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, const char *branch_name,
1110     struct got_repository *repo)
1111 {
1112 	const struct got_error *err = NULL;
1113 	struct got_reference *head_ref;
1114 
1115 	*head_id = NULL;
1116 
1117 	err = got_ref_open(&head_ref, repo, branch_name, 0);
1118 	if (err)
1119 		return err;
1120 
1121 	err = got_ref_resolve(head_id, repo, head_ref);
1122 	got_ref_close(head_ref);
1123 	if (err) {
1124 		*head_id = NULL;
1125 		return err;
1126 	}
1127 
1128 	return NULL;
1129 }
1130 
1131 static const struct got_error *
1132 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1133     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1134     struct commit_queue *commits, int selected_idx, int limit,
1135     struct got_reflist_head *refs, const char *path, int commits_needed)
1136 {
1137 	const struct got_error *err = NULL;
1138 	struct commit_queue_entry *entry;
1139 	int ncommits, width;
1140 	int author_cols = 10;
1141 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1142 	char *refs_str = NULL;
1143 	wchar_t *wline;
1144 
1145 	entry = first;
1146 	ncommits = 0;
1147 	while (entry) {
1148 		if (ncommits == selected_idx) {
1149 			*selected = entry;
1150 			break;
1151 		}
1152 		entry = TAILQ_NEXT(entry, entry);
1153 		ncommits++;
1154 	}
1155 
1156 	if (*selected) {
1157 		err = got_object_id_str(&id_str, (*selected)->id);
1158 		if (err)
1159 			return err;
1160 		if (refs) {
1161 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1162 			if (err)
1163 				goto done;
1164 		}
1165 	}
1166 
1167 	if (commits_needed == 0)
1168 		halfdelay(10); /* disable fast refresh */
1169 
1170 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1171 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1172 	    commits_needed > 0 ? "loading... " :
1173 	    (refs_str ? refs_str : "")) == -1) {
1174 		err = got_error_from_errno("asprintf");
1175 		goto done;
1176 	}
1177 
1178 	if (path && strcmp(path, "/") != 0) {
1179 		if (asprintf(&header, "commit %s %s%s",
1180 		    id_str ? id_str : "........................................",
1181 		    path, ncommits_str) == -1) {
1182 			err = got_error_from_errno("asprintf");
1183 			header = NULL;
1184 			goto done;
1185 		}
1186 	} else if (asprintf(&header, "commit %s%s",
1187 	    id_str ? id_str : "........................................",
1188 	    ncommits_str) == -1) {
1189 		err = got_error_from_errno("asprintf");
1190 		header = NULL;
1191 		goto done;
1192 	}
1193 	err = format_line(&wline, &width, header, view->ncols);
1194 	if (err)
1195 		goto done;
1196 
1197 	werase(view->window);
1198 
1199 	if (view_needs_focus_indication(view))
1200 		wstandout(view->window);
1201 	waddwstr(view->window, wline);
1202 	while (width < view->ncols) {
1203 		waddch(view->window, ' ');
1204 		width++;
1205 	}
1206 	if (view_needs_focus_indication(view))
1207 		wstandend(view->window);
1208 	free(wline);
1209 	if (limit <= 1)
1210 		goto done;
1211 
1212 	/* Grow author column size if necessary. */
1213 	entry = first;
1214 	ncommits = 0;
1215 	while (entry) {
1216 		char *author;
1217 		wchar_t *wauthor;
1218 		int width;
1219 		if (ncommits >= limit - 1)
1220 			break;
1221 		author = strdup(got_object_commit_get_author(entry->commit));
1222 		if (author == NULL) {
1223 			err = got_error_from_errno("strdup");
1224 			goto done;
1225 		}
1226 		err = format_author(&wauthor, &width, author, COLS);
1227 		if (author_cols < width)
1228 			author_cols = width;
1229 		free(wauthor);
1230 		free(author);
1231 		entry = TAILQ_NEXT(entry, entry);
1232 	}
1233 
1234 	entry = first;
1235 	*last = first;
1236 	ncommits = 0;
1237 	while (entry) {
1238 		if (ncommits >= limit - 1)
1239 			break;
1240 		if (ncommits == selected_idx)
1241 			wstandout(view->window);
1242 		err = draw_commit(view, entry->commit, entry->id, refs,
1243 		    author_cols);
1244 		if (ncommits == selected_idx)
1245 			wstandend(view->window);
1246 		if (err)
1247 			break;
1248 		ncommits++;
1249 		*last = entry;
1250 		entry = TAILQ_NEXT(entry, entry);
1251 	}
1252 
1253 	view_vborder(view);
1254 done:
1255 	free(id_str);
1256 	free(refs_str);
1257 	free(ncommits_str);
1258 	free(header);
1259 	return err;
1260 }
1261 
1262 static void
1263 scroll_up(struct tog_view *view,
1264     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1265     struct commit_queue *commits)
1266 {
1267 	struct commit_queue_entry *entry;
1268 	int nscrolled = 0;
1269 
1270 	entry = TAILQ_FIRST(&commits->head);
1271 	if (*first_displayed_entry == entry)
1272 		return;
1273 
1274 	entry = *first_displayed_entry;
1275 	while (entry && nscrolled < maxscroll) {
1276 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1277 		if (entry) {
1278 			*first_displayed_entry = entry;
1279 			nscrolled++;
1280 		}
1281 	}
1282 }
1283 
1284 static const struct got_error *
1285 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1286     pthread_cond_t *need_commits)
1287 {
1288 	int errcode;
1289 	int max_wait = 20;
1290 
1291 	halfdelay(1); /* fast refresh while loading commits */
1292 
1293 	while (*commits_needed > 0) {
1294 		if (*log_complete)
1295 			break;
1296 
1297 		/* Wake the log thread. */
1298 		errcode = pthread_cond_signal(need_commits);
1299 		if (errcode)
1300 			return got_error_set_errno(errcode,
1301 			    "pthread_cond_signal");
1302 		errcode = pthread_mutex_unlock(&tog_mutex);
1303 		if (errcode)
1304 			return got_error_set_errno(errcode,
1305 			    "pthread_mutex_unlock");
1306 		pthread_yield();
1307 		errcode = pthread_mutex_lock(&tog_mutex);
1308 		if (errcode)
1309 			return got_error_set_errno(errcode,
1310 			    "pthread_mutex_lock");
1311 
1312 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1313 			/*
1314 			 * Thread is not done yet; lose a key press
1315 			 * and let the user retry... this way the GUI
1316 			 * remains interactive while logging deep paths
1317 			 * with few commits in history.
1318 			 */
1319 			return NULL;
1320 		}
1321 	}
1322 
1323 	return NULL;
1324 }
1325 
1326 static const struct got_error *
1327 scroll_down(struct tog_view *view,
1328     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1329     struct commit_queue_entry **last_displayed_entry,
1330     struct commit_queue *commits, int *log_complete, int *commits_needed,
1331     pthread_cond_t *need_commits)
1332 {
1333 	const struct got_error *err = NULL;
1334 	struct commit_queue_entry *pentry;
1335 	int nscrolled = 0;
1336 
1337 	if (*last_displayed_entry == NULL)
1338 		return NULL;
1339 
1340 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1341 	if (pentry == NULL && !*log_complete) {
1342 		/*
1343 		 * Ask the log thread for required amount of commits
1344 		 * plus some amount of pre-fetching.
1345 		 */
1346 		(*commits_needed) += maxscroll + 20;
1347 		err = trigger_log_thread(0, commits_needed, log_complete,
1348 		    need_commits);
1349 		if (err)
1350 			return err;
1351 	}
1352 
1353 	do {
1354 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1355 		if (pentry == NULL)
1356 			break;
1357 
1358 		*last_displayed_entry = pentry;
1359 
1360 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1361 		if (pentry == NULL)
1362 			break;
1363 		*first_displayed_entry = pentry;
1364 	} while (++nscrolled < maxscroll);
1365 
1366 	return err;
1367 }
1368 
1369 static const struct got_error *
1370 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1371     struct got_commit_object *commit, struct got_object_id *commit_id,
1372     struct tog_view *log_view, struct got_reflist_head *refs,
1373     struct got_repository *repo)
1374 {
1375 	const struct got_error *err;
1376 	struct got_object_qid *parent_id;
1377 	struct tog_view *diff_view;
1378 
1379 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1380 	if (diff_view == NULL)
1381 		return got_error_from_errno("view_open");
1382 
1383 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1384 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1385 	    commit_id, log_view, refs, repo);
1386 	if (err == NULL)
1387 		*new_view = diff_view;
1388 	return err;
1389 }
1390 
1391 static const struct got_error *
1392 tree_view_visit_subtree(struct got_tree_object *subtree,
1393     struct tog_tree_view_state *s)
1394 {
1395 	struct tog_parent_tree *parent;
1396 
1397 	parent = calloc(1, sizeof(*parent));
1398 	if (parent == NULL)
1399 		return got_error_from_errno("calloc");
1400 
1401 	parent->tree = s->tree;
1402 	parent->first_displayed_entry = s->first_displayed_entry;
1403 	parent->selected_entry = s->selected_entry;
1404 	parent->selected = s->selected;
1405 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
1406 	s->tree = subtree;
1407 	s->entries = got_object_tree_get_entries(s->tree);
1408 	s->selected = 0;
1409 	s->first_displayed_entry = NULL;
1410 	return NULL;
1411 }
1412 
1413 
1414 static const struct got_error *
1415 browse_commit_tree(struct tog_view **new_view, int begin_x,
1416     struct commit_queue_entry *entry, const char *path,
1417     struct got_reflist_head *refs, struct got_repository *repo)
1418 {
1419 	const struct got_error *err = NULL;
1420 	struct got_tree_object *tree;
1421 	struct got_tree_entry *te;
1422 	struct tog_tree_view_state *s;
1423 	struct tog_view *tree_view;
1424 	char *slash, *subpath = NULL;
1425 	const char *p;
1426 
1427 	err = got_object_open_as_tree(&tree, repo,
1428 	    got_object_commit_get_tree_id(entry->commit));
1429 	if (err)
1430 		return err;
1431 
1432 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1433 	if (tree_view == NULL)
1434 		return got_error_from_errno("view_open");
1435 
1436 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1437 	if (err) {
1438 		got_object_tree_close(tree);
1439 		return err;
1440 	}
1441 	s = &tree_view->state.tree;
1442 
1443 	*new_view = tree_view;
1444 
1445 	/* Walk the path and open corresponding tree objects. */
1446 	p = path;
1447 	while (*p) {
1448 		struct got_object_id *tree_id;
1449 
1450 		while (p[0] == '/')
1451 			p++;
1452 
1453 		/* Ensure the correct subtree entry is selected. */
1454 		slash = strchr(p, '/');
1455 		if (slash == NULL)
1456 			slash = strchr(p, '\0');
1457 		SIMPLEQ_FOREACH(te, &s->entries->head, entry) {
1458 			if (strncmp(p, te->name, slash - p) == 0) {
1459 				s->selected_entry = te;
1460 				break;
1461 			}
1462 			s->selected++;
1463 		}
1464 		if (s->selected_entry == NULL) {
1465 			err = got_error(GOT_ERR_NO_TREE_ENTRY);
1466 			break;
1467 		}
1468 		if (s->tree != s->root)
1469 			s->selected++; /* skip '..' */
1470 
1471 		if (!S_ISDIR(s->selected_entry->mode))
1472 			break;
1473 
1474 		slash = strchr(p, '/');
1475 		if (slash)
1476 			subpath = strndup(path, slash - path);
1477 		else
1478 			subpath = strdup(path);
1479 		if (subpath == NULL) {
1480 			err = got_error_from_errno("strdup");
1481 			break;
1482 		}
1483 
1484 		err = got_object_id_by_path(&tree_id, repo, entry->id,
1485 		    subpath);
1486 		if (err)
1487 			break;
1488 
1489 		err = got_object_open_as_tree(&tree, repo, tree_id);
1490 		free(tree_id);
1491 		if (err)
1492 			break;
1493 
1494 		err = tree_view_visit_subtree(tree, s);
1495 		if (err) {
1496 			got_object_tree_close(tree);
1497 			break;
1498 		}
1499 		if (slash == NULL)
1500 			break;
