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