1 /*
2  * Copyright (c) 2018, 2019 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 <errno.h>
22 #define _XOPEN_SOURCE_EXTENDED
23 #include <curses.h>
24 #undef _XOPEN_SOURCE_EXTENDED
25 #include <panel.h>
26 #include <locale.h>
27 #include <stdlib.h>
28 #include <stdio.h>
29 #include <getopt.h>
30 #include <string.h>
31 #include <err.h>
32 #include <unistd.h>
33 #include <util.h>
34 #include <limits.h>
35 #include <wchar.h>
36 #include <time.h>
37 #include <pthread.h>
38 #include <libgen.h>
39 #include <regex.h>
40 
41 #include "got_version.h"
42 #include "got_error.h"
43 #include "got_object.h"
44 #include "got_reference.h"
45 #include "got_repository.h"
46 #include "got_diff.h"
47 #include "got_opentemp.h"
48 #include "got_commit_graph.h"
49 #include "got_utf8.h"
50 #include "got_blame.h"
51 #include "got_privsep.h"
52 #include "got_path.h"
53 #include "got_worktree.h"
54 
55 #ifndef MIN
56 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
57 #endif
58 
59 #ifndef MAX
60 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
61 #endif
62 
63 #define CTRL(x)		((x) & 0x1f)
64 
65 #ifndef nitems
66 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
67 #endif
68 
69 struct tog_cmd {
70 	const char *name;
71 	const struct got_error *(*cmd_main)(int, char *[]);
72 	void (*cmd_usage)(void);
73 };
74 
75 __dead static void	usage(int);
76 __dead static void	usage_log(void);
77 __dead static void	usage_diff(void);
78 __dead static void	usage_blame(void);
79 __dead static void	usage_tree(void);
80 
81 static const struct got_error*	cmd_log(int, char *[]);
82 static const struct got_error*	cmd_diff(int, char *[]);
83 static const struct got_error*	cmd_blame(int, char *[]);
84 static const struct got_error*	cmd_tree(int, char *[]);
85 
86 static struct tog_cmd tog_commands[] = {
87 	{ "log",	cmd_log,	usage_log },
88 	{ "diff",	cmd_diff,	usage_diff },
89 	{ "blame",	cmd_blame,	usage_blame },
90 	{ "tree",	cmd_tree,	usage_tree },
91 };
92 
93 enum tog_view_type {
94 	TOG_VIEW_DIFF,
95 	TOG_VIEW_LOG,
96 	TOG_VIEW_BLAME,
97 	TOG_VIEW_TREE
98 };
99 
100 #define TOG_EOF_STRING	"(END)"
101 
102 struct commit_queue_entry {
103 	TAILQ_ENTRY(commit_queue_entry) entry;
104 	struct got_object_id *id;
105 	struct got_commit_object *commit;
106 	int idx;
107 };
108 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
109 struct commit_queue {
110 	int ncommits;
111 	struct commit_queue_head head;
112 };
113 
114 struct tog_diff_view_state {
115 	struct got_object_id *id1, *id2;
116 	FILE *f;
117 	int first_displayed_line;
118 	int last_displayed_line;
119 	int eof;
120 	int diff_context;
121 	struct got_repository *repo;
122 	struct got_reflist_head *refs;
123 
124 	/* passed from log view; may be NULL */
125 	struct tog_view *log_view;
126 };
127 
128 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
129 
130 struct tog_log_thread_args {
131 	pthread_cond_t need_commits;
132 	int commits_needed;
133 	struct got_commit_graph *graph;
134 	struct commit_queue *commits;
135 	const char *in_repo_path;
136 	struct got_object_id *start_id;
137 	struct got_repository *repo;
138 	int log_complete;
139 	sig_atomic_t *quit;
140 	struct tog_view *view;
141 	struct commit_queue_entry **first_displayed_entry;
142 	struct commit_queue_entry **selected_entry;
143 };
144 
145 struct tog_log_view_state {
146 	struct commit_queue commits;
147 	struct commit_queue_entry *first_displayed_entry;
148 	struct commit_queue_entry *last_displayed_entry;
149 	struct commit_queue_entry *selected_entry;
150 	int selected;
151 	char *in_repo_path;
152 	const char *head_ref_name;
153 	struct got_repository *repo;
154 	struct got_reflist_head *refs;
155 	struct got_object_id *start_id;
156 	sig_atomic_t quit;
157 	pthread_t thread;
158 	struct tog_log_thread_args thread_args;
159 	struct commit_queue_entry *matched_entry;
160 	struct commit_queue_entry *search_entry;
161 };
162 
163 struct tog_blame_cb_args {
164 	struct tog_blame_line *lines; /* one per line */
165 	int nlines;
166 
167 	struct tog_view *view;
168 	struct got_object_id *commit_id;
169 	int *quit;
170 };
171 
172 struct tog_blame_thread_args {
173 	const char *path;
174 	struct got_repository *repo;
175 	struct tog_blame_cb_args *cb_args;
176 	int *complete;
177 };
178 
179 struct tog_blame {
180 	FILE *f;
181 	size_t filesize;
182 	struct tog_blame_line *lines;
183 	int nlines;
184 	off_t *line_offsets;
185 	pthread_t thread;
186 	struct tog_blame_thread_args thread_args;
187 	struct tog_blame_cb_args cb_args;
188 	const char *path;
189 };
190 
191 struct tog_blame_view_state {
192 	int first_displayed_line;
193 	int last_displayed_line;
194 	int selected_line;
195 	int blame_complete;
196 	int eof;
197 	int done;
198 	struct got_object_id_queue blamed_commits;
199 	struct got_object_qid *blamed_commit;
200 	char *path;
201 	struct got_repository *repo;
202 	struct got_reflist_head *refs;
203 	struct got_object_id *commit_id;
204 	struct tog_blame blame;
205 	int matched_line;
206 };
207 
208 struct tog_parent_tree {
209 	TAILQ_ENTRY(tog_parent_tree) entry;
210 	struct got_tree_object *tree;
211 	struct got_tree_entry *first_displayed_entry;
212 	struct got_tree_entry *selected_entry;
213 	int selected;
214 };
215 
216 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
217 
218 struct tog_tree_view_state {
219 	char *tree_label;
220 	struct got_tree_object *root;
221 	struct got_tree_object *tree;
222 	const struct got_tree_entries *entries;
223 	struct got_tree_entry *first_displayed_entry;
224 	struct got_tree_entry *last_displayed_entry;
225 	struct got_tree_entry *selected_entry;
226 	int ndisplayed, selected, show_ids;
227 	struct tog_parent_trees parents;
228 	struct got_object_id *commit_id;
229 	struct got_repository *repo;
230 	struct got_reflist_head *refs;
231 	struct got_tree_entry *matched_entry;
232 };
233 
234 /*
235  * We implement two types of views: parent views and child views.
236  *
237  * The 'Tab' key switches between a parent view and its child view.
238  * Child views are shown side-by-side to their parent view, provided
239  * there is enough screen estate.
240  *
241  * When a new view is opened from within a parent view, this new view
242  * becomes a child view of the parent view, replacing any existing child.
243  *
244  * When a new view is opened from within a child view, this new view
245  * becomes a parent view which will obscure the views below until the
246  * user quits the new parent view by typing 'q'.
247  *
248  * This list of views contains parent views only.
249  * Child views are only pointed to by their parent view.
250  */
251 TAILQ_HEAD(tog_view_list_head, tog_view);
252 
253 struct tog_view {
254 	TAILQ_ENTRY(tog_view) entry;
255 	WINDOW *window;
256 	PANEL *panel;
257 	int nlines, ncols, begin_y, begin_x;
258 	int lines, cols; /* copies of LINES and COLS */
259 	int focussed;
260 	struct tog_view *parent;
261 	struct tog_view *child;
262 	int child_focussed;
263 
264 	/* type-specific state */
265 	enum tog_view_type type;
266 	union {
267 		struct tog_diff_view_state diff;
268 		struct tog_log_view_state log;
269 		struct tog_blame_view_state blame;
270 		struct tog_tree_view_state tree;
271 	} state;
272 
273 	const struct got_error *(*show)(struct tog_view *);
274 	const struct got_error *(*input)(struct tog_view **,
275 	    struct tog_view **, struct tog_view**, struct tog_view *, int);
276 	const struct got_error *(*close)(struct tog_view *);
277 
278 	const struct got_error *(*search_start)(struct tog_view *);
279 	const struct got_error *(*search_next)(struct tog_view *);
280 	int searching;
281 #define TOG_SEARCH_FORWARD	1
282 #define TOG_SEARCH_BACKWARD	2
283 	int search_next_done;
284 	regex_t regex;
285 };
286 
287 static const struct got_error *open_diff_view(struct tog_view *,
288     struct got_object_id *, struct got_object_id *, struct tog_view *,
289     struct got_reflist_head *, struct got_repository *);
290 static const struct got_error *show_diff_view(struct tog_view *);
291 static const struct got_error *input_diff_view(struct tog_view **,
292     struct tog_view **, struct tog_view **, struct tog_view *, int);
293 static const struct got_error* close_diff_view(struct tog_view *);
294 
295 static const struct got_error *open_log_view(struct tog_view *,
296     struct got_object_id *, struct got_reflist_head *,
297     struct got_repository *, const char *, const char *, int);
298 static const struct got_error * show_log_view(struct tog_view *);
299 static const struct got_error *input_log_view(struct tog_view **,
300     struct tog_view **, struct tog_view **, struct tog_view *, int);
301 static const struct got_error *close_log_view(struct tog_view *);
302 static const struct got_error *search_start_log_view(struct tog_view *);
303 static const struct got_error *search_next_log_view(struct tog_view *);
304 
305 static const struct got_error *open_blame_view(struct tog_view *, char *,
306     struct got_object_id *, struct got_reflist_head *, struct got_repository *);
307 static const struct got_error *show_blame_view(struct tog_view *);
308 static const struct got_error *input_blame_view(struct tog_view **,
309     struct tog_view **, struct tog_view **, struct tog_view *, int);
310 static const struct got_error *close_blame_view(struct tog_view *);
311 static const struct got_error *search_start_blame_view(struct tog_view *);
312 static const struct got_error *search_next_blame_view(struct tog_view *);
313 
314 static const struct got_error *open_tree_view(struct tog_view *,
315     struct got_tree_object *, struct got_object_id *,
316     struct got_reflist_head *, struct got_repository *);
317 static const struct got_error *show_tree_view(struct tog_view *);
318 static const struct got_error *input_tree_view(struct tog_view **,
319     struct tog_view **, struct tog_view **, struct tog_view *, int);
320 static const struct got_error *close_tree_view(struct tog_view *);
321 static const struct got_error *search_start_tree_view(struct tog_view *);
322 static const struct got_error *search_next_tree_view(struct tog_view *);
323 
324 static volatile sig_atomic_t tog_sigwinch_received;
325 
326 static void
327 tog_sigwinch(int signo)
328 {
329 	tog_sigwinch_received = 1;
330 }
331 
332 static const struct got_error *
333 view_close(struct tog_view *view)
334 {
335 	const struct got_error *err = NULL;
336 
337 	if (view->child) {
338 		view_close(view->child);
339 		view->child = NULL;
340 	}
341 	if (view->close)
342 		err = view->close(view);
343 	if (view->panel)
344 		del_panel(view->panel);
345 	if (view->window)
346 		delwin(view->window);
347 	free(view);
348 	return err;
349 }
350 
351 static struct tog_view *
352 view_open(int nlines, int ncols, int begin_y, int begin_x,
353     enum tog_view_type type)
354 {
355 	struct tog_view *view = calloc(1, sizeof(*view));
356 
357 	if (view == NULL)
358 		return NULL;
359 
360 	view->type = type;
361 	view->lines = LINES;
362 	view->cols = COLS;
363 	view->nlines = nlines ? nlines : LINES - begin_y;
364 	view->ncols = ncols ? ncols : COLS - begin_x;
365 	view->begin_y = begin_y;
366 	view->begin_x = begin_x;
367 	view->window = newwin(nlines, ncols, begin_y, begin_x);
368 	if (view->window == NULL) {
369 		view_close(view);
370 		return NULL;
371 	}
372 	view->panel = new_panel(view->window);
373 	if (view->panel == NULL ||
374 	    set_panel_userptr(view->panel, view) != OK) {
375 		view_close(view);
376 		return NULL;
377 	}
378 
379 	keypad(view->window, TRUE);
380 	return view;
381 }
382 
383 static int
384 view_split_begin_x(int begin_x)
385 {
386 	if (begin_x > 0 || COLS < 120)
387 		return 0;
388 	return (COLS - MAX(COLS / 2, 80));
389 }
390 
391 static const struct got_error *view_resize(struct tog_view *);
392 
393 static const struct got_error *
394 view_splitscreen(struct tog_view *view)
395 {
396 	const struct got_error *err = NULL;
397 
398 	view->begin_y = 0;
399 	view->begin_x = view_split_begin_x(0);
400 	view->nlines = LINES;
401 	view->ncols = COLS - view->begin_x;
402 	view->lines = LINES;
403 	view->cols = COLS;
404 	err = view_resize(view);
405 	if (err)
406 		return err;
407 
408 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
409 		return got_error_from_errno("mvwin");
410 
411 	return NULL;
412 }
413 
414 static const struct got_error *
415 view_fullscreen(struct tog_view *view)
416 {
417 	const struct got_error *err = NULL;
418 
419 	view->begin_x = 0;
420 	view->begin_y = 0;
421 	view->nlines = LINES;
422 	view->ncols = COLS;
423 	view->lines = LINES;
424 	view->cols = COLS;
425 	err = view_resize(view);
426 	if (err)
427 		return err;
428 
429 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
430 		return got_error_from_errno("mvwin");
431 
432 	return NULL;
433 }
434 
435 static int
436 view_is_parent_view(struct tog_view *view)
437 {
438 	return view->parent == NULL;
439 }
440 
441 static const struct got_error *
442 view_resize(struct tog_view *view)
443 {
444 	int nlines, ncols;
445 
446 	if (view->lines > LINES)
447 		nlines = view->nlines - (view->lines - LINES);
448 	else
449 		nlines = view->nlines + (LINES - view->lines);
450 
451 	if (view->cols > COLS)
452 		ncols = view->ncols - (view->cols - COLS);
453 	else
454 		ncols = view->ncols + (COLS - view->cols);
455 
456 	if (wresize(view->window, nlines, ncols) == ERR)
457 		return got_error_from_errno("wresize");
458 	if (replace_panel(view->panel, view->window) == ERR)
459 		return got_error_from_errno("replace_panel");
460 	wclear(view->window);
461 
462 	view->nlines = nlines;
463 	view->ncols = ncols;
464 	view->lines = LINES;
465 	view->cols = COLS;
466 
467 	if (view->child) {
468 		view->child->begin_x = view_split_begin_x(view->begin_x);
469 		if (view->child->begin_x == 0) {
470 			view_fullscreen(view->child);
471 			if (view->child->focussed)
472 				show_panel(view->child->panel);
473 			else
474 				show_panel(view->panel);
475 		} else {
476 			view_splitscreen(view->child);
477 			show_panel(view->child->panel);
478 		}
479 	}
480 
481 	return NULL;
482 }
483 
484 static const struct got_error *
485 view_close_child(struct tog_view *view)
486 {
487 	const struct got_error *err = NULL;
488 
489 	if (view->child == NULL)
490 		return NULL;
491 
492 	err = view_close(view->child);
493 	view->child = NULL;
494 	return err;
495 }
496 
497 static const struct got_error *
498 view_set_child(struct tog_view *view, struct tog_view *child)
499 {
500 	const struct got_error *err = NULL;
501 
502 	view->child = child;
503 	child->parent = view;
504 	return err;
505 }
506 
507 static int
508 view_is_splitscreen(struct tog_view *view)
509 {
510 	return view->begin_x > 0;
511 }
512 
513 static void
514 tog_resizeterm(void)
515 {
516 	int cols, lines;
517 	struct winsize size;
518 
519 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
520 		cols = 80;     /* Default */
521 		lines = 24;
522 	} else {
523 		cols = size.ws_col;
524 		lines = size.ws_row;
525 	}
526 	resize_term(lines, cols);
527 }
528 
529 static const struct got_error *
530 view_search_start(struct tog_view *view)
531 {
532 	const struct got_error *err = NULL;
533 	char pattern[1024];
534 	int ret;
535 
536 	if (view->nlines < 1)
537 		return NULL;
538 
539 	mvwaddstr(view->window, view->begin_y + view->nlines - 1,
540 	    view->begin_x, "/");
541 	wclrtoeol(view->window);
542 
543 	nocbreak();
544 	echo();
545 	ret = wgetnstr(view->window, pattern, sizeof(pattern));
546 	cbreak();
547 	noecho();
548 	if (ret == ERR)
549 		return NULL;
550 
551 	if (view->searching) {
552 		regfree(&view->regex);
553 		view->searching = 0;
554 	}
555 
556 	if (regcomp(&view->regex, pattern,
557 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE) == 0) {
558 		err = view->search_start(view);
559 		if (err) {
560 			regfree(&view->regex);
561 			return err;
562 		}
563 		view->searching = TOG_SEARCH_FORWARD;
564 		view->search_next_done = 0;
565 		view->search_next(view);
566 	}
567 
568 	return NULL;
569 }
570 
571 static const struct got_error *
572 view_input(struct tog_view **new, struct tog_view **dead,
573     struct tog_view **focus, int *done, struct tog_view *view,
574     struct tog_view_list_head *views)
575 {
576 	const struct got_error *err = NULL;
577 	struct tog_view *v;
578 	int ch, errcode;
579 
580 	*new = NULL;
581 	*dead = NULL;
582 	*focus = NULL;
583 
584 	if (view->searching && !view->search_next_done) {
585 		errcode = pthread_mutex_unlock(&tog_mutex);
586 		if (errcode)
587 			return got_error_set_errno(errcode,
588 			    "pthread_mutex_unlock");
589 		pthread_yield();
590 		errcode = pthread_mutex_lock(&tog_mutex);
591 		if (errcode)
592 			return got_error_set_errno(errcode,
593 			    "pthread_mutex_lock");
594 		view->search_next(view);
595 		return NULL;
596 	}
597 
598 	nodelay(stdscr, FALSE);
599 	/* Allow threads to make progress while we are waiting for input. */
600 	errcode = pthread_mutex_unlock(&tog_mutex);
601 	if (errcode)
602 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
603 	ch = wgetch(view->window);
604 	errcode = pthread_mutex_lock(&tog_mutex);
605 	if (errcode)
606 		return got_error_set_errno(errcode, "pthread_mutex_lock");
607 	nodelay(stdscr, TRUE);
608 
609 	if (tog_sigwinch_received) {
610 		tog_resizeterm();
611 		tog_sigwinch_received = 0;
612 		TAILQ_FOREACH(v, views, entry) {
613 			err = view_resize(v);
614 			if (err)
615 				return err;
616 			err = v->input(new, dead, focus, v, KEY_RESIZE);
617 			if (err)
618 				return err;
619 		}
620 	}
621 
622 	switch (ch) {
623 	case ERR:
624 		break;
625 	case '\t':
626 		if (view->child) {
627 			*focus = view->child;
628 			view->child_focussed = 1;
629 		} else if (view->parent) {
630 			*focus = view->parent;
631 			view->parent->child_focussed = 0;
632 		}
633 		break;
634 	case 'q':
635 		err = view->input(new, dead, focus, view, ch);
636 		*dead = view;
637 		break;
638 	case 'Q':
639 		*done = 1;
640 		break;
641 	case 'f':
642 		if (view_is_parent_view(view)) {
643 			if (view->child == NULL)
644 				break;
645 			if (view_is_splitscreen(view->child)) {
646 				*focus = view->child;
647 				view->child_focussed = 1;
648 				err = view_fullscreen(view->child);
649 			} else
650 				err = view_splitscreen(view->child);
651 			if (err)
652 				break;
653 			err = view->child->input(new, dead, focus,
654 			    view->child, KEY_RESIZE);
655 		} else {
656 			if (view_is_splitscreen(view)) {
657 				*focus = view;
658 				view->parent->child_focussed = 1;
659 				err = view_fullscreen(view);
660 			} else {
661 				err = view_splitscreen(view);
662 			}
663 			if (err)
664 				break;
665 			err = view->input(new, dead, focus, view,
666 			    KEY_RESIZE);
667 		}
668 		break;
669 	case KEY_RESIZE:
670 		break;
671 	case '/':
672 		if (view->search_start)
673 			view_search_start(view);
674 		else
675 			err = view->input(new, dead, focus, view, ch);
676 		break;
677 	case 'N':
678 	case 'n':
679 		if (view->search_next && view->searching) {
680 			view->searching = (ch == 'n' ?
