1 /*
2  * Copyright (c) 2018 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 
20 #include <errno.h>
21 #define _XOPEN_SOURCE_EXTENDED
22 #include <curses.h>
23 #undef _XOPEN_SOURCE_EXTENDED
24 #include <panel.h>
25 #include <locale.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <getopt.h>
29 #include <string.h>
30 #include <err.h>
31 #include <unistd.h>
32 #include <util.h>
33 #include <limits.h>
34 #include <wchar.h>
35 #include <time.h>
36 #include <pthread.h>
37 
38 #include "got_error.h"
39 #include "got_object.h"
40 #include "got_reference.h"
41 #include "got_repository.h"
42 #include "got_diff.h"
43 #include "got_opentemp.h"
44 #include "got_commit_graph.h"
45 #include "got_utf8.h"
46 #include "got_blame.h"
47 
48 #ifndef MIN
49 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
50 #endif
51 
52 #ifndef nitems
53 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
54 #endif
55 
56 struct tog_cmd {
57 	const char *name;
58 	const struct got_error *(*cmd_main)(int, char *[]);
59 	void (*cmd_usage)(void);
60 	const char *descr;
61 };
62 
63 __dead static void	usage(void);
64 __dead static void	usage_log(void);
65 __dead static void	usage_diff(void);
66 __dead static void	usage_blame(void);
67 __dead static void	usage_tree(void);
68 
69 static const struct got_error*	cmd_log(int, char *[]);
70 static const struct got_error*	cmd_diff(int, char *[]);
71 static const struct got_error*	cmd_blame(int, char *[]);
72 static const struct got_error*	cmd_tree(int, char *[]);
73 
74 static struct tog_cmd tog_commands[] = {
75 	{ "log",	cmd_log,	usage_log,
76 	    "show repository history" },
77 	{ "diff",	cmd_diff,	usage_diff,
78 	    "compare files and directories" },
79 	{ "blame",	cmd_blame,	usage_blame,
80 	    "show line-by-line file history" },
81 	{ "tree",	cmd_tree,	usage_tree,
82 	    "browse trees in repository" },
83 };
84 
85 static struct tog_view {
86 	WINDOW *window;
87 	PANEL *panel;
88 } tog_log_view, tog_diff_view, tog_blame_view, tog_tree_view;
89 
90 static const struct got_error *
91 show_diff_view(struct got_object *, struct got_object *,
92     struct got_repository *);
93 static const struct got_error *
94 show_log_view(struct got_object_id *, struct got_repository *);
95 static const struct got_error *
96 show_blame_view(const char *, struct got_object_id *, struct got_repository *);
97 static const struct got_error *
98 show_tree_view(struct got_tree_object *, struct got_object_id *,
99     struct got_repository *);
100 
101 __dead static void
102 usage_log(void)
103 {
104 	endwin();
105 	fprintf(stderr, "usage: %s log [-c commit] [repository-path]\n",
106 	    getprogname());
107 	exit(1);
108 }
109 
110 /* Create newly allocated wide-character string equivalent to a byte string. */
111 static const struct got_error *
112 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
113 {
114 	char *vis = NULL;
115 	const struct got_error *err = NULL;
116 
117 	*ws = NULL;
118 	*wlen = mbstowcs(NULL, s, 0);
119 	if (*wlen == (size_t)-1) {
120 		int vislen;
121 		if (errno != EILSEQ)
122 			return got_error_from_errno();
123 
124 		/* byte string invalid in current encoding; try to "fix" it */
125 		err = got_mbsavis(&vis, &vislen, s);
126 		if (err)
127 			return err;
128 		*wlen = mbstowcs(NULL, vis, 0);
129 		if (*wlen == (size_t)-1) {
130 			err = got_error_from_errno(); /* give up */
131 			goto done;
132 		}
133 	}
134 
135 	*ws = calloc(*wlen + 1, sizeof(*ws));
136 	if (*ws == NULL) {
137 		err = got_error_from_errno();
138 		goto done;
139 	}
140 
141 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
142 		err = got_error_from_errno();
143 done:
144 	free(vis);
145 	if (err) {
146 		free(*ws);
147 		*ws = NULL;
148 		*wlen = 0;
149 	}
150 	return err;
151 }
152 
153 /* Format a line for display, ensuring that it won't overflow a width limit. */
154 static const struct got_error *
155 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
156 {
157 	const struct got_error *err = NULL;
158 	int cols = 0;
159 	wchar_t *wline = NULL;
160 	size_t wlen;
161 	int i;
162 
163 	*wlinep = NULL;
164 
165 	err = mbs2ws(&wline, &wlen, line);
166 	if (err)
167 		return err;
168 
169 	i = 0;
170 	while (i < wlen && cols <= wlimit) {
171 		int width = wcwidth(wline[i]);
172 		switch (width) {
173 		case 0:
174 			break;
175 		case 1:
176 		case 2:
177 			cols += width;
178 			break;
179 		case -1:
180 			if (wline[i] == L'\t')
181 				cols += TABSIZE - (cols % TABSIZE);
182 			break;
183 		default:
184 			err = got_error_from_errno();
185 			goto done;
186 		}
187 		if (cols <= COLS) {
188 			i++;
189 			if (widthp)
190 				*widthp = cols;
191 		}
192 	}
193 	wline[i] = L'\0';
194 done:
195 	if (err)
196 		free(wline);
197 	else
198 		*wlinep = wline;
199 	return err;
200 }
201 
202 static const struct got_error *
203 draw_commit(struct got_commit_object *commit, struct got_object_id *id)
204 {
205 	const struct got_error *err = NULL;
206 	char *logmsg0 = NULL, *logmsg = NULL;
207 	char *author0 = NULL, *author = NULL;
208 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
209 	int author_width, logmsg_width;
210 	char *newline, *smallerthan;
211 	char *line = NULL;
212 	char *id_str = NULL;
213 	size_t id_len;
214 	int col, limit;
215 	static const size_t id_display_cols = 8;
216 	static const size_t author_display_cols = 16;
217 	const int avail = COLS;
218 
219 	err = got_object_id_str(&id_str, id);
220 	if (err)
221 		return err;
222 	id_len = strlen(id_str);
223 	if (avail < id_display_cols) {
224 		limit = MIN(id_len, avail);
225 		waddnstr(tog_log_view.window, id_str, limit);
226 	} else {
227 		limit = MIN(id_display_cols, id_len);
228 		waddnstr(tog_log_view.window, id_str, limit);
229 	}
230 	col = limit + 1;
231 	while (col <= avail && col < id_display_cols + 2) {
232 		waddch(tog_log_view.window, ' ');
233 		col++;
234 	}
235 	if (col > avail)
236 		goto done;
237 
238 	author0 = strdup(commit->author);
239 	if (author0 == NULL) {
240 		err = got_error_from_errno();
241 		goto done;
242 	}
243 	author = author0;
244 	smallerthan = strchr(author, '<');
245 	if (smallerthan)
246 		*smallerthan = '\0';
247 	else {
248 		char *at = strchr(author, '@');
249 		if (at)
250 			*at = '\0';
251 	}
252 	limit = MIN(avail, author_display_cols);
253 	err = format_line(&wauthor, &author_width, author, limit);
254 	if (err)
255 		goto done;
256 	waddwstr(tog_log_view.window, wauthor);
257 	col += author_width;
258 	while (col <= avail && author_width < author_display_cols + 1) {
259 		waddch(tog_log_view.window, ' ');
260 		col++;
261 		author_width++;
262 	}
263 	if (col > avail)
264 		goto done;
265 
266 	logmsg0 = strdup(commit->logmsg);
267 	if (logmsg0 == NULL) {
268 		err = got_error_from_errno();
269 		goto done;
270 	}
