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