681 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
682 			view->search_next_done = 0;
683 			view->search_next(view);
684 		} else
685 			err = view->input(new, dead, focus, view, ch);
686 		break;
687 	default:
688 		err = view->input(new, dead, focus, view, ch);
689 		break;
690 	}
691 
692 	return err;
693 }
694 
695 void
696 view_vborder(struct tog_view *view)
697 {
698 	PANEL *panel;
699 	struct tog_view *view_above;
700 
701 	if (view->parent)
702 		return view_vborder(view->parent);
703 
704 	panel = panel_above(view->panel);
705 	if (panel == NULL)
706 		return;
707 
708 	view_above = panel_userptr(panel);
709 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
710 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
711 }
712 
713 int
714 view_needs_focus_indication(struct tog_view *view)
715 {
716 	if (view_is_parent_view(view)) {
717 		if (view->child == NULL || view->child_focussed)
718 			return 0;
719 		if (!view_is_splitscreen(view->child))
720 			return 0;
721 	} else if (!view_is_splitscreen(view))
722 		return 0;
723 
724 	return view->focussed;
725 }
726 
727 static const struct got_error *
728 view_loop(struct tog_view *view)
729 {
730 	const struct got_error *err = NULL;
731 	struct tog_view_list_head views;
732 	struct tog_view *new_view, *dead_view, *focus_view, *main_view;
733 	int fast_refresh = 10;
734 	int done = 0, errcode;
735 
736 	errcode = pthread_mutex_lock(&tog_mutex);
737 	if (errcode)
738 		return got_error_set_errno(errcode, "pthread_mutex_lock");
739 
740 	TAILQ_INIT(&views);
741 	TAILQ_INSERT_HEAD(&views, view, entry);
742 
743 	main_view = view;
744 	view->focussed = 1;
745 	err = view->show(view);
746 	if (err)
747 		return err;
748 	update_panels();
749 	doupdate();
750 	while (!TAILQ_EMPTY(&views) && !done) {
751 		/* Refresh fast during initialization, then become slower. */
752 		if (fast_refresh && fast_refresh-- == 0)
753 			halfdelay(10); /* switch to once per second */
754 
755 		err = view_input(&new_view, &dead_view, &focus_view, &done,
756 		    view, &views);
757 		if (err)
758 			break;
759 		if (dead_view) {
760 			struct tog_view *prev = NULL;
761 
762 			if (view_is_parent_view(dead_view))
763 				prev = TAILQ_PREV(dead_view,
764 				    tog_view_list_head, entry);
765 			else if (view->parent != dead_view)
766 				prev = view->parent;
767 
768 			if (dead_view->parent)
769 				dead_view->parent->child = NULL;
770 			else
771 				TAILQ_REMOVE(&views, dead_view, entry);
772 
773 			err = view_close(dead_view);
774 			if (err || (dead_view == main_view && new_view == NULL))
775 				goto done;
776 
777 			if (view == dead_view) {
778 				if (focus_view)
779 					view = focus_view;
780 				else if (prev)
781 					view = prev;
782 				else if (!TAILQ_EMPTY(&views))
783 					view = TAILQ_LAST(&views,
784 					    tog_view_list_head);
785 				else
786 					view = NULL;
787 				if (view) {
788 					if (view->child && view->child_focussed)
789 						focus_view = view->child;
790 					else
791 						focus_view = view;
792 				}
793 			}
794 		}
795 		if (new_view) {
796 			struct tog_view *v, *t;
797 			/* Only allow one parent view per type. */
798 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
799 				if (v->type != new_view->type)
800 					continue;
801 				TAILQ_REMOVE(&views, v, entry);
802 				err = view_close(v);
803 				if (err)
804 					goto done;
805 				break;
806 			}
807 			TAILQ_INSERT_TAIL(&views, new_view, entry);
808 			view = new_view;
809 			if (focus_view == NULL)
810 				focus_view = new_view;
811 		}
812 		if (focus_view) {
813 			show_panel(focus_view->panel);
814 			if (view)
815 				view->focussed = 0;
816 			focus_view->focussed = 1;
817 			view = focus_view;
818 			if (new_view)
819 				show_panel(new_view->panel);
820 			if (view->child && view_is_splitscreen(view->child))
821 				show_panel(view->child->panel);
822 		}
823 		if (view) {
824 			if (focus_view == NULL) {
825 				view->focussed = 1;
826 				show_panel(view->panel);
827 				if (view->child && view_is_splitscreen(view->child))
828 					show_panel(view->child->panel);
829 				focus_view = view;
830 			}
831 			if (view->parent) {
832 				err = view->parent->show(view->parent);
833 				if (err)
834 					goto done;
835 			}
836 			err = view->show(view);
837 			if (err)
838 				goto done;
839 			if (view->child) {
840 				err = view->child->show(view->child);
841 				if (err)
842 					goto done;
843 			}
844 			update_panels();
845 			doupdate();
846 		}
847 	}
848 done:
849 	while (!TAILQ_EMPTY(&views)) {
850 		view = TAILQ_FIRST(&views);
851 		TAILQ_REMOVE(&views, view, entry);
852 		view_close(view);
853 	}
854 
855 	errcode = pthread_mutex_unlock(&tog_mutex);
856 	if (errcode)
857 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
858 
859 	return err;
860 }
861 
862 __dead static void
863 usage_log(void)
864 {
865 	endwin();
866 	fprintf(stderr,
867 	    "usage: %s log [-c commit] [-r repository-path] [path]\n",
868 	    getprogname());
869 	exit(1);
870 }
871 
872 /* Create newly allocated wide-character string equivalent to a byte string. */
873 static const struct got_error *
874 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
875 {
876 	char *vis = NULL;
877 	const struct got_error *err = NULL;
878 
879 	*ws = NULL;
880 	*wlen = mbstowcs(NULL, s, 0);
881 	if (*wlen == (size_t)-1) {
882 		int vislen;
883 		if (errno != EILSEQ)
884 			return got_error_from_errno("mbstowcs");
885 
886 		/* byte string invalid in current encoding; try to "fix" it */
887 		err = got_mbsavis(&vis, &vislen, s);
888 		if (err)
889 			return err;
890 		*wlen = mbstowcs(NULL, vis, 0);
891 		if (*wlen == (size_t)-1) {
892 			err = got_error_from_errno("mbstowcs"); /* give up */
893 			goto done;
894 		}
895 	}
896 
897 	*ws = calloc(*wlen + 1, sizeof(*ws));
898 	if (*ws == NULL) {
899 		err = got_error_from_errno("calloc");
900 		goto done;
901 	}
902 
903 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
904 		err = got_error_from_errno("mbstowcs");
905 done:
906 	free(vis);
907 	if (err) {
908 		free(*ws);
909 		*ws = NULL;
910 		*wlen = 0;
911 	}
912 	return err;
913 }
914 
915 /* Format a line for display, ensuring that it won't overflow a width limit. */
916 static const struct got_error *
917 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
918 {
919 	const struct got_error *err = NULL;
920 	int cols = 0;
921 	wchar_t *wline = NULL;
922 	size_t wlen;
923 	int i;
924 
925 	*wlinep = NULL;
926 	*widthp = 0;
927 
928 	err = mbs2ws(&wline, &wlen, line);
929 	if (err)
930 		return err;
931 
932 	i = 0;
933 	while (i < wlen && cols < wlimit) {
934 		int width = wcwidth(wline[i]);
935 		switch (width) {
936 		case 0:
937 			i++;
938 			break;
939 		case 1:
940 		case 2:
941 			if (cols + width <= wlimit)
942 				cols += width;
943 			i++;
944 			break;
945 		case -1:
946 			if (wline[i] == L'\t')
947 				cols += TABSIZE - ((cols + 1) % TABSIZE);
948 			i++;
949 			break;
950 		default:
951 			err = got_error_from_errno("wcwidth");
952 			goto done;
953 		}
954 	}
955 	wline[i] = L'\0';
956 	if (widthp)
957 		*widthp = cols;
958 done:
959 	if (err)
960 		free(wline);
961 	else
962 		*wlinep = wline;
963 	return err;
964 }
965 
966 static const struct got_error*
967 build_refs_str(char **refs_str, struct got_reflist_head *refs,
968     struct got_object_id *id)
969 {
970 	static const struct got_error *err = NULL;
971 	struct got_reflist_entry *re;
972 	char *s;
973 	const char *name;
974 
975 	*refs_str = NULL;
976 
977 	SIMPLEQ_FOREACH(re, refs, entry) {
978 		if (got_object_id_cmp(re->id, id) != 0)
979 			continue;
980 		name = got_ref_get_name(re->ref);
981 		if (strcmp(name, GOT_REF_HEAD) == 0)
982 			continue;
983 		if (strncmp(name, "refs/", 5) == 0)
984 			name += 5;
985 		if (strncmp(name, "got/", 4) == 0)
986 			continue;
987 		if (strncmp(name, "heads/", 6) == 0)
988 			name += 6;
989 		if (strncmp(name, "remotes/", 8) == 0)
990 			name += 8;
991 		s = *refs_str;
992 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
993 		    s ? ", " : "", name) == -1) {
994 			err = got_error_from_errno("asprintf");
995 			free(s);
996 			*refs_str = NULL;
997 			break;
998 		}
999 		free(s);
1000 	}
1001 
1002 	return err;
1003 }
1004 
1005 static const struct got_error *
1006 format_author(wchar_t **wauthor, int *author_width, char *author, int limit)
1007 {
1008 	char *smallerthan, *at;
1009 
1010 	smallerthan = strchr(author, '<');
1011 	if (smallerthan && smallerthan[1] != '\0')
1012 		author = smallerthan + 1;
1013 	at = strchr(author, '@');
1014 	if (at)
1015 		*at = '\0';
1016 	return format_line(wauthor, author_width, author, limit);
1017 }
1018 
1019 static const struct got_error *
1020 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1021     struct got_object_id *id, struct got_reflist_head *refs,
1022     int author_display_cols)
1023 {
1024 	const struct got_error *err = NULL;
1025 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
1026 	char *logmsg0 = NULL, *logmsg = NULL;
1027 	char *author = NULL;
1028 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1029 	int author_width, logmsg_width;
1030 	char *newline, *line = NULL;
1031 	int col, limit;
1032 	static const size_t date_display_cols = 9;
1033 	const int avail = view->ncols;
1034 	struct tm tm;
1035 	time_t committer_time;
1036 
1037 	committer_time = got_object_commit_get_committer_time(commit);
1038 	if (localtime_r(&committer_time, &tm) == NULL)
1039 		return got_error_from_errno("localtime_r");
1040 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
1041 	    >= sizeof(datebuf))
1042 		return got_error(GOT_ERR_NO_SPACE);
1043 
1044 	if (avail < date_display_cols)
1045 		limit = MIN(sizeof(datebuf) - 1, avail);
1046 	else
1047 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1048 	waddnstr(view->window, datebuf, limit);
1049 	col = limit + 1;
1050 	if (col > avail)
1051 		goto done;
1052 
1053 	author = strdup(got_object_commit_get_author(commit));
1054 	if (author == NULL) {
1055 		err = got_error_from_errno("strdup");
1056 		goto done;
1057 	}
1058 	err = format_author(&wauthor, &author_width, author, avail - col);
1059 	if (err)
1060 		goto done;
1061 	waddwstr(view->window, wauthor);
1062 	col += author_width;
1063 	while (col <= avail && author_width < author_display_cols + 2) {
1064 		waddch(view->window, ' ');
1065 		col++;
1066 		author_width++;
1067 	}
1068 	if (col > avail)
1069 		goto done;
1070 
1071 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
1072 	if (logmsg0 == NULL) {
1073 		err = got_error_from_errno("strdup");
1074 		goto done;
1075 	}
1076 	logmsg = logmsg0;
1077 	while (*logmsg == '\n')
1078 		logmsg++;
1079 	newline = strchr(logmsg, '\n');
1080 	if (newline)
1081 		*newline = '\0';
1082 	limit = avail - col;
1083 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
1084 	if (err)
1085 		goto done;
1086 	waddwstr(view->window, wlogmsg);
1087 	col += logmsg_width;
1088 	while (col <= avail) {
1089 		waddch(view->window, ' ');
1090 		col++;
1091 	}
1092 done:
1093 	free(logmsg0);
1094 	free(wlogmsg);
1095 	free(author);
1096 	free(wauthor);
1097 	free(line);
1098 	return err;
1099 }
1100 
1101 static struct commit_queue_entry *
1102 alloc_commit_queue_entry(struct got_commit_object *commit,
1103     struct got_object_id *id)
1104 {
1105 	struct commit_queue_entry *entry;
1106 
1107 	entry = calloc(1, sizeof(*entry));
1108 	if (entry == NULL)
1109 		return NULL;
1110 
1111 	entry->id = id;
1112 	entry->commit = commit;
1113 	return entry;
1114 }
1115 
1116 static void
1117 pop_commit(struct commit_queue *commits)
1118 {
1119 	struct commit_queue_entry *entry;
1120 
1121 	entry = TAILQ_FIRST(&commits->head);
1122 	TAILQ_REMOVE(&commits->head, entry, entry);
1123 	got_object_commit_close(entry->commit);
1124 	commits->ncommits--;
1125 	/* Don't free entry->id! It is owned by the commit graph. */
1126 	free(entry);
1127 }
1128 
1129 static void
1130 free_commits(struct commit_queue *commits)
1131 {
1132 	while (!TAILQ_EMPTY(&commits->head))
1133 		pop_commit(commits);
1134 }
1135 
1136 static const struct got_error *
1137 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
1138     int minqueue, struct got_repository *repo, const char *path)
1139 {
1140 	const struct got_error *err = NULL;
1141 	int nqueued = 0;
1142 
1143 	/*
1144 	 * We keep all commits open throughout the lifetime of the log
1145 	 * view in order to avoid having to re-fetch commits from disk
1146 	 * while updating the display.
1147 	 */
1148 	while (nqueued < minqueue) {
1149 		struct got_object_id *id;
1150 		struct got_commit_object *commit;
1151 		struct commit_queue_entry *entry;
1152 		int errcode;
1153 
1154 		err = got_commit_graph_iter_next(&id, graph);
1155 		if (err) {
1156 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1157 				break;
1158 			err = got_commit_graph_fetch_commits(graph,
1159 			    minqueue, repo);
1160 			if (err)
1161 				return err;
1162 			continue;
1163 		}
1164 
1165 		if (id == NULL)
1166 			break;
1167 
1168 		err = got_object_open_as_commit(&commit, repo, id);
1169 		if (err)
1170 			break;
1171 		entry = alloc_commit_queue_entry(commit, id);
1172 		if (entry == NULL) {
1173 			err = got_error_from_errno("alloc_commit_queue_entry");
1174 			break;
1175 		}
1176 
1177 		errcode = pthread_mutex_lock(&tog_mutex);
1178 		if (errcode) {
1179 			err = got_error_set_errno(errcode, "pthread_mutex_lock");
1180 			break;
1181 		}
1182 
1183 		entry->idx = commits->ncommits;
1184 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1185 		nqueued++;
1186 		commits->ncommits++;
1187 
1188 		errcode = pthread_mutex_unlock(&tog_mutex);
1189 		if (errcode && err == NULL)
1190 			err = got_error_set_errno(errcode,
1191 			    "pthread_mutex_unlock");
1192 	}
1193 
1194 	return err;
1195 }
1196 
1197 static const struct got_error *
1198 get_head_commit_id(struct got_object_id **head_id, const char *branch_name,
1199     struct got_repository *repo)
1200 {
1201 	const struct got_error *err = NULL;
1202 	struct got_reference *head_ref;
1203 
1204 	*head_id = NULL;
1205 
1206 	err = got_ref_open(&head_ref, repo, branch_name, 0);
1207 	if (err)
1208 		return err;
1209 
1210 	err = got_ref_resolve(head_id, repo, head_ref);
1211 	got_ref_close(head_ref);
1212 	if (err) {
1213 		*head_id = NULL;
1214 		return err;
1215 	}
1216 
1217 	return NULL;
1218 }
1219 
1220 static const struct got_error *
1221 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1222     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1223     struct commit_queue *commits, int selected_idx, int limit,
1224     struct got_reflist_head *refs, const char *path, int commits_needed)
1225 {
1226 	const struct got_error *err = NULL;
1227 	struct commit_queue_entry *entry;
1228 	int width;
1229 	int ncommits, author_cols = 10;
1230 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1231 	char *refs_str = NULL;
1232 	wchar_t *wline;
1233 
1234 	entry = first;
1235 	ncommits = 0;
1236 	while (entry) {
1237 		if (ncommits == selected_idx) {
1238 			*selected = entry;
1239 			break;
1240 		}
1241 		entry = TAILQ_NEXT(entry, entry);
1242 		ncommits++;
1243 	}
1244 
1245 	if (*selected && !(view->searching && view->search_next_done == 0)) {
1246 		err = got_object_id_str(&id_str, (*selected)->id);
1247 		if (err)
1248 			return err;
1249 		if (refs) {
1250 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1251 			if (err)
1252 				goto done;
1253 		}
1254 	}
1255 
1256 	if (commits_needed == 0)
1257 		halfdelay(10); /* disable fast refresh */
1258 
1259 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1260 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1261 	    commits_needed > 0 ?
