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 
40 #include "got_error.h"
41 #include "got_object.h"
42 #include "got_reference.h"
43 #include "got_repository.h"
44 #include "got_diff.h"
45 #include "got_opentemp.h"
46 #include "got_commit_graph.h"
47 #include "got_utf8.h"
48 #include "got_blame.h"
49 #include "got_privsep.h"
50 #include "got_worktree.h"
51 
52 #ifndef MIN
53 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
54 #endif
55 
56 #ifndef MAX
57 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
58 #endif
59 
60 
61 #ifndef nitems
62 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
63 #endif
64 
65 struct tog_cmd {
66 	const char *name;
67 	const struct got_error *(*cmd_main)(int, char *[]);
68 	void (*cmd_usage)(void);
69 	const char *descr;
70 };
71 
72 __dead static void	usage(void);
73 __dead static void	usage_log(void);
74 __dead static void	usage_diff(void);
75 __dead static void	usage_blame(void);
76 __dead static void	usage_tree(void);
77 
78 static const struct got_error*	cmd_log(int, char *[]);
79 static const struct got_error*	cmd_diff(int, char *[]);
80 static const struct got_error*	cmd_blame(int, char *[]);
81 static const struct got_error*	cmd_tree(int, char *[]);
82 
83 static struct tog_cmd tog_commands[] = {
84 	{ "log",	cmd_log,	usage_log,
85 	    "show repository history" },
86 	{ "diff",	cmd_diff,	usage_diff,
87 	    "compare files and directories" },
88 	{ "blame",	cmd_blame,	usage_blame,
89 	    "show line-by-line file history" },
90 	{ "tree",	cmd_tree,	usage_tree,
91 	    "browse trees in repository" },
92 };
93 
94 enum tog_view_type {
95 	TOG_VIEW_DIFF,
96 	TOG_VIEW_LOG,
97 	TOG_VIEW_BLAME,
98 	TOG_VIEW_TREE
99 };
100 
101 struct tog_diff_view_state {
102 	struct got_object_id *id1, *id2;
103 	FILE *f;
104 	int first_displayed_line;
105 	int last_displayed_line;
106 	int eof;
107 	int diff_context;
108 	struct got_repository *repo;
109 };
110 
111 struct commit_queue_entry {
112 	TAILQ_ENTRY(commit_queue_entry) entry;
113 	struct got_object_id *id;
114 	struct got_commit_object *commit;
115 	int idx;
116 };
117 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
118 struct commit_queue {
119 	int ncommits;
120 	struct commit_queue_head head;
121 };
122 
123 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
124 
125 struct tog_log_thread_args {
126 	pthread_cond_t need_commits;
127 	int commits_needed;
128 	struct got_commit_graph *graph;
129 	struct commit_queue *commits;
130 	const char *in_repo_path;
131 	struct got_object_id *start_id;
132 	struct got_repository *repo;
133 	int log_complete;
134 	sig_atomic_t *quit;
135 	struct tog_view *view;
136 	struct commit_queue_entry **first_displayed_entry;
137 	struct commit_queue_entry **selected_entry;
138 };
139 
140 struct tog_log_view_state {
141 	struct commit_queue commits;
142 	struct commit_queue_entry *first_displayed_entry;
143 	struct commit_queue_entry *last_displayed_entry;
144 	struct commit_queue_entry *selected_entry;
145 	int selected;
146 	char *in_repo_path;
147 	struct got_repository *repo;
148 	struct got_object_id *start_id;
149 	sig_atomic_t quit;
150 	pthread_t thread;
151 	struct tog_log_thread_args thread_args;
152 };
153 
154 struct tog_blame_cb_args {
155 	struct tog_blame_line *lines; /* one per line */
156 	int nlines;
157 
158 	struct tog_view *view;
159 	struct got_object_id *commit_id;
160 	int *quit;
161 };
162 
163 struct tog_blame_thread_args {
164 	const char *path;
165 	struct got_repository *repo;
166 	struct tog_blame_cb_args *cb_args;
167 	int *complete;
168 };
169 
170 struct tog_blame {
171 	FILE *f;
172 	size_t filesize;
173 	struct tog_blame_line *lines;
174 	int nlines;
175 	pthread_t thread;
176 	struct tog_blame_thread_args thread_args;
177 	struct tog_blame_cb_args cb_args;
178 	const char *path;
179 };
180 
181 struct tog_blame_view_state {
182 	int first_displayed_line;
183 	int last_displayed_line;
184 	int selected_line;
185 	int blame_complete;
186 	int eof;
187 	int done;
188 	struct got_object_id_queue blamed_commits;
189 	struct got_object_qid *blamed_commit;
190 	char *path;
191 	struct got_repository *repo;
192 	struct got_object_id *commit_id;
193 	struct tog_blame blame;
194 };
195 
196 struct tog_parent_tree {
197 	TAILQ_ENTRY(tog_parent_tree) entry;
198 	struct got_tree_object *tree;
199 	struct got_tree_entry *first_displayed_entry;
200 	struct got_tree_entry *selected_entry;
201 	int selected;
202 };
203 
204 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
205 
206 struct tog_tree_view_state {
207 	char *tree_label;
208 	struct got_tree_object *root;
209 	struct got_tree_object *tree;
210 	const struct got_tree_entries *entries;
211 	struct got_tree_entry *first_displayed_entry;
212 	struct got_tree_entry *last_displayed_entry;
213 	struct got_tree_entry *selected_entry;
214 	int ndisplayed, selected, show_ids;
215 	struct tog_parent_trees parents;
216 	struct got_object_id *commit_id;
217 	struct got_repository *repo;
218 };
219 
220 /*
221  * We implement two types of views: parent views and child views.
222  *
223  * The 'Tab' key switches between a parent view and its child view.
224  * Child views are shown side-by-side to their parent view, provided
225  * there is enough screen estate.
226  *
227  * When a new view is opened from within a parent view, this new view
228  * becomes a child view of the parent view, replacing any existing child.
229  *
230  * When a new view is opened from within a child view, this new view
231  * becomes a parent view which will obscure the views below until the
232  * user quits the new parent view by typing 'q'.
233  *
234  * This list of views contains parent views only.
235  * Child views are only pointed to by their parent view.
236  */
237 TAILQ_HEAD(tog_view_list_head, tog_view);
238 
239 struct tog_view {
240 	TAILQ_ENTRY(tog_view) entry;
241 	WINDOW *window;
242 	PANEL *panel;
243 	int nlines, ncols, begin_y, begin_x;
244 	int lines, cols; /* copies of LINES and COLS */
245 	int focussed;
246 	struct tog_view *parent;
247 	struct tog_view *child;
248 	int child_focussed;
249 
250 	/* type-specific state */
251 	enum tog_view_type type;
252 	union {
253 		struct tog_diff_view_state diff;
254 		struct tog_log_view_state log;
255 		struct tog_blame_view_state blame;
256 		struct tog_tree_view_state tree;
257 	} state;
258 
259 	const struct got_error *(*show)(struct tog_view *);
260 	const struct got_error *(*input)(struct tog_view **,
261 	    struct tog_view **, struct tog_view**, struct tog_view *, int);
262 	const struct got_error *(*close)(struct tog_view *);
263 };
264 
265 static const struct got_error *open_diff_view(struct tog_view *,
266     struct got_object_id *, struct got_object_id *, struct got_repository *);
267 static const struct got_error *show_diff_view(struct tog_view *);
268 static const struct got_error *input_diff_view(struct tog_view **,
269     struct tog_view **, struct tog_view **, struct tog_view *, int);
270 static const struct got_error* close_diff_view(struct tog_view *);
271 
272 static const struct got_error *open_log_view(struct tog_view *,
273     struct got_object_id *, struct got_repository *, const char *, int);
274 static const struct got_error * show_log_view(struct tog_view *);
275 static const struct got_error *input_log_view(struct tog_view **,
276     struct tog_view **, struct tog_view **, struct tog_view *, int);
277 static const struct got_error *close_log_view(struct tog_view *);
278 
279 static const struct got_error *open_blame_view(struct tog_view *, char *,
280     struct got_object_id *, struct got_repository *);
281 static const struct got_error *show_blame_view(struct tog_view *);
282 static const struct got_error *input_blame_view(struct tog_view **,
283     struct tog_view **, struct tog_view **, struct tog_view *, int);
284 static const struct got_error *close_blame_view(struct tog_view *);
285 
286 static const struct got_error *open_tree_view(struct tog_view *,
287     struct got_tree_object *, struct got_object_id *, struct got_repository *);
288 static const struct got_error *show_tree_view(struct tog_view *);
289 static const struct got_error *input_tree_view(struct tog_view **,
290     struct tog_view **, struct tog_view **, struct tog_view *, int);
291 static const struct got_error *close_tree_view(struct tog_view *);
292 
293 static volatile sig_atomic_t tog_sigwinch_received;
294 
295 static void
296 tog_sigwinch(int signo)
297 {
298 	tog_sigwinch_received = 1;
299 }
300 
301 static const struct got_error *
302 view_close(struct tog_view *view)
303 {
304 	const struct got_error *err = NULL;
305 
306 	if (view->child) {
307 		view_close(view->child);
308 		view->child = NULL;
309 	}
310 	if (view->close)
311 		err = view->close(view);
312 	if (view->panel)
313 		del_panel(view->panel);
314 	if (view->window)
315 		delwin(view->window);
316 	free(view);
317 	return err;
318 }
319 
320 static struct tog_view *
321 view_open(int nlines, int ncols, int begin_y, int begin_x,
322     enum tog_view_type type)
323 {
324 	struct tog_view *view = calloc(1, sizeof(*view));
325 
326 	if (view == NULL)
327 		return NULL;
328 
329 	view->type = type;
330 	view->lines = LINES;
331 	view->cols = COLS;
332 	view->nlines = nlines ? nlines : LINES - begin_y;
333 	view->ncols = ncols ? ncols : COLS - begin_x;
334 	view->begin_y = begin_y;
335 	view->begin_x = begin_x;
336 	view->window = newwin(nlines, ncols, begin_y, begin_x);
337 	if (view->window == NULL) {
338 		view_close(view);
339 		return NULL;
340 	}
341 	view->panel = new_panel(view->window);
342 	if (view->panel == NULL ||
343 	    set_panel_userptr(view->panel, view) != OK) {
344 		view_close(view);
345 		return NULL;
346 	}
347 
348 	keypad(view->window, TRUE);
349 	return view;
350 }
351 
352 static int
353 view_split_begin_x(int begin_x)
354 {
355 	if (begin_x > 0 || COLS < 120)
356 		return 0;
357 	return (COLS - MAX(COLS / 2, 80));
358 }
359 
360 static const struct got_error *view_resize(struct tog_view *);
361 
362 static const struct got_error *
363 view_splitscreen(struct tog_view *view)
364 {
365 	const struct got_error *err = NULL;
366 
367 	view->begin_y = 0;
368 	view->begin_x = view_split_begin_x(0);
369 	view->nlines = LINES;
370 	view->ncols = COLS - view->begin_x;
371 	view->lines = LINES;
372 	view->cols = COLS;
373 	err = view_resize(view);
374 	if (err)
375 		return err;
376 
377 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
378 		return got_error_from_errno();
379 
380 	return NULL;
381 }
382 
383 static const struct got_error *
384 view_fullscreen(struct tog_view *view)
385 {
386 	const struct got_error *err = NULL;
387 
388 	view->begin_x = 0;
389 	view->begin_y = 0;
390 	view->nlines = LINES;
391 	view->ncols = COLS;
392 	view->lines = LINES;
393 	view->cols = COLS;
394 	err = view_resize(view);
395 	if (err)
396 		return err;
397 
398 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
399 		return got_error_from_errno();
400 
401 	return NULL;
402 }
403 
404 static int
405 view_is_parent_view(struct tog_view *view)
406 {
407 	return view->parent == NULL;
408 }
409 
410 static const struct got_error *
411 view_resize(struct tog_view *view)
412 {
413 	int nlines, ncols;
414 
415 	if (view->lines > LINES)
416 		nlines = view->nlines - (view->lines - LINES);
417 	else
418 		nlines = view->nlines + (LINES - view->lines);
419 
420 	if (view->cols > COLS)
421 		ncols = view->ncols - (view->cols - COLS);
422 	else
423 		ncols = view->ncols + (COLS - view->cols);
424 
425 	if (wresize(view->window, nlines, ncols) == ERR)
426 		return got_error_from_errno();
427 	if (replace_panel(view->panel, view->window) == ERR)
428 		return got_error_from_errno();
429 	wclear(view->window);
430 
431 	view->nlines = nlines;
432 	view->ncols = ncols;
433 	view->lines = LINES;
434 	view->cols = COLS;
435 
436 	if (view->child) {
437 		view->child->begin_x = view_split_begin_x(view->begin_x);
438 		if (view->child->begin_x == 0) {
439 			view_fullscreen(view->child);
440 			if (view->child->focussed)
441 				show_panel(view->child->panel);
442 			else
443 				show_panel(view->panel);
444 		} else {
445 			view_splitscreen(view->child);
446 			show_panel(view->child->panel);
447 		}
448 	}
449 
450 	return NULL;
451 }
452 
453 static const struct got_error *
454 view_close_child(struct tog_view *view)
455 {
456 	const struct got_error *err = NULL;
457 
458 	if (view->child == NULL)
459 		return NULL;
460 
461 	err = view_close(view->child);
462 	view->child = NULL;
463 	return err;
464 }
465 
466 static const struct got_error *
467 view_set_child(struct tog_view *view, struct tog_view *child)
468 {
469 	const struct got_error *err = NULL;
470 
471 	view->child = child;
472 	child->parent = view;
473 	return err;
474 }
475 
476 static int
477 view_is_splitscreen(struct tog_view *view)
478 {
479 	return !view_is_parent_view(view) && view->begin_x > 0;
480 }
481 
482 static void
483 tog_resizeterm(void)
484 {
485 	int cols, lines;
486 	struct winsize size;
487 
488 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
489 		cols = 80;     /* Default */
490 		lines = 24;
491 	} else {
492 		cols = size.ws_col;
493 		lines = size.ws_row;
494 	}