271 	logmsg = logmsg0;
272 	while (*logmsg == '\n')
273 		logmsg++;
274 	newline = strchr(logmsg, '\n');
275 	if (newline)
276 		*newline = '\0';
277 	limit = avail - col;
278 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
279 	if (err)
280 		goto done;
281 	waddwstr(tog_log_view.window, wlogmsg);
282 	col += logmsg_width;
283 	while (col <= avail) {
284 		waddch(tog_log_view.window, ' ');
285 		col++;
286 	}
287 done:
288 	free(logmsg0);
289 	free(wlogmsg);
290 	free(author0);
291 	free(wauthor);
292 	free(line);
293 	free(id_str);
294 	return err;
295 }
296 
297 struct commit_queue_entry {
298 	TAILQ_ENTRY(commit_queue_entry) entry;
299 	struct got_object_id *id;
300 	struct got_commit_object *commit;
301 };
302 TAILQ_HEAD(commit_queue, commit_queue_entry);
303 
304 static struct commit_queue_entry *
305 alloc_commit_queue_entry(struct got_commit_object *commit,
306     struct got_object_id *id)
307 {
308 	struct commit_queue_entry *entry;
309 
310 	entry = calloc(1, sizeof(*entry));
311 	if (entry == NULL)
312 		return NULL;
313 
314 	entry->id = id;
315 	entry->commit = commit;
316 	return entry;
317 }
318 
319 static void
320 pop_commit(struct commit_queue *commits)
321 {
322 	struct commit_queue_entry *entry;
323 
324 	entry = TAILQ_FIRST(commits);
325 	TAILQ_REMOVE(commits, entry, entry);
326 	got_object_commit_close(entry->commit);
327 	/* Don't free entry->id! It is owned by the commit graph. */
328 	free(entry);
329 }
330 
331 static void
332 free_commits(struct commit_queue *commits)
333 {
334 	while (!TAILQ_EMPTY(commits))
335 		pop_commit(commits);
336 }
337 
338 static const struct got_error *
339 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
340     struct got_object_id *start_id, struct got_repository *repo)
341 {
342 	const struct got_error *err = NULL;
343 	struct got_object_id *id;
344 	struct commit_queue_entry *entry;
345 
346 	err = got_commit_graph_iter_start(graph, start_id);
347 	if (err)
348 		return err;
349 
350 	entry = TAILQ_LAST(commits, commit_queue);
351 	if (entry && got_object_id_cmp(entry->id, start_id) == 0) {
352 		int nfetched;
353 
354 		/* Start ID's commit is already on the queue; skip over it. */
355 		err = got_commit_graph_iter_next(&id, graph);
356 		if (err && err->code != GOT_ERR_ITER_NEED_MORE)
357 			return err;
358 
359 		err = got_commit_graph_fetch_commits(&nfetched, graph, 1, repo);
360 		if (err)
361 			return err;
362 	}
363 
364 	while (1) {
365 		struct got_commit_object *commit;
366 
367 		err = got_commit_graph_iter_next(&id, graph);
368 		if (err) {
369 			if (err->code == GOT_ERR_ITER_NEED_MORE)
370 				err = NULL;
371 			break;
372 		}
373 
374 		err = got_object_open_as_commit(&commit, repo, id);
375 		if (err)
376 			break;
377 
378 		entry = alloc_commit_queue_entry(commit, id);
379 		if (entry == NULL) {
380 			err = got_error_from_errno();
381 			break;
382 		}
383 
384 		TAILQ_INSERT_TAIL(commits, entry, entry);
385 	}
386 
387 	return err;
388 }
389 
390 static const struct got_error *
391 fetch_next_commit(struct commit_queue_entry **pentry,
392     struct commit_queue_entry *entry, struct commit_queue *commits,
393     struct got_commit_graph *graph, struct got_repository *repo)
394 {
395 	const struct got_error *err = NULL;
396 	struct got_object_qid *qid;
397 
398 	*pentry = NULL;
399 
400 	/* Populate commit graph with entry's parent commits. */
401 	SIMPLEQ_FOREACH(qid, &entry->commit->parent_ids, entry) {
402 		int nfetched;
403 		err = got_commit_graph_fetch_commits_up_to(&nfetched,
404 			graph, qid->id, repo);
405 		if (err)
406 			return err;
407 	}
408 
409 	/* Append outstanding commits to queue in graph sort order. */
410 	err = queue_commits(graph, commits, entry->id, repo);
411 	if (err) {
412 		if (err->code == GOT_ERR_ITER_COMPLETED)
413 			err = NULL;
414 		return err;
415 	}
416 
417 	/* Next entry to display should now be available. */
418 	*pentry = TAILQ_NEXT(entry, entry);
419 	if (*pentry == NULL)
420 		return got_error(GOT_ERR_NO_OBJ);
421 
422 	return NULL;
423 }
424 
425 static const struct got_error *
426 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
427 {
428 	const struct got_error *err = NULL;
429 	struct got_reference *head_ref;
430 
431 	*head_id = NULL;
432 
433 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
434 	if (err)
435 		return err;
436 
437 	err = got_ref_resolve(head_id, repo, head_ref);
438 	got_ref_close(head_ref);
439 	if (err) {
440 		*head_id = NULL;
441 		return err;
442 	}
443 
444 	return NULL;
445 }
446 
447 static const struct got_error *
448 draw_commits(struct commit_queue_entry **last, struct commit_queue_entry **selected,
449     struct commit_queue_entry *first, int selected_idx, int limit)
450 {
451 	const struct got_error *err = NULL;
452 	struct commit_queue_entry *entry;
453 	int ncommits = 0;
454 
455 	werase(tog_log_view.window);
456 
457 	entry = first;
458 	*last = first;
459 	while (entry) {
460 		if (ncommits == limit)
461 			break;
462 		if (ncommits == selected_idx) {
463 			wstandout(tog_log_view.window);
464 			*selected = entry;
465 		}
466 		err = draw_commit(entry->commit, entry->id);
467 		if (ncommits == selected_idx)
468 			wstandend(tog_log_view.window);
469 		if (err)
470 			break;
471 		ncommits++;
472 		*last = entry;
473 		entry = TAILQ_NEXT(entry, entry);
474 	}
475 
476 	update_panels();
477 	doupdate();
478 
479 	return err;
480 }
481 
482 static void
483 scroll_up(struct commit_queue_entry **first_displayed_entry, int maxscroll,
484     struct commit_queue *commits)
485 {
486 	struct commit_queue_entry *entry;
487 	int nscrolled = 0;
488 
489 	entry = TAILQ_FIRST(commits);
490 	if (*first_displayed_entry == entry)
491 		return;
492 
493 	entry = *first_displayed_entry;
494 	while (entry && nscrolled < maxscroll) {
495 		entry = TAILQ_PREV(entry, commit_queue, entry);
496 		if (entry) {
497 			*first_displayed_entry = entry;
498 			nscrolled++;
499 		}
500 	}
501 }
502 
503 static const struct got_error *
504 scroll_down(struct commit_queue_entry **first_displayed_entry, int maxscroll,
505     struct commit_queue_entry *last_displayed_entry,
506     struct commit_queue *commits, struct got_commit_graph *graph,
507     struct got_repository *repo)
508 {
509 	const struct got_error *err = NULL;
510 	struct commit_queue_entry *pentry;
511 	int nscrolled = 0;
512 
513 	do {
514 		pentry = TAILQ_NEXT(last_displayed_entry, entry);
515 		if (pentry == NULL) {
516 			err = fetch_next_commit(&pentry, last_displayed_entry,
517 			    commits, graph, repo);
518 			if (err || pentry == NULL)
519 				break;
520 		}
521 		last_displayed_entry = pentry;
522 
523 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
524 		if (pentry == NULL)
525 			break;
526 		*first_displayed_entry = pentry;