1262 	    (view->searching && view->search_next_done == 0
1263 	    ? "searching..." : "loading... ") :
1264 	    (refs_str ? refs_str : "")) == -1) {
1265 		err = got_error_from_errno("asprintf");
1266 		goto done;
1267 	}
1268 
1269 	if (path && strcmp(path, "/") != 0) {
1270 		if (asprintf(&header, "commit %s %s%s",
1271 		    id_str ? id_str : "........................................",
1272 		    path, ncommits_str) == -1) {
1273 			err = got_error_from_errno("asprintf");
1274 			header = NULL;
1275 			goto done;
1276 		}
1277 	} else if (asprintf(&header, "commit %s%s",
1278 	    id_str ? id_str : "........................................",
1279 	    ncommits_str) == -1) {
1280 		err = got_error_from_errno("asprintf");
1281 		header = NULL;
1282 		goto done;
1283 	}
1284 	err = format_line(&wline, &width, header, view->ncols);
1285 	if (err)
1286 		goto done;
1287 
1288 	werase(view->window);
1289 
1290 	if (view_needs_focus_indication(view))
1291 		wstandout(view->window);
1292 	waddwstr(view->window, wline);
1293 	while (width < view->ncols) {
1294 		waddch(view->window, ' ');
1295 		width++;
1296 	}
1297 	if (view_needs_focus_indication(view))
1298 		wstandend(view->window);
1299 	free(wline);
1300 	if (limit <= 1)
1301 		goto done;
1302 
1303 	/* Grow author column size if necessary. */
1304 	entry = first;
1305 	ncommits = 0;
1306 	while (entry) {
1307 		char *author;
1308 		wchar_t *wauthor;
1309 		int width;
1310 		if (ncommits >= limit - 1)
1311 			break;
1312 		author = strdup(got_object_commit_get_author(entry->commit));
1313 		if (author == NULL) {
1314 			err = got_error_from_errno("strdup");
1315 			goto done;
1316 		}
1317 		err = format_author(&wauthor, &width, author, COLS);
1318 		if (author_cols < width)
1319 			author_cols = width;
1320 		free(wauthor);
1321 		free(author);
1322 		entry = TAILQ_NEXT(entry, entry);
1323 	}
1324 
1325 	entry = first;
1326 	*last = first;
1327 	ncommits = 0;
1328 	while (entry) {
1329 		if (ncommits >= limit - 1)
1330 			break;
1331 		if (ncommits == selected_idx)
1332 			wstandout(view->window);
1333 		err = draw_commit(view, entry->commit, entry->id, refs,
1334 		    author_cols);
1335 		if (ncommits == selected_idx)
1336 			wstandend(view->window);
1337 		if (err)
1338 			goto done;
1339 		ncommits++;
1340 		*last = entry;
1341 		entry = TAILQ_NEXT(entry, entry);
1342 	}
1343 
1344 	view_vborder(view);
1345 done:
1346 	free(id_str);
1347 	free(refs_str);
1348 	free(ncommits_str);
1349 	free(header);
1350 	return err;
1351 }
1352 
1353 static void
1354 scroll_up(struct tog_view *view,
1355     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1356     struct commit_queue *commits)
1357 {
1358 	struct commit_queue_entry *entry;
1359 	int nscrolled = 0;
1360 
1361 	entry = TAILQ_FIRST(&commits->head);
1362 	if (*first_displayed_entry == entry)
1363 		return;
1364 
1365 	entry = *first_displayed_entry;
1366 	while (entry && nscrolled < maxscroll) {
1367 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1368 		if (entry) {
1369 			*first_displayed_entry = entry;
1370 			nscrolled++;
1371 		}
1372 	}
1373 }
1374 
1375 static const struct got_error *
1376 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1377     pthread_cond_t *need_commits)
1378 {
1379 	int errcode;
1380 	int max_wait = 20;
1381 
1382 	halfdelay(1); /* fast refresh while loading commits */
1383 
1384 	while (*commits_needed > 0) {
1385 		if (*log_complete)
1386 			break;
1387 
1388 		/* Wake the log thread. */
1389 		errcode = pthread_cond_signal(need_commits);
1390 		if (errcode)
1391 			return got_error_set_errno(errcode,
1392 			    "pthread_cond_signal");
1393 		errcode = pthread_mutex_unlock(&tog_mutex);
1394 		if (errcode)
1395 			return got_error_set_errno(errcode,
1396 			    "pthread_mutex_unlock");
1397 		pthread_yield();
1398 		errcode = pthread_mutex_lock(&tog_mutex);
1399 		if (errcode)
1400 			return got_error_set_errno(errcode,
1401 			    "pthread_mutex_lock");
1402 
1403 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1404 			/*
1405 			 * Thread is not done yet; lose a key press
1406 			 * and let the user retry... this way the GUI
1407 			 * remains interactive while logging deep paths
1408 			 * with few commits in history.
1409 			 */
1410 			return NULL;
1411 		}
1412 	}
1413 
1414 	return NULL;
1415 }
1416 
1417 static const struct got_error *
1418 scroll_down(struct tog_view *view,
1419     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1420     struct commit_queue_entry **last_displayed_entry,
1421     struct commit_queue *commits, int *log_complete, int *commits_needed,
1422     pthread_cond_t *need_commits)
1423 {
1424 	const struct got_error *err = NULL;
1425 	struct commit_queue_entry *pentry;
1426 	int nscrolled = 0;
1427 
1428 	if (*last_displayed_entry == NULL)
1429 		return NULL;
1430 
1431 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1432 	if (pentry == NULL && !*log_complete) {
1433 		/*
1434 		 * Ask the log thread for required amount of commits
1435 		 * plus some amount of pre-fetching.
1436 		 */
1437 		(*commits_needed) += maxscroll + 20;
1438 		err = trigger_log_thread(0, commits_needed, log_complete,
1439 		    need_commits);
1440 		if (err)
1441 			return err;
1442 	}
1443 
1444 	do {
1445 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1446 		if (pentry == NULL)
1447 			break;
1448 
1449 		*last_displayed_entry = pentry;
1450 
1451 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1452 		if (pentry == NULL)
1453 			break;
1454 		*first_displayed_entry = pentry;
1455 	} while (++nscrolled < maxscroll);
1456 
1457 	return err;
1458 }
1459 
1460 static const struct got_error *
1461 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1462     struct got_commit_object *commit, struct got_object_id *commit_id,
1463     struct tog_view *log_view, struct got_reflist_head *refs,
1464     struct got_repository *repo)
1465 {
1466 	const struct got_error *err;
1467 	struct got_object_qid *parent_id;
1468 	struct tog_view *diff_view;
1469 
1470 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1471 	if (diff_view == NULL)
1472 		return got_error_from_errno("view_open");
1473 
1474 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1475 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1476 	    commit_id, log_view, refs, repo);
1477 	if (err == NULL)
1478 		*new_view = diff_view;
1479 	return err;
1480 }
1481 
1482 static const struct got_error *
1483 tree_view_visit_subtree(struct got_tree_object *subtree,
1484     struct tog_tree_view_state *s)
1485 {
1486 	struct tog_parent_tree *parent;
1487 
1488 	parent = calloc(1, sizeof(*parent));
1489 	if (parent == NULL)
1490 		return got_error_from_errno("calloc");
1491 
1492 	parent->tree = s->tree;
1493 	parent->first_displayed_entry = s->first_displayed_entry;
1494 	parent->selected_entry = s->selected_entry;
1495 	parent->selected = s->selected;
1496 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
1497 	s->tree = subtree;
1498 	s->entries = got_object_tree_get_entries(s->tree);
1499 	s->selected = 0;
1500 	s->first_displayed_entry = NULL;
1501 	return NULL;
1502 }
1503 
1504 
1505 static const struct got_error *
1506 browse_commit_tree(struct tog_view **new_view, int begin_x,
1507     struct commit_queue_entry *entry, const char *path,
1508     struct got_reflist_head *refs, struct got_repository *repo)
1509 {
1510 	const struct got_error *err = NULL;
1511 	struct got_tree_object *tree;
1512 	struct got_tree_entry *te;
1513 	struct tog_tree_view_state *s;
1514 	struct tog_view *tree_view;
1515 	char *slash, *subpath = NULL;
1516 	const char *p;
1517 
1518 	err = got_object_open_as_tree(&tree, repo,
1519 	    got_object_commit_get_tree_id(entry->commit));
1520 	if (err)
1521 		return err;
1522 
1523 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1524 	if (tree_view == NULL)
1525 		return got_error_from_errno("view_open");
1526 
1527 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1528 	if (err) {
1529 		got_object_tree_close(tree);
1530 		return err;
1531 	}
1532 	s = &tree_view->state.tree;
1533 
1534 	*new_view = tree_view;
1535 
1536 	/* Walk the path and open corresponding tree objects. */
1537 	p = path;
1538 	while (*p) {
1539 		struct got_object_id *tree_id;
1540 
1541 		while (p[0] == '/')
1542 			p++;
1543 
1544 		/* Ensure the correct subtree entry is selected. */
1545 		slash = strchr(p, '/');
1546 		if (slash == NULL)
1547 			slash = strchr(p, '\0');
1548 		SIMPLEQ_FOREACH(te, &s->entries->head, entry) {
1549 			if (strncmp(p, te->name, slash - p) == 0) {
1550 				s->selected_entry = te;
1551 				break;
1552 			}
1553 			s->selected++;
1554 		}
1555 		if (s->selected_entry == NULL) {
1556 			err = got_error(GOT_ERR_NO_TREE_ENTRY);
1557 			break;
1558 		}
1559 		if (s->tree != s->root)
1560 			s->selected++; /* skip '..' */
1561 
1562 		if (!S_ISDIR(s->selected_entry->mode)) {
1563 			/* Jump to this file's entry. */
1564 			s->first_displayed_entry = s->selected_entry;
1565 			s->selected = 0;
1566 			break;
1567 		}
1568 
1569 		slash = strchr(p, '/');
1570 		if (slash)
1571 			subpath = strndup(path, slash - path);
1572 		else
1573 			subpath = strdup(path);
1574 		if (subpath == NULL) {
1575 			err = got_error_from_errno("strdup");
1576 			break;
1577 		}
1578 
1579 		err = got_object_id_by_path(&tree_id, repo, entry->id,
1580 		    subpath);
1581 		if (err)
1582 			break;
1583 
1584 		err = got_object_open_as_tree(&tree, repo, tree_id);
1585 		free(tree_id);
1586 		if (err)
1587 			break;
1588 
1589 		err = tree_view_visit_subtree(tree, s);
1590 		if (err) {
1591 			got_object_tree_close(tree);
1592 			break;
1593 		}
1594 		if (slash == NULL)
1595 			break;
1596 		free(subpath);
1597 		subpath = NULL;
1598 		p = slash;
1599 	}
1600 
1601 	free(subpath);
1602 	return err;
1603 }
1604 
1605 static void *
1606 log_thread(void *arg)
1607 {
1608 	const struct got_error *err = NULL;
1609 	int errcode = 0;
1610 	struct tog_log_thread_args *a = arg;
1611 	int done = 0;
1612 
1613 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1614 	if (err)
1615 		return (void *)err;
1616 
1617 	while (!done && !err) {
1618 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1619 		    a->in_repo_path);
1620 		if (err) {
1621 			if (err->code != GOT_ERR_ITER_COMPLETED)
1622 				return (void *)err;
1623 			err = NULL;
1624 			done = 1;
1625 		} else if (a->commits_needed > 0)
1626 			a->commits_needed--;
1627 
1628 		errcode = pthread_mutex_lock(&tog_mutex);
1629 		if (errcode) {
1630 			err = got_error_set_errno(errcode,
1631 			    "pthread_mutex_lock");
1632 			break;
1633 		} else if (*a->quit)
1634 			done = 1;
1635 		else if (*a->first_displayed_entry == NULL) {
1636 			*a->first_displayed_entry =
1637 			    TAILQ_FIRST(&a->commits->head);
1638 			*a->selected_entry = *a->first_displayed_entry;
1639 		}
1640 
1641 		if (done)
1642 			a->commits_needed = 0;
1643 		else if (a->commits_needed == 0) {
1644 			errcode = pthread_cond_wait(&a->need_commits,
1645 			    &tog_mutex);
1646 			if (errcode)
1647 				err = got_error_set_errno(errcode,
1648 				    "pthread_cond_wait");
1649 		}
1650 
1651 		errcode = pthread_mutex_unlock(&tog_mutex);
1652 		if (errcode && err == NULL)
1653 			err = got_error_set_errno(errcode,
1654 			    "pthread_mutex_unlock");
1655 	}
1656 	a->log_complete = 1;
1657 	return (void *)err;
1658 }
1659 
1660 static const struct got_error *
1661 stop_log_thread(struct tog_log_view_state *s)
1662 {
1663 	const struct got_error *err = NULL;
1664 	int errcode;
1665 
1666 	if (s->thread) {
1667 		s->quit = 1;
1668 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1669 		if (errcode)
1670 			return got_error_set_errno(errcode,
1671 			    "pthread_cond_signal");
1672 		errcode = pthread_mutex_unlock(&tog_mutex);
1673 		if (errcode)
1674 			return got_error_set_errno(errcode,
1675 			    "pthread_mutex_unlock");
1676 		errcode = pthread_join(s->thread, (void **)&err);
1677 		if (errcode)
1678 			return got_error_set_errno(errcode, "pthread_join");
1679 		errcode = pthread_mutex_lock(&tog_mutex);
1680 		if (errcode)
1681 			return got_error_set_errno(errcode,
1682 			    "pthread_mutex_lock");
1683 		s->thread = NULL;
1684 	}
1685 
1686 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1687 	if (errcode && err == NULL)
1688 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
1689 
1690 	if (s->thread_args.repo) {
1691 		got_repo_close(s->thread_args.repo);
1692 		s->thread_args.repo = NULL;
1693 	}
1694 
1695 	if (s->thread_args.graph) {
1696 		got_commit_graph_close(s->thread_args.graph);
1697 		s->thread_args.graph = NULL;
1698 	}
1699 
1700 	return err;
1701 }
1702 
1703 static const struct got_error *
1704 close_log_view(struct tog_view *view)
1705 {
1706 	const struct got_error *err = NULL;
1707 	struct tog_log_view_state *s = &view->state.log;
1708 
1709 	err = stop_log_thread(s);
1710 	free_commits(&s->commits);
1711 	free(s->in_repo_path);
1712 	s->in_repo_path = NULL;
1713 	free(s->start_id);
1714 	s->start_id = NULL;
1715 	return err;
1716 }
1717 
1718 static const struct got_error *
1719 search_start_log_view(struct tog_view *view)
1720 {
1721 	struct tog_log_view_state *s = &view->state.log;
1722 
1723 	s->matched_entry = NULL;
1724 	s->search_entry = NULL;
1725 	return NULL;
1726 }
1727 
1728 static int
1729 match_commit(struct got_commit_object *commit, const char *id_str,
1730     regex_t *regex)
1731 {
1732 	regmatch_t regmatch;
1733 
1734 	if (regexec(regex, got_object_commit_get_author(commit), 1,
1735 	    &regmatch, 0) == 0 ||
1736 	    regexec(regex, got_object_commit_get_committer(commit), 1,
1737 	    &regmatch, 0) == 0 ||
1738 	    regexec(regex, got_object_commit_get_logmsg(commit), 1,
1739 	    &regmatch, 0) == 0 ||
1740 	    regexec(regex, id_str, 1, &regmatch, 0) == 0)
1741 		return 1;
1742 
1743 	return 0;
1744 }
1745 
1746 static const struct got_error *
1747 search_next_log_view(struct tog_view *view)
1748 {
1749 	const struct got_error *err = NULL;
1750 	struct tog_log_view_state *s = &view->state.log;
1751 	struct commit_queue_entry *entry;
1752 
1753 	if (!view->searching) {
1754 		view->search_next_done = 1;
1755 		return NULL;
1756 	}
1757 
1758 	if (s->search_entry) {
1759 		if (wgetch(view->window) == KEY_BACKSPACE) {
1760 			view->search_next_done = 1;
1761 			return NULL;
1762 		}
1763 		if (view->searching == TOG_SEARCH_FORWARD)
1764 			entry = TAILQ_NEXT(s->search_entry, entry);
1765 		else
1766 			entry = TAILQ_PREV(s->search_entry,
1767 			    commit_queue_head, entry);
1768 	} else if (s->matched_entry) {
1769 		if (view->searching == TOG_SEARCH_FORWARD)
1770 			entry = TAILQ_NEXT(s->selected_entry, entry);
1771 		else
1772 			entry = TAILQ_PREV(s->selected_entry,
1773 			    commit_queue_head, entry);
1774 	} else {
1775 		if (view->searching == TOG_SEARCH_FORWARD)
1776 			entry = TAILQ_FIRST(&s->commits.head);
1777 		else
1778 			entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
1779 	}
1780 
1781 	while (1) {
1782 		char *id_str;
1783 		if (entry == NULL) {
1784 			if (s->thread_args.log_complete ||
1785 			    view->searching == TOG_SEARCH_BACKWARD) {
1786 				view->search_next_done = 1;
1787 				return NULL;
1788 			}
1789 			/*
1790 			 * Poke the log thread for more commits and return,
1791 			 * allowing the main loop to make progress. Search
1792 			 * will resume at s->search_entry once we come back.
