 draw_commits(struct tog_view *view)
2497 {
2498 	const struct got_error *err = NULL;
2499 	struct tog_log_view_state *s = &view->state.log;
2500 	struct commit_queue_entry *entry = s->selected_entry;
2501 	int limit = view->nlines;
2502 	int width;
2503 	int ncommits, author_cols = 4;
2504 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2505 	char *refs_str = NULL;
2506 	wchar_t *wline;
2507 	struct tog_color *tc;
2508 	static const size_t date_display_cols = 12;
2509 
2510 	if (view_is_hsplit_top(view))
2511 		--limit;  /* account for border */
2512 
2513 	if (s->selected_entry &&
2514 	    !(view->searching && view->search_next_done == 0)) {
2515 		struct got_reflist_head *refs;
2516 		err = got_object_id_str(&id_str, s->selected_entry->id);
2517 		if (err)
2518 			return err;
2519 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2520 		    s->selected_entry->id);
2521 		if (refs) {
2522 			err = build_refs_str(&refs_str, refs,
2523 			    s->selected_entry->id, s->repo);
2524 			if (err)
2525 				goto done;
2526 		}
2527 	}
2528 
2529 	if (s->thread_args.commits_needed == 0)
2530 		halfdelay(10); /* disable fast refresh */
2531 
2532 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2533 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2534 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2535 		    (view->searching && !view->search_next_done) ?
2536 		    "searching..." : "loading...") == -1) {
2537 			err = got_error_from_errno("asprintf");
2538 			goto done;
2539 		}
2540 	} else {
2541 		const char *search_str = NULL;
2542 		const char *limit_str = NULL;
2543 
2544 		if (view->searching) {
2545 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2546 				search_str = "no more matches";
2547 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2548 				search_str = "no matches found";
2549 			else if (!view->search_next_done)
2550 				search_str = "searching...";
2551 		}
2552 
2553 		if (s->limit_view && s->commits->ncommits == 0)
2554 			limit_str = "no matches found";
2555 
2556 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2557 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2558 		    search_str ? search_str : (refs_str ? refs_str : ""),
2559 		    limit_str ? limit_str : "") == -1) {
2560 			err = got_error_from_errno("asprintf");
2561 			goto done;
2562 		}
2563 	}
2564 
2565 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2566 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2567 		    "........................................",
2568 		    s->in_repo_path, ncommits_str) == -1) {
2569 			err = got_error_from_errno("asprintf");
2570 			header = NULL;
2571 			goto done;
2572 		}
2573 	} else if (asprintf(&header, "commit %s%s",
2574 	    id_str ? id_str : "........................................",
2575 	    ncommits_str) == -1) {
2576 		err = got_error_from_errno("asprintf");
2577 		header = NULL;
2578 		goto done;
2579 	}
2580 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2581 	if (err)
2582 		goto done;
2583 
2584 	werase(view->window);
2585 
2586 	if (view_needs_focus_indication(view))
2587 		wstandout(view->window);
2588 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2589 	if (tc)
2590 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2591 	waddwstr(view->window, wline);
2592 	while (width < view->ncols) {
2593 		waddch(view->window, ' ');
2594 		width++;
2595 	}
2596 	if (tc)
2597 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2598 	if (view_needs_focus_indication(view))
2599 		wstandend(view->window);
2600 	free(wline);
2601 	if (limit <= 1)
2602 		goto done;
2603 
2604 	/* Grow author column size if necessary, and set view->maxx. */
2605 	entry = s->first_displayed_entry;
2606 	ncommits = 0;
2607 	view->maxx = 0;
2608 	while (entry) {
2609 		struct got_commit_object *c = entry->commit;
2610 		char *author, *eol, *msg, *msg0;
2611 		wchar_t *wauthor, *wmsg;
2612 		int width;
2613 		if (ncommits >= limit - 1)
2614 			break;
2615 		if (s->use_committer)
2616 			author = strdup(got_object_commit_get_committer(c));
2617 		else
2618 			author = strdup(got_object_commit_get_author(c));
2619 		if (author == NULL) {
2620 			err = got_error_from_errno("strdup");
2621 			goto done;
2622 		}
2623 		err = format_author(&wauthor, &width, author, COLS,
2624 		    date_display_cols);
2625 		if (author_cols < width)
2626 			author_cols = width;
2627 		free(wauthor);
2628 		free(author);
2629 		if (err)
2630 			goto done;
2631 		err = got_object_commit_get_logmsg(&msg0, c);
2632 		if (err)
2633 			goto done;
2634 		msg = msg0;
2635 		while (*msg == '\n')
2636 			++msg;
2637 		if ((eol = strchr(msg, '\n')))
2638 			*eol = '\0';
2639 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2640 		    date_display_cols + author_cols, 0);
2641 		if (err)
2642 			goto done;
2643 		view->maxx = MAX(view->maxx, width);
2644 		free(msg0);
2645 		free(wmsg);
2646 		ncommits++;
2647 		entry = TAILQ_NEXT(entry, entry);
2648 	}
2649 
2650 	entry = s->first_displayed_entry;
2651 	s->last_displayed_entry = s->first_displayed_entry;
2652 	ncommits = 0;
2653 	while (entry) {
2654 		if (ncommits >= limit - 1)
2655 			break;
2656 		if (ncommits == s->selected)
2657 			wstandout(view->window);
2658 		err = draw_commit(view, entry->commit, entry->id,
2659 		    date_display_cols, author_cols);
2660 		if (ncommits == s->selected)
2661 			wstandend(view->window);
2662 		if (err)
2663 			goto done;
2664 		ncommits++;
2665 		s->last_displayed_entry = entry;
2666 		entry = TAILQ_NEXT(entry, entry);
2667 	}
2668 
2669 	view_border(view);
2670 done:
2671 	free(id_str);
2672 	free(refs_str);
2673 	free(ncommits_str);
2674 	free(header);
2675 	return err;
2676 }
2677 
2678 static void
2679 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2680 {
2681 	struct commit_queue_entry *entry;
2682 	int nscrolled = 0;
2683 
2684 	entry = TAILQ_FIRST(&s->commits->head);
2685 	if (s->first_displayed_entry == entry)
2686 		return;
2687 
2688 	entry = s->first_displayed_entry;
2689 	while (entry && nscrolled < maxscroll) {
2690 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2691 		if (entry) {
2692 			s->first_displayed_entry = entry;
2693 			nscrolled++;
2694 		}
2695 	}
2696 }
2697 
2698 static const struct got_error *
2699 trigger_log_thread(struct tog_view *view, int wait)
2700 {
2701 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2702 	int errcode;
2703 
2704 	halfdelay(1); /* fast refresh while loading commits */
2705 
2706 	while (!ta->log_complete && !tog_thread_error &&
2707 	    (ta->commits_needed > 0 || ta->load_all)) {
2708 		/* Wake the log thread. */
2709 		errcode = pthread_cond_signal(&ta->need_commits);
2710 		if (errcode)
2711 			return got_error_set_errno(errcode,
2712 			    "pthread_cond_signal");
2713 
2714 		/*
2715 		 * The mutex will be released while the view loop waits
2716 		 * in wgetch(), at which time the log thread will run.
2717 		 */
2718 		if (!wait)
2719 			break;
2720 
2721 		/* Display progress update in log view. */
2722 		show_log_view(view);
2723 		update_panels();
2724 		doupdate();
2725 
2726 		/* Wait right here while next commit is being loaded. */
2727 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2728 		if (errcode)
2729 			return got_error_set_errno(errcode,
2730 			    "pthread_cond_wait");
2731 
2732 		/* Display progress update in log view. */
2733 		show_log_view(view);
2734 		update_panels();
2735 		doupdate();
2736 	}
2737 
2738 	return NULL;
2739 }
2740 
2741 static const struct got_error *
2742 request_log_commits(struct tog_view *view)
2743 {
2744 	struct tog_log_view_state	*state = &view->state.log;
2745 	const struct got_error		*err = NULL;
2746 
2747 	if (state->thread_args.log_complete)
2748 		return NULL;
2749 
2750 	state->thread_args.commits_needed += view->nscrolled;
2751 	err = trigger_log_thread(view, 1);
2752 	view->nscrolled = 0;
2753 
2754 	return err;
2755 }
2756 
2757 static const struct got_error *
2758 log_scroll_down(struct tog_view *view, int maxscroll)
2759 {
2760 	struct tog_log_view_state *s = &view->state.log;
2761 	const struct got_error *err = NULL;
2762 	struct commit_queue_entry *pentry;
2763 	int nscrolled = 0, ncommits_needed;
2764 
2765 	if (s->last_displayed_entry == NULL)
2766 		return NULL;
2767 
2768 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2769 	if (s->commits->ncommits < ncommits_needed &&
2770 	    !s->thread_args.log_complete) {
2771 		/*
2772 		 * Ask the log thread for required amount of commits.
2773 		 */
2774 		s->thread_args.commits_needed +=
2775 		    ncommits_needed - s->commits->ncommits;
2776 		err = trigger_log_thread(view, 1);
2777 		if (err)
2778 			return err;
2779 	}
2780 
2781 	do {
2782 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2783 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2784 			break;
2785 
2786 		s->last_displayed_entry = pentry ?
2787 		    pentry : s->last_displayed_entry;
2788 
2789 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2790 		if (pentry == NULL)
2791 			break;
2792 		s->first_displayed_entry = pentry;
2793 	} while (++nscrolled < maxscroll);
2794 
2795 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2796 		view->nscrolled += nscrolled;
2797 	else
2798 		view->nscrolled = 0;
2799 
2800 	return err;
2801 }
2802 
2803 static const struct got_error *
2804 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2805     struct got_commit_object *commit, struct got_object_id *commit_id,
2806     struct tog_view *log_view, struct got_repository *repo)
2807 {
2808 	const struct got_error *err;
2809 	struct got_object_qid *parent_id;
2810 	struct tog_view *diff_view;
2811 
2812 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2813 	if (diff_view == NULL)
2814 		return got_error_from_errno("view_open");
2815 
2816 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2817 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2818 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2819 	if (err == NULL)
2820 		*new_view = diff_view;
2821 	return err;
2822 }
2823 
2824 static const struct got_error *
2825 tree_view_visit_subtree(struct tog_tree_view_state *s,
2826     struct got_tree_object *subtree)
2827 {
2828 	struct tog_parent_tree *parent;
2829 
2830 	parent = calloc(1, sizeof(*parent));
2831 	if (parent == NULL)
2832 		return got_error_from_errno("calloc");
2833 
2834 	parent->tree = s->tree;
2835 	parent->first_displayed_entry = s->first_displayed_entry;
2836 	parent->selected_entry = s->selected_entry;
2837 	parent->selected = s->selected;
2838 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2839 	s->tree = subtree;
2840 	s->selected = 0;
2841 	s->first_displayed_entry = NULL;
2842 	return NULL;
2843 }
2844 
2845 static const struct got_error *
2846 tree_view_walk_path(struct tog_tree_view_state *s,
2847     struct got_commit_object *commit, const char *path)
2848 {
2849 	const struct got_error *err = NULL;
2850 	struct got_tree_object *tree = NULL;
2851 	const char *p;
2852 	char *slash, *subpath = NULL;
2853 
2854 	/* Walk the path and open corresponding tree objects. */
2855 	p = path;
2856 	while (*p) {
2857 		struct got_tree_entry *te;
2858 		struct got_object_id *tree_id;
2859 		char *te_name;
2860 
2861 		while (p[0] == '/')
2862 			p++;
2863 
2864 		/* Ensure the correct subtree entry is selected. */
2865 		slash = strchr(p, '/');
2866 		if (slash == NULL)
2867 			te_name = strdup(p);
2868 		else
2869 			te_name = strndup(p, slash - p);
2870 		if (te_name == NULL) {
2871 			err = got_error_from_errno("strndup");
2872 			break;
2873 		}
2874 		te = got_object_tree_find_entry(s->tree, te_name);
2875 		if (te == NULL) {
2876 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2877 			free(te_name);
2878 			break;
2879 		}
2880 		free(te_name);
2881 		s->first_displayed_entry = s->selected_entry = te;
2882 
2883 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2884 			break; /* jump to this file's entry */
2885 
2886 		slash = strchr(p, '/');
2887 		if (slash)
2888 			subpath = strndup(path, slash - path);
2889 		else
2890 			subpath = strdup(path);
2891 		if (subpath == NULL) {
2892 			err = got_error_from_errno("strdup");
2893 			break;
2894 		}
2895 
2896 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2897 		    subpath);
2898 		if (err)
2899 			break;
2900 
2901 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2902 		free(tree_id);
2903 		if (err)
2904 			break;
2905 
2906 		err = tree_view_visit_subtree(s, tree);
2907 		if (err) {
2908 			got_object_tree_close(tree);
2909 			break;
2910 		}
2911 		if (slash == NULL)
2912 			break;
2913 		free(subpath);
2914 		subpath = NULL;
2915 		p = slash;
2916 	}
2917 
2918 	free(subpath);
2919 	return err;
2920 }
2921 
2922 static const struct got_error *
2923 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2924     struct commit_queue_entry *entry, const char *path,
2925     const char *head_ref_name, struct got_repository *repo)
2926 {
2927 	const struct got_error *err = NULL;
2928 	struct tog_tree_view_state *s;
2929 	struct tog_view *tree_view;
2930 
2931 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2932 	if (tree_view == NULL)
2933 		return got_error_from_errno("view_open");
2934 
2935 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2936 	if (err)
2937 		return err;
2938 	s = &tree_view->state.tree;
2939 
2940 	*new_view = tree_view;
2941 
2942 	if (got_path_is_root_dir(path))
2943 		return NULL;
2944 
2945 	return tree_view_walk_path(s, entry->commit, path);
2946 }
2947 
2948 static const struct got_error *
2949 block_signals_used_by_main_thread(void)
2950 {
2951 	sigset_t sigset;
2952 	int errcode;
2953 
2954 	if (sigemptyset(&sigset) == -1)
2955 		return got_error_from_errno("sigemptyset");
2956 
2957 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2958 	if (sigaddset(&sigset, SIGWINCH) == -1)
2959 		return got_error_from_errno("sigaddset");
2960 	if (sigaddset(&sigset, SIGCONT) == -1)
2961 		return got_error_from_errno("sigaddset");
2962 	if (sigaddset(&sigset, SIGINT) == -1)
2963 		return got_error_from_errno("sigaddset");
2964 	if (sigaddset(&sigset, SIGTERM) == -1)
2965 		return got_error_from_errno("sigaddset");
2966 
2967 	/* ncurses handles SIGTSTP */
2968 	if (sigaddset(&sigset, SIGTSTP) == -1)
2969 		return got_error_from_errno("sigaddset");
2970 
2971 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2972 	if (errcode)
2973 		return got_error_set_errno(errcode, "pthread_sigmask");
2974 
2975 	return NULL;
2976 }
2977 
2978 static void *
2979 log_thread(void *arg)
2980 {
2981 	const struct got_error *err = NULL;
2982 	int errcode = 0;
2983 	struct tog_log_thread_args *a = arg;
2984 	int done = 0;
2985 
2986 	/*
2987 	 * Sync startup with main thread such that we begin our
2988 	 * work once view_input() has released the mutex.
2989 	 */
2990 	errcode = pthread_mutex_lock(&tog_mutex);
2991 	if (errcode) {
2992 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2993 		return (void *)err;
2994 	}
2995 
2996 	err = block_signals_used_by_main_thread();
2997 	if (err) {
2998 		pthread_mutex_unlock(&tog_mutex);
2999 		goto done;
3000 	}
3001 
3002 	while (!done && !err && !tog_fatal_signal_received()) {
3003 		errcode = pthread_mutex_unlock(&tog_mutex);
3004 		if (errcode) {
3005 			err = got_error_set_errno(errcode,
3006 			    "pthread_mutex_unlock");
3007 			goto done;
3008 		}
3009 		err = queue_commits(a);
3010 		if (err) {
3011 			if (err->code != GOT_ERR_ITER_COMPLETED)
3012 				goto done;
3013 			err = NULL;
3014 			done = 1;
3015 		} else if (a->commits_needed > 0 && !a->load_all) {
3016 			if (*a->limiting) {
3017 				if (a->limit_match)
3018 					a->commits_needed--;
3019 			} else
3020 				a->commits_needed--;
3021 		}
3022 
3023 		errcode = pthread_mutex_lock(&tog_mutex);
3024 		if (errcode) {
3025 			err = got_error_set_errno(errcode,
3026 			    "pthread_mutex_lock");
3027 			goto done;
3028 		} else if (*a->quit)
3029 			done = 1;
3030 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3031 			*a->first_displayed_entry =
3032 			    TAILQ_FIRST(&a->limit_commits->head);
3033 			*a->selected_entry = *a->first_displayed_entry;
3034 		} else if (*a->first_displayed_entry == NULL) {
3035 			*a->first_displayed_entry =
3036 			    TAILQ_FIRST(&a->real_commits->head);
3037 			*a->selected_entry = *a->first_displayed_entry;
3038 		}
3039 
3040 		errcode = pthread_cond_signal(&a->commit_loaded);
3041 		if (errcode) {
3042 			err = got_error_set_errno(errcode,
3043 			    "pthread_cond_signal");
3044 			pthread_mutex_unlock(&tog_mutex);
3045 			goto done;
3046 		}
3047 
3048 		if (done)
3049 			a->commits_needed = 0;
3050 		else {
3051 			if (a->commits_needed == 0 && !a->load_all) {
3052 				errcode = pthread_cond_wait(&a->need_commits,
3053 				    &tog_mutex);
3054 				if (errcode) {
3055 					err = got_error_set_errno(errcode,
3056 					    "pthread_cond_wait");
3057 					pthread_mutex_unlock(&tog_mutex);
3058 					goto done;
3059 				}
3060 				if (*a->quit)
3061 					done = 1;
3062 			}
3063 		}
3064 	}
3065 	a->log_complete = 1;
3066 	errcode = pthread_mutex_unlock(&tog_mutex);
3067 	if (errcode)
3068 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3069 done:
3070 	if (err) {
3071 		tog_thread_error = 1;
3072 		pthread_cond_signal(&a->commit_loaded);
3073 	}
3074 	return (void *)err;
3075 }
3076 
3077 static const struct got_error *
3078 stop_log_thread(struct tog_log_view_state *s)
3079 {
3080 	const struct got_error *err = NULL, *thread_err = NULL;
3081 	int errcode;
3082 
3083 	if (s->thread) {
3084 		s->quit = 1;
3085 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3086 		if (errcode)
3087 			return got_error_set_errno(errcode,
3088 			    "pthread_cond_signal");
3089 		errcode = pthread_mutex_unlock(&tog_mutex);
3090 		if (errcode)
3091 			return got_error_set_errno(errcode,
3092 			    "pthread_mutex_unlock");
3093 		errcode = pthread_join(s->thread, (void **)&thread_err);
3094 		if (errcode)
3095 			return got_error_set_errno(errcode, "pthread_join");
3096 		errcode = pthread_mutex_lock(&tog_mutex);
3097 		if (errcode)
3098 			return got_error_set_errno(errcode,
3099 			    "pthread_mutex_lock");
3100 		s->thread = 0; //NULL;
3101 	}
3102 
3103 	if (s->thread_args.repo) {
3104 		err = got_repo_close(s->thread_args.repo);
3105 		s->thread_args.repo = NULL;
3106 	}
3107 
3108 	if (s->thread_args.pack_fds) {
3109 		const struct got_error *pack_err =
3110 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3111 		if (err == NULL)
3112 			err = pack_err;
3113 		s->thread_args.pack_fds = NULL;
3114 	}
3115 
3116 	if (s->thread_args.graph) {
3117 		got_commit_graph_close(s->thread_args.graph);
3118 		s->thread_args.graph = NULL;
3119 	}
3120 
3121 	return err ? err : thread_err;
3122 }
3123 
3124 static const struct got_error *
3125 close_log_view(struct tog_view *view)
3126 {
3127 	const struct got_error *err = NULL;
3128 	struct tog_log_view_state *s = &view->state.log;
3129 	int errcode;
3130 
3131 	err = stop_log_thread(s);
3132 
3133 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3134 	if (errcode && err == NULL)
3135 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3136 
3137 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3138 	if (errcode && err == NULL)
3139 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3140 
3141 	free_commits(&s->limit_commits);
3142 	free_commits(&s->real_commits);
3143 	free(s->in_repo_path);
3144 	s->in_repo_path = NULL;
3145 	free(s->start_id);
3146 	s->start_id = NULL;
3147 	free(s->head_ref_name);
3148 	s->head_ref_name = NULL;
3149 	return err;
3150 }
3151 
3152 /*
3153  * We use two queues to implement the limit feature: first consists of
3154  * commits matching the current limit_regex; second is the real queue
3155  * of all known commits (real_commits). When the user starts limiting,
3156  * we swap queues such that all movement and displaying functionality
3157  * works with very slight change.
3158  */
3159 static const struct got_error *
3160 limit_log_view(struct tog_view *view)
3161 {
3162 	struct tog_log_view_state *s = &view->state.log;
3163 	struct commit_queue_entry *entry;
3164 	struct tog_view	*v = view;
3165 	const struct got_error *err = NULL;
3166 	char pattern[1024];
3167 	int ret;
3168 
3169 	if (view_is_hsplit_top(view))
3170 		v = view->child;
3171 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3172 		v = view->parent;
3173 
3174 	/* Get the pattern */
3175 	wmove(v->window, v->nlines - 1, 0);
3176 	wclrtoeol(v->window);
3177 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3178 	nodelay(v->window, FALSE);
3179 	nocbreak();
3180 	echo();
3181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3182 	cbreak();
3183 	noecho();
3184 	nodelay(v->window, TRUE);
3185 	if (ret == ERR)
3186 		return NULL;
3187 
3188 	if (*pattern == '\0') {
3189 		/*
3190 		 * Safety measure for the situation where the user
3191 		 * resets limit without previously limiting anything.
3192 		 */
3193 		if (!s->limit_view)
3194 			return NULL;
3195 
3196 		/*
3197 		 * User could have pressed Ctrl+L, which refreshed the
3198 		 * commit queues, it means we can't save previously
3199 		 * (before limit took place) displayed entries,
3200 		 * because they would point to already free'ed memory,
3201 		 * so we are forced to always select first entry of
3202 		 * the queue.
3203 		 */
3204 		s->commits = &s->real_commits;
3205 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3206 		s->selected_entry = s->first_displayed_entry;
3207 		s->selected = 0;
3208 		s->limit_view = 0;
3209 
3210 		return NULL;
3211 	}
3212 
3213 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3214 		return NULL;
3215 
3216 	s->limit_view = 1;
3217 
3218 	/* Clear the screen while loading limit view */
3219 	s->first_displayed_entry = NULL;
3220 	s->last_displayed_entry = NULL;
3221 	s->selected_entry = NULL;
3222 	s->commits = &s->limit_commits;
3223 
3224 	/* Prepare limit queue for new search */
3225 	free_commits(&s->limit_commits);
3226 	s->limit_commits.ncommits = 0;
3227 
3228 	/* First process commits, which are in queue already */
3229 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3230 		int have_match = 0;
3231 
3232 		err = match_commit(&have_match, entry->id,
3233 		    entry->commit, &s->limit_regex);
3234 		if (err)
3235 			return err;
3236 
3237 		if (have_match) {
3238 			struct commit_queue_entry *matched;
3239 
3240 			matched = alloc_commit_queue_entry(entry->commit,
3241 			    entry->id);
3242 			if (matched == NULL) {
3243 				err = got_error_from_errno(
3244 				    "alloc_commit_queue_entry");
3245 				break;
3246 			}
3247 			matched->commit = entry->commit;
3248 			got_object_commit_retain(entry->commit);
3249 
3250 			matched->idx = s->limit_commits.ncommits;
3251 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3252 			    matched, entry);
3253 			s->limit_commits.ncommits++;
3254 		}
3255 	}
3256 
3257 	/* Second process all the commits, until we fill the screen */
3258 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3259 	    !s->thread_args.log_complete) {
3260 		s->thread_args.commits_needed +=
3261 		    view->nlines - s->limit_commits.ncommits - 1;
3262 		err = trigger_log_thread(view, 1);
3263 		if (err)
3264 			return err;
3265 	}
3266 
3267 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3268 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3269 	s->selected = 0;
3270 
3271 	return NULL;
3272 }
3273 
3274 static const struct got_error *
3275 search_start_log_view(struct tog_view *view)
3276 {
3277 	struct tog_log_view_state *s = &view->state.log;
3278 
3279 	s->matched_entry = NULL;
3280 	s->search_entry = NULL;
3281 	return NULL;
3282 }
3283 
3284 static const struct got_error *
3285 search_next_log_view(struct tog_view *view)
3286 {
3287 	const struct got_error *err = NULL;
3288 	struct tog_log_view_state *s = &view->state.log;
3289 	struct commit_queue_entry *entry;
3290 
3291 	/* Display progress update in log view. */
3292 	show_log_view(view);
3293 	update_panels();
3294 	doupdate();
3295 
3296 	if (s->search_entry) {
3297 		int errcode, ch;
3298 		errcode = pthread_mutex_unlock(&tog_mutex);
3299 		if (errcode)
3300 			return got_error_set_errno(errcode,
3301 			    "pthread_mutex_unlock");
3302 		ch = wgetch(view->window);
3303 		errcode = pthread_mutex_lock(&tog_mutex);
3304 		if (errcode)
3305 			return got_error_set_errno(errcode,
3306 			    "pthread_mutex_lock");
3307 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3308 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3309 			return NULL;
3310 		}
3311 		if (view->searching == TOG_SEARCH_FORWARD)
3312 			entry = TAILQ_NEXT(s->search_entry, entry);
3313 		else
3314 			entry = TAILQ_PREV(s->search_entry,
3315 			    commit_queue_head, entry);
3316 	} else if (s->matched_entry) {
3317 		/*
3318 		 * If the user has moved the cursor after we hit a match,
3319 		 * the position from where we should continue searching
3320 		 * might have changed.
3321 		 */
3322 		if (view->searching == TOG_SEARCH_FORWARD)
3323 			entry = TAILQ_NEXT(s->selected_entry, entry);
3324 		else
3325 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3326 			    entry);
3327 	} else {
3328 		entry = s->selected_entry;
3329 	}
3330 
3331 	while (1) {
3332 		int have_match = 0;
3333 
3334 		if (entry == NULL) {
3335 			if (s->thread_args.log_complete ||
3336 			    view->searching == TOG_SEARCH_BACKWARD) {
3337 				view->search_next_done =
3338 				    (s->matched_entry == NULL ?
3339 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3340 				s->search_entry = NULL;
3341 				return NULL;
3342 			}
3343 			/*
3344 			 * Poke the log thread for more commits and return,
3345 			 * allowing the main loop to make progress. Search
3346 			 * will resume at s->search_entry once we come back.