527 	} while (++nscrolled < maxscroll);
528 
529 	return err;
530 }
531 
532 static int
533 num_parents(struct commit_queue_entry *entry)
534 {
535 	int nparents = 0;
536 
537 	while (entry) {
538 		entry = TAILQ_NEXT(entry, entry);
539 		nparents++;
540 	}
541 
542 	return nparents;
543 }
544 
545 static const struct got_error *
546 show_commit(struct commit_queue_entry *entry, struct got_repository *repo)
547 {
548 	const struct got_error *err;
549 	struct got_object *obj1 = NULL, *obj2 = NULL;
550 	struct got_object_qid *parent_id;
551 
552 	err = got_object_open(&obj2, repo, entry->id);
553 	if (err)
554 		return err;
555 
556 	parent_id = SIMPLEQ_FIRST(&entry->commit->parent_ids);
557 	if (parent_id) {
558 		err = got_object_open(&obj1, repo, parent_id->id);
559 		if (err)
560 			goto done;
561 	}
562 
563 	err = show_diff_view(obj1, obj2, repo);
564 done:
565 	if (obj1)
566 		got_object_close(obj1);
567 	if (obj2)
568 		got_object_close(obj2);
569 	return err;
570 }
571 
572 static const struct got_error *
573 browse_commit(struct commit_queue_entry *entry, struct got_repository *repo)
574 {
575 	const struct got_error *err = NULL;
576 	struct got_tree_object *tree;
577 
578 	err = got_object_open_as_tree(&tree, repo, entry->commit->tree_id);
579 	if (err)
580 		return err;
581 
582 	err = show_tree_view(tree, entry->id, repo);
583 	got_object_tree_close(tree);
584 	return err;
585 }
586 
587 static const struct got_error *
588 show_log_view(struct got_object_id *start_id, struct got_repository *repo)
589 {
590 	const struct got_error *err = NULL;
591 	struct got_object_id *head_id = NULL;
592 	int ch, done = 0, selected = 0, nparents, nfetched;
593 	struct got_commit_graph *graph;
594 	struct commit_queue commits;
595 	struct commit_queue_entry *entry = NULL;
596 	struct commit_queue_entry *first_displayed_entry = NULL;
597 	struct commit_queue_entry *last_displayed_entry = NULL;
598 	struct commit_queue_entry *selected_entry = NULL;
599 
600 	if (tog_log_view.window == NULL) {
601 		tog_log_view.window = newwin(0, 0, 0, 0);
602 		if (tog_log_view.window == NULL)
603 			return got_error_from_errno();
604 		keypad(tog_log_view.window, TRUE);
605 	}
606 	if (tog_log_view.panel == NULL) {
607 		tog_log_view.panel = new_panel(tog_log_view.window);
608 		if (tog_log_view.panel == NULL)
609 			return got_error_from_errno();
610 	} else
611 		show_panel(tog_log_view.panel);
612 
613 	err = get_head_commit_id(&head_id, repo);
614 	if (err)
615 		return err;
616 
617 	TAILQ_INIT(&commits);
618 
619 	err = got_commit_graph_open(&graph, head_id, 0, repo);
620 	if (err)
621 		goto done;
622 
623 	/* Populate commit graph with a sufficient number of commits. */
624 	err = got_commit_graph_fetch_commits_up_to(&nfetched, graph, start_id,
625 	    repo);
626 	if (err)
627 		goto done;
628 	err = got_commit_graph_fetch_commits(&nfetched, graph, LINES, repo);
629 	if (err)
630 		goto done;
631 
632 	/*
633 	 * Open the initial batch of commits, sorted in commit graph order.
634 	 * We keep all commits open throughout the lifetime of the log view
635 	 * in order to avoid having to re-fetch commits from disk while
636 	 * updating the display.
637 	 */
638 	err = queue_commits(graph, &commits, head_id, repo);
639 	if (err && err->code != GOT_ERR_ITER_COMPLETED)
640 		goto done;
641 
642 	/* Find entry corresponding to the first commit to display. */
643 	TAILQ_FOREACH(entry, &commits, entry) {
644 		if (got_object_id_cmp(entry->id, start_id) == 0) {
645 			first_displayed_entry = entry;
646 			break;
647 		}
648 	}
649 	if (first_displayed_entry == NULL) {
650 		err = got_error(GOT_ERR_NO_OBJ);
651 		goto done;
652 	}
653 
654 	while (!done) {
655 		err = draw_commits(&last_displayed_entry, &selected_entry,
656 		    first_displayed_entry, selected, LINES);
657 		if (err)
658 			goto done;
659 
660 		nodelay(stdscr, FALSE);
661 		ch = wgetch(tog_log_view.window);
662 		nodelay(stdscr, TRUE);
663 		switch (ch) {
664 			case ERR:
665 				if (errno) {
666 					err = got_error_from_errno();
667 					goto done;
668 				}
669 				break;
670 			case 'q':
671 				done = 1;
672 				break;
673 			case 'k':
674 			case KEY_UP:
675 				if (selected > 0)
676 					selected--;
677 				if (selected > 0)
678 					break;
679 				scroll_up(&first_displayed_entry, 1, &commits);
680 				break;
681 			case KEY_PPAGE:
682 				if (TAILQ_FIRST(&commits) ==
683 				    first_displayed_entry) {
684 					selected = 0;
685 					break;
686 				}
687 				scroll_up(&first_displayed_entry, LINES,
688 				    &commits);
689 				break;
690 			case 'j':
691 			case KEY_DOWN:
692 				nparents = num_parents(first_displayed_entry);
693 				if (selected < LINES - 1 &&
694 				    selected < nparents - 1) {
695 					selected++;
696 					break;
697 				}
698 				err = scroll_down(&first_displayed_entry, 1,
699 				    last_displayed_entry, &commits, graph,
700 				    repo);
701 				if (err)
702 					goto done;
703 				break;
704 			case KEY_NPAGE:
705 				err = scroll_down(&first_displayed_entry, LINES,
706 				    last_displayed_entry, &commits, graph,
707 				    repo);
708 				if (err)
709 					goto done;
710 				if (last_displayed_entry->commit->nparents > 0)
711 					break;
712 				/* can't scroll any further; move cursor down */
713 				nparents = num_parents(first_displayed_entry);
714 				if (selected < LINES - 1 ||
715 				    selected < nparents - 1)
716 					selected = MIN(LINES - 1, nparents - 1);
717 				break;
718 			case KEY_RESIZE:
719 				if (selected > LINES)
720 					selected = LINES - 1;
721 				break;
722 			case KEY_ENTER:
723 			case '\r':
724 				err = show_commit(selected_entry, repo);
725 				if (err)
726 					goto done;
727 				show_panel(tog_log_view.panel);
728 				break;
729 			case 't':
730 				err = browse_commit(selected_entry, repo);
731 				if (err)
732 					goto done;
733 				show_panel(tog_log_view.panel);
734 				break;
735 			default:
736 				break;
737 		}
738 	}
739 done:
740 	free(head_id);
741 	if (graph)
742 		got_commit_graph_close(graph);
743 	free_commits(&commits);
744 	return err;
745 }
746 
747 static const struct got_error *
748 cmd_log(int argc, char *argv[])
749 {
750 	const struct got_error *error;
751 	struct got_repository *repo;
752 	struct got_object_id *start_id = NULL;
753 	char *repo_path = NULL;
754 	char *start_commit = NULL;
755 	int ch;
756 
757 #ifndef PROFILE
758 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
759 		err(1, "pledge");
760 #endif
761 
762 	while ((ch = getopt(argc, argv, "c:")) != -1) {
763 		switch (ch) {
764 		case 'c':
765 			start_commit = optarg;
766 			break;
767 		default:
768 			usage();
769 			/* NOTREACHED */
770 		}
771 	}
772 
773 	argc -= optind;
774 	argv += optind;
775 
776 	if (argc == 0) {