1793 			 */
1794 			s->thread_args.commits_needed++;
1795 			return trigger_log_thread(1,
1796 			    &s->thread_args.commits_needed,
1797 			    &s->thread_args.log_complete,
1798 			    &s->thread_args.need_commits);
1799 		}
1800 
1801 		err = got_object_id_str(&id_str, entry->id);
1802 		if (err)
1803 			return err;
1804 
1805 		if (match_commit(entry->commit, id_str, &view->regex)) {
1806 			view->search_next_done = 1;
1807 			s->matched_entry = entry;
1808 			free(id_str);
1809 			break;
1810 		}
1811 		free(id_str);
1812 		s->search_entry = entry;
1813 		if (view->searching == TOG_SEARCH_FORWARD)
1814 			entry = TAILQ_NEXT(entry, entry);
1815 		else
1816 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
1817 	}
1818 
1819 	if (s->matched_entry) {
1820 		int cur = s->selected_entry->idx;
1821 		while (cur < s->matched_entry->idx) {
1822 			err = input_log_view(NULL, NULL, NULL, view, KEY_DOWN);
1823 			if (err)
1824 				return err;
1825 			cur++;
1826 		}
1827 		while (cur > s->matched_entry->idx) {
1828 			err = input_log_view(NULL, NULL, NULL, view, KEY_UP);
1829 			if (err)
1830 				return err;
1831 			cur--;
1832 		}
1833 	}
1834 
1835 	s->search_entry = NULL;
1836 
1837 	return NULL;
1838 }
1839 
1840 static const struct got_error *
1841 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1842     struct got_reflist_head *refs, struct got_repository *repo,
1843     const char *head_ref_name, const char *path, int check_disk)
1844 {
1845 	const struct got_error *err = NULL;
1846 	struct tog_log_view_state *s = &view->state.log;
1847 	struct got_repository *thread_repo = NULL;
1848 	struct got_commit_graph *thread_graph = NULL;
1849 	int errcode;
1850 
1851 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1852 	if (err != NULL)
1853 		goto done;
1854 
1855 	/* The commit queue only contains commits being displayed. */
1856 	TAILQ_INIT(&s->commits.head);
1857 	s->commits.ncommits = 0;
1858 
1859 	s->refs = refs;
1860 	s->repo = repo;
1861 	s->head_ref_name = head_ref_name;
1862 	s->start_id = got_object_id_dup(start_id);
1863 	if (s->start_id == NULL) {
1864 		err = got_error_from_errno("got_object_id_dup");
1865 		goto done;
1866 	}
1867 
1868 	view->show = show_log_view;
1869 	view->input = input_log_view;
1870 	view->close = close_log_view;
1871 	view->search_start = search_start_log_view;
1872 	view->search_next = search_next_log_view;
1873 
1874 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1875 	if (err)
1876 		goto done;
1877 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1878 	    0, thread_repo);
1879 	if (err)
1880 		goto done;
1881 
1882 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1883 	if (errcode) {
1884 		err = got_error_set_errno(errcode, "pthread_cond_init");
1885 		goto done;
1886 	}
1887 
1888 	s->thread_args.commits_needed = view->nlines;
1889 	s->thread_args.graph = thread_graph;
1890 	s->thread_args.commits = &s->commits;
1891 	s->thread_args.in_repo_path = s->in_repo_path;
1892 	s->thread_args.start_id = s->start_id;
1893 	s->thread_args.repo = thread_repo;
1894 	s->thread_args.log_complete = 0;
1895 	s->thread_args.quit = &s->quit;
1896 	s->thread_args.view = view;
1897 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1898 	s->thread_args.selected_entry = &s->selected_entry;
1899 done:
1900 	if (err)
1901 		close_log_view(view);
1902 	return err;
1903 }
1904 
1905 static const struct got_error *
1906 show_log_view(struct tog_view *view)
1907 {
1908 	struct tog_log_view_state *s = &view->state.log;
1909 
1910 	if (s->thread == NULL) {
1911 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1912 		    &s->thread_args);
1913 		if (errcode)
1914 			return got_error_set_errno(errcode, "pthread_create");
1915 	}
1916 
1917 	return draw_commits(view, &s->last_displayed_entry,
1918 	    &s->selected_entry, s->first_displayed_entry,
1919 	    &s->commits, s->selected, view->nlines, s->refs,
1920 	    s->in_repo_path, s->thread_args.commits_needed);
1921 }
1922 
1923 static const struct got_error *
1924 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1925     struct tog_view **focus_view, struct tog_view *view, int ch)
1926 {
1927 	const struct got_error *err = NULL;
1928 	struct tog_log_view_state *s = &view->state.log;
1929 	char *parent_path, *in_repo_path = NULL;
1930 	struct tog_view *diff_view = NULL, *tree_view = NULL, *lv = NULL;
1931 	int begin_x = 0;
1932 	struct got_object_id *start_id;
1933 
1934 	switch (ch) {
1935 	case 'q':
1936 		s->quit = 1;
1937 		break;
1938 	case 'k':
1939 	case KEY_UP:
1940 	case '<':
1941 	case ',':
1942 		if (s->first_displayed_entry == NULL)
1943 			break;
1944 		if (s->selected > 0)
1945 			s->selected--;
1946 		else
1947 			scroll_up(view, &s->first_displayed_entry, 1,
1948 			    &s->commits);
1949 		break;
1950 	case KEY_PPAGE:
1951 	case CTRL('b'):
1952 		if (s->first_displayed_entry == NULL)
1953 			break;
1954 		if (TAILQ_FIRST(&s->commits.head) ==
1955 		    s->first_displayed_entry) {
1956 			s->selected = 0;
1957 			break;
1958 		}
1959 		scroll_up(view, &s->first_displayed_entry,
1960 		    view->nlines, &s->commits);
1961 		break;
1962 	case 'j':
1963 	case KEY_DOWN:
1964 	case '>':
1965 	case '.':
1966 		if (s->first_displayed_entry == NULL)
1967 			break;
1968 		if (s->selected < MIN(view->nlines - 2,
1969 		    s->commits.ncommits - 1)) {
1970 			s->selected++;
1971 			break;
1972 		}
1973 		err = scroll_down(view, &s->first_displayed_entry, 1,
1974 		    &s->last_displayed_entry, &s->commits,
1975 		    &s->thread_args.log_complete,
1976 		    &s->thread_args.commits_needed,
1977 		    &s->thread_args.need_commits);
1978 		break;
1979 	case KEY_NPAGE:
1980 	case CTRL('f'): {
1981 		struct commit_queue_entry *first;
1982 		first = s->first_displayed_entry;
1983 		if (first == NULL)
1984 			break;
1985 		err = scroll_down(view, &s->first_displayed_entry,
1986 		    view->nlines, &s->last_displayed_entry,
1987 		    &s->commits, &s->thread_args.log_complete,
1988 		    &s->thread_args.commits_needed,
1989 		    &s->thread_args.need_commits);
1990 		if (first == s->first_displayed_entry &&
1991 		    s->selected < MIN(view->nlines - 2,
1992 		    s->commits.ncommits - 1)) {
1993 			/* can't scroll further down */
1994 			s->selected = MIN(view->nlines - 2,
1995 			    s->commits.ncommits - 1);
1996 		}
1997 		err = NULL;
1998 		break;
1999 	}
2000 	case KEY_RESIZE:
2001 		if (s->selected > view->nlines - 2)
2002 			s->selected = view->nlines - 2;
2003 		if (s->selected > s->commits.ncommits - 1)
2004 			s->selected = s->commits.ncommits - 1;
2005 		break;
2006 	case KEY_ENTER:
2007 	case ' ':
2008 	case '\r':
2009 		if (s->selected_entry == NULL)
2010 			break;
2011 		if (view_is_parent_view(view))
2012 			begin_x = view_split_begin_x(view->begin_x);
2013 		err = open_diff_view_for_commit(&diff_view, begin_x,
2014 		    s->selected_entry->commit, s->selected_entry->id,
2015 		    view, s->refs, s->repo);
2016 		if (err)
2017 			break;
2018 		if (view_is_parent_view(view)) {
2019 			err = view_close_child(view);
2020 			if (err)
2021 				return err;
2022 			err = view_set_child(view, diff_view);
2023 			if (err) {
2024 				view_close(diff_view);
2025 				break;
2026 			}
2027 			*focus_view = diff_view;
2028 			view->child_focussed = 1;
2029 		} else
2030 			*new_view = diff_view;
2031 		break;
2032 	case 't':
2033 		if (s->selected_entry == NULL)
2034 			break;
2035 		if (view_is_parent_view(view))
2036 			begin_x = view_split_begin_x(view->begin_x);
2037 		err = browse_commit_tree(&tree_view, begin_x,
2038 		    s->selected_entry, s->in_repo_path, s->refs, s->repo);
2039 		if (err)
2040 			break;
2041 		if (view_is_parent_view(view)) {
2042 			err = view_close_child(view);
2043 			if (err)
2044 				return err;
2045 			err = view_set_child(view, tree_view);
2046 			if (err) {
2047 				view_close(tree_view);
2048 				break;
2049 			}
2050 			*focus_view = tree_view;
2051 			view->child_focussed = 1;
2052 		} else
2053 			*new_view = tree_view;
2054 		break;
2055 	case KEY_BACKSPACE:
2056 		if (strcmp(s->in_repo_path, "/") == 0)
2057 			break;
2058 		parent_path = dirname(s->in_repo_path);
2059 		if (parent_path && strcmp(parent_path, ".") != 0) {
2060 			err = stop_log_thread(s);
2061 			if (err)
2062 				return err;
2063 			lv = view_open(view->nlines, view->ncols,
2064 			    view->begin_y, view->begin_x, TOG_VIEW_LOG);
2065 			if (lv == NULL)
2066 				return got_error_from_errno(
2067 				    "view_open");
2068 			err = open_log_view(lv, s->start_id, s->refs,
2069 			    s->repo, s->head_ref_name, parent_path, 0);
2070 			if (err)
2071 				return err;;
2072 			if (view_is_parent_view(view))
2073 				*new_view = lv;
2074 			else {
2075 				view_set_child(view->parent, lv);
2076 				*focus_view = lv;
2077 			}
2078 			return NULL;
2079 		}
2080 		break;
2081 	case CTRL('l'):
2082 		err = stop_log_thread(s);
2083 		if (err)
2084 			return err;
2085 		lv = view_open(view->nlines, view->ncols,
2086 		    view->begin_y, view->begin_x, TOG_VIEW_LOG);
2087 		if (lv == NULL)
2088 			return got_error_from_errno("view_open");
2089 		err = get_head_commit_id(&start_id, s->head_ref_name ?
2090 		    s->head_ref_name : GOT_REF_HEAD, s->repo);
2091 		if (err) {
2092 			view_close(lv);
2093 			return err;
2094 		}
2095 		in_repo_path = strdup(s->in_repo_path);
2096 		if (in_repo_path == NULL) {
2097 			free(start_id);
2098 			view_close(lv);
2099 			return got_error_from_errno("strdup");
2100 		}
2101 		err = open_log_view(lv, start_id, s->refs, s->repo,
2102 		    s->head_ref_name, in_repo_path, 0);
2103 		if (err) {
2104 			free(start_id);
2105 			view_close(lv);
2106 			return err;;
2107 		}
2108 		*dead_view = view;
2109 		*new_view = lv;
2110 		break;
2111 	default:
2112 		break;
2113 	}
2114 
2115 	return err;
2116 }
2117 
2118 static const struct got_error *
2119 apply_unveil(const char *repo_path, const char *worktree_path)
2120 {
2121 	const struct got_error *error;
2122 
2123 #ifdef PROFILE
2124 	if (unveil("gmon.out", "rwc") != 0)
2125 		return got_error_from_errno2("unveil", "gmon.out");
2126 #endif
2127 	if (repo_path && unveil(repo_path, "r") != 0)
2128 		return got_error_from_errno2("unveil", repo_path);
2129 
2130 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
2131 		return got_error_from_errno2("unveil", worktree_path);
2132 
2133 	if (unveil("/tmp", "rwc") != 0)
2134 		return got_error_from_errno2("unveil", "/tmp");
2135 
2136 	error = got_privsep_unveil_exec_helpers();
2137 	if (error != NULL)
2138 		return error;
2139 
2140 	if (unveil(NULL, NULL) != 0)
2141 		return got_error_from_errno("unveil");
2142 
2143 	return NULL;
2144 }
2145 
2146 static void
2147 init_curses(void)
2148 {
2149 	initscr();
2150 	cbreak();
2151 	halfdelay(1); /* Do fast refresh while initial view is loading. */
2152 	noecho();
2153 	nonl();
2154 	intrflush(stdscr, FALSE);
2155 	keypad(stdscr, TRUE);
2156 	curs_set(0);
2157 	signal(SIGWINCH, tog_sigwinch);
2158 }
2159 
2160 static const struct got_error *
2161 cmd_log(int argc, char *argv[])
2162 {
2163 	const struct got_error *error;
2164 	struct got_repository *repo = NULL;
2165 	struct got_worktree *worktree = NULL;
2166 	struct got_reflist_head refs;
2167 	struct got_object_id *start_id = NULL;
2168 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
2169 	char *start_commit = NULL;
2170 	int ch;
2171 	struct tog_view *view;
2172 
2173 	SIMPLEQ_INIT(&refs);
2174 
2175 #ifndef PROFILE
2176 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2177 	    NULL) == -1)
2178 		err(1, "pledge");
2179 #endif
2180 
2181 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
2182 		switch (ch) {
2183 		case 'c':
2184 			start_commit = optarg;
2185 			break;
2186 		case 'r':
2187 			repo_path = realpath(optarg, NULL);
2188 			if (repo_path == NULL)
2189 				err(1, "-r option");
2190 			break;
2191 		default:
2192 			usage_log();
2193 			/* NOTREACHED */
2194 		}
2195 	}
2196 
2197 	argc -= optind;
2198 	argv += optind;
2199 
2200 	cwd = getcwd(NULL, 0);
2201 	if (cwd == NULL) {
2202 		error = got_error_from_errno("getcwd");
2203 		goto done;
2204 	}
2205 	error = got_worktree_open(&worktree, cwd);
2206 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
2207 		goto done;
2208 	error = NULL;
2209 
2210 	if (argc == 0) {
2211 		path = strdup("");
2212 		if (path == NULL) {
2213 			error = got_error_from_errno("strdup");
2214 			goto done;
2215 		}
2216 	} else if (argc == 1) {
2217 		if (worktree) {
2218 			error = got_worktree_resolve_path(&path, worktree,
2219 			    argv[0]);
2220 			if (error)
2221 				goto done;
2222 		} else {
2223 			path = strdup(argv[0]);
2224 			if (path == NULL) {
2225 				error = got_error_from_errno("strdup");
2226 				goto done;
2227 			}
2228 		}
2229 	} else
2230 		usage_log();
2231 
2232 	repo_path = worktree ?
2233 	    strdup(got_worktree_get_repo_path(worktree)) : strdup(cwd);
2234 	if (repo_path == NULL) {
2235 		error = got_error_from_errno("strdup");
2236 		goto done;
2237 	}
2238 
2239 	init_curses();
2240 
2241 	error = got_repo_open(&repo, repo_path);
2242 	if (error != NULL)
2243 		goto done;
2244 
2245 	error = apply_unveil(got_repo_get_path(repo),
2246 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
2247 	if (error)
2248 		goto done;
2249 
2250 	if (start_commit == NULL)
2251 		error = get_head_commit_id(&start_id, worktree ?
2252 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
2253 		    repo);
2254 	else {
2255 		error = get_head_commit_id(&start_id, start_commit, repo);
2256 		if (error) {
2257 			if (error->code != GOT_ERR_NOT_REF)
2258 				goto done;
2259 			error = got_repo_match_object_id_prefix(&start_id,
2260 			    start_commit, GOT_OBJ_TYPE_COMMIT, repo);
2261 		}
2262 	}
2263 	if (error != NULL)
2264 		goto done;
2265 
2266 	error = got_ref_list(&refs, repo);
2267 	if (error)
2268 		goto done;
2269 
2270 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
2271 	if (view == NULL) {
2272 		error = got_error_from_errno("view_open");
2273 		goto done;
2274 	}
2275 	error = open_log_view(view, start_id, &refs, repo, worktree ?