1501 		free(subpath);
1502 		subpath = NULL;
1503 		p = slash;
1504 	}
1505 
1506 	free(subpath);
1507 	return err;
1508 }
1509 
1510 static void *
1511 log_thread(void *arg)
1512 {
1513 	const struct got_error *err = NULL;
1514 	int errcode = 0;
1515 	struct tog_log_thread_args *a = arg;
1516 	int done = 0;
1517 
1518 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1519 	if (err)
1520 		return (void *)err;
1521 
1522 	while (!done && !err) {
1523 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1524 		    a->in_repo_path);
1525 		if (err) {
1526 			if (err->code != GOT_ERR_ITER_COMPLETED)
1527 				return (void *)err;
1528 			err = NULL;
1529 			done = 1;
1530 		} else if (a->commits_needed > 0)
1531 			a->commits_needed--;
1532 
1533 		errcode = pthread_mutex_lock(&tog_mutex);
1534 		if (errcode) {
1535 			err = got_error_set_errno(errcode,
1536 			    "pthread_mutex_lock");
1537 			break;
1538 		} else if (*a->quit)
1539 			done = 1;
1540 		else if (*a->first_displayed_entry == NULL) {
1541 			*a->first_displayed_entry =
1542 			    TAILQ_FIRST(&a->commits->head);
1543 			*a->selected_entry = *a->first_displayed_entry;
1544 		}
1545 
1546 		if (done)
1547 			a->commits_needed = 0;
1548 		else if (a->commits_needed == 0) {
1549 			errcode = pthread_cond_wait(&a->need_commits,
1550 			    &tog_mutex);
1551 			if (errcode)
1552 				err = got_error_set_errno(errcode,
1553 				    "pthread_cond_wait");
1554 		}
1555 
1556 		errcode = pthread_mutex_unlock(&tog_mutex);
1557 		if (errcode && err == NULL)
1558 			err = got_error_set_errno(errcode,
1559 			    "pthread_mutex_unlock");
1560 	}
1561 	a->log_complete = 1;
1562 	return (void *)err;
1563 }
1564 
1565 static const struct got_error *
1566 stop_log_thread(struct tog_log_view_state *s)
1567 {
1568 	const struct got_error *err = NULL;
1569 	int errcode;
1570 
1571 	if (s->thread) {
1572 		s->quit = 1;
1573 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1574 		if (errcode)
1575 			return got_error_set_errno(errcode,
1576 			    "pthread_cond_signal");
1577 		errcode = pthread_mutex_unlock(&tog_mutex);
1578 		if (errcode)
1579 			return got_error_set_errno(errcode,
1580 			    "pthread_mutex_unlock");
1581 		errcode = pthread_join(s->thread, (void **)&err);
1582 		if (errcode)
1583 			return got_error_set_errno(errcode, "pthread_join");
1584 		errcode = pthread_mutex_lock(&tog_mutex);
1585 		if (errcode)
1586 			return got_error_set_errno(errcode,
1587 			    "pthread_mutex_lock");
1588 		s->thread = NULL;
1589 	}
1590 
1591 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1592 	if (errcode && err == NULL)
1593 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
1594 
1595 	if (s->thread_args.repo) {
1596 		got_repo_close(s->thread_args.repo);
1597 		s->thread_args.repo = NULL;
1598 	}
1599 
1600 	if (s->thread_args.graph) {
1601 		got_commit_graph_close(s->thread_args.graph);
1602 		s->thread_args.graph = NULL;
1603 	}
1604 
1605 	return err;
1606 }
1607 
1608 static const struct got_error *
1609 close_log_view(struct tog_view *view)
1610 {
1611 	const struct got_error *err = NULL;
1612 	struct tog_log_view_state *s = &view->state.log;
1613 
1614 	err = stop_log_thread(s);
1615 	free_commits(&s->commits);
1616 	free(s->in_repo_path);
1617 	s->in_repo_path = NULL;
1618 	free(s->start_id);
1619 	s->start_id = NULL;
1620 	return err;
1621 }
1622 
1623 static const struct got_error *
1624 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1625     struct got_reflist_head *refs, struct got_repository *repo,
1626     const char *path, int check_disk)
1627 {
1628 	const struct got_error *err = NULL;
1629 	struct tog_log_view_state *s = &view->state.log;
1630 	struct got_repository *thread_repo = NULL;
1631 	struct got_commit_graph *thread_graph = NULL;
1632 	int errcode;
1633 
1634 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1635 	if (err != NULL)
1636 		goto done;
1637 
1638 	/* The commit queue only contains commits being displayed. */
1639 	TAILQ_INIT(&s->commits.head);
1640 	s->commits.ncommits = 0;
1641 
1642 	s->refs = refs;
1643 	s->repo = repo;
1644 	s->start_id = got_object_id_dup(start_id);
1645 	if (s->start_id == NULL) {
1646 		err = got_error_from_errno("got_object_id_dup");
1647 		goto done;
1648 	}
1649 
1650 	view->show = show_log_view;
1651 	view->input = input_log_view;
1652 	view->close = close_log_view;
1653 
1654 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1655 	if (err)
1656 		goto done;
1657 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1658 	    0, thread_repo);
1659 	if (err)
1660 		goto done;
1661 
1662 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1663 	if (errcode) {
1664 		err = got_error_set_errno(errcode, "pthread_cond_init");
1665 		goto done;
1666 	}
1667 
1668 	s->thread_args.commits_needed = view->nlines;
1669 	s->thread_args.graph = thread_graph;
1670 	s->thread_args.commits = &s->commits;
1671 	s->thread_args.in_repo_path = s->in_repo_path;
1672 	s->thread_args.start_id = s->start_id;
1673 	s->thread_args.repo = thread_repo;
1674 	s->thread_args.log_complete = 0;
1675 	s->thread_args.quit = &s->quit;
1676 	s->thread_args.view = view;
1677 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1678 	s->thread_args.selected_entry = &s->selected_entry;
1679 done:
1680 	if (err)
1681 		close_log_view(view);
1682 	return err;
1683 }
1684 
1685 static const struct got_error *
1686 show_log_view(struct tog_view *view)
1687 {
1688 	struct tog_log_view_state *s = &view->state.log;
1689 
1690 	if (s->thread == NULL) {
1691 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1692 		    &s->thread_args);
1693 		if (errcode)
1694 			return got_error_set_errno(errcode, "pthread_create");
1695 	}
1696 
1697 	return draw_commits(view, &s->last_displayed_entry,
1698 	    &s->selected_entry, s->first_displayed_entry,
1699 	    &s->commits, s->selected, view->nlines, s->refs,
1700 	    s->in_repo_path, s->thread_args.commits_needed);
1701 }
1702 
1703 static const struct got_error *
1704 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1705     struct tog_view **focus_view, struct tog_view *view, int ch)
1706 {
1707 	const struct got_error *err = NULL;
1708 	struct tog_log_view_state *s = &view->state.log;
1709 	char *parent_path;
1710 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1711 	int begin_x = 0;
1712 
1713 	switch (ch) {
1714 	case 'q':
1715 		s->quit = 1;
1716 		break;
1717 	case 'k':
1718 	case KEY_UP:
1719 	case '<':
1720 	case ',':
1721 		if (s->first_displayed_entry == NULL)
1722 			break;
1723 		if (s->selected > 0)
1724 			s->selected--;
1725 		if (s->selected > 0)
1726 			break;
1727 		scroll_up(view, &s->first_displayed_entry, 1,
1728 		    &s->commits);
1729 		break;
1730 	case KEY_PPAGE:
1731 	case CTRL('b'):
1732 		if (s->first_displayed_entry == NULL)
1733 			break;
1734 		if (TAILQ_FIRST(&s->commits.head) ==
1735 		    s->first_displayed_entry) {
1736 			s->selected = 0;
1737 			break;
1738 		}
1739 		scroll_up(view, &s->first_displayed_entry,
1740 		    view->nlines, &s->commits);
1741 		break;
1742 	case 'j':
1743 	case KEY_DOWN:
1744 	case '>':
1745 	case '.':
1746 		if (s->first_displayed_entry == NULL)
1747 			break;
1748 		if (s->selected < MIN(view->nlines - 2,
1749 		    s->commits.ncommits - 1)) {
1750 			s->selected++;
1751 			break;
1752 		}
1753 		err = scroll_down(view, &s->first_displayed_entry, 1,
1754 		    &s->last_displayed_entry, &s->commits,
1755 		    &s->thread_args.log_complete,
1756 		    &s->thread_args.commits_needed,
1757 		    &s->thread_args.need_commits);
1758 		break;
1759 	case KEY_NPAGE:
1760 	case CTRL('f'): {
1761 		struct commit_queue_entry *first;
1762 		first = s->first_displayed_entry;
1763 		if (first == NULL)
1764 			break;
1765 		err = scroll_down(view, &s->first_displayed_entry,
1766 		    view->nlines, &s->last_displayed_entry,
1767 		    &s->commits, &s->thread_args.log_complete,
1768 		    &s->thread_args.commits_needed,
1769 		    &s->thread_args.need_commits);
1770 		if (first == s->first_displayed_entry &&
1771 		    s->selected < MIN(view->nlines - 2,
1772 		    s->commits.ncommits - 1)) {
1773 			/* can't scroll further down */
1774 			s->selected = MIN(view->nlines - 2,
1775 			    s->commits.ncommits - 1);
1776 		}
1777 		err = NULL;
1778 		break;
1779 	}
1780 	case KEY_RESIZE:
1781 		if (s->selected > view->nlines - 2)
1782 			s->selected = view->nlines - 2;
1783 		if (s->selected > s->commits.ncommits - 1)
1784 			s->selected = s->commits.ncommits - 1;
1785 		break;
1786 	case KEY_ENTER:
1787 	case ' ':
1788 	case '\r':
1789 		if (s->selected_entry == NULL)
1790 			break;
1791 		if (view_is_parent_view(view))
1792 			begin_x = view_split_begin_x(view->begin_x);
1793 		err = open_diff_view_for_commit(&diff_view, begin_x,
1794 		    s->selected_entry->commit, s->selected_entry->id,
1795 		    view, s->refs, s->repo);
1796 		if (err)
1797 			break;
1798 		if (view_is_parent_view(view)) {
1799 			err = view_close_child(view);
1800 			if (err)
1801 				return err;
1802 			err = view_set_child(view, diff_view);
1803 			if (err) {
1804 				view_close(diff_view);
1805 				break;
1806 			}
1807 			*focus_view = diff_view;
1808 			view->child_focussed = 1;
1809 		} else
1810 			*new_view = diff_view;
1811 		break;
1812 	case 't':
1813 		if (s->selected_entry == NULL)
1814 			break;
1815 		if (view_is_parent_view(view))
1816 			begin_x = view_split_begin_x(view->begin_x);
1817 		err = browse_commit_tree(&tree_view, begin_x,
1818 		    s->selected_entry, s->in_repo_path, s->refs, s->repo);
1819 		if (err)
1820 			break;
1821 		if (view_is_parent_view(view)) {
1822 			err = view_close_child(view);
1823 			if (err)
1824 				return err;
1825 			err = view_set_child(view, tree_view);
1826 			if (err) {
1827 				view_close(tree_view);
1828 				break;
1829 			}
1830 			*focus_view = tree_view;
1831 			view->child_focussed = 1;
1832 		} else
1833 			*new_view = tree_view;
1834 		break;
1835 	case KEY_BACKSPACE:
1836 		if (strcmp(s->in_repo_path, "/") == 0)
1837 			break;
1838 		parent_path = dirname(s->in_repo_path);
1839 		if (parent_path && strcmp(parent_path, ".") != 0) {
1840 			struct tog_view *lv;
1841 			err = stop_log_thread(s);
1842 			if (err)
1843 				return err;
1844 			lv = view_open(view->nlines, view->ncols,
1845 			    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1846 			if (lv == NULL)
1847 				return got_error_from_errno(
1848 				    "view_open");
1849 			err = open_log_view(lv, s->start_id, s->refs,
1850 			    s->repo, parent_path, 0);
1851 			if (err)
1852 				return err;;
1853 			if (view_is_parent_view(view))
1854 				*new_view = lv;
1855 			else {
1856 				view_set_child(view->parent, lv);
1857 				*focus_view = lv;
1858 			}
1859 			return NULL;
1860 		}
1861 		break;
1862 	default:
1863 		break;
1864 	}
1865 
1866 	return err;
1867 }
1868 
1869 static const struct got_error *
1870 apply_unveil(const char *repo_path, const char *worktree_path)
1871 {
1872 	const struct got_error *error;
1873 
1874 	if (repo_path && unveil(repo_path, "r") != 0)
1875 		return got_error_from_errno2("unveil", repo_path);
1876 
1877 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1878 		return got_error_from_errno2("unveil", worktree_path);
1879 
1880 	if (unveil("/tmp", "rwc") != 0)