777 		repo_path = getcwd(NULL, 0);
778 		if (repo_path == NULL)
779 			return got_error_from_errno();
780 	} else if (argc == 1) {
781 		repo_path = realpath(argv[0], NULL);
782 		if (repo_path == NULL)
783 			return got_error_from_errno();
784 	} else
785 		usage_log();
786 
787 	error = got_repo_open(&repo, repo_path);
788 	free(repo_path);
789 	if (error != NULL)
790 		return error;
791 
792 	if (start_commit == NULL) {
793 		error = get_head_commit_id(&start_id, repo);
794 		if (error != NULL)
795 			return error;
796 	} else {
797 		struct got_object *obj;
798 		error = got_object_open_by_id_str(&obj, repo, start_commit);
799 		if (error == NULL) {
800 			start_id = got_object_get_id(obj);
801 			if (start_id == NULL)
802 				error = got_error_from_errno();
803 		}
804 	}
805 	if (error != NULL)
806 		return error;
807 	error = show_log_view(start_id, repo);
808 	free(start_id);
809 	got_repo_close(repo);
810 	return error;
811 }
812 
813 __dead static void
814 usage_diff(void)
815 {
816 	endwin();
817 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
818 	    getprogname());
819 	exit(1);
820 }
821 
822 static char *
823 parse_next_line(FILE *f, size_t *len)
824 {
825 	char *line;
826 	size_t linelen;
827 	size_t lineno;
828 	const char delim[3] = { '\0', '\0', '\0'};
829 
830 	line = fparseln(f, &linelen, &lineno, delim, 0);
831 	if (len)
832 		*len = linelen;
833 	return line;
834 }
835 
836 static const struct got_error *
837 draw_file(WINDOW *window, FILE *f, int *first_displayed_line,
838     int *last_displayed_line, int *eof, int max_lines)
839 {
840 	const struct got_error *err;
841 	int nlines = 0, nprinted = 0;
842 	char *line;
843 	size_t len;
844 	wchar_t *wline;
845 	int width;
846 
847 	rewind(f);
848 	werase(window);
849 
850 	*eof = 0;
851 	while (nprinted < max_lines) {
852 		line = parse_next_line(f, &len);
853 		if (line == NULL) {
854 			*eof = 1;
855 			break;
856 		}
857 		if (++nlines < *first_displayed_line) {
858 			free(line);
859 			continue;
860 		}
861 
862 		err = format_line(&wline, &width, line, COLS);
863 		if (err) {
864 			free(line);
865 			return err;
866 		}
867 		waddwstr(window, wline);
868 		if (width < COLS)
869 			waddch(window, '\n');
870 		if (++nprinted == 1)
871 			*first_displayed_line = nlines;
872 		free(line);
873 	}
874 	*last_displayed_line = nlines;
875 
876 	update_panels();
877 	doupdate();
878 
879 	return NULL;
880 }
881 
882 static const struct got_error *
883 show_diff_view(struct got_object *obj1, struct got_object *obj2,
884     struct got_repository *repo)
885 {
886 	const struct got_error *err;
887 	FILE *f;
888 	int ch, done = 0, first_displayed_line = 1, last_displayed_line = LINES;
889 	int eof, i;
890 
891 	if (obj1 != NULL && obj2 != NULL &&
892 	    got_object_get_type(obj1) != got_object_get_type(obj2))
893 		return got_error(GOT_ERR_OBJ_TYPE);
894 
895 	f = got_opentemp();
896 	if (f == NULL)
897 		return got_error_from_errno();
898 
899 	switch (got_object_get_type(obj1 ? obj1 : obj2)) {
900 	case GOT_OBJ_TYPE_BLOB:
901 		err = got_diff_objects_as_blobs(obj1, obj2, repo, f);
902 		break;
903 	case GOT_OBJ_TYPE_TREE:
904 		err = got_diff_objects_as_trees(obj1, obj2, repo, f);
905 		break;
906 	case GOT_OBJ_TYPE_COMMIT:
907 		err = got_diff_objects_as_commits(obj1, obj2, repo, f);
908 		break;
909 	default:
910 		return got_error(GOT_ERR_OBJ_TYPE);
911 	}
912 
913 	fflush(f);
914 
915 	if (tog_diff_view.window == NULL) {
916 		tog_diff_view.window = newwin(0, 0, 0, 0);
917 		if (tog_diff_view.window == NULL)
918 			return got_error_from_errno();
919 		keypad(tog_diff_view.window, TRUE);
920 	}
921 	if (tog_diff_view.panel == NULL) {
922 		tog_diff_view.panel = new_panel(tog_diff_view.window);
923 		if (tog_diff_view.panel == NULL)
924 			return got_error_from_errno();
925 	} else
926 		show_panel(tog_diff_view.panel);
927 
928 	while (!done) {
929 		err = draw_file(tog_diff_view.window, f, &first_displayed_line,
930 		    &last_displayed_line, &eof, LINES);
931 		if (err)
932 			break;
933 		nodelay(stdscr, FALSE);
934 		ch = wgetch(tog_diff_view.window);
935 		nodelay(stdscr, TRUE);
936 		switch (ch) {
937 			case 'q':
938 				done = 1;
939 				break;
940 			case 'k':
941 			case KEY_UP:
942 			case KEY_BACKSPACE:
943 				if (first_displayed_line > 1)
944 					first_displayed_line--;
945 				break;
946 			case KEY_PPAGE:
947 				i = 0;
948 				while (i++ < LINES - 1 &&
949 				    first_displayed_line > 1)
950 					first_displayed_line--;
951 				break;
952 			case 'j':
953 			case KEY_DOWN:
954 			case KEY_ENTER:
955 			case '\r':
956 				if (!eof)
957 					first_displayed_line++;
958 				break;
959 			case KEY_NPAGE:
960 			case ' ':
961 				i = 0;
962 				while (!eof && i++ < LINES - 1) {
963 					char *line = parse_next_line(f, NULL);
964 					first_displayed_line++;
965 					if (line == NULL)
966 						break;
967 				}
968 				break;
969 			default:
970 				break;
971 		}
972 	}
973 	fclose(f);
974 	return err;
975 }
976 
977 static const struct got_error *
978 cmd_diff(int argc, char *argv[])
979 {
980 	const struct got_error *error = NULL;
981 	struct got_repository *repo = NULL;
982 	struct got_object *obj1 = NULL, *obj2 = NULL;
983 	char *repo_path = NULL;
984 	char *obj_id_str1 = NULL, *obj_id_str2 = NULL;
985 	int ch;
986 
987 #ifndef PROFILE
988 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
989 		err(1, "pledge");
990 #endif
991 
992 	while ((ch = getopt(argc, argv, "")) != -1) {
993 		switch (ch) {
994 		default:
995 			usage();
996 			/* NOTREACHED */
997 		}
998 	}
999 
1000 	argc -= optind;
1001 	argv += optind;
1002 
1003 	if (argc == 0) {
1004 		usage_diff(); /* TODO show local worktree changes */
1005 	} else if (argc == 2) {
1006 		repo_path = getcwd(NULL, 0);
1007 		if (repo_path == NULL)
1008 			return got_error_from_errno();
1009 		obj_id_str1 = argv[0];
1010 		obj_id_str2 = argv[1];
1011 	} else if (argc == 3) {
1012 		repo_path = realpath(argv[0], NULL);
1013 		if (repo_path == NULL)
1014 			return got_error_from_errno();
1015 		obj_id_str1 = argv[1];
1016 		obj_id_str2 = argv[2];
1017 	} else
1018 		usage_diff();
1019 
1020 	error = got_repo_open(&repo, repo_path);
1021 	free(repo_path);
1022 	if (error)
1023 		goto done;
1024 
1025 	error = got_object_open_by_id_str(&obj1, repo, obj_id_str1);
1026 	if (error)
1027 		goto done;
1028 
1029 	error = got_object_open_by_id_str(&obj2, repo, obj_id_str2);
1030 	if (error)
1031 		goto done;
1032 
1033 	error = show_diff_view(obj1, obj2, repo);
1034 done:
1035 	got_repo_close(repo);
1036 	if (obj1)
1037 		got_object_close(obj1);
1038 	if (obj2)
1039 		got_object_close(obj2);
1040 	return error;
1041 }
1042 
1043 __dead static void
1044 usage_blame(void)
1045 {
1046 	endwin();