2276 	    got_worktree_get_head_ref_name(worktree) : NULL, path, 1);
2277 	if (error)
2278 		goto done;
2279 	error = view_loop(view);
2280 done:
2281 	free(repo_path);
2282 	free(cwd);
2283 	free(path);
2284 	free(start_id);
2285 	if (repo)
2286 		got_repo_close(repo);
2287 	if (worktree)
2288 		got_worktree_close(worktree);
2289 	got_ref_list_free(&refs);
2290 	return error;
2291 }
2292 
2293 __dead static void
2294 usage_diff(void)
2295 {
2296 	endwin();
2297 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
2298 	    getprogname());
2299 	exit(1);
2300 }
2301 
2302 static char *
2303 parse_next_line(FILE *f, size_t *len)
2304 {
2305 	char *line;
2306 	size_t linelen;
2307 	size_t lineno;
2308 	const char delim[3] = { '\0', '\0', '\0'};
2309 
2310 	line = fparseln(f, &linelen, &lineno, delim, 0);
2311 	if (len)
2312 		*len = linelen;
2313 	return line;
2314 }
2315 
2316 static const struct got_error *
2317 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
2318     int *last_displayed_line, int *eof, int max_lines,
2319     char *header)
2320 {
2321 	const struct got_error *err;
2322 	int nlines = 0, nprinted = 0;
2323 	char *line;
2324 	size_t len;
2325 	wchar_t *wline;
2326 	int width;
2327 
2328 	rewind(f);
2329 	werase(view->window);
2330 
2331 	if (header) {
2332 		err = format_line(&wline, &width, header, view->ncols);
2333 		if (err) {
2334 			return err;
2335 		}
2336 
2337 		if (view_needs_focus_indication(view))
2338 			wstandout(view->window);
2339 		waddwstr(view->window, wline);
2340 		if (view_needs_focus_indication(view))
2341 			wstandend(view->window);
2342 		if (width < view->ncols - 1)
2343 			waddch(view->window, '\n');
2344 
2345 		if (max_lines <= 1)
2346 			return NULL;
2347 		max_lines--;
2348 	}
2349 
2350 	*eof = 0;
2351 	while (nprinted < max_lines) {
2352 		line = parse_next_line(f, &len);
2353 		if (line == NULL) {
2354 			*eof = 1;
2355 			break;
2356 		}
2357 		if (++nlines < *first_displayed_line) {
2358 			free(line);
2359 			continue;
2360 		}
2361 
2362 		err = format_line(&wline, &width, line, view->ncols);
2363 		if (err) {
2364 			free(line);
2365 			return err;
2366 		}
2367 		waddwstr(view->window, wline);
2368 		if (width < view->ncols - 1)
2369 			waddch(view->window, '\n');
2370 		if (++nprinted == 1)
2371 			*first_displayed_line = nlines;
2372 		free(line);
2373 		free(wline);
2374 		wline = NULL;
2375 	}
2376 	*last_displayed_line = nlines;
2377 
2378 	view_vborder(view);
2379 
2380 	if (*eof) {
2381 		while (nprinted < view->nlines) {
2382 			waddch(view->window, '\n');
2383 			nprinted++;
2384 		}
2385 
2386 		err = format_line(&wline, &width, TOG_EOF_STRING, view->ncols);
2387 		if (err) {
2388 			return err;
2389 		}
2390 
2391 		wstandout(view->window);
2392 		waddwstr(view->window, wline);
2393 		wstandend(view->window);
2394 	}
2395 
2396 	return NULL;
2397 }
2398 
2399 static char *
2400 get_datestr(time_t *time, char *datebuf)
2401 {
2402 	char *p, *s = ctime_r(time, datebuf);
2403 	p = strchr(s, '\n');
2404 	if (p)
2405 		*p = '\0';
2406 	return s;
2407 }
2408 
2409 static const struct got_error *
2410 write_commit_info(struct got_object_id *commit_id,
2411     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2412 {
2413 	const struct got_error *err = NULL;
2414 	char datebuf[26];
2415 	struct got_commit_object *commit;
2416 	char *id_str = NULL;
2417 	time_t committer_time;
2418 	const char *author, *committer;
2419 	char *refs_str = NULL;
2420 
2421 	if (refs) {
2422 		err = build_refs_str(&refs_str, refs, commit_id);
2423 		if (err)
2424 			return err;
2425 	}
2426 
2427 	err = got_object_open_as_commit(&commit, repo, commit_id);
2428 	if (err)
2429 		return err;
2430 
2431 	err = got_object_id_str(&id_str, commit_id);
2432 	if (err) {
2433 		err = got_error_from_errno("got_object_id_str");
2434 		goto done;
2435 	}
2436 
2437 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2438 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2439 		err = got_error_from_errno("fprintf");
2440 		goto done;
2441 	}
2442 	if (fprintf(outfile, "from: %s\n",
2443 	    got_object_commit_get_author(commit)) < 0) {
2444 		err = got_error_from_errno("fprintf");
2445 		goto done;
2446 	}
2447 	committer_time = got_object_commit_get_committer_time(commit);
2448 	if (fprintf(outfile, "date: %s UTC\n",
2449 	    get_datestr(&committer_time, datebuf)) < 0) {
2450 		err = got_error_from_errno("fprintf");
2451 		goto done;
2452 	}
2453 	author = got_object_commit_get_author(commit);
2454 	committer = got_object_commit_get_committer(commit);
2455 	if (strcmp(author, committer) != 0 &&
2456 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2457 		err = got_error_from_errno("fprintf");
2458 		goto done;
2459 	}
2460 	if (fprintf(outfile, "%s\n",
2461 	    got_object_commit_get_logmsg(commit)) < 0) {
2462 		err = got_error_from_errno("fprintf");
2463 		goto done;
2464 	}
2465 done:
2466 	free(id_str);
2467 	free(refs_str);
2468 	got_object_commit_close(commit);
2469 	return err;
2470 }
2471 
2472 static const struct got_error *
2473 create_diff(struct tog_diff_view_state *s)
2474 {
2475 	const struct got_error *err = NULL;
2476 	FILE *f = NULL;
2477 	int obj_type;
2478 
2479 	f = got_opentemp();
2480 	if (f == NULL) {
2481 		err = got_error_from_errno("got_opentemp");
2482 		goto done;
2483 	}
2484 	if (s->f && fclose(s->f) != 0) {
2485 		err = got_error_from_errno("fclose");
2486 		goto done;
2487 	}
2488 	s->f = f;
2489 
2490 	if (s->id1)
2491 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2492 	else
2493 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2494 	if (err)
2495 		goto done;
2496 
2497 	switch (obj_type) {
2498 	case GOT_OBJ_TYPE_BLOB:
2499 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2500 		    s->diff_context, s->repo, f);
2501 		break;
2502 	case GOT_OBJ_TYPE_TREE:
2503 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2504 		    s->diff_context, s->repo, f);
2505 		break;
2506 	case GOT_OBJ_TYPE_COMMIT: {
2507 		const struct got_object_id_queue *parent_ids;
2508 		struct got_object_qid *pid;
2509 		struct got_commit_object *commit2;
2510 
2511 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2512 		if (err)
2513 			break;
2514 		/* Show commit info if we're diffing to a parent/root commit. */
2515 		if (s->id1 == NULL)
2516 			write_commit_info(s->id2, s->refs, s->repo, f);
2517 		else {
2518 			parent_ids = got_object_commit_get_parent_ids(commit2);
2519 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2520 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2521 					write_commit_info(s->id2, s->refs,
2522 					    s->repo, f);
2523 					break;
2524 				}
2525 			}
2526 		}
2527 		got_object_commit_close(commit2);
2528 
2529 		err = got_diff_objects_as_commits(s->id1, s->id2,
2530 		    s->diff_context, s->repo, f);
2531 		break;
2532 	}
2533 	default:
2534 		err = got_error(GOT_ERR_OBJ_TYPE);
2535 		break;
2536 	}
2537 done:
2538 	if (f && fflush(f) != 0 && err == NULL)
2539 		err = got_error_from_errno("fflush");
2540 	return err;
2541 }
2542 
2543 static void
2544 diff_view_indicate_progress(struct tog_view *view)
2545 {
2546 	mvwaddstr(view->window, 0, 0, "diffing...");
2547 	update_panels();
2548 	doupdate();
2549 }
2550 
2551 static const struct got_error *
2552 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2553     struct got_object_id *id2, struct tog_view *log_view,
2554     struct got_reflist_head *refs, struct got_repository *repo)
2555 {
2556 	const struct got_error *err;
2557 
2558 	if (id1 != NULL && id2 != NULL) {
2559 	    int type1, type2;
2560 	    err = got_object_get_type(&type1, repo, id1);
2561 	    if (err)
2562 		return err;
2563 	    err = got_object_get_type(&type2, repo, id2);
2564 	    if (err)
2565 		return err;
2566 
2567 	    if (type1 != type2)
2568 		return got_error(GOT_ERR_OBJ_TYPE);
2569 	}
2570 
2571 	if (id1) {
2572 		view->state.diff.id1 = got_object_id_dup(id1);
2573 		if (view->state.diff.id1 == NULL)
2574 			return got_error_from_errno("got_object_id_dup");
2575 	} else
2576 		view->state.diff.id1 = NULL;
2577 
2578 	view->state.diff.id2 = got_object_id_dup(id2);
2579 	if (view->state.diff.id2 == NULL) {
2580 		free(view->state.diff.id1);
2581 		view->state.diff.id1 = NULL;
2582 		return got_error_from_errno("got_object_id_dup");
2583 	}
2584 	view->state.diff.f = NULL;
2585 	view->state.diff.first_displayed_line = 1;
2586 	view->state.diff.last_displayed_line = view->nlines;
2587 	view->state.diff.diff_context = 3;
2588 	view->state.diff.log_view = log_view;
2589 	view->state.diff.repo = repo;
2590 	view->state.diff.refs = refs;
2591 
2592 	if (log_view && view_is_splitscreen(view))
2593 		show_log_view(log_view); /* draw vborder */
2594 	diff_view_indicate_progress(view);
2595 
2596 	err = create_diff(&view->state.diff);
2597 	if (err) {
2598 		free(view->state.diff.id1);
2599 		view->state.diff.id1 = NULL;
2600 		free(view->state.diff.id2);
2601 		view->state.diff.id2 = NULL;
2602 		return err;
2603 	}
2604 
2605 	view->show = show_diff_view;
2606 	view->input = input_diff_view;
2607 	view->close = close_diff_view;
2608 
2609 	return NULL;
2610 }
2611 
2612 static const struct got_error *
2613 close_diff_view(struct tog_view *view)
2614 {
2615 	const struct got_error *err = NULL;
2616 
2617 	free(view->state.diff.id1);
2618 	view->state.diff.id1 = NULL;
2619 	free(view->state.diff.id2);
2620 	view->state.diff.id2 = NULL;
2621 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2622 		err = got_error_from_errno("fclose");
2623 	return err;
2624 }
2625 
2626 static const struct got_error *
2627 show_diff_view(struct tog_view *view)
2628 {
2629 	const struct got_error *err;
2630 	struct tog_diff_view_state *s = &view->state.diff;
2631 	char *id_str1 = NULL, *id_str2, *header;
2632 
2633 	if (s->id1) {
2634 		err = got_object_id_str(&id_str1, s->id1);
2635 		if (err)
2636 			return err;
2637 	}
2638 	err = got_object_id_str(&id_str2, s->id2);
2639 	if (err)
2640 		return err;
2641 
2642 	if (asprintf(&header, "diff %s %s",
2643 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2644 		err = got_error_from_errno("asprintf");
2645 		free(id_str1);
2646 		free(id_str2);
2647 		return err;
2648 	}
2649 	free(id_str1);
2650 	free(id_str2);
2651 
2652 	return draw_file(view, s->f, &s->first_displayed_line,
2653 	    &s->last_displayed_line, &s->eof, view->nlines,
2654 	    header);
2655 }
2656 
2657 static const struct got_error *
2658 set_selected_commit(struct tog_diff_view_state *s,
2659     struct commit_queue_entry *entry)
2660 {
2661 	const struct got_error *err;
2662 	const struct got_object_id_queue *parent_ids;
2663 	struct got_commit_object *selected_commit;
2664 	struct got_object_qid *pid;
2665 
2666 	free(s->id2);
2667 	s->id2 = got_object_id_dup(entry->id);
2668 	if (s->id2 == NULL)
2669 		return got_error_from_errno("got_object_id_dup");
2670 
2671 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2672 	if (err)
2673 		return err;
2674 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2675 	free(s->id1);
2676 	pid = SIMPLEQ_FIRST(parent_ids);
2677 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2678 	got_object_commit_close(selected_commit);
2679 	return NULL;
2680 }
2681 
2682 static const struct got_error *
2683 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2684     struct tog_view **focus_view, struct tog_view *view, int ch)
2685 {
2686 	const struct got_error *err = NULL;
2687 	struct tog_diff_view_state *s = &view->state.diff;
2688 	struct tog_log_view_state *ls;
2689 	struct commit_queue_entry *entry;
2690 	int i;
2691 
2692 	switch (ch) {
2693 	case 'k':
2694 	case KEY_UP:
2695 		if (s->first_displayed_line > 1)
2696 			s->first_displayed_line--;
2697 		break;
2698 	case KEY_PPAGE:
2699 	case CTRL('b'):
2700 		if (s->first_displayed_line == 1)
2701 			break;
2702 		i = 0;
2703 		while (i++ < view->nlines - 1 &&
2704 		    s->first_displayed_line > 1)
2705 			s->first_displayed_line--;
2706 		break;
2707 	case 'j':
2708 	case KEY_DOWN:
2709 		if (!s->eof)
2710 			s->first_displayed_line++;
2711 		break;
2712 	case KEY_NPAGE:
2713 	case CTRL('f'):
2714 	case ' ':
2715 		if (s->eof)
2716 			break;
2717 		i = 0;
2718 		while (!s->eof && i++ < view->nlines - 1) {
2719 			char *line;
2720 			line = parse_next_line(s->f, NULL);
2721 			s->first_displayed_line++;
2722 			if (line == NULL)
2723 				break;
2724 		}
2725 		break;
2726 	case '[':
2727 		if (s->diff_context > 0) {
2728 			s->diff_context--;
2729 			diff_view_indicate_progress(view);
2730 			err = create_diff(s);
2731 		}
2732 		break;
2733 	case ']':
2734 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2735 			s->diff_context++;
2736 			diff_view_indicate_progress(view);
2737 			err = create_diff(s);
2738 		}
2739 		break;
2740 	case '<':
2741 	case ',':
2742 		if (s->log_view == NULL)
2743 			break;
2744 		ls = &s->log_view->state.log;
2745 		entry = TAILQ_PREV(ls->selected_entry,
2746 		    commit_queue_head, entry);
2747 		if (entry == NULL)
2748 			break;
2749 
2750 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2751 		    KEY_UP);
2752 		if (err)
2753 			break;
2754 
2755 		err = set_selected_commit(s, entry);
2756 		if (err)
2757 			break;
2758 
2759 		s->first_displayed_line = 1;
2760 		s->last_displayed_line = view->nlines;
2761 
2762 		diff_view_indicate_progress(view);
2763 		err = create_diff(s);
2764 		break;
2765 	case '>':
2766 	case '.':
2767 		if (s->log_view == NULL)
2768 			break;
2769 		ls = &s->log_view->state.log;
2770 
2771 		if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2772 			ls->thread_args.commits_needed++;
2773 
2774 			/* Display "loading..." in log view. */
2775 			show_log_view(s->log_view);
2776 			update_panels();
2777 			doupdate();
2778 
2779 			err = trigger_log_thread(1 /* load_all */,
2780 			    &ls->thread_args.commits_needed,
2781 			    &ls->thread_args.log_complete,
2782 			    &ls->thread_args.need_commits);
2783 			if (err)
2784 				break;
2785 		}
2786 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2787 		    KEY_DOWN);
2788 		if (err)
2789 			break;
2790 
2791 		entry = TAILQ_NEXT(ls->selected_entry, entry);
2792 		if (entry == NULL)
2793 			break;
2794 
2795 		err = set_selected_commit(s, entry);
2796 		if (err)
2797 			break;
2798 
2799 		s->first_displayed_line = 1;
2800 		s->last_displayed_line = view->nlines;
2801 
2802 		diff_view_indicate_progress(view);
2803 		err = create_diff(s);
2804 		break;
2805 	default:
2806 		break;
2807 	}
2808 
2809 	return err;
2810 }
2811 
2812 static const struct got_error *
2813 cmd_diff(int argc, char *argv[])
2814 {
2815 	const struct got_error *error = NULL;
2816 	struct got_repository *repo = NULL;
2817 	struct got_reflist_head refs;
2818 	struct got_object_id *id1 = NULL, *id2 = NULL;
2819 	char *repo_path = NULL;
2820 	char *id_str1 = NULL, *id_str2 = NULL;
2821 	int ch;
2822 	struct tog_view *view;
2823 
2824 	SIMPLEQ_INIT(&refs);
2825 
2826 #ifndef PROFILE
2827 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2828 	    NULL) == -1)
2829 		err(1, "pledge");
2830 #endif
2831 
2832 	while ((ch = getopt(argc, argv, "")) != -1) {
2833 		switch (ch) {
2834 		default:
2835 			usage_diff();
2836 			/* NOTREACHED */
2837 		}
2838 	}
2839 
2840 	argc -= optind;
2841 	argv += optind;
2842 
2843 	if (argc == 0) {
2844 		usage_diff(); /* TODO show local worktree changes */
2845 	} else if (argc == 2) {
2846 		repo_path = getcwd(NULL, 0);
2847 		if (repo_path == NULL)
2848 			return got_error_from_errno("getcwd");
2849 		id_str1 = argv[0];
2850 		id_str2 = argv[1];
2851 	} else if (argc == 3) {
2852 		repo_path = realpath(argv[0], NULL);
2853 		if (repo_path == NULL)
2854 			return got_error_from_errno2("realpath", argv[0]);
2855 		id_str1 = argv[1];
2856 		id_str2 = argv[2];
2857 	} else
2858 		usage_diff();
2859 
2860 	init_curses();
2861 
2862 	error = got_repo_open(&repo, repo_path);
2863 	if (error)
2864 		goto done;
2865 
2866 	error = apply_unveil(got_repo_get_path(repo), NULL);
2867 	if (error)
2868 		goto done;
2869 
2870 	error = got_repo_match_object_id_prefix(&id1, id_str1,
2871 	    GOT_OBJ_TYPE_ANY, repo);
2872 	if (error)
2873 		goto done;
2874 
2875 	error = got_repo_match_object_id_prefix(&id2, id_str2,
2876 	    GOT_OBJ_TYPE_ANY, repo);
2877 	if (error)