495 	resize_term(lines, cols);
496 }
497 
498 static const struct got_error *
499 view_input(struct tog_view **new, struct tog_view **dead,
500     struct tog_view **focus, int *done, struct tog_view *view,
501     struct tog_view_list_head *views)
502 {
503 	const struct got_error *err = NULL;
504 	struct tog_view *v;
505 	int ch, errcode;
506 
507 	*new = NULL;
508 	*dead = NULL;
509 	*focus = NULL;
510 
511 	nodelay(stdscr, FALSE);
512 	/* Allow threads to make progress while we are waiting for input. */
513 	errcode = pthread_mutex_unlock(&tog_mutex);
514 	if (errcode)
515 		return got_error_set_errno(errcode);
516 	ch = wgetch(view->window);
517 	errcode = pthread_mutex_lock(&tog_mutex);
518 	if (errcode)
519 		return got_error_set_errno(errcode);
520 	nodelay(stdscr, TRUE);
521 
522 	if (tog_sigwinch_received) {
523 		tog_resizeterm();
524 		tog_sigwinch_received = 0;
525 		TAILQ_FOREACH(v, views, entry) {
526 			err = view_resize(v);
527 			if (err)
528 				return err;
529 			err = v->input(new, dead, focus, v, KEY_RESIZE);
530 			if (err)
531 				return err;
532 		}
533 	}
534 
535 	switch (ch) {
536 		case ERR:
537 			break;
538 		case '\t':
539 			if (view->child) {
540 				*focus = view->child;
541 				view->child_focussed = 1;
542 			} else if (view->parent) {
543 				*focus = view->parent;
544 				view->parent->child_focussed = 0;
545 			}
546 			break;
547 		case 'q':
548 			err = view->input(new, dead, focus, view, ch);
549 			*dead = view;
550 			break;
551 		case 'Q':
552 			*done = 1;
553 			break;
554 		case 'f':
555 			if (view_is_parent_view(view)) {
556 				if (view->child == NULL)
557 					break;
558 				if (view_is_splitscreen(view->child)) {
559 					*focus = view->child;
560 					view->child_focussed = 1;
561 					err = view_fullscreen(view->child);
562 				} else
563 					err = view_splitscreen(view->child);
564 				if (err)
565 					break;
566 				err = view->child->input(new, dead, focus,
567 				    view->child, KEY_RESIZE);
568 			} else {
569 				if (view_is_splitscreen(view)) {
570 					*focus = view;
571 					view->parent->child_focussed = 1;
572 					err = view_fullscreen(view);
573 				} else {
574 					err = view_splitscreen(view);
575 				}
576 				if (err)
577 					break;
578 				err = view->input(new, dead, focus, view,
579 				    KEY_RESIZE);
580 			}
581 			break;
582 		case KEY_RESIZE:
583 			break;
584 		default:
585 			err = view->input(new, dead, focus, view, ch);
586 			break;
587 	}
588 
589 	return err;
590 }
591 
592 void
593 view_vborder(struct tog_view *view)
594 {
595 	PANEL *panel;
596 	struct tog_view *view_above;
597 
598 	if (view->parent)
599 		return view_vborder(view->parent);
600 
601 	panel = panel_above(view->panel);
602 	if (panel == NULL)
603 		return;
604 
605 	view_above = panel_userptr(panel);
606 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
607 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
608 }
609 
610 int
611 view_needs_focus_indication(struct tog_view *view)
612 {
613 	if (view_is_parent_view(view)) {
614 		if (view->child == NULL || view->child_focussed)
615 			return 0;
616 		if (!view_is_splitscreen(view->child))
617 			return 0;
618 	} else if (!view_is_splitscreen(view))
619 		return 0;
620 
621 	return view->focussed;
622 }
623 
624 static const struct got_error *
625 view_loop(struct tog_view *view)
626 {
627 	const struct got_error *err = NULL;
628 	struct tog_view_list_head views;
629 	struct tog_view *new_view, *dead_view, *focus_view, *main_view;
630 	int fast_refresh = 10;
631 	int done = 0, errcode;
632 
633 	errcode = pthread_mutex_lock(&tog_mutex);
634 	if (errcode)
635 		return got_error_set_errno(errcode);
636 
637 	TAILQ_INIT(&views);
638 	TAILQ_INSERT_HEAD(&views, view, entry);
639 
640 	main_view = view;
641 	view->focussed = 1;
642 	err = view->show(view);
643 	if (err)
644 		return err;
645 	update_panels();
646 	doupdate();
647 	while (!TAILQ_EMPTY(&views) && !done) {
648 		/* Refresh fast during initialization, then become slower. */
649 		if (fast_refresh && fast_refresh-- == 0)
650 			halfdelay(10); /* switch to once per second */
651 
652 		err = view_input(&new_view, &dead_view, &focus_view, &done,
653 		    view, &views);
654 		if (err)
655 			break;
656 		if (dead_view) {
657 			struct tog_view *prev = NULL;
658 
659 			if (view_is_parent_view(dead_view))
660 				prev = TAILQ_PREV(dead_view,
661 				    tog_view_list_head, entry);
662 			else if (view->parent != dead_view)
663 				prev = view->parent;
664 
665 			if (dead_view->parent)
666 				dead_view->parent->child = NULL;
667 			else
668 				TAILQ_REMOVE(&views, dead_view, entry);
669 
670 			err = view_close(dead_view);
671 			if (err || dead_view == main_view)
672 				goto done;
673 
674 			if (view == dead_view) {
675 				if (focus_view)
676 					view = focus_view;
677 				else if (prev)
678 					view = prev;
679 				else if (!TAILQ_EMPTY(&views))
680 					view = TAILQ_LAST(&views,
681 					    tog_view_list_head);
682 				else
683 					view = NULL;
684 				if (view) {
685 					if (view->child && view->child_focussed)
686 						focus_view = view->child;
687 					else
688 						focus_view = view;
689 				}
690 			}
691 		}
692 		if (new_view) {
693 			struct tog_view *v, *t;
694 			/* Only allow one parent view per type. */
695 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
696 				if (v->type != new_view->type)
697 					continue;
698 				TAILQ_REMOVE(&views, v, entry);
699 				err = view_close(v);
700 				if (err)
701 					goto done;
702 				break;
703 			}
704 			TAILQ_INSERT_TAIL(&views, new_view, entry);
705 			view = new_view;
706 			if (focus_view == NULL)
707 				focus_view = new_view;
708 		}
709 		if (focus_view) {
710 			show_panel(focus_view->panel);
711 			if (view)
712 				view->focussed = 0;
713 			focus_view->focussed = 1;
714 			view = focus_view;
715 			if (new_view)
716 				show_panel(new_view->panel);
717 			if (view->child && view_is_splitscreen(view->child))
718 				show_panel(view->child->panel);
719 		}
720 		if (view) {
721 			if (focus_view == NULL) {
722 				view->focussed = 1;
723 				show_panel(view->panel);
724 				if (view->child && view_is_splitscreen(view->child))
725 					show_panel(view->child->panel);
726 				focus_view = view;
727 			}
728 			if (view->parent) {
729 				err = view->parent->show(view->parent);
730 				if (err)
731 					goto done;
732 			}
733 			err = view->show(view);
734 			if (err)
735 				goto done;
736 			if (view->child) {
737 				err = view->child->show(view->child);
738 				if (err)
739 					goto done;
740 			}
741 			update_panels();
742 			doupdate();
743 		}
744 	}
745 done:
746 	while (!TAILQ_EMPTY(&views)) {
747 		view = TAILQ_FIRST(&views);
748 		TAILQ_REMOVE(&views, view, entry);
749 		view_close(view);
750 	}
751 
752 	errcode = pthread_mutex_unlock(&tog_mutex);
753 	if (errcode)
754 		return got_error_set_errno(errcode);
755 
756 	return err;
757 }
758 
759 __dead static void
760 usage_log(void)
761 {
762 	endwin();
763 	fprintf(stderr,
764 	    "usage: %s log [-c commit] [-r repository-path] [path]\n",
765 	    getprogname());
766 	exit(1);
767 }
768 
769 /* Create newly allocated wide-character string equivalent to a byte string. */
770 static const struct got_error *
771 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
772 {
773 	char *vis = NULL;
774 	const struct got_error *err = NULL;
775 
776 	*ws = NULL;
777 	*wlen = mbstowcs(NULL, s, 0);
778 	if (*wlen == (size_t)-1) {
779 		int vislen;
780 		if (errno != EILSEQ)
781 			return got_error_from_errno();
782 
783 		/* byte string invalid in current encoding; try to "fix" it */
784 		err = got_mbsavis(&vis, &vislen, s);
785 		if (err)
786 			return err;
787 		*wlen = mbstowcs(NULL, vis, 0);
788 		if (*wlen == (size_t)-1) {
789 			err = got_error_from_errno(); /* give up */
790 			goto done;
791 		}
792 	}
793 
794 	*ws = calloc(*wlen + 1, sizeof(*ws));
795 	if (*ws == NULL) {
796 		err = got_error_from_errno();
797 		goto done;
798 	}
799 
800 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
801 		err = got_error_from_errno();
802 done:
803 	free(vis);
804 	if (err) {
805 		free(*ws);
806 		*ws = NULL;
807 		*wlen = 0;
808 	}
809 	return err;
810 }
811 
812 /* Format a line for display, ensuring that it won't overflow a width limit. */
813 static const struct got_error *
814 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
815 {
816 	const struct got_error *err = NULL;
817 	int cols = 0;
818 	wchar_t *wline = NULL;
819 	size_t wlen;
820 	int i;
821 
822 	*wlinep = NULL;
823 	*widthp = 0;
824 
825 	err = mbs2ws(&wline, &wlen, line);
826 	if (err)
827 		return err;
828 
829 	i = 0;
830 	while (i < wlen && cols < wlimit) {
831 		int width = wcwidth(wline[i]);
832 		switch (width) {
833 		case 0:
834 			i++;
835 			break;
836 		case 1:
837 		case 2:
838 			if (cols + width <= wlimit)
839 				cols += width;
840 			i++;
841 			break;
842 		case -1:
843 			if (wline[i] == L'\t')
844 				cols += TABSIZE - ((cols + 1) % TABSIZE);
845 			i++;
846 			break;
847 		default:
848 			err = got_error_from_errno();
849 			goto done;
850 		}
851 	}
852 	wline[i] = L'\0';
853 	if (widthp)
854 		*widthp = cols;
855 done:
856 	if (err)
857 		free(wline);
858 	else
859 		*wlinep = wline;
860 	return err;
861 }
862 
863 static const struct got_error *
864 draw_commit(struct tog_view *view, struct got_commit_object *commit,
865     struct got_object_id *id)
866 {
867 	const struct got_error *err = NULL;
868 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
869 	char *logmsg0 = NULL, *logmsg = NULL;
870 	char *author0 = NULL, *author = NULL;
871 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
872 	int author_width, logmsg_width;
873 	char *newline, *smallerthan;
874 	char *line = NULL;
875 	int col, limit;
876 	static const size_t date_display_cols = 9;
877 	static const size_t author_display_cols = 16;
878 	const int avail = view->ncols;
879 	struct tm tm;
880 	time_t committer_time;
881 
882 	committer_time = got_object_commit_get_committer_time(commit);
883 	if (localtime_r(&committer_time, &tm) == NULL)
884 		return got_error_from_errno();
885 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
886 	    >= sizeof(datebuf))
887 		return got_error(GOT_ERR_NO_SPACE);
888 
889 	if (avail < date_display_cols)
890 		limit = MIN(sizeof(datebuf) - 1, avail);
891 	else
892 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
893 	waddnstr(view->window, datebuf, limit);
894 	col = limit + 1;
895 	if (col > avail)
896 		goto done;
897 
898 	author0 = strdup(got_object_commit_get_author(commit));
899 	if (author0 == NULL) {
900 		err = got_error_from_errno();
901 		goto done;
902 	}
903 	author = author0;
904 	smallerthan = strchr(author, '<');
905 	if (smallerthan)
906 		*smallerthan = '\0';
907 	else {
908 		char *at = strchr(author, '@');
909 		if (at)
910 			*at = '\0';
911 	}
912 	limit = avail - col;
913 	err = format_line(&wauthor, &author_width, author, limit);
914 	if (err)
915 		goto done;
916 	waddwstr(view->window, wauthor);
917 	col += author_width;
918 	while (col <= avail && author_width < author_display_cols + 1) {
919 		waddch(view->window, ' ');
920 		col++;
921 		author_width++;
922 	}
923 	if (col > avail)
924 		goto done;
925 
926 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
927 	if (logmsg0 == NULL) {
928 		err = got_error_from_errno();
929 		goto done;
930 	}
931 	logmsg = logmsg0;
932 	while (*logmsg == '\n')
933 		logmsg++;
934 	newline = strchr(logmsg, '\n');
935 	if (newline)
936 		*newline = '\0';
937 	limit = avail - col;
938 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
939 	if (err)
940 		goto done;
941 	waddwstr(view->window, wlogmsg);
942 	col += logmsg_width;
943 	while (col <= avail) {
944 		waddch(view->window, ' ');
945 		col++;
946 	}
947 done:
948 	free(logmsg0);
949 	free(wlogmsg);
950 	free(author0);
951 	free(wauthor);
952 	free(line);
953 	return err;
954 }
955 
956 static struct commit_queue_entry *
957 alloc_commit_queue_entry(struct got_commit_object *commit,
958     struct got_object_id *id)
959 {
960 	struct commit_queue_entry *entry;
961 
962 	entry = calloc(1, sizeof(*entry));
963 	if (entry == NULL)
964 		return NULL;
965 
966 	entry->id = id;
967 	entry->commit = commit;
968 	return entry;
969 }
970 
971 static void
972 pop_commit(struct commit_queue *commits)
973 {
974 	struct commit_queue_entry *entry;
975 
976 	entry = TAILQ_FIRST(&commits->head);
977 	TAILQ_REMOVE(&commits->head, entry, entry);
978 	got_object_commit_close(entry->commit);
979 	commits->ncommits--;
980 	/* Don't free entry->id! It is owned by the commit graph. */
981 	free(entry);
982 }
983 
984 static void
985 free_commits(struct commit_queue *commits)
986 {
987 	while (!TAILQ_EMPTY(&commits->head))
988 		pop_commit(commits);
989 }
990 
991 static const struct got_error *
992 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
993     int minqueue, struct got_repository *repo, const char *path)
994 {
995 	const struct got_error *err = NULL;
996 	int nqueued = 0;
997 
998 	/*
999 	 * We keep all commits open throughout the lifetime of the log
1000 	 * view in order to avoid having to re-fetch commits from disk
1001 	 * while updating the display.
