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