2878 		goto done;
2879 
2880 	error = got_ref_list(&refs, repo);
2881 	if (error)
2882 		goto done;
2883 
2884 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2885 	if (view == NULL) {
2886 		error = got_error_from_errno("view_open");
2887 		goto done;
2888 	}
2889 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2890 	if (error)
2891 		goto done;
2892 	error = view_loop(view);
2893 done:
2894 	free(repo_path);
2895 	if (repo)
2896 		got_repo_close(repo);
2897 	got_ref_list_free(&refs);
2898 	return error;
2899 }
2900 
2901 __dead static void
2902 usage_blame(void)
2903 {
2904 	endwin();
2905 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2906 	    getprogname());
2907 	exit(1);
2908 }
2909 
2910 struct tog_blame_line {
2911 	int annotated;
2912 	struct got_object_id *id;
2913 };
2914 
2915 static const struct got_error *
2916 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2917     const char *path, struct tog_blame_line *lines, int nlines,
2918     int blame_complete, int selected_line, int *first_displayed_line,
2919     int *last_displayed_line, int *eof, int max_lines)
2920 {
2921 	const struct got_error *err;
2922 	int lineno = 0, nprinted = 0;
2923 	char *line;
2924 	size_t len;
2925 	wchar_t *wline;
2926 	int width, wlimit;
2927 	struct tog_blame_line *blame_line;
2928 	struct got_object_id *prev_id = NULL;
2929 	char *id_str;
2930 
2931 	err = got_object_id_str(&id_str, id);
2932 	if (err)
2933 		return err;
2934 
2935 	rewind(f);
2936 	werase(view->window);
2937 
2938 	if (asprintf(&line, "commit %s", id_str) == -1) {
2939 		err = got_error_from_errno("asprintf");
2940 		free(id_str);
2941 		return err;
2942 	}
2943 
2944 	err = format_line(&wline, &width, line, view->ncols);
2945 	free(line);
2946 	line = NULL;
2947 	if (view_needs_focus_indication(view))
2948 		wstandout(view->window);
2949 	waddwstr(view->window, wline);
2950 	if (view_needs_focus_indication(view))
2951 		wstandend(view->window);
2952 	free(wline);
2953 	wline = NULL;
2954 	if (width < view->ncols - 1)
2955 		waddch(view->window, '\n');
2956 
2957 	if (asprintf(&line, "[%d/%d] %s%s",
2958 	    *first_displayed_line - 1 + selected_line, nlines,
2959 	    blame_complete ? "" : "annotating... ", path) == -1) {
2960 		free(id_str);
2961 		return got_error_from_errno("asprintf");
2962 	}
2963 	free(id_str);
2964 	err = format_line(&wline, &width, line, view->ncols);
2965 	free(line);
2966 	line = NULL;
2967 	if (err)
2968 		return err;
2969 	waddwstr(view->window, wline);
2970 	free(wline);
2971 	wline = NULL;
2972 	if (width < view->ncols - 1)
2973 		waddch(view->window, '\n');
2974 
2975 	*eof = 0;
2976 	while (nprinted < max_lines - 2) {
2977 		line = parse_next_line(f, &len);
2978 		if (line == NULL) {
2979 			*eof = 1;
2980 			break;
2981 		}
2982 		if (++lineno < *first_displayed_line) {
2983 			free(line);
2984 			continue;
2985 		}
2986 
2987 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2988 		err = format_line(&wline, &width, line, wlimit);
2989 		if (err) {
2990 			free(line);
2991 			return err;
2992 		}
2993 
2994 		if (view->focussed && nprinted == selected_line - 1)
2995 			wstandout(view->window);
2996 
2997 		blame_line = &lines[lineno - 1];
2998 		if (blame_line->annotated && prev_id &&
2999 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
3000 			waddstr(view->window, "         ");
3001 		else if (blame_line->annotated) {
3002 			char *id_str;
3003 			err = got_object_id_str(&id_str, blame_line->id);
3004 			if (err) {
3005 				free(line);
3006 				free(wline);
3007 				return err;
3008 			}
3009 			wprintw(view->window, "%.8s ", id_str);
3010 			free(id_str);
3011 			prev_id = blame_line->id;
3012 		} else {
3013 			waddstr(view->window, "........ ");
3014 			prev_id = NULL;
3015 		}
3016 
3017 		waddwstr(view->window, wline);
3018 		while (width < wlimit) {
3019 			waddch(view->window, ' ');
3020 			width++;
3021 		}
3022 		if (view->focussed && nprinted == selected_line - 1)
3023 			wstandend(view->window);
3024 		if (++nprinted == 1)
3025 			*first_displayed_line = lineno;
3026 		free(line);
3027 		free(wline);
3028 		wline = NULL;
3029 	}
3030 	*last_displayed_line = lineno;
3031 
3032 	view_vborder(view);
3033 
3034 	return NULL;
3035 }
3036 
3037 static const struct got_error *
3038 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
3039 {
3040 	const struct got_error *err = NULL;
3041 	struct tog_blame_cb_args *a = arg;
3042 	struct tog_blame_line *line;
3043 	int errcode;
3044 
3045 	if (nlines != a->nlines ||
3046 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
3047 		return got_error(GOT_ERR_RANGE);
3048 
3049 	errcode = pthread_mutex_lock(&tog_mutex);
3050 	if (errcode)
3051 		return got_error_set_errno(errcode, "pthread_mutex_lock");
3052 
3053 	if (*a->quit) {	/* user has quit the blame view */
3054 		err = got_error(GOT_ERR_ITER_COMPLETED);
3055 		goto done;
3056 	}
3057 
3058 	if (lineno == -1)
3059 		goto done; /* no change in this commit */
3060 
3061 	line = &a->lines[lineno - 1];
3062 	if (line->annotated)
3063 		goto done;
3064 
3065 	line->id = got_object_id_dup(id);
3066 	if (line->id == NULL) {
3067 		err = got_error_from_errno("got_object_id_dup");
3068 		goto done;
3069 	}
3070 	line->annotated = 1;
3071 done:
3072 	errcode = pthread_mutex_unlock(&tog_mutex);
3073 	if (errcode)
3074 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3075 	return err;
3076 }
3077 
3078 static void *
3079 blame_thread(void *arg)
3080 {
3081 	const struct got_error *err;
3082 	struct tog_blame_thread_args *ta = arg;
3083 	struct tog_blame_cb_args *a = ta->cb_args;
3084 	int errcode;
3085 
3086 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
3087 	    blame_cb, ta->cb_args);
3088 
3089 	errcode = pthread_mutex_lock(&tog_mutex);
3090 	if (errcode)
3091 		return (void *)got_error_set_errno(errcode,
3092 		    "pthread_mutex_lock");
3093 
3094 	got_repo_close(ta->repo);
3095 	ta->repo = NULL;
3096 	*ta->complete = 1;
3097 
3098 	errcode = pthread_mutex_unlock(&tog_mutex);
3099 	if (errcode && err == NULL)
3100 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3101 
3102 	return (void *)err;
3103 }
3104 
3105 static struct got_object_id *
3106 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
3107     int selected_line)
3108 {
3109 	struct tog_blame_line *line;
3110 
3111 	line = &lines[first_displayed_line - 1 + selected_line - 1];
3112 	if (!line->annotated)
3113 		return NULL;
3114 
3115 	return line->id;
3116 }
3117 
3118 static const struct got_error *
3119 stop_blame(struct tog_blame *blame)
3120 {
3121 	const struct got_error *err = NULL;
3122 	int i;
3123 
3124 	if (blame->thread) {
3125 		int errcode;
3126 		errcode = pthread_mutex_unlock(&tog_mutex);
3127 		if (errcode)
3128 			return got_error_set_errno(errcode,
3129 			    "pthread_mutex_unlock");
3130 		errcode = pthread_join(blame->thread, (void **)&err);
3131 		if (errcode)
3132 			return got_error_set_errno(errcode, "pthread_join");
3133 		errcode = pthread_mutex_lock(&tog_mutex);
3134 		if (errcode)
3135 			return got_error_set_errno(errcode,
3136 			    "pthread_mutex_lock");
3137 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
3138 			err = NULL;
3139 		blame->thread = NULL;
3140 	}
3141 	if (blame->thread_args.repo) {
3142 		got_repo_close(blame->thread_args.repo);
3143 		blame->thread_args.repo = NULL;
3144 	}
3145 	if (blame->f) {
3146 		if (fclose(blame->f) != 0 && err == NULL)
3147 			err = got_error_from_errno("fclose");
3148 		blame->f = NULL;
3149 	}
3150 	if (blame->lines) {
3151 		for (i = 0; i < blame->nlines; i++)
3152 			free(blame->lines[i].id);
3153 		free(blame->lines);
3154 		blame->lines = NULL;
3155 	}
3156 	free(blame->cb_args.commit_id);
3157 	blame->cb_args.commit_id = NULL;
3158 
3159 	return err;
3160 }
3161 
3162 static const struct got_error *
3163 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
3164     int *first_displayed_line, int *last_displayed_line, int *selected_line,
3165     int *done, int *eof, const char *path, struct got_object_id *commit_id,
3166     struct got_repository *repo)
3167 {
3168 	const struct got_error *err = NULL;
3169 	struct got_blob_object *blob = NULL;
3170 	struct got_repository *thread_repo = NULL;
3171 	struct got_object_id *obj_id = NULL;
3172 	int obj_type;
3173 
3174 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
3175 	if (err)
3176 		return err;
3177 	if (obj_id == NULL)
3178 		return got_error(GOT_ERR_NO_OBJ);
3179 
3180 	err = got_object_get_type(&obj_type, repo, obj_id);
3181 	if (err)
3182 		goto done;
3183 
3184 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
3185 		err = got_error(GOT_ERR_OBJ_TYPE);
3186 		goto done;
3187 	}
3188 
3189 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
3190 	if (err)
3191 		goto done;
3192 	blame->f = got_opentemp();
3193 	if (blame->f == NULL) {
3194 		err = got_error_from_errno("got_opentemp");
3195 		goto done;
3196 	}
3197 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
3198 	    &blame->line_offsets, blame->f, blob);
3199 	if (err)
3200 		goto done;
3201 
3202 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
3203 	if (blame->lines == NULL) {
3204 		err = got_error_from_errno("calloc");
3205 		goto done;
3206 	}
3207 
3208 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
3209 	if (err)
3210 		goto done;
3211 
3212 	blame->cb_args.view = view;
3213 	blame->cb_args.lines = blame->lines;
3214 	blame->cb_args.nlines = blame->nlines;
3215 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
3216 	if (blame->cb_args.commit_id == NULL) {
3217 		err = got_error_from_errno("got_object_id_dup");
3218 		goto done;
3219 	}
3220 	blame->cb_args.quit = done;
3221 
3222 	blame->thread_args.path = path;
3223 	blame->thread_args.repo = thread_repo;
3224 	blame->thread_args.cb_args = &blame->cb_args;
3225 	blame->thread_args.complete = blame_complete;
3226 	*blame_complete = 0;
3227 
3228 done:
3229 	if (blob)
3230 		got_object_blob_close(blob);
3231 	free(obj_id);
3232 	if (err)
3233 		stop_blame(blame);
3234 	return err;
3235 }
3236 
3237 static const struct got_error *
3238 open_blame_view(struct tog_view *view, char *path,
3239     struct got_object_id *commit_id, struct got_reflist_head *refs,
3240     struct got_repository *repo)
3241 {
3242 	const struct got_error *err = NULL;
3243 	struct tog_blame_view_state *s = &view->state.blame;
3244 
3245 	SIMPLEQ_INIT(&s->blamed_commits);
3246 
3247 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
3248 	if (err)
3249 		return err;
3250 
3251 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
3252 	s->first_displayed_line = 1;
3253 	s->last_displayed_line = view->nlines;
3254 	s->selected_line = 1;
3255 	s->blame_complete = 0;
3256 	s->path = path;
3257 	if (s->path == NULL)
3258 		return got_error_from_errno("open_blame_view");
3259 	s->repo = repo;
3260 	s->refs = refs;
3261 	s->commit_id = commit_id;
3262 	memset(&s->blame, 0, sizeof(s->blame));
3263 
3264 	view->show = show_blame_view;
3265 	view->input = input_blame_view;
3266 	view->close = close_blame_view;
3267 	view->search_start = search_start_blame_view;
3268 	view->search_next = search_next_blame_view;
3269 
3270 	return run_blame(&s->blame, view, &s->blame_complete,
3271 	    &s->first_displayed_line, &s->last_displayed_line,
3272 	    &s->selected_line, &s->done, &s->eof, s->path,
3273 	    s->blamed_commit->id, s->repo);
3274 }
3275 
3276 static const struct got_error *
3277 close_blame_view(struct tog_view *view)
3278 {
3279 	const struct got_error *err = NULL;
3280 	struct tog_blame_view_state *s = &view->state.blame;
3281 
3282 	if (s->blame.thread)
3283 		err = stop_blame(&s->blame);
3284 
3285 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
3286 		struct got_object_qid *blamed_commit;
3287 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
3288 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3289 		got_object_qid_free(blamed_commit);
3290 	}
3291 
3292 	free(s->path);
3293 
3294 	return err;
3295 }
3296 
3297 static const struct got_error *
3298 search_start_blame_view(struct tog_view *view)
3299 {
3300 	struct tog_blame_view_state *s = &view->state.blame;
3301 
3302 	s->matched_line = 0;
3303 	return NULL;
3304 }
3305 
3306 static int
3307 match_line(const char *line, regex_t *regex)
3308 {
3309 	regmatch_t regmatch;
3310 
3311 	return regexec(regex, line, 1, &regmatch, 0) == 0;
3312 }
3313 
3314 
3315 static const struct got_error *
3316 search_next_blame_view(struct tog_view *view)
3317 {
3318 	struct tog_blame_view_state *s = &view->state.blame;
3319 	int lineno;
3320 
3321 	if (!view->searching) {
3322 		view->search_next_done = 1;
3323 		return NULL;
3324 	}
3325 
3326 	if (s->matched_line) {
3327 		if (view->searching == TOG_SEARCH_FORWARD)
3328 			lineno = s->matched_line + 1;
3329 		else
3330 			lineno = s->matched_line - 1;
3331 	} else {
3332 		if (view->searching == TOG_SEARCH_FORWARD)
3333 			lineno = 1;
3334 		else
3335 			lineno = s->blame.nlines;
3336 	}
3337 
3338 	while (1) {
3339 		char *line = NULL;
3340 		off_t offset;
3341 		size_t len;
3342 
3343 		if (lineno <= 0 || lineno > s->blame.nlines) {
3344 			if (s->matched_line == 0) {
3345 				view->search_next_done = 1;
3346 				free(line);
3347 				break;
3348 			}
3349 
3350 			if (view->searching == TOG_SEARCH_FORWARD)
3351 				lineno = 1;
3352 			else
3353 				lineno = s->blame.nlines;
3354 		}
3355 
3356 		offset = s->blame.line_offsets[lineno - 1];
3357 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
3358 			free(line);
3359 			return got_error_from_errno("fseeko");
3360 		}
3361 		free(line);
3362 		line = parse_next_line(s->blame.f, &len);
3363 		if (line && match_line(line, &view->regex)) {
3364 			view->search_next_done = 1;
3365 			s->matched_line = lineno;
3366 			free(line);
3367 			break;
3368 		}
3369 		free(line);
3370 		if (view->searching == TOG_SEARCH_FORWARD)
3371 			lineno++;
3372 		else
3373 			lineno--;
3374 	}
3375 
3376 	if (s->matched_line) {
3377 		s->first_displayed_line = s->matched_line;
3378 		s->selected_line = 1;
3379 	}
3380 
3381 	return NULL;
3382 }
3383 
3384 static const struct got_error *
3385 show_blame_view(struct tog_view *view)
3386 {
3387 	const struct got_error *err = NULL;
3388 	struct tog_blame_view_state *s = &view->state.blame;
3389 	int errcode;
3390 
3391 	if (s->blame.thread == NULL) {
3392 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
3393 		    &s->blame.thread_args);
3394 		if (errcode)
3395 			return got_error_set_errno(errcode, "pthread_create");
3396 	}
3397 
3398 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
3399 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
3400 	    s->selected_line, &s->first_displayed_line,
3401 	    &s->last_displayed_line, &s->eof, view->nlines);
3402 
3403 	view_vborder(view);
3404 	return err;
3405 }
3406 
3407 static const struct got_error *
3408 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
3409     struct tog_view **focus_view, struct tog_view *view, int ch)
3410 {
3411 	const struct got_error *err = NULL, *thread_err = NULL;
3412 	struct tog_view *diff_view;
3413 	struct tog_blame_view_state *s = &view->state.blame;
3414 	int begin_x = 0;
3415 
3416 	switch (ch) {
3417 	case 'q':
3418 		s->done = 1;
3419 		break;
3420 	case 'k':
3421 	case KEY_UP:
3422 		if (s->selected_line > 1)
3423 			s->selected_line--;
3424 		else if (s->selected_line == 1 &&
3425 		    s->first_displayed_line > 1)
3426 			s->first_displayed_line--;
3427 		break;
3428 	case KEY_PPAGE:
3429 		if (s->first_displayed_line == 1) {
3430 			s->selected_line = 1;
3431 			break;
3432 		}
3433 		if (s->first_displayed_line > view->nlines - 2)
3434 			s->first_displayed_line -=
3435 			    (view->nlines - 2);
3436 		else
3437 			s->first_displayed_line = 1;
3438 		break;
3439 	case 'j':
3440 	case KEY_DOWN:
3441 		if (s->selected_line < view->nlines - 2 &&
3442 		    s->first_displayed_line +
3443 		    s->selected_line <= s->blame.nlines)
3444 			s->selected_line++;
3445 		else if (s->last_displayed_line <
3446 		    s->blame.nlines)
3447 			s->first_displayed_line++;
3448 		break;
3449 	case 'b':
3450 	case 'p': {
3451 		struct got_object_id *id = NULL;
3452 		id = get_selected_commit_id(s->blame.lines,
3453 		    s->first_displayed_line, s->selected_line);