1002 	 */
1003 	while (nqueued < minqueue) {
1004 		struct got_object_id *id;
1005 		struct got_commit_object *commit;
1006 		struct commit_queue_entry *entry;
1007 		int errcode;
1008 
1009 		err = got_commit_graph_iter_next(&id, graph);
1010 		if (err) {
1011 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1012 				break;
1013 			err = got_commit_graph_fetch_commits(graph,
1014 			    minqueue, repo);
1015 			if (err)
1016 				return err;
1017 			continue;
1018 		}
1019 
1020 		if (id == NULL)
1021 			break;
1022 
1023 		err = got_object_open_as_commit(&commit, repo, id);
1024 		if (err)
1025 			break;
1026 		entry = alloc_commit_queue_entry(commit, id);
1027 		if (entry == NULL) {
1028 			err = got_error_from_errno();
1029 			break;
1030 		}
1031 
1032 		errcode = pthread_mutex_lock(&tog_mutex);
1033 		if (errcode) {
1034 			err = got_error_set_errno(errcode);
1035 			break;
1036 		}
1037 
1038 		entry->idx = commits->ncommits;
1039 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1040 		nqueued++;
1041 		commits->ncommits++;
1042 
1043 		errcode = pthread_mutex_unlock(&tog_mutex);
1044 		if (errcode && err == NULL)
1045 			err = got_error_set_errno(errcode);
1046 	}
1047 
1048 	return err;
1049 }
1050 
1051 static const struct got_error *
1052 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
1053 {
1054 	const struct got_error *err = NULL;
1055 	struct got_reference *head_ref;
1056 
1057 	*head_id = NULL;
1058 
1059 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1060 	if (err)
1061 		return err;
1062 
1063 	err = got_ref_resolve(head_id, repo, head_ref);
1064 	got_ref_close(head_ref);
1065 	if (err) {
1066 		*head_id = NULL;
1067 		return err;
1068 	}
1069 
1070 	return NULL;
1071 }
1072 
1073 static const struct got_error *
1074 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1075     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1076     struct commit_queue *commits, int selected_idx, int limit,
1077     const char *path, int commits_needed)
1078 {
1079 	const struct got_error *err = NULL;
1080 	struct commit_queue_entry *entry;
1081 	int ncommits, width;
1082 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1083 	wchar_t *wline;
1084 
1085 	entry = first;
1086 	ncommits = 0;
1087 	while (entry) {
1088 		if (ncommits == selected_idx) {
1089 			*selected = entry;
1090 			break;
1091 		}
1092 		entry = TAILQ_NEXT(entry, entry);
1093 		ncommits++;
1094 	}
1095 
1096 	if (*selected) {
1097 		err = got_object_id_str(&id_str, (*selected)->id);
1098 		if (err)
1099 			return err;
1100 	}
1101 
1102 	if (asprintf(&ncommits_str, " [%d/%d]%s ",
1103 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1104 	    commits_needed == 0 ? "" : " loading...") == -1)
1105 		return got_error_from_errno();
1106 
1107 	if (path && strcmp(path, "/") != 0) {
1108 		if (asprintf(&header, "commit %s %s%s",
1109 		    id_str ? id_str : "........................................",
1110 		    path, ncommits_str) == -1) {
1111 			err = got_error_from_errno();
1112 			header = NULL;
1113 			goto done;
1114 		}
1115 	} else if (asprintf(&header, "commit %s%s",
1116 	    id_str ? id_str : "........................................",
1117 	    ncommits_str) == -1) {
1118 		err = got_error_from_errno();
1119 		header = NULL;
1120 		goto done;
1121 	}
1122 	err = format_line(&wline, &width, header, view->ncols);
1123 	if (err)
1124 		goto done;
1125 
1126 	werase(view->window);
1127 
1128 	if (view_needs_focus_indication(view))
1129 		wstandout(view->window);
1130 	waddwstr(view->window, wline);
1131 	while (width < view->ncols) {
1132 		waddch(view->window, ' ');
1133 		width++;
1134 	}
1135 	if (view_needs_focus_indication(view))
1136 		wstandend(view->window);
1137 	free(wline);
1138 	if (limit <= 1)
1139 		goto done;
1140 
1141 	entry = first;
1142 	*last = first;
1143 	ncommits = 0;
1144 	while (entry) {
1145 		if (ncommits >= limit - 1)
1146 			break;
1147 		if (view->focussed && ncommits == selected_idx)
1148 			wstandout(view->window);
1149 		err = draw_commit(view, entry->commit, entry->id);
1150 		if (view->focussed && ncommits == selected_idx)
1151 			wstandend(view->window);
1152 		if (err)
1153 			break;
1154 		ncommits++;
1155 		*last = entry;
1156 		entry = TAILQ_NEXT(entry, entry);
1157 	}
1158 
1159 	view_vborder(view);
1160 done:
1161 	free(id_str);
1162 	free(ncommits_str);
1163 	free(header);
1164 	return err;
1165 }
1166 
1167 static void
1168 scroll_up(struct commit_queue_entry **first_displayed_entry, int maxscroll,
1169     struct commit_queue *commits)
1170 {
1171 	struct commit_queue_entry *entry;
1172 	int nscrolled = 0;
1173 
1174 	entry = TAILQ_FIRST(&commits->head);
1175 	if (*first_displayed_entry == entry)
1176 		return;
1177 
1178 	entry = *first_displayed_entry;
1179 	while (entry && nscrolled < maxscroll) {
1180 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1181 		if (entry) {
1182 			*first_displayed_entry = entry;
1183 			nscrolled++;
1184 		}
1185 	}
1186 }
1187 
1188 static const struct got_error *
1189 scroll_down(struct commit_queue_entry **first_displayed_entry, int maxscroll,
1190     struct commit_queue_entry **last_displayed_entry,
1191     struct commit_queue *commits, int *log_complete, int *commits_needed,
1192     pthread_cond_t *need_commits)
1193 {
1194 	const struct got_error *err = NULL;
1195 	struct commit_queue_entry *pentry;
1196 	int nscrolled = 0;
1197 
1198 	if (*last_displayed_entry == NULL)
1199 		return NULL;
1200 
1201 	do {
1202 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1203 		if (pentry == NULL) {
1204 			int errcode;
1205 			if (*log_complete)
1206 				return NULL;
1207 			*commits_needed = maxscroll + 20;
1208 			errcode = pthread_cond_signal(need_commits);
1209 			if (errcode)
1210 				return got_error_set_errno(errcode);
1211 			return NULL;
1212 		}
1213 		*last_displayed_entry = pentry;
1214 
1215 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1216 		if (pentry == NULL)
1217 			break;
1218 		*first_displayed_entry = pentry;
1219 	} while (++nscrolled < maxscroll);
1220 
1221 	return err;
1222 }
1223 
1224 static const struct got_error *
1225 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1226     struct got_object_id *commit_id, struct got_commit_object *commit,
1227     struct got_repository *repo)
1228 {
1229 	const struct got_error *err;
1230 	struct got_object_qid *parent_id;
1231 	struct tog_view *diff_view;
1232 
1233 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1234 	if (diff_view == NULL)
1235 		return got_error_from_errno();
1236 
1237 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1238 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1239 	    commit_id, repo);
1240 	if (err == NULL)
1241 		*new_view = diff_view;
1242 	return err;
1243 }
1244 
1245 static const struct got_error *
1246 browse_commit(struct tog_view **new_view, int begin_x,
1247     struct commit_queue_entry *entry, struct got_repository *repo)
1248 {
1249 	const struct got_error *err = NULL;
1250 	struct got_tree_object *tree;
1251 	struct tog_view *tree_view;
1252 
1253 	err = got_object_open_as_tree(&tree, repo,
1254 	    got_object_commit_get_tree_id(entry->commit));
1255 	if (err)
1256 		return err;
1257 
1258 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1259 	if (tree_view == NULL)
1260 		return got_error_from_errno();
1261 
1262 	err = open_tree_view(tree_view, tree, entry->id, repo);
1263 	if (err)
1264 		got_object_tree_close(tree);
1265 	else
1266 		*new_view = tree_view;
1267 	return err;
1268 }
1269 
1270 static void *
1271 log_thread(void *arg)
1272 {
1273 	const struct got_error *err = NULL;
1274 	int errcode = 0;
1275 	struct tog_log_thread_args *a = arg;
1276 	int done = 0;
1277 
1278 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1279 	if (err)
1280 		return (void *)err;
1281 
1282 	while (!done && !err) {
1283 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1284 		    a->in_repo_path);
1285 		if (err) {
1286 			if (err->code != GOT_ERR_ITER_COMPLETED)
1287 				return (void *)err;
1288 			err = NULL;
1289 			done = 1;
1290 		} else if (a->commits_needed > 0)
1291 			a->commits_needed--;
1292 
1293 		errcode = pthread_mutex_lock(&tog_mutex);
1294 		if (errcode)
1295 			return (void *)got_error_set_errno(errcode);
1296 
1297 		if (done)
1298 			a->log_complete = 1;
1299 		else if (*a->quit) {
1300 			done = 1;
1301 			a->log_complete = 1;
1302 		} else if (*a->first_displayed_entry == NULL) {
1303 			*a->first_displayed_entry =
1304 			    TAILQ_FIRST(&a->commits->head);
1305 			*a->selected_entry = *a->first_displayed_entry;
1306 		}
1307 
1308 		if (done)
1309 			a->commits_needed = 0;
1310 		else if (a->commits_needed == 0) {
1311 			errcode = pthread_cond_wait(&a->need_commits,
1312 			    &tog_mutex);
1313 			if (errcode)
1314 				err = got_error_set_errno(errcode);
1315 		}
1316 
1317 		errcode = pthread_mutex_unlock(&tog_mutex);
1318 		if (errcode && err == NULL)
1319 			err = got_error_set_errno(errcode);
1320 	}
1321 	return (void *)err;
1322 }
1323 
1324 static const struct got_error *
1325 stop_log_thread(struct tog_log_view_state *s)
1326 {
1327 	const struct got_error *err = NULL;
1328 	int errcode;
1329 
1330 	if (s->thread) {
1331 		s->quit = 1;
1332 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1333 		if (errcode)
1334 			return got_error_set_errno(errcode);
1335 		errcode = pthread_mutex_unlock(&tog_mutex);
1336 		if (errcode)
1337 			return got_error_set_errno(errcode);
1338 		errcode = pthread_join(s->thread, (void **)&err);
1339 		if (errcode)
1340 			return got_error_set_errno(errcode);
1341 		errcode = pthread_mutex_lock(&tog_mutex);
1342 		if (errcode)
1343 			return got_error_set_errno(errcode);
1344 		s->thread = NULL;
1345 	}
1346 
1347 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1348 	if (errcode && err == NULL)
1349 		err = got_error_set_errno(errcode);
1350 
1351 	if (s->thread_args.repo) {
1352 		got_repo_close(s->thread_args.repo);
1353 		s->thread_args.repo = NULL;
1354 	}
1355 
1356 	if (s->thread_args.graph) {
1357 		got_commit_graph_close(s->thread_args.graph);
1358 		s->thread_args.graph = NULL;
1359 	}
1360 
1361 	return err;
1362 }
1363 
1364 static const struct got_error *
1365 close_log_view(struct tog_view *view)
1366 {
1367 	const struct got_error *err = NULL;
1368 	struct tog_log_view_state *s = &view->state.log;
1369 
1370 	err = stop_log_thread(s);
1371 	free_commits(&s->commits);
1372 	free(s->in_repo_path);
1373 	s->in_repo_path = NULL;
1374 	free(s->start_id);
1375 	s->start_id = NULL;
1376 	return err;
1377 }
1378 
1379 static const struct got_error *
1380 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1381     struct got_repository *repo, const char *path, int check_disk)
1382 {
1383 	const struct got_error *err = NULL;
1384 	struct tog_log_view_state *s = &view->state.log;
1385 	struct got_repository *thread_repo = NULL;
1386 	struct got_commit_graph *thread_graph = NULL;
1387 	int errcode;
1388 
1389 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1390 	if (err != NULL)
1391 		goto done;
1392 
1393 	/* The commit queue only contains commits being displayed. */
1394 	TAILQ_INIT(&s->commits.head);
1395 	s->commits.ncommits = 0;
1396 
1397 	s->repo = repo;
1398 	s->start_id = got_object_id_dup(start_id);
1399 	if (s->start_id == NULL) {
1400 		err = got_error_from_errno();
1401 		goto done;
1402 	}
1403 
1404 	view->show = show_log_view;
1405 	view->input = input_log_view;
1406 	view->close = close_log_view;
1407 
1408 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1409 	if (err)
1410 		goto done;
1411 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1412 	    0, thread_repo);
1413 	if (err)
1414 		goto done;
1415 
1416 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1417 	if (errcode) {
1418 		err = got_error_set_errno(errcode);
1419 		goto done;
1420 	}
1421 
1422 	s->thread_args.commits_needed = view->nlines;
1423 	s->thread_args.graph = thread_graph;
1424 	s->thread_args.commits = &s->commits;
1425 	s->thread_args.in_repo_path = s->in_repo_path;
1426 	s->thread_args.start_id = s->start_id;
1427 	s->thread_args.repo = thread_repo;
1428 	s->thread_args.log_complete = 0;
1429 	s->thread_args.quit = &s->quit;
1430 	s->thread_args.view = view;
1431 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1432 	s->thread_args.selected_entry = &s->selected_entry;
1433 done:
1434 	if (err)
1435 		close_log_view(view);
1436 	return err;
1437 }
1438 
1439 static const struct got_error *
1440 show_log_view(struct tog_view *view)
1441 {
1442 	struct tog_log_view_state *s = &view->state.log;
1443 
1444 	if (s->thread == NULL) {