3347 			 */
3348 			s->thread_args.commits_needed++;
3349 			return trigger_log_thread(view, 0);
3350 		}
3351 
3352 		err = match_commit(&have_match, entry->id, entry->commit,
3353 		    &view->regex);
3354 		if (err)
3355 			break;
3356 		if (have_match) {
3357 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3358 			s->matched_entry = entry;
3359 			break;
3360 		}
3361 
3362 		s->search_entry = entry;
3363 		if (view->searching == TOG_SEARCH_FORWARD)
3364 			entry = TAILQ_NEXT(entry, entry);
3365 		else
3366 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3367 	}
3368 
3369 	if (s->matched_entry) {
3370 		int cur = s->selected_entry->idx;
3371 		while (cur < s->matched_entry->idx) {
3372 			err = input_log_view(NULL, view, KEY_DOWN);
3373 			if (err)
3374 				return err;
3375 			cur++;
3376 		}
3377 		while (cur > s->matched_entry->idx) {
3378 			err = input_log_view(NULL, view, KEY_UP);
3379 			if (err)
3380 				return err;
3381 			cur--;
3382 		}
3383 	}
3384 
3385 	s->search_entry = NULL;
3386 
3387 	return NULL;
3388 }
3389 
3390 static const struct got_error *
3391 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3392     struct got_repository *repo, const char *head_ref_name,
3393     const char *in_repo_path, int log_branches)
3394 {
3395 	const struct got_error *err = NULL;
3396 	struct tog_log_view_state *s = &view->state.log;
3397 	struct got_repository *thread_repo = NULL;
3398 	struct got_commit_graph *thread_graph = NULL;
3399 	int errcode;
3400 
3401 	if (in_repo_path != s->in_repo_path) {
3402 		free(s->in_repo_path);
3403 		s->in_repo_path = strdup(in_repo_path);
3404 		if (s->in_repo_path == NULL)
3405 			return got_error_from_errno("strdup");
3406 	}
3407 
3408 	/* The commit queue only contains commits being displayed. */
3409 	TAILQ_INIT(&s->real_commits.head);
3410 	s->real_commits.ncommits = 0;
3411 	s->commits = &s->real_commits;
3412 
3413 	TAILQ_INIT(&s->limit_commits.head);
3414 	s->limit_view = 0;
3415 	s->limit_commits.ncommits = 0;
3416 
3417 	s->repo = repo;
3418 	if (head_ref_name) {
3419 		s->head_ref_name = strdup(head_ref_name);
3420 		if (s->head_ref_name == NULL) {
3421 			err = got_error_from_errno("strdup");
3422 			goto done;
3423 		}
3424 	}
3425 	s->start_id = got_object_id_dup(start_id);
3426 	if (s->start_id == NULL) {
3427 		err = got_error_from_errno("got_object_id_dup");
3428 		goto done;
3429 	}
3430 	s->log_branches = log_branches;
3431 	s->use_committer = 1;
3432 
3433 	STAILQ_INIT(&s->colors);
3434 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3435 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3436 		    get_color_value("TOG_COLOR_COMMIT"));
3437 		if (err)
3438 			goto done;
3439 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3440 		    get_color_value("TOG_COLOR_AUTHOR"));
3441 		if (err) {
3442 			free_colors(&s->colors);
3443 			goto done;
3444 		}
3445 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3446 		    get_color_value("TOG_COLOR_DATE"));
3447 		if (err) {
3448 			free_colors(&s->colors);
3449 			goto done;
3450 		}
3451 	}
3452 
3453 	view->show = show_log_view;
3454 	view->input = input_log_view;
3455 	view->resize = resize_log_view;
3456 	view->close = close_log_view;
3457 	view->search_start = search_start_log_view;
3458 	view->search_next = search_next_log_view;
3459 
3460 	if (s->thread_args.pack_fds == NULL) {
3461 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3462 		if (err)
3463 			goto done;
3464 	}
3465 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3466 	    s->thread_args.pack_fds);
3467 	if (err)
3468 		goto done;
3469 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3470 	    !s->log_branches);
3471 	if (err)
3472 		goto done;
3473 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3474 	    s->repo, NULL, NULL);
3475 	if (err)
3476 		goto done;
3477 
3478 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3479 	if (errcode) {
3480 		err = got_error_set_errno(errcode, "pthread_cond_init");
3481 		goto done;
3482 	}
3483 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3484 	if (errcode) {
3485 		err = got_error_set_errno(errcode, "pthread_cond_init");
3486 		goto done;
3487 	}
3488 
3489 	s->thread_args.commits_needed = view->nlines;
3490 	s->thread_args.graph = thread_graph;
3491 	s->thread_args.real_commits = &s->real_commits;
3492 	s->thread_args.limit_commits = &s->limit_commits;
3493 	s->thread_args.in_repo_path = s->in_repo_path;
3494 	s->thread_args.start_id = s->start_id;
3495 	s->thread_args.repo = thread_repo;
3496 	s->thread_args.log_complete = 0;
3497 	s->thread_args.quit = &s->quit;
3498 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3499 	s->thread_args.selected_entry = &s->selected_entry;
3500 	s->thread_args.searching = &view->searching;
3501 	s->thread_args.search_next_done = &view->search_next_done;
3502 	s->thread_args.regex = &view->regex;
3503 	s->thread_args.limiting = &s->limit_view;
3504 	s->thread_args.limit_regex = &s->limit_regex;
3505 	s->thread_args.limit_commits = &s->limit_commits;
3506 done:
3507 	if (err)
3508 		close_log_view(view);
3509 	return err;
3510 }
3511 
3512 static const struct got_error *
3513 show_log_view(struct tog_view *view)
3514 {
3515 	const struct got_error *err;
3516 	struct tog_log_view_state *s = &view->state.log;
3517 
3518 	if (s->thread == 0) { //NULL) {
3519 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3520 		    &s->thread_args);
3521 		if (errcode)
3522 			return got_error_set_errno(errcode, "pthread_create");
3523 		if (s->thread_args.commits_needed > 0) {
3524 			err = trigger_log_thread(view, 1);
3525 			if (err)
3526 				return err;
3527 		}
3528 	}
3529 
3530 	return draw_commits(view);
3531 }
3532 
3533 static void
3534 log_move_cursor_up(struct tog_view *view, int page, int home)
3535 {
3536 	struct tog_log_view_state *s = &view->state.log;
3537 
3538 	if (s->first_displayed_entry == NULL)
3539 		return;
3540 	if (s->selected_entry->idx == 0)
3541 		view->count = 0;
3542 
3543 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3544 	    || home)
3545 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3546 
3547 	if (!page && !home && s->selected > 0)
3548 		--s->selected;
3549 	else
3550 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3551 
3552 	select_commit(s);
3553 	return;
3554 }
3555 
3556 static const struct got_error *
3557 log_move_cursor_down(struct tog_view *view, int page)
3558 {
3559 	struct tog_log_view_state	*s = &view->state.log;
3560 	const struct got_error		*err = NULL;
3561 	int				 eos = view->nlines - 2;
3562 
3563 	if (s->first_displayed_entry == NULL)
3564 		return NULL;
3565 
3566 	if (s->thread_args.log_complete &&
3567 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3568 		return NULL;
3569 
3570 	if (view_is_hsplit_top(view))
3571 		--eos;  /* border consumes the last line */
3572 
3573 	if (!page) {
3574 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3575 			++s->selected;
3576 		else
3577 			err = log_scroll_down(view, 1);
3578 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3579 		struct commit_queue_entry *entry;
3580 		int n;
3581 
3582 		s->selected = 0;
3583 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3584 		s->last_displayed_entry = entry;
3585 		for (n = 0; n <= eos; n++) {
3586 			if (entry == NULL)
3587 				break;
3588 			s->first_displayed_entry = entry;
3589 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3590 		}
3591 		if (n > 0)
3592 			s->selected = n - 1;
3593 	} else {
3594 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3595 		    s->thread_args.log_complete)
3596 			s->selected += MIN(page,
3597 			    s->commits->ncommits - s->selected_entry->idx - 1);
3598 		else
3599 			err = log_scroll_down(view, page);
3600 	}
3601 	if (err)
3602 		return err;
3603 
3604 	/*
3605 	 * We might necessarily overshoot in horizontal
3606 	 * splits; if so, select the last displayed commit.
3607 	 */
3608 	if (s->first_displayed_entry && s->last_displayed_entry) {
3609 		s->selected = MIN(s->selected,
3610 		    s->last_displayed_entry->idx -
3611 		    s->first_displayed_entry->idx);
3612 	}
3613 
3614 	select_commit(s);
3615 
3616 	if (s->thread_args.log_complete &&
3617 	    s->selected_entry->idx == s->commits->ncommits - 1)
3618 		view->count = 0;
3619 
3620 	return NULL;
3621 }
3622 
3623 static void
3624 view_get_split(struct tog_view *view, int *y, int *x)
3625 {
3626 	*x = 0;
3627 	*y = 0;
3628 
3629 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3630 		if (view->child && view->child->resized_y)
3631 			*y = view->child->resized_y;
3632 		else if (view->resized_y)
3633 			*y = view->resized_y;
3634 		else
3635 			*y = view_split_begin_y(view->lines);
3636 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3637 		if (view->child && view->child->resized_x)
3638 			*x = view->child->resized_x;
3639 		else if (view->resized_x)
3640 			*x = view->resized_x;
3641 		else
3642 			*x = view_split_begin_x(view->begin_x);
3643 	}
3644 }
3645 
3646 /* Split view horizontally at y and offset view->state->selected line. */
3647 static const struct got_error *
3648 view_init_hsplit(struct tog_view *view, int y)
3649 {
3650 	const struct got_error *err = NULL;
3651 
3652 	view->nlines = y;
3653 	view->ncols = COLS;
3654 	err = view_resize(view);
3655 	if (err)
3656 		return err;
3657 
3658 	err = offset_selection_down(view);
3659 
3660 	return err;
3661 }
3662 
3663 static const struct got_error *
3664 log_goto_line(struct tog_view *view, int nlines)
3665 {
3666 	const struct got_error		*err = NULL;
3667 	struct tog_log_view_state	*s = &view->state.log;
3668 	int				 g, idx = s->selected_entry->idx;
3669 
3670 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3671 		return NULL;
3672 
3673 	g = view->gline;
3674 	view->gline = 0;
3675 
3676 	if (g >= s->first_displayed_entry->idx + 1 &&
3677 	    g <= s->last_displayed_entry->idx + 1 &&
3678 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3679 		s->selected = g - s->first_displayed_entry->idx - 1;
3680 		select_commit(s);
3681 		return NULL;
3682 	}
3683 
3684 	if (idx + 1 < g) {
3685 		err = log_move_cursor_down(view, g - idx - 1);
3686 		if (!err && g > s->selected_entry->idx + 1)
3687 			err = log_move_cursor_down(view,
3688 			    g - s->first_displayed_entry->idx - 1);
3689 		if (err)
3690 			return err;
3691 	} else if (idx + 1 > g)
3692 		log_move_cursor_up(view, idx - g + 1, 0);
3693 
3694 	if (g < nlines && s->first_displayed_entry->idx == 0)
3695 		s->selected = g - 1;
3696 
3697 	select_commit(s);
3698 	return NULL;
3699 
3700 }
3701 
3702 static void
3703 horizontal_scroll_input(struct tog_view *view, int ch)
3704 {
3705 
3706 	switch (ch) {
3707 	case KEY_LEFT:
3708 	case 'h':
3709 		view->x -= MIN(view->x, 2);
3710 		if (view->x <= 0)
3711 			view->count = 0;
3712 		break;
3713 	case KEY_RIGHT:
3714 	case 'l':
3715 		if (view->x + view->ncols / 2 < view->maxx)
3716 			view->x += 2;
3717 		else
3718 			view->count = 0;
3719 		break;
3720 	case '0':
3721 		view->x = 0;
3722 		break;
3723 	case '$':
3724 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3725 		view->count = 0;
3726 		break;
3727 	default:
3728 		break;
3729 	}
3730 }
3731 
3732 static const struct got_error *
3733 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3734 {
3735 	const struct got_error *err = NULL;
3736 	struct tog_log_view_state *s = &view->state.log;
3737 	int eos, nscroll;
3738 
3739 	if (s->thread_args.load_all) {
3740 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3741 			s->thread_args.load_all = 0;
3742 		else if (s->thread_args.log_complete) {
3743 			err = log_move_cursor_down(view, s->commits->ncommits);
3744 			s->thread_args.load_all = 0;
3745 		}
3746 		if (err)
3747 			return err;
3748 	}
3749 
3750 	eos = nscroll = view->nlines - 1;
3751 	if (view_is_hsplit_top(view))
3752 		--eos;  /* border */
3753 
3754 	if (view->gline)
3755 		return log_goto_line(view, eos);
3756 
3757 	switch (ch) {
3758 	case '&':
3759 		err = limit_log_view(view);
3760 		break;
3761 	case 'q':
3762 		s->quit = 1;
3763 		break;
3764 	case '0':
3765 	case '$':
3766 	case KEY_RIGHT:
3767 	case 'l':
3768 	case KEY_LEFT:
3769 	case 'h':
3770 		horizontal_scroll_input(view, ch);
3771 		break;
3772 	case 'k':
3773 	case KEY_UP:
3774 	case '<':
3775 	case ',':
3776 	case CTRL('p'):
3777 		log_move_cursor_up(view, 0, 0);
3778 		break;
3779 	case 'g':
3780 	case '=':
3781 	case KEY_HOME:
3782 		log_move_cursor_up(view, 0, 1);
3783 		view->count = 0;
3784 		break;
3785 	case CTRL('u'):
3786 	case 'u':
3787 		nscroll /= 2;
3788 		/* FALL THROUGH */
3789 	case KEY_PPAGE:
3790 	case CTRL('b'):
3791 	case 'b':
3792 		log_move_cursor_up(view, nscroll, 0);
3793 		break;
3794 	case 'j':
3795 	case KEY_DOWN:
3796 	case '>':
3797 	case '.':
3798 	case CTRL('n'):
3799 		err = log_move_cursor_down(view, 0);
3800 		break;
3801 	case '@':
3802 		s->use_committer = !s->use_committer;
3803 		view->action = s->use_committer ?
3804 		    "show committer" : "show commit author";
3805 		break;
3806 	case 'G':
3807 	case '*':
3808 	case KEY_END: {
3809 		/* We don't know yet how many commits, so we're forced to
3810 		 * traverse them all. */
3811 		view->count = 0;
3812 		s->thread_args.load_all = 1;
3813 		if (!s->thread_args.log_complete)
3814 			return trigger_log_thread(view, 0);
3815 		err = log_move_cursor_down(view, s->commits->ncommits);
3816 		s->thread_args.load_all = 0;
3817 		break;
3818 	}
3819 	case CTRL('d'):
3820 	case 'd':
3821 		nscroll /= 2;
3822 		/* FALL THROUGH */
3823 	case KEY_NPAGE:
3824 	case CTRL('f'):
3825 	case 'f':
3826 	case ' ':
3827 		err = log_move_cursor_down(view, nscroll);
3828 		break;
3829 	case KEY_RESIZE:
3830 		if (s->selected > view->nlines - 2)
3831 			s->selected = view->nlines - 2;
3832 		if (s->selected > s->commits->ncommits - 1)
3833 			s->selected = s->commits->ncommits - 1;
3834 		select_commit(s);
3835 		if (s->commits->ncommits < view->nlines - 1 &&
3836 		    !s->thread_args.log_complete) {
3837 			s->thread_args.commits_needed += (view->nlines - 1) -
3838 			    s->commits->ncommits;
3839 			err = trigger_log_thread(view, 1);
3840 		}
3841 		break;
3842 	case KEY_ENTER:
3843 	case '\r':
3844 		view->count = 0;
3845 		if (s->selected_entry == NULL)
3846 			break;
3847 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3848 		break;
3849 	case 'T':
3850 		view->count = 0;
3851 		if (s->selected_entry == NULL)
3852 			break;
3853 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3854 		break;
3855 	case KEY_BACKSPACE:
3856 	case CTRL('l'):
3857 	case 'B':
3858 		view->count = 0;
3859 		if (ch == KEY_BACKSPACE &&
3860 		    got_path_is_root_dir(s->in_repo_path))
3861 			break;
3862 		err = stop_log_thread(s);
3863 		if (err)
3864 			return err;
3865 		if (ch == KEY_BACKSPACE) {
3866 			char *parent_path;
3867 			err = got_path_dirname(&parent_path, s->in_repo_path);
3868 			if (err)
3869 				return err;
3870 			free(s->in_repo_path);
3871 			s->in_repo_path = parent_path;
3872 			s->thread_args.in_repo_path = s->in_repo_path;
3873 		} else if (ch == CTRL('l')) {
3874 			struct got_object_id *start_id;
3875 			err = got_repo_match_object_id(&start_id, NULL,
3876 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3877 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3878 			if (err) {
3879 				if (s->head_ref_name == NULL ||
3880 				    err->code != GOT_ERR_NOT_REF)
3881 					return err;
3882 				/* Try to cope with deleted references. */
3883 				free(s->head_ref_name);
3884 				s->head_ref_name = NULL;
3885 				err = got_repo_match_object_id(&start_id,
3886 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3887 				    &tog_refs, s->repo);
3888 				if (err)
3889 					return err;
3890 			}
3891 			free(s->start_id);
3892 			s->start_id = start_id;
3893 			s->thread_args.start_id = s->start_id;
3894 		} else /* 'B' */
3895 			s->log_branches = !s->log_branches;
3896 
3897 		if (s->thread_args.pack_fds == NULL) {
3898 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3899 			if (err)
3900 				return err;
3901 		}
3902 		err = got_repo_open(&s->thread_args.repo,
3903 		    got_repo_get_path(s->repo), NULL,
3904 		    s->thread_args.pack_fds);
3905 		if (err)
3906 			return err;
3907 		tog_free_refs();
3908 		err = tog_load_refs(s->repo, 0);
3909 		if (err)
3910 			return err;
3911 		err = got_commit_graph_open(&s->thread_args.graph,
3912 		    s->in_repo_path, !s->log_branches);
3913 		if (err)
3914 			return err;
3915 		err = got_commit_graph_iter_start(s->thread_args.graph,
3916 		    s->start_id, s->repo, NULL, NULL);
3917 		if (err)
3918 			return err;
3919 		free_commits(&s->real_commits);
3920 		free_commits(&s->limit_commits);
3921 		s->first_displayed_entry = NULL;
3922 		s->last_displayed_entry = NULL;
3923 		s->selected_entry = NULL;
3924 		s->selected = 0;
3925 		s->thread_args.log_complete = 0;
3926 		s->quit = 0;
3927 		s->thread_args.commits_needed = view->lines;
3928 		s->matched_entry = NULL;
3929 		s->search_entry = NULL;
3930 		view->offset = 0;
3931 		break;
3932 	case 'R':
3933 		view->count = 0;
3934 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3935 		break;
3936 	default:
3937 		view->count = 0;
3938 		break;
3939 	}
3940 
3941 	return err;
3942 }
3943 
3944 static const struct got_error *
3945 apply_unveil(const char *repo_path, const char *worktree_path)
3946 {
3947 	const struct got_error *error;
3948 
3949 #ifdef PROFILE
3950 	if (unveil("gmon.out", "rwc") != 0)
3951 		return got_error_from_errno2("unveil", "gmon.out");
3952 #endif
3953 	if (repo_path && unveil(repo_path, "r") != 0)
3954 		return got_error_from_errno2("unveil", repo_path);
3955 
3956 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3957 		return got_error_from_errno2("unveil", worktree_path);
3958 
3959 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3960 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3961 
3962 	error = got_privsep_unveil_exec_helpers();
3963 	if (error != NULL)
3964 		return error;
3965 
3966 	if (unveil(NULL, NULL) != 0)
3967 		return got_error_from_errno("unveil");
3968 
3969 	return NULL;
3970 }
3971 
3972 static void
3973 init_curses(void)
3974 {
3975 	/*
3976 	 * Override default signal handlers before starting ncurses.
3977 	 * This should prevent ncurses from installing its own
3978 	 * broken cleanup() signal handler.
