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