1881 		return got_error_from_errno2("unveil", "/tmp");
1882 
1883 	error = got_privsep_unveil_exec_helpers();
1884 	if (error != NULL)
1885 		return error;
1886 
1887 	if (unveil(NULL, NULL) != 0)
1888 		return got_error_from_errno("unveil");
1889 
1890 	return NULL;
1891 }
1892 
1893 static void
1894 init_curses(void)
1895 {
1896 	initscr();
1897 	cbreak();
1898 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1899 	noecho();
1900 	nonl();
1901 	intrflush(stdscr, FALSE);
1902 	keypad(stdscr, TRUE);
1903 	curs_set(0);
1904 	signal(SIGWINCH, tog_sigwinch);
1905 }
1906 
1907 static const struct got_error *
1908 cmd_log(int argc, char *argv[])
1909 {
1910 	const struct got_error *error;
1911 	struct got_repository *repo = NULL;
1912 	struct got_worktree *worktree = NULL;
1913 	struct got_reflist_head refs;
1914 	struct got_object_id *start_id = NULL;
1915 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1916 	char *start_commit = NULL;
1917 	int ch;
1918 	struct tog_view *view;
1919 
1920 	SIMPLEQ_INIT(&refs);
1921 
1922 #ifndef PROFILE
1923 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1924 	    NULL) == -1)
1925 		err(1, "pledge");
1926 #endif
1927 
1928 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1929 		switch (ch) {
1930 		case 'c':
1931 			start_commit = optarg;
1932 			break;
1933 		case 'r':
1934 			repo_path = realpath(optarg, NULL);
1935 			if (repo_path == NULL)
1936 				err(1, "-r option");
1937 			break;
1938 		default:
1939 			usage_log();
1940 			/* NOTREACHED */
1941 		}
1942 	}
1943 
1944 	argc -= optind;
1945 	argv += optind;
1946 
1947 	cwd = getcwd(NULL, 0);
1948 	if (cwd == NULL) {
1949 		error = got_error_from_errno("getcwd");
1950 		goto done;
1951 	}
1952 	error = got_worktree_open(&worktree, cwd);
1953 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
1954 		goto done;
1955 	error = NULL;
1956 
1957 	if (argc == 0) {
1958 		path = strdup("");
1959 		if (path == NULL) {
1960 			error = got_error_from_errno("strdup");
1961 			goto done;
1962 		}
1963 	} else if (argc == 1) {
1964 		if (worktree) {
1965 			error = got_worktree_resolve_path(&path, worktree,
1966 			    argv[0]);
1967 			if (error)
1968 				goto done;
1969 		} else {
1970 			path = strdup(argv[0]);
1971 			if (path == NULL) {
1972 				error = got_error_from_errno("strdup");
1973 				goto done;
1974 			}
1975 		}
1976 	} else
1977 		usage_log();
1978 
1979 	repo_path = worktree ?
1980 	    strdup(got_worktree_get_repo_path(worktree)) : strdup(cwd);
1981 	if (repo_path == NULL) {
1982 		error = got_error_from_errno("strdup");
1983 		goto done;
1984 	}
1985 
1986 	init_curses();
1987 
1988 	error = got_repo_open(&repo, repo_path);
1989 	if (error != NULL)
1990 		goto done;
1991 
1992 	error = apply_unveil(got_repo_get_path(repo),
1993 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1994 	if (error)
1995 		goto done;
1996 
1997 	if (start_commit == NULL)
1998 		error = get_head_commit_id(&start_id, worktree ?
1999 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
2000 		    repo);
2001 	else
2002 		error = got_object_resolve_id_str(&start_id, repo,
2003 		    start_commit);
2004 	if (error != NULL)
2005 		goto done;
2006 
2007 	error = got_ref_list(&refs, repo);
2008 	if (error)
2009 		goto done;
2010 
2011 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
2012 	if (view == NULL) {
2013 		error = got_error_from_errno("view_open");
2014 		goto done;
2015 	}
2016 	error = open_log_view(view, start_id, &refs, repo, path, 1);
2017 	if (error)
2018 		goto done;
2019 	error = view_loop(view);
2020 done:
2021 	free(repo_path);
2022 	free(cwd);
2023 	free(path);
2024 	free(start_id);
2025 	if (repo)
2026 		got_repo_close(repo);
2027 	if (worktree)
2028 		got_worktree_close(worktree);
2029 	got_ref_list_free(&refs);
2030 	return error;
2031 }
2032 
2033 __dead static void
2034 usage_diff(void)
2035 {
2036 	endwin();
2037 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
2038 	    getprogname());
2039 	exit(1);
2040 }
2041 
2042 static char *
2043 parse_next_line(FILE *f, size_t *len)
2044 {
2045 	char *line;
2046 	size_t linelen;
2047 	size_t lineno;
2048 	const char delim[3] = { '\0', '\0', '\0'};
2049 
2050 	line = fparseln(f, &linelen, &lineno, delim, 0);
2051 	if (len)
2052 		*len = linelen;
2053 	return line;
2054 }
2055 
2056 static const struct got_error *
2057 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
2058     int *last_displayed_line, int *eof, int max_lines,
2059     char *header)
2060 {
2061 	const struct got_error *err;
2062 	int nlines = 0, nprinted = 0;
2063 	char *line;
2064 	size_t len;
2065 	wchar_t *wline;
2066 	int width;
2067 
2068 	rewind(f);
2069 	werase(view->window);
2070 
2071 	if (header) {
2072 		err = format_line(&wline, &width, header, view->ncols);
2073 		if (err) {
2074 			return err;
2075 		}
2076 
2077 		if (view_needs_focus_indication(view))
2078 			wstandout(view->window);
2079 		waddwstr(view->window, wline);
2080 		if (view_needs_focus_indication(view))
2081 			wstandend(view->window);
2082 		if (width < view->ncols)
2083 			waddch(view->window, '\n');
2084 
2085 		if (max_lines <= 1)
2086 			return NULL;
2087 		max_lines--;
2088 	}
2089 
2090 	*eof = 0;
2091 	while (nprinted < max_lines) {
2092 		line = parse_next_line(f, &len);
2093 		if (line == NULL) {
2094 			*eof = 1;
2095 			break;
2096 		}
2097 		if (++nlines < *first_displayed_line) {
2098 			free(line);
2099 			continue;
2100 		}
2101 
2102 		err = format_line(&wline, &width, line, view->ncols);
2103 		if (err) {
2104 			free(line);
2105 			return err;
2106 		}
2107 		waddwstr(view->window, wline);
2108 		if (width < view->ncols)
2109 			waddch(view->window, '\n');
2110 		if (++nprinted == 1)
2111 			*first_displayed_line = nlines;
2112 		free(line);
2113 		free(wline);
2114 		wline = NULL;
2115 	}
2116 	*last_displayed_line = nlines;
2117 
2118 	view_vborder(view);
2119 
2120 	if (*eof) {
2121 		while (nprinted < view->nlines) {
2122 			waddch(view->window, '\n');
2123 			nprinted++;
2124 		}
2125 
2126 		err = format_line(&wline, &width, TOG_EOF_STRING, view->ncols);
2127 		if (err) {
2128 			return err;
2129 		}
2130 
2131 		wstandout(view->window);
2132 		waddwstr(view->window, wline);
2133 		wstandend(view->window);
2134 	}
2135 
2136 	return NULL;
2137 }
2138 
2139 static char *
2140 get_datestr(time_t *time, char *datebuf)
2141 {
2142 	char *p, *s = ctime_r(time, datebuf);
2143 	p = strchr(s, '\n');
2144 	if (p)
2145 		*p = '\0';
2146 	return s;
2147 }
2148 
2149 static const struct got_error *
2150 write_commit_info(struct got_object_id *commit_id,
2151     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2152 {
2153 	const struct got_error *err = NULL;
2154 	char datebuf[26];
2155 	struct got_commit_object *commit;
2156 	char *id_str = NULL;
2157 	time_t committer_time;
2158 	const char *author, *committer;
2159 	char *refs_str = NULL;
2160 
2161 	if (refs) {
2162 		err = build_refs_str(&refs_str, refs, commit_id);
2163 		if (err)
2164 			return err;
2165 	}
2166 
2167 	err = got_object_open_as_commit(&commit, repo, commit_id);
2168 	if (err)
2169 		return err;
2170 
2171 	err = got_object_id_str(&id_str, commit_id);
2172 	if (err) {
2173 		err = got_error_from_errno("got_object_id_str");
2174 		goto done;
2175 	}
2176 
2177 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2178 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2179 		err = got_error_from_errno("fprintf");
2180 		goto done;
2181 	}
2182 	if (fprintf(outfile, "from: %s\n",
2183 	    got_object_commit_get_author(commit)) < 0) {
2184 		err = got_error_from_errno("fprintf");
2185 		goto done;
2186 	}
2187 	committer_time = got_object_commit_get_committer_time(commit);
2188 	if (fprintf(outfile, "date: %s UTC\n",
2189 	    get_datestr(&committer_time, datebuf)) < 0) {
2190 		err = got_error_from_errno("fprintf");
2191 		goto done;
2192 	}
2193 	author = got_object_commit_get_author(commit);
2194 	committer = got_object_commit_get_committer(commit);
2195 	if (strcmp(author, committer) != 0 &&
2196 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2197 		err = got_error_from_errno("fprintf");
2198 		goto done;
2199 	}
2200 	if (fprintf(outfile, "%s\n",
2201 	    got_object_commit_get_logmsg(commit)) < 0) {
2202 		err = got_error_from_errno("fprintf");
2203 		goto done;
2204 	}
2205 done:
2206 	free(id_str);
2207 	free(refs_str);
2208 	got_object_commit_close(commit);
2209 	return err;
2210 }
2211 
2212 static const struct got_error *
2213 create_diff(struct tog_diff_view_state *s)
2214 {
2215 	const struct got_error *err = NULL;
2216 	FILE *f = NULL;
2217 	int obj_type;
2218 
2219 	f = got_opentemp();
2220 	if (f == NULL) {
2221 		err = got_error_from_errno("got_opentemp");
2222 		goto done;
2223 	}
2224 	if (s->f && fclose(s->f) != 0) {
2225 		err = got_error_from_errno("fclose");
2226 		goto done;
2227 	}
2228 	s->f = f;
2229 
2230 	if (s->id1)
2231 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2232 	else
2233 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2234 	if (err)
2235 		goto done;
2236 
2237 	switch (obj_type) {
2238 	case GOT_OBJ_TYPE_BLOB:
2239 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2240 		    s->diff_context, s->repo, f);
2241 		break;
2242 	case GOT_OBJ_TYPE_TREE:
2243 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2244 		    s->diff_context, s->repo, f);
2245 		break;
2246 	case GOT_OBJ_TYPE_COMMIT: {
2247 		const struct got_object_id_queue *parent_ids;
2248 		struct got_object_qid *pid;
2249 		struct got_commit_object *commit2;
2250 
2251 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2252 		if (err)
2253 			break;
2254 		/* Show commit info if we're diffing to a parent/root commit. */
2255 		if (s->id1 == NULL)
2256 			write_commit_info(s->id2, s->refs, s->repo, f);
2257 		else {
2258 			parent_ids = got_object_commit_get_parent_ids(commit2);
2259 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2260 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2261 					write_commit_info(s->id2, s->refs,
2262 					    s->repo, f);
2263 					break;
2264 				}
2265 			}
2266 		}
2267 		got_object_commit_close(commit2);
2268 
2269 		err = got_diff_objects_as_commits(s->id1, s->id2,
2270 		    s->diff_context, s->repo, f);
2271 		break;
2272 	}
2273 	default:
2274 		err = got_error(GOT_ERR_OBJ_TYPE);
2275 		break;
2276 	}
2277 done:
2278 	if (f && fflush(f) != 0 && err == NULL)
2279 		err = got_error_from_errno("fflush");
2280 	return err;
2281 }
2282 
2283 static void
2284 diff_view_indicate_progress(struct tog_view *view)
2285 {
2286 	mvwaddstr(view->window, 0, 0, "diffing...");
2287 	update_panels();
2288 	doupdate();
2289 }
2290 
2291 static const struct got_error *
2292 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2293     struct got_object_id *id2, struct tog_view *log_view,
2294     struct got_reflist_head *refs, struct got_repository *repo)
2295 {
2296 	const struct got_error *err;
2297 
2298 	if (id1 != NULL && id2 != NULL) {
2299 	    int type1, type2;
2300 	    err = got_object_get_type(&type1, repo, id1);
2301 	    if (err)
2302 		return err;
2303 	    err = got_object_get_type(&type2, repo, id2);
2304 	    if (err)
2305 		return err;
2306 
2307 	    if (type1 != type2)
2308 		return got_error(GOT_ERR_OBJ_TYPE);