3454 		if (id == NULL)
3455 			break;
3456 		if (ch == 'p') {
3457 			struct got_commit_object *commit;
3458 			struct got_object_qid *pid;
3459 			struct got_object_id *blob_id = NULL;
3460 			int obj_type;
3461 			err = got_object_open_as_commit(&commit,
3462 			    s->repo, id);
3463 			if (err)
3464 				break;
3465 			pid = SIMPLEQ_FIRST(
3466 			    got_object_commit_get_parent_ids(commit));
3467 			if (pid == NULL) {
3468 				got_object_commit_close(commit);
3469 				break;
3470 			}
3471 			/* Check if path history ends here. */
3472 			err = got_object_id_by_path(&blob_id, s->repo,
3473 			    pid->id, s->path);
3474 			if (err) {
3475 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
3476 					err = NULL;
3477 				got_object_commit_close(commit);
3478 				break;
3479 			}
3480 			err = got_object_get_type(&obj_type, s->repo,
3481 			    blob_id);
3482 			free(blob_id);
3483 			/* Can't blame non-blob type objects. */
3484 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
3485 				got_object_commit_close(commit);
3486 				break;
3487 			}
3488 			err = got_object_qid_alloc(&s->blamed_commit,
3489 			    pid->id);
3490 			got_object_commit_close(commit);
3491 		} else {
3492 			if (got_object_id_cmp(id,
3493 			    s->blamed_commit->id) == 0)
3494 				break;
3495 			err = got_object_qid_alloc(&s->blamed_commit,
3496 			    id);
3497 		}
3498 		if (err)
3499 			break;
3500 		s->done = 1;
3501 		thread_err = stop_blame(&s->blame);
3502 		s->done = 0;
3503 		if (thread_err)
3504 			break;
3505 		SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3506 		    s->blamed_commit, entry);
3507 		err = run_blame(&s->blame, view, &s->blame_complete,
3508 		    &s->first_displayed_line, &s->last_displayed_line,
3509 		    &s->selected_line, &s->done, &s->eof,
3510 		    s->path, s->blamed_commit->id, s->repo);
3511 		if (err)
3512 			break;
3513 		break;
3514 	}
3515 	case 'B': {
3516 		struct got_object_qid *first;
3517 		first = SIMPLEQ_FIRST(&s->blamed_commits);
3518 		if (!got_object_id_cmp(first->id, s->commit_id))
3519 			break;
3520 		s->done = 1;
3521 		thread_err = stop_blame(&s->blame);
3522 		s->done = 0;
3523 		if (thread_err)
3524 			break;
3525 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3526 		got_object_qid_free(s->blamed_commit);
3527 		s->blamed_commit =
3528 		    SIMPLEQ_FIRST(&s->blamed_commits);
3529 		err = run_blame(&s->blame, view, &s->blame_complete,
3530 		    &s->first_displayed_line, &s->last_displayed_line,
3531 		    &s->selected_line, &s->done, &s->eof, s->path,
3532 		    s->blamed_commit->id, s->repo);
3533 		if (err)
3534 			break;
3535 		break;
3536 	}
3537 	case KEY_ENTER:
3538 	case '\r': {
3539 		struct got_object_id *id = NULL;
3540 		struct got_object_qid *pid;
3541 		struct got_commit_object *commit = NULL;
3542 		id = get_selected_commit_id(s->blame.lines,
3543 		    s->first_displayed_line, s->selected_line);
3544 		if (id == NULL)
3545 			break;
3546 		err = got_object_open_as_commit(&commit, s->repo, id);
3547 		if (err)
3548 			break;
3549 		pid = SIMPLEQ_FIRST(
3550 		    got_object_commit_get_parent_ids(commit));
3551 		if (view_is_parent_view(view))
3552 		    begin_x = view_split_begin_x(view->begin_x);
3553 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3554 		if (diff_view == NULL) {
3555 			got_object_commit_close(commit);
3556 			err = got_error_from_errno("view_open");
3557 			break;
3558 		}
3559 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
3560 		    id, NULL, s->refs, s->repo);
3561 		got_object_commit_close(commit);
3562 		if (err) {
3563 			view_close(diff_view);
3564 			break;
3565 		}
3566 		if (view_is_parent_view(view)) {
3567 			err = view_close_child(view);
3568 			if (err)
3569 				break;
3570 			err = view_set_child(view, diff_view);
3571 			if (err) {
3572 				view_close(diff_view);
3573 				break;
3574 			}
3575 			*focus_view = diff_view;
3576 			view->child_focussed = 1;
3577 		} else
3578 			*new_view = diff_view;
3579 		if (err)
3580 			break;
3581 		break;
3582 	}
3583 	case KEY_NPAGE:
3584 	case ' ':
3585 		if (s->last_displayed_line >= s->blame.nlines &&
3586 		    s->selected_line >= MIN(s->blame.nlines,
3587 		    view->nlines - 2)) {
3588 			break;
3589 		}
3590 		if (s->last_displayed_line >= s->blame.nlines &&
3591 		    s->selected_line < view->nlines - 2) {
3592 			s->selected_line = MIN(s->blame.nlines,
3593 			    view->nlines - 2);
3594 			break;
3595 		}
3596 		if (s->last_displayed_line + view->nlines - 2
3597 		    <= s->blame.nlines)
3598 			s->first_displayed_line +=
3599 			    view->nlines - 2;
3600 		else
3601 			s->first_displayed_line =
3602 			    s->blame.nlines -
3603 			    (view->nlines - 3);
3604 		break;
3605 	case KEY_RESIZE:
3606 		if (s->selected_line > view->nlines - 2) {
3607 			s->selected_line = MIN(s->blame.nlines,
3608 			    view->nlines - 2);
3609 		}
3610 		break;
3611 	default:
3612 		break;
3613 	}
3614 	return thread_err ? thread_err : err;
3615 }
3616 
3617 static const struct got_error *
3618 cmd_blame(int argc, char *argv[])
3619 {
3620 	const struct got_error *error;
3621 	struct got_repository *repo = NULL;
3622 	struct got_reflist_head refs;
3623 	struct got_worktree *worktree = NULL;
3624 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3625 	struct got_object_id *commit_id = NULL;
3626 	char *commit_id_str = NULL;
3627 	int ch;
3628 	struct tog_view *view;
3629 
3630 	SIMPLEQ_INIT(&refs);
3631 
3632 #ifndef PROFILE
3633 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3634 	    NULL) == -1)
3635 		err(1, "pledge");
3636 #endif
3637 
3638 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3639 		switch (ch) {
3640 		case 'c':
3641 			commit_id_str = optarg;
3642 			break;
3643 		case 'r':
3644 			repo_path = realpath(optarg, NULL);
3645 			if (repo_path == NULL)
3646 				err(1, "-r option");
3647 			break;
3648 		default:
3649 			usage_blame();
3650 			/* NOTREACHED */
3651 		}
3652 	}
3653 
3654 	argc -= optind;
3655 	argv += optind;
3656 
3657 	if (argc == 1)
3658 		path = argv[0];
3659 	else
3660 		usage_blame();
3661 
3662 	cwd = getcwd(NULL, 0);
3663 	if (cwd == NULL) {
3664 		error = got_error_from_errno("getcwd");
3665 		goto done;
3666 	}
3667 	if (repo_path == NULL) {
3668 		error = got_worktree_open(&worktree, cwd);
3669 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3670 			goto done;
3671 		else
3672 			error = NULL;
3673 		if (worktree) {
3674 			repo_path =
3675 			    strdup(got_worktree_get_repo_path(worktree));
3676 			if (repo_path == NULL)
3677 				error = got_error_from_errno("strdup");
3678 			if (error)
3679 				goto done;
3680 		} else {
3681 			repo_path = strdup(cwd);
3682 			if (repo_path == NULL) {
3683 				error = got_error_from_errno("strdup");
3684 				goto done;
3685 			}
3686 		}
3687 	}
3688 
3689 	init_curses();
3690 
3691 	error = got_repo_open(&repo, repo_path);
3692 	if (error != NULL)
3693 		goto done;
3694 
3695 	error = apply_unveil(got_repo_get_path(repo), NULL);
3696 	if (error)
3697 		goto done;
3698 
3699 	if (worktree) {
3700 		const char *prefix = got_worktree_get_path_prefix(worktree);
3701 		char *p, *worktree_subdir = cwd +
3702 		    strlen(got_worktree_get_root_path(worktree));
3703 		if (asprintf(&p, "%s%s%s%s%s",
3704 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3705 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3706 		    path) == -1) {
3707 			error = got_error_from_errno("asprintf");
3708 			goto done;
3709 		}
3710 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3711 		free(p);
3712 	} else {
3713 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3714 	}
3715 	if (error)
3716 		goto done;
3717 
3718 	if (commit_id_str == NULL) {
3719 		struct got_reference *head_ref;
3720 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0);
3721 		if (error != NULL)
3722 			goto done;
3723 		error = got_ref_resolve(&commit_id, repo, head_ref);
3724 		got_ref_close(head_ref);
3725 	} else {
3726 		error = get_head_commit_id(&commit_id, commit_id_str, repo);
3727 		if (error) {
3728 			if (error->code != GOT_ERR_NOT_REF)
3729 				goto done;
3730 			error = got_repo_match_object_id_prefix(&commit_id,
3731 			    commit_id_str, GOT_OBJ_TYPE_COMMIT, repo);
3732 		}
3733 	}
3734 	if (error != NULL)
3735 		goto done;
3736 
3737 	error = got_ref_list(&refs, repo);
3738 	if (error)
3739 		goto done;
3740 
3741 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3742 	if (view == NULL) {
3743 		error = got_error_from_errno("view_open");
3744 		goto done;
3745 	}
3746 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3747 	if (error)
3748 		goto done;
3749 	error = view_loop(view);
3750 done:
3751 	free(repo_path);
3752 	free(cwd);
3753 	free(commit_id);
3754 	if (worktree)
3755 		got_worktree_close(worktree);
3756 	if (repo)
3757 		got_repo_close(repo);
3758 	got_ref_list_free(&refs);
3759 	return error;
3760 }
3761 
3762 static const struct got_error *
3763 draw_tree_entries(struct tog_view *view,
3764     struct got_tree_entry **first_displayed_entry,
3765     struct got_tree_entry **last_displayed_entry,
3766     struct got_tree_entry **selected_entry, int *ndisplayed,
3767     const char *label, int show_ids, const char *parent_path,
3768     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3769 {
3770 	const struct got_error *err = NULL;
3771 	struct got_tree_entry *te;
3772 	wchar_t *wline;
3773 	int width, n;
3774 
3775 	*ndisplayed = 0;
3776 
3777 	werase(view->window);
3778 
3779 	if (limit == 0)
3780 		return NULL;
3781 
3782 	err = format_line(&wline, &width, label, view->ncols);
3783 	if (err)
3784 		return err;
3785 	if (view_needs_focus_indication(view))
3786 		wstandout(view->window);
3787 	waddwstr(view->window, wline);
3788 	if (view_needs_focus_indication(view))
3789 		wstandend(view->window);
3790 	free(wline);
3791 	wline = NULL;
3792 	if (width < view->ncols - 1)
3793 		waddch(view->window, '\n');
3794 	if (--limit <= 0)
3795 		return NULL;
3796 	err = format_line(&wline, &width, parent_path, view->ncols);
3797 	if (err)
3798 		return err;
3799 	waddwstr(view->window, wline);
3800 	free(wline);
3801 	wline = NULL;
3802 	if (width < view->ncols - 1)
3803 		waddch(view->window, '\n');
3804 	if (--limit <= 0)
3805 		return NULL;
3806 	waddch(view->window, '\n');
3807 	if (--limit <= 0)
3808 		return NULL;
3809 
3810 	te = SIMPLEQ_FIRST(&entries->head);
3811 	if (*first_displayed_entry == NULL) {
3812 		if (selected == 0) {
3813 			if (view->focussed)
3814 				wstandout(view->window);
3815 			*selected_entry = NULL;
3816 		}
3817 		waddstr(view->window, "  ..\n");	/* parent directory */
3818 		if (selected == 0 && view->focussed)
3819 			wstandend(view->window);
3820 		(*ndisplayed)++;
3821 		if (--limit <= 0)
3822 			return NULL;
3823 		n = 1;
3824 	} else {
3825 		n = 0;
3826 		while (te != *first_displayed_entry)
3827 			te = SIMPLEQ_NEXT(te, entry);
3828 	}
3829 
3830 	while (te) {
3831 		char *line = NULL, *id_str = NULL;
3832 
3833 		if (show_ids) {
3834 			err = got_object_id_str(&id_str, te->id);
3835 			if (err)
3836 				return got_error_from_errno(
3837 				    "got_object_id_str");
3838 		}
3839 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3840 		    te->name, S_ISDIR(te->mode) ? "/" :
3841 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3842 			free(id_str);
3843 			return got_error_from_errno("asprintf");
3844 		}
3845 		free(id_str);
3846 		err = format_line(&wline, &width, line, view->ncols);
3847 		if (err) {
3848 			free(line);
3849 			break;
3850 		}
3851 		if (n == selected) {
3852 			if (view->focussed)
3853 				wstandout(view->window);
3854 			*selected_entry = te;
3855 		}
3856 		waddwstr(view->window, wline);
3857 		if (width < view->ncols - 1)
3858 			waddch(view->window, '\n');
3859 		if (n == selected && view->focussed)
3860 			wstandend(view->window);
3861 		free(line);
3862 		free(wline);
3863 		wline = NULL;
3864 		n++;
3865 		(*ndisplayed)++;
3866 		*last_displayed_entry = te;
3867 		if (--limit <= 0)
3868 			break;
3869 		te = SIMPLEQ_NEXT(te, entry);
3870 	}
3871 
3872 	return err;
3873 }
3874 
3875 static void
3876 tree_scroll_up(struct tog_view *view,
3877     struct got_tree_entry **first_displayed_entry, int maxscroll,
3878     const struct got_tree_entries *entries, int isroot)
3879 {
3880 	struct got_tree_entry *te, *prev;
3881 	int i;
3882 
3883 	if (*first_displayed_entry == NULL)
3884 		return;
3885 
3886 	te = SIMPLEQ_FIRST(&entries->head);
3887 	if (*first_displayed_entry == te) {
3888 		if (!isroot)
3889 			*first_displayed_entry = NULL;
3890 		return;
3891 	}
3892 
3893 	/* XXX this is stupid... switch to TAILQ? */
3894 	for (i = 0; i < maxscroll; i++) {
3895 		while (te != *first_displayed_entry) {
3896 			prev = te;
3897 			te = SIMPLEQ_NEXT(te, entry);
3898 		}
3899 		*first_displayed_entry = prev;
3900 		te = SIMPLEQ_FIRST(&entries->head);
3901 	}
3902 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3903 		*first_displayed_entry = NULL;
3904 }
3905 
3906 static int
3907 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3908 	struct got_tree_entry *last_displayed_entry,
3909 	const struct got_tree_entries *entries)
3910 {
3911 	struct got_tree_entry *next, *last;
3912 	int n = 0;
3913 
3914 	if (*first_displayed_entry)
3915 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3916 	else
3917 		next = SIMPLEQ_FIRST(&entries->head);
3918 	last = last_displayed_entry;
3919 	while (next && last && n++ < maxscroll) {
3920 		last = SIMPLEQ_NEXT(last, entry);
3921 		if (last) {
3922 			*first_displayed_entry = next;
3923 			next = SIMPLEQ_NEXT(next, entry);
3924 		}
3925 	}
3926 	return n;
3927 }
3928 
3929 static const struct got_error *
3930 tree_entry_path(char **path, struct tog_parent_trees *parents,
3931     struct got_tree_entry *te)
3932 {
3933 	const struct got_error *err = NULL;
3934 	struct tog_parent_tree *pt;
3935 	size_t len = 2; /* for leading slash and NUL */
3936 
3937 	TAILQ_FOREACH(pt, parents, entry)
3938 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3939 	if (te)
3940 		len += strlen(te->name);
3941 
3942 	*path = calloc(1, len);
3943 	if (path == NULL)
3944 		return got_error_from_errno("calloc");
3945 
3946 	(*path)[0] = '/';
3947 	pt = TAILQ_LAST(parents, tog_parent_trees);
3948 	while (pt) {
3949 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3950 			err = got_error(GOT_ERR_NO_SPACE);
3951 			goto done;
3952 		}
3953 		if (strlcat(*path, "/", len) >= len) {
3954 			err = got_error(GOT_ERR_NO_SPACE);
3955 			goto done;
3956 		}
3957 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3958 	}
3959 	if (te) {
3960 		if (strlcat(*path, te->name, len) >= len) {
3961 			err = got_error(GOT_ERR_NO_SPACE);
3962 			goto done;
3963 		}
3964 	}
3965 done:
3966 	if (err) {
3967 		free(*path);
3968 		*path = NULL;
3969 	}
3970 	return err;
3971 }
3972 
3973 static const struct got_error *
3974 blame_tree_entry(struct tog_view **new_view, int begin_x,
3975     struct got_tree_entry *te, struct tog_parent_trees *parents,
3976     struct got_object_id *commit_id, struct got_reflist_head *refs,
3977     struct got_repository *repo)
3978 {
3979 	const struct got_error *err = NULL;
3980 	char *path;
3981 	struct tog_view *blame_view;
3982 
3983 	err = tree_entry_path(&path, parents, te);
3984 	if (err)
3985 		return err;
3986 
3987 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3988 	if (blame_view == NULL)
3989 		return got_error_from_errno("view_open");
3990 
3991 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3992 	if (err) {
3993 		view_close(blame_view);
3994 		free(path);
3995 	} else
3996 		*new_view = blame_view;
3997 	return err;
3998 }
3999 
4000 static const struct got_error *
4001 log_tree_entry(struct tog_view **new_view, int begin_x,
4002     struct got_tree_entry *te, struct tog_parent_trees *parents,
4003     struct got_object_id *commit_id, struct got_reflist_head *refs,
4004     struct got_repository *repo)
4005 {
4006 	struct tog_view *log_view;
4007 	const struct got_error *err = NULL;
4008 	char *path;
4009 
4010 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
4011 	if (log_view == NULL)
4012 		return got_error_from_errno("view_open");
4013 
4014 	err = tree_entry_path(&path, parents, te);
4015 	if (err)
4016 		return err;
4017 