3979 	 */
3980 	signal(SIGWINCH, tog_sigwinch);
3981 	signal(SIGPIPE, tog_sigpipe);
3982 	signal(SIGCONT, tog_sigcont);
3983 	signal(SIGINT, tog_sigint);
3984 	signal(SIGTERM, tog_sigterm);
3985 
3986 	initscr();
3987 	cbreak();
3988 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3989 	noecho();
3990 	nonl();
3991 	intrflush(stdscr, FALSE);
3992 	keypad(stdscr, TRUE);
3993 	curs_set(0);
3994 	if (getenv("TOG_COLORS") != NULL) {
3995 		start_color();
3996 		use_default_colors();
3997 	}
3998 }
3999 
4000 static const struct got_error *
4001 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4002     struct got_repository *repo, struct got_worktree *worktree)
4003 {
4004 	const struct got_error *err = NULL;
4005 
4006 	if (argc == 0) {
4007 		*in_repo_path = strdup("/");
4008 		if (*in_repo_path == NULL)
4009 			return got_error_from_errno("strdup");
4010 		return NULL;
4011 	}
4012 
4013 	if (worktree) {
4014 		const char *prefix = got_worktree_get_path_prefix(worktree);
4015 		char *p;
4016 
4017 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4018 		if (err)
4019 			return err;
4020 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4021 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4022 		    p) == -1) {
4023 			err = got_error_from_errno("asprintf");
4024 			*in_repo_path = NULL;
4025 		}
4026 		free(p);
4027 	} else
4028 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4029 
4030 	return err;
4031 }
4032 
4033 static const struct got_error *
4034 cmd_log(int argc, char *argv[])
4035 {
4036 	const struct got_error *error;
4037 	struct got_repository *repo = NULL;
4038 	struct got_worktree *worktree = NULL;
4039 	struct got_object_id *start_id = NULL;
4040 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4041 	char *start_commit = NULL, *label = NULL;
4042 	struct got_reference *ref = NULL;
4043 	const char *head_ref_name = NULL;
4044 	int ch, log_branches = 0;
4045 	struct tog_view *view;
4046 	int *pack_fds = NULL;
4047 
4048 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4049 		switch (ch) {
4050 		case 'b':
4051 			log_branches = 1;
4052 			break;
4053 		case 'c':
4054 			start_commit = optarg;
4055 			break;
4056 		case 'r':
4057 			repo_path = realpath(optarg, NULL);
4058 			if (repo_path == NULL)
4059 				return got_error_from_errno2("realpath",
4060 				    optarg);
4061 			break;
4062 		default:
4063 			usage_log();
4064 			/* NOTREACHED */
4065 		}
4066 	}
4067 
4068 	argc -= optind;
4069 	argv += optind;
4070 
4071 	if (argc > 1)
4072 		usage_log();
4073 
4074 	error = got_repo_pack_fds_open(&pack_fds);
4075 	if (error != NULL)
4076 		goto done;
4077 
4078 	if (repo_path == NULL) {
4079 		cwd = getcwd(NULL, 0);
4080 		if (cwd == NULL)
4081 			return got_error_from_errno("getcwd");
4082 		error = got_worktree_open(&worktree, cwd);
4083 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4084 			goto done;
4085 		if (worktree)
4086 			repo_path =
4087 			    strdup(got_worktree_get_repo_path(worktree));
4088 		else
4089 			repo_path = strdup(cwd);
4090 		if (repo_path == NULL) {
4091 			error = got_error_from_errno("strdup");
4092 			goto done;
4093 		}
4094 	}
4095 
4096 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4097 	if (error != NULL)
4098 		goto done;
4099 
4100 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4101 	    repo, worktree);
4102 	if (error)
4103 		goto done;
4104 
4105 	init_curses();
4106 
4107 	error = apply_unveil(got_repo_get_path(repo),
4108 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4109 	if (error)
4110 		goto done;
4111 
4112 	/* already loaded by tog_log_with_path()? */
4113 	if (TAILQ_EMPTY(&tog_refs)) {
4114 		error = tog_load_refs(repo, 0);
4115 		if (error)
4116 			goto done;
4117 	}
4118 
4119 	if (start_commit == NULL) {
4120 		error = got_repo_match_object_id(&start_id, &label,
4121 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4122 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4123 		if (error)
4124 			goto done;
4125 		head_ref_name = label;
4126 	} else {
4127 		error = got_ref_open(&ref, repo, start_commit, 0);
4128 		if (error == NULL)
4129 			head_ref_name = got_ref_get_name(ref);
4130 		else if (error->code != GOT_ERR_NOT_REF)
4131 			goto done;
4132 		error = got_repo_match_object_id(&start_id, NULL,
4133 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4134 		if (error)
4135 			goto done;
4136 	}
4137 
4138 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4139 	if (view == NULL) {
4140 		error = got_error_from_errno("view_open");
4141 		goto done;
4142 	}
4143 	error = open_log_view(view, start_id, repo, head_ref_name,
4144 	    in_repo_path, log_branches);
4145 	if (error)
4146 		goto done;
4147 	if (worktree) {
4148 		/* Release work tree lock. */
4149 		got_worktree_close(worktree);
4150 		worktree = NULL;
4151 	}
4152 	error = view_loop(view);
4153 done:
4154 	free(in_repo_path);
4155 	free(repo_path);
4156 	free(cwd);
4157 	free(start_id);
4158 	free(label);
4159 	if (ref)
4160 		got_ref_close(ref);
4161 	if (repo) {
4162 		const struct got_error *close_err = got_repo_close(repo);
4163 		if (error == NULL)
4164 			error = close_err;
4165 	}
4166 	if (worktree)
4167 		got_worktree_close(worktree);
4168 	if (pack_fds) {
4169 		const struct got_error *pack_err =
4170 		    got_repo_pack_fds_close(pack_fds);
4171 		if (error == NULL)
4172 			error = pack_err;
4173 	}
4174 	tog_free_refs();
4175 	return error;
4176 }
4177 
4178 __dead static void
4179 usage_diff(void)
4180 {
4181 	endwin();
4182 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4183 	    "object1 object2\n", getprogname());
4184 	exit(1);
4185 }
4186 
4187 static int
4188 match_line(const char *line, regex_t *regex, size_t nmatch,
4189     regmatch_t *regmatch)
4190 {
4191 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4192 }
4193 
4194 static struct tog_color *
4195 match_color(struct tog_colors *colors, const char *line)
4196 {
4197 	struct tog_color *tc = NULL;
4198 
4199 	STAILQ_FOREACH(tc, colors, entry) {
4200 		if (match_line(line, &tc->regex, 0, NULL))
4201 			return tc;
4202 	}
4203 
4204 	return NULL;
4205 }
4206 
4207 static const struct got_error *
4208 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4209     WINDOW *window, int skipcol, regmatch_t *regmatch)
4210 {
4211 	const struct got_error *err = NULL;
4212 	char *exstr = NULL;
4213 	wchar_t *wline = NULL;
4214 	int rme, rms, n, width, scrollx;
4215 	int width0 = 0, width1 = 0, width2 = 0;
4216 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4217 
4218 	*wtotal = 0;
4219 
4220 	rms = regmatch->rm_so;
4221 	rme = regmatch->rm_eo;
4222 
4223 	err = expand_tab(&exstr, line);
4224 	if (err)
4225 		return err;
4226 
4227 	/* Split the line into 3 segments, according to match offsets. */
4228 	seg0 = strndup(exstr, rms);
4229 	if (seg0 == NULL) {
4230 		err = got_error_from_errno("strndup");
4231 		goto done;
4232 	}
4233 	seg1 = strndup(exstr + rms, rme - rms);
4234 	if (seg1 == NULL) {
4235 		err = got_error_from_errno("strndup");
4236 		goto done;
4237 	}
4238 	seg2 = strdup(exstr + rme);
4239 	if (seg2 == NULL) {
4240 		err = got_error_from_errno("strndup");
4241 		goto done;
4242 	}
4243 
4244 	/* draw up to matched token if we haven't scrolled past it */
4245 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4246 	    col_tab_align, 1);
4247 	if (err)
4248 		goto done;
4249 	n = MAX(width0 - skipcol, 0);
4250 	if (n) {
4251 		free(wline);
4252 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4253 		    wlimit, col_tab_align, 1);
4254 		if (err)
4255 			goto done;
4256 		waddwstr(window, &wline[scrollx]);
4257 		wlimit -= width;
4258 		*wtotal += width;
4259 	}
4260 
4261 	if (wlimit > 0) {
4262 		int i = 0, w = 0;
4263 		size_t wlen;
4264 
4265 		free(wline);
4266 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4267 		    col_tab_align, 1);
4268 		if (err)
4269 			goto done;
4270 		wlen = wcslen(wline);
4271 		while (i < wlen) {
4272 			width = wcwidth(wline[i]);
4273 			if (width == -1) {
4274 				/* should not happen, tabs are expanded */
4275 				err = got_error(GOT_ERR_RANGE);
4276 				goto done;
4277 			}
4278 			if (width0 + w + width > skipcol)
4279 				break;
4280 			w += width;
4281 			i++;
4282 		}
4283 		/* draw (visible part of) matched token (if scrolled into it) */
4284 		if (width1 - w > 0) {
4285 			wattron(window, A_STANDOUT);
4286 			waddwstr(window, &wline[i]);
4287 			wattroff(window, A_STANDOUT);
4288 			wlimit -= (width1 - w);
4289 			*wtotal += (width1 - w);
4290 		}
4291 	}
4292 
4293 	if (wlimit > 0) {  /* draw rest of line */
4294 		free(wline);
4295 		if (skipcol > width0 + width1) {
4296 			err = format_line(&wline, &width2, &scrollx, seg2,
4297 			    skipcol - (width0 + width1), wlimit,
4298 			    col_tab_align, 1);
4299 			if (err)
4300 				goto done;
4301 			waddwstr(window, &wline[scrollx]);
4302 		} else {
4303 			err = format_line(&wline, &width2, NULL, seg2, 0,
4304 			    wlimit, col_tab_align, 1);
4305 			if (err)
4306 				goto done;
4307 			waddwstr(window, wline);
4308 		}
4309 		*wtotal += width2;
4310 	}
4311 done:
4312 	free(wline);
4313 	free(exstr);
4314 	free(seg0);
4315 	free(seg1);
4316 	free(seg2);
4317 	return err;
4318 }
4319 
4320 static int
4321 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4322 {
4323 	FILE	*f = NULL;
4324 	int	*eof, *first, *selected;
4325 
4326 	if (view->type == TOG_VIEW_DIFF) {
4327 		struct tog_diff_view_state *s = &view->state.diff;
4328 
4329 		first = &s->first_displayed_line;
4330 		selected = first;
4331 		eof = &s->eof;
4332 		f = s->f;
4333 	} else if (view->type == TOG_VIEW_HELP) {
4334 		struct tog_help_view_state *s = &view->state.help;
4335 
4336 		first = &s->first_displayed_line;
4337 		selected = first;
4338 		eof = &s->eof;
4339 		f = s->f;
4340 	} else if (view->type == TOG_VIEW_BLAME) {
4341 		struct tog_blame_view_state *s = &view->state.blame;
4342 
4343 		first = &s->first_displayed_line;
4344 		selected = &s->selected_line;
4345 		eof = &s->eof;
4346 		f = s->blame.f;
4347 	} else
4348 		return 0;
4349 
4350 	/* Center gline in the middle of the page like vi(1). */
4351 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4352 		return 0;
4353 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4354 		rewind(f);
4355 		*eof = 0;
4356 		*first = 1;
4357 		*lineno = 0;
4358 		*nprinted = 0;
4359 		return 0;
4360 	}
4361 
4362 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4363 		view->gline : (view->nlines - 3) / 2 + 1;
4364 	view->gline = 0;
4365 
4366 	return 1;
4367 }
4368 
4369 static const struct got_error *
4370 draw_file(struct tog_view *view, const char *header)
4371 {
4372 	struct tog_diff_view_state *s = &view->state.diff;
4373 	regmatch_t *regmatch = &view->regmatch;
4374 	const struct got_error *err;
4375 	int nprinted = 0;
4376 	char *line;
4377 	size_t linesize = 0;
4378 	ssize_t linelen;
4379 	wchar_t *wline;
4380 	int width;
4381 	int max_lines = view->nlines;
4382 	int nlines = s->nlines;
4383 	off_t line_offset;
4384 
4385 	s->lineno = s->first_displayed_line - 1;
4386 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4387 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4388 		return got_error_from_errno("fseek");
4389 
4390 	werase(view->window);
4391 
4392 	if (view->gline > s->nlines - 1)
4393 		view->gline = s->nlines - 1;
4394 
4395 	if (header) {
4396 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4397 		    1 : view->gline - (view->nlines - 3) / 2 :
4398 		    s->lineno + s->selected_line;
4399 
4400 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4401 			return got_error_from_errno("asprintf");
4402 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4403 		    0, 0);
4404 		free(line);
4405 		if (err)
4406 			return err;
4407 
4408 		if (view_needs_focus_indication(view))
4409 			wstandout(view->window);
4410 		waddwstr(view->window, wline);
4411 		free(wline);
4412 		wline = NULL;
4413 		while (width++ < view->ncols)
4414 			waddch(view->window, ' ');
4415 		if (view_needs_focus_indication(view))
4416 			wstandend(view->window);
4417 
4418 		if (max_lines <= 1)
4419 			return NULL;
4420 		max_lines--;
4421 	}
4422 
4423 	s->eof = 0;
4424 	view->maxx = 0;
4425 	line = NULL;
4426 	while (max_lines > 0 && nprinted < max_lines) {
4427 		enum got_diff_line_type linetype;
4428 		attr_t attr = 0;
4429 
4430 		linelen = getline(&line, &linesize, s->f);
4431 		if (linelen == -1) {
4432 			if (feof(s->f)) {
4433 				s->eof = 1;
4434 				break;
4435 			}
4436 			free(line);
4437 			return got_ferror(s->f, GOT_ERR_IO);
4438 		}
4439 
4440 		if (++s->lineno < s->first_displayed_line)
4441 			continue;
4442 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4443 			continue;
4444 		if (s->lineno == view->hiline)
4445 			attr = A_STANDOUT;
4446 
4447 		/* Set view->maxx based on full line length. */
4448 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4449 		    view->x ? 1 : 0);
4450 		if (err) {
4451 			free(line);
4452 			return err;
4453 		}
4454 		view->maxx = MAX(view->maxx, width);
4455 		free(wline);
4456 		wline = NULL;
4457 
4458 		linetype = s->lines[s->lineno].type;
4459 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4460 		    linetype < GOT_DIFF_LINE_CONTEXT)
4461 			attr |= COLOR_PAIR(linetype);
4462 		if (attr)
4463 			wattron(view->window, attr);
4464 		if (s->first_displayed_line + nprinted == s->matched_line &&
4465 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4466 			err = add_matched_line(&width, line, view->ncols, 0,
4467 			    view->window, view->x, regmatch);
4468 			if (err) {
4469 				free(line);
4470 				return err;
4471 			}
4472 		} else {
4473 			int skip;
4474 			err = format_line(&wline, &width, &skip, line,
4475 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4476 			if (err) {
4477 				free(line);
4478 				return err;
4479 			}
4480 			waddwstr(view->window, &wline[skip]);
4481 			free(wline);
4482 			wline = NULL;
4483 		}
4484 		if (s->lineno == view->hiline) {
4485 			/* highlight full gline length */
4486 			while (width++ < view->ncols)
4487 				waddch(view->window, ' ');
4488 		} else {
4489 			if (width <= view->ncols - 1)
4490 				waddch(view->window, '\n');
4491 		}
4492 		if (attr)
4493 			wattroff(view->window, attr);
4494 		if (++nprinted == 1)
4495 			s->first_displayed_line = s->lineno;
4496 	}
4497 	free(line);
4498 	if (nprinted >= 1)
4499 		s->last_displayed_line = s->first_displayed_line +
4500 		    (nprinted - 1);
4501 	else
4502 		s->last_displayed_line = s->first_displayed_line;
4503 
4504 	view_border(view);
4505 
4506 	if (s->eof) {
4507 		while (nprinted < view->nlines) {
4508 			waddch(view->window, '\n');
4509 			nprinted++;
4510 		}
4511 
4512 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4513 		    view->ncols, 0, 0);
4514 		if (err) {
4515 			return err;
4516 		}
4517 
4518 		wstandout(view->window);
4519 		waddwstr(view->window, wline);
4520 		free(wline);
4521 		wline = NULL;
4522 		wstandend(view->window);
4523 	}
4524 
4525 	return NULL;
4526 }
4527 
4528 static char *
4529 get_datestr(time_t *time, char *datebuf)
4530 {
4531 	struct tm mytm, *tm;
4532 	char *p, *s;
4533 
4534 	tm = gmtime_r(time, &mytm);
4535 	if (tm == NULL)
4536 		return NULL;
4537 	s = asctime_r(tm, datebuf);
4538 	if (s == NULL)
4539 		return NULL;
4540 	p = strchr(s, '\n');
4541 	if (p)
4542 		*p = '\0';
4543 	return s;
4544 }
4545 
4546 static const struct got_error *
4547 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4548     off_t off, uint8_t type)
4549 {
4550 	struct got_diff_line *p;
4551 
4552 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4553 	if (p == NULL)
4554 		return got_error_from_errno("reallocarray");
4555 	*lines = p;
4556 	(*lines)[*nlines].offset = off;
4557 	(*lines)[*nlines].type = type;
4558 	(*nlines)++;
4559 
4560 	return NULL;
4561 }
4562 
4563 static const struct got_error *
4564 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4565     struct got_diff_line *s_lines, size_t s_nlines)
4566 {
4567 	struct got_diff_line	*p;
4568 	char			 buf[BUFSIZ];
4569 	size_t			 i, r;
4570 
4571 	if (fseeko(src, 0L, SEEK_SET) == -1)
4572 		return got_error_from_errno("fseeko");
4573 
4574 	for (;;) {
4575 		r = fread(buf, 1, sizeof(buf), src);
4576 		if (r == 0) {
4577 			if (ferror(src))
4578 				return got_error_from_errno("fread");
4579 			if (feof(src))
4580 				break;
4581 		}
4582 		if (fwrite(buf, 1, r, dst) != r)
4583 			return got_ferror(dst, GOT_ERR_IO);
4584 	}
4585 
4586 	if (s_nlines == 0 && *d_nlines == 0)
4587 		return NULL;
4588 
4589 	/*
4590 	 * If commit info was in dst, increment line offsets
4591 	 * of the appended diff content, but skip s_lines[0]
4592 	 * because offset zero is already in *d_lines.
4593 	 */
4594 	if (*d_nlines > 0) {
4595 		for (i = 1; i < s_nlines; ++i)
4596 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4597 
4598 		if (s_nlines > 0) {
4599 			--s_nlines;
4600 			++s_lines;
4601 		}
4602 	}
4603 
4604 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4605 	if (p == NULL) {
4606 		/* d_lines is freed in close_diff_view() */
4607 		return got_error_from_errno("reallocarray");
4608 	}
4609 
4610 	*d_lines = p;
4611 
4612 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4613 	*d_nlines += s_nlines;
4614 
4615 	return NULL;
4616 }
4617 
4618 static const struct got_error *
4619 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4620     struct got_object_id *commit_id, struct got_reflist_head *refs,
4621     struct got_repository *repo, int ignore_ws, int force_text_diff,
4622     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4623 {
4624 	const struct got_error *err = NULL;
4625 	char datebuf[26], *datestr;
4626 	struct got_commit_object *commit;
4627 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4628 	time_t committer_time;
4629 	const char *author, *committer;
4630 	char *refs_str = NULL;
4631 	struct got_pathlist_entry *pe;
4632 	off_t outoff = 0;
4633 	int n;
4634 
4635 	if (refs) {
4636 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4637 		if (err)
4638 			return err;
4639 	}
4640 
4641 	err = got_object_open_as_commit(&commit, repo, commit_id);
4642 	if (err)
4643 		return err;
4644 
4645 	err = got_object_id_str(&id_str, commit_id);
4646 	if (err) {
4647 		err = got_error_from_errno("got_object_id_str");
4648 		goto done;
4649 	}
4650 
4651 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4652 	if (err)
4653 		goto done;
4654 
4655 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4656 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4657 	if (n < 0) {
4658 		err = got_error_from_errno("fprintf");
4659 		goto done;
4660 	}
4661 	outoff += n;
4662 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4663 	if (err)
4664 		goto done;
4665 
4666 	n = fprintf(outfile, "from: %s\n",
4667 	    got_object_commit_get_author(commit));
4668 	if (n < 0) {
4669 		err = got_error_from_errno("fprintf");
4670 		goto done;
4671 	}
4672 	outoff += n;
4673 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4674 	if (err)
4675 		goto done;
4676 
4677 	author = got_object_commit_get_author(commit);
4678 	committer = got_object_commit_get_committer(commit);
4679 	if (strcmp(author, committer) != 0) {
4680 		n = fprintf(outfile, "via: %s\n", committer);
4681 		if (n < 0) {
4682 			err = got_error_from_errno("fprintf");
4683 			goto done;
4684 		}
4685 		outoff += n;
4686 		err = add_line_metadata(lines, nlines, outoff,
4687 		    GOT_DIFF_LINE_AUTHOR);
4688 		if (err)
4689 			goto done;
4690 	}
4691 	committer_time = got_object_commit_get_committer_time(commit);
4692 	datestr = get_datestr(&committer_time, datebuf);
4693 	if (datestr) {
4694 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4695 		if (n < 0) {
4696 			err = got_error_from_errno("fprintf");
4697 			goto done;
4698 		}
4699 		outoff += n;
4700 		err = add_line_metadata(lines, nlines, outoff,
4701 		    GOT_DIFF_LINE_DATE);
4702 		if (err)
4703 			goto done;
4704 	}
4705 	if (got_object_commit_get_nparents(commit) > 1) {
4706 		const struct got_object_id_queue *parent_ids;
4707 		struct got_object_qid *qid;
4708 		int pn = 1;
4709 		parent_ids = got_object_commit_get_parent_ids(commit);
4710 		STAILQ_FOREACH(qid, parent_ids, entry) {
4711 			err = got_object_id_str(&id_str, &qid->id);
4712 			if (err)
4713 				goto done;
4714 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4715 			if (n < 0) {
4716 				err = got_error_from_errno("fprintf");
4717 				goto done;
4718 			}
4719 			outoff += n;
4720 			err = add_line_metadata(lines, nlines, outoff,
4721 			    GOT_DIFF_LINE_META);
4722 			if (err)
4723 				goto done;
4724 			free(id_str);
4725 			id_str = NULL;
4726 		}
4727 	}
4728 
4729 	err = got_object_commit_get_logmsg(&logmsg, commit);
4730 	if (err)
4731 		goto done;
4732 	s = logmsg;
4733 	while ((line = strsep(&s, "\n")) != NULL) {
4734 		n = fprintf(outfile, "%s\n", line);
4735 		if (n < 0) {
4736 			err = got_error_from_errno("fprintf");
4737 			goto done;
4738 		}
4739 		outoff += n;
4740 		err = add_line_metadata(lines, nlines, outoff,
4741 		    GOT_DIFF_LINE_LOGMSG);
4742 		if (err)
4743 			goto done;
4744 	}
4745 
4746 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4747 		struct got_diff_changed_path *cp = pe->data;
4748 		int pad = dsa->max_path_len - pe->path_len + 1;
4749 
4750 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4751 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4752 		    dsa->rm_cols + 1, cp->rm);
4753 		if (n < 0) {
4754 			err = got_error_from_errno("fprintf");
4755 			goto done;
4756 		}
4757 		outoff += n;
4758 		err = add_line_metadata(lines, nlines, outoff,
4759 		    GOT_DIFF_LINE_CHANGES);
4760 		if (err)
4761 			goto done;
4762 	}
4763 
4764 	fputc('\n', outfile);
4765 	outoff++;
4766 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4767 	if (err)
4768 		goto done;
4769 
4770 	n = fprintf(outfile,
4771 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4772 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
4773 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
4774 	if (n < 0) {
4775 		err = got_error_from_errno("fprintf");
4776 		goto done;
4777 	}
4778 	outoff += n;
4779 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4780 	if (err)
4781 		goto done;
4782 
4783 	fputc('\n', outfile);
4784 	outoff++;
4785 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4786 done:
4787 	free(id_str);
4788 	free(logmsg);
4789 	free(refs_str);
4790 	got_object_commit_close(commit);
4791 	if (err) {
4792 		free(*lines);
4793 		*lines = NULL;
4794 		*nlines = 0;
4795 	}
4796 	return err;
4797 }
4798 
4799 static const struct got_error *
4800 create_diff(struct tog_diff_view_state *s)
4801 {
4802 	const struct got_error *err = NULL;
4803 	FILE *f = NULL, *tmp_diff_file = NULL;
4804 	int obj_type;
4805 	struct got_diff_line *lines = NULL;
4806 	struct got_pathlist_head changed_paths;
4807 
4808 	TAILQ_INIT(&changed_paths);
4809 
4810 	free(s->lines);
4811 	s->lines = malloc(sizeof(*s->lines));
4812 	if (s->lines == NULL)
4813 		return got_error_from_errno("malloc");
4814 	s->nlines = 0;
4815 
4816 	f = got_opentemp();
4817 	if (f == NULL) {
4818 		err = got_error_from_errno("got_opentemp");
4819 		goto done;
4820 	}
4821 	tmp_diff_file = got_opentemp();
4822 	if (tmp_diff_file == NULL) {
4823 		err = got_error_from_errno("got_opentemp");
4824 		goto done;
4825 	}
4826 	if (s->f && fclose(s->f) == EOF) {
4827 		err = got_error_from_errno("fclose");
4828 		goto done;
4829 	}
4830 	s->f = f;
4831 
4832 	if (s->id1)
4833 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4834 	else
4835 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4836 	if (err)
4837 		goto done;
4838 
4839 	switch (obj_type) {
4840 	case GOT_OBJ_TYPE_BLOB:
4841 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4842 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4843 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4844 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
4845 		    s->f);
4846 		break;
4847 	case GOT_OBJ_TYPE_TREE:
4848 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4849 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4850 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4851 		    s->force_text_diff, NULL, s->repo, s->f);
4852 		break;
4853 	case GOT_OBJ_TYPE_COMMIT: {
4854 		const struct got_object_id_queue *parent_ids;
4855 		struct got_object_qid *pid;
4856 		struct got_commit_object *commit2;
4857 		struct got_reflist_head *refs;
4858 		size_t nlines = 0;
4859 		struct got_diffstat_cb_arg dsa = {
4860 			0, 0, 0, 0, 0, 0,
4861 			&changed_paths,
4862 			s->ignore_whitespace,
4863 			s->force_text_diff,
4864 			tog_diff_algo
4865 		};
4866 
4867 		lines = malloc(sizeof(*lines));
4868 		if (lines == NULL) {
4869 			err = got_error_from_errno("malloc");
4870 			goto done;
4871 		}
4872 
4873 		/* build diff first in tmp file then append to commit info */
4874 		err = got_diff_objects_as_commits(&lines, &nlines,
4875 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4876 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4877 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
4878 		if (err)
4879 			break;
4880 
4881 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4882 		if (err)
4883 			goto done;
4884 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4885 		/* Show commit info if we're diffing to a parent/root commit. */
4886 		if (s->id1 == NULL) {
4887 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4888 			    refs, s->repo, s->ignore_whitespace,
4889 			    s->force_text_diff, &dsa, s->f);
4890 			if (err)
4891 				goto done;
4892 		} else {
4893 			parent_ids = got_object_commit_get_parent_ids(commit2);
4894 			STAILQ_FOREACH(pid, parent_ids, entry) {
4895 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4896 					err = write_commit_info(&s->lines,
4897 					    &s->nlines, s->id2, refs, s->repo,
4898 					    s->ignore_whitespace,
4899 					    s->force_text_diff, &dsa, s->f);
4900 					if (err)
4901 						goto done;
4902 					break;
4903 				}
4904 			}
4905 		}
4906 		got_object_commit_close(commit2);
4907 
4908 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
4909 		    lines, nlines);
4910 		break;
4911 	}
4912 	default:
4913 		err = got_error(GOT_ERR_OBJ_TYPE);
4914 		break;
4915 	}
4916 done:
4917 	free(lines);
4918 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4919 	if (s->f && fflush(s->f) != 0 && err == NULL)
4920 		err = got_error_from_errno("fflush");
4921 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
4922 		err = got_error_from_errno("fclose");
4923 	return err;
4924 }
4925 
4926 static void
4927 diff_view_indicate_progress(struct tog_view *view)
4928 {
4929 	mvwaddstr(view->window, 0, 0, "diffing...");
4930 	update_panels();
4931 	doupdate();
4932 }
4933 
4934 static const struct got_error *
4935 search_start_diff_view(struct tog_view *view)
4936 {
4937 	struct tog_diff_view_state *s = &view->state.diff;
4938 
4939 	s->matched_line = 0;
4940 	return NULL;
4941 }
4942 
4943 static void
4944 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4945     size_t *nlines, int **first, int **last, int **match, int **selected)
4946 {
4947 	struct tog_diff_view_state *s = &view->state.diff;
4948 
4949 	*f = s->f;
4950 	*nlines = s->nlines;
4951 	*line_offsets = NULL;
4952 	*match = &s->matched_line;
4953 	*first = &s->first_displayed_line;
4954 	*last = &s->last_displayed_line;
4955 	*selected = &s->selected_line;
4956 }
4957 
4958 static const struct got_error *
4959 search_next_view_match(struct tog_view *view)
4960 {
4961 	const struct got_error *err = NULL;
4962 	FILE *f;
4963 	int lineno;
4964 	char *line = NULL;
4965 	size_t linesize = 0;
4966 	ssize_t linelen;
4967 	off_t *line_offsets;
4968 	size_t nlines = 0;
4969 	int *first, *last, *match, *selected;
4970 
4971 	if (!view->search_setup)
4972 		return got_error_msg(GOT_ERR_NOT_IMPL,
4973 		    "view search not supported");
4974 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4975 	    &match, &selected);
4976 
4977 	if (!view->searching) {
4978 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4979 		return NULL;
4980 	}
4981 
4982 	if (*match) {
4983 		if (view->searching == TOG_SEARCH_FORWARD)
4984 			lineno = *match + 1;
4985 		else
4986 			lineno = *match - 1;
4987 	} else
4988 		lineno = *first - 1 + *selected;
4989 
4990 	while (1) {
4991 		off_t offset;
4992 
4993 		if (lineno <= 0 || lineno > nlines) {
4994 			if (*match == 0) {
4995 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4996 				break;
4997 			}
4998 
4999 			if (view->searching == TOG_SEARCH_FORWARD)
5000 				lineno = 1;
5001 			else
5002 				lineno = nlines;
5003 		}
5004 
5005 		offset = view->type == TOG_VIEW_DIFF ?