2309 	}
2310 
2311 	if (id1) {
2312 		view->state.diff.id1 = got_object_id_dup(id1);
2313 		if (view->state.diff.id1 == NULL)
2314 			return got_error_from_errno("got_object_id_dup");
2315 	} else
2316 		view->state.diff.id1 = NULL;
2317 
2318 	view->state.diff.id2 = got_object_id_dup(id2);
2319 	if (view->state.diff.id2 == NULL) {
2320 		free(view->state.diff.id1);
2321 		view->state.diff.id1 = NULL;
2322 		return got_error_from_errno("got_object_id_dup");
2323 	}
2324 	view->state.diff.f = NULL;
2325 	view->state.diff.first_displayed_line = 1;
2326 	view->state.diff.last_displayed_line = view->nlines;
2327 	view->state.diff.diff_context = 3;
2328 	view->state.diff.log_view = log_view;
2329 	view->state.diff.repo = repo;
2330 	view->state.diff.refs = refs;
2331 
2332 	if (log_view && view_is_splitscreen(view))
2333 		show_log_view(log_view); /* draw vborder */
2334 	diff_view_indicate_progress(view);
2335 
2336 	err = create_diff(&view->state.diff);
2337 	if (err) {
2338 		free(view->state.diff.id1);
2339 		view->state.diff.id1 = NULL;
2340 		free(view->state.diff.id2);
2341 		view->state.diff.id2 = NULL;
2342 		return err;
2343 	}
2344 
2345 	view->show = show_diff_view;
2346 	view->input = input_diff_view;
2347 	view->close = close_diff_view;
2348 
2349 	return NULL;
2350 }
2351 
2352 static const struct got_error *
2353 close_diff_view(struct tog_view *view)
2354 {
2355 	const struct got_error *err = NULL;
2356 
2357 	free(view->state.diff.id1);
2358 	view->state.diff.id1 = NULL;
2359 	free(view->state.diff.id2);
2360 	view->state.diff.id2 = NULL;
2361 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2362 		err = got_error_from_errno("fclose");
2363 	return err;
2364 }
2365 
2366 static const struct got_error *
2367 show_diff_view(struct tog_view *view)
2368 {
2369 	const struct got_error *err;
2370 	struct tog_diff_view_state *s = &view->state.diff;
2371 	char *id_str1 = NULL, *id_str2, *header;
2372 
2373 	if (s->id1) {
2374 		err = got_object_id_str(&id_str1, s->id1);
2375 		if (err)
2376 			return err;
2377 	}
2378 	err = got_object_id_str(&id_str2, s->id2);
2379 	if (err)
2380 		return err;
2381 
2382 	if (asprintf(&header, "diff %s %s",
2383 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2384 		err = got_error_from_errno("asprintf");
2385 		free(id_str1);
2386 		free(id_str2);
2387 		return err;
2388 	}
2389 	free(id_str1);
2390 	free(id_str2);
2391 
2392 	return draw_file(view, s->f, &s->first_displayed_line,
2393 	    &s->last_displayed_line, &s->eof, view->nlines,
2394 	    header);
2395 }
2396 
2397 static const struct got_error *
2398 set_selected_commit(struct tog_diff_view_state *s,
2399     struct commit_queue_entry *entry)
2400 {
2401 	const struct got_error *err;
2402 	const struct got_object_id_queue *parent_ids;
2403 	struct got_commit_object *selected_commit;
2404 	struct got_object_qid *pid;
2405 
2406 	free(s->id2);
2407 	s->id2 = got_object_id_dup(entry->id);
2408 	if (s->id2 == NULL)
2409 		return got_error_from_errno("got_object_id_dup");
2410 
2411 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2412 	if (err)
2413 		return err;
2414 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2415 	free(s->id1);
2416 	pid = SIMPLEQ_FIRST(parent_ids);
2417 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2418 	got_object_commit_close(selected_commit);
2419 	return NULL;
2420 }
2421 
2422 static const struct got_error *
2423 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2424     struct tog_view **focus_view, struct tog_view *view, int ch)
2425 {
2426 	const struct got_error *err = NULL;
2427 	struct tog_diff_view_state *s = &view->state.diff;
2428 	struct tog_log_view_state *ls;
2429 	struct commit_queue_entry *entry;
2430 	int i;
2431 
2432 	switch (ch) {
2433 	case 'k':
2434 	case KEY_UP:
2435 		if (s->first_displayed_line > 1)
2436 			s->first_displayed_line--;
2437 		break;
2438 	case KEY_PPAGE:
2439 	case CTRL('b'):
2440 		if (s->first_displayed_line == 1)
2441 			break;
2442 		i = 0;
2443 		while (i++ < view->nlines - 1 &&
2444 		    s->first_displayed_line > 1)
2445 			s->first_displayed_line--;
2446 		break;
2447 	case 'j':
2448 	case KEY_DOWN:
2449 		if (!s->eof)
2450 			s->first_displayed_line++;
2451 		break;
2452 	case KEY_NPAGE:
2453 	case CTRL('f'):
2454 	case ' ':
2455 		if (s->eof)
2456 			break;
2457 		i = 0;
2458 		while (!s->eof && i++ < view->nlines - 1) {
2459 			char *line;
2460 			line = parse_next_line(s->f, NULL);
2461 			s->first_displayed_line++;
2462 			if (line == NULL)
2463 				break;
2464 		}
2465 		break;
2466 	case '[':
2467 		if (s->diff_context > 0) {
2468 			s->diff_context--;
2469 			diff_view_indicate_progress(view);
2470 			err = create_diff(s);
2471 		}
2472 		break;
2473 	case ']':
2474 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2475 			s->diff_context++;
2476 			diff_view_indicate_progress(view);
2477 			err = create_diff(s);
2478 		}
2479 		break;
2480 	case '<':
2481 	case ',':
2482 		if (s->log_view == NULL)
2483 			break;
2484 		ls = &s->log_view->state.log;
2485 		entry = TAILQ_PREV(ls->selected_entry,
2486 		    commit_queue_head, entry);
2487 		if (entry == NULL)
2488 			break;
2489 
2490 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2491 		    KEY_UP);
2492 		if (err)
2493 			break;
2494 
2495 		err = set_selected_commit(s, entry);
2496 		if (err)
2497 			break;
2498 
2499 		s->first_displayed_line = 1;
2500 		s->last_displayed_line = view->nlines;
2501 
2502 		diff_view_indicate_progress(view);
2503 		err = create_diff(s);
2504 		break;
2505 	case '>':
2506 	case '.':
2507 		if (s->log_view == NULL)
2508 			break;
2509 		ls = &s->log_view->state.log;
2510 
2511 		if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2512 			ls->thread_args.commits_needed++;
2513 
2514 			/* Display "loading..." in log view. */
2515 			show_log_view(s->log_view);
2516 			update_panels();
2517 			doupdate();
2518 
2519 			err = trigger_log_thread(1 /* load_all */,
2520 			    &ls->thread_args.commits_needed,
2521 			    &ls->thread_args.log_complete,
2522 			    &ls->thread_args.need_commits);
2523 			if (err)
2524 				break;
2525 		}
2526 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2527 		    KEY_DOWN);
2528 		if (err)
2529 			break;
2530 
2531 		entry = TAILQ_NEXT(ls->selected_entry, entry);
2532 		if (entry == NULL)
2533 			break;
2534 
2535 		err = set_selected_commit(s, entry);
2536 		if (err)
2537 			break;
2538 
2539 		s->first_displayed_line = 1;
2540 		s->last_displayed_line = view->nlines;
2541 
2542 		diff_view_indicate_progress(view);
2543 		err = create_diff(s);
2544 		break;
2545 	default:
2546 		break;
2547 	}
2548 
2549 	return err;
2550 }
2551 
2552 static const struct got_error *
2553 cmd_diff(int argc, char *argv[])
2554 {
2555 	const struct got_error *error = NULL;
2556 	struct got_repository *repo = NULL;
2557 	struct got_reflist_head refs;
2558 	struct got_object_id *id1 = NULL, *id2 = NULL;
2559 	char *repo_path = NULL;
2560 	char *id_str1 = NULL, *id_str2 = NULL;
2561 	int ch;
2562 	struct tog_view *view;
2563 
2564 	SIMPLEQ_INIT(&refs);
2565 
2566 #ifndef PROFILE
2567 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2568 	    NULL) == -1)
2569 		err(1, "pledge");
2570 #endif
2571 
2572 	while ((ch = getopt(argc, argv, "")) != -1) {
2573 		switch (ch) {
2574 		default:
2575 			usage_diff();
2576 			/* NOTREACHED */
2577 		}
2578 	}
2579 
2580 	argc -= optind;
2581 	argv += optind;
2582 
2583 	if (argc == 0) {
2584 		usage_diff(); /* TODO show local worktree changes */
2585 	} else if (argc == 2) {
2586 		repo_path = getcwd(NULL, 0);
2587 		if (repo_path == NULL)
2588 			return got_error_from_errno("getcwd");
2589 		id_str1 = argv[0];
2590 		id_str2 = argv[1];
2591 	} else if (argc == 3) {
2592 		repo_path = realpath(argv[0], NULL);
2593 		if (repo_path == NULL)
2594 			return got_error_from_errno2("realpath", argv[0]);
2595 		id_str1 = argv[1];
2596 		id_str2 = argv[2];
2597 	} else
2598 		usage_diff();
2599 
2600 	init_curses();
2601 
2602 	error = got_repo_open(&repo, repo_path);
2603 	if (error)
2604 		goto done;
2605 
2606 	error = apply_unveil(got_repo_get_path(repo), NULL);
2607 	if (error)
2608 		goto done;
2609 
2610 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2611 	if (error)
2612 		goto done;
2613 
2614 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2615 	if (error)
2616 		goto done;
2617 
2618 	error = got_ref_list(&refs, repo);
2619 	if (error)
2620 		goto done;
2621 
2622 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2623 	if (view == NULL) {
2624 		error = got_error_from_errno("view_open");
2625 		goto done;
2626 	}
2627 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2628 	if (error)
2629 		goto done;
2630 	error = view_loop(view);
2631 done:
2632 	free(repo_path);
2633 	got_repo_close(repo);
2634 	got_ref_list_free(&refs);
2635 	return error;
2636 }
2637 
2638 __dead static void
2639 usage_blame(void)
2640 {
2641 	endwin();
2642 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2643 	    getprogname());
2644 	exit(1);
2645 }
2646 
2647 struct tog_blame_line {
2648 	int annotated;
2649 	struct got_object_id *id;
2650 };
2651 
2652 static const struct got_error *
2653 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2654     const char *path, struct tog_blame_line *lines, int nlines,
2655     int blame_complete, int selected_line, int *first_displayed_line,
2656     int *last_displayed_line, int *eof, int max_lines)
2657 {
2658 	const struct got_error *err;
2659 	int lineno = 0, nprinted = 0;
2660 	char *line;
2661 	size_t len;
2662 	wchar_t *wline;
2663 	int width, wlimit;
2664 	struct tog_blame_line *blame_line;
2665 	struct got_object_id *prev_id = NULL;
2666 	char *id_str;
2667 
2668 	err = got_object_id_str(&id_str, id);
2669 	if (err)
2670 		return err;
2671 
2672 	rewind(f);
2673 	werase(view->window);
2674 
2675 	if (asprintf(&line, "commit %s", id_str) == -1) {
2676 		err = got_error_from_errno("asprintf");
2677 		free(id_str);
2678 		return err;
2679 	}
2680 
2681 	err = format_line(&wline, &width, line, view->ncols);
2682 	free(line);
2683 	line = NULL;
2684 	if (view_needs_focus_indication(view))
2685 		wstandout(view->window);
2686 	waddwstr(view->window, wline);
2687 	if (view_needs_focus_indication(view))
2688 		wstandend(view->window);
2689 	free(wline);
2690 	wline = NULL;
2691 	if (width < view->ncols)
2692 		waddch(view->window, '\n');
2693 
2694 	if (asprintf(&line, "[%d/%d] %s%s",
2695 	    *first_displayed_line - 1 + selected_line, nlines,
2696 	    blame_complete ? "" : "annotating... ", path) == -1) {
2697 		free(id_str);
2698 		return got_error_from_errno("asprintf");
2699 	}
2700 	free(id_str);
2701 	err = format_line(&wline, &width, line, view->ncols);
2702 	free(line);
2703 	line = NULL;
2704 	if (err)
2705 		return err;
2706 	waddwstr(view->window, wline);
2707 	free(wline);
2708 	wline = NULL;
2709 	if (width < view->ncols)
2710 		waddch(view->window, '\n');
2711 
2712 	*eof = 0;
2713 	while (nprinted < max_lines - 2) {
2714 		line = parse_next_line(f, &len);
2715 		if (line == NULL) {
2716 			*eof = 1;
2717 			break;
2718 		}
2719 		if (++lineno < *first_displayed_line) {
2720 			free(line);
2721 			continue;
2722 		}
2723 