1047 	fprintf(stderr, "usage: %s blame [-c commit] [repository-path] path\n",
1048 	    getprogname());
1049 	exit(1);
1050 }
1051 
1052 struct tog_blame_line {
1053 	int annotated;
1054 	struct got_object_id *id;
1055 };
1056 
1057 static const struct got_error *
1058 draw_blame(WINDOW *window, FILE *f, struct tog_blame_line *lines, int nlines,
1059     int *first_displayed_line, int *last_displayed_line, int *eof,
1060     int max_lines)
1061 {
1062 	const struct got_error *err;
1063 	int lineno = 0, nprinted = 0;
1064 	char *line;
1065 	size_t len;
1066 	wchar_t *wline;
1067 	int width;
1068 	struct tog_blame_line *blame_line;
1069 
1070 	rewind(f);
1071 	werase(window);
1072 
1073 	*eof = 0;
1074 	while (nprinted < max_lines) {
1075 		line = parse_next_line(f, &len);
1076 		if (line == NULL) {
1077 			*eof = 1;
1078 			break;
1079 		}
1080 		if (++lineno < *first_displayed_line) {
1081 			free(line);
1082 			continue;
1083 		}
1084 
1085 		err = format_line(&wline, &width, line, COLS - 9);
1086 		if (err) {
1087 			free(line);
1088 			return err;
1089 		}
1090 
1091 		blame_line = &lines[lineno - 1];
1092 		if (blame_line->annotated) {
1093 			char *id_str;
1094 			err = got_object_id_str(&id_str, blame_line->id);
1095 			if (err) {
1096 				free(line);
1097 				return err;
1098 			}
1099 			wprintw(window, "%.8s ", id_str);
1100 			free(id_str);
1101 		} else
1102 			waddstr(window, "         ");
1103 
1104 		waddwstr(window, wline);
1105 		if (width < COLS - 9)
1106 			waddch(window, '\n');
1107 		if (++nprinted == 1)
1108 			*first_displayed_line = lineno;
1109 		free(line);
1110 	}
1111 	*last_displayed_line = lineno;
1112 
1113 	update_panels();
1114 	doupdate();
1115 
1116 	return NULL;
1117 }
1118 
1119 struct tog_blame_cb_args {
1120 	pthread_mutex_t *mutex;
1121 	struct tog_blame_line *lines; /* one per line */
1122 	int nlines;
1123 
1124 	FILE *f;
1125 	WINDOW *window;
1126 	int *first_displayed_line;
1127 	int *last_displayed_line;
1128 	int *done;
1129 };
1130 
1131 static const struct got_error *
1132 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
1133 {
1134 	const struct got_error *err = NULL;
1135 	struct tog_blame_cb_args *a = arg;
1136 	struct tog_blame_line *line;
1137 	int eof;
1138 
1139 	if (*a->done)
1140 		return got_error(GOT_ERR_ITER_COMPLETED);
1141 
1142 	if (nlines != a->nlines || lineno < 1 || lineno > a->nlines)
1143 		return got_error(GOT_ERR_RANGE);
1144 
1145 	if (pthread_mutex_lock(a->mutex) != 0)
1146 		return got_error_from_errno();
1147 
1148 	line = &a->lines[lineno - 1];
1149 	line->id = got_object_id_dup(id);
1150 	if (line->id == NULL) {
1151 		err = got_error_from_errno();
1152 		goto done;
1153 	}
1154 	line->annotated = 1;
1155 
1156 	err = draw_blame(a->window, a->f, a->lines, a->nlines,
1157 	    a->first_displayed_line, a->last_displayed_line, &eof, LINES);
1158 done:
1159 	if (pthread_mutex_unlock(a->mutex) != 0)
1160 		return got_error_from_errno();
1161 	return err;
1162 }
1163 
1164 struct tog_blame_thread_args {
1165 	const char *path;
1166 	struct got_object_id *commit_id;
1167 	struct got_repository *repo;
1168 	void *blame_cb_args;
1169 };
1170 
1171 static void *
1172 blame_thread(void *arg)
1173 {
1174 	struct tog_blame_thread_args *a = arg;
1175 	return (void *)got_blame_incremental(a->path, a->commit_id, a->repo,
1176 	    blame_cb, a->blame_cb_args);
1177 }
1178 
1179 static const struct got_error *
1180 show_blame_view(const char *path, struct got_object_id *commit_id,
1181     struct got_repository *repo)
1182 {
1183 	const struct got_error *err = NULL;
1184 	int ch, done = 0, first_displayed_line = 1, last_displayed_line = LINES;
1185 	int eof, i;
1186 	struct got_object *obj = NULL;
1187 	struct got_blob_object *blob = NULL;
1188 	FILE *f = NULL;
1189 	size_t filesize, nlines = 0;
1190 	struct tog_blame_line *lines = NULL;
1191 	pthread_t thread = NULL;
1192 	pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
1193 	struct tog_blame_cb_args blame_cb_args;
1194 	struct tog_blame_thread_args blame_thread_args;
1195 
1196 	err = got_object_open_by_path(&obj, repo, commit_id, path);
1197 	if (err)
1198 		goto done;
1199 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
1200 		err = got_error(GOT_ERR_OBJ_TYPE);
1201 		got_object_close(obj);
1202 		goto done;
1203 	}
1204 
1205 	err = got_object_blob_open(&blob, repo, obj, 8192);
1206 	got_object_close(obj);
1207 	if (err)
1208 		goto done;
1209 	f = got_opentemp();
1210 	if (f == NULL) {
1211 		err = got_error_from_errno();
1212 		goto done;
1213 	}
1214 	err = got_object_blob_dump_to_file(&filesize, &nlines, f, blob);
1215 	if (err)
1216 		goto done;
1217 
1218 	lines = calloc(nlines, sizeof(*lines));
1219 	if (lines == NULL) {
1220 		err = got_error_from_errno();
1221 		goto done;
1222 	}
1223 
1224 	if (tog_blame_view.window == NULL) {
1225 		tog_blame_view.window = newwin(0, 0, 0, 0);
1226 		if (tog_blame_view.window == NULL)
1227 			return got_error_from_errno();
1228 		keypad(tog_blame_view.window, TRUE);
1229 	}
1230 	if (tog_blame_view.panel == NULL) {
1231 		tog_blame_view.panel = new_panel(tog_blame_view.window);
1232 		if (tog_blame_view.panel == NULL)
1233 			return got_error_from_errno();
1234 	} else
1235 		show_panel(tog_blame_view.panel);
1236 
1237 	if (pthread_mutex_init(&mutex, NULL) != 0) {
1238 		err = got_error_from_errno();
1239 		goto done;
1240 	}
1241 	blame_cb_args.lines = lines;
1242 	blame_cb_args.nlines = nlines;
1243 	blame_cb_args.mutex = &mutex;
1244 	blame_cb_args.f = f;
1245 	blame_cb_args.window = tog_blame_view.window;
1246 	blame_cb_args.first_displayed_line = &first_displayed_line;
1247 	blame_cb_args.last_displayed_line = &last_displayed_line;
1248 	blame_cb_args.done = &done;
1249 
1250 	blame_thread_args.path = path;
1251 	blame_thread_args.commit_id = commit_id;
1252 	blame_thread_args.repo = repo;
1253 	blame_thread_args.blame_cb_args = &blame_cb_args;
1254 
1255 	if (pthread_create(&thread, NULL, blame_thread,
1256 	    &blame_thread_args) != 0) {
1257 		err = got_error_from_errno();
1258 		goto done;
1259 	}
1260 
1261 	while (!done) {
1262 		if (pthread_mutex_lock(&mutex) != 0) {
1263 			err = got_error_from_errno();
1264 			goto done;
1265 		}
1266 		err = draw_blame(tog_blame_view.window, f, lines, nlines,
1267 		    &first_displayed_line, &last_displayed_line, &eof, LINES);
1268 		if (pthread_mutex_unlock(&mutex) != 0) {
1269 			err = got_error_from_errno();
1270 			goto done;
1271 		}
1272 		if (err)
1273 			break;
1274 		nodelay(stdscr, FALSE);
1275 		ch = wgetch(tog_blame_view.window);
1276 		nodelay(stdscr, TRUE);
1277 		if (pthread_mutex_lock(&mutex) != 0) {
1278 			err = got_error_from_errno();
1279 			goto done;
1280 		}
1281 		switch (ch) {
1282 			case 'q':
1283 				done = 1;
1284 				break;