5006 		    view->state.diff.lines[lineno - 1].offset :
5007 		    line_offsets[lineno - 1];
5008 		if (fseeko(f, offset, SEEK_SET) != 0) {
5009 			free(line);
5010 			return got_error_from_errno("fseeko");
5011 		}
5012 		linelen = getline(&line, &linesize, f);
5013 		if (linelen != -1) {
5014 			char *exstr;
5015 			err = expand_tab(&exstr, line);
5016 			if (err)
5017 				break;
5018 			if (match_line(exstr, &view->regex, 1,
5019 			    &view->regmatch)) {
5020 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5021 				*match = lineno;
5022 				free(exstr);
5023 				break;
5024 			}
5025 			free(exstr);
5026 		}
5027 		if (view->searching == TOG_SEARCH_FORWARD)
5028 			lineno++;
5029 		else
5030 			lineno--;
5031 	}
5032 	free(line);
5033 
5034 	if (*match) {
5035 		*first = *match;
5036 		*selected = 1;
5037 	}
5038 
5039 	return err;
5040 }
5041 
5042 static const struct got_error *
5043 close_diff_view(struct tog_view *view)
5044 {
5045 	const struct got_error *err = NULL;
5046 	struct tog_diff_view_state *s = &view->state.diff;
5047 
5048 	free(s->id1);
5049 	s->id1 = NULL;
5050 	free(s->id2);
5051 	s->id2 = NULL;
5052 	if (s->f && fclose(s->f) == EOF)
5053 		err = got_error_from_errno("fclose");
5054 	s->f = NULL;
5055 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5056 		err = got_error_from_errno("fclose");
5057 	s->f1 = NULL;
5058 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5059 		err = got_error_from_errno("fclose");
5060 	s->f2 = NULL;
5061 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5062 		err = got_error_from_errno("close");
5063 	s->fd1 = -1;
5064 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5065 		err = got_error_from_errno("close");
5066 	s->fd2 = -1;
5067 	free(s->lines);
5068 	s->lines = NULL;
5069 	s->nlines = 0;
5070 	return err;
5071 }
5072 
5073 static const struct got_error *
5074 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5075     struct got_object_id *id2, const char *label1, const char *label2,
5076     int diff_context, int ignore_whitespace, int force_text_diff,
5077     struct tog_view *parent_view, struct got_repository *repo)
5078 {
5079 	const struct got_error *err;
5080 	struct tog_diff_view_state *s = &view->state.diff;
5081 
5082 	memset(s, 0, sizeof(*s));
5083 	s->fd1 = -1;
5084 	s->fd2 = -1;
5085 
5086 	if (id1 != NULL && id2 != NULL) {
5087 	    int type1, type2;
5088 	    err = got_object_get_type(&type1, repo, id1);
5089 	    if (err)
5090 		return err;
5091 	    err = got_object_get_type(&type2, repo, id2);
5092 	    if (err)
5093 		return err;
5094 
5095 	    if (type1 != type2)
5096 		return got_error(GOT_ERR_OBJ_TYPE);
5097 	}
5098 	s->first_displayed_line = 1;
5099 	s->last_displayed_line = view->nlines;
5100 	s->selected_line = 1;
5101 	s->repo = repo;
5102 	s->id1 = id1;
5103 	s->id2 = id2;
5104 	s->label1 = label1;
5105 	s->label2 = label2;
5106 
5107 	if (id1) {
5108 		s->id1 = got_object_id_dup(id1);
5109 		if (s->id1 == NULL)
5110 			return got_error_from_errno("got_object_id_dup");
5111 	} else
5112 		s->id1 = NULL;
5113 
5114 	s->id2 = got_object_id_dup(id2);
5115 	if (s->id2 == NULL) {
5116 		err = got_error_from_errno("got_object_id_dup");
5117 		goto done;
5118 	}
5119 
5120 	s->f1 = got_opentemp();
5121 	if (s->f1 == NULL) {
5122 		err = got_error_from_errno("got_opentemp");
5123 		goto done;
5124 	}
5125 
5126 	s->f2 = got_opentemp();
5127 	if (s->f2 == NULL) {
5128 		err = got_error_from_errno("got_opentemp");
5129 		goto done;
5130 	}
5131 
5132 	s->fd1 = got_opentempfd();
5133 	if (s->fd1 == -1) {
5134 		err = got_error_from_errno("got_opentempfd");
5135 		goto done;
5136 	}
5137 
5138 	s->fd2 = got_opentempfd();
5139 	if (s->fd2 == -1) {
5140 		err = got_error_from_errno("got_opentempfd");
5141 		goto done;
5142 	}
5143 
5144 	s->diff_context = diff_context;
5145 	s->ignore_whitespace = ignore_whitespace;
5146 	s->force_text_diff = force_text_diff;
5147 	s->parent_view = parent_view;
5148 	s->repo = repo;
5149 
5150 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5151 		int rc;
5152 
5153 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5154 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5155 		if (rc != ERR)
5156 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5157 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5158 		if (rc != ERR)
5159 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5160 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5161 		if (rc != ERR)
5162 			rc = init_pair(GOT_DIFF_LINE_META,
5163 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5164 		if (rc != ERR)
5165 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5166 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5167 		if (rc != ERR)
5168 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5169 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5170 		if (rc != ERR)
5171 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5172 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5173 		if (rc != ERR)
5174 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5175 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5176 		if (rc != ERR)
5177 			rc = init_pair(GOT_DIFF_LINE_DATE,
5178 			    get_color_value("TOG_COLOR_DATE"), -1);
5179 		if (rc == ERR) {
5180 			err = got_error(GOT_ERR_RANGE);
5181 			goto done;
5182 		}
5183 	}
5184 
5185 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5186 	    view_is_splitscreen(view))
5187 		show_log_view(parent_view); /* draw border */
5188 	diff_view_indicate_progress(view);
5189 
5190 	err = create_diff(s);
5191 
5192 	view->show = show_diff_view;
5193 	view->input = input_diff_view;
5194 	view->reset = reset_diff_view;
5195 	view->close = close_diff_view;
5196 	view->search_start = search_start_diff_view;
5197 	view->search_setup = search_setup_diff_view;
5198 	view->search_next = search_next_view_match;
5199 done:
5200 	if (err)
5201 		close_diff_view(view);
5202 	return err;
5203 }
5204 
5205 static const struct got_error *
5206 show_diff_view(struct tog_view *view)
5207 {
5208 	const struct got_error *err;
5209 	struct tog_diff_view_state *s = &view->state.diff;
5210 	char *id_str1 = NULL, *id_str2, *header;
5211 	const char *label1, *label2;
5212 
5213 	if (s->id1) {
5214 		err = got_object_id_str(&id_str1, s->id1);
5215 		if (err)
5216 			return err;
5217 		label1 = s->label1 ? s->label1 : id_str1;
5218 	} else
5219 		label1 = "/dev/null";
5220 
5221 	err = got_object_id_str(&id_str2, s->id2);
5222 	if (err)
5223 		return err;
5224 	label2 = s->label2 ? s->label2 : id_str2;
5225 
5226 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5227 		err = got_error_from_errno("asprintf");
5228 		free(id_str1);
5229 		free(id_str2);
5230 		return err;
5231 	}
5232 	free(id_str1);
5233 	free(id_str2);
5234 
5235 	err = draw_file(view, header);
5236 	free(header);
5237 	return err;
5238 }
5239 
5240 static const struct got_error *
5241 set_selected_commit(struct tog_diff_view_state *s,
5242     struct commit_queue_entry *entry)
5243 {
5244 	const struct got_error *err;
5245 	const struct got_object_id_queue *parent_ids;
5246 	struct got_commit_object *selected_commit;
5247 	struct got_object_qid *pid;
5248 
5249 	free(s->id2);
5250 	s->id2 = got_object_id_dup(entry->id);
5251 	if (s->id2 == NULL)
5252 		return got_error_from_errno("got_object_id_dup");
5253 
5254 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5255 	if (err)
5256 		return err;
5257 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5258 	free(s->id1);
5259 	pid = STAILQ_FIRST(parent_ids);
5260 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5261 	got_object_commit_close(selected_commit);
5262 	return NULL;
5263 }
5264 
5265 static const struct got_error *
5266 reset_diff_view(struct tog_view *view)
5267 {
5268 	struct tog_diff_view_state *s = &view->state.diff;
5269 
5270 	view->count = 0;
5271 	wclear(view->window);
5272 	s->first_displayed_line = 1;
5273 	s->last_displayed_line = view->nlines;
5274 	s->matched_line = 0;
5275 	diff_view_indicate_progress(view);
5276 	return create_diff(s);
5277 }
5278 
5279 static void
5280 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5281 {
5282 	int start, i;
5283 
5284 	i = start = s->first_displayed_line - 1;
5285 
5286 	while (s->lines[i].type != type) {
5287 		if (i == 0)
5288 			i = s->nlines - 1;
5289 		if (--i == start)
5290 			return; /* do nothing, requested type not in file */
5291 	}
5292 
5293 	s->selected_line = 1;
5294 	s->first_displayed_line = i;
5295 }
5296 
5297 static void
5298 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5299 {
5300 	int start, i;
5301 
5302 	i = start = s->first_displayed_line + 1;
5303 
5304 	while (s->lines[i].type != type) {
5305 		if (i == s->nlines - 1)
5306 			i = 0;
5307 		if (++i == start)
5308 			return; /* do nothing, requested type not in file */
5309 	}
5310 
5311 	s->selected_line = 1;
5312 	s->first_displayed_line = i;
5313 }
5314 
5315 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5316     int, int, int);
5317 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5318     int, int);
5319 
5320 static const struct got_error *
5321 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5322 {
5323 	const struct got_error *err = NULL;
5324 	struct tog_diff_view_state *s = &view->state.diff;
5325 	struct tog_log_view_state *ls;
5326 	struct commit_queue_entry *old_selected_entry;
5327 	char *line = NULL;
5328 	size_t linesize = 0;
5329 	ssize_t linelen;
5330 	int i, nscroll = view->nlines - 1, up = 0;
5331 
5332 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5333 
5334 	switch (ch) {
5335 	case '0':
5336 	case '$':
5337 	case KEY_RIGHT:
5338 	case 'l':
5339 	case KEY_LEFT:
5340 	case 'h':
5341 		horizontal_scroll_input(view, ch);
5342 		break;
5343 	case 'a':
5344 	case 'w':
5345 		if (ch == 'a') {
5346 			s->force_text_diff = !s->force_text_diff;
5347 			view->action = s->force_text_diff ?
5348 			    "force ASCII text enabled" :
5349 			    "force ASCII text disabled";
5350 		}
5351 		else if (ch == 'w') {
5352 			s->ignore_whitespace = !s->ignore_whitespace;
5353 			view->action = s->ignore_whitespace ?
5354 			    "ignore whitespace enabled" :
5355 			    "ignore whitespace disabled";
5356 		}
5357 		err = reset_diff_view(view);
5358 		break;
5359 	case 'g':
5360 	case KEY_HOME:
5361 		s->first_displayed_line = 1;
5362 		view->count = 0;
5363 		break;
5364 	case 'G':
5365 	case KEY_END:
5366 		view->count = 0;
5367 		if (s->eof)
5368 			break;
5369 
5370 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5371 		s->eof = 1;
5372 		break;
5373 	case 'k':
5374 	case KEY_UP:
5375 	case CTRL('p'):
5376 		if (s->first_displayed_line > 1)
5377 			s->first_displayed_line--;
5378 		else
5379 			view->count = 0;
5380 		break;
5381 	case CTRL('u'):
5382 	case 'u':
5383 		nscroll /= 2;
5384 		/* FALL THROUGH */
5385 	case KEY_PPAGE:
5386 	case CTRL('b'):
5387 	case 'b':
5388 		if (s->first_displayed_line == 1) {
5389 			view->count = 0;
5390 			break;
5391 		}
5392 		i = 0;
5393 		while (i++ < nscroll && s->first_displayed_line > 1)
5394 			s->first_displayed_line--;
5395 		break;
5396 	case 'j':
5397 	case KEY_DOWN:
5398 	case CTRL('n'):
5399 		if (!s->eof)
5400 			s->first_displayed_line++;
5401 		else
5402 			view->count = 0;
5403 		break;
5404 	case CTRL('d'):
5405 	case 'd':
5406 		nscroll /= 2;
5407 		/* FALL THROUGH */
5408 	case KEY_NPAGE:
5409 	case CTRL('f'):
5410 	case 'f':
5411 	case ' ':
5412 		if (s->eof) {
5413 			view->count = 0;
5414 			break;
5415 		}
5416 		i = 0;
5417 		while (!s->eof && i++ < nscroll) {
5418 			linelen = getline(&line, &linesize, s->f);
5419 			s->first_displayed_line++;
5420 			if (linelen == -1) {
5421 				if (feof(s->f)) {
5422 					s->eof = 1;
5423 				} else
5424 					err = got_ferror(s->f, GOT_ERR_IO);
5425 				break;
5426 			}
5427 		}
5428 		free(line);
5429 		break;
5430 	case '(':
5431 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5432 		break;
5433 	case ')':
5434 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5435 		break;
5436 	case '{':
5437 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5438 		break;
5439 	case '}':
5440 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5441 		break;
5442 	case '[':
5443 		if (s->diff_context > 0) {
5444 			s->diff_context--;
5445 			s->matched_line = 0;
5446 			diff_view_indicate_progress(view);
5447 			err = create_diff(s);
5448 			if (s->first_displayed_line + view->nlines - 1 >
5449 			    s->nlines) {
5450 				s->first_displayed_line = 1;
5451 				s->last_displayed_line = view->nlines;
5452 			}
5453 		} else
5454 			view->count = 0;
5455 		break;
5456 	case ']':
5457 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5458 			s->diff_context++;
5459 			s->matched_line = 0;
5460 			diff_view_indicate_progress(view);
5461 			err = create_diff(s);
5462 		} else
5463 			view->count = 0;
5464 		break;
5465 	case '<':
5466 	case ',':
5467 	case 'K':
5468 		up = 1;
5469 		/* FALL THROUGH */
5470 	case '>':
5471 	case '.':
5472 	case 'J':
5473 		if (s->parent_view == NULL) {
5474 			view->count = 0;
5475 			break;
5476 		}
5477 		s->parent_view->count = view->count;
5478 
5479 		if (s->parent_view->type == TOG_VIEW_LOG) {
5480 			ls = &s->parent_view->state.log;
5481 			old_selected_entry = ls->selected_entry;
5482 
5483 			err = input_log_view(NULL, s->parent_view,
5484 			    up ? KEY_UP : KEY_DOWN);
5485 			if (err)
5486 				break;
5487 			view->count = s->parent_view->count;
5488 
5489 			if (old_selected_entry == ls->selected_entry)
5490 				break;
5491 
5492 			err = set_selected_commit(s, ls->selected_entry);
5493 			if (err)
5494 				break;
5495 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5496 			struct tog_blame_view_state *bs;
5497 			struct got_object_id *id, *prev_id;
5498 
5499 			bs = &s->parent_view->state.blame;
5500 			prev_id = get_annotation_for_line(bs->blame.lines,
5501 			    bs->blame.nlines, bs->last_diffed_line);
5502 
5503 			err = input_blame_view(&view, s->parent_view,
5504 			    up ? KEY_UP : KEY_DOWN);
5505 			if (err)
5506 				break;
5507 			view->count = s->parent_view->count;
5508 
5509 			if (prev_id == NULL)
5510 				break;
5511 			id = get_selected_commit_id(bs->blame.lines,
5512 			    bs->blame.nlines, bs->first_displayed_line,
5513 			    bs->selected_line);
5514 			if (id == NULL)
5515 				break;
5516 
5517 			if (!got_object_id_cmp(prev_id, id))
5518 				break;
5519 
5520 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5521 			if (err)
5522 				break;
5523 		}
5524 		s->first_displayed_line = 1;
5525 		s->last_displayed_line = view->nlines;
5526 		s->matched_line = 0;
5527 		view->x = 0;
5528 
5529 		diff_view_indicate_progress(view);
5530 		err = create_diff(s);
5531 		break;
5532 	default:
5533 		view->count = 0;
5534 		break;
5535 	}
5536 
5537 	return err;
5538 }
5539 
5540 static const struct got_error *
5541 cmd_diff(int argc, char *argv[])
5542 {
5543 	const struct got_error *error = NULL;
5544 	struct got_repository *repo = NULL;
5545 	struct got_worktree *worktree = NULL;
5546 	struct got_object_id *id1 = NULL, *id2 = NULL;
5547 	char *repo_path = NULL, *cwd = NULL;
5548 	char *id_str1 = NULL, *id_str2 = NULL;
5549 	char *label1 = NULL, *label2 = NULL;
5550 	int diff_context = 3, ignore_whitespace = 0;
5551 	int ch, force_text_diff = 0;
5552 	const char *errstr;
5553 	struct tog_view *view;
5554 	int *pack_fds = NULL;
5555 
5556 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5557 		switch (ch) {
5558 		case 'a':
5559 			force_text_diff = 1;
5560 			break;
5561 		case 'C':
5562 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5563 			    &errstr);
5564 			if (errstr != NULL)
5565 				errx(1, "number of context lines is %s: %s",
5566 				    errstr, errstr);
5567 			break;
5568 		case 'r':
5569 			repo_path = realpath(optarg, NULL);
5570 			if (repo_path == NULL)
5571 				return got_error_from_errno2("realpath",
5572 				    optarg);
5573 			got_path_strip_trailing_slashes(repo_path);
5574 			break;
5575 		case 'w':
5576 			ignore_whitespace = 1;
5577 			break;
5578 		default:
5579 			usage_diff();
5580 			/* NOTREACHED */
5581 		}
5582 	}
5583 
5584 	argc -= optind;
5585 	argv += optind;
5586 
5587 	if (argc == 0) {
5588 		usage_diff(); /* TODO show local worktree changes */
5589 	} else if (argc == 2) {
5590 		id_str1 = argv[0];
5591 		id_str2 = argv[1];
5592 	} else
5593 		usage_diff();
5594 
5595 	error = got_repo_pack_fds_open(&pack_fds);
5596 	if (error)
5597 		goto done;
5598 
5599 	if (repo_path == NULL) {
5600 		cwd = getcwd(NULL, 0);
5601 		if (cwd == NULL)
5602 			return got_error_from_errno("getcwd");
5603 		error = got_worktree_open(&worktree, cwd);
5604 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5605 			goto done;
5606 		if (worktree)
5607 			repo_path =
5608 			    strdup(got_worktree_get_repo_path(worktree));
5609 		else
5610 			repo_path = strdup(cwd);
5611 		if (repo_path == NULL) {
5612 			error = got_error_from_errno("strdup");
5613 			goto done;
5614 		}
5615 	}
5616 
5617 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5618 	if (error)
5619 		goto done;
5620 
5621 	init_curses();
5622 
5623 	error = apply_unveil(got_repo_get_path(repo), NULL);
5624 	if (error)
5625 		goto done;
5626 
5627 	error = tog_load_refs(repo, 0);
5628 	if (error)
5629 		goto done;
5630 
5631 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5632 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5633 	if (error)
5634 		goto done;
5635 
5636 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5637 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5638 	if (error)
5639 		goto done;
5640 
5641 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5642 	if (view == NULL) {
5643 		error = got_error_from_errno("view_open");
5644 		goto done;
5645 	}
5646 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5647 	    ignore_whitespace, force_text_diff, NULL,  repo);
5648 	if (error)
5649 		goto done;
5650 	error = view_loop(view);
5651 done:
5652 	free(label1);
5653 	free(label2);
5654 	free(repo_path);
5655 	free(cwd);
5656 	if (repo) {
5657 		const struct got_error *close_err = got_repo_close(repo);
5658 		if (error == NULL)
5659 			error = close_err;
5660 	}
5661 	if (worktree)
5662 		got_worktree_close(worktree);
5663 	if (pack_fds) {
5664 		const struct got_error *pack_err =
5665 		    got_repo_pack_fds_close(pack_fds);
5666 		if (error == NULL)
5667 			error = pack_err;
5668 	}
5669 	tog_free_refs();
5670 	return error;
5671 }
5672 
5673 __dead static void
5674 usage_blame(void)
5675 {
5676 	endwin();
5677 	fprintf(stderr,
5678 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5679 	    getprogname());
5680 	exit(1);
5681 }
5682 
5683 struct tog_blame_line {
5684 	int annotated;
5685 	struct got_object_id *id;
5686 };
5687 
5688 static const struct got_error *
5689 draw_blame(struct tog_view *view)
5690 {
5691 	struct tog_blame_view_state *s = &view->state.blame;
5692 	struct tog_blame *blame = &s->blame;
5693 	regmatch_t *regmatch = &view->regmatch;
5694 	const struct got_error *err;
5695 	int lineno = 0, nprinted = 0;
5696 	char *line = NULL;
5697 	size_t linesize = 0;
5698 	ssize_t linelen;
5699 	wchar_t *wline;
5700 	int width;
5701 	struct tog_blame_line *blame_line;
5702 	struct got_object_id *prev_id = NULL;
5703 	char *id_str;
5704 	struct tog_color *tc;
5705 
5706 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5707 	if (err)
5708 		return err;
5709 
5710 	rewind(blame->f);
5711 	werase(view->window);
5712 
5713 	if (asprintf(&line, "commit %s", id_str) == -1) {
5714 		err = got_error_from_errno("asprintf");
5715 		free(id_str);
5716 		return err;
5717 	}
5718 
5719 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5720 	free(line);
5721 	line = NULL;
5722 	if (err)
5723 		return err;
5724 	if (view_needs_focus_indication(view))
5725 		wstandout(view->window);
5726 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5727 	if (tc)
5728 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5729 	waddwstr(view->window, wline);
5730 	while (width++ < view->ncols)
5731 		waddch(view->window, ' ');
5732 	if (tc)
5733 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5734 	if (view_needs_focus_indication(view))
5735 		wstandend(view->window);
5736 	free(wline);
5737 	wline = NULL;
5738 
5739 	if (view->gline > blame->nlines)
5740 		view->gline = blame->nlines;
5741 
5742 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5743 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5744 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5745 		free(id_str);
5746 		return got_error_from_errno("asprintf");
5747 	}
5748 	free(id_str);
5749 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5750 	free(line);
5751 	line = NULL;
5752 	if (err)
5753 		return err;
5754 	waddwstr(view->window, wline);
5755 	free(wline);
5756 	wline = NULL;
5757 	if (width < view->ncols - 1)
5758 		waddch(view->window, '\n');
5759 
5760 	s->eof = 0;
5761 	view->maxx = 0;
5762 	while (nprinted < view->nlines - 2) {
5763 		linelen = getline(&line, &linesize, blame->f);
5764 		if (linelen == -1) {
5765 			if (feof(blame->f)) {
5766 				s->eof = 1;
5767 				break;
5768 			}
5769 			free(line);
5770 			return got_ferror(blame->f, GOT_ERR_IO);
5771 		}
5772 		if (++lineno < s->first_displayed_line)
5773 			continue;
5774 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5775 			continue;
5776 
5777 		/* Set view->maxx based on full line length. */
5778 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5779 		if (err) {
5780 			free(line);
5781 			return err;
5782 		}
5783 		free(wline);
5784 		wline = NULL;
5785 		view->maxx = MAX(view->maxx, width);
5786 
5787 		if (nprinted == s->selected_line - 1)
5788 			wstandout(view->window);
5789 
5790 		if (blame->nlines > 0) {
5791 			blame_line = &blame->lines[lineno - 1];
5792 			if (blame_line->annotated && prev_id &&
5793 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5794 			    !(nprinted == s->selected_line - 1)) {
5795 				waddstr(view->window, "        ");
5796 			} else if (blame_line->annotated) {
5797 				char *id_str;
5798 				err = got_object_id_str(&id_str,
5799 				    blame_line->id);
5800 				if (err) {
5801 					free(line);
5802 					return err;
5803 				}
5804 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5805 				if (tc)
5806 					wattr_on(view->window,
5807 					    COLOR_PAIR(tc->colorpair), NULL);
5808 				wprintw(view->window, "%.8s", id_str);
5809 				if (tc)
5810 					wattr_off(view->window,
5811 					    COLOR_PAIR(tc->colorpair), NULL);
5812 				free(id_str);
5813 				prev_id = blame_line->id;
5814 			} else {
5815 				waddstr(view->window, "........");
5816 				prev_id = NULL;
5817 			}
5818 		} else {
5819 			waddstr(view->window, "........");
5820 			prev_id = NULL;
5821 		}
5822 
5823 		if (nprinted == s->selected_line - 1)
5824 			wstandend(view->window);
5825 		waddstr(view->window, " ");
5826 
5827 		if (view->ncols <= 9) {
5828 			width = 9;
5829 		} else if (s->first_displayed_line + nprinted ==
5830 		    s->matched_line &&
5831 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5832 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5833 			    view->window, view->x, regmatch);
5834 			if (err) {
5835 				free(line);
5836 				return err;
5837 			}
5838 			width += 9;
5839 		} else {
5840 			int skip;
5841 			err = format_line(&wline, &width, &skip, line,
5842 			    view->x, view->ncols - 9, 9, 1);
5843 			if (err) {
5844 				free(line);
5845 				return err;
5846 			}
5847 			waddwstr(view->window, &wline[skip]);
5848 			width += 9;
5849 			free(wline);
5850 			wline = NULL;
5851 		}
5852 
5853 		if (width <= view->ncols - 1)
5854 			waddch(view->window, '\n');
5855 		if (++nprinted == 1)
5856 			s->first_displayed_line = lineno;
5857 	}
5858 	free(line);
5859 	s->last_displayed_line = lineno;
5860 
5861 	view_border(view);
5862 
5863 	return NULL;
5864 }
5865 
5866 static const struct got_error *
5867 blame_cb(void *arg, int nlines, int lineno,
5868     struct got_commit_object *commit, struct got_object_id *id)
5869 {
5870 	const struct got_error *err = NULL;
5871 	struct tog_blame_cb_args *a = arg;
5872 	struct tog_blame_line *line;
5873 	int errcode;