2724 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2725 		err = format_line(&wline, &width, line, wlimit);
2726 		if (err) {
2727 			free(line);
2728 			return err;
2729 		}
2730 
2731 		if (view->focussed && nprinted == selected_line - 1)
2732 			wstandout(view->window);
2733 
2734 		blame_line = &lines[lineno - 1];
2735 		if (blame_line->annotated && prev_id &&
2736 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2737 			waddstr(view->window, "         ");
2738 		else if (blame_line->annotated) {
2739 			char *id_str;
2740 			err = got_object_id_str(&id_str, blame_line->id);
2741 			if (err) {
2742 				free(line);
2743 				free(wline);
2744 				return err;
2745 			}
2746 			wprintw(view->window, "%.8s ", id_str);
2747 			free(id_str);
2748 			prev_id = blame_line->id;
2749 		} else {
2750 			waddstr(view->window, "........ ");
2751 			prev_id = NULL;
2752 		}
2753 
2754 		waddwstr(view->window, wline);
2755 		while (width < wlimit) {
2756 			waddch(view->window, ' ');
2757 			width++;
2758 		}
2759 		if (view->focussed && nprinted == selected_line - 1)
2760 			wstandend(view->window);
2761 		if (++nprinted == 1)
2762 			*first_displayed_line = lineno;
2763 		free(line);
2764 		free(wline);
2765 		wline = NULL;
2766 	}
2767 	*last_displayed_line = lineno;
2768 
2769 	view_vborder(view);
2770 
2771 	return NULL;
2772 }
2773 
2774 static const struct got_error *
2775 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2776 {
2777 	const struct got_error *err = NULL;
2778 	struct tog_blame_cb_args *a = arg;
2779 	struct tog_blame_line *line;
2780 	int errcode;
2781 
2782 	if (nlines != a->nlines ||
2783 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2784 		return got_error(GOT_ERR_RANGE);
2785 
2786 	errcode = pthread_mutex_lock(&tog_mutex);
2787 	if (errcode)
2788 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2789 
2790 	if (*a->quit) {	/* user has quit the blame view */
2791 		err = got_error(GOT_ERR_ITER_COMPLETED);
2792 		goto done;
2793 	}
2794 
2795 	if (lineno == -1)
2796 		goto done; /* no change in this commit */
2797 
2798 	line = &a->lines[lineno - 1];
2799 	if (line->annotated)
2800 		goto done;
2801 
2802 	line->id = got_object_id_dup(id);
2803 	if (line->id == NULL) {
2804 		err = got_error_from_errno("got_object_id_dup");
2805 		goto done;
2806 	}
2807 	line->annotated = 1;
2808 done:
2809 	errcode = pthread_mutex_unlock(&tog_mutex);
2810 	if (errcode)
2811 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2812 	return err;
2813 }
2814 
2815 static void *
2816 blame_thread(void *arg)
2817 {
2818 	const struct got_error *err;
2819 	struct tog_blame_thread_args *ta = arg;
2820 	struct tog_blame_cb_args *a = ta->cb_args;
2821 	int errcode;
2822 
2823 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2824 	    blame_cb, ta->cb_args);
2825 
2826 	errcode = pthread_mutex_lock(&tog_mutex);
2827 	if (errcode)
2828 		return (void *)got_error_set_errno(errcode,
2829 		    "pthread_mutex_lock");
2830 
2831 	got_repo_close(ta->repo);
2832 	ta->repo = NULL;
2833 	*ta->complete = 1;
2834 
2835 	errcode = pthread_mutex_unlock(&tog_mutex);
2836 	if (errcode && err == NULL)
2837 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2838 
2839 	return (void *)err;
2840 }
2841 
2842 static struct got_object_id *
2843 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2844     int selected_line)
2845 {
2846 	struct tog_blame_line *line;
2847 
2848 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2849 	if (!line->annotated)
2850 		return NULL;
2851 
2852 	return line->id;
2853 }
2854 
2855 static const struct got_error *
2856 stop_blame(struct tog_blame *blame)
2857 {
2858 	const struct got_error *err = NULL;
2859 	int i;
2860 
2861 	if (blame->thread) {
2862 		int errcode;
2863 		errcode = pthread_mutex_unlock(&tog_mutex);
2864 		if (errcode)
2865 			return got_error_set_errno(errcode,
2866 			    "pthread_mutex_unlock");
2867 		errcode = pthread_join(blame->thread, (void **)&err);
2868 		if (errcode)
2869 			return got_error_set_errno(errcode, "pthread_join");
2870 		errcode = pthread_mutex_lock(&tog_mutex);
2871 		if (errcode)
2872 			return got_error_set_errno(errcode,
2873 			    "pthread_mutex_lock");
2874 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2875 			err = NULL;
2876 		blame->thread = NULL;
2877 	}
2878 	if (blame->thread_args.repo) {
2879 		got_repo_close(blame->thread_args.repo);
2880 		blame->thread_args.repo = NULL;
2881 	}
2882 	if (blame->f) {
2883 		if (fclose(blame->f) != 0 && err == NULL)
2884 			err = got_error_from_errno("fclose");
2885 		blame->f = NULL;
2886 	}
2887 	if (blame->lines) {
2888 		for (i = 0; i < blame->nlines; i++)
2889 			free(blame->lines[i].id);
2890 		free(blame->lines);
2891 		blame->lines = NULL;
2892 	}
2893 	free(blame->cb_args.commit_id);
2894 	blame->cb_args.commit_id = NULL;
2895 
2896 	return err;
2897 }
2898 
2899 static const struct got_error *
2900 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2901     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2902     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2903     struct got_repository *repo)
2904 {
2905 	const struct got_error *err = NULL;
2906 	struct got_blob_object *blob = NULL;
2907 	struct got_repository *thread_repo = NULL;
2908 	struct got_object_id *obj_id = NULL;
2909 	int obj_type;
2910 
2911 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2912 	if (err)
2913 		return err;
2914 	if (obj_id == NULL)
2915 		return got_error(GOT_ERR_NO_OBJ);
2916 
2917 	err = got_object_get_type(&obj_type, repo, obj_id);
2918 	if (err)
2919 		goto done;
2920 
2921 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2922 		err = got_error(GOT_ERR_OBJ_TYPE);
2923 		goto done;
2924 	}
2925 
2926 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2927 	if (err)
2928 		goto done;
2929 	blame->f = got_opentemp();
2930 	if (blame->f == NULL) {
2931 		err = got_error_from_errno("got_opentemp");
2932 		goto done;
2933 	}
2934 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2935 	    blame->f, blob);
2936 	if (err)
2937 		goto done;
2938 
2939 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2940 	if (blame->lines == NULL) {
2941 		err = got_error_from_errno("calloc");
2942 		goto done;
2943 	}
2944 
2945 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2946 	if (err)
2947 		goto done;
2948 
2949 	blame->cb_args.view = view;
2950 	blame->cb_args.lines = blame->lines;
2951 	blame->cb_args.nlines = blame->nlines;
2952 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2953 	if (blame->cb_args.commit_id == NULL) {
2954 		err = got_error_from_errno("got_object_id_dup");
2955 		goto done;
2956 	}
2957 	blame->cb_args.quit = done;
2958 
2959 	blame->thread_args.path = path;
2960 	blame->thread_args.repo = thread_repo;
2961 	blame->thread_args.cb_args = &blame->cb_args;
2962 	blame->thread_args.complete = blame_complete;
2963 	*blame_complete = 0;
2964 
2965 done:
2966 	if (blob)
2967 		got_object_blob_close(blob);
2968 	free(obj_id);
2969 	if (err)
2970 		stop_blame(blame);
2971 	return err;
2972 }
2973 
2974 static const struct got_error *
2975 open_blame_view(struct tog_view *view, char *path,
2976     struct got_object_id *commit_id, struct got_reflist_head *refs,
2977     struct got_repository *repo)
2978 {
2979 	const struct got_error *err = NULL;
2980 	struct tog_blame_view_state *s = &view->state.blame;
2981 
2982 	SIMPLEQ_INIT(&s->blamed_commits);
2983 
2984 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2985 	if (err)
2986 		return err;
2987 
2988 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2989 	s->first_displayed_line = 1;
2990 	s->last_displayed_line = view->nlines;
2991 	s->selected_line = 1;
2992 	s->blame_complete = 0;
2993 	s->path = path;
2994 	if (s->path == NULL)
2995 		return got_error_from_errno("open_blame_view");
2996 	s->repo = repo;
2997 	s->refs = refs;
2998 	s->commit_id = commit_id;
2999 	memset(&s->blame, 0, sizeof(s->blame));
3000 
3001 	view->show = show_blame_view;
3002 	view->input = input_blame_view;
3003 	view->close = close_blame_view;
3004 
3005 	return run_blame(&s->blame, view, &s->blame_complete,
3006 	    &s->first_displayed_line, &s->last_displayed_line,
3007 	    &s->selected_line, &s->done, &s->eof, s->path,
3008 	    s->blamed_commit->id, s->repo);
3009 }
3010 
3011 static const struct got_error *
3012 close_blame_view(struct tog_view *view)
3013 {
3014 	const struct got_error *err = NULL;
3015 	struct tog_blame_view_state *s = &view->state.blame;
3016 
3017 	if (s->blame.thread)
3018 		err = stop_blame(&s->blame);
3019 
3020 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
3021 		struct got_object_qid *blamed_commit;
3022 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
3023 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3024 		got_object_qid_free(blamed_commit);
3025 	}
3026 
3027 	free(s->path);
3028 
3029 	return err;
3030 }
3031 
3032 static const struct got_error *
3033 show_blame_view(struct tog_view *view)
3034 {
3035 	const struct got_error *err = NULL;
3036 	struct tog_blame_view_state *s = &view->state.blame;
3037 	int errcode;
3038 
3039 	if (s->blame.thread == NULL) {
3040 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
3041 		    &s->blame.thread_args);
3042 		if (errcode)
3043 			return got_error_set_errno(errcode, "pthread_create");
3044 	}
3045 
3046 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
3047 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
3048 	    s->selected_line, &s->first_displayed_line,
3049 	    &s->last_displayed_line, &s->eof, view->nlines);
3050 
3051 	view_vborder(view);
3052 	return err;
3053 }
3054 
3055 static const struct got_error *
3056 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
3057     struct tog_view **focus_view, struct tog_view *view, int ch)
3058 {
3059 	const struct got_error *err = NULL, *thread_err = NULL;
3060 	struct tog_view *diff_view;
3061 	struct tog_blame_view_state *s = &view->state.blame;
3062 	int begin_x = 0;
3063 
3064 	switch (ch) {
3065 	case 'q':
3066 		s->done = 1;
3067 		break;
3068 	case 'k':
3069 	case KEY_UP:
3070 		if (s->selected_line > 1)
3071 			s->selected_line--;
3072 		else if (s->selected_line == 1 &&
3073 		    s->first_displayed_line > 1)
3074 			s->first_displayed_line--;
3075 		break;
3076 	case KEY_PPAGE:
3077 		if (s->first_displayed_line == 1) {
3078 			s->selected_line = 1;
3079 			break;
3080 		}
3081 		if (s->first_displayed_line > view->nlines - 2)
3082 			s->first_displayed_line -=
3083 			    (view->nlines - 2);
3084 		else
3085 			s->first_displayed_line = 1;
3086 		break;
3087 	case 'j':
3088 	case KEY_DOWN:
3089 		if (s->selected_line < view->nlines - 2 &&
3090 		    s->first_displayed_line +
3091 		    s->selected_line <= s->blame.nlines)
3092 			s->selected_line++;
3093 		else if (s->last_displayed_line <
3094 		    s->blame.nlines)
3095 			s->first_displayed_line++;
3096 		break;
3097 	case 'b':
3098 	case 'p': {
3099 		struct got_object_id *id = NULL;
3100 		id = get_selected_commit_id(s->blame.lines,
3101 		    s->first_displayed_line, s->selected_line);
3102 		if (id == NULL)
3103 			break;
3104 		if (ch == 'p') {
3105 			struct got_commit_object *commit;
3106 			struct got_object_qid *pid;
3107 			struct got_object_id *blob_id = NULL;
3108 			int obj_type;