1445 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1446 		    &s->thread_args);
1447 		if (errcode)
1448 			return got_error_set_errno(errcode);
1449 	}
1450 
1451 	return draw_commits(view, &s->last_displayed_entry,
1452 	    &s->selected_entry, s->first_displayed_entry,
1453 	    &s->commits, s->selected, view->nlines,
1454 	    s->in_repo_path, s->thread_args.commits_needed);
1455 }
1456 
1457 static const struct got_error *
1458 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1459     struct tog_view **focus_view, struct tog_view *view, int ch)
1460 {
1461 	const struct got_error *err = NULL;
1462 	struct tog_log_view_state *s = &view->state.log;
1463 	char *parent_path;
1464 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1465 	int begin_x = 0;
1466 
1467 	switch (ch) {
1468 		case 'q':
1469 			s->quit = 1;
1470 			break;
1471 		case 'k':
1472 		case KEY_UP:
1473 			if (s->first_displayed_entry == NULL)
1474 				break;
1475 			if (s->selected > 0)
1476 				s->selected--;
1477 			if (s->selected > 0)
1478 				break;
1479 			scroll_up(&s->first_displayed_entry, 1,
1480 			    &s->commits);
1481 			break;
1482 		case KEY_PPAGE:
1483 			if (s->first_displayed_entry == NULL)
1484 				break;
1485 			if (TAILQ_FIRST(&s->commits.head) ==
1486 			    s->first_displayed_entry) {
1487 				s->selected = 0;
1488 				break;
1489 			}
1490 			scroll_up(&s->first_displayed_entry,
1491 			    view->nlines, &s->commits);
1492 			break;
1493 		case 'j':
1494 		case KEY_DOWN:
1495 			if (s->first_displayed_entry == NULL)
1496 				break;
1497 			if (s->selected < MIN(view->nlines - 2,
1498 			    s->commits.ncommits - 1)) {
1499 				s->selected++;
1500 				break;
1501 			}
1502 			err = scroll_down(&s->first_displayed_entry, 1,
1503 			    &s->last_displayed_entry, &s->commits,
1504 			    &s->thread_args.log_complete,
1505 			    &s->thread_args.commits_needed,
1506 			    &s->thread_args.need_commits);
1507 			break;
1508 		case KEY_NPAGE: {
1509 			struct commit_queue_entry *first;
1510 			first = s->first_displayed_entry;
1511 			if (first == NULL)
1512 				break;
1513 			err = scroll_down(&s->first_displayed_entry,
1514 			    view->nlines, &s->last_displayed_entry,
1515 			    &s->commits, &s->thread_args.log_complete,
1516 			    &s->thread_args.commits_needed,
1517 			    &s->thread_args.need_commits);
1518 			if (first == s->first_displayed_entry &&
1519 			    s->selected < MIN(view->nlines - 2,
1520 			    s->commits.ncommits - 1)) {
1521 				/* can't scroll further down */
1522 				s->selected = MIN(view->nlines - 2,
1523 				    s->commits.ncommits - 1);
1524 			}
1525 			err = NULL;
1526 			break;
1527 		}
1528 		case KEY_RESIZE:
1529 			if (s->selected > view->nlines - 2)
1530 				s->selected = view->nlines - 2;
1531 			if (s->selected > s->commits.ncommits - 1)
1532 				s->selected = s->commits.ncommits - 1;
1533 			break;
1534 		case KEY_ENTER:
1535 		case '\r':
1536 			if (s->selected_entry == NULL)
1537 				break;
1538 			if (view_is_parent_view(view))
1539 				begin_x = view_split_begin_x(view->begin_x);
1540 			err = open_diff_view_for_commit(&diff_view, begin_x,
1541 			    s->selected_entry->id, s->selected_entry->commit,
1542 			    s->repo);
1543 			if (err)
1544 				break;
1545 			if (view_is_parent_view(view)) {
1546 				err = view_close_child(view);
1547 				if (err)
1548 					return err;
1549 				err = view_set_child(view, diff_view);
1550 				if (err) {
1551 					view_close(diff_view);
1552 					break;
1553 				}
1554 				*focus_view = diff_view;
1555 				view->child_focussed = 1;
1556 			} else
1557 				*new_view = diff_view;
1558 			break;
1559 		case 't':
1560 			if (s->selected_entry == NULL)
1561 				break;
1562 			if (view_is_parent_view(view))
1563 				begin_x = view_split_begin_x(view->begin_x);
1564 			err = browse_commit(&tree_view, begin_x,
1565 			    s->selected_entry, s->repo);
1566 			if (err)
1567 				break;
1568 			if (view_is_parent_view(view)) {
1569 				err = view_close_child(view);
1570 				if (err)
1571 					return err;
1572 				err = view_set_child(view, tree_view);
1573 				if (err) {
1574 					view_close(tree_view);
1575 					break;
1576 				}
1577 				*focus_view = tree_view;
1578 				view->child_focussed = 1;
1579 			} else
1580 				*new_view = tree_view;
1581 			break;
1582 		case KEY_BACKSPACE:
1583 			if (strcmp(s->in_repo_path, "/") == 0)
1584 				break;
1585 			parent_path = dirname(s->in_repo_path);
1586 			if (parent_path && strcmp(parent_path, ".") != 0) {
1587 				struct tog_view *lv;
1588 				err = stop_log_thread(s);
1589 				if (err)
1590 					return err;
1591 				lv = view_open(view->nlines, view->ncols,
1592 				    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1593 				if (lv == NULL)
1594 					return got_error_from_errno();
1595 				err = open_log_view(lv, s->start_id, s->repo,
1596 				    parent_path, 0);
1597 				if (err)
1598 					return err;;
1599 				if (view_is_parent_view(view))
1600 					*new_view = lv;
1601 				else {
1602 					view_set_child(view->parent, lv);
1603 					*focus_view = lv;
1604 				}
1605 				return NULL;
1606 			}
1607 			break;
1608 		default:
1609 			break;
1610 	}
1611 
1612 	return err;
1613 }
1614 
1615 static const struct got_error *
1616 apply_unveil(const char *repo_path, const char *worktree_path)
1617 {
1618 	const struct got_error *error;
1619 
1620 	if (repo_path && unveil(repo_path, "r") != 0)
1621 		return got_error_from_errno();
1622 
1623 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1624 		return got_error_from_errno();
1625 
1626 	if (unveil("/tmp", "rwc") != 0)
1627 		return got_error_from_errno();
1628 
1629 	error = got_privsep_unveil_exec_helpers();
1630 	if (error != NULL)
1631 		return error;
1632 
1633 	if (unveil(NULL, NULL) != 0)
1634 		return got_error_from_errno();
1635 
1636 	return NULL;
1637 }
1638 
1639 static void
1640 init_curses(void)
1641 {
1642 	initscr();
1643 	cbreak();
1644 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1645 	noecho();
1646 	nonl();
1647 	intrflush(stdscr, FALSE);
1648 	keypad(stdscr, TRUE);
1649 	curs_set(0);
1650 	signal(SIGWINCH, tog_sigwinch);
1651 }
1652 
1653 static const struct got_error *
1654 cmd_log(int argc, char *argv[])
1655 {
1656 	const struct got_error *error;
1657 	struct got_repository *repo = NULL;
1658 	struct got_object_id *start_id = NULL;
1659 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1660 	char *start_commit = NULL;
1661 	int ch;
1662 	struct tog_view *view;
1663 
1664 #ifndef PROFILE
1665 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1666 	    NULL) == -1)
1667 		err(1, "pledge");
1668 #endif
1669 
1670 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1671 		switch (ch) {
1672 		case 'c':
1673 			start_commit = optarg;
1674 			break;
1675 		case 'r':
1676 			repo_path = realpath(optarg, NULL);
1677 			if (repo_path == NULL)
1678 				err(1, "-r option");
1679 			break;
1680 		default:
1681 			usage();
1682 			/* NOTREACHED */
1683 		}
1684 	}
1685 
1686 	argc -= optind;
1687 	argv += optind;
1688 
1689 	if (argc == 0)
1690 		path = strdup("");
1691 	else if (argc == 1)
1692 		path = strdup(argv[0]);
1693 	else
1694 		usage_log();
1695 	if (path == NULL)
1696 		return got_error_from_errno();
1697 
1698 	cwd = getcwd(NULL, 0);
1699 	if (cwd == NULL) {
1700 		error = got_error_from_errno();
1701 		goto done;
1702 	}
1703 	if (repo_path == NULL) {
1704 		struct got_worktree *worktree;
1705 		error = got_worktree_open(&worktree, cwd);
1706 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
1707 			goto done;
1708 		if (worktree) {
1709 			repo_path =
1710 			    strdup(got_worktree_get_repo_path(worktree));
1711 			got_worktree_close(worktree);
1712 		} else
1713 			repo_path = strdup(cwd);
1714 		if (repo_path == NULL) {
1715 			error = got_error_from_errno();
1716 			goto done;
1717 		}
1718 	}
1719 
1720 	init_curses();
1721 
1722 	error = apply_unveil(repo_path, NULL);
1723 	if (error)
1724 		goto done;
1725 
1726 	error = got_repo_open(&repo, repo_path);
1727 	if (error != NULL)
1728 		goto done;
1729 
1730 	if (start_commit == NULL)
1731 		error = get_head_commit_id(&start_id, repo);
1732 	else
1733 		error = got_object_resolve_id_str(&start_id, repo,
1734 		    start_commit);
1735 	if (error != NULL)
1736 		goto done;
1737 
1738 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1739 	if (view == NULL) {
1740 		error = got_error_from_errno();
1741 		goto done;
1742 	}
1743 	error = open_log_view(view, start_id, repo, path, 1);
1744 	if (error)
1745 		goto done;
1746 	error = view_loop(view);
1747 done:
1748 	free(repo_path);
1749 	free(cwd);
1750 	free(path);
1751 	free(start_id);
1752 	if (repo)
1753 		got_repo_close(repo);
1754 	return error;
1755 }
1756 
1757 __dead static void
1758 usage_diff(void)
1759 {
1760 	endwin();
1761 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1762 	    getprogname());
1763 	exit(1);
1764 }
1765 
1766 static char *
1767 parse_next_line(FILE *f, size_t *len)
1768 {
1769 	char *line;
1770 	size_t linelen;
1771 	size_t lineno;
1772 	const char delim[3] = { '\0', '\0', '\0'};
1773 
1774 	line = fparseln(f, &linelen, &lineno, delim, 0);
1775 	if (len)
1776 		*len = linelen;
1777 	return line;
1778 }
1779 
1780 static const struct got_error *
1781 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1782     int *last_displayed_line, int *eof, int max_lines,
1783     char * header)
1784 {
1785 	const struct got_error *err;
1786 	int nlines = 0, nprinted = 0;
1787 	char *line;
1788 	size_t len;
1789 	wchar_t *wline;
1790 	int width;
1791 
1792 	rewind(f);
1793 	werase(view->window);
1794 
1795 	if (header) {
1796 		err = format_line(&wline, &width, header, view->ncols);
1797 		if (err) {
1798 			return err;
1799 		}
1800 
1801 		if (view_needs_focus_indication(view))
1802 			wstandout(view->window);
1803 		waddwstr(view->window, wline);
1804 		if (view_needs_focus_indication(view))
1805 			wstandend(view->window);
1806 		if (width < view->ncols)
1807 			waddch(view->window, '\n');
1808 
1809 		if (max_lines <= 1)
1810 			return NULL;
1811 		max_lines--;
1812 	}
1813 
1814 	*eof = 0;
1815 	while (nprinted < max_lines) {
1816 		line = parse_next_line(f, &len);
1817 		if (line == NULL) {
1818 			*eof = 1;
1819 			break;
1820 		}
1821 		if (++nlines < *first_displayed_line) {
1822 			free(line);
1823 			continue;
1824 		}
1825 
1826 		err = format_line(&wline, &width, line, view->ncols);
1827 		if (err) {
1828 			free(line);
1829 			return err;
1830 		}
1831 		waddwstr(view->window, wline);
1832 		if (width < view->ncols)
1833 			waddch(view->window, '\n');
1834 		if (++nprinted == 1)
1835 			*first_displayed_line = nlines;
1836 		free(line);
1837 		free(wline);
1838 		wline = NULL;
1839 	}
1840 	*last_displayed_line = nlines;
1841 
1842 	view_vborder(view);
1843 
1844 	return NULL;
1845 }
1846 
1847 static char *
1848 get_datestr(time_t *time, char *datebuf)
1849 {
1850 	char *p, *s = ctime_r(time, datebuf);
1851 	p = strchr(s, '\n');
1852 	if (p)
1853 		*p = '\0';
1854 	return s;
1855 }
1856 
1857 static const struct got_error *
1858 write_commit_info(struct got_object_id *commit_id, struct got_repository *repo,
1859     FILE *outfile)
1860 {
1861 	const struct got_error *err = NULL;
1862 	char datebuf[26];
1863 	struct got_commit_object *commit;
1864 	char *id_str = NULL;
1865 	time_t committer_time;
1866 	const char *author, *committer;
1867 
1868 	err = got_object_open_as_commit(&commit, repo, commit_id);
1869 	if (err)
1870 		return err;
1871 
1872 	err = got_object_id_str(&id_str, commit_id);
1873 	if (err) {
1874 		err = got_error_from_errno();
1875 		goto done;
1876 	}
1877 
1878 	if (fprintf(outfile, "commit %s\n", id_str) < 0) {
1879 		err = got_error_from_errno();
1880 		goto done;
1881 	}
1882 	if (fprintf(outfile, "from: %s\n",
1883 	    got_object_commit_get_author(commit)) < 0) {
1884 		err = got_error_from_errno();
1885 		goto done;
1886 	}
1887 	committer_time = got_object_commit_get_committer_time(commit);
1888 	if (fprintf(outfile, "date: %s UTC\n",
1889 	    get_datestr(&committer_time, datebuf)) < 0) {
1890 		err = got_error_from_errno();
1891 		goto done;
1892 	}
1893 	author = got_object_commit_get_author(commit);
1894 	committer = got_object_commit_get_committer(commit);
1895 	if (strcmp(author, committer) != 0 &&
1896 	    fprintf(outfile, "via: %s\n", committer) < 0) {
1897 		err = got_error_from_errno();
1898 		goto done;
1899 	}
1900 	if (fprintf(outfile, "%s\n",
1901 	    got_object_commit_get_logmsg(commit)) < 0) {
1902 		err = got_error_from_errno();
1903 		goto done;
1904 	}
1905 done:
1906 	free(id_str);
1907 	got_object_commit_close(commit);
1908 	return err;