1285 			case 'k':
1286 			case KEY_UP:
1287 			case KEY_BACKSPACE:
1288 				if (first_displayed_line > 1)
1289 					first_displayed_line--;
1290 				break;
1291 			case KEY_PPAGE:
1292 				i = 0;
1293 				while (i++ < LINES - 1 &&
1294 				    first_displayed_line > 1)
1295 					first_displayed_line--;
1296 				break;
1297 			case 'j':
1298 			case KEY_DOWN:
1299 			case KEY_ENTER:
1300 			case '\r':
1301 				if (!eof)
1302 					first_displayed_line++;
1303 				break;
1304 			case KEY_NPAGE:
1305 			case ' ':
1306 				i = 0;
1307 				while (!eof && i++ < LINES - 1) {
1308 					char *line = parse_next_line(f, NULL);
1309 					first_displayed_line++;
1310 					if (line == NULL)
1311 						break;
1312 				}
1313 				break;
1314 			default:
1315 				break;
1316 		}
1317 		if (pthread_mutex_unlock(&mutex) != 0) {
1318 			err = got_error_from_errno();
1319 			goto done;
1320 		}
1321 	}
1322 done:
1323 	if (thread) {
1324 		if (pthread_join(thread, (void **)&err) != 0)
1325 			err = got_error_from_errno();
1326 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
1327 			err = NULL;
1328 	}
1329 	if (blob)
1330 		got_object_blob_close(blob);
1331 	if (f)
1332 		fclose(f);
1333 	for (i = 0; i < nlines; i++)
1334 		free(lines[i].id);
1335 	free(lines);
1336 	return err;
1337 }
1338 
1339 static const struct got_error *
1340 cmd_blame(int argc, char *argv[])
1341 {
1342 	const struct got_error *error;
1343 	struct got_repository *repo = NULL;
1344 	char *repo_path = NULL;
1345 	char *path = NULL;
1346 	struct got_object_id *commit_id = NULL;
1347 	char *commit_id_str = NULL;
1348 	int ch;
1349 
1350 #ifndef PROFILE
1351 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
1352 		err(1, "pledge");
1353 #endif
1354 
1355 	while ((ch = getopt(argc, argv, "c:")) != -1) {
1356 		switch (ch) {
1357 		case 'c':
1358 			commit_id_str = optarg;
1359 			break;
1360 		default:
1361 			usage();
1362 			/* NOTREACHED */
1363 		}
1364 	}
1365 
1366 	argc -= optind;
1367 	argv += optind;
1368 
1369 	if (argc == 0) {
1370 		usage_blame();
1371 	} else if (argc == 1) {
1372 		repo_path = getcwd(NULL, 0);
1373 		if (repo_path == NULL)
1374 			return got_error_from_errno();
1375 		path = argv[0];
1376 	} else if (argc == 2) {
1377 		repo_path = realpath(argv[0], NULL);
1378 		if (repo_path == NULL)
1379 			return got_error_from_errno();
1380 		path = argv[1];
1381 	} else
1382 		usage_blame();
1383 
1384 	error = got_repo_open(&repo, repo_path);
1385 	free(repo_path);
1386 	if (error != NULL)
1387 		return error;
1388 
1389 	if (commit_id_str == NULL) {
1390 		struct got_reference *head_ref;
1391 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1392 		if (error != NULL)
1393 			goto done;
1394 		error = got_ref_resolve(&commit_id, repo, head_ref);
1395 		got_ref_close(head_ref);
1396 	} else {
1397 		struct got_object *obj;
1398 		error = got_object_open_by_id_str(&obj, repo, commit_id_str);
1399 		if (error != NULL)
1400 			goto done;
1401 		commit_id = got_object_get_id(obj);
1402 		if (commit_id == NULL)
1403 			error = got_error_from_errno();
1404 		got_object_close(obj);
1405 	}
1406 	if (error != NULL)
1407 		goto done;
1408 
1409 	error = show_blame_view(path, commit_id, repo);
1410 done:
1411 	free(commit_id);
1412 	if (repo)
1413 		got_repo_close(repo);
1414 	return error;
1415 }
1416 
1417 static const struct got_error *
1418 draw_tree_entries(struct got_tree_entry **first_displayed_entry,
1419     struct got_tree_entry **last_displayed_entry,
1420     struct got_tree_entry **selected_entry, int *ndisplayed,
1421     WINDOW *window, const char *label, const char *parent_path,
1422     const struct got_tree_entries *entries, int selected, int limit, int isroot)
1423 {
1424 	const struct got_error *err = NULL;
1425 	struct got_tree_entry *te;
1426 	wchar_t *wline;
1427 	int width, n;
1428 
1429 	*ndisplayed = 0;
1430 
1431 	werase(window);
1432 
1433 	if (limit == 0)
1434 		return NULL;
1435 
1436 	err = format_line(&wline, &width, label, COLS);
1437 	if (err)
1438 		return err;
1439 	waddwstr(window, wline);
1440 	if (width < COLS)
1441 		waddch(window, '\n');
1442 	if (--limit <= 0)
1443 		return NULL;
1444 	err = format_line(&wline, &width, parent_path, COLS);
1445 	if (err)
1446 		return err;
1447 	waddwstr(window, wline);
1448 	if (width < COLS)
1449 		waddch(window, '\n');
1450 	if (--limit <= 0)
1451 		return NULL;
1452 	waddch(window, '\n');
1453 	if (--limit <= 0)
1454 		return NULL;
1455 
1456 	te = SIMPLEQ_FIRST(&entries->head);
1457 	if (*first_displayed_entry == NULL) {
1458 		if (selected == 0) {
1459 			wstandout(window);
1460 			*selected_entry = NULL;
1461 		}
1462 		waddstr(window, "  ..\n");	/* parent directory */
1463 		if (selected == 0)
1464 			wstandend(window);
1465 		(*ndisplayed)++;
1466 		if (--limit <= 0)
1467 			return NULL;
1468 		n = 1;
1469 	} else {
1470 		n = 0;
1471 		while (te != *first_displayed_entry)
1472 			te = SIMPLEQ_NEXT(te, entry);
1473 	}
1474 
1475 	while (te) {
1476 		char *line = NULL;
1477 		if (asprintf(&line, "  %s%s",
1478 		    te->name, S_ISDIR(te->mode) ? "/" : "") == -1)
1479 			return got_error_from_errno();
1480 		err = format_line(&wline, &width, line, COLS);
1481 		if (err) {
1482 			free(line);
1483 			break;
1484 		}
1485 		if (n == selected) {
1486 			wstandout(window);
1487 			*selected_entry = te;
1488 		}
1489 		waddwstr(window, wline);
1490 		if (width < COLS)
1491 			waddch(window, '\n');
1492 		if (n == selected)
1493 			wstandend(window);
1494 		free(line);
1495 		n++;
1496 		(*ndisplayed)++;
1497 		*last_displayed_entry = te;
1498 		if (--limit <= 0)
1499 			break;
1500 		te = SIMPLEQ_NEXT(te, entry);
1501 	}
1502 
1503 	return err;
1504 }
1505 
1506 static void
1507 tree_scroll_up(struct got_tree_entry **first_displayed_entry, int maxscroll,
1508     const struct got_tree_entries *entries, int isroot)
1509 {
1510 	struct got_tree_entry *te, *prev;
1511 	int i;
1512 
1513 	if (*first_displayed_entry == NULL)
1514 		return;
1515 
1516 	te = SIMPLEQ_FIRST(&entries->head);
1517 	if (*first_displayed_entry == te) {
1518 		if (!isroot)
1519 			*first_displayed_entry = NULL;
1520 		return;
1521 	}
1522 
1523 	/* XXX this is stupid... switch to TAILQ? */
1524 	for (i = 0; i < maxscroll; i++) {
1525 		while (te != *first_displayed_entry) {
1526 			prev = te;
1527 			te = SIMPLEQ_NEXT(te, entry);
1528 		}
1529 		*first_displayed_entry = prev;
1530 		te = SIMPLEQ_FIRST(&entries->head);
1531 	}
1532 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
1533 		*first_displayed_entry = NULL;
1534 }
1535 
1536 static void
1537 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
1538 	struct got_tree_entry *last_displayed_entry,
1539 	const struct got_tree_entries *entries)
1540 {
1541 	struct got_tree_entry *next;