3109 			err = got_object_open_as_commit(&commit,
3110 			    s->repo, id);
3111 			if (err)
3112 				break;
3113 			pid = SIMPLEQ_FIRST(
3114 			    got_object_commit_get_parent_ids(commit));
3115 			if (pid == NULL) {
3116 				got_object_commit_close(commit);
3117 				break;
3118 			}
3119 			/* Check if path history ends here. */
3120 			err = got_object_id_by_path(&blob_id, s->repo,
3121 			    pid->id, s->path);
3122 			if (err) {
3123 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
3124 					err = NULL;
3125 				got_object_commit_close(commit);
3126 				break;
3127 			}
3128 			err = got_object_get_type(&obj_type, s->repo,
3129 			    blob_id);
3130 			free(blob_id);
3131 			/* Can't blame non-blob type objects. */
3132 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
3133 				got_object_commit_close(commit);
3134 				break;
3135 			}
3136 			err = got_object_qid_alloc(&s->blamed_commit,
3137 			    pid->id);
3138 			got_object_commit_close(commit);
3139 		} else {
3140 			if (got_object_id_cmp(id,
3141 			    s->blamed_commit->id) == 0)
3142 				break;
3143 			err = got_object_qid_alloc(&s->blamed_commit,
3144 			    id);
3145 		}
3146 		if (err)
3147 			break;
3148 		s->done = 1;
3149 		thread_err = stop_blame(&s->blame);
3150 		s->done = 0;
3151 		if (thread_err)
3152 			break;
3153 		SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3154 		    s->blamed_commit, entry);
3155 		err = run_blame(&s->blame, view, &s->blame_complete,
3156 		    &s->first_displayed_line, &s->last_displayed_line,
3157 		    &s->selected_line, &s->done, &s->eof,
3158 		    s->path, s->blamed_commit->id, s->repo);
3159 		if (err)
3160 			break;
3161 		break;
3162 	}
3163 	case 'B': {
3164 		struct got_object_qid *first;
3165 		first = SIMPLEQ_FIRST(&s->blamed_commits);
3166 		if (!got_object_id_cmp(first->id, s->commit_id))
3167 			break;
3168 		s->done = 1;
3169 		thread_err = stop_blame(&s->blame);
3170 		s->done = 0;
3171 		if (thread_err)
3172 			break;
3173 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3174 		got_object_qid_free(s->blamed_commit);
3175 		s->blamed_commit =
3176 		    SIMPLEQ_FIRST(&s->blamed_commits);
3177 		err = run_blame(&s->blame, view, &s->blame_complete,
3178 		    &s->first_displayed_line, &s->last_displayed_line,
3179 		    &s->selected_line, &s->done, &s->eof, s->path,
3180 		    s->blamed_commit->id, s->repo);
3181 		if (err)
3182 			break;
3183 		break;
3184 	}
3185 	case KEY_ENTER:
3186 	case '\r': {
3187 		struct got_object_id *id = NULL;
3188 		struct got_object_qid *pid;
3189 		struct got_commit_object *commit = NULL;
3190 		id = get_selected_commit_id(s->blame.lines,
3191 		    s->first_displayed_line, s->selected_line);
3192 		if (id == NULL)
3193 			break;
3194 		err = got_object_open_as_commit(&commit, s->repo, id);
3195 		if (err)
3196 			break;
3197 		pid = SIMPLEQ_FIRST(
3198 		    got_object_commit_get_parent_ids(commit));
3199 		if (view_is_parent_view(view))
3200 		    begin_x = view_split_begin_x(view->begin_x);
3201 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3202 		if (diff_view == NULL) {
3203 			got_object_commit_close(commit);
3204 			err = got_error_from_errno("view_open");
3205 			break;
3206 		}
3207 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
3208 		    id, NULL, s->refs, s->repo);
3209 		got_object_commit_close(commit);
3210 		if (err) {
3211 			view_close(diff_view);
3212 			break;
3213 		}
3214 		if (view_is_parent_view(view)) {
3215 			err = view_close_child(view);
3216 			if (err)
3217 				break;
3218 			err = view_set_child(view, diff_view);
3219 			if (err) {
3220 				view_close(diff_view);
3221 				break;
3222 			}
3223 			*focus_view = diff_view;
3224 			view->child_focussed = 1;
3225 		} else
3226 			*new_view = diff_view;
3227 		if (err)
3228 			break;
3229 		break;
3230 	}
3231 	case KEY_NPAGE:
3232 	case ' ':
3233 		if (s->last_displayed_line >= s->blame.nlines &&
3234 		    s->selected_line >= MIN(s->blame.nlines,
3235 		    view->nlines - 2)) {
3236 			break;
3237 		}
3238 		if (s->last_displayed_line >= s->blame.nlines &&
3239 		    s->selected_line < view->nlines - 2) {
3240 			s->selected_line = MIN(s->blame.nlines,
3241 			    view->nlines - 2);
3242 			break;
3243 		}
3244 		if (s->last_displayed_line + view->nlines - 2
3245 		    <= s->blame.nlines)
3246 			s->first_displayed_line +=
3247 			    view->nlines - 2;
3248 		else
3249 			s->first_displayed_line =
3250 			    s->blame.nlines -
3251 			    (view->nlines - 3);
3252 		break;
3253 	case KEY_RESIZE:
3254 		if (s->selected_line > view->nlines - 2) {
3255 			s->selected_line = MIN(s->blame.nlines,
3256 			    view->nlines - 2);
3257 		}
3258 		break;
3259 	default:
3260 		break;
3261 	}
3262 	return thread_err ? thread_err : err;
3263 }
3264 
3265 static const struct got_error *
3266 cmd_blame(int argc, char *argv[])
3267 {
3268 	const struct got_error *error;
3269 	struct got_repository *repo = NULL;
3270 	struct got_reflist_head refs;
3271 	struct got_worktree *worktree = NULL;
3272 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3273 	struct got_object_id *commit_id = NULL;
3274 	char *commit_id_str = NULL;
3275 	int ch;
3276 	struct tog_view *view;
3277 
3278 	SIMPLEQ_INIT(&refs);
3279 
3280 #ifndef PROFILE
3281 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3282 	    NULL) == -1)
3283 		err(1, "pledge");
3284 #endif
3285 
3286 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3287 		switch (ch) {
3288 		case 'c':
3289 			commit_id_str = optarg;
3290 			break;
3291 		case 'r':
3292 			repo_path = realpath(optarg, NULL);
3293 			if (repo_path == NULL)
3294 				err(1, "-r option");
3295 			break;
3296 		default:
3297 			usage_blame();
3298 			/* NOTREACHED */
3299 		}
3300 	}
3301 
3302 	argc -= optind;
3303 	argv += optind;
3304 
3305 	if (argc == 1)
3306 		path = argv[0];
3307 	else
3308 		usage_blame();
3309 
3310 	cwd = getcwd(NULL, 0);
3311 	if (cwd == NULL) {
3312 		error = got_error_from_errno("getcwd");
3313 		goto done;
3314 	}
3315 	if (repo_path == NULL) {
3316 		error = got_worktree_open(&worktree, cwd);
3317 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3318 			goto done;
3319 		else
3320 			error = NULL;
3321 		if (worktree) {
3322 			repo_path =
3323 			    strdup(got_worktree_get_repo_path(worktree));
3324 			if (repo_path == NULL)
3325 				error = got_error_from_errno("strdup");
3326 			if (error)
3327 				goto done;
3328 		} else {
3329 			repo_path = strdup(cwd);
3330 			if (repo_path == NULL) {
3331 				error = got_error_from_errno("strdup");
3332 				goto done;
3333 			}
3334 		}
3335 	}
3336 
3337 	init_curses();
3338 
3339 	error = got_repo_open(&repo, repo_path);
3340 	if (error != NULL)
3341 		goto done;
3342 
3343 	error = apply_unveil(got_repo_get_path(repo), NULL);
3344 	if (error)
3345 		goto done;
3346 
3347 	if (worktree) {
3348 		const char *prefix = got_worktree_get_path_prefix(worktree);
3349 		char *p, *worktree_subdir = cwd +
3350 		    strlen(got_worktree_get_root_path(worktree));
3351 		if (asprintf(&p, "%s%s%s%s%s",
3352 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3353 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3354 		    path) == -1) {
3355 			error = got_error_from_errno("asprintf");
3356 			goto done;
3357 		}
3358 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3359 		free(p);
3360 	} else {
3361 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3362 	}
3363 	if (error)
3364 		goto done;
3365 
3366 	if (commit_id_str == NULL) {
3367 		struct got_reference *head_ref;
3368 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0);
3369 		if (error != NULL)
3370 			goto done;
3371 		error = got_ref_resolve(&commit_id, repo, head_ref);
3372 		got_ref_close(head_ref);
3373 	} else {
3374 		error = got_object_resolve_id_str(&commit_id, repo,
3375 		    commit_id_str);
3376 	}
3377 	if (error != NULL)
3378 		goto done;
3379 
3380 	error = got_ref_list(&refs, repo);
3381 	if (error)
3382 		goto done;
3383 
3384 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3385 	if (view == NULL) {
3386 		error = got_error_from_errno("view_open");
3387 		goto done;
3388 	}
3389 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3390 	if (error)
3391 		goto done;
3392 	error = view_loop(view);
3393 done:
3394 	free(repo_path);
3395 	free(cwd);
3396 	free(commit_id);
3397 	if (worktree)
3398 		got_worktree_close(worktree);
3399 	if (repo)
3400 		got_repo_close(repo);
3401 	got_ref_list_free(&refs);
3402 	return error;
3403 }
3404 
3405 static const struct got_error *
3406 draw_tree_entries(struct tog_view *view,
3407     struct got_tree_entry **first_displayed_entry,
3408     struct got_tree_entry **last_displayed_entry,
3409     struct got_tree_entry **selected_entry, int *ndisplayed,
3410     const char *label, int show_ids, const char *parent_path,
3411     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3412 {
3413 	const struct got_error *err = NULL;
3414 	struct got_tree_entry *te;
3415 	wchar_t *wline;
3416 	int width, n;
3417 
3418 	*ndisplayed = 0;
3419 
3420 	werase(view->window);
3421 
3422 	if (limit == 0)
3423 		return NULL;
3424 
3425 	err = format_line(&wline, &width, label, view->ncols);
3426 	if (err)
3427 		return err;
3428 	if (view_needs_focus_indication(view))
3429 		wstandout(view->window);
3430 	waddwstr(view->window, wline);
3431 	if (view_needs_focus_indication(view))
3432 		wstandend(view->window);
3433 	free(wline);
3434 	wline = NULL;
3435 	if (width < view->ncols)
3436 		waddch(view->window, '\n');
3437 	if (--limit <= 0)
3438 		return NULL;
3439 	err = format_line(&wline, &width, parent_path, view->ncols);
3440 	if (err)
3441 		return err;
3442 	waddwstr(view->window, wline);
3443 	free(wline);
3444 	wline = NULL;
3445 	if (width < view->ncols)
3446 		waddch(view->window, '\n');
3447 	if (--limit <= 0)
3448 		return NULL;
3449 	waddch(view->window, '\n');
3450 	if (--limit <= 0)
3451 		return NULL;
3452 
3453 	te = SIMPLEQ_FIRST(&entries->head);
3454 	if (*first_displayed_entry == NULL) {
3455 		if (selected == 0) {
3456 			if (view->focussed)
3457 				wstandout(view->window);
3458 			*selected_entry = NULL;
3459 		}
3460 		waddstr(view->window, "  ..\n");	/* parent directory */
3461 		if (selected == 0 && view->focussed)
3462 			wstandend(view->window);
3463 		(*ndisplayed)++;
3464 		if (--limit <= 0)
3465 			return NULL;
3466 		n = 1;
3467 	} else {
3468 		n = 0;
3469 		while (te != *first_displayed_entry)
3470 			te = SIMPLEQ_NEXT(te, entry);
3471 	}
3472 
3473 	while (te) {
3474 		char *line = NULL, *id_str = NULL;
3475 
3476 		if (show_ids) {
3477 			err = got_object_id_str(&id_str, te->id);
3478 			if (err)
3479 				return got_error_from_errno(
3480 				    "got_object_id_str");
3481 		}
3482 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3483 		    te->name, S_ISDIR(te->mode) ? "/" :
3484 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3485 			free(id_str);
3486 			return got_error_from_errno("asprintf");
3487 		}
3488 		free(id_str);
3489 		err = format_line(&wline, &width, line, view->ncols);
3490 		if (err) {
3491 			free(line);
3492 			break;
3493 		}
3494 		if (n == selected) {
3495 			if (view->focussed)
3496 				wstandout(view->window);
3497 			*selected_entry = te;
3498 		}
3499 		waddwstr(view->window, wline);