1909 }
1910 
1911 static const struct got_error *
1912 create_diff(struct tog_diff_view_state *s)
1913 {
1914 	const struct got_error *err = NULL;
1915 	FILE *f = NULL;
1916 	int obj_type;
1917 
1918 	f = got_opentemp();
1919 	if (f == NULL) {
1920 		err = got_error_from_errno();
1921 		goto done;
1922 	}
1923 	if (s->f)
1924 		fclose(s->f);
1925 	s->f = f;
1926 
1927 	if (s->id1)
1928 		err = got_object_get_type(&obj_type, s->repo, s->id1);
1929 	else
1930 		err = got_object_get_type(&obj_type, s->repo, s->id2);
1931 	if (err)
1932 		goto done;
1933 
1934 	switch (obj_type) {
1935 	case GOT_OBJ_TYPE_BLOB:
1936 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
1937 		    s->diff_context, s->repo, f);
1938 		break;
1939 	case GOT_OBJ_TYPE_TREE:
1940 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
1941 		    s->diff_context, s->repo, f);
1942 		break;
1943 	case GOT_OBJ_TYPE_COMMIT: {
1944 		const struct got_object_id_queue *parent_ids;
1945 		struct got_object_qid *pid;
1946 		struct got_commit_object *commit2;
1947 
1948 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
1949 		if (err)
1950 			break;
1951 		/* Show commit info if we're diffing to a parent commit. */
1952 		parent_ids = got_object_commit_get_parent_ids(commit2);
1953 		SIMPLEQ_FOREACH(pid, parent_ids, entry) {
1954 			if (got_object_id_cmp(s->id1, pid->id) == 0) {
1955 				write_commit_info(s->id2, s->repo, f);
1956 				break;
1957 			}
1958 		}
1959 		got_object_commit_close(commit2);
1960 
1961 		err = got_diff_objects_as_commits(s->id1, s->id2,
1962 		    s->diff_context, s->repo, f);
1963 		break;
1964 	}
1965 	default:
1966 		err = got_error(GOT_ERR_OBJ_TYPE);
1967 		break;
1968 	}
1969 done:
1970 	if (f)
1971 		fflush(f);
1972 	return err;
1973 }
1974 
1975 static const struct got_error *
1976 open_diff_view(struct tog_view *view, struct got_object_id *id1,
1977     struct got_object_id *id2, struct got_repository *repo)
1978 {
1979 	const struct got_error *err;
1980 
1981 	if (id1 != NULL && id2 != NULL) {
1982 	    int type1, type2;
1983 	    err = got_object_get_type(&type1, repo, id1);
1984 	    if (err)
1985 		return err;
1986 	    err = got_object_get_type(&type2, repo, id2);
1987 	    if (err)
1988 		return err;
1989 
1990 	    if (type1 != type2)
1991 		return got_error(GOT_ERR_OBJ_TYPE);
1992 	}
1993 
1994 	if (id1) {
1995 		view->state.diff.id1 = got_object_id_dup(id1);
1996 		if (view->state.diff.id1 == NULL)
1997 			return got_error_from_errno();
1998 	} else
1999 		view->state.diff.id1 = NULL;
2000 
2001 	view->state.diff.id2 = got_object_id_dup(id2);
2002 	if (view->state.diff.id2 == NULL) {
2003 		free(view->state.diff.id1);
2004 		view->state.diff.id1 = NULL;
2005 		return got_error_from_errno();
2006 	}
2007 	view->state.diff.f = NULL;
2008 	view->state.diff.first_displayed_line = 1;
2009 	view->state.diff.last_displayed_line = view->nlines;
2010 	view->state.diff.diff_context = 3;
2011 	view->state.diff.repo = repo;
2012 
2013 	err = create_diff(&view->state.diff);
2014 	if (err) {
2015 		free(view->state.diff.id1);
2016 		view->state.diff.id1 = NULL;
2017 		free(view->state.diff.id2);
2018 		view->state.diff.id2 = NULL;
2019 		return err;
2020 	}
2021 
2022 	view->show = show_diff_view;
2023 	view->input = input_diff_view;
2024 	view->close = close_diff_view;
2025 
2026 	return NULL;
2027 }
2028 
2029 static const struct got_error *
2030 close_diff_view(struct tog_view *view)
2031 {
2032 	const struct got_error *err = NULL;
2033 
2034 	free(view->state.diff.id1);
2035 	view->state.diff.id1 = NULL;
2036 	free(view->state.diff.id2);
2037 	view->state.diff.id2 = NULL;
2038 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2039 		err = got_error_from_errno();
2040 	return err;
2041 }
2042 
2043 static const struct got_error *
2044 show_diff_view(struct tog_view *view)
2045 {
2046 	const struct got_error *err;
2047 	struct tog_diff_view_state *s = &view->state.diff;
2048 	char *id_str1 = NULL, *id_str2, *header;
2049 
2050 	if (s->id1) {
2051 		err = got_object_id_str(&id_str1, s->id1);
2052 		if (err)
2053 			return err;
2054 	}
2055 	err = got_object_id_str(&id_str2, s->id2);
2056 	if (err)
2057 		return err;
2058 
2059 	if (asprintf(&header, "diff %s %s",
2060 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2061 		err = got_error_from_errno();
2062 		free(id_str1);
2063 		free(id_str2);
2064 		return err;
2065 	}
2066 	free(id_str1);
2067 	free(id_str2);
2068 
2069 	return draw_file(view, s->f, &s->first_displayed_line,
2070 	    &s->last_displayed_line, &s->eof, view->nlines,
2071 	    header);
2072 }
2073 
2074 static const struct got_error *
2075 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2076     struct tog_view **focus_view, struct tog_view *view, int ch)
2077 {
2078 	const struct got_error *err = NULL;
2079 	struct tog_diff_view_state *s = &view->state.diff;
2080 	int i;
2081 
2082 	switch (ch) {
2083 		case 'k':
2084 		case KEY_UP:
2085 			if (s->first_displayed_line > 1)
2086 				s->first_displayed_line--;
2087 			break;
2088 		case KEY_PPAGE:
2089 			i = 0;
2090 			while (i++ < view->nlines - 1 &&
2091 			    s->first_displayed_line > 1)
2092 				s->first_displayed_line--;
2093 			break;
2094 		case 'j':
2095 		case KEY_DOWN:
2096 			if (!s->eof)
2097 				s->first_displayed_line++;
2098 			break;
2099 		case KEY_NPAGE:
2100 		case ' ':
2101 			i = 0;
2102 			while (!s->eof && i++ < view->nlines - 1) {
2103 				char *line;
2104 				line = parse_next_line(s->f, NULL);
2105 				s->first_displayed_line++;
2106 				if (line == NULL)
2107 					break;
2108 			}
2109 			break;
2110 		case '[':
2111 			if (s->diff_context > 0) {
2112 				s->diff_context--;
2113 				err = create_diff(s);
2114 			}
2115 			break;
2116 		case ']':
2117 			if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2118 				s->diff_context++;
2119 				err = create_diff(s);
2120 			}
2121 			break;
2122 		default:
2123 			break;
2124 	}
2125 
2126 	return err;
2127 }
2128 
2129 static const struct got_error *
2130 cmd_diff(int argc, char *argv[])
2131 {
2132 	const struct got_error *error = NULL;
2133 	struct got_repository *repo = NULL;
2134 	struct got_object_id *id1 = NULL, *id2 = NULL;
2135 	char *repo_path = NULL;
2136 	char *id_str1 = NULL, *id_str2 = NULL;
2137 	int ch;
2138 	struct tog_view *view;
2139 
2140 #ifndef PROFILE
2141 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2142 	    NULL) == -1)
2143 		err(1, "pledge");
2144 #endif
2145 
2146 	while ((ch = getopt(argc, argv, "")) != -1) {
2147 		switch (ch) {
2148 		default:
2149 			usage();
2150 			/* NOTREACHED */
2151 		}
2152 	}
2153 
2154 	argc -= optind;
2155 	argv += optind;
2156 
2157 	if (argc == 0) {
2158 		usage_diff(); /* TODO show local worktree changes */
2159 	} else if (argc == 2) {
2160 		repo_path = getcwd(NULL, 0);
2161 		if (repo_path == NULL)
2162 			return got_error_from_errno();
2163 		id_str1 = argv[0];
2164 		id_str2 = argv[1];
2165 	} else if (argc == 3) {
2166 		repo_path = realpath(argv[0], NULL);
2167 		if (repo_path == NULL)
2168 			return got_error_from_errno();
2169 		id_str1 = argv[1];
2170 		id_str2 = argv[2];
2171 	} else
2172 		usage_diff();
2173 
2174 	init_curses();
2175 
2176 	error = apply_unveil(repo_path, NULL);
2177 	if (error)
2178 		goto done;
2179 
2180 	error = got_repo_open(&repo, repo_path);
2181 	free(repo_path);
2182 	if (error)
2183 		goto done;
2184 
2185 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2186 	if (error)
2187 		goto done;
2188 
2189 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2190 	if (error)
2191 		goto done;
2192 
2193 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2194 	if (view == NULL) {
2195 		error = got_error_from_errno();
2196 		goto done;
2197 	}
2198 	error = open_diff_view(view, id1, id2, repo);
2199 	if (error)
2200 		goto done;
2201 	error = view_loop(view);
2202 done:
2203 	got_repo_close(repo);
2204 	return error;
2205 }
2206 
2207 __dead static void
2208 usage_blame(void)
2209 {
2210 	endwin();
2211 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2212 	    getprogname());
2213 	exit(1);
2214 }
2215 
2216 struct tog_blame_line {
2217 	int annotated;
2218 	struct got_object_id *id;
2219 };
2220 
2221 static const struct got_error *
2222 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2223     const char *path, struct tog_blame_line *lines, int nlines,
2224     int blame_complete, int selected_line, int *first_displayed_line,
2225     int *last_displayed_line, int *eof, int max_lines)
2226 {
2227 	const struct got_error *err;
2228 	int lineno = 0, nprinted = 0;
2229 	char *line;
2230 	size_t len;
2231 	wchar_t *wline;
2232 	int width, wlimit;
2233 	struct tog_blame_line *blame_line;
2234 	struct got_object_id *prev_id = NULL;
2235 	char *id_str;
2236 
2237 	err = got_object_id_str(&id_str, id);
2238 	if (err)
2239 		return err;
2240 
2241 	rewind(f);
2242 	werase(view->window);
2243 
2244 	if (asprintf(&line, "commit %s", id_str) == -1) {
2245 		err = got_error_from_errno();
2246 		free(id_str);
2247 		return err;
2248 	}
2249 
2250 	err = format_line(&wline, &width, line, view->ncols);
2251 	free(line);
2252 	line = NULL;
2253 	if (view_needs_focus_indication(view))
2254 		wstandout(view->window);
2255 	waddwstr(view->window, wline);
2256 	if (view_needs_focus_indication(view))
2257 		wstandend(view->window);
2258 	free(wline);
2259 	wline = NULL;
2260 	if (width < view->ncols)
2261 		waddch(view->window, '\n');
2262 
2263 	if (asprintf(&line, "[%d/%d] %s%s",
2264 	    *first_displayed_line - 1 + selected_line, nlines,
2265 	    blame_complete ? "" : "annotating ", path) == -1) {
2266 		free(id_str);
2267 		return got_error_from_errno();
2268 	}
2269 	free(id_str);
2270 	err = format_line(&wline, &width, line, view->ncols);
2271 	free(line);
2272 	line = NULL;
2273 	if (err)
2274 		return err;
2275 	waddwstr(view->window, wline);
2276 	free(wline);
2277 	wline = NULL;
2278 	if (width < view->ncols)
2279 		waddch(view->window, '\n');
2280 
2281 	*eof = 0;
2282 	while (nprinted < max_lines - 2) {
2283 		line = parse_next_line(f, &len);
2284 		if (line == NULL) {
2285 			*eof = 1;
2286 			break;
2287 		}
2288 		if (++lineno < *first_displayed_line) {
2289 			free(line);
2290 			continue;
2291 		}
2292 
2293 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2294 		err = format_line(&wline, &width, line, wlimit);
2295 		if (err) {
2296 			free(line);
2297 			return err;
2298 		}
2299 
2300 		if (view->focussed && nprinted == selected_line - 1)
2301 			wstandout(view->window);
2302 
2303 		blame_line = &lines[lineno - 1];
2304 		if (blame_line->annotated && prev_id &&
2305 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2306 			waddstr(view->window, "         ");
2307 		else if (blame_line->annotated) {
2308 			char *id_str;
2309 			err = got_object_id_str(&id_str, blame_line->id);
2310 			if (err) {
2311 				free(line);
2312 				free(wline);
2313 				return err;
2314 			}
2315 			wprintw(view->window, "%.8s ", id_str);
2316 			free(id_str);
2317 			prev_id = blame_line->id;
2318 		} else {
2319 			waddstr(view->window, "........ ");
2320 			prev_id = NULL;
2321 		}
2322 
2323 		waddwstr(view->window, wline);
2324 		while (width < wlimit) {
2325 			waddch(view->window, ' ');
2326 			width++;
2327 		}
2328 		if (view->focussed && nprinted == selected_line - 1)
2329 			wstandend(view->window);
2330 		if (++nprinted == 1)
2331 			*first_displayed_line = lineno;
2332 		free(line);
2333 		free(wline);
2334 		wline = NULL;
2335 	}
2336 	*last_displayed_line = lineno;
2337 
2338 	view_vborder(view);
2339 
2340 	return NULL;
2341 }
2342 
2343 static const struct got_error *
2344 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2345 {
2346 	const struct got_error *err = NULL;
2347 	struct tog_blame_cb_args *a = arg;
2348 	struct tog_blame_line *line;
2349 	int errcode;
2350 
2351 	if (nlines != a->nlines ||
2352 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2353 		return got_error(GOT_ERR_RANGE);
2354 
2355 	errcode = pthread_mutex_lock(&tog_mutex);
2356 	if (errcode)
2357 		return got_error_set_errno(errcode);
2358 
2359 	if (*a->quit) {	/* user has quit the blame view */
2360 		err = got_error(GOT_ERR_ITER_COMPLETED);
2361 		goto done;
2362 	}
2363 
2364 	if (lineno == -1)
2365 		goto done; /* no change in this commit */
2366 
2367 	line = &a->lines[lineno - 1];
2368 	if (line->annotated)
2369 		goto done;
2370 
2371 	line->id = got_object_id_dup(id);
2372 	if (line->id == NULL) {
2373 		err = got_error_from_errno();
2374 		goto done;
2375 	}
2376 	line->annotated = 1;
2377 done:
2378 	errcode = pthread_mutex_unlock(&tog_mutex);
2379 	if (errcode)
