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