3500 		if (width < view->ncols)
3501 			waddch(view->window, '\n');
3502 		if (n == selected && view->focussed)
3503 			wstandend(view->window);
3504 		free(line);
3505 		free(wline);
3506 		wline = NULL;
3507 		n++;
3508 		(*ndisplayed)++;
3509 		*last_displayed_entry = te;
3510 		if (--limit <= 0)
3511 			break;
3512 		te = SIMPLEQ_NEXT(te, entry);
3513 	}
3514 
3515 	return err;
3516 }
3517 
3518 static void
3519 tree_scroll_up(struct tog_view *view,
3520     struct got_tree_entry **first_displayed_entry, int maxscroll,
3521     const struct got_tree_entries *entries, int isroot)
3522 {
3523 	struct got_tree_entry *te, *prev;
3524 	int i;
3525 
3526 	if (*first_displayed_entry == NULL)
3527 		return;
3528 
3529 	te = SIMPLEQ_FIRST(&entries->head);
3530 	if (*first_displayed_entry == te) {
3531 		if (!isroot)
3532 			*first_displayed_entry = NULL;
3533 		return;
3534 	}
3535 
3536 	/* XXX this is stupid... switch to TAILQ? */
3537 	for (i = 0; i < maxscroll; i++) {
3538 		while (te != *first_displayed_entry) {
3539 			prev = te;
3540 			te = SIMPLEQ_NEXT(te, entry);
3541 		}
3542 		*first_displayed_entry = prev;
3543 		te = SIMPLEQ_FIRST(&entries->head);
3544 	}
3545 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3546 		*first_displayed_entry = NULL;
3547 }
3548 
3549 static int
3550 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3551 	struct got_tree_entry *last_displayed_entry,
3552 	const struct got_tree_entries *entries)
3553 {
3554 	struct got_tree_entry *next, *last;
3555 	int n = 0;
3556 
3557 	if (*first_displayed_entry)
3558 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3559 	else
3560 		next = SIMPLEQ_FIRST(&entries->head);
3561 	last = last_displayed_entry;
3562 	while (next && last && n++ < maxscroll) {
3563 		last = SIMPLEQ_NEXT(last, entry);
3564 		if (last) {
3565 			*first_displayed_entry = next;
3566 			next = SIMPLEQ_NEXT(next, entry);
3567 		}
3568 	}
3569 	return n;
3570 }
3571 
3572 static const struct got_error *
3573 tree_entry_path(char **path, struct tog_parent_trees *parents,
3574     struct got_tree_entry *te)
3575 {
3576 	const struct got_error *err = NULL;
3577 	struct tog_parent_tree *pt;
3578 	size_t len = 2; /* for leading slash and NUL */
3579 
3580 	TAILQ_FOREACH(pt, parents, entry)
3581 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3582 	if (te)
3583 		len += strlen(te->name);
3584 
3585 	*path = calloc(1, len);
3586 	if (path == NULL)
3587 		return got_error_from_errno("calloc");
3588 
3589 	(*path)[0] = '/';
3590 	pt = TAILQ_LAST(parents, tog_parent_trees);
3591 	while (pt) {
3592 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3593 			err = got_error(GOT_ERR_NO_SPACE);
3594 			goto done;
3595 		}
3596 		if (strlcat(*path, "/", len) >= len) {
3597 			err = got_error(GOT_ERR_NO_SPACE);
3598 			goto done;
3599 		}
3600 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3601 	}
3602 	if (te) {
3603 		if (strlcat(*path, te->name, len) >= len) {
3604 			err = got_error(GOT_ERR_NO_SPACE);
3605 			goto done;
3606 		}
3607 	}
3608 done:
3609 	if (err) {
3610 		free(*path);
3611 		*path = NULL;
3612 	}
3613 	return err;
3614 }
3615 
3616 static const struct got_error *
3617 blame_tree_entry(struct tog_view **new_view, int begin_x,
3618     struct got_tree_entry *te, struct tog_parent_trees *parents,
3619     struct got_object_id *commit_id, struct got_reflist_head *refs,
3620     struct got_repository *repo)
3621 {
3622 	const struct got_error *err = NULL;
3623 	char *path;
3624 	struct tog_view *blame_view;
3625 
3626 	err = tree_entry_path(&path, parents, te);
3627 	if (err)
3628 		return err;
3629 
3630 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3631 	if (blame_view == NULL)
3632 		return got_error_from_errno("view_open");
3633 
3634 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3635 	if (err) {
3636 		view_close(blame_view);
3637 		free(path);
3638 	} else
3639 		*new_view = blame_view;
3640 	return err;
3641 }
3642 
3643 static const struct got_error *
3644 log_tree_entry(struct tog_view **new_view, int begin_x,
3645     struct got_tree_entry *te, struct tog_parent_trees *parents,
3646     struct got_object_id *commit_id, struct got_reflist_head *refs,
3647     struct got_repository *repo)
3648 {
3649 	struct tog_view *log_view;
3650 	const struct got_error *err = NULL;
3651 	char *path;
3652 
3653 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3654 	if (log_view == NULL)
3655 		return got_error_from_errno("view_open");
3656 
3657 	err = tree_entry_path(&path, parents, te);
3658 	if (err)
3659 		return err;
3660 
3661 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3662 	if (err)
3663 		view_close(log_view);
3664 	else
3665 		*new_view = log_view;
3666 	free(path);
3667 	return err;
3668 }
3669 
3670 static const struct got_error *
3671 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3672     struct got_object_id *commit_id, struct got_reflist_head *refs,
3673     struct got_repository *repo)
3674 {
3675 	const struct got_error *err = NULL;
3676 	char *commit_id_str = NULL;
3677 	struct tog_tree_view_state *s = &view->state.tree;
3678 
3679 	TAILQ_INIT(&s->parents);
3680 
3681 	err = got_object_id_str(&commit_id_str, commit_id);
3682 	if (err != NULL)
3683 		goto done;
3684 
3685 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3686 		err = got_error_from_errno("asprintf");
3687 		goto done;
3688 	}
3689 
3690 	s->root = s->tree = root;
3691 	s->entries = got_object_tree_get_entries(root);
3692 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3693 	s->commit_id = got_object_id_dup(commit_id);
3694 	if (s->commit_id == NULL) {
3695 		err = got_error_from_errno("got_object_id_dup");
3696 		goto done;
3697 	}
3698 	s->refs = refs;
3699 	s->repo = repo;
3700 
3701 	view->show = show_tree_view;
3702 	view->input = input_tree_view;
3703 	view->close = close_tree_view;
3704 done:
3705 	free(commit_id_str);
3706 	if (err) {
3707 		free(s->tree_label);
3708 		s->tree_label = NULL;
3709 	}
3710 	return err;
3711 }
3712 
3713 static const struct got_error *
3714 close_tree_view(struct tog_view *view)
3715 {
3716 	struct tog_tree_view_state *s = &view->state.tree;
3717 
3718 	free(s->tree_label);
3719 	s->tree_label = NULL;
3720 	free(s->commit_id);
3721 	s->commit_id = NULL;
3722 	while (!TAILQ_EMPTY(&s->parents)) {
3723 		struct tog_parent_tree *parent;
3724 		parent = TAILQ_FIRST(&s->parents);
3725 		TAILQ_REMOVE(&s->parents, parent, entry);
3726 		free(parent);
3727 
3728 	}
3729 	if (s->tree != s->root)
3730 		got_object_tree_close(s->tree);
3731 	got_object_tree_close(s->root);
3732 
3733 	return NULL;
3734 }
3735 
3736 static const struct got_error *
3737 show_tree_view(struct tog_view *view)
3738 {
3739 	const struct got_error *err = NULL;
3740 	struct tog_tree_view_state *s = &view->state.tree;
3741 	char *parent_path;
3742 
3743 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3744 	if (err)
3745 		return err;
3746 
3747 	err = draw_tree_entries(view, &s->first_displayed_entry,
3748 	    &s->last_displayed_entry, &s->selected_entry,
3749 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3750 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3751 	free(parent_path);
3752 
3753 	view_vborder(view);
3754 	return err;
3755 }
3756 
3757 static const struct got_error *
3758 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3759     struct tog_view **focus_view, struct tog_view *view, int ch)
3760 {
3761 	const struct got_error *err = NULL;
3762 	struct tog_tree_view_state *s = &view->state.tree;
3763 	struct tog_view *log_view;
3764 	int begin_x = 0, nscrolled;
3765 
3766 	switch (ch) {
3767 	case 'i':
3768 		s->show_ids = !s->show_ids;
3769 		break;
3770 	case 'l':
3771 		if (!s->selected_entry)
3772 			break;
3773 		if (view_is_parent_view(view))
3774 			begin_x = view_split_begin_x(view->begin_x);
3775 		err = log_tree_entry(&log_view, begin_x,
3776 		    s->selected_entry, &s->parents,
3777 		    s->commit_id, s->refs, s->repo);
3778 		if (view_is_parent_view(view)) {
3779 			err = view_close_child(view);
3780 			if (err)
3781 				return err;
3782 			err = view_set_child(view, log_view);
3783 			if (err) {
3784 				view_close(log_view);
3785 				break;
3786 			}
3787 			*focus_view = log_view;
3788 			view->child_focussed = 1;
3789 		} else
3790 			*new_view = log_view;
3791 		break;
3792 	case 'k':
3793 	case KEY_UP:
3794 		if (s->selected > 0) {
3795 			s->selected--;
3796 			if (s->selected == 0)
3797 				break;
3798 		}
3799 		if (s->selected > 0)
3800 			break;
3801 		tree_scroll_up(view, &s->first_displayed_entry, 1,
3802 		    s->entries, s->tree == s->root);
3803 		break;
3804 	case KEY_PPAGE:
3805 		tree_scroll_up(view, &s->first_displayed_entry,
3806 		    MAX(0, view->nlines - 4 - s->selected), s->entries,
3807 		    s->tree == s->root);
3808 		s->selected = 0;
3809 		if (SIMPLEQ_FIRST(&s->entries->head) ==
3810 		    s->first_displayed_entry && s->tree != s->root)
3811 			s->first_displayed_entry = NULL;
3812 		break;
3813 	case 'j':
3814 	case KEY_DOWN:
3815 		if (s->selected < s->ndisplayed - 1) {
3816 			s->selected++;
3817 			break;
3818 		}
3819 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry) == NULL)
3820 			/* can't scroll any further */
3821 			break;
3822 		tree_scroll_down(&s->first_displayed_entry, 1,
3823 		    s->last_displayed_entry, s->entries);
3824 		break;
3825 	case KEY_NPAGE:
3826 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3827 		    == NULL) {
3828 			/* can't scroll any further; move cursor down */
3829 			if (s->selected < s->ndisplayed - 1)
3830 				s->selected = s->ndisplayed - 1;
3831 			break;
3832 		}
3833 		nscrolled = tree_scroll_down(&s->first_displayed_entry,
3834 		    view->nlines, s->last_displayed_entry, s->entries);
3835 		if (nscrolled < view->nlines) {
3836 			int ndisplayed = 0;
3837 			struct got_tree_entry *te;
3838 			te = s->first_displayed_entry;
3839 			do {
3840 				ndisplayed++;
3841 				te = SIMPLEQ_NEXT(te, entry);
3842 			} while (te);
3843 			s->selected = ndisplayed - 1;
3844 		}
3845 		break;
3846 	case KEY_ENTER:
3847 	case '\r':
3848 	case KEY_BACKSPACE:
3849 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
3850 			struct tog_parent_tree *parent;
3851 			/* user selected '..' */
3852 			if (s->tree == s->root)
3853 				break;
3854 			parent = TAILQ_FIRST(&s->parents);
3855 			TAILQ_REMOVE(&s->parents, parent,
3856 			    entry);
3857 			got_object_tree_close(s->tree);
3858 			s->tree = parent->tree;
3859 			s->entries =
3860 			    got_object_tree_get_entries(s->tree);
3861 			s->first_displayed_entry =
3862 			    parent->first_displayed_entry;
3863 			s->selected_entry =
3864 			    parent->selected_entry;
3865 			s->selected = parent->selected;
3866 			free(parent);
3867 		} else if (S_ISDIR(s->selected_entry->mode)) {
3868 			struct got_tree_object *subtree;
3869 			err = got_object_open_as_tree(&subtree,
3870 			    s->repo, s->selected_entry->id);
3871 			if (err)
3872 				break;
3873 			err = tree_view_visit_subtree(subtree, s);
3874 			if (err) {
3875 				got_object_tree_close(subtree);
3876 				break;
3877 			}
3878 		} else if (S_ISREG(s->selected_entry->mode)) {
3879 			struct tog_view *blame_view;
3880 			int begin_x = view_is_parent_view(view) ?