2380 		err = got_error_set_errno(errcode);
2381 	return err;
2382 }
2383 
2384 static void *
2385 blame_thread(void *arg)
2386 {
2387 	const struct got_error *err;
2388 	struct tog_blame_thread_args *ta = arg;
2389 	struct tog_blame_cb_args *a = ta->cb_args;
2390 	int errcode;
2391 
2392 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2393 	    blame_cb, ta->cb_args);
2394 
2395 	errcode = pthread_mutex_lock(&tog_mutex);
2396 	if (errcode)
2397 		return (void *)got_error_set_errno(errcode);
2398 
2399 	got_repo_close(ta->repo);
2400 	ta->repo = NULL;
2401 	*ta->complete = 1;
2402 
2403 	errcode = pthread_mutex_unlock(&tog_mutex);
2404 	if (errcode && err == NULL)
2405 		err = got_error_set_errno(errcode);
2406 
2407 	return (void *)err;
2408 }
2409 
2410 static struct got_object_id *
2411 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2412     int selected_line)
2413 {
2414 	struct tog_blame_line *line;
2415 
2416 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2417 	if (!line->annotated)
2418 		return NULL;
2419 
2420 	return line->id;
2421 }
2422 
2423 static const struct got_error *
2424 stop_blame(struct tog_blame *blame)
2425 {
2426 	const struct got_error *err = NULL;
2427 	int i;
2428 
2429 	if (blame->thread) {
2430 		int errcode;
2431 		errcode = pthread_mutex_unlock(&tog_mutex);
2432 		if (errcode)
2433 			return got_error_set_errno(errcode);
2434 		errcode = pthread_join(blame->thread, (void **)&err);
2435 		if (errcode)
2436 			return got_error_set_errno(errcode);
2437 		errcode = pthread_mutex_lock(&tog_mutex);
2438 		if (errcode)
2439 			return got_error_set_errno(errcode);
2440 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2441 			err = NULL;
2442 		blame->thread = NULL;
2443 	}
2444 	if (blame->thread_args.repo) {
2445 		got_repo_close(blame->thread_args.repo);
2446 		blame->thread_args.repo = NULL;
2447 	}
2448 	if (blame->f) {
2449 		fclose(blame->f);
2450 		blame->f = NULL;
2451 	}
2452 	if (blame->lines) {
2453 		for (i = 0; i < blame->nlines; i++)
2454 			free(blame->lines[i].id);
2455 		free(blame->lines);
2456 		blame->lines = NULL;
2457 	}
2458 	free(blame->cb_args.commit_id);
2459 	blame->cb_args.commit_id = NULL;
2460 
2461 	return err;
2462 }
2463 
2464 static const struct got_error *
2465 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2466     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2467     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2468     struct got_repository *repo)
2469 {
2470 	const struct got_error *err = NULL;
2471 	struct got_blob_object *blob = NULL;
2472 	struct got_repository *thread_repo = NULL;
2473 	struct got_object_id *obj_id = NULL;
2474 	int obj_type;
2475 
2476 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2477 	if (err)
2478 		return err;
2479 	if (obj_id == NULL)
2480 		return got_error(GOT_ERR_NO_OBJ);
2481 
2482 	err = got_object_get_type(&obj_type, repo, obj_id);
2483 	if (err)
2484 		goto done;
2485 
2486 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2487 		err = got_error(GOT_ERR_OBJ_TYPE);
2488 		goto done;
2489 	}
2490 
2491 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2492 	if (err)
2493 		goto done;
2494 	blame->f = got_opentemp();
2495 	if (blame->f == NULL) {
2496 		err = got_error_from_errno();
2497 		goto done;
2498 	}
2499 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2500 	    blame->f, blob);
2501 	if (err)
2502 		goto done;
2503 
2504 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2505 	if (blame->lines == NULL) {
2506 		err = got_error_from_errno();
2507 		goto done;
2508 	}
2509 
2510 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2511 	if (err)
2512 		goto done;
2513 
2514 	blame->cb_args.view = view;
2515 	blame->cb_args.lines = blame->lines;
2516 	blame->cb_args.nlines = blame->nlines;
2517 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2518 	if (blame->cb_args.commit_id == NULL) {
2519 		err = got_error_from_errno();
2520 		goto done;
2521 	}
2522 	blame->cb_args.quit = done;
2523 
2524 	blame->thread_args.path = path;
2525 	blame->thread_args.repo = thread_repo;
2526 	blame->thread_args.cb_args = &blame->cb_args;
2527 	blame->thread_args.complete = blame_complete;
2528 	*blame_complete = 0;
2529 
2530 done:
2531 	if (blob)
2532 		got_object_blob_close(blob);
2533 	free(obj_id);
2534 	if (err)
2535 		stop_blame(blame);
2536 	return err;
2537 }
2538 
2539 static const struct got_error *
2540 open_blame_view(struct tog_view *view, char *path,
2541     struct got_object_id *commit_id, struct got_repository *repo)
2542 {
2543 	const struct got_error *err = NULL;
2544 	struct tog_blame_view_state *s = &view->state.blame;
2545 
2546 	SIMPLEQ_INIT(&s->blamed_commits);
2547 
2548 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2549 	if (err)
2550 		return err;
2551 
2552 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2553 	s->first_displayed_line = 1;
2554 	s->last_displayed_line = view->nlines;
2555 	s->selected_line = 1;
2556 	s->blame_complete = 0;
2557 	s->path = path;
2558 	if (s->path == NULL)
2559 		return got_error_from_errno();
2560 	s->repo = repo;
2561 	s->commit_id = commit_id;
2562 	memset(&s->blame, 0, sizeof(s->blame));
2563 
2564 	view->show = show_blame_view;
2565 	view->input = input_blame_view;
2566 	view->close = close_blame_view;
2567 
2568 	return run_blame(&s->blame, view, &s->blame_complete,
2569 	    &s->first_displayed_line, &s->last_displayed_line,
2570 	    &s->selected_line, &s->done, &s->eof, s->path,
2571 	    s->blamed_commit->id, s->repo);
2572 }
2573 
2574 static const struct got_error *
2575 close_blame_view(struct tog_view *view)
2576 {
2577 	const struct got_error *err = NULL;
2578 	struct tog_blame_view_state *s = &view->state.blame;
2579 
2580 	if (s->blame.thread)
2581 		err = stop_blame(&s->blame);
2582 
2583 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2584 		struct got_object_qid *blamed_commit;
2585 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2586 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2587 		got_object_qid_free(blamed_commit);
2588 	}
2589 
2590 	free(s->path);
2591 
2592 	return err;
2593 }
2594 
2595 static const struct got_error *
2596 show_blame_view(struct tog_view *view)
2597 {
2598 	const struct got_error *err = NULL;
2599 	struct tog_blame_view_state *s = &view->state.blame;
2600 	int errcode;
2601 
2602 	if (s->blame.thread == NULL) {
2603 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2604 		    &s->blame.thread_args);
2605 		if (errcode)
2606 			return got_error_set_errno(errcode);
2607 	}
2608 
2609 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2610 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2611 	    s->selected_line, &s->first_displayed_line,
2612 	    &s->last_displayed_line, &s->eof, view->nlines);
2613 
2614 	view_vborder(view);
2615 	return err;
2616 }
2617 
2618 static const struct got_error *
2619 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2620     struct tog_view **focus_view, struct tog_view *view, int ch)
2621 {
2622 	const struct got_error *err = NULL, *thread_err = NULL;
2623 	struct tog_view *diff_view;
2624 	struct tog_blame_view_state *s = &view->state.blame;
2625 	int begin_x = 0;
2626 
2627 	switch (ch) {
2628 		case 'q':
2629 			s->done = 1;
2630 			break;
2631 		case 'k':
2632 		case KEY_UP:
2633 			if (s->selected_line > 1)
2634 				s->selected_line--;
2635 			else if (s->selected_line == 1 &&
2636 			    s->first_displayed_line > 1)
2637 				s->first_displayed_line--;
2638 			break;
2639 		case KEY_PPAGE:
2640 			if (s->first_displayed_line == 1) {
2641 				s->selected_line = 1;
2642 				break;
2643 			}
2644 			if (s->first_displayed_line > view->nlines - 2)
2645 				s->first_displayed_line -=
2646 				    (view->nlines - 2);
2647 			else
2648 				s->first_displayed_line = 1;
2649 			break;
2650 		case 'j':
2651 		case KEY_DOWN:
2652 			if (s->selected_line < view->nlines - 2 &&
2653 			    s->first_displayed_line +
2654 			    s->selected_line <= s->blame.nlines)
2655 				s->selected_line++;
2656 			else if (s->last_displayed_line <
2657 			    s->blame.nlines)
2658 				s->first_displayed_line++;
2659 			break;
2660 		case 'b':
2661 		case 'p': {
2662 			struct got_object_id *id = NULL;
2663 			id = get_selected_commit_id(s->blame.lines,
2664 			    s->first_displayed_line, s->selected_line);
2665 			if (id == NULL)
2666 				break;
2667 			if (ch == 'p') {
2668 				struct got_commit_object *commit;
2669 				struct got_object_qid *pid;
2670 				struct got_object_id *blob_id = NULL;
2671 				int obj_type;
2672 				err = got_object_open_as_commit(&commit,
2673 				    s->repo, id);
2674 				if (err)
2675 					break;
2676 				pid = SIMPLEQ_FIRST(
2677 				    got_object_commit_get_parent_ids(commit));
2678 				if (pid == NULL) {
2679 					got_object_commit_close(commit);
2680 					break;
2681 				}
2682 				/* Check if path history ends here. */
2683 				err = got_object_id_by_path(&blob_id, s->repo,
2684 				    pid->id, s->path);
2685 				if (err) {
2686 					if (err->code == GOT_ERR_NO_TREE_ENTRY)
2687 						err = NULL;
2688 					got_object_commit_close(commit);
2689 					break;
2690 				}
2691 				err = got_object_get_type(&obj_type, s->repo,
2692 				    blob_id);
2693 				free(blob_id);
2694 				/* Can't blame non-blob type objects. */
2695 				if (obj_type != GOT_OBJ_TYPE_BLOB) {
2696 					got_object_commit_close(commit);
2697 					break;
2698 				}
2699 				err = got_object_qid_alloc(&s->blamed_commit,
2700 				    pid->id);
2701 				got_object_commit_close(commit);
2702 			} else {
2703 				if (got_object_id_cmp(id,
2704 				    s->blamed_commit->id) == 0)
2705 					break;
2706 				err = got_object_qid_alloc(&s->blamed_commit,
2707 				    id);
2708 			}
2709 			if (err)
2710 				break;
2711 			s->done = 1;
2712 			thread_err = stop_blame(&s->blame);
2713 			s->done = 0;
2714 			if (thread_err)
2715 				break;
2716 			SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
2717 			    s->blamed_commit, entry);
2718 			err = run_blame(&s->blame, view, &s->blame_complete,
2719 			    &s->first_displayed_line, &s->last_displayed_line,
2720 			    &s->selected_line, &s->done, &s->eof,
2721 			    s->path, s->blamed_commit->id, s->repo);
2722 			if (err)
2723 				break;
2724 			break;
2725 		}
2726 		case 'B': {
2727 			struct got_object_qid *first;
2728 			first = SIMPLEQ_FIRST(&s->blamed_commits);
2729 			if (!got_object_id_cmp(first->id, s->commit_id))
2730 				break;
2731 			s->done = 1;
2732 			thread_err = stop_blame(&s->blame);
2733 			s->done = 0;
2734 			if (thread_err)
2735 				break;
2736 			SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2737 			got_object_qid_free(s->blamed_commit);
2738 			s->blamed_commit =
2739 			    SIMPLEQ_FIRST(&s->blamed_commits);
2740 			err = run_blame(&s->blame, view, &s->blame_complete,
2741 			    &s->first_displayed_line, &s->last_displayed_line,
2742 			    &s->selected_line, &s->done, &s->eof, s->path,
2743 			    s->blamed_commit->id, s->repo);
2744 			if (err)
2745 				break;
2746 			break;
2747 		}
2748 		case KEY_ENTER:
2749 		case '\r': {
2750 			struct got_object_id *id = NULL;
2751 			struct got_object_qid *pid;
2752 			struct got_commit_object *commit = NULL;
2753 			id = get_selected_commit_id(s->blame.lines,
2754 			    s->first_displayed_line, s->selected_line);
2755 			if (id == NULL)
2756 				break;
2757 			err = got_object_open_as_commit(&commit, s->repo, id);
2758 			if (err)
2759 				break;
2760 			pid = SIMPLEQ_FIRST(
2761 			    got_object_commit_get_parent_ids(commit));
2762 			if (view_is_parent_view(view))
2763 			    begin_x = view_split_begin_x(view->begin_x);
2764 			diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
2765 			if (diff_view == NULL) {
2766 				got_object_commit_close(commit);
2767 				err = got_error_from_errno();
2768 				break;
2769 			}
2770 			err = open_diff_view(diff_view, pid ? pid->id : NULL,
2771 			    id, s->repo);
2772 			got_object_commit_close(commit);
2773 			if (err) {
2774 				view_close(diff_view);
2775 				break;
2776 			}
2777 			if (view_is_parent_view(view)) {
2778 				err = view_close_child(view);
2779 				if (err)
2780 					break;
2781 				err = view_set_child(view, diff_view);
2782 				if (err) {
2783 					view_close(diff_view);
2784 					break;
2785 				}
2786 				*focus_view = diff_view;
2787 				view->child_focussed = 1;
2788 			} else
2789 				*new_view = diff_view;
2790 			if (err)
2791 				break;
2792 			break;
2793 		}
2794 		case KEY_NPAGE:
2795 		case ' ':
2796 			if (s->last_displayed_line >= s->blame.nlines &&
2797 			    s->selected_line < view->nlines - 2) {
2798 				s->selected_line = MIN(s->blame.nlines,