1542 	int n = 0;
1543 
1544 	if (SIMPLEQ_NEXT(last_displayed_entry, entry) == NULL)
1545 		return;
1546 
1547 	if (*first_displayed_entry)
1548 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
1549 	else
1550 		next = SIMPLEQ_FIRST(&entries->head);
1551 	while (next) {
1552 		*first_displayed_entry = next;
1553 		if (++n >= maxscroll)
1554 			break;
1555 		next = SIMPLEQ_NEXT(next, entry);
1556 	}
1557 }
1558 
1559 struct tog_parent_tree {
1560 	TAILQ_ENTRY(tog_parent_tree) entry;
1561 	struct got_tree_object *tree;
1562 	struct got_tree_entry *first_displayed_entry;
1563 	struct got_tree_entry *selected_entry;
1564 	int selected;
1565 };
1566 
1567 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
1568 
1569 static const struct got_error *
1570 tree_entry_path(char **path, struct tog_parent_trees *parents,
1571     struct got_tree_entry *te)
1572 {
1573 	const struct got_error *err = NULL;
1574 	struct tog_parent_tree *pt;
1575 	size_t len = 2; /* for leading slash and NUL */
1576 
1577 	TAILQ_FOREACH(pt, parents, entry)
1578 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
1579 	if (te)
1580 		len += strlen(te->name);
1581 
1582 	*path = calloc(1, len);
1583 	if (path == NULL)
1584 		return got_error_from_errno();
1585 
1586 	(*path)[0] = '/';
1587 	pt = TAILQ_LAST(parents, tog_parent_trees);
1588 	while (pt) {
1589 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
1590 			err = got_error(GOT_ERR_NO_SPACE);
1591 			goto done;
1592 		}
1593 		if (strlcat(*path, "/", len) >= len) {
1594 			err = got_error(GOT_ERR_NO_SPACE);
1595 			goto done;
1596 		}
1597 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
1598 	}
1599 	if (te) {
1600 		if (strlcat(*path, te->name, len) >= len) {
1601 			err = got_error(GOT_ERR_NO_SPACE);
1602 			goto done;
1603 		}
1604 	}
1605 done:
1606 	if (err) {
1607 		free(*path);
1608 		*path = NULL;
1609 	}
1610 	return err;
1611 }
1612 
1613 static const struct got_error *
1614 blame_tree_entry(struct got_tree_entry *te, struct tog_parent_trees *parents,
1615     struct got_object_id *commit_id, struct got_repository *repo)
1616 {
1617 	const struct got_error *err = NULL;
1618 	char *path;
1619 	
1620 	err = tree_entry_path(&path, parents, te);
1621 	if (err)
1622 		return err;
1623 
1624 	err = show_blame_view(path, commit_id, repo);
1625 	free(path);
1626 	return err;
1627 }
1628 
1629 static const struct got_error *
1630 show_tree_view(struct got_tree_object *root, struct got_object_id *commit_id,
1631     struct got_repository *repo)
1632 {
1633 	const struct got_error *err = NULL;
1634 	int ch, done = 0, selected = 0;
1635 	struct got_tree_object *tree = root;
1636 	const struct got_tree_entries *entries;
1637 	struct got_tree_entry *first_displayed_entry = NULL;
1638 	struct got_tree_entry *last_displayed_entry = NULL;
1639 	struct got_tree_entry *selected_entry = NULL;
1640 	char *commit_id_str = NULL, *tree_label = NULL;
1641 	int nentries, ndisplayed;
1642 	struct tog_parent_trees parents;
1643 
1644 	TAILQ_INIT(&parents);
1645 
1646 	err = got_object_id_str(&commit_id_str, commit_id);
1647 	if (err != NULL)
1648 		goto done;
1649 
1650 	if (asprintf(&tree_label, "tree of commit %s", commit_id_str) == -1) {
1651 		err = got_error_from_errno();
1652 		goto done;
1653 	}
1654 
1655 	if (tog_tree_view.window == NULL) {
1656 		tog_tree_view.window = newwin(0, 0, 0, 0);
1657 		if (tog_tree_view.window == NULL)
1658 			return got_error_from_errno();
1659 		keypad(tog_tree_view.window, TRUE);
1660 	}
1661 	if (tog_tree_view.panel == NULL) {
1662 		tog_tree_view.panel = new_panel(tog_tree_view.window);
1663 		if (tog_tree_view.panel == NULL)
1664 			return got_error_from_errno();
1665 	} else
1666 		show_panel(tog_tree_view.panel);
1667 
1668 	entries = got_object_tree_get_entries(root);
1669 	first_displayed_entry = SIMPLEQ_FIRST(&entries->head);
1670 	while (!done) {
1671 		char *parent_path;
1672 		entries = got_object_tree_get_entries(tree);
1673 		nentries = entries->nentries;
1674 		if (tree != root)
1675 			nentries++; /* '..' directory */
1676 
1677 		err = tree_entry_path(&parent_path, &parents, NULL);
1678 		if (err)
1679 			goto done;
1680 
1681 		err = draw_tree_entries(&first_displayed_entry,
1682 		    &last_displayed_entry, &selected_entry, &ndisplayed,
1683 		    tog_tree_view.window, tree_label, parent_path, entries,
1684 		    selected, LINES, tree == root);
1685 		free(parent_path);
1686 		if (err)
1687 			break;
1688 
1689 		nodelay(stdscr, FALSE);
1690 		ch = wgetch(tog_tree_view.window);
1691 		nodelay(stdscr, TRUE);
1692 		switch (ch) {
1693 			case 'q':
1694 				done = 1;
1695 				break;
1696 			case 'k':
1697 			case KEY_UP:
1698 				if (selected > 0)
1699 					selected--;
1700 				if (selected > 0)
1701 					break;
1702 				tree_scroll_up(&first_displayed_entry, 1,
1703 				    entries, tree == root);
1704 				break;
1705 			case KEY_PPAGE:
1706 				if (SIMPLEQ_FIRST(&entries->head) ==
1707 				    first_displayed_entry) {
1708 					if (tree != root)
1709 						first_displayed_entry = NULL;
1710 					selected = 0;
1711 					break;
1712 				}
1713 				tree_scroll_up(&first_displayed_entry, LINES,
1714 				    entries, tree == root);
1715 				break;
1716 			case 'j':
1717 			case KEY_DOWN:
1718 				if (selected < ndisplayed - 1) {
1719 					selected++;
1720 					break;
1721 				}
1722 				tree_scroll_down(&first_displayed_entry, 1,
1723 				    last_displayed_entry, entries);
1724 				break;
1725 			case KEY_NPAGE:
1726 				tree_scroll_down(&first_displayed_entry, LINES,
1727 				    last_displayed_entry, entries);
1728 				if (SIMPLEQ_NEXT(last_displayed_entry, entry))
1729 					break;
1730 				/* can't scroll any further; move cursor down */
1731 				if (selected < ndisplayed - 1)
1732 					selected = ndisplayed - 1;
1733 				break;
1734 			case KEY_ENTER:
1735 			case '\r':
1736 				if (selected_entry == NULL) {
1737 					struct tog_parent_tree *parent;
1738 			case KEY_BACKSPACE:
1739 					/* user selected '..' */
1740 					if (tree == root)
1741 						break;
1742 					parent = TAILQ_FIRST(&parents);
1743 					TAILQ_REMOVE(&parents, parent, entry);
1744 					got_object_tree_close(tree);
1745 					tree = parent->tree;
1746 					first_displayed_entry =
1747 					    parent->first_displayed_entry;
1748 					selected_entry = parent->selected_entry;
1749 					selected = parent->selected;
1750 					free(parent);
1751 				} else if (S_ISDIR(selected_entry->mode)) {
1752 					struct tog_parent_tree *parent;
1753 					struct got_tree_object *child;
1754 					err = got_object_open_as_tree(
1755 					    &child, repo, selected_entry->id);
1756 					if (err)
1757 						goto done;
1758 					parent = calloc(1, sizeof(*parent));
1759 					if (parent == NULL) {