5874 
5875 	if (nlines != a->nlines ||
5876 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5877 		return got_error(GOT_ERR_RANGE);
5878 
5879 	errcode = pthread_mutex_lock(&tog_mutex);
5880 	if (errcode)
5881 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5882 
5883 	if (*a->quit) {	/* user has quit the blame view */
5884 		err = got_error(GOT_ERR_ITER_COMPLETED);
5885 		goto done;
5886 	}
5887 
5888 	if (lineno == -1)
5889 		goto done; /* no change in this commit */
5890 
5891 	line = &a->lines[lineno - 1];
5892 	if (line->annotated)
5893 		goto done;
5894 
5895 	line->id = got_object_id_dup(id);
5896 	if (line->id == NULL) {
5897 		err = got_error_from_errno("got_object_id_dup");
5898 		goto done;
5899 	}
5900 	line->annotated = 1;
5901 done:
5902 	errcode = pthread_mutex_unlock(&tog_mutex);
5903 	if (errcode)
5904 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5905 	return err;
5906 }
5907 
5908 static void *
5909 blame_thread(void *arg)
5910 {
5911 	const struct got_error *err, *close_err;
5912 	struct tog_blame_thread_args *ta = arg;
5913 	struct tog_blame_cb_args *a = ta->cb_args;
5914 	int errcode, fd1 = -1, fd2 = -1;
5915 	FILE *f1 = NULL, *f2 = NULL;
5916 
5917 	fd1 = got_opentempfd();
5918 	if (fd1 == -1)
5919 		return (void *)got_error_from_errno("got_opentempfd");
5920 
5921 	fd2 = got_opentempfd();
5922 	if (fd2 == -1) {
5923 		err = got_error_from_errno("got_opentempfd");
5924 		goto done;
5925 	}
5926 
5927 	f1 = got_opentemp();
5928 	if (f1 == NULL) {
5929 		err = (void *)got_error_from_errno("got_opentemp");
5930 		goto done;
5931 	}
5932 	f2 = got_opentemp();
5933 	if (f2 == NULL) {
5934 		err = (void *)got_error_from_errno("got_opentemp");
5935 		goto done;
5936 	}
5937 
5938 	err = block_signals_used_by_main_thread();
5939 	if (err)
5940 		goto done;
5941 
5942 	err = got_blame(ta->path, a->commit_id, ta->repo,
5943 	    tog_diff_algo, blame_cb, ta->cb_args,
5944 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5945 	if (err && err->code == GOT_ERR_CANCELLED)
5946 		err = NULL;
5947 
5948 	errcode = pthread_mutex_lock(&tog_mutex);
5949 	if (errcode) {
5950 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5951 		goto done;
5952 	}
5953 
5954 	close_err = got_repo_close(ta->repo);
5955 	if (err == NULL)
5956 		err = close_err;
5957 	ta->repo = NULL;
5958 	*ta->complete = 1;
5959 
5960 	errcode = pthread_mutex_unlock(&tog_mutex);
5961 	if (errcode && err == NULL)
5962 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5963 
5964 done:
5965 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5966 		err = got_error_from_errno("close");
5967 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5968 		err = got_error_from_errno("close");
5969 	if (f1 && fclose(f1) == EOF && err == NULL)
5970 		err = got_error_from_errno("fclose");
5971 	if (f2 && fclose(f2) == EOF && err == NULL)
5972 		err = got_error_from_errno("fclose");
5973 
5974 	return (void *)err;
5975 }
5976 
5977 static struct got_object_id *
5978 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5979     int first_displayed_line, int selected_line)
5980 {
5981 	struct tog_blame_line *line;
5982 
5983 	if (nlines <= 0)
5984 		return NULL;
5985 
5986 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5987 	if (!line->annotated)
5988 		return NULL;
5989 
5990 	return line->id;
5991 }
5992 
5993 static struct got_object_id *
5994 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5995     int lineno)
5996 {
5997 	struct tog_blame_line *line;
5998 
5999 	if (nlines <= 0 || lineno >= nlines)
6000 		return NULL;
6001 
6002 	line = &lines[lineno - 1];
6003 	if (!line->annotated)
6004 		return NULL;
6005 
6006 	return line->id;
6007 }
6008 
6009 static const struct got_error *
6010 stop_blame(struct tog_blame *blame)
6011 {
6012 	const struct got_error *err = NULL;
6013 	int i;
6014 
6015 	if (blame->thread) {
6016 		int errcode;
6017 		errcode = pthread_mutex_unlock(&tog_mutex);
6018 		if (errcode)
6019 			return got_error_set_errno(errcode,
6020 			    "pthread_mutex_unlock");
6021 		errcode = pthread_join(blame->thread, (void **)&err);
6022 		if (errcode)
6023 			return got_error_set_errno(errcode, "pthread_join");
6024 		errcode = pthread_mutex_lock(&tog_mutex);
6025 		if (errcode)
6026 			return got_error_set_errno(errcode,
6027 			    "pthread_mutex_lock");
6028 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6029 			err = NULL;
6030 		blame->thread = 0; //NULL;
6031 	}
6032 	if (blame->thread_args.repo) {
6033 		const struct got_error *close_err;
6034 		close_err = got_repo_close(blame->thread_args.repo);
6035 		if (err == NULL)
6036 			err = close_err;
6037 		blame->thread_args.repo = NULL;
6038 	}
6039 	if (blame->f) {
6040 		if (fclose(blame->f) == EOF && err == NULL)
6041 			err = got_error_from_errno("fclose");
6042 		blame->f = NULL;
6043 	}
6044 	if (blame->lines) {
6045 		for (i = 0; i < blame->nlines; i++)
6046 			free(blame->lines[i].id);
6047 		free(blame->lines);
6048 		blame->lines = NULL;
6049 	}
6050 	free(blame->cb_args.commit_id);
6051 	blame->cb_args.commit_id = NULL;
6052 	if (blame->pack_fds) {
6053 		const struct got_error *pack_err =
6054 		    got_repo_pack_fds_close(blame->pack_fds);
6055 		if (err == NULL)
6056 			err = pack_err;
6057 		blame->pack_fds = NULL;
6058 	}
6059 	return err;
6060 }
6061 
6062 static const struct got_error *
6063 cancel_blame_view(void *arg)
6064 {
6065 	const struct got_error *err = NULL;
6066 	int *done = arg;
6067 	int errcode;
6068 
6069 	errcode = pthread_mutex_lock(&tog_mutex);
6070 	if (errcode)
6071 		return got_error_set_errno(errcode,
6072 		    "pthread_mutex_unlock");
6073 
6074 	if (*done)
6075 		err = got_error(GOT_ERR_CANCELLED);
6076 
6077 	errcode = pthread_mutex_unlock(&tog_mutex);
6078 	if (errcode)
6079 		return got_error_set_errno(errcode,
6080 		    "pthread_mutex_lock");
6081 
6082 	return err;
6083 }
6084 
6085 static const struct got_error *
6086 run_blame(struct tog_view *view)
6087 {
6088 	struct tog_blame_view_state *s = &view->state.blame;
6089 	struct tog_blame *blame = &s->blame;
6090 	const struct got_error *err = NULL;
6091 	struct got_commit_object *commit = NULL;
6092 	struct got_blob_object *blob = NULL;
6093 	struct got_repository *thread_repo = NULL;
6094 	struct got_object_id *obj_id = NULL;
6095 	int obj_type, fd = -1;
6096 	int *pack_fds = NULL;
6097 
6098 	err = got_object_open_as_commit(&commit, s->repo,
6099 	    &s->blamed_commit->id);
6100 	if (err)
6101 		return err;
6102 
6103 	fd = got_opentempfd();
6104 	if (fd == -1) {
6105 		err = got_error_from_errno("got_opentempfd");
6106 		goto done;
6107 	}
6108 
6109 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6110 	if (err)
6111 		goto done;
6112 
6113 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6114 	if (err)
6115 		goto done;
6116 
6117 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6118 		err = got_error(GOT_ERR_OBJ_TYPE);
6119 		goto done;
6120 	}
6121 
6122 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6123 	if (err)
6124 		goto done;
6125 	blame->f = got_opentemp();
6126 	if (blame->f == NULL) {
6127 		err = got_error_from_errno("got_opentemp");
6128 		goto done;
6129 	}
6130 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6131 	    &blame->line_offsets, blame->f, blob);
6132 	if (err)
6133 		goto done;
6134 	if (blame->nlines == 0) {
6135 		s->blame_complete = 1;
6136 		goto done;
6137 	}
6138 
6139 	/* Don't include \n at EOF in the blame line count. */
6140 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6141 		blame->nlines--;
6142 
6143 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6144 	if (blame->lines == NULL) {
6145 		err = got_error_from_errno("calloc");
6146 		goto done;
6147 	}
6148 
6149 	err = got_repo_pack_fds_open(&pack_fds);
6150 	if (err)
6151 		goto done;
6152 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6153 	    pack_fds);
6154 	if (err)
6155 		goto done;
6156 
6157 	blame->pack_fds = pack_fds;
6158 	blame->cb_args.view = view;
6159 	blame->cb_args.lines = blame->lines;
6160 	blame->cb_args.nlines = blame->nlines;
6161 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6162 	if (blame->cb_args.commit_id == NULL) {
6163 		err = got_error_from_errno("got_object_id_dup");
6164 		goto done;
6165 	}
6166 	blame->cb_args.quit = &s->done;
6167 
6168 	blame->thread_args.path = s->path;
6169 	blame->thread_args.repo = thread_repo;
6170 	blame->thread_args.cb_args = &blame->cb_args;
6171 	blame->thread_args.complete = &s->blame_complete;
6172 	blame->thread_args.cancel_cb = cancel_blame_view;
6173 	blame->thread_args.cancel_arg = &s->done;
6174 	s->blame_complete = 0;
6175 
6176 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6177 		s->first_displayed_line = 1;
6178 		s->last_displayed_line = view->nlines;
6179 		s->selected_line = 1;
6180 	}
6181 	s->matched_line = 0;
6182 
6183 done:
6184 	if (commit)
6185 		got_object_commit_close(commit);
6186 	if (fd != -1 && close(fd) == -1 && err == NULL)
6187 		err = got_error_from_errno("close");
6188 	if (blob)
6189 		got_object_blob_close(blob);
6190 	free(obj_id);
6191 	if (err)
6192 		stop_blame(blame);
6193 	return err;
6194 }
6195 
6196 static const struct got_error *
6197 open_blame_view(struct tog_view *view, char *path,
6198     struct got_object_id *commit_id, struct got_repository *repo)
6199 {
6200 	const struct got_error *err = NULL;
6201 	struct tog_blame_view_state *s = &view->state.blame;
6202 
6203 	STAILQ_INIT(&s->blamed_commits);
6204 
6205 	s->path = strdup(path);
6206 	if (s->path == NULL)
6207 		return got_error_from_errno("strdup");
6208 
6209 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6210 	if (err) {
6211 		free(s->path);
6212 		return err;
6213 	}
6214 
6215 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6216 	s->first_displayed_line = 1;
6217 	s->last_displayed_line = view->nlines;
6218 	s->selected_line = 1;
6219 	s->blame_complete = 0;
6220 	s->repo = repo;
6221 	s->commit_id = commit_id;
6222 	memset(&s->blame, 0, sizeof(s->blame));
6223 
6224 	STAILQ_INIT(&s->colors);
6225 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6226 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6227 		    get_color_value("TOG_COLOR_COMMIT"));
6228 		if (err)
6229 			return err;
6230 	}
6231 
6232 	view->show = show_blame_view;
6233 	view->input = input_blame_view;
6234 	view->reset = reset_blame_view;
6235 	view->close = close_blame_view;
6236 	view->search_start = search_start_blame_view;
6237 	view->search_setup = search_setup_blame_view;
6238 	view->search_next = search_next_view_match;
6239 
6240 	return run_blame(view);
6241 }
6242 
6243 static const struct got_error *
6244 close_blame_view(struct tog_view *view)
6245 {
6246 	const struct got_error *err = NULL;
6247 	struct tog_blame_view_state *s = &view->state.blame;
6248 
6249 	if (s->blame.thread)
6250 		err = stop_blame(&s->blame);
6251 
6252 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6253 		struct got_object_qid *blamed_commit;
6254 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6255 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6256 		got_object_qid_free(blamed_commit);
6257 	}
6258 
6259 	free(s->path);
6260 	free_colors(&s->colors);
6261 	return err;
6262 }
6263 
6264 static const struct got_error *
6265 search_start_blame_view(struct tog_view *view)
6266 {
6267 	struct tog_blame_view_state *s = &view->state.blame;
6268 
6269 	s->matched_line = 0;
6270 	return NULL;
6271 }
6272 
6273 static void
6274 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6275     size_t *nlines, int **first, int **last, int **match, int **selected)
6276 {
6277 	struct tog_blame_view_state *s = &view->state.blame;
6278 
6279 	*f = s->blame.f;
6280 	*nlines = s->blame.nlines;
6281 	*line_offsets = s->blame.line_offsets;
6282 	*match = &s->matched_line;
6283 	*first = &s->first_displayed_line;
6284 	*last = &s->last_displayed_line;
6285 	*selected = &s->selected_line;
6286 }
6287 
6288 static const struct got_error *
6289 show_blame_view(struct tog_view *view)
6290 {
6291 	const struct got_error *err = NULL;
6292 	struct tog_blame_view_state *s = &view->state.blame;
6293 	int errcode;
6294 
6295 	if (s->blame.thread == 0 && !s->blame_complete) {
6296 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6297 		    &s->blame.thread_args);
6298 		if (errcode)
6299 			return got_error_set_errno(errcode, "pthread_create");
6300 
6301 		halfdelay(1); /* fast refresh while annotating  */
6302 	}
6303 
6304 	if (s->blame_complete)
6305 		halfdelay(10); /* disable fast refresh */
6306 
6307 	err = draw_blame(view);
6308 
6309 	view_border(view);
6310 	return err;
6311 }
6312 
6313 static const struct got_error *
6314 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6315     struct got_repository *repo, struct got_object_id *id)
6316 {
6317 	struct tog_view		*log_view;
6318 	const struct got_error	*err = NULL;
6319 
6320 	*new_view = NULL;
6321 
6322 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6323 	if (log_view == NULL)
6324 		return got_error_from_errno("view_open");
6325 
6326 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6327 	if (err)
6328 		view_close(log_view);
6329 	else
6330 		*new_view = log_view;
6331 
6332 	return err;
6333 }
6334 
6335 static const struct got_error *
6336 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6337 {
6338 	const struct got_error *err = NULL, *thread_err = NULL;
6339 	struct tog_view *diff_view;
6340 	struct tog_blame_view_state *s = &view->state.blame;
6341 	int eos, nscroll, begin_y = 0, begin_x = 0;
6342 
6343 	eos = nscroll = view->nlines - 2;
6344 	if (view_is_hsplit_top(view))
6345 		--eos;  /* border */
6346 
6347 	switch (ch) {
6348 	case '0':
6349 	case '$':
6350 	case KEY_RIGHT:
6351 	case 'l':
6352 	case KEY_LEFT:
6353 	case 'h':
6354 		horizontal_scroll_input(view, ch);
6355 		break;
6356 	case 'q':
6357 		s->done = 1;
6358 		break;
6359 	case 'g':
6360 	case KEY_HOME:
6361 		s->selected_line = 1;
6362 		s->first_displayed_line = 1;
6363 		view->count = 0;
6364 		break;
6365 	case 'G':
6366 	case KEY_END:
6367 		if (s->blame.nlines < eos) {
6368 			s->selected_line = s->blame.nlines;
6369 			s->first_displayed_line = 1;
6370 		} else {
6371 			s->selected_line = eos;
6372 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6373 		}
6374 		view->count = 0;
6375 		break;
6376 	case 'k':
6377 	case KEY_UP:
6378 	case CTRL('p'):
6379 		if (s->selected_line > 1)
6380 			s->selected_line--;
6381 		else if (s->selected_line == 1 &&
6382 		    s->first_displayed_line > 1)
6383 			s->first_displayed_line--;
6384 		else
6385 			view->count = 0;
6386 		break;
6387 	case CTRL('u'):
6388 	case 'u':
6389 		nscroll /= 2;
6390 		/* FALL THROUGH */
6391 	case KEY_PPAGE:
6392 	case CTRL('b'):
6393 	case 'b':
6394 		if (s->first_displayed_line == 1) {
6395 			if (view->count > 1)
6396 				nscroll += nscroll;
6397 			s->selected_line = MAX(1, s->selected_line - nscroll);
6398 			view->count = 0;
6399 			break;
6400 		}
6401 		if (s->first_displayed_line > nscroll)
6402 			s->first_displayed_line -= nscroll;
6403 		else
6404 			s->first_displayed_line = 1;
6405 		break;
6406 	case 'j':
6407 	case KEY_DOWN:
6408 	case CTRL('n'):
6409 		if (s->selected_line < eos && s->first_displayed_line +
6410 		    s->selected_line <= s->blame.nlines)
6411 			s->selected_line++;
6412 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6413 			s->first_displayed_line++;
6414 		else
6415 			view->count = 0;
6416 		break;
6417 	case 'c':
6418 	case 'p': {
6419 		struct got_object_id *id = NULL;
6420 
6421 		view->count = 0;
6422 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6423 		    s->first_displayed_line, s->selected_line);
6424 		if (id == NULL)
6425 			break;
6426 		if (ch == 'p') {
6427 			struct got_commit_object *commit, *pcommit;
6428 			struct got_object_qid *pid;
6429 			struct got_object_id *blob_id = NULL;
6430 			int obj_type;
6431 			err = got_object_open_as_commit(&commit,
6432 			    s->repo, id);
6433 			if (err)
6434 				break;
6435 			pid = STAILQ_FIRST(
6436 			    got_object_commit_get_parent_ids(commit));
6437 			if (pid == NULL) {
6438 				got_object_commit_close(commit);
6439 				break;
6440 			}
6441 			/* Check if path history ends here. */
6442 			err = got_object_open_as_commit(&pcommit,
6443 			    s->repo, &pid->id);
6444 			if (err)
6445 				break;
6446 			err = got_object_id_by_path(&blob_id, s->repo,
6447 			    pcommit, s->path);
6448 			got_object_commit_close(pcommit);
6449 			if (err) {
6450 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6451 					err = NULL;
6452 				got_object_commit_close(commit);
6453 				break;
6454 			}
6455 			err = got_object_get_type(&obj_type, s->repo,
6456 			    blob_id);
6457 			free(blob_id);
6458 			/* Can't blame non-blob type objects. */
6459 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6460 				got_object_commit_close(commit);
6461 				break;
6462 			}
6463 			err = got_object_qid_alloc(&s->blamed_commit,
6464 			    &pid->id);
6465 			got_object_commit_close(commit);
6466 		} else {
6467 			if (got_object_id_cmp(id,
6468 			    &s->blamed_commit->id) == 0)
6469 				break;
6470 			err = got_object_qid_alloc(&s->blamed_commit,
6471 			    id);
6472 		}
6473 		if (err)
6474 			break;
6475 		s->done = 1;
6476 		thread_err = stop_blame(&s->blame);
6477 		s->done = 0;
6478 		if (thread_err)
6479 			break;
6480 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6481 		    s->blamed_commit, entry);
6482 		err = run_blame(view);
6483 		if (err)
6484 			break;
6485 		break;
6486 	}
6487 	case 'C': {
6488 		struct got_object_qid *first;
6489 
6490 		view->count = 0;
6491 		first = STAILQ_FIRST(&s->blamed_commits);
6492 		if (!got_object_id_cmp(&first->id, s->commit_id))
6493 			break;
6494 		s->done = 1;
6495 		thread_err = stop_blame(&s->blame);
6496 		s->done = 0;
6497 		if (thread_err)
6498 			break;
6499 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6500 		got_object_qid_free(s->blamed_commit);
6501 		s->blamed_commit =
6502 		    STAILQ_FIRST(&s->blamed_commits);
6503 		err = run_blame(view);
6504 		if (err)
6505 			break;
6506 		break;
6507 	}
6508 	case 'L':
6509 		view->count = 0;
6510 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6511 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6512 		if (s->id_to_log)
6513 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6514 		break;
6515 	case KEY_ENTER:
6516 	case '\r': {
6517 		struct got_object_id *id = NULL;
6518 		struct got_object_qid *pid;
6519 		struct got_commit_object *commit = NULL;
6520 
6521 		view->count = 0;
6522 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6523 		    s->first_displayed_line, s->selected_line);
6524 		if (id == NULL)
6525 			break;
6526 		err = got_object_open_as_commit(&commit, s->repo, id);
6527 		if (err)
6528 			break;
6529 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6530 		if (*new_view) {
6531 			/* traversed from diff view, release diff resources  */
6532 			err = close_diff_view(*new_view);
6533 			if (err)
6534 				break;
6535 			diff_view = *new_view;
6536 		} else {
6537 			if (view_is_parent_view(view))
6538 				view_get_split(view, &begin_y, &begin_x);
6539 
6540 			diff_view = view_open(0, 0, begin_y, begin_x,
6541 			    TOG_VIEW_DIFF);
6542 			if (diff_view == NULL) {
6543 				got_object_commit_close(commit);
6544 				err = got_error_from_errno("view_open");
6545 				break;
6546 			}
6547 		}
6548 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6549 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6550 		got_object_commit_close(commit);
6551 		if (err) {
6552 			view_close(diff_view);
6553 			break;
6554 		}
6555 		s->last_diffed_line = s->first_displayed_line - 1 +
6556 		    s->selected_line;
6557 		if (*new_view)
6558 			break;	/* still open from active diff view */
6559 		if (view_is_parent_view(view) &&
6560 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6561 			err = view_init_hsplit(view, begin_y);
6562 			if (err)
6563 				break;
6564 		}
6565 
6566 		view->focussed = 0;
6567 		diff_view->focussed = 1;
6568 		diff_view->mode = view->mode;
6569 		diff_view->nlines = view->lines - begin_y;
6570 		if (view_is_parent_view(view)) {
6571 			view_transfer_size(diff_view, view);
6572 			err = view_close_child(view);
6573 			if (err)
6574 				break;
6575 			err = view_set_child(view, diff_view);
6576 			if (err)
6577 				break;
6578 			view->focus_child = 1;
6579 		} else
6580 			*new_view = diff_view;
6581 		if (err)
6582 			break;
6583 		break;
6584 	}
6585 	case CTRL('d'):
6586 	case 'd':
6587 		nscroll /= 2;
6588 		/* FALL THROUGH */
6589 	case KEY_NPAGE:
6590 	case CTRL('f'):
6591 	case 'f':
6592 	case ' ':
6593 		if (s->last_displayed_line >= s->blame.nlines &&
6594 		    s->selected_line >= MIN(s->blame.nlines,
6595 		    view->nlines - 2)) {
6596 			view->count = 0;
6597 			break;
6598 		}
6599 		if (s->last_displayed_line >= s->blame.nlines &&
6600 		    s->selected_line < view->nlines - 2) {
6601 			s->selected_line +=
6602 			    MIN(nscroll, s->last_displayed_line -
6603 			    s->first_displayed_line - s->selected_line + 1);
6604 		}
6605 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6606 			s->first_displayed_line += nscroll;
6607 		else
6608 			s->first_displayed_line =
6609 			    s->blame.nlines - (view->nlines - 3);
6610 		break;
6611 	case KEY_RESIZE:
6612 		if (s->selected_line > view->nlines - 2) {
6613 			s->selected_line = MIN(s->blame.nlines,
6614 			    view->nlines - 2);
6615 		}
6616 		break;
6617 	default:
6618 		view->count = 0;
6619 		break;
6620 	}
6621 	return thread_err ? thread_err : err;
6622 }
6623 
6624 static const struct got_error *
6625 reset_blame_view(struct tog_view *view)
6626 {
6627 	const struct got_error *err;
6628 	struct tog_blame_view_state *s = &view->state.blame;
6629 
6630 	view->count = 0;
6631 	s->done = 1;
6632 	err = stop_blame(&s->blame);
6633 	s->done = 0;
6634 	if (err)
6635 		return err;
6636 	return run_blame(view);
6637 }
6638 
6639 static const struct got_error *
6640 cmd_blame(int argc, char *argv[])
6641 {
6642 	const struct got_error *error;
6643 	struct got_repository *repo = NULL;
6644 	struct got_worktree *worktree = NULL;
6645 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6646 	char *link_target = NULL;
6647 	struct got_object_id *commit_id = NULL;
6648 	struct got_commit_object *commit = NULL;
6649 	char *commit_id_str = NULL;
6650 	int ch;
6651 	struct tog_view *view;
6652 	int *pack_fds = NULL;
6653 
6654 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6655 		switch (ch) {
6656 		case 'c':
6657 			commit_id_str = optarg;
6658 			break;
6659 		case 'r':
6660 			repo_path = realpath(optarg, NULL);
6661 			if (repo_path == NULL)
6662 				return got_error_from_errno2("realpath",
6663 				    optarg);
6664 			break;
6665 		default:
6666 			usage_blame();
6667 			/* NOTREACHED */
6668 		}
6669 	}
6670 
6671 	argc -= optind;
6672 	argv += optind;
6673 
6674 	if (argc != 1)
6675 		usage_blame();
6676 
6677 	error = got_repo_pack_fds_open(&pack_fds);
6678 	if (error != NULL)
6679 		goto done;
6680 
6681 	if (repo_path == NULL) {
6682 		cwd = getcwd(NULL, 0);
6683 		if (cwd == NULL)
6684 			return got_error_from_errno("getcwd");
6685 		error = got_worktree_open(&worktree, cwd);
6686 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6687 			goto done;
6688 		if (worktree)
6689 			repo_path =
6690 			    strdup(got_worktree_get_repo_path(worktree));
6691 		else
6692 			repo_path = strdup(cwd);
6693 		if (repo_path == NULL) {
6694 			error = got_error_from_errno("strdup");
6695 			goto done;
6696 		}
6697 	}
6698 
6699 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6700 	if (error != NULL)
6701 		goto done;
6702 
6703 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6704 	    worktree);
6705 	if (error)
6706 		goto done;
6707 
6708 	init_curses();
6709 
6710 	error = apply_unveil(got_repo_get_path(repo), NULL);
6711 	if (error)
6712 		goto done;
6713 
6714 	error = tog_load_refs(repo, 0);
6715 	if (error)
6716 		goto done;
6717 
6718 	if (commit_id_str == NULL) {
6719 		struct got_reference *head_ref;
6720 		error = got_ref_open(&head_ref, repo, worktree ?