2799 				    view->nlines - 2);
2800 				break;
2801 			}
2802 			if (s->last_displayed_line + view->nlines - 2
2803 			    <= s->blame.nlines)
2804 				s->first_displayed_line +=
2805 				    view->nlines - 2;
2806 			else
2807 				s->first_displayed_line =
2808 				    s->blame.nlines -
2809 				    (view->nlines - 3);
2810 			break;
2811 		case KEY_RESIZE:
2812 			if (s->selected_line > view->nlines - 2) {
2813 				s->selected_line = MIN(s->blame.nlines,
2814 				    view->nlines - 2);
2815 			}
2816 			break;
2817 		default:
2818 			break;
2819 	}
2820 	return thread_err ? thread_err : err;
2821 }
2822 
2823 static const struct got_error *
2824 cmd_blame(int argc, char *argv[])
2825 {
2826 	const struct got_error *error;
2827 	struct got_repository *repo = NULL;
2828 	struct got_worktree *worktree = NULL;
2829 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
2830 	struct got_object_id *commit_id = NULL;
2831 	char *commit_id_str = NULL;
2832 	int ch;
2833 	struct tog_view *view;
2834 
2835 #ifndef PROFILE
2836 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2837 	    NULL) == -1)
2838 		err(1, "pledge");
2839 #endif
2840 
2841 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
2842 		switch (ch) {
2843 		case 'c':
2844 			commit_id_str = optarg;
2845 			break;
2846 		case 'r':
2847 			repo_path = realpath(optarg, NULL);
2848 			if (repo_path == NULL)
2849 				err(1, "-r option");
2850 			break;
2851 		default:
2852 			usage();
2853 			/* NOTREACHED */
2854 		}
2855 	}
2856 
2857 	argc -= optind;
2858 	argv += optind;
2859 
2860 	if (argc == 1)
2861 		path = argv[0];
2862 	else
2863 		usage_blame();
2864 
2865 	cwd = getcwd(NULL, 0);
2866 	if (cwd == NULL) {
2867 		error = got_error_from_errno();
2868 		goto done;
2869 	}
2870 	if (repo_path == NULL) {
2871 		error = got_worktree_open(&worktree, cwd);
2872 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
2873 			goto done;
2874 		else
2875 			error = NULL;
2876 		if (worktree) {
2877 			repo_path =
2878 			    strdup(got_worktree_get_repo_path(worktree));
2879 			if (repo_path == NULL)
2880 				error = got_error_from_errno();
2881 			if (error)
2882 				goto done;
2883 		} else {
2884 			repo_path = strdup(cwd);
2885 			if (repo_path == NULL) {
2886 				error = got_error_from_errno();
2887 				goto done;
2888 			}
2889 		}
2890 	}
2891 
2892 	init_curses();
2893 
2894 	error = apply_unveil(repo_path, NULL);
2895 	if (error)
2896 		goto done;
2897 
2898 	error = got_repo_open(&repo, repo_path);
2899 	if (error != NULL)
2900 		goto done;
2901 
2902 	if (worktree) {
2903 		const char *prefix = got_worktree_get_path_prefix(worktree);
2904 		char *p, *worktree_subdir = cwd +
2905 		    strlen(got_worktree_get_root_path(worktree));
2906 		if (asprintf(&p, "%s%s%s%s%s",
2907 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
2908 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
2909 		    path) == -1) {
2910 			error = got_error_from_errno();
2911 			goto done;
2912 		}
2913 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
2914 		free(p);
2915 	} else {
2916 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
2917 	}
2918 	if (error)
2919 		goto done;
2920 
2921 	if (commit_id_str == NULL) {
2922 		struct got_reference *head_ref;
2923 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
2924 		if (error != NULL)
2925 			goto done;
2926 		error = got_ref_resolve(&commit_id, repo, head_ref);
2927 		got_ref_close(head_ref);
2928 	} else {
2929 		error = got_object_resolve_id_str(&commit_id, repo,
2930 		    commit_id_str);
2931 	}
2932 	if (error != NULL)
2933 		goto done;
2934 
2935 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
2936 	if (view == NULL) {
2937 		error = got_error_from_errno();
2938 		goto done;
2939 	}
2940 	error = open_blame_view(view, in_repo_path, commit_id, repo);
2941 	if (error)
2942 		goto done;
2943 	error = view_loop(view);
2944 done:
2945 	free(repo_path);
2946 	free(cwd);
2947 	free(commit_id);
2948 	if (worktree)
2949 		got_worktree_close(worktree);
2950 	if (repo)
2951 		got_repo_close(repo);
2952 	return error;
2953 }
2954 
2955 static const struct got_error *
2956 draw_tree_entries(struct tog_view *view,
2957     struct got_tree_entry **first_displayed_entry,
2958     struct got_tree_entry **last_displayed_entry,
2959     struct got_tree_entry **selected_entry, int *ndisplayed,
2960     const char *label, int show_ids, const char *parent_path,
2961     const struct got_tree_entries *entries, int selected, int limit, int isroot)
2962 {
2963 	const struct got_error *err = NULL;
2964 	struct got_tree_entry *te;
2965 	wchar_t *wline;
2966 	int width, n;
2967 
2968 	*ndisplayed = 0;
2969 
2970 	werase(view->window);
2971 
2972 	if (limit == 0)
2973 		return NULL;
2974 
2975 	err = format_line(&wline, &width, label, view->ncols);
2976 	if (err)
2977 		return err;
2978 	if (view_needs_focus_indication(view))
2979 		wstandout(view->window);
2980 	waddwstr(view->window, wline);
2981 	if (view_needs_focus_indication(view))
2982 		wstandend(view->window);
2983 	free(wline);
2984 	wline = NULL;
2985 	if (width < view->ncols)
2986 		waddch(view->window, '\n');
2987 	if (--limit <= 0)
2988 		return NULL;
2989 	err = format_line(&wline, &width, parent_path, view->ncols);
2990 	if (err)
2991 		return err;
2992 	waddwstr(view->window, wline);
2993 	free(wline);
2994 	wline = NULL;
2995 	if (width < view->ncols)
2996 		waddch(view->window, '\n');
2997 	if (--limit <= 0)
2998 		return NULL;
2999 	waddch(view->window, '\n');
3000 	if (--limit <= 0)
3001 		return NULL;
3002 
3003 	te = SIMPLEQ_FIRST(&entries->head);
3004 	if (*first_displayed_entry == NULL) {
3005 		if (selected == 0) {
3006 			if (view->focussed)
3007 				wstandout(view->window);
3008 			*selected_entry = NULL;
3009 		}
3010 		waddstr(view->window, "  ..\n");	/* parent directory */
3011 		if (selected == 0 && view->focussed)
3012 			wstandend(view->window);
3013 		(*ndisplayed)++;
3014 		if (--limit <= 0)
3015 			return NULL;
3016 		n = 1;
3017 	} else {
3018 		n = 0;
3019 		while (te != *first_displayed_entry)
3020 			te = SIMPLEQ_NEXT(te, entry);
3021 	}
3022 
3023 	while (te) {
3024 		char *line = NULL, *id_str = NULL;
3025 
3026 		if (show_ids) {
3027 			err = got_object_id_str(&id_str, te->id);
3028 			if (err)
3029 				return got_error_from_errno();
3030 		}
3031 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3032 		    te->name, S_ISDIR(te->mode) ? "/" : "") == -1) {
3033 			free(id_str);
3034 			return got_error_from_errno();
3035 		}
3036 		free(id_str);
3037 		err = format_line(&wline, &width, line, view->ncols);
3038 		if (err) {
3039 			free(line);
3040 			break;
3041 		}
3042 		if (n == selected) {
3043 			if (view->focussed)
3044 				wstandout(view->window);
3045 			*selected_entry = te;
3046 		}
3047 		waddwstr(view->window, wline);
3048 		if (width < view->ncols)
3049 			waddch(view->window, '\n');
3050 		if (n == selected && view->focussed)
3051 			wstandend(view->window);
3052 		free(line);
3053 		free(wline);
3054 		wline = NULL;
3055 		n++;
3056 		(*ndisplayed)++;
3057 		*last_displayed_entry = te;
3058 		if (--limit <= 0)
3059 			break;
3060 		te = SIMPLEQ_NEXT(te, entry);
3061 	}
3062 
3063 	return err;
3064 }
3065 
3066 static void
3067 tree_scroll_up(struct got_tree_entry **first_displayed_entry, int maxscroll,
3068     const struct got_tree_entries *entries, int isroot)
3069 {
3070 	struct got_tree_entry *te, *prev;
3071 	int i;
3072 
3073 	if (*first_displayed_entry == NULL)
3074 		return;
3075 
3076 	te = SIMPLEQ_FIRST(&entries->head);
3077 	if (*first_displayed_entry == te) {
3078 		if (!isroot)
3079 			*first_displayed_entry = NULL;
3080 		return;
3081 	}
3082 
3083 	/* XXX this is stupid... switch to TAILQ? */
3084 	for (i = 0; i < maxscroll; i++) {
3085 		while (te != *first_displayed_entry) {
3086 			prev = te;
3087 			te = SIMPLEQ_NEXT(te, entry);
3088 		}
3089 		*first_displayed_entry = prev;
3090 		te = SIMPLEQ_FIRST(&entries->head);
3091 	}
3092 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3093 		*first_displayed_entry = NULL;
3094 }
3095 
3096 static int
3097 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3098 	struct got_tree_entry *last_displayed_entry,
3099 	const struct got_tree_entries *entries)
3100 {
3101 	struct got_tree_entry *next, *last;
3102 	int n = 0;
3103 
3104 	if (*first_displayed_entry)
3105 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3106 	else
3107 		next = SIMPLEQ_FIRST(&entries->head);
3108 	last = last_displayed_entry;
3109 	while (next && last && n++ < maxscroll) {
3110 		last = SIMPLEQ_NEXT(last, entry);
3111 		if (last) {
3112 			*first_displayed_entry = next;
3113 			next = SIMPLEQ_NEXT(next, entry);
3114 		}
3115 	}
3116 	return n;
3117 }
3118 
3119 static const struct got_error *
3120 tree_entry_path(char **path, struct tog_parent_trees *parents,
3121     struct got_tree_entry *te)
3122 {
3123 	const struct got_error *err = NULL;
3124 	struct tog_parent_tree *pt;
3125 	size_t len = 2; /* for leading slash and NUL */
3126 
3127 	TAILQ_FOREACH(pt, parents, entry)
3128 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3129 	if (te)
3130 		len += strlen(te->name);
3131 
3132 	*path = calloc(1, len);
3133 	if (path == NULL)
3134 		return got_error_from_errno();
3135 
3136 	(*path)[0] = '/';
3137 	pt = TAILQ_LAST(parents, tog_parent_trees);
3138 	while (pt) {
3139 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3140 			err = got_error(GOT_ERR_NO_SPACE);
3141 			goto done;
3142 		}
3143 		if (strlcat(*path, "/", len) >= len) {
3144 			err = got_error(GOT_ERR_NO_SPACE);
3145 			goto done;
3146 		}
3147 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3148 	}
3149 	if (te) {
3150 		if (strlcat(*path, te->name, len) >= len) {
3151 			err = got_error(GOT_ERR_NO_SPACE);
3152 			goto done;
3153 		}
3154 	}
3155 done:
3156 	if (err) {
3157 		free(*path);
3158 		*path = NULL;
3159 	}
3160 	return err;
3161 }
3162 
3163 static const struct got_error *
3164 blame_tree_entry(struct tog_view **new_view, int begin_x,
3165     struct got_tree_entry *te, struct tog_parent_trees *parents,
3166     struct got_object_id *commit_id, struct got_repository *repo)
3167 {
3168 	const struct got_error *err = NULL;
3169 	char *path;
3170 	struct tog_view *blame_view;
3171 
3172 	err = tree_entry_path(&path, parents, te);
3173 	if (err)
3174 		return err;
3175 
3176 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3177 	if (blame_view == NULL)
3178 		return got_error_from_errno();
3179 
3180 	err = open_blame_view(blame_view, path, commit_id, repo);
3181 	if (err) {
3182 		view_close(blame_view);
3183 		free(path);
3184 	} else
3185 		*new_view = blame_view;
3186 	return err;
3187 }
3188 
3189 static const struct got_error *
3190 log_tree_entry(struct tog_view **new_view, int begin_x,
3191     struct got_tree_entry *te, struct tog_parent_trees *parents,
3192     struct got_object_id *commit_id, struct got_repository *repo)
3193 {
3194 	struct tog_view *log_view;
3195 	const struct got_error *err = NULL;
3196 	char *path;
3197 
3198 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3199 	if (log_view == NULL)
3200 		return got_error_from_errno();
3201 
3202 	err = tree_entry_path(&path, parents, te);
3203 	if (err)
3204 		return err;
3205 
3206 	err = open_log_view(log_view, commit_id, repo, path, 0);
3207 	if (err)
3208 		view_close(log_view);
3209 	else
3210 		*new_view = log_view;
3211 	free(path);
3212 	return err;
3213 }
3214 
3215 static const struct got_error *
3216 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3217     struct got_object_id *commit_id, struct got_repository *repo)
3218 {
3219 	const struct got_error *err = NULL;
3220 	char *commit_id_str = NULL;
3221 	struct tog_tree_view_state *s = &view->state.tree;
3222 
3223 	TAILQ_INIT(&s->parents);
3224 
3225 	err = got_object_id_str(&commit_id_str, commit_id);
3226 	if (err != NULL)
3227 		goto done;
3228 
3229 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3230 		err = got_error_from_errno();
3231 		goto done;
3232 	}
3233 
3234 	s->root = s->tree = root;
3235 	s->entries = got_object_tree_get_entries(root);
3236 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3237 	s->commit_id = got_object_id_dup(commit_id);
3238 	if (s->commit_id == NULL) {
3239 		err = got_error_from_errno();
3240 		goto done;
3241 	}
3242 	s->repo = repo;
3243 
3244 	view->show = show_tree_view;
3245 	view->input = input_tree_view;
3246 	view->close = close_tree_view;
3247 done:
3248 	free(commit_id_str);
3249 	if (err) {
3250 		free(s->tree_label);
3251 		s->tree_label = NULL;
3252 	}
3253 	return err;
3254 }
3255 
3256 static const struct got_error *