3881 			    view_split_begin_x(view->begin_x) : 0;
3882 
3883 			err = blame_tree_entry(&blame_view, begin_x,
3884 			    s->selected_entry, &s->parents,
3885 			    s->commit_id, s->refs, s->repo);
3886 			if (err)
3887 				break;
3888 			if (view_is_parent_view(view)) {
3889 				err = view_close_child(view);
3890 				if (err)
3891 					return err;
3892 				err = view_set_child(view, blame_view);
3893 				if (err) {
3894 					view_close(blame_view);
3895 					break;
3896 				}
3897 				*focus_view = blame_view;
3898 				view->child_focussed = 1;
3899 			} else
3900 				*new_view = blame_view;
3901 		}
3902 		break;
3903 	case KEY_RESIZE:
3904 		if (s->selected > view->nlines)
3905 			s->selected = s->ndisplayed - 1;
3906 		break;
3907 	default:
3908 		break;
3909 	}
3910 
3911 	return err;
3912 }
3913 
3914 __dead static void
3915 usage_tree(void)
3916 {
3917 	endwin();
3918 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3919 	    getprogname());
3920 	exit(1);
3921 }
3922 
3923 static const struct got_error *
3924 cmd_tree(int argc, char *argv[])
3925 {
3926 	const struct got_error *error;
3927 	struct got_repository *repo = NULL;
3928 	struct got_reflist_head refs;
3929 	char *repo_path = NULL;
3930 	struct got_object_id *commit_id = NULL;
3931 	char *commit_id_arg = NULL;
3932 	struct got_commit_object *commit = NULL;
3933 	struct got_tree_object *tree = NULL;
3934 	int ch;
3935 	struct tog_view *view;
3936 
3937 	SIMPLEQ_INIT(&refs);
3938 
3939 #ifndef PROFILE
3940 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3941 	    NULL) == -1)
3942 		err(1, "pledge");
3943 #endif
3944 
3945 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3946 		switch (ch) {
3947 		case 'c':
3948 			commit_id_arg = optarg;
3949 			break;
3950 		default:
3951 			usage_tree();
3952 			/* NOTREACHED */
3953 		}
3954 	}
3955 
3956 	argc -= optind;
3957 	argv += optind;
3958 
3959 	if (argc == 0) {
3960 		struct got_worktree *worktree;
3961 		char *cwd = getcwd(NULL, 0);
3962 		if (cwd == NULL)
3963 			return got_error_from_errno("getcwd");
3964 		error = got_worktree_open(&worktree, cwd);
3965 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3966 			goto done;
3967 		if (worktree) {
3968 			free(cwd);
3969 			repo_path =
3970 			    strdup(got_worktree_get_repo_path(worktree));
3971 			got_worktree_close(worktree);
3972 		} else
3973 			repo_path = cwd;
3974 		if (repo_path == NULL) {
3975 			error = got_error_from_errno("strdup");
3976 			goto done;
3977 		}
3978 	} else if (argc == 1) {
3979 		repo_path = realpath(argv[0], NULL);
3980 		if (repo_path == NULL)
3981 			return got_error_from_errno2("realpath", argv[0]);
3982 	} else
3983 		usage_log();
3984 
3985 	init_curses();
3986 
3987 	error = got_repo_open(&repo, repo_path);
3988 	if (error != NULL)
3989 		goto done;
3990 
3991 	error = apply_unveil(got_repo_get_path(repo), NULL);
3992 	if (error)
3993 		goto done;
3994 
3995 	if (commit_id_arg == NULL)
3996 		error = get_head_commit_id(&commit_id, GOT_REF_HEAD, repo);
3997 	else
3998 		error = got_object_resolve_id_str(&commit_id, repo,
3999 		    commit_id_arg);
4000 	if (error != NULL)
4001 		goto done;
4002 
4003 	error = got_object_open_as_commit(&commit, repo, commit_id);
4004 	if (error != NULL)
4005 		goto done;
4006 
4007 	error = got_object_open_as_tree(&tree, repo,
4008 	    got_object_commit_get_tree_id(commit));
4009 	if (error != NULL)
4010 		goto done;
4011 
4012 	error = got_ref_list(&refs, repo);
4013 	if (error)
4014 		goto done;
4015 
4016 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
4017 	if (view == NULL) {
4018 		error = got_error_from_errno("view_open");
4019 		goto done;
4020 	}
4021 	error = open_tree_view(view, tree, commit_id, &refs, repo);
4022 	if (error)
4023 		goto done;
4024 	error = view_loop(view);
4025 done:
4026 	free(repo_path);
4027 	free(commit_id);
4028 	if (commit)
4029 		got_object_commit_close(commit);
4030 	if (tree)
4031 		got_object_tree_close(tree);
4032 	if (repo)
4033 		got_repo_close(repo);
4034 	got_ref_list_free(&refs);
4035 	return error;
4036 }
4037 
4038 __dead static void
4039 usage(void)
4040 {
4041 	int i;
4042 
4043 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
4044 	    "Available commands:\n", getprogname());
4045 	for (i = 0; i < nitems(tog_commands); i++) {
4046 		struct tog_cmd *cmd = &tog_commands[i];
4047 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
4048 	}
4049 	exit(1);
4050 }
4051 
4052 static char **
4053 make_argv(const char *arg0, const char *arg1)
4054 {
4055 	char **argv;
4056 	int argc = (arg1 == NULL ? 1 : 2);
4057 
4058 	argv = calloc(argc, sizeof(char *));
4059 	if (argv == NULL)
4060 		err(1, "calloc");
4061 	argv[0] = strdup(arg0);
4062 	if (argv[0] == NULL)
4063 		err(1, "calloc");
4064 	if (arg1) {
4065 		argv[1] = strdup(arg1);
4066 		if (argv[1] == NULL)
4067 			err(1, "calloc");
4068 	}
4069 
4070 	return argv;
4071 }
4072 
4073 int
4074 main(int argc, char *argv[])
4075 {
4076 	const struct got_error *error = NULL;
4077 	struct tog_cmd *cmd = NULL;
4078 	int ch, hflag = 0;
4079 	char **cmd_argv = NULL;
4080 
4081 	setlocale(LC_CTYPE, "");
4082 
4083 	while ((ch = getopt(argc, argv, "h")) != -1) {
4084 		switch (ch) {
4085 		case 'h':
4086 			hflag = 1;
4087 			break;
4088 		default:
4089 			usage();
4090 			/* NOTREACHED */
4091 		}
4092 	}
4093 
4094 	argc -= optind;
4095 	argv += optind;
4096 	optind = 0;
4097 	optreset = 1;
4098 
4099 	if (argc == 0) {
4100 		if (hflag)
4101 			usage();
4102 		/* Build an argument vector which runs a default command. */
4103 		cmd = &tog_commands[0];
4104 		cmd_argv = make_argv(cmd->name, NULL);
4105 		argc = 1;
4106 	} else {
4107 		int i;
4108 
4109 		/* Did the user specific a command? */
4110 		for (i = 0; i < nitems(tog_commands); i++) {
4111 			if (strncmp(tog_commands[i].name, argv[0],
4112 			    strlen(argv[0])) == 0) {
4113 				cmd = &tog_commands[i];
4114 				if (hflag)
4115 					tog_commands[i].cmd_usage();
4116 				break;
4117 			}
4118 		}
4119 		if (cmd == NULL) {
4120 			/* Did the user specify a repository? */
4121 			char *repo_path = realpath(argv[0], NULL);
4122 			if (repo_path) {
4123 				struct got_repository *repo;
4124 				error = got_repo_open(&repo, repo_path);
4125 				if (error == NULL)
4126 					got_repo_close(repo);
4127 			} else
4128 				error = got_error_from_errno2("realpath",
4129 				    argv[0]);
4130 			if (error) {
4131 				if (hflag) {
4132 					fprintf(stderr, "%s: '%s' is not a "
4133 					    "known command\n", getprogname(),
4134 					    argv[0]);
4135 					usage();
4136 				}
4137 				fprintf(stderr, "%s: '%s' is neither a known "
4138 				    "command nor a path to a repository\n",
4139 				    getprogname(), argv[0]);
4140 				free(repo_path);
4141 				return 1;
4142 			}
4143 			cmd = &tog_commands[0];
4144 			cmd_argv = make_argv(cmd->name, repo_path);
4145 			argc = 2;
4146 			free(repo_path);
4147 		}
4148 	}
4149 
4150 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4151 	if (error)
4152 		goto done;
4153 done:
4154 	endwin();
4155 	free(cmd_argv);
4156 	if (error)
4157 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4158 	return 0;
4159 }