1760 						err = got_error_from_errno();
1761 						goto done;
1762 					}
1763 					parent->tree = tree;
1764 					parent->first_displayed_entry =
1765 					   first_displayed_entry;
1766 					parent->selected_entry = selected_entry;
1767 					parent->selected = selected;
1768 					TAILQ_INSERT_HEAD(&parents, parent,
1769 					    entry);
1770 					tree = child;
1771 					selected = 0;
1772 					first_displayed_entry = NULL;
1773 				} else if (S_ISREG(selected_entry->mode)) {
1774 					err = blame_tree_entry(selected_entry,
1775 					    &parents, commit_id, repo);
1776 					if (err)
1777 						goto done;
1778 				}
1779 				break;
1780 			case KEY_RESIZE:
1781 				if (selected > LINES)
1782 					selected = ndisplayed - 1;
1783 				break;
1784 			default:
1785 				break;
1786 		}
1787 	}
1788 done:
1789 	free(tree_label);
1790 	free(commit_id_str);
1791 	while (!TAILQ_EMPTY(&parents)) {
1792 		struct tog_parent_tree *parent;
1793 		parent = TAILQ_FIRST(&parents);
1794 		TAILQ_REMOVE(&parents, parent, entry);
1795 		free(parent);
1796 
1797 	}
1798 	if (tree != root)
1799 		got_object_tree_close(tree);
1800 	return err;
1801 }
1802 
1803 __dead static void
1804 usage_tree(void)
1805 {
1806 	endwin();
1807 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
1808 	    getprogname());
1809 	exit(1);
1810 }
1811 
1812 static const struct got_error *
1813 cmd_tree(int argc, char *argv[])
1814 {
1815 	const struct got_error *error;
1816 	struct got_repository *repo = NULL;
1817 	char *repo_path = NULL;
1818 	struct got_object_id *commit_id = NULL;
1819 	char *commit_id_arg = NULL;
1820 	struct got_commit_object *commit = NULL;
1821 	struct got_tree_object *tree = NULL;
1822 	int ch;
1823 
1824 #ifndef PROFILE
1825 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
1826 		err(1, "pledge");
1827 #endif
1828 
1829 	while ((ch = getopt(argc, argv, "c:")) != -1) {
1830 		switch (ch) {
1831 		case 'c':
1832 			commit_id_arg = optarg;
1833 			break;
1834 		default:
1835 			usage();
1836 			/* NOTREACHED */
1837 		}
1838 	}
1839 
1840 	argc -= optind;
1841 	argv += optind;
1842 
1843 	if (argc == 0) {
1844 		repo_path = getcwd(NULL, 0);
1845 		if (repo_path == NULL)
1846 			return got_error_from_errno();
1847 	} else if (argc == 1) {
1848 		repo_path = realpath(argv[0], NULL);
1849 		if (repo_path == NULL)
1850 			return got_error_from_errno();
1851 	} else
1852 		usage_log();
1853 
1854 	error = got_repo_open(&repo, repo_path);
1855 	free(repo_path);
1856 	if (error != NULL)
1857 		return error;
1858 
1859 	if (commit_id_arg == NULL) {
1860 		error = get_head_commit_id(&commit_id, repo);
1861 		if (error != NULL)
1862 			goto done;
1863 	} else {
1864 		struct got_object *obj;
1865 		error = got_object_open_by_id_str(&obj, repo, commit_id_arg);
1866 		if (error == NULL) {
1867 			commit_id = got_object_get_id(obj);
1868 			if (commit_id == NULL)
1869 				error = got_error_from_errno();
1870 		}
1871 	}
1872 	if (error != NULL)
1873 		goto done;
1874 
1875 	error = got_object_open_as_commit(&commit, repo, commit_id);
1876 	if (error != NULL)
1877 		goto done;
1878 
1879 	error = got_object_open_as_tree(&tree, repo, commit->tree_id);
1880 	if (error != NULL)
1881 		goto done;
1882 
1883 	error = show_tree_view(tree, commit_id, repo);
1884 done:
1885 	free(commit_id);
1886 	if (commit)
1887 		got_object_commit_close(commit);
1888 	if (tree)
1889 		got_object_tree_close(tree);
1890 	if (repo)
1891 		got_repo_close(repo);
1892 	return error;
1893 }
1894 static void
1895 init_curses(void)
1896 {
1897 	initscr();
1898 	cbreak();
1899 	noecho();
1900 	nonl();
1901 	intrflush(stdscr, FALSE);
1902 	keypad(stdscr, TRUE);
1903 	curs_set(0);
1904 }
1905 
1906 __dead static void
1907 usage(void)
1908 {
1909 	int i;
1910 
1911 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
1912 	    "Available commands:\n", getprogname());
1913 	for (i = 0; i < nitems(tog_commands); i++) {
1914 		struct tog_cmd *cmd = &tog_commands[i];
1915 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
1916 	}
1917 	exit(1);
1918 }
1919 
1920 static char **
1921 make_argv(const char *arg0, const char *arg1)
1922 {
1923 	char **argv;
1924 	int argc = (arg1 == NULL ? 1 : 2);
1925 
1926 	argv = calloc(argc, sizeof(char *));
1927 	if (argv == NULL)
1928 		err(1, "calloc");
1929 	argv[0] = strdup(arg0);
1930 	if (argv[0] == NULL)
1931 		err(1, "calloc");
1932 	if (arg1) {
1933 		argv[1] = strdup(arg1);
1934 		if (argv[1] == NULL)
1935 			err(1, "calloc");
1936 	}
1937 
1938 	return argv;
1939 }
1940 
1941 int
1942 main(int argc, char *argv[])
1943 {
1944 	const struct got_error *error = NULL;
1945 	struct tog_cmd *cmd = NULL;
1946 	int ch, hflag = 0;
1947 	char **cmd_argv = NULL;
1948 
1949 	setlocale(LC_ALL, "");
1950 
1951 	while ((ch = getopt(argc, argv, "h")) != -1) {
1952 		switch (ch) {
1953 		case 'h':
1954 			hflag = 1;
1955 			break;
1956 		default:
1957 			usage();
1958 			/* NOTREACHED */
1959 		}
1960 	}
1961 
1962 	argc -= optind;
1963 	argv += optind;
1964 	optind = 0;
1965 	optreset = 1;
1966 
1967 	if (argc == 0) {
1968 		if (hflag)
1969 			usage();
1970 		/* Build an argument vector which runs a default command. */
1971 		cmd = &tog_commands[0];
1972 		cmd_argv = make_argv(cmd->name, NULL);
1973 		argc = 1;
1974 	} else {
1975 		int i;
1976 
1977 		/* Did the user specific a command? */
1978 		for (i = 0; i < nitems(tog_commands); i++) {
1979 			if (strncmp(tog_commands[i].name, argv[0],
1980 			    strlen(argv[0])) == 0) {
1981 				cmd = &tog_commands[i];
1982 				if (hflag)
1983 					tog_commands[i].cmd_usage();
1984 				break;
1985 			}
1986 		}
1987 		if (cmd == NULL) {
1988 			/* Did the user specify a repository? */
1989 			char *repo_path = realpath(argv[0], NULL);
1990 			if (repo_path) {
1991 				struct got_repository *repo;
1992 				error = got_repo_open(&repo, repo_path);
1993 				if (error == NULL)
1994 					got_repo_close(repo);
1995 			} else
1996 				error = got_error_from_errno();
1997 			if (error) {
1998 				if (hflag) {
1999 					fprintf(stderr, "%s: '%s' is not a "
2000 					    "known command\n", getprogname(),
2001 					    argv[0]);
2002 					usage();
2003 				}
2004 				fprintf(stderr, "%s: '%s' is neither a known "
2005 				    "command nor a path to a repository\n",
2006 				    getprogname(), argv[0]);
2007 				free(repo_path);
2008 				return 1;
2009 			}
2010 			cmd = &tog_commands[0];
2011 			cmd_argv = make_argv(cmd->name, repo_path);
2012 			argc = 2;
2013 			free(repo_path);
2014 		}
2015 	}
2016 
2017 	init_curses();
2018 
2019 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
2020 	if (error)
2021 		goto done;
2022 done:
2023 	endwin();
2024 	free(cmd_argv);
2025 	if (error)
2026 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
2027 	return 0;
2028 }