6721 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6722 		if (error != NULL)
6723 			goto done;
6724 		error = got_ref_resolve(&commit_id, repo, head_ref);
6725 		got_ref_close(head_ref);
6726 	} else {
6727 		error = got_repo_match_object_id(&commit_id, NULL,
6728 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6729 	}
6730 	if (error != NULL)
6731 		goto done;
6732 
6733 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6734 	if (view == NULL) {
6735 		error = got_error_from_errno("view_open");
6736 		goto done;
6737 	}
6738 
6739 	error = got_object_open_as_commit(&commit, repo, commit_id);
6740 	if (error)
6741 		goto done;
6742 
6743 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6744 	    commit, repo);
6745 	if (error)
6746 		goto done;
6747 
6748 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6749 	    commit_id, repo);
6750 	if (error)
6751 		goto done;
6752 	if (worktree) {
6753 		/* Release work tree lock. */
6754 		got_worktree_close(worktree);
6755 		worktree = NULL;
6756 	}
6757 	error = view_loop(view);
6758 done:
6759 	free(repo_path);
6760 	free(in_repo_path);
6761 	free(link_target);
6762 	free(cwd);
6763 	free(commit_id);
6764 	if (commit)
6765 		got_object_commit_close(commit);
6766 	if (worktree)
6767 		got_worktree_close(worktree);
6768 	if (repo) {
6769 		const struct got_error *close_err = got_repo_close(repo);
6770 		if (error == NULL)
6771 			error = close_err;
6772 	}
6773 	if (pack_fds) {
6774 		const struct got_error *pack_err =
6775 		    got_repo_pack_fds_close(pack_fds);
6776 		if (error == NULL)
6777 			error = pack_err;
6778 	}
6779 	tog_free_refs();
6780 	return error;
6781 }
6782 
6783 static const struct got_error *
6784 draw_tree_entries(struct tog_view *view, const char *parent_path)
6785 {
6786 	struct tog_tree_view_state *s = &view->state.tree;
6787 	const struct got_error *err = NULL;
6788 	struct got_tree_entry *te;
6789 	wchar_t *wline;
6790 	char *index = NULL;
6791 	struct tog_color *tc;
6792 	int width, n, nentries, scrollx, i = 1;
6793 	int limit = view->nlines;
6794 
6795 	s->ndisplayed = 0;
6796 	if (view_is_hsplit_top(view))
6797 		--limit;  /* border */
6798 
6799 	werase(view->window);
6800 
6801 	if (limit == 0)
6802 		return NULL;
6803 
6804 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6805 	    0, 0);
6806 	if (err)
6807 		return err;
6808 	if (view_needs_focus_indication(view))
6809 		wstandout(view->window);
6810 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6811 	if (tc)
6812 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6813 	waddwstr(view->window, wline);
6814 	free(wline);
6815 	wline = NULL;
6816 	while (width++ < view->ncols)
6817 		waddch(view->window, ' ');
6818 	if (tc)
6819 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6820 	if (view_needs_focus_indication(view))
6821 		wstandend(view->window);
6822 	if (--limit <= 0)
6823 		return NULL;
6824 
6825 	i += s->selected;
6826 	if (s->first_displayed_entry) {
6827 		i += got_tree_entry_get_index(s->first_displayed_entry);
6828 		if (s->tree != s->root)
6829 			++i;  /* account for ".." entry */
6830 	}
6831 	nentries = got_object_tree_get_nentries(s->tree);
6832 	if (asprintf(&index, "[%d/%d] %s",
6833 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6834 		return got_error_from_errno("asprintf");
6835 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6836 	free(index);
6837 	if (err)
6838 		return err;
6839 	waddwstr(view->window, wline);
6840 	free(wline);
6841 	wline = NULL;
6842 	if (width < view->ncols - 1)
6843 		waddch(view->window, '\n');
6844 	if (--limit <= 0)
6845 		return NULL;
6846 	waddch(view->window, '\n');
6847 	if (--limit <= 0)
6848 		return NULL;
6849 
6850 	if (s->first_displayed_entry == NULL) {
6851 		te = got_object_tree_get_first_entry(s->tree);
6852 		if (s->selected == 0) {
6853 			if (view->focussed)
6854 				wstandout(view->window);
6855 			s->selected_entry = NULL;
6856 		}
6857 		waddstr(view->window, "  ..\n");	/* parent directory */
6858 		if (s->selected == 0 && view->focussed)
6859 			wstandend(view->window);
6860 		s->ndisplayed++;
6861 		if (--limit <= 0)
6862 			return NULL;
6863 		n = 1;
6864 	} else {
6865 		n = 0;
6866 		te = s->first_displayed_entry;
6867 	}
6868 
6869 	view->maxx = 0;
6870 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6871 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6872 		const char *modestr = "";
6873 		mode_t mode;
6874 
6875 		te = got_object_tree_get_entry(s->tree, i);
6876 		mode = got_tree_entry_get_mode(te);
6877 
6878 		if (s->show_ids) {
6879 			err = got_object_id_str(&id_str,
6880 			    got_tree_entry_get_id(te));
6881 			if (err)
6882 				return got_error_from_errno(
6883 				    "got_object_id_str");
6884 		}
6885 		if (got_object_tree_entry_is_submodule(te))
6886 			modestr = "$";
6887 		else if (S_ISLNK(mode)) {
6888 			int i;
6889 
6890 			err = got_tree_entry_get_symlink_target(&link_target,
6891 			    te, s->repo);
6892 			if (err) {
6893 				free(id_str);
6894 				return err;
6895 			}
6896 			for (i = 0; i < strlen(link_target); i++) {
6897 				if (!isprint((unsigned char)link_target[i]))
6898 					link_target[i] = '?';
6899 			}
6900 			modestr = "@";
6901 		}
6902 		else if (S_ISDIR(mode))
6903 			modestr = "/";
6904 		else if (mode & S_IXUSR)
6905 			modestr = "*";
6906 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6907 		    got_tree_entry_get_name(te), modestr,
6908 		    link_target ? " -> ": "",
6909 		    link_target ? link_target : "") == -1) {
6910 			free(id_str);
6911 			free(link_target);
6912 			return got_error_from_errno("asprintf");
6913 		}
6914 		free(id_str);
6915 		free(link_target);
6916 
6917 		/* use full line width to determine view->maxx */
6918 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
6919 		if (err) {
6920 			free(line);
6921 			break;
6922 		}
6923 		view->maxx = MAX(view->maxx, width);
6924 		free(wline);
6925 		wline = NULL;
6926 
6927 		err = format_line(&wline, &width, &scrollx, line, view->x,
6928 		    view->ncols, 0, 0);
6929 		if (err) {
6930 			free(line);
6931 			break;
6932 		}
6933 		if (n == s->selected) {
6934 			if (view->focussed)
6935 				wstandout(view->window);
6936 			s->selected_entry = te;
6937 		}
6938 		tc = match_color(&s->colors, line);
6939 		if (tc)
6940 			wattr_on(view->window,
6941 			    COLOR_PAIR(tc->colorpair), NULL);
6942 		waddwstr(view->window, &wline[scrollx]);
6943 		if (tc)
6944 			wattr_off(view->window,
6945 			    COLOR_PAIR(tc->colorpair), NULL);
6946 		if (width < view->ncols)
6947 			waddch(view->window, '\n');
6948 		if (n == s->selected && view->focussed)
6949 			wstandend(view->window);
6950 		free(line);
6951 		free(wline);
6952 		wline = NULL;
6953 		n++;
6954 		s->ndisplayed++;
6955 		s->last_displayed_entry = te;
6956 		if (--limit <= 0)
6957 			break;
6958 	}
6959 
6960 	return err;
6961 }
6962 
6963 static void
6964 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6965 {
6966 	struct got_tree_entry *te;
6967 	int isroot = s->tree == s->root;
6968 	int i = 0;
6969 
6970 	if (s->first_displayed_entry == NULL)
6971 		return;
6972 
6973 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6974 	while (i++ < maxscroll) {
6975 		if (te == NULL) {
6976 			if (!isroot)
6977 				s->first_displayed_entry = NULL;
6978 			break;
6979 		}
6980 		s->first_displayed_entry = te;
6981 		te = got_tree_entry_get_prev(s->tree, te);
6982 	}
6983 }
6984 
6985 static const struct got_error *
6986 tree_scroll_down(struct tog_view *view, int maxscroll)
6987 {
6988 	struct tog_tree_view_state *s = &view->state.tree;
6989 	struct got_tree_entry *next, *last;
6990 	int n = 0;
6991 
6992 	if (s->first_displayed_entry)
6993 		next = got_tree_entry_get_next(s->tree,
6994 		    s->first_displayed_entry);
6995 	else
6996 		next = got_object_tree_get_first_entry(s->tree);
6997 
6998 	last = s->last_displayed_entry;
6999 	while (next && n++ < maxscroll) {
7000 		if (last) {
7001 			s->last_displayed_entry = last;
7002 			last = got_tree_entry_get_next(s->tree, last);
7003 		}
7004 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7005 			s->first_displayed_entry = next;
7006 			next = got_tree_entry_get_next(s->tree, next);
7007 		}
7008 	}
7009 
7010 	return NULL;
7011 }
7012 
7013 static const struct got_error *
7014 tree_entry_path(char **path, struct tog_parent_trees *parents,
7015     struct got_tree_entry *te)
7016 {
7017 	const struct got_error *err = NULL;
7018 	struct tog_parent_tree *pt;
7019 	size_t len = 2; /* for leading slash and NUL */
7020 
7021 	TAILQ_FOREACH(pt, parents, entry)
7022 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7023 		    + 1 /* slash */;
7024 	if (te)
7025 		len += strlen(got_tree_entry_get_name(te));
7026 
7027 	*path = calloc(1, len);
7028 	if (path == NULL)
7029 		return got_error_from_errno("calloc");
7030 
7031 	(*path)[0] = '/';
7032 	pt = TAILQ_LAST(parents, tog_parent_trees);
7033 	while (pt) {
7034 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7035 		if (strlcat(*path, name, len) >= len) {
7036 			err = got_error(GOT_ERR_NO_SPACE);
7037 			goto done;
7038 		}
7039 		if (strlcat(*path, "/", len) >= len) {
7040 			err = got_error(GOT_ERR_NO_SPACE);
7041 			goto done;
7042 		}
7043 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7044 	}
7045 	if (te) {
7046 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7047 			err = got_error(GOT_ERR_NO_SPACE);
7048 			goto done;
7049 		}
7050 	}
7051 done:
7052 	if (err) {
7053 		free(*path);
7054 		*path = NULL;
7055 	}
7056 	return err;
7057 }
7058 
7059 static const struct got_error *
7060 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7061     struct got_tree_entry *te, struct tog_parent_trees *parents,
7062     struct got_object_id *commit_id, struct got_repository *repo)
7063 {
7064 	const struct got_error *err = NULL;
7065 	char *path;
7066 	struct tog_view *blame_view;
7067 
7068 	*new_view = NULL;
7069 
7070 	err = tree_entry_path(&path, parents, te);
7071 	if (err)
7072 		return err;
7073 
7074 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7075 	if (blame_view == NULL) {
7076 		err = got_error_from_errno("view_open");
7077 		goto done;
7078 	}
7079 
7080 	err = open_blame_view(blame_view, path, commit_id, repo);
7081 	if (err) {
7082 		if (err->code == GOT_ERR_CANCELLED)
7083 			err = NULL;
7084 		view_close(blame_view);
7085 	} else
7086 		*new_view = blame_view;
7087 done:
7088 	free(path);
7089 	return err;
7090 }
7091 
7092 static const struct got_error *
7093 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7094     struct tog_tree_view_state *s)
7095 {
7096 	struct tog_view *log_view;
7097 	const struct got_error *err = NULL;
7098 	char *path;
7099 
7100 	*new_view = NULL;
7101 
7102 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7103 	if (log_view == NULL)
7104 		return got_error_from_errno("view_open");
7105 
7106 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7107 	if (err)
7108 		return err;
7109 
7110 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7111 	    path, 0);
7112 	if (err)
7113 		view_close(log_view);
7114 	else
7115 		*new_view = log_view;
7116 	free(path);
7117 	return err;
7118 }
7119 
7120 static const struct got_error *
7121 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7122     const char *head_ref_name, struct got_repository *repo)
7123 {
7124 	const struct got_error *err = NULL;
7125 	char *commit_id_str = NULL;
7126 	struct tog_tree_view_state *s = &view->state.tree;
7127 	struct got_commit_object *commit = NULL;
7128 
7129 	TAILQ_INIT(&s->parents);
7130 	STAILQ_INIT(&s->colors);
7131 
7132 	s->commit_id = got_object_id_dup(commit_id);
7133 	if (s->commit_id == NULL)
7134 		return got_error_from_errno("got_object_id_dup");
7135 
7136 	err = got_object_open_as_commit(&commit, repo, commit_id);
7137 	if (err)
7138 		goto done;
7139 
7140 	/*
7141 	 * The root is opened here and will be closed when the view is closed.
7142 	 * Any visited subtrees and their path-wise parents are opened and
7143 	 * closed on demand.
7144 	 */
7145 	err = got_object_open_as_tree(&s->root, repo,
7146 	    got_object_commit_get_tree_id(commit));
7147 	if (err)
7148 		goto done;
7149 	s->tree = s->root;
7150 
7151 	err = got_object_id_str(&commit_id_str, commit_id);
7152 	if (err != NULL)
7153 		goto done;
7154 
7155 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7156 		err = got_error_from_errno("asprintf");
7157 		goto done;
7158 	}
7159 
7160 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7161 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7162 	if (head_ref_name) {
7163 		s->head_ref_name = strdup(head_ref_name);
7164 		if (s->head_ref_name == NULL) {
7165 			err = got_error_from_errno("strdup");
7166 			goto done;
7167 		}
7168 	}
7169 	s->repo = repo;
7170 
7171 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7172 		err = add_color(&s->colors, "\\$$",
7173 		    TOG_COLOR_TREE_SUBMODULE,
7174 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7175 		if (err)
7176 			goto done;
7177 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7178 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7179 		if (err)
7180 			goto done;
7181 		err = add_color(&s->colors, "/$",
7182 		    TOG_COLOR_TREE_DIRECTORY,
7183 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7184 		if (err)
7185 			goto done;
7186 
7187 		err = add_color(&s->colors, "\\*$",
7188 		    TOG_COLOR_TREE_EXECUTABLE,
7189 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7190 		if (err)
7191 			goto done;
7192 
7193 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7194 		    get_color_value("TOG_COLOR_COMMIT"));
7195 		if (err)
7196 			goto done;
7197 	}
7198 
7199 	view->show = show_tree_view;
7200 	view->input = input_tree_view;
7201 	view->close = close_tree_view;
7202 	view->search_start = search_start_tree_view;
7203 	view->search_next = search_next_tree_view;
7204 done:
7205 	free(commit_id_str);
7206 	if (commit)
7207 		got_object_commit_close(commit);
7208 	if (err)
7209 		close_tree_view(view);
7210 	return err;
7211 }
7212 
7213 static const struct got_error *
7214 close_tree_view(struct tog_view *view)
7215 {
7216 	struct tog_tree_view_state *s = &view->state.tree;
7217 
7218 	free_colors(&s->colors);
7219 	free(s->tree_label);
7220 	s->tree_label = NULL;
7221 	free(s->commit_id);
7222 	s->commit_id = NULL;
7223 	free(s->head_ref_name);
7224 	s->head_ref_name = NULL;
7225 	while (!TAILQ_EMPTY(&s->parents)) {
7226 		struct tog_parent_tree *parent;
7227 		parent = TAILQ_FIRST(&s->parents);
7228 		TAILQ_REMOVE(&s->parents, parent, entry);
7229 		if (parent->tree != s->root)
7230 			got_object_tree_close(parent->tree);
7231 		free(parent);
7232 
7233 	}
7234 	if (s->tree != NULL && s->tree != s->root)
7235 		got_object_tree_close(s->tree);
7236 	if (s->root)
7237 		got_object_tree_close(s->root);
7238 	return NULL;
7239 }
7240 
7241 static const struct got_error *
7242 search_start_tree_view(struct tog_view *view)
7243 {
7244 	struct tog_tree_view_state *s = &view->state.tree;
7245 
7246 	s->matched_entry = NULL;
7247 	return NULL;
7248 }
7249 
7250 static int
7251 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7252 {
7253 	regmatch_t regmatch;
7254 
7255 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7256 	    0) == 0;
7257 }
7258 
7259 static const struct got_error *
7260 search_next_tree_view(struct tog_view *view)
7261 {
7262 	struct tog_tree_view_state *s = &view->state.tree;
7263 	struct got_tree_entry *te = NULL;
7264 
7265 	if (!view->searching) {
7266 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7267 		return NULL;
7268 	}
7269 
7270 	if (s->matched_entry) {
7271 		if (view->searching == TOG_SEARCH_FORWARD) {
7272 			if (s->selected_entry)
7273 				te = got_tree_entry_get_next(s->tree,
7274 				    s->selected_entry);
7275 			else
7276 				te = got_object_tree_get_first_entry(s->tree);
7277 		} else {
7278 			if (s->selected_entry == NULL)
7279 				te = got_object_tree_get_last_entry(s->tree);
7280 			else
7281 				te = got_tree_entry_get_prev(s->tree,
7282 				    s->selected_entry);
7283 		}
7284 	} else {
7285 		if (s->selected_entry)
7286 			te = s->selected_entry;
7287 		else if (view->searching == TOG_SEARCH_FORWARD)
7288 			te = got_object_tree_get_first_entry(s->tree);
7289 		else
7290 			te = got_object_tree_get_last_entry(s->tree);
7291 	}
7292 
7293 	while (1) {
7294 		if (te == NULL) {
7295 			if (s->matched_entry == NULL) {
7296 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7297 				return NULL;
7298 			}
7299 			if (view->searching == TOG_SEARCH_FORWARD)
7300 				te = got_object_tree_get_first_entry(s->tree);
7301 			else
7302 				te = got_object_tree_get_last_entry(s->tree);
7303 		}
7304 
7305 		if (match_tree_entry(te, &view->regex)) {
7306 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7307 			s->matched_entry = te;
7308 			break;
7309 		}
7310 
7311 		if (view->searching == TOG_SEARCH_FORWARD)
7312 			te = got_tree_entry_get_next(s->tree, te);
7313 		else
7314 			te = got_tree_entry_get_prev(s->tree, te);
7315 	}
7316 
7317 	if (s->matched_entry) {
7318 		s->first_displayed_entry = s->matched_entry;
7319 		s->selected = 0;
7320 	}
7321 
7322 	return NULL;
7323 }
7324 
7325 static const struct got_error *
7326 show_tree_view(struct tog_view *view)
7327 {
7328 	const struct got_error *err = NULL;
7329 	struct tog_tree_view_state *s = &view->state.tree;
7330 	char *parent_path;
7331 
7332 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7333 	if (err)
7334 		return err;
7335 
7336 	err = draw_tree_entries(view, parent_path);
7337 	free(parent_path);
7338 
7339 	view_border(view);
7340 	return err;
7341 }
7342 
7343 static const struct got_error *
7344 tree_goto_line(struct tog_view *view, int nlines)
7345 {
7346 	const struct got_error		 *err = NULL;
7347 	struct tog_tree_view_state	 *s = &view->state.tree;
7348 	struct got_tree_entry		**fte, **lte, **ste;
7349 	int				  g, last, first = 1, i = 1;
7350 	int				  root = s->tree == s->root;
7351 	int				  off = root ? 1 : 2;
7352 
7353 	g = view->gline;
7354 	view->gline = 0;
7355 
7356 	if (g == 0)
7357 		g = 1;
7358 	else if (g > got_object_tree_get_nentries(s->tree))
7359 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7360 
7361 	fte = &s->first_displayed_entry;
7362 	lte = &s->last_displayed_entry;
7363 	ste = &s->selected_entry;
7364 
7365 	if (*fte != NULL) {
7366 		first = got_tree_entry_get_index(*fte);
7367 		first += off;  /* account for ".." */
7368 	}
7369 	last = got_tree_entry_get_index(*lte);
7370 	last += off;
7371 
7372 	if (g >= first && g <= last && g - first < nlines) {
7373 		s->selected = g - first;
7374 		return NULL;	/* gline is on the current page */
7375 	}
7376 
7377 	if (*ste != NULL) {
7378 		i = got_tree_entry_get_index(*ste);
7379 		i += off;
7380 	}
7381 
7382 	if (i < g) {
7383 		err = tree_scroll_down(view, g - i);
7384 		if (err)
7385 			return err;
7386 		if (got_tree_entry_get_index(*lte) >=
7387 		    got_object_tree_get_nentries(s->tree) - 1 &&
7388 		    first + s->selected < g &&
7389 		    s->selected < s->ndisplayed - 1) {
7390 			first = got_tree_entry_get_index(*fte);
7391 			first += off;
7392 			s->selected = g - first;
7393 		}
7394 	} else if (i > g)
7395 		tree_scroll_up(s, i - g);
7396 
7397 	if (g < nlines &&
7398 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7399 		s->selected = g - 1;
7400 
7401 	return NULL;
7402 }
7403 
7404 static const struct got_error *
7405 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7406 {
7407 	const struct got_error *err = NULL;
7408 	struct tog_tree_view_state *s = &view->state.tree;
7409 	struct got_tree_entry *te;
7410 	int n, nscroll = view->nlines - 3;
7411 
7412 	if (view->gline)
7413 		return tree_goto_line(view, nscroll);
7414 
7415 	switch (ch) {
7416 	case '0':
7417 	case '$':
7418 	case KEY_RIGHT:
7419 	case 'l':
7420 	case KEY_LEFT:
7421 	case 'h':
7422 		horizontal_scroll_input(view, ch);
7423 		break;
7424 	case 'i':
7425 		s->show_ids = !s->show_ids;
7426 		view->count = 0;
7427 		break;
7428 	case 'L':
7429 		view->count = 0;
7430 		if (!s->selected_entry)
7431 			break;
7432 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7433 		break;
7434 	case 'R':
7435 		view->count = 0;
7436 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7437 		break;
7438 	case 'g':
7439 	case '=':
7440 	case KEY_HOME:
7441 		s->selected = 0;
7442 		view->count = 0;
7443 		if (s->tree == s->root)
7444 			s->first_displayed_entry =
7445 			    got_object_tree_get_first_entry(s->tree);
7446 		else
7447 			s->first_displayed_entry = NULL;
7448 		break;
7449 	case 'G':
7450 	case '*':
7451 	case KEY_END: {
7452 		int eos = view->nlines - 3;
7453 
7454 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7455 			--eos;  /* border */
7456 		s->selected = 0;
7457 		view->count = 0;
7458 		te = got_object_tree_get_last_entry(s->tree);
7459 		for (n = 0; n < eos; n++) {
7460 			if (te == NULL) {
7461 				if (s->tree != s->root) {
7462 					s->first_displayed_entry = NULL;
7463 					n++;
7464 				}
7465 				break;
7466 			}
7467 			s->first_displayed_entry = te;
7468 			te = got_tree_entry_get_prev(s->tree, te);
7469 		}
7470 		if (n > 0)
7471 			s->selected = n - 1;
7472 		break;
7473 	}
7474 	case 'k':
7475 	case KEY_UP:
7476 	case CTRL('p'):
7477 		if (s->selected > 0) {
7478 			s->selected--;
7479 			break;
7480 		}
7481 		tree_scroll_up(s, 1);
7482 		if (s->selected_entry == NULL ||
7483 		    (s->tree == s->root && s->selected_entry ==
7484 		     got_object_tree_get_first_entry(s->tree)))
7485 			view->count = 0;
7486 		break;
7487 	case CTRL('u'):
7488 	case 'u':
7489 		nscroll /= 2;
7490 		/* FALL THROUGH */
7491 	case KEY_PPAGE:
7492 	case CTRL('b'):
7493 	case 'b':
7494 		if (s->tree == s->root) {
7495 			if (got_object_tree_get_first_entry(s->tree) ==
7496 			    s->first_displayed_entry)
7497 				s->selected -= MIN(s->selected, nscroll);
7498 		} else {
7499 			if (s->first_displayed_entry == NULL)
7500 				s->selected -= MIN(s->selected, nscroll);
7501 		}
7502 		tree_scroll_up(s, MAX(0, nscroll));
7503 		if (s->selected_entry == NULL ||
7504 		    (s->tree == s->root && s->selected_entry ==
7505 		     got_object_tree_get_first_entry(s->tree)))
7506 			view->count = 0;
7507 		break;
7508 	case 'j':
7509 	case KEY_DOWN:
7510 	case CTRL('n'):
7511 		if (s->selected < s->ndisplayed - 1) {
7512 			s->selected++;
7513 			break;
7514 		}
7515 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7516 		    == NULL) {
7517 			/* can't scroll any further */
7518 			view->count = 0;
7519 			break;
7520 		}
7521 		tree_scroll_down(view, 1);
7522 		break;
7523 	case CTRL('d'):
7524 	case 'd':
7525 		nscroll /= 2;
7526 		/* FALL THROUGH */
7527 	case KEY_NPAGE:
7528 	case CTRL('f'):
7529 	case 'f':
7530 	case ' ':
7531 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7532 		    == NULL) {
7533 			/* can't scroll any further; move cursor down */
7534 			if (s->selected < s->ndisplayed - 1)
7535 				s->selected += MIN(nscroll,
7536 				    s->ndisplayed - s->selected - 1);
7537 			else
7538 				view->count = 0;
7539 			break;
7540 		}
7541 		tree_scroll_down(view, nscroll);
7542 		break;
7543 	case KEY_ENTER:
7544 	case '\r':
7545 	case KEY_BACKSPACE:
7546 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7547 			struct tog_parent_tree *parent;
7548 			/* user selected '..' */
7549 			if (s->tree == s->root) {
7550 				view->count = 0;
7551 				break;
7552 			}
7553 			parent = TAILQ_FIRST(&s->parents);
7554 			TAILQ_REMOVE(&s->parents, parent,
7555 			    entry);
7556 			got_object_tree_close(s->tree);
7557 			s->tree = parent->tree;
7558 			s->first_displayed_entry =
7559 			    parent->first_displayed_entry;
7560 			s->selected_entry =
7561 			    parent->selected_entry;
7562 			s->selected = parent->selected;
7563 			if (s->selected > view->nlines - 3) {
7564 				err = offset_selection_down(view);
7565 				if (err)
7566 					break;
7567 			}
7568 			free(parent);
7569 		} else if (S_ISDIR(got_tree_entry_get_mode(
7570 		    s->selected_entry))) {
7571 			struct got_tree_object *subtree;
7572 			view->count = 0;
7573 			err = got_object_open_as_tree(&subtree, s->repo,
7574 			    got_tree_entry_get_id(s->selected_entry));
7575 			if (err)
7576 				break;
7577 			err = tree_view_visit_subtree(s, subtree);
7578 			if (err) {
7579 				got_object_tree_close(subtree);
7580 				break;
7581 			}
7582 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7583 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7584 		break;
7585 	case KEY_RESIZE:
7586 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7587 			s->selected = view->nlines - 4;
7588 		view->count = 0;
7589 		break;
7590 	default:
7591 		view->count = 0;
7592 		break;
7593 	}
7594 
7595 	return err;
7596 }
7597 
7598 __dead static void
7599 usage_tree(void)
7600 {
7601 	endwin();
7602 	fprintf(stderr,
7603 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7604 	    getprogname());
7605 	exit(1);
7606 }
7607 
7608 static const struct got_error *
7609 cmd_tree(int argc, char *argv[])
7610 {
7611 	const struct got_error *error;
7612 	struct got_repository *repo = NULL;
7613 	struct got_worktree *worktree = NULL;
7614 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7615 	struct got_object_id *commit_id = NULL;
7616 	struct got_commit_object *commit = NULL;
7617 	const char *commit_id_arg = NULL;
7618 	char *label = NULL;
7619 	struct got_reference *ref = NULL;
7620 	const char *head_ref_name = NULL;
7621 	int ch;
7622 	struct tog_view *view;
7623 	int *pack_fds = NULL;
7624 
7625 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7626 		switch (ch) {
7627 		case 'c':
7628 			commit_id_arg = optarg;
7629 			break;
7630 		case 'r':
7631 			repo_path = realpath(optarg, NULL);
7632 			if (repo_path == NULL)
7633 				return got_error_from_errno2("realpath",
7634 				    optarg);
7635 			break;
7636 		default:
7637 			usage_tree();
7638 			/* NOTREACHED */
7639 		}
7640 	}
7641 
7642 	argc -= optind;
7643 	argv += optind;
7644 
7645 	if (argc > 1)
7646 		usage_tree();
7647 
7648 	error = got_repo_pack_fds_open(&pack_fds);
7649 	if (error != NULL)
7650 		goto done;
7651 
7652 	if (repo_path == NULL) {
7653 		cwd = getcwd(NULL, 0);
7654 		if (cwd == NULL)
7655 			return got_error_from_errno("getcwd");
7656 		error = got_worktree_open(&worktree, cwd);
7657 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7658 			goto done;
7659 		if (worktree)
7660 			repo_path =
7661 			    strdup(got_worktree_get_repo_path(worktree));
7662 		else
7663 			repo_path = strdup(cwd);
7664 		if (repo_path == NULL) {
7665 			error = got_error_from_errno("strdup");
7666 			goto done;
7667 		}
7668 	}
7669 