3257 close_tree_view(struct tog_view *view)
3258 {
3259 	struct tog_tree_view_state *s = &view->state.tree;
3260 
3261 	free(s->tree_label);
3262 	s->tree_label = NULL;
3263 	free(s->commit_id);
3264 	s->commit_id = NULL;
3265 	while (!TAILQ_EMPTY(&s->parents)) {
3266 		struct tog_parent_tree *parent;
3267 		parent = TAILQ_FIRST(&s->parents);
3268 		TAILQ_REMOVE(&s->parents, parent, entry);
3269 		free(parent);
3270 
3271 	}
3272 	if (s->tree != s->root)
3273 		got_object_tree_close(s->tree);
3274 	got_object_tree_close(s->root);
3275 
3276 	return NULL;
3277 }
3278 
3279 static const struct got_error *
3280 show_tree_view(struct tog_view *view)
3281 {
3282 	const struct got_error *err = NULL;
3283 	struct tog_tree_view_state *s = &view->state.tree;
3284 	char *parent_path;
3285 
3286 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3287 	if (err)
3288 		return err;
3289 
3290 	err = draw_tree_entries(view, &s->first_displayed_entry,
3291 	    &s->last_displayed_entry, &s->selected_entry,
3292 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3293 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3294 	free(parent_path);
3295 
3296 	view_vborder(view);
3297 	return err;
3298 }
3299 
3300 static const struct got_error *
3301 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3302     struct tog_view **focus_view, struct tog_view *view, int ch)
3303 {
3304 	const struct got_error *err = NULL;
3305 	struct tog_tree_view_state *s = &view->state.tree;
3306 	struct tog_view *log_view;
3307 	int begin_x = 0, nscrolled;
3308 
3309 	switch (ch) {
3310 		case 'i':
3311 			s->show_ids = !s->show_ids;
3312 			break;
3313 		case 'l':
3314 			if (!s->selected_entry)
3315 				break;
3316 			if (view_is_parent_view(view))
3317 				begin_x = view_split_begin_x(view->begin_x);
3318 			err = log_tree_entry(&log_view, begin_x,
3319 			    s->selected_entry, &s->parents,
3320 			    s->commit_id, s->repo);
3321 			if (view_is_parent_view(view)) {
3322 				err = view_close_child(view);
3323 				if (err)
3324 					return err;
3325 				err = view_set_child(view, log_view);
3326 				if (err) {
3327 					view_close(log_view);
3328 					break;
3329 				}
3330 				*focus_view = log_view;
3331 				view->child_focussed = 1;
3332 			} else
3333 				*new_view = log_view;
3334 			break;
3335 		case 'k':
3336 		case KEY_UP:
3337 			if (s->selected > 0) {
3338 				s->selected--;
3339 				if (s->selected == 0)
3340 					break;
3341 			}
3342 			if (s->selected > 0)
3343 				break;
3344 			tree_scroll_up(&s->first_displayed_entry, 1,
3345 			    s->entries, s->tree == s->root);
3346 			break;
3347 		case KEY_PPAGE:
3348 			tree_scroll_up(&s->first_displayed_entry,
3349 			    MAX(0, view->nlines - 4 - s->selected), s->entries,
3350 			    s->tree == s->root);
3351 			s->selected = 0;
3352 			if (SIMPLEQ_FIRST(&s->entries->head) ==
3353 			    s->first_displayed_entry && s->tree != s->root)
3354 				s->first_displayed_entry = NULL;
3355 			break;
3356 		case 'j':
3357 		case KEY_DOWN:
3358 			if (s->selected < s->ndisplayed - 1) {
3359 				s->selected++;
3360 				break;
3361 			}
3362 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3363 			    == NULL) {
3364 				/* can't scroll any further */
3365 				break;
3366 			}
3367 			tree_scroll_down(&s->first_displayed_entry, 1,
3368 			    s->last_displayed_entry, s->entries);
3369 			break;
3370 		case KEY_NPAGE:
3371 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3372 			    == NULL) {
3373 				/* can't scroll any further; move cursor down */
3374 				if (s->selected < s->ndisplayed - 1)
3375 					s->selected = s->ndisplayed - 1;
3376 				break;
3377 			}
3378 			nscrolled = tree_scroll_down(&s->first_displayed_entry,
3379 			    view->nlines, s->last_displayed_entry, s->entries);
3380 			if (nscrolled < view->nlines) {
3381 				int ndisplayed = 0;
3382 				struct got_tree_entry *te;
3383 				te = s->first_displayed_entry;
3384 				do {
3385 					ndisplayed++;
3386 					te = SIMPLEQ_NEXT(te, entry);
3387 				} while (te);
3388 				s->selected = ndisplayed - 1;
3389 			}
3390 			break;
3391 		case KEY_ENTER:
3392 		case '\r':
3393 			if (s->selected_entry == NULL) {
3394 				struct tog_parent_tree *parent;
3395 		case KEY_BACKSPACE:
3396 				/* user selected '..' */
3397 				if (s->tree == s->root)
3398 					break;
3399 				parent = TAILQ_FIRST(&s->parents);
3400 				TAILQ_REMOVE(&s->parents, parent,
3401 				    entry);
3402 				got_object_tree_close(s->tree);
3403 				s->tree = parent->tree;
3404 				s->entries =
3405 				    got_object_tree_get_entries(s->tree);
3406 				s->first_displayed_entry =
3407 				    parent->first_displayed_entry;
3408 				s->selected_entry =
3409 				    parent->selected_entry;
3410 				s->selected = parent->selected;
3411 				free(parent);
3412 			} else if (S_ISDIR(s->selected_entry->mode)) {
3413 				struct tog_parent_tree *parent;
3414 				struct got_tree_object *child;
3415 				err = got_object_open_as_tree(&child,
3416 				    s->repo, s->selected_entry->id);
3417 				if (err)
3418 					break;
3419 				parent = calloc(1, sizeof(*parent));
3420 				if (parent == NULL) {
3421 					err = got_error_from_errno();
3422 					break;
3423 				}
3424 				parent->tree = s->tree;
3425 				parent->first_displayed_entry =
3426 				   s->first_displayed_entry;
3427 				parent->selected_entry = s->selected_entry;
3428 				parent->selected = s->selected;
3429 				TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3430 				s->tree = child;
3431 				s->entries =
3432 				    got_object_tree_get_entries(s->tree);
3433 				s->selected = 0;
3434 				s->first_displayed_entry = NULL;
3435 			} else if (S_ISREG(s->selected_entry->mode)) {
3436 				struct tog_view *blame_view;
3437 				int begin_x = view_is_parent_view(view) ?
3438 				    view_split_begin_x(view->begin_x) : 0;
3439 
3440 				err = blame_tree_entry(&blame_view, begin_x,
3441 				    s->selected_entry, &s->parents, s->commit_id,
3442 				    s->repo);
3443 				if (err)
3444 					break;
3445 				if (view_is_parent_view(view)) {
3446 					err = view_close_child(view);
3447 					if (err)
3448 						return err;
3449 					err = view_set_child(view, blame_view);
3450 					if (err) {
3451 						view_close(blame_view);
3452 						break;
3453 					}
3454 					*focus_view = blame_view;
3455 					view->child_focussed = 1;
3456 				} else
3457 					*new_view = blame_view;
3458 			}
3459 			break;
3460 		case KEY_RESIZE:
3461 			if (s->selected > view->nlines)
3462 				s->selected = s->ndisplayed - 1;
3463 			break;
3464 		default:
3465 			break;
3466 	}
3467 
3468 	return err;
3469 }
3470 
3471 __dead static void
3472 usage_tree(void)
3473 {
3474 	endwin();
3475 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3476 	    getprogname());
3477 	exit(1);
3478 }
3479 
3480 static const struct got_error *
3481 cmd_tree(int argc, char *argv[])
3482 {
3483 	const struct got_error *error;
3484 	struct got_repository *repo = NULL;
3485 	char *repo_path = NULL;
3486 	struct got_object_id *commit_id = NULL;
3487 	char *commit_id_arg = NULL;
3488 	struct got_commit_object *commit = NULL;
3489 	struct got_tree_object *tree = NULL;
3490 	int ch;
3491 	struct tog_view *view;
3492 
3493 #ifndef PROFILE
3494 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3495 	    NULL) == -1)
3496 		err(1, "pledge");
3497 #endif
3498 
3499 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3500 		switch (ch) {
3501 		case 'c':
3502 			commit_id_arg = optarg;
3503 			break;
3504 		default:
3505 			usage();
3506 			/* NOTREACHED */
3507 		}
3508 	}
3509 
3510 	argc -= optind;
3511 	argv += optind;
3512 
3513 	if (argc == 0) {
3514 		struct got_worktree *worktree;
3515 		char *cwd = getcwd(NULL, 0);
3516 		if (cwd == NULL)
3517 			return got_error_from_errno();
3518 		error = got_worktree_open(&worktree, cwd);
3519 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3520 			goto done;
3521 		if (worktree) {
3522 			free(cwd);
3523 			repo_path =
3524 			    strdup(got_worktree_get_repo_path(worktree));
3525 			got_worktree_close(worktree);
3526 		} else
3527 			repo_path = cwd;
3528 		if (repo_path == NULL) {
3529 			error = got_error_from_errno();
3530 			goto done;
3531 		}
3532 	} else if (argc == 1) {
3533 		repo_path = realpath(argv[0], NULL);
3534 		if (repo_path == NULL)
3535 			return got_error_from_errno();
3536 	} else
3537 		usage_log();
3538 
3539 	init_curses();
3540 
3541 	error = apply_unveil(repo_path, NULL);
3542 	if (error)
3543 		goto done;
3544 
3545 	error = got_repo_open(&repo, repo_path);
3546 	if (error != NULL)
3547 		goto done;
3548 
3549 	if (commit_id_arg == NULL)
3550 		error = get_head_commit_id(&commit_id, repo);
3551 	else
3552 		error = got_object_resolve_id_str(&commit_id, repo,
3553 		    commit_id_arg);
3554 	if (error != NULL)
3555 		goto done;
3556 
3557 	error = got_object_open_as_commit(&commit, repo, commit_id);
3558 	if (error != NULL)
3559 		goto done;
3560 
3561 	error = got_object_open_as_tree(&tree, repo,
3562 	    got_object_commit_get_tree_id(commit));
3563 	if (error != NULL)
3564 		goto done;
3565 
3566 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3567 	if (view == NULL) {
3568 		error = got_error_from_errno();
3569 		goto done;
3570 	}
3571 	error = open_tree_view(view, tree, commit_id, repo);
3572 	if (error)
3573 		goto done;
3574 	error = view_loop(view);
3575 done:
3576 	free(repo_path);
3577 	free(commit_id);
3578 	if (commit)
3579 		got_object_commit_close(commit);
3580 	if (tree)
3581 		got_object_tree_close(tree);
3582 	if (repo)
3583 		got_repo_close(repo);
3584 	return error;
3585 }
3586 
3587 __dead static void
3588 usage(void)
3589 {
3590 	int i;
3591 
3592 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3593 	    "Available commands:\n", getprogname());
3594 	for (i = 0; i < nitems(tog_commands); i++) {
3595 		struct tog_cmd *cmd = &tog_commands[i];
3596 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3597 	}
3598 	exit(1);
3599 }
3600 
3601 static char **
3602 make_argv(const char *arg0, const char *arg1)
3603 {
3604 	char **argv;
3605 	int argc = (arg1 == NULL ? 1 : 2);
3606 
3607 	argv = calloc(argc, sizeof(char *));
3608 	if (argv == NULL)
3609 		err(1, "calloc");
3610 	argv[0] = strdup(arg0);
3611 	if (argv[0] == NULL)
3612 		err(1, "calloc");
3613 	if (arg1) {
3614 		argv[1] = strdup(arg1);
3615 		if (argv[1] == NULL)
3616 			err(1, "calloc");
3617 	}
3618 
3619 	return argv;
3620 }
3621 
3622 int
3623 main(int argc, char *argv[])
3624 {
3625 	const struct got_error *error = NULL;
3626 	struct tog_cmd *cmd = NULL;
3627 	int ch, hflag = 0;
3628 	char **cmd_argv = NULL;
3629 
3630 	setlocale(LC_CTYPE, "");
3631 
3632 	while ((ch = getopt(argc, argv, "h")) != -1) {
3633 		switch (ch) {
3634 		case 'h':
3635 			hflag = 1;
3636 			break;
3637 		default:
3638 			usage();
3639 			/* NOTREACHED */
3640 		}
3641 	}
3642 
3643 	argc -= optind;
3644 	argv += optind;
3645 	optind = 0;
3646 	optreset = 1;
3647 
3648 	if (argc == 0) {
3649 		if (hflag)
3650 			usage();
3651 		/* Build an argument vector which runs a default command. */
3652 		cmd = &tog_commands[0];
3653 		cmd_argv = make_argv(cmd->name, NULL);
3654 		argc = 1;
3655 	} else {
3656 		int i;
3657 
3658 		/* Did the user specific a command? */
3659 		for (i = 0; i < nitems(tog_commands); i++) {
3660 			if (strncmp(tog_commands[i].name, argv[0],
3661 			    strlen(argv[0])) == 0) {
3662 				cmd = &tog_commands[i];
3663 				if (hflag)
3664 					tog_commands[i].cmd_usage();
3665 				break;
3666 			}
3667 		}
3668 		if (cmd == NULL) {
3669 			/* Did the user specify a repository? */
3670 			char *repo_path = realpath(argv[0], NULL);
3671 			if (repo_path) {
3672 				struct got_repository *repo;
3673 				error = got_repo_open(&repo, repo_path);
3674 				if (error == NULL)
3675 					got_repo_close(repo);
3676 			} else
3677 				error = got_error_from_errno();
3678 			if (error) {
3679 				if (hflag) {
3680 					fprintf(stderr, "%s: '%s' is not a "
3681 					    "known command\n", getprogname(),
3682 					    argv[0]);
3683 					usage();
3684 				}
3685 				fprintf(stderr, "%s: '%s' is neither a known "
3686 				    "command nor a path to a repository\n",
3687 				    getprogname(), argv[0]);
3688 				free(repo_path);
3689 				return 1;
3690 			}
3691 			cmd = &tog_commands[0];
3692 			cmd_argv = make_argv(cmd->name, repo_path);
3693 			argc = 2;
3694 			free(repo_path);
3695 		}
3696 	}
3697 
3698 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
3699 	if (error)
3700 		goto done;
3701 done:
3702 	endwin();
3703 	free(cmd_argv);
3704 	if (error)
3705 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
3706 	return 0;
3707 }