4018 	err = open_log_view(log_view, commit_id, refs, repo, NULL, path, 0);
4019 	if (err)
4020 		view_close(log_view);
4021 	else
4022 		*new_view = log_view;
4023 	free(path);
4024 	return err;
4025 }
4026 
4027 static const struct got_error *
4028 open_tree_view(struct tog_view *view, struct got_tree_object *root,
4029     struct got_object_id *commit_id, struct got_reflist_head *refs,
4030     struct got_repository *repo)
4031 {
4032 	const struct got_error *err = NULL;
4033 	char *commit_id_str = NULL;
4034 	struct tog_tree_view_state *s = &view->state.tree;
4035 
4036 	TAILQ_INIT(&s->parents);
4037 
4038 	err = got_object_id_str(&commit_id_str, commit_id);
4039 	if (err != NULL)
4040 		goto done;
4041 
4042 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
4043 		err = got_error_from_errno("asprintf");
4044 		goto done;
4045 	}
4046 
4047 	s->root = s->tree = root;
4048 	s->entries = got_object_tree_get_entries(root);
4049 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
4050 	s->commit_id = got_object_id_dup(commit_id);
4051 	if (s->commit_id == NULL) {
4052 		err = got_error_from_errno("got_object_id_dup");
4053 		goto done;
4054 	}
4055 	s->refs = refs;
4056 	s->repo = repo;
4057 
4058 	view->show = show_tree_view;
4059 	view->input = input_tree_view;
4060 	view->close = close_tree_view;
4061 	view->search_start = search_start_tree_view;
4062 	view->search_next = search_next_tree_view;
4063 done:
4064 	free(commit_id_str);
4065 	if (err) {
4066 		free(s->tree_label);
4067 		s->tree_label = NULL;
4068 	}
4069 	return err;
4070 }
4071 
4072 static const struct got_error *
4073 close_tree_view(struct tog_view *view)
4074 {
4075 	struct tog_tree_view_state *s = &view->state.tree;
4076 
4077 	free(s->tree_label);
4078 	s->tree_label = NULL;
4079 	free(s->commit_id);
4080 	s->commit_id = NULL;
4081 	while (!TAILQ_EMPTY(&s->parents)) {
4082 		struct tog_parent_tree *parent;
4083 		parent = TAILQ_FIRST(&s->parents);
4084 		TAILQ_REMOVE(&s->parents, parent, entry);
4085 		free(parent);
4086 
4087 	}
4088 	if (s->tree != s->root)
4089 		got_object_tree_close(s->tree);
4090 	got_object_tree_close(s->root);
4091 
4092 	return NULL;
4093 }
4094 
4095 static const struct got_error *
4096 search_start_tree_view(struct tog_view *view)
4097 {
4098 	struct tog_tree_view_state *s = &view->state.tree;
4099 
4100 	s->matched_entry = NULL;
4101 	return NULL;
4102 }
4103 
4104 static int
4105 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
4106 {
4107 	regmatch_t regmatch;
4108 
4109 	return regexec(regex, te->name, 1, &regmatch, 0) == 0;
4110 }
4111 
4112 static const struct got_error *
4113 search_next_tree_view(struct tog_view *view)
4114 {
4115 	struct tog_tree_view_state *s = &view->state.tree;
4116 	struct got_tree_entry *entry, *te;
4117 
4118 	if (!view->searching) {
4119 		view->search_next_done = 1;
4120 		return NULL;
4121 	}
4122 
4123 	if (s->matched_entry) {
4124 		if (view->searching == TOG_SEARCH_FORWARD) {
4125 			if (s->selected_entry)
4126 				entry = SIMPLEQ_NEXT(s->selected_entry, entry);
4127 			else
4128 				entry = SIMPLEQ_FIRST(&s->entries->head);
4129 		}
4130 		else {
4131 			if (s->selected_entry == NULL) {
4132 				SIMPLEQ_FOREACH(te, &s->entries->head, entry)
4133 					entry = te;
4134 			} else {
4135 				SIMPLEQ_FOREACH(te, &s->entries->head, entry) {
4136 					entry = te;
4137 					if (SIMPLEQ_NEXT(te, entry) ==
4138 					    s->selected_entry)
4139 						break;
4140 				}
4141 			}
4142 		}
4143 	} else {
4144 		if (view->searching == TOG_SEARCH_FORWARD)
4145 			entry = SIMPLEQ_FIRST(&s->entries->head);
4146 		else {
4147 			SIMPLEQ_FOREACH(te, &s->entries->head, entry)
4148 				entry = te;
4149 		}
4150 	}
4151 
4152 	while (1) {
4153 		if (entry == NULL) {
4154 			if (s->matched_entry == NULL) {
4155 				view->search_next_done = 1;
4156 				return NULL;
4157 			}
4158 			if (view->searching == TOG_SEARCH_FORWARD)
4159 				entry = SIMPLEQ_FIRST(&s->entries->head);
4160 			else {
4161 				SIMPLEQ_FOREACH(te, &s->entries->head, entry)
4162 					entry = te;
4163 			}
4164 		}
4165 
4166 		if (match_tree_entry(entry, &view->regex)) {
4167 			view->search_next_done = 1;
4168 			s->matched_entry = entry;
4169 			break;
4170 		}
4171 
4172 		if (view->searching == TOG_SEARCH_FORWARD)
4173 			entry = SIMPLEQ_NEXT(entry, entry);
4174 		else {
4175 			if (SIMPLEQ_FIRST(&s->entries->head) == entry)
4176 				entry = NULL;
4177 			else {
4178 				SIMPLEQ_FOREACH(te, &s->entries->head, entry) {
4179 					if (SIMPLEQ_NEXT(te, entry) == entry) {
4180 						entry = te;
4181 						break;
4182 					}
4183 				}
4184 			}
4185 		}
4186 	}
4187 
4188 	if (s->matched_entry) {
4189 		s->first_displayed_entry = s->matched_entry;
4190 		s->selected = 0;
4191 	}
4192 
4193 	return NULL;
4194 }
4195 
4196 static const struct got_error *
4197 show_tree_view(struct tog_view *view)
4198 {
4199 	const struct got_error *err = NULL;
4200 	struct tog_tree_view_state *s = &view->state.tree;
4201 	char *parent_path;
4202 
4203 	err = tree_entry_path(&parent_path, &s->parents, NULL);
4204 	if (err)
4205 		return err;
4206 
4207 	err = draw_tree_entries(view, &s->first_displayed_entry,
4208 	    &s->last_displayed_entry, &s->selected_entry,
4209 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
4210 	    s->entries, s->selected, view->nlines, s->tree == s->root);
4211 	free(parent_path);
4212 
4213 	view_vborder(view);
4214 	return err;
4215 }
4216 
4217 static const struct got_error *
4218 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
4219     struct tog_view **focus_view, struct tog_view *view, int ch)
4220 {
4221 	const struct got_error *err = NULL;
4222 	struct tog_tree_view_state *s = &view->state.tree;
4223 	struct tog_view *log_view;
4224 	int begin_x = 0, nscrolled;
4225 
4226 	switch (ch) {
4227 	case 'i':
4228 		s->show_ids = !s->show_ids;
4229 		break;
4230 	case 'l':
4231 		if (!s->selected_entry)
4232 			break;
4233 		if (view_is_parent_view(view))
4234 			begin_x = view_split_begin_x(view->begin_x);
4235 		err = log_tree_entry(&log_view, begin_x,
4236 		    s->selected_entry, &s->parents,
4237 		    s->commit_id, s->refs, s->repo);
4238 		if (view_is_parent_view(view)) {
4239 			err = view_close_child(view);
4240 			if (err)
4241 				return err;
4242 			err = view_set_child(view, log_view);
4243 			if (err) {
4244 				view_close(log_view);
4245 				break;
4246 			}
4247 			*focus_view = log_view;
4248 			view->child_focussed = 1;
4249 		} else
4250 			*new_view = log_view;
4251 		break;
4252 	case 'k':
4253 	case KEY_UP:
4254 		if (s->selected > 0) {
4255 			s->selected--;
4256 			if (s->selected == 0)
4257 				break;
4258 		}
4259 		if (s->selected > 0)
4260 			break;
4261 		tree_scroll_up(view, &s->first_displayed_entry, 1,
4262 		    s->entries, s->tree == s->root);
4263 		break;
4264 	case KEY_PPAGE:
4265 		tree_scroll_up(view, &s->first_displayed_entry,
4266 		    MAX(0, view->nlines - 4 - s->selected), s->entries,
4267 		    s->tree == s->root);
4268 		s->selected = 0;
4269 		if (SIMPLEQ_FIRST(&s->entries->head) ==
4270 		    s->first_displayed_entry && s->tree != s->root)
4271 			s->first_displayed_entry = NULL;
4272 		break;
4273 	case 'j':
4274 	case KEY_DOWN:
4275 		if (s->selected < s->ndisplayed - 1) {
4276 			s->selected++;
4277 			break;
4278 		}
4279 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry) == NULL)
4280 			/* can't scroll any further */
4281 			break;
4282 		tree_scroll_down(&s->first_displayed_entry, 1,
4283 		    s->last_displayed_entry, s->entries);
4284 		break;
4285 	case KEY_NPAGE:
4286 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
4287 		    == NULL) {
4288 			/* can't scroll any further; move cursor down */
4289 			if (s->selected < s->ndisplayed - 1)
4290 				s->selected = s->ndisplayed - 1;
4291 			break;
4292 		}
4293 		nscrolled = tree_scroll_down(&s->first_displayed_entry,
4294 		    view->nlines, s->last_displayed_entry, s->entries);
4295 		if (nscrolled < view->nlines) {
4296 			int ndisplayed = 0;
4297 			struct got_tree_entry *te;
4298 			te = s->first_displayed_entry;
4299 			do {
4300 				ndisplayed++;
4301 				te = SIMPLEQ_NEXT(te, entry);
4302 			} while (te);
4303 			s->selected = ndisplayed - 1;
4304 		}
4305 		break;
4306 	case KEY_ENTER:
4307 	case '\r':
4308 	case KEY_BACKSPACE:
4309 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
4310 			struct tog_parent_tree *parent;
4311 			/* user selected '..' */
4312 			if (s->tree == s->root)
4313 				break;
4314 			parent = TAILQ_FIRST(&s->parents);
4315 			TAILQ_REMOVE(&s->parents, parent,
4316 			    entry);
4317 			got_object_tree_close(s->tree);
4318 			s->tree = parent->tree;
4319 			s->entries =
4320 			    got_object_tree_get_entries(s->tree);
4321 			s->first_displayed_entry =
4322 			    parent->first_displayed_entry;
4323 			s->selected_entry =
4324 			    parent->selected_entry;
4325 			s->selected = parent->selected;
4326 			free(parent);
4327 		} else if (S_ISDIR(s->selected_entry->mode)) {
4328 			struct got_tree_object *subtree;
4329 			err = got_object_open_as_tree(&subtree,
4330 			    s->repo, s->selected_entry->id);
4331 			if (err)
4332 				break;
4333 			err = tree_view_visit_subtree(subtree, s);
4334 			if (err) {
4335 				got_object_tree_close(subtree);
4336 				break;
4337 			}
4338 		} else if (S_ISREG(s->selected_entry->mode)) {
4339 			struct tog_view *blame_view;
4340 			int begin_x = view_is_parent_view(view) ?
4341 			    view_split_begin_x(view->begin_x) : 0;
4342 
4343 			err = blame_tree_entry(&blame_view, begin_x,
4344 			    s->selected_entry, &s->parents,
4345 			    s->commit_id, s->refs, s->repo);
4346 			if (err)
4347 				break;
4348 			if (view_is_parent_view(view)) {
4349 				err = view_close_child(view);
4350 				if (err)
4351 					return err;
4352 				err = view_set_child(view, blame_view);
4353 				if (err) {
4354 					view_close(blame_view);
4355 					break;
4356 				}
4357 				*focus_view = blame_view;
4358 				view->child_focussed = 1;
4359 			} else
4360 				*new_view = blame_view;
4361 		}
4362 		break;
4363 	case KEY_RESIZE:
4364 		if (s->selected > view->nlines)
4365 			s->selected = s->ndisplayed - 1;
4366 		break;
4367 	default:
4368 		break;
4369 	}
4370 
4371 	return err;
4372 }
4373 
4374 __dead static void
4375 usage_tree(void)
4376 {
4377 	endwin();
4378 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
4379 	    getprogname());
4380 	exit(1);
4381 }
4382 
4383 static const struct got_error *
4384 cmd_tree(int argc, char *argv[])
4385 {
4386 	const struct got_error *error;
4387 	struct got_repository *repo = NULL;
4388 	struct got_reflist_head refs;
4389 	char *repo_path = NULL;
4390 	struct got_object_id *commit_id = NULL;
4391 	char *commit_id_arg = NULL;
4392 	struct got_commit_object *commit = NULL;
4393 	struct got_tree_object *tree = NULL;
4394 	int ch;
4395 	struct tog_view *view;
4396 
4397 	SIMPLEQ_INIT(&refs);
4398 
4399 #ifndef PROFILE
4400 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
4401 	    NULL) == -1)
4402 		err(1, "pledge");
4403 #endif
4404 
4405 	while ((ch = getopt(argc, argv, "c:")) != -1) {
4406 		switch (ch) {
4407 		case 'c':
4408 			commit_id_arg = optarg;
4409 			break;
4410 		default:
4411 			usage_tree();
4412 			/* NOTREACHED */
4413 		}
4414 	}
4415 
4416 	argc -= optind;
4417 	argv += optind;
4418 
4419 	if (argc == 0) {
4420 		struct got_worktree *worktree;
4421 		char *cwd = getcwd(NULL, 0);
4422 		if (cwd == NULL)
4423 			return got_error_from_errno("getcwd");
4424 		error = got_worktree_open(&worktree, cwd);
4425 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4426 			goto done;
4427 		if (worktree) {
4428 			free(cwd);
4429 			repo_path =
4430 			    strdup(got_worktree_get_repo_path(worktree));
4431 			got_worktree_close(worktree);
4432 		} else
4433 			repo_path = cwd;
4434 		if (repo_path == NULL) {
4435 			error = got_error_from_errno("strdup");
4436 			goto done;
4437 		}
4438 	} else if (argc == 1) {
4439 		repo_path = realpath(argv[0], NULL);
4440 		if (repo_path == NULL)
4441 			return got_error_from_errno2("realpath", argv[0]);
4442 	} else
4443 		usage_log();
4444 
4445 	init_curses();
4446 
4447 	error = got_repo_open(&repo, repo_path);
4448 	if (error != NULL)
4449 		goto done;
4450 
4451 	error = apply_unveil(got_repo_get_path(repo), NULL);
4452 	if (error)
4453 		goto done;
4454 
4455 	if (commit_id_arg == NULL)
4456 		error = get_head_commit_id(&commit_id, GOT_REF_HEAD, repo);
4457 	else {
4458 		error = get_head_commit_id(&commit_id, commit_id_arg, repo);
4459 		if (error) {
4460 			if (error->code != GOT_ERR_NOT_REF)
4461 				goto done;
4462 			error = got_repo_match_object_id_prefix(&commit_id,
4463 			    commit_id_arg, GOT_OBJ_TYPE_COMMIT, repo);
4464 		}
4465 	}
4466 	if (error != NULL)
4467 		goto done;
4468 
4469 	error = got_object_open_as_commit(&commit, repo, commit_id);
4470 	if (error != NULL)
4471 		goto done;
4472 
4473 	error = got_object_open_as_tree(&tree, repo,
4474 	    got_object_commit_get_tree_id(commit));
4475 	if (error != NULL)
4476 		goto done;
4477 
4478 	error = got_ref_list(&refs, repo);
4479 	if (error)
4480 		goto done;
4481 
4482 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
4483 	if (view == NULL) {
4484 		error = got_error_from_errno("view_open");
4485 		goto done;
4486 	}
4487 	error = open_tree_view(view, tree, commit_id, &refs, repo);
4488 	if (error)
4489 		goto done;
4490 	error = view_loop(view);
4491 done:
4492 	free(repo_path);
4493 	free(commit_id);
4494 	if (commit)
4495 		got_object_commit_close(commit);
4496 	if (tree)
4497 		got_object_tree_close(tree);
4498 	if (repo)
4499 		got_repo_close(repo);
4500 	got_ref_list_free(&refs);
4501 	return error;
4502 }
4503 
4504 static void
4505 list_commands(void)
4506 {
4507 	int i;
4508 
4509 	fprintf(stderr, "commands:");
4510 	for (i = 0; i < nitems(tog_commands); i++) {
4511 		struct tog_cmd *cmd = &tog_commands[i];
4512 		fprintf(stderr, " %s", cmd->name);
4513 	}
4514 	fputc('\n', stderr);
4515 }
4516 
4517 __dead static void
4518 usage(int hflag)
4519 {
4520 	fprintf(stderr, "usage: %s [-h] [-V] [command] [arg ...]\n",
4521 	    getprogname());
4522 	if (hflag)
4523 		list_commands();
4524 	exit(1);
4525 }
4526 
4527 static char **
4528 make_argv(const char *arg0, const char *arg1)
4529 {
4530 	char **argv;
4531 	int argc = (arg1 == NULL ? 1 : 2);
4532 
4533 	argv = calloc(argc, sizeof(char *));
4534 	if (argv == NULL)
4535 		err(1, "calloc");
4536 	argv[0] = strdup(arg0);
4537 	if (argv[0] == NULL)
4538 		err(1, "calloc");
4539 	if (arg1) {
4540 		argv[1] = strdup(arg1);
4541 		if (argv[1] == NULL)
4542 			err(1, "calloc");
4543 	}
4544 
4545 	return argv;
4546 }
4547 
4548 int
4549 main(int argc, char *argv[])
4550 {
4551 	const struct got_error *error = NULL;
4552 	struct tog_cmd *cmd = NULL;
4553 	int ch, hflag = 0, Vflag = 0;
4554 	char **cmd_argv = NULL;
4555 
4556 	setlocale(LC_CTYPE, "");
4557 
4558 	while ((ch = getopt(argc, argv, "hV")) != -1) {
4559 		switch (ch) {
4560 		case 'h':
4561 			hflag = 1;
4562 			break;
4563 		case 'V':
4564 			Vflag = 1;
4565 			break;
4566 		default:
4567 			usage(hflag);
4568 			/* NOTREACHED */
4569 		}
4570 	}
4571 
4572 	argc -= optind;
4573 	argv += optind;
4574 	optind = 0;
4575 	optreset = 1;
4576 
4577 	if (Vflag) {
4578 		got_version_print_str();
4579 		return 1;
4580 	}
4581 
4582 	if (argc == 0) {
4583 		if (hflag)
4584 			usage(hflag);
4585 		/* Build an argument vector which runs a default command. */
4586 		cmd = &tog_commands[0];
4587 		cmd_argv = make_argv(cmd->name, NULL);
4588 		argc = 1;
4589 	} else {
4590 		int i;
4591 
4592 		/* Did the user specific a command? */
4593 		for (i = 0; i < nitems(tog_commands); i++) {
4594 			if (strncmp(tog_commands[i].name, argv[0],
4595 			    strlen(argv[0])) == 0) {
4596 				cmd = &tog_commands[i];
4597 				break;
4598 			}
4599 		}
4600 
4601 		if (cmd == NULL) {
4602 			fprintf(stderr, "%s: unknown command '%s'\n",
4603 			    getprogname(), argv[0]);
4604 			list_commands();
4605 			return 1;
4606 		}
4607 	}
4608 
4609 	if (hflag)
4610 		cmd->cmd_usage();
4611 	else
4612 		error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4613 
4614 	endwin();
4615 	free(cmd_argv);
4616 	if (error)
4617 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4618 	return 0;
4619 }