7670 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7671 	if (error != NULL)
7672 		goto done;
7673 
7674 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7675 	    repo, worktree);
7676 	if (error)
7677 		goto done;
7678 
7679 	init_curses();
7680 
7681 	error = apply_unveil(got_repo_get_path(repo), NULL);
7682 	if (error)
7683 		goto done;
7684 
7685 	error = tog_load_refs(repo, 0);
7686 	if (error)
7687 		goto done;
7688 
7689 	if (commit_id_arg == NULL) {
7690 		error = got_repo_match_object_id(&commit_id, &label,
7691 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7692 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7693 		if (error)
7694 			goto done;
7695 		head_ref_name = label;
7696 	} else {
7697 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7698 		if (error == NULL)
7699 			head_ref_name = got_ref_get_name(ref);
7700 		else if (error->code != GOT_ERR_NOT_REF)
7701 			goto done;
7702 		error = got_repo_match_object_id(&commit_id, NULL,
7703 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7704 		if (error)
7705 			goto done;
7706 	}
7707 
7708 	error = got_object_open_as_commit(&commit, repo, commit_id);
7709 	if (error)
7710 		goto done;
7711 
7712 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7713 	if (view == NULL) {
7714 		error = got_error_from_errno("view_open");
7715 		goto done;
7716 	}
7717 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7718 	if (error)
7719 		goto done;
7720 	if (!got_path_is_root_dir(in_repo_path)) {
7721 		error = tree_view_walk_path(&view->state.tree, commit,
7722 		    in_repo_path);
7723 		if (error)
7724 			goto done;
7725 	}
7726 
7727 	if (worktree) {
7728 		/* Release work tree lock. */
7729 		got_worktree_close(worktree);
7730 		worktree = NULL;
7731 	}
7732 	error = view_loop(view);
7733 done:
7734 	free(repo_path);
7735 	free(cwd);
7736 	free(commit_id);
7737 	free(label);
7738 	if (ref)
7739 		got_ref_close(ref);
7740 	if (repo) {
7741 		const struct got_error *close_err = got_repo_close(repo);
7742 		if (error == NULL)
7743 			error = close_err;
7744 	}
7745 	if (pack_fds) {
7746 		const struct got_error *pack_err =
7747 		    got_repo_pack_fds_close(pack_fds);
7748 		if (error == NULL)
7749 			error = pack_err;
7750 	}
7751 	tog_free_refs();
7752 	return error;
7753 }
7754 
7755 static const struct got_error *
7756 ref_view_load_refs(struct tog_ref_view_state *s)
7757 {
7758 	struct got_reflist_entry *sre;
7759 	struct tog_reflist_entry *re;
7760 
7761 	s->nrefs = 0;
7762 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7763 		if (strncmp(got_ref_get_name(sre->ref),
7764 		    "refs/got/", 9) == 0 &&
7765 		    strncmp(got_ref_get_name(sre->ref),
7766 		    "refs/got/backup/", 16) != 0)
7767 			continue;
7768 
7769 		re = malloc(sizeof(*re));
7770 		if (re == NULL)
7771 			return got_error_from_errno("malloc");
7772 
7773 		re->ref = got_ref_dup(sre->ref);
7774 		if (re->ref == NULL)
7775 			return got_error_from_errno("got_ref_dup");
7776 		re->idx = s->nrefs++;
7777 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7778 	}
7779 
7780 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7781 	return NULL;
7782 }
7783 
7784 static void
7785 ref_view_free_refs(struct tog_ref_view_state *s)
7786 {
7787 	struct tog_reflist_entry *re;
7788 
7789 	while (!TAILQ_EMPTY(&s->refs)) {
7790 		re = TAILQ_FIRST(&s->refs);
7791 		TAILQ_REMOVE(&s->refs, re, entry);
7792 		got_ref_close(re->ref);
7793 		free(re);
7794 	}
7795 }
7796 
7797 static const struct got_error *
7798 open_ref_view(struct tog_view *view, struct got_repository *repo)
7799 {
7800 	const struct got_error *err = NULL;
7801 	struct tog_ref_view_state *s = &view->state.ref;
7802 
7803 	s->selected_entry = 0;
7804 	s->repo = repo;
7805 
7806 	TAILQ_INIT(&s->refs);
7807 	STAILQ_INIT(&s->colors);
7808 
7809 	err = ref_view_load_refs(s);
7810 	if (err)
7811 		return err;
7812 
7813 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7814 		err = add_color(&s->colors, "^refs/heads/",
7815 		    TOG_COLOR_REFS_HEADS,
7816 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7817 		if (err)
7818 			goto done;
7819 
7820 		err = add_color(&s->colors, "^refs/tags/",
7821 		    TOG_COLOR_REFS_TAGS,
7822 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7823 		if (err)
7824 			goto done;
7825 
7826 		err = add_color(&s->colors, "^refs/remotes/",
7827 		    TOG_COLOR_REFS_REMOTES,
7828 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7829 		if (err)
7830 			goto done;
7831 
7832 		err = add_color(&s->colors, "^refs/got/backup/",
7833 		    TOG_COLOR_REFS_BACKUP,
7834 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7835 		if (err)
7836 			goto done;
7837 	}
7838 
7839 	view->show = show_ref_view;
7840 	view->input = input_ref_view;
7841 	view->close = close_ref_view;
7842 	view->search_start = search_start_ref_view;
7843 	view->search_next = search_next_ref_view;
7844 done:
7845 	if (err)
7846 		free_colors(&s->colors);
7847 	return err;
7848 }
7849 
7850 static const struct got_error *
7851 close_ref_view(struct tog_view *view)
7852 {
7853 	struct tog_ref_view_state *s = &view->state.ref;
7854 
7855 	ref_view_free_refs(s);
7856 	free_colors(&s->colors);
7857 
7858 	return NULL;
7859 }
7860 
7861 static const struct got_error *
7862 resolve_reflist_entry(struct got_object_id **commit_id,
7863     struct tog_reflist_entry *re, struct got_repository *repo)
7864 {
7865 	const struct got_error *err = NULL;
7866 	struct got_object_id *obj_id;
7867 	struct got_tag_object *tag = NULL;
7868 	int obj_type;
7869 
7870 	*commit_id = NULL;
7871 
7872 	err = got_ref_resolve(&obj_id, repo, re->ref);
7873 	if (err)
7874 		return err;
7875 
7876 	err = got_object_get_type(&obj_type, repo, obj_id);
7877 	if (err)
7878 		goto done;
7879 
7880 	switch (obj_type) {
7881 	case GOT_OBJ_TYPE_COMMIT:
7882 		*commit_id = obj_id;
7883 		break;
7884 	case GOT_OBJ_TYPE_TAG:
7885 		err = got_object_open_as_tag(&tag, repo, obj_id);
7886 		if (err)
7887 			goto done;
7888 		free(obj_id);
7889 		err = got_object_get_type(&obj_type, repo,
7890 		    got_object_tag_get_object_id(tag));
7891 		if (err)
7892 			goto done;
7893 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7894 			err = got_error(GOT_ERR_OBJ_TYPE);
7895 			goto done;
7896 		}
7897 		*commit_id = got_object_id_dup(
7898 		    got_object_tag_get_object_id(tag));
7899 		if (*commit_id == NULL) {
7900 			err = got_error_from_errno("got_object_id_dup");
7901 			goto done;
7902 		}
7903 		break;
7904 	default:
7905 		err = got_error(GOT_ERR_OBJ_TYPE);
7906 		break;
7907 	}
7908 
7909 done:
7910 	if (tag)
7911 		got_object_tag_close(tag);
7912 	if (err) {
7913 		free(*commit_id);
7914 		*commit_id = NULL;
7915 	}
7916 	return err;
7917 }
7918 
7919 static const struct got_error *
7920 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7921     struct tog_reflist_entry *re, struct got_repository *repo)
7922 {
7923 	struct tog_view *log_view;
7924 	const struct got_error *err = NULL;
7925 	struct got_object_id *commit_id = NULL;
7926 
7927 	*new_view = NULL;
7928 
7929 	err = resolve_reflist_entry(&commit_id, re, repo);
7930 	if (err) {
7931 		if (err->code != GOT_ERR_OBJ_TYPE)
7932 			return err;
7933 		else
7934 			return NULL;
7935 	}
7936 
7937 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7938 	if (log_view == NULL) {
7939 		err = got_error_from_errno("view_open");
7940 		goto done;
7941 	}
7942 
7943 	err = open_log_view(log_view, commit_id, repo,
7944 	    got_ref_get_name(re->ref), "", 0);
7945 done:
7946 	if (err)
7947 		view_close(log_view);
7948 	else
7949 		*new_view = log_view;
7950 	free(commit_id);
7951 	return err;
7952 }
7953 
7954 static void
7955 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7956 {
7957 	struct tog_reflist_entry *re;
7958 	int i = 0;
7959 
7960 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7961 		return;
7962 
7963 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7964 	while (i++ < maxscroll) {
7965 		if (re == NULL)
7966 			break;
7967 		s->first_displayed_entry = re;
7968 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7969 	}
7970 }
7971 
7972 static const struct got_error *
7973 ref_scroll_down(struct tog_view *view, int maxscroll)
7974 {
7975 	struct tog_ref_view_state *s = &view->state.ref;
7976 	struct tog_reflist_entry *next, *last;
7977 	int n = 0;
7978 
7979 	if (s->first_displayed_entry)
7980 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7981 	else
7982 		next = TAILQ_FIRST(&s->refs);
7983 
7984 	last = s->last_displayed_entry;
7985 	while (next && n++ < maxscroll) {
7986 		if (last) {
7987 			s->last_displayed_entry = last;
7988 			last = TAILQ_NEXT(last, entry);
7989 		}
7990 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7991 			s->first_displayed_entry = next;
7992 			next = TAILQ_NEXT(next, entry);
7993 		}
7994 	}
7995 
7996 	return NULL;
7997 }
7998 
7999 static const struct got_error *
8000 search_start_ref_view(struct tog_view *view)
8001 {
8002 	struct tog_ref_view_state *s = &view->state.ref;
8003 
8004 	s->matched_entry = NULL;
8005 	return NULL;
8006 }
8007 
8008 static int
8009 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8010 {
8011 	regmatch_t regmatch;
8012 
8013 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8014 	    0) == 0;
8015 }
8016 
8017 static const struct got_error *
8018 search_next_ref_view(struct tog_view *view)
8019 {
8020 	struct tog_ref_view_state *s = &view->state.ref;
8021 	struct tog_reflist_entry *re = NULL;
8022 
8023 	if (!view->searching) {
8024 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8025 		return NULL;
8026 	}
8027 
8028 	if (s->matched_entry) {
8029 		if (view->searching == TOG_SEARCH_FORWARD) {
8030 			if (s->selected_entry)
8031 				re = TAILQ_NEXT(s->selected_entry, entry);
8032 			else
8033 				re = TAILQ_PREV(s->selected_entry,
8034 				    tog_reflist_head, entry);
8035 		} else {
8036 			if (s->selected_entry == NULL)
8037 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8038 			else
8039 				re = TAILQ_PREV(s->selected_entry,
8040 				    tog_reflist_head, entry);
8041 		}
8042 	} else {
8043 		if (s->selected_entry)
8044 			re = s->selected_entry;
8045 		else if (view->searching == TOG_SEARCH_FORWARD)
8046 			re = TAILQ_FIRST(&s->refs);
8047 		else
8048 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8049 	}
8050 
8051 	while (1) {
8052 		if (re == NULL) {
8053 			if (s->matched_entry == NULL) {
8054 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8055 				return NULL;
8056 			}
8057 			if (view->searching == TOG_SEARCH_FORWARD)
8058 				re = TAILQ_FIRST(&s->refs);
8059 			else
8060 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8061 		}
8062 
8063 		if (match_reflist_entry(re, &view->regex)) {
8064 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8065 			s->matched_entry = re;
8066 			break;
8067 		}
8068 
8069 		if (view->searching == TOG_SEARCH_FORWARD)
8070 			re = TAILQ_NEXT(re, entry);
8071 		else
8072 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8073 	}
8074 
8075 	if (s->matched_entry) {
8076 		s->first_displayed_entry = s->matched_entry;
8077 		s->selected = 0;
8078 	}
8079 
8080 	return NULL;
8081 }
8082 
8083 static const struct got_error *
8084 show_ref_view(struct tog_view *view)
8085 {
8086 	const struct got_error *err = NULL;
8087 	struct tog_ref_view_state *s = &view->state.ref;
8088 	struct tog_reflist_entry *re;
8089 	char *line = NULL;
8090 	wchar_t *wline;
8091 	struct tog_color *tc;
8092 	int width, n, scrollx;
8093 	int limit = view->nlines;
8094 
8095 	werase(view->window);
8096 
8097 	s->ndisplayed = 0;
8098 	if (view_is_hsplit_top(view))
8099 		--limit;  /* border */
8100 
8101 	if (limit == 0)
8102 		return NULL;
8103 
8104 	re = s->first_displayed_entry;
8105 
8106 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8107 	    s->nrefs) == -1)
8108 		return got_error_from_errno("asprintf");
8109 
8110 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8111 	if (err) {
8112 		free(line);
8113 		return err;
8114 	}
8115 	if (view_needs_focus_indication(view))
8116 		wstandout(view->window);
8117 	waddwstr(view->window, wline);
8118 	while (width++ < view->ncols)
8119 		waddch(view->window, ' ');
8120 	if (view_needs_focus_indication(view))
8121 		wstandend(view->window);
8122 	free(wline);
8123 	wline = NULL;
8124 	free(line);
8125 	line = NULL;
8126 	if (--limit <= 0)
8127 		return NULL;
8128 
8129 	n = 0;
8130 	view->maxx = 0;
8131 	while (re && limit > 0) {
8132 		char *line = NULL;
8133 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8134 
8135 		if (s->show_date) {
8136 			struct got_commit_object *ci;
8137 			struct got_tag_object *tag;
8138 			struct got_object_id *id;
8139 			struct tm tm;
8140 			time_t t;
8141 
8142 			err = got_ref_resolve(&id, s->repo, re->ref);
8143 			if (err)
8144 				return err;
8145 			err = got_object_open_as_tag(&tag, s->repo, id);
8146 			if (err) {
8147 				if (err->code != GOT_ERR_OBJ_TYPE) {
8148 					free(id);
8149 					return err;
8150 				}
8151 				err = got_object_open_as_commit(&ci, s->repo,
8152 				    id);
8153 				if (err) {
8154 					free(id);
8155 					return err;
8156 				}
8157 				t = got_object_commit_get_committer_time(ci);
8158 				got_object_commit_close(ci);
8159 			} else {
8160 				t = got_object_tag_get_tagger_time(tag);
8161 				got_object_tag_close(tag);
8162 			}
8163 			free(id);
8164 			if (gmtime_r(&t, &tm) == NULL)
8165 				return got_error_from_errno("gmtime_r");
8166 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8167 				return got_error(GOT_ERR_NO_SPACE);
8168 		}
8169 		if (got_ref_is_symbolic(re->ref)) {
8170 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8171 			    ymd : "", got_ref_get_name(re->ref),
8172 			    got_ref_get_symref_target(re->ref)) == -1)
8173 				return got_error_from_errno("asprintf");
8174 		} else if (s->show_ids) {
8175 			struct got_object_id *id;
8176 			char *id_str;
8177 			err = got_ref_resolve(&id, s->repo, re->ref);
8178 			if (err)
8179 				return err;
8180 			err = got_object_id_str(&id_str, id);
8181 			if (err) {
8182 				free(id);
8183 				return err;
8184 			}
8185 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8186 			    got_ref_get_name(re->ref), id_str) == -1) {
8187 				err = got_error_from_errno("asprintf");
8188 				free(id);
8189 				free(id_str);
8190 				return err;
8191 			}
8192 			free(id);
8193 			free(id_str);
8194 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8195 		    got_ref_get_name(re->ref)) == -1)
8196 			return got_error_from_errno("asprintf");
8197 
8198 		/* use full line width to determine view->maxx */
8199 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8200 		if (err) {
8201 			free(line);
8202 			return err;
8203 		}
8204 		view->maxx = MAX(view->maxx, width);
8205 		free(wline);
8206 		wline = NULL;
8207 
8208 		err = format_line(&wline, &width, &scrollx, line, view->x,
8209 		    view->ncols, 0, 0);
8210 		if (err) {
8211 			free(line);
8212 			return err;
8213 		}
8214 		if (n == s->selected) {
8215 			if (view->focussed)
8216 				wstandout(view->window);
8217 			s->selected_entry = re;
8218 		}
8219 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8220 		if (tc)
8221 			wattr_on(view->window,
8222 			    COLOR_PAIR(tc->colorpair), NULL);
8223 		waddwstr(view->window, &wline[scrollx]);
8224 		if (tc)
8225 			wattr_off(view->window,
8226 			    COLOR_PAIR(tc->colorpair), NULL);
8227 		if (width < view->ncols)
8228 			waddch(view->window, '\n');
8229 		if (n == s->selected && view->focussed)
8230 			wstandend(view->window);
8231 		free(line);
8232 		free(wline);
8233 		wline = NULL;
8234 		n++;
8235 		s->ndisplayed++;
8236 		s->last_displayed_entry = re;
8237 
8238 		limit--;
8239 		re = TAILQ_NEXT(re, entry);
8240 	}
8241 
8242 	view_border(view);
8243 	return err;
8244 }
8245 
8246 static const struct got_error *
8247 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8248     struct tog_reflist_entry *re, struct got_repository *repo)
8249 {
8250 	const struct got_error *err = NULL;
8251 	struct got_object_id *commit_id = NULL;
8252 	struct tog_view *tree_view;
8253 
8254 	*new_view = NULL;
8255 
8256 	err = resolve_reflist_entry(&commit_id, re, repo);
8257 	if (err) {
8258 		if (err->code != GOT_ERR_OBJ_TYPE)
8259 			return err;
8260 		else
8261 			return NULL;
8262 	}
8263 
8264 
8265 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8266 	if (tree_view == NULL) {
8267 		err = got_error_from_errno("view_open");
8268 		goto done;
8269 	}
8270 
8271 	err = open_tree_view(tree_view, commit_id,
8272 	    got_ref_get_name(re->ref), repo);
8273 	if (err)
8274 		goto done;
8275 
8276 	*new_view = tree_view;
8277 done:
8278 	free(commit_id);
8279 	return err;
8280 }
8281 
8282 static const struct got_error *
8283 ref_goto_line(struct tog_view *view, int nlines)
8284 {
8285 	const struct got_error		*err = NULL;
8286 	struct tog_ref_view_state	*s = &view->state.ref;
8287 	int				 g, idx = s->selected_entry->idx;
8288 
8289 	g = view->gline;
8290 	view->gline = 0;
8291 
8292 	if (g == 0)
8293 		g = 1;
8294 	else if (g > s->nrefs)
8295 		g = s->nrefs;
8296 
8297 	if (g >= s->first_displayed_entry->idx + 1 &&
8298 	    g <= s->last_displayed_entry->idx + 1 &&
8299 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8300 		s->selected = g - s->first_displayed_entry->idx - 1;
8301 		return NULL;
8302 	}
8303 
8304 	if (idx + 1 < g) {
8305 		err = ref_scroll_down(view, g - idx - 1);
8306 		if (err)
8307 			return err;
8308 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8309 		    s->first_displayed_entry->idx + s->selected < g &&
8310 		    s->selected < s->ndisplayed - 1)
8311 			s->selected = g - s->first_displayed_entry->idx - 1;
8312 	} else if (idx + 1 > g)
8313 		ref_scroll_up(s, idx - g + 1);
8314 
8315 	if (g < nlines && s->first_displayed_entry->idx == 0)
8316 		s->selected = g - 1;
8317 
8318 	return NULL;
8319 
8320 }
8321 
8322 static const struct got_error *
8323 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8324 {
8325 	const struct got_error *err = NULL;
8326 	struct tog_ref_view_state *s = &view->state.ref;
8327 	struct tog_reflist_entry *re;
8328 	int n, nscroll = view->nlines - 1;
8329 
8330 	if (view->gline)
8331 		return ref_goto_line(view, nscroll);
8332 
8333 	switch (ch) {
8334 	case '0':
8335 	case '$':
8336 	case KEY_RIGHT:
8337 	case 'l':
8338 	case KEY_LEFT:
8339 	case 'h':
8340 		horizontal_scroll_input(view, ch);
8341 		break;
8342 	case 'i':
8343 		s->show_ids = !s->show_ids;
8344 		view->count = 0;
8345 		break;
8346 	case 'm':
8347 		s->show_date = !s->show_date;
8348 		view->count = 0;
8349 		break;
8350 	case 'o':
8351 		s->sort_by_date = !s->sort_by_date;
8352 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8353 		view->count = 0;
8354 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8355 		    got_ref_cmp_by_commit_timestamp_descending :
8356 		    tog_ref_cmp_by_name, s->repo);
8357 		if (err)
8358 			break;
8359 		got_reflist_object_id_map_free(tog_refs_idmap);
8360 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8361 		    &tog_refs, s->repo);
8362 		if (err)
8363 			break;
8364 		ref_view_free_refs(s);
8365 		err = ref_view_load_refs(s);
8366 		break;
8367 	case KEY_ENTER:
8368 	case '\r':
8369 		view->count = 0;
8370 		if (!s->selected_entry)
8371 			break;
8372 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8373 		break;
8374 	case 'T':
8375 		view->count = 0;
8376 		if (!s->selected_entry)
8377 			break;
8378 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8379 		break;
8380 	case 'g':
8381 	case '=':
8382 	case KEY_HOME:
8383 		s->selected = 0;
8384 		view->count = 0;
8385 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8386 		break;
8387 	case 'G':
8388 	case '*':
8389 	case KEY_END: {
8390 		int eos = view->nlines - 1;
8391 
8392 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8393 			--eos;  /* border */
8394 		s->selected = 0;
8395 		view->count = 0;
8396 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8397 		for (n = 0; n < eos; n++) {
8398 			if (re == NULL)
8399 				break;
8400 			s->first_displayed_entry = re;
8401 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8402 		}
8403 		if (n > 0)
8404 			s->selected = n - 1;
8405 		break;
8406 	}
8407 	case 'k':
8408 	case KEY_UP:
8409 	case CTRL('p'):
8410 		if (s->selected > 0) {
8411 			s->selected--;
8412 			break;
8413 		}
8414 		ref_scroll_up(s, 1);
8415 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8416 			view->count = 0;
8417 		break;
8418 	case CTRL('u'):
8419 	case 'u':
8420 		nscroll /= 2;
8421 		/* FALL THROUGH */
8422 	case KEY_PPAGE:
8423 	case CTRL('b'):
8424 	case 'b':
8425 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8426 			s->selected -= MIN(nscroll, s->selected);
8427 		ref_scroll_up(s, MAX(0, nscroll));
8428 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8429 			view->count = 0;
8430 		break;
8431 	case 'j':
8432 	case KEY_DOWN:
8433 	case CTRL('n'):
8434 		if (s->selected < s->ndisplayed - 1) {
8435 			s->selected++;
8436 			break;
8437 		}
8438 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8439 			/* can't scroll any further */
8440 			view->count = 0;
8441 			break;
8442 		}
8443 		ref_scroll_down(view, 1);
8444 		break;
8445 	case CTRL('d'):
8446 	case 'd':
8447 		nscroll /= 2;
8448 		/* FALL THROUGH */
8449 	case KEY_NPAGE:
8450 	case CTRL('f'):
8451 	case 'f':
8452 	case ' ':
8453 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8454 			/* can't scroll any further; move cursor down */
8455 			if (s->selected < s->ndisplayed - 1)
8456 				s->selected += MIN(nscroll,
8457 				    s->ndisplayed - s->selected - 1);
8458 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8459 				s->selected += s->ndisplayed - s->selected - 1;
8460 			view->count = 0;
8461 			break;
8462 		}
8463 		ref_scroll_down(view, nscroll);
8464 		break;
8465 	case CTRL('l'):
8466 		view->count = 0;
8467 		tog_free_refs();
8468 		err = tog_load_refs(s->repo, s->sort_by_date);
8469 		if (err)
8470 			break;
8471 		ref_view_free_refs(s);
8472 		err = ref_view_load_refs(s);
8473 		break;
8474 	case KEY_RESIZE:
8475 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8476 			s->selected = view->nlines - 2;
8477 		break;
8478 	default:
8479 		view->count = 0;
8480 		break;
8481 	}
8482 
8483 	return err;
8484 }
8485 
8486 __dead static void
8487 usage_ref(void)
8488 {
8489 	endwin();
8490 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8491 	    getprogname());
8492 	exit(1);
8493 }
8494 
8495 static const struct got_error *
8496 cmd_ref(int argc, char *argv[])
8497 {
8498 	const struct got_error *error;
8499 	struct got_repository *repo = NULL;
8500 	struct got_worktree *worktree = NULL;
8501 	char *cwd = NULL, *repo_path = NULL;
8502 	int ch;
8503 	struct tog_view *view;
8504 	int *pack_fds = NULL;
8505 
8506 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8507 		switch (ch) {
8508 		case 'r':
8509 			repo_path = realpath(optarg, NULL);
8510 			if (repo_path == NULL)
8511 				return got_error_from_errno2("realpath",
8512 				    optarg);
8513 			break;
8514 		default:
8515 			usage_ref();
8516 			/* NOTREACHED */
8517 		}
8518 	}
8519 
8520 	argc -= optind;
8521 	argv += optind;
8522 
8523 	if (argc > 1)
8524 		usage_ref();
8525 
8526 	error = got_repo_pack_fds_open(&pack_fds);
8527 	if (error != NULL)
8528 		goto done;
8529 
8530 	if (repo_path == NULL) {
8531 		cwd = getcwd(NULL, 0);
8532 		if (cwd == NULL)
8533 			return got_error_from_errno("getcwd");
8534 		error = got_worktree_open(&worktree, cwd);
8535 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8536 			goto done;
8537 		if (worktree)
8538 			repo_path =
8539 			    strdup(got_worktree_get_repo_path(worktree));
8540 		else
8541 			repo_path = strdup(cwd);
8542 		if (repo_path == NULL) {
8543 			error = got_error_from_errno("strdup");
8544 			goto done;
8545 		}
8546 	}
8547 
8548 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8549 	if (error != NULL)
8550 		goto done;
8551 
8552 	init_curses();
8553 
8554 	error = apply_unveil(got_repo_get_path(repo), NULL);
8555 	if (error)
8556 		goto done;
8557 
8558 	error = tog_load_refs(repo, 0);
8559 	if (error)
8560 		goto done;
8561 
8562 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8563 	if (view == NULL) {
8564 		error = got_error_from_errno("view_open");
8565 		goto done;
8566 	}
8567 
8568 	error = open_ref_view(view, repo);
8569 	if (error)
8570 		goto done;
8571 
8572 	if (worktree) {
8573 		/* Release work tree lock. */
8574 		got_worktree_close(worktree);
8575 		worktree = NULL;
8576 	}
8577 	error = view_loop(view);
8578 done:
8579 	free(repo_path);
8580 	free(cwd);
8581 	if (repo) {
8582 		const struct got_error *close_err = got_repo_close(repo);
8583 		if (close_err)
8584 			error = close_err;
8585 	}
8586 	if (pack_fds) {
8587 		const struct got_error *pack_err =
8588 		    got_repo_pack_fds_close(pack_fds);
8589 		if (error == NULL)
8590 			error = pack_err;
8591 	}
8592 	tog_free_refs();
8593 	return error;
8594 }
8595 
8596 static const struct got_error*
8597 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8598     const char *str)
8599 {
8600 	size_t len;
8601 
8602 	if (win == NULL)
8603 		win = stdscr;
8604 
8605 	len = strlen(str);
8606 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8607 
8608 	if (focus)
8609 		wstandout(win);
8610 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8611 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8612 	if (focus)
8613 		wstandend(win);
8614 
8615 	return NULL;
8616 }
8617 
8618 static const struct got_error *
8619 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8620 {
8621 	off_t *p;
8622 
8623 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8624 	if (p == NULL) {
8625 		free(*line_offsets);
8626 		*line_offsets = NULL;
8627 		return got_error_from_errno("reallocarray");
8628 	}
8629 
8630 	*line_offsets = p;
8631 	(*line_offsets)[*nlines] = off;
8632 	++(*nlines);
8633 	return NULL;
8634 }
8635 
8636 static const struct got_error *
8637 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8638 {
8639 	*ret = 0;
8640 
8641 	for (;n > 0; --n, ++km) {
8642 		char	*t0, *t, *k;
8643 		size_t	 len = 1;
8644 
8645 		if (km->keys == NULL)
8646 			continue;
8647 
8648 		t = t0 = strdup(km->keys);
8649 		if (t0 == NULL)
8650 			return got_error_from_errno("strdup");
8651 
8652 		len += strlen(t);
8653 		while ((k = strsep(&t, " ")) != NULL)
8654 			len += strlen(k) > 1 ? 2 : 0;
8655 		free(t0);
8656 		*ret = MAX(*ret, len);
8657 	}
8658 
8659 	return NULL;
8660 }
8661 
8662 /*
8663  * Write keymap section headers, keys, and key info in km to f.
8664  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8665  * wrap control and symbolic keys in guillemets, else use <>.
8666  */
8667 static const struct got_error *
8668 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8669 {
8670 	int n, len = width;
8671 
8672 	if (km->keys) {
8673 		static const char *u8_glyph[] = {
8674 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8675 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8676 		};
8677 		char	*t0, *t, *k;
8678 		int	 cs, s, first = 1;
8679 
8680 		cs = got_locale_is_utf8();
8681 
8682 		t = t0 = strdup(km->keys);
8683 		if (t0 == NULL)
8684 			return got_error_from_errno("strdup");
8685 
8686 		len = strlen(km->keys);
8687 		while ((k = strsep(&t, " ")) != NULL) {
8688 			s = strlen(k) > 1;  /* control or symbolic key */
8689 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8690 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8691 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8692 			if (n < 0) {
8693 				free(t0);
8694 				return got_error_from_errno("fprintf");
8695 			}
8696 			first = 0;
8697 			len += s ? 2 : 0;
8698 			*off += n;
8699 		}
8700 		free(t0);
8701 	}
8702 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8703 	if (n < 0)
8704 		return got_error_from_errno("fprintf");
8705 	*off += n;
8706 
8707 	return NULL;
8708 }
8709 
8710 static const struct got_error *
8711 format_help(struct tog_help_view_state *s)
8712 {
8713 	const struct got_error		*err = NULL;
8714 	off_t				 off = 0;
8715 	int				 i, max, n, show = s->all;
8716 	static const struct tog_key_map	 km[] = {
8717 #define KEYMAP_(info, type)	{ NULL, (info), type }
8718 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8719 		GENERATE_HELP
8720 #undef KEYMAP_
8721 #undef KEY_
8722 	};
8723 
8724 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8725 	if (err)
8726 		return err;
8727 
8728 	n = nitems(km);
8729 	err = max_key_str(&max, km, n);
8730 	if (err)
8731 		return err;
8732 
8733 	for (i = 0; i < n; ++i) {
8734 		if (km[i].keys == NULL) {
8735 			show = s->all;
8736 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8737 			    km[i].type == s->type || s->all)
8738 				show = 1;
8739 		}
8740 		if (show) {
8741 			err = format_help_line(&off, s->f, &km[i], max);
8742 			if (err)
8743 				return err;
8744 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8745 			if (err)
8746 				return err;
8747 		}
8748 	}
8749 	fputc('\n', s->f);
8750 	++off;
8751 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8752 	return err;
8753 }
8754 
8755 static const struct got_error *
8756 create_help(struct tog_help_view_state *s)
8757 {
8758 	FILE			*f;
8759 	const struct got_error	*err;
8760 
8761 	free(s->line_offsets);
8762 	s->line_offsets = NULL;
8763 	s->nlines = 0;
8764 
8765 	f = got_opentemp();
8766 	if (f == NULL)
8767 		return got_error_from_errno("got_opentemp");
8768 	s->f = f;
8769 
8770 	err = format_help(s);
8771 	if (err)
8772 		return err;
8773 
8774 	if (s->f && fflush(s->f) != 0)
8775 		return got_error_from_errno("fflush");
8776 
8777 	return NULL;
8778 }
8779 
8780 static const struct got_error *
8781 search_start_help_view(struct tog_view *view)
8782 {
8783 	view->state.help.matched_line = 0;
8784 	return NULL;
8785 }
8786 
8787 static void
8788 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8789     size_t *nlines, int **first, int **last, int **match, int **selected)
8790 {
8791 	struct tog_help_view_state *s = &view->state.help;
8792 
8793 	*f = s->f;
8794 	*nlines = s->nlines;
8795 	*line_offsets = s->line_offsets;
8796 	*match = &s->matched_line;
8797 	*first = &s->first_displayed_line;
8798 	*last = &s->last_displayed_line;
8799 	*selected = &s->selected_line;
8800 }
8801 
8802 static const struct got_error *
8803 show_help_view(struct tog_view *view)
8804 {
8805 	struct tog_help_view_state	*s = &view->state.help;
8806 	const struct got_error		*err;
8807 	regmatch_t			*regmatch = &view->regmatch;
8808 	wchar_t				*wline;
8809 	char				*line;
8810 	ssize_t				 linelen;
8811 	size_t				 linesz = 0;
8812 	int				 width, nprinted = 0, rc = 0;
8813 	int				 eos = view->nlines;
8814 
8815 	if (view_is_hsplit_top(view))
8816 		--eos;  /* account for border */
8817 
8818 	s->lineno = 0;
8819 	rewind(s->f);
8820 	werase(view->window);
8821 
8822 	if (view->gline > s->nlines - 1)
8823 		view->gline = s->nlines - 1;
8824 
8825 	err = win_draw_center(view->window, 0, 0, view->ncols,
8826 	    view_needs_focus_indication(view),
8827 	    "tog help (press q to return to tog)");
8828 	if (err)
8829 		return err;
8830 	if (eos <= 1)
8831 		return NULL;
8832 	waddstr(view->window, "\n\n");
8833 	eos -= 2;
8834 
8835 	s->eof = 0;
8836 	view->maxx = 0;
8837 	line = NULL;
8838 	while (eos > 0 && nprinted < eos) {
8839 		attr_t attr = 0;
8840 
8841 		linelen = getline(&line, &linesz, s->f);
8842 		if (linelen == -1) {
8843 			if (!feof(s->f)) {
8844 				free(line);
8845 				return got_ferror(s->f, GOT_ERR_IO);
8846 			}
8847 			s->eof = 1;
8848 			break;
8849 		}
8850 		if (++s->lineno < s->first_displayed_line)
8851 			continue;
8852 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8853 			continue;
8854 		if (s->lineno == view->hiline)
8855 			attr = A_STANDOUT;
8856 
8857 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8858 		    view->x ? 1 : 0);
8859 		if (err) {
8860 			free(line);
8861 			return err;
8862 		}
8863 		view->maxx = MAX(view->maxx, width);
8864 		free(wline);
8865 		wline = NULL;
8866 
8867 		if (attr)
8868 			wattron(view->window, attr);
8869 		if (s->first_displayed_line + nprinted == s->matched_line &&
8870 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8871 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8872 			    view->window, view->x, regmatch);
8873 			if (err) {
8874 				free(line);
8875 				return err;
8876 			}
8877 		} else {
8878 			int skip;
8879 
8880 			err = format_line(&wline, &width, &skip, line,
8881 			    view->x, view->ncols, 0, view->x ? 1 : 0);
8882 			if (err) {
8883 				free(line);
8884 				return err;
8885 			}
8886 			waddwstr(view->window, &wline[skip]);
8887 			free(wline);
8888 			wline = NULL;
8889 		}
8890 		if (s->lineno == view->hiline) {
8891 			while (width++ < view->ncols)
8892 				waddch(view->window, ' ');
8893 		} else {
8894 			if (width < view->ncols)
8895 				waddch(view->window, '\n');
8896 		}
8897 		if (attr)
8898 			wattroff(view->window, attr);
8899 		if (++nprinted == 1)
8900 			s->first_displayed_line = s->lineno;
8901 	}
8902 	free(line);
8903 	if (nprinted > 0)
8904 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8905 	else
8906 		s->last_displayed_line = s->first_displayed_line;
8907 
8908 	view_border(view);
8909 
8910 	if (s->eof) {
8911 		rc = waddnstr(view->window,
8912 		    "See the tog(1) manual page for full documentation",
8913 		    view->ncols - 1);
8914 		if (rc == ERR)
8915 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8916 	} else {
8917 		wmove(view->window, view->nlines - 1, 0);
8918 		wclrtoeol(view->window);
8919 		wstandout(view->window);
8920 		rc = waddnstr(view->window, "scroll down for more...",
8921 		    view->ncols - 1);
8922 		if (rc == ERR)
8923 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8924 		if (getcurx(view->window) < view->ncols - 6) {
8925 			rc = wprintw(view->window, "[%.0f%%]",
8926 			    100.00 * s->last_displayed_line / s->nlines);
8927 			if (rc == ERR)
8928 				return got_error_msg(GOT_ERR_IO, "wprintw");
8929 		}
8930 		wstandend(view->window);
8931 	}
8932 
8933 	return NULL;
8934 }
8935 
8936 static const struct got_error *
8937 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8938 {
8939 	struct tog_help_view_state	*s = &view->state.help;
8940 	const struct got_error		*err = NULL;
8941 	char				*line = NULL;
8942 	ssize_t				 linelen;
8943 	size_t				 linesz = 0;
8944 	int				 eos, nscroll;
8945 
8946 	eos = nscroll = view->nlines;
8947 	if (view_is_hsplit_top(view))
8948 		--eos;  /* border */
8949 
8950 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8951 
8952 	switch (ch) {
8953 	case '0':
8954 	case '$':
8955 	case KEY_RIGHT:
8956 	case 'l':
8957 	case KEY_LEFT:
8958 	case 'h':
8959 		horizontal_scroll_input(view, ch);
8960 		break;
8961 	case 'g':
8962 	case KEY_HOME:
8963 		s->first_displayed_line = 1;
8964 		view->count = 0;
8965 		break;
8966 	case 'G':
8967 	case KEY_END:
8968 		view->count = 0;
8969 		if (s->eof)
8970 			break;
8971 		s->first_displayed_line = (s->nlines - eos) + 3;
8972 		s->eof = 1;
8973 		break;
8974 	case 'k':
8975 	case KEY_UP:
8976 		if (s->first_displayed_line > 1)
8977 			--s->first_displayed_line;
8978 		else
8979 			view->count = 0;
8980 		break;
8981 	case CTRL('u'):
8982 	case 'u':
8983 		nscroll /= 2;
8984 		/* FALL THROUGH */
8985 	case KEY_PPAGE:
8986 	case CTRL('b'):
8987 	case 'b':
8988 		if (s->first_displayed_line == 1) {
8989 			view->count = 0;
8990 			break;
8991 		}
8992 		while (--nscroll > 0 && s->first_displayed_line > 1)
8993 			s->first_displayed_line--;
8994 		break;
8995 	case 'j':
8996 	case KEY_DOWN:
8997 	case CTRL('n'):
8998 		if (!s->eof)
8999 			++s->first_displayed_line;
9000 		else
9001 			view->count = 0;
9002 		break;
9003 	case CTRL('d'):
9004 	case 'd':
9005 		nscroll /= 2;
9006 		/* FALL THROUGH */
9007 	case KEY_NPAGE:
9008 	case CTRL('f'):
9009 	case 'f':
9010 	case ' ':
9011 		if (s->eof) {
9012 			view->count = 0;
9013 			break;
9014 		}
9015 		while (!s->eof && --nscroll > 0) {
9016 			linelen = getline(&line, &linesz, s->f);
9017 			s->first_displayed_line++;
9018 			if (linelen == -1) {
9019 				if (feof(s->f))
9020 					s->eof = 1;
9021 				else
9022 					err = got_ferror(s->f, GOT_ERR_IO);
9023 				break;
9024 			}
9025 		}
9026 		free(line);
9027 		break;
9028 	default:
9029 		view->count = 0;
9030 		break;
9031 	}
9032 
9033 	return err;
9034 }
9035 
9036 static const struct got_error *
9037 close_help_view(struct tog_view *view)
9038 {
9039 	struct tog_help_view_state *s = &view->state.help;
9040 
9041 	free(s->line_offsets);
9042 	s->line_offsets = NULL;
9043 	if (fclose(s->f) == EOF)
9044 		return got_error_from_errno("fclose");
9045 
9046 	return NULL;
9047 }
9048 
9049 static const struct got_error *
9050 reset_help_view(struct tog_view *view)
9051 {
9052 	struct tog_help_view_state *s = &view->state.help;
9053 
9054 
9055 	if (s->f && fclose(s->f) == EOF)
9056 		return got_error_from_errno("fclose");
9057 
9058 	wclear(view->window);
9059 	view->count = 0;
9060 	view->x = 0;
9061 	s->all = !s->all;
9062 	s->first_displayed_line = 1;
9063 	s->last_displayed_line = view->nlines;
9064 	s->matched_line = 0;
9065 
9066 	return create_help(s);
9067 }
9068 
9069 static const struct got_error *
9070 open_help_view(struct tog_view *view, struct tog_view *parent)
9071 {
9072 	const struct got_error		*err = NULL;
9073 	struct tog_help_view_state	*s = &view->state.help;
9074 
9075 	s->type = (enum tog_keymap_type)parent->type;
9076 	s->first_displayed_line = 1;
9077 	s->last_displayed_line = view->nlines;
9078 	s->selected_line = 1;
9079 
9080 	view->show = show_help_view;
9081 	view->input = input_help_view;
9082 	view->reset = reset_help_view;
9083 	view->close = close_help_view;
9084 	view->search_start = search_start_help_view;
9085 	view->search_setup = search_setup_help_view;
9086 	view->search_next = search_next_view_match;
9087 
9088 	err = create_help(s);
9089 	return err;
9090 }
9091 
9092 static const struct got_error *
9093 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9094     enum tog_view_type request, int y, int x)
9095 {
9096 	const struct got_error *err = NULL;
9097 
9098 	*new_view = NULL;
9099 
9100 	switch (request) {
9101 	case TOG_VIEW_DIFF:
9102 		if (view->type == TOG_VIEW_LOG) {
9103 			struct tog_log_view_state *s = &view->state.log;
9104 
9105 			err = open_diff_view_for_commit(new_view, y, x,
9106 			    s->selected_entry->commit, s->selected_entry->id,
9107 			    view, s->repo);
9108 		} else
9109 			return got_error_msg(GOT_ERR_NOT_IMPL,
9110 			    "parent/child view pair not supported");
9111 		break;
9112 	case TOG_VIEW_BLAME:
9113 		if (view->type == TOG_VIEW_TREE) {
9114 			struct tog_tree_view_state *s = &view->state.tree;
9115 
9116 			err = blame_tree_entry(new_view, y, x,
9117 			    s->selected_entry, &s->parents, s->commit_id,
9118 			    s->repo);
9119 		} else
9120 			return got_error_msg(GOT_ERR_NOT_IMPL,
9121 			    "parent/child view pair not supported");
9122 		break;
9123 	case TOG_VIEW_LOG:
9124 		if (view->type == TOG_VIEW_BLAME)
9125 			err = log_annotated_line(new_view, y, x,
9126 			    view->state.blame.repo, view->state.blame.id_to_log);
9127 		else if (view->type == TOG_VIEW_TREE)
9128 			err = log_selected_tree_entry(new_view, y, x,
9129 			    &view->state.tree);
9130 		else if (view->type == TOG_VIEW_REF)
9131 			err = log_ref_entry(new_view, y, x,
9132 			    view->state.ref.selected_entry,
9133 			    view->state.ref.repo);
9134 		else
9135 			return got_error_msg(GOT_ERR_NOT_IMPL,
9136 			    "parent/child view pair not supported");
9137 		break;
9138 	case TOG_VIEW_TREE:
9139 		if (view->type == TOG_VIEW_LOG)
9140 			err = browse_commit_tree(new_view, y, x,
9141 			    view->state.log.selected_entry,
9142 			    view->state.log.in_repo_path,
9143 			    view->state.log.head_ref_name,
9144 			    view->state.log.repo);
9145 		else if (view->type == TOG_VIEW_REF)
9146 			err = browse_ref_tree(new_view, y, x,
9147 			    view->state.ref.selected_entry,
9148 			    view->state.ref.repo);
9149 		else
9150 			return got_error_msg(GOT_ERR_NOT_IMPL,
9151 			    "parent/child view pair not supported");
9152 		break;
9153 	case TOG_VIEW_REF:
9154 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9155 		if (*new_view == NULL)
9156 			return got_error_from_errno("view_open");
9157 		if (view->type == TOG_VIEW_LOG)
9158 			err = open_ref_view(*new_view, view->state.log.repo);
9159 		else if (view->type == TOG_VIEW_TREE)
9160 			err = open_ref_view(*new_view, view->state.tree.repo);
9161 		else
9162 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9163 			    "parent/child view pair not supported");
9164 		if (err)
9165 			view_close(*new_view);
9166 		break;
9167 	case TOG_VIEW_HELP:
9168 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9169 		if (*new_view == NULL)
9170 			return got_error_from_errno("view_open");
9171 		err = open_help_view(*new_view, view);
9172 		if (err)
9173 			view_close(*new_view);
9174 		break;
9175 	default:
9176 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9177 	}
9178 
9179 	return err;
9180 }
9181 
9182 /*
9183  * If view was scrolled down to move the selected line into view when opening a
9184  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9185  */
9186 static void
9187 offset_selection_up(struct tog_view *view)
9188 {
9189 	switch (view->type) {
9190 	case TOG_VIEW_BLAME: {
9191 		struct tog_blame_view_state *s = &view->state.blame;
9192 		if (s->first_displayed_line == 1) {
9193 			s->selected_line = MAX(s->selected_line - view->offset,
9194 			    1);
9195 			break;
9196 		}
9197 		if (s->first_displayed_line > view->offset)
9198 			s->first_displayed_line -= view->offset;
9199 		else
9200 			s->first_displayed_line = 1;
9201 		s->selected_line += view->offset;
9202 		break;
9203 	}
9204 	case TOG_VIEW_LOG:
9205 		log_scroll_up(&view->state.log, view->offset);
9206 		view->state.log.selected += view->offset;
9207 		break;
9208 	case TOG_VIEW_REF:
9209 		ref_scroll_up(&view->state.ref, view->offset);
9210 		view->state.ref.selected += view->offset;
9211 		break;
9212 	case TOG_VIEW_TREE:
9213 		tree_scroll_up(&view->state.tree, view->offset);
9214 		view->state.tree.selected += view->offset;
9215 		break;
9216 	default:
9217 		break;
9218 	}
9219 
9220 	view->offset = 0;
9221 }
9222 
9223 /*
9224  * If the selected line is in the section of screen covered by the bottom split,
9225  * scroll down offset lines to move it into view and index its new position.
9226  */
9227 static const struct got_error *
9228 offset_selection_down(struct tog_view *view)
9229 {
9230 	const struct got_error	*err = NULL;
9231 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9232 	int			*selected = NULL;
9233 	int			 header, offset;
9234 
9235 	switch (view->type) {
9236 	case TOG_VIEW_BLAME: {
9237 		struct tog_blame_view_state *s = &view->state.blame;
9238 		header = 3;
9239 		scrolld = NULL;
9240 		if (s->selected_line > view->nlines - header) {
9241 			offset = abs(view->nlines - s->selected_line - header);
9242 			s->first_displayed_line += offset;
9243 			s->selected_line -= offset;
9244 			view->offset = offset;
9245 		}
9246 		break;
9247 	}
9248 	case TOG_VIEW_LOG: {
9249 		struct tog_log_view_state *s = &view->state.log;
9250 		scrolld = &log_scroll_down;
9251 		header = view_is_parent_view(view) ? 3 : 2;
9252 		selected = &s->selected;
9253 		break;
9254 	}
9255 	case TOG_VIEW_REF: {
9256 		struct tog_ref_view_state *s = &view->state.ref;
9257 		scrolld = &ref_scroll_down;
9258 		header = 3;
9259 		selected = &s->selected;
9260 		break;
9261 	}
9262 	case TOG_VIEW_TREE: {
9263 		struct tog_tree_view_state *s = &view->state.tree;
9264 		scrolld = &tree_scroll_down;
9265 		header = 5;
9266 		selected = &s->selected;
9267 		break;
9268 	}
9269 	default:
9270 		selected = NULL;
9271 		scrolld = NULL;
9272 		header = 0;
9273 		break;
9274 	}
9275 
9276 	if (selected && *selected > view->nlines - header) {
9277 		offset = abs(view->nlines - *selected - header);
9278 		view->offset = offset;
9279 		if (scrolld && offset) {
9280 			err = scrolld(view, offset);
9281 			*selected -= offset;
9282 		}
9283 	}
9284 
9285 	return err;
9286 }
9287 
9288 static void
9289 list_commands(FILE *fp)
9290 {
9291 	size_t i;
9292 
9293 	fprintf(fp, "commands:");
9294 	for (i = 0; i < nitems(tog_commands); i++) {
9295 		const struct tog_cmd *cmd = &tog_commands[i];
9296 		fprintf(fp, " %s", cmd->name);
9297 	}
9298 	fputc('\n', fp);
9299 }
9300 
9301 __dead static void
9302 usage(int hflag, int status)
9303 {
9304 	FILE *fp = (status == 0) ? stdout : stderr;
9305 
9306 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9307 	    getprogname());
9308 	if (hflag) {
9309 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9310 		list_commands(fp);
9311 	}
9312 	exit(status);
9313 }
9314 
9315 static char **
9316 make_argv(int argc, ...)
9317 {
9318 	va_list ap;
9319 	char **argv;
9320 	int i;
9321 
9322 	va_start(ap, argc);
9323 
9324 	argv = calloc(argc, sizeof(char *));
9325 	if (argv == NULL)
9326 		err(1, "calloc");
9327 	for (i = 0; i < argc; i++) {
9328 		argv[i] = strdup(va_arg(ap, char *));
9329 		if (argv[i] == NULL)
9330 			err(1, "strdup");
9331 	}
9332 
9333 	va_end(ap);
9334 	return argv;
9335 }
9336 
9337 /*
9338  * Try to convert 'tog path' into a 'tog log path' command.
9339  * The user could simply have mistyped the command rather than knowingly
9340  * provided a path. So check whether argv[0] can in fact be resolved
9341  * to a path in the HEAD commit and print a special error if not.
9342  * This hack is for mpi@ <3
9343  */
9344 static const struct got_error *
9345 tog_log_with_path(int argc, char *argv[])
9346 {
9347 	const struct got_error *error = NULL, *close_err;
9348 	const struct tog_cmd *cmd = NULL;
9349 	struct got_repository *repo = NULL;
9350 	struct got_worktree *worktree = NULL;
9351 	struct got_object_id *commit_id = NULL, *id = NULL;
9352 	struct got_commit_object *commit = NULL;
9353 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9354 	char *commit_id_str = NULL, **cmd_argv = NULL;
9355 	int *pack_fds = NULL;
9356 
9357 	cwd = getcwd(NULL, 0);
9358 	if (cwd == NULL)
9359 		return got_error_from_errno("getcwd");
9360 
9361 	error = got_repo_pack_fds_open(&pack_fds);
9362 	if (error != NULL)
9363 		goto done;
9364 
9365 	error = got_worktree_open(&worktree, cwd);
9366 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9367 		goto done;
9368 
9369 	if (worktree)
9370 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9371 	else
9372 		repo_path = strdup(cwd);
9373 	if (repo_path == NULL) {
9374 		error = got_error_from_errno("strdup");
9375 		goto done;
9376 	}
9377 
9378 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9379 	if (error != NULL)
9380 		goto done;
9381 
9382 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9383 	    repo, worktree);
9384 	if (error)
9385 		goto done;
9386 
9387 	error = tog_load_refs(repo, 0);
9388 	if (error)
9389 		goto done;
9390 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9391 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9392 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9393 	if (error)
9394 		goto done;
9395 
9396 	if (worktree) {
9397 		got_worktree_close(worktree);
9398 		worktree = NULL;
9399 	}
9400 
9401 	error = got_object_open_as_commit(&commit, repo, commit_id);
9402 	if (error)
9403 		goto done;
9404 
9405 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9406 	if (error) {
9407 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9408 			goto done;
9409 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9410 		    getprogname(), argv[0]);
9411 		usage(1, 1);
9412 		/* not reached */
9413 	}
9414 
9415 	error = got_object_id_str(&commit_id_str, commit_id);
9416 	if (error)
9417 		goto done;
9418 
9419 	cmd = &tog_commands[0]; /* log */
9420 	argc = 4;
9421 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9422 	error = cmd->cmd_main(argc, cmd_argv);
9423 done:
9424 	if (repo) {
9425 		close_err = got_repo_close(repo);
9426 		if (error == NULL)
9427 			error = close_err;
9428 	}
9429 	if (commit)
9430 		got_object_commit_close(commit);
9431 	if (worktree)
9432 		got_worktree_close(worktree);
9433 	if (pack_fds) {
9434 		const struct got_error *pack_err =
9435 		    got_repo_pack_fds_close(pack_fds);
9436 		if (error == NULL)
9437 			error = pack_err;
9438 	}
9439 	free(id);
9440 	free(commit_id_str);
9441 	free(commit_id);
9442 	free(cwd);
9443 	free(repo_path);
9444 	free(in_repo_path);
9445 	if (cmd_argv) {
9446 		int i;
9447 		for (i = 0; i < argc; i++)
9448 			free(cmd_argv[i]);
9449 		free(cmd_argv);
9450 	}
9451 	tog_free_refs();
9452 	return error;
9453 }
9454 
9455 int
9456 main(int argc, char *argv[])
9457 {
9458 	const struct got_error *error = NULL;
9459 	const struct tog_cmd *cmd = NULL;
9460 	int ch, hflag = 0, Vflag = 0;
9461 	char **cmd_argv = NULL;
9462 	static const struct option longopts[] = {
9463 	    { "version", no_argument, NULL, 'V' },
9464 	    { NULL, 0, NULL, 0}
9465 	};
9466 	char *diff_algo_str = NULL;
9467 
9468 	setlocale(LC_CTYPE, "");
9469 
9470 #ifndef PROFILE
9471 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9472 	    NULL) == -1)
9473 		err(1, "pledge");
9474 #endif
9475 
9476 	if (!isatty(STDIN_FILENO))
9477 		errx(1, "standard input is not a tty");
9478 
9479 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9480 		switch (ch) {
9481 		case 'h':
9482 			hflag = 1;
9483 			break;
9484 		case 'V':
9485 			Vflag = 1;
9486 			break;
9487 		default:
9488 			usage(hflag, 1);
9489 			/* NOTREACHED */
9490 		}
9491 	}
9492 
9493 	argc -= optind;
9494 	argv += optind;
9495 	optind = 1;
9496 	optreset = 1;
9497 
9498 	if (Vflag) {
9499 		got_version_print_str();
9500 		return 0;
9501 	}
9502 
9503 	if (argc == 0) {
9504 		if (hflag)
9505 			usage(hflag, 0);
9506 		/* Build an argument vector which runs a default command. */
9507 		cmd = &tog_commands[0];
9508 		argc = 1;
9509 		cmd_argv = make_argv(argc, cmd->name);
9510 	} else {
9511 		size_t i;
9512 
9513 		/* Did the user specify a command? */
9514 		for (i = 0; i < nitems(tog_commands); i++) {
9515 			if (strncmp(tog_commands[i].name, argv[0],
9516 			    strlen(argv[0])) == 0) {
9517 				cmd = &tog_commands[i];
9518 				break;
9519 			}
9520 		}
9521 	}
9522 
9523 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9524 	if (diff_algo_str) {
9525 		if (strcasecmp(diff_algo_str, "patience") == 0)
9526 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9527 		if (strcasecmp(diff_algo_str, "myers") == 0)
9528 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9529 	}
9530 
9531 	if (cmd == NULL) {
9532 		if (argc != 1)
9533 			usage(0, 1);
9534 		/* No command specified; try log with a path */
9535 		error = tog_log_with_path(argc, argv);
9536 	} else {
9537 		if (hflag)
9538 			cmd->cmd_usage();
9539 		else
9540 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9541 	}
9542 
9543 	endwin();
9544 	if (cmd_argv) {
9545 		int i;
9546 		for (i = 0; i < argc; i++)
9547 			free(cmd_argv[i]);
9548 		free(cmd_argv);
9549 	}
9550 
9551 	if (error && error->code != GOT_ERR_CANCELLED &&
9552 	    error->code != GOT_ERR_EOF &&
9553 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9554 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9555 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9556 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9557 	return 0;
9558 }