Game of Trees Repos

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Date:: Wed Jul 11 11:07:03 2018 UTC
Message:: use a separate repository structure for blame thread
Actions:: History | Blame | Raw File
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 	*widthp = 0;
165 
166 	err = mbs2ws(&wline, &wlen, line);
167 	if (err)
168 		return err;
169 
170 	i = 0;
171 	while (i < wlen && cols < wlimit) {
172 		int width = wcwidth(wline[i]);
173 		switch (width) {
174 		case 0:
175 			i++;
176 			break;
177 		case 1:
178 		case 2:
179 			if (cols + width <= wlimit) {
180 				cols += width;
181 				i++;
182 			}
183 			break;
184 		case -1:
185 			if (wline[i] == L'\t')
186 				cols += TABSIZE - ((cols + 1) % TABSIZE);
187 			i++;
188 			break;
189 		default:
190 			err = got_error_from_errno();
191 			goto done;
192 		}
193 	}
194 	wline[i] = L'\0';
195 	if (widthp)
196 		*widthp = cols;
197 done:
198 	if (err)
199 		free(wline);
200 	else
201 		*wlinep = wline;
202 	return err;
203 }
204 
205 static const struct got_error *
206 draw_commit(struct got_commit_object *commit, struct got_object_id *id)
207 {
208 	const struct got_error *err = NULL;
209 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
210 	char *logmsg0 = NULL, *logmsg = NULL;
211 	char *author0 = NULL, *author = NULL;
212 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
213 	int author_width, logmsg_width;
214 	char *newline, *smallerthan;
215 	char *line = NULL;
216 	int col, limit;
217 	static const size_t date_display_cols = 9;
218 	static const size_t author_display_cols = 16;
219 	const int avail = COLS;
220 
221 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &commit->tm_committer)
222 	    >= sizeof(datebuf))
223 		return got_error(GOT_ERR_NO_SPACE);
224 
225 	if (avail < date_display_cols)
226 		limit = MIN(sizeof(datebuf) - 1, avail);
227 	else
228 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
229 	waddnstr(tog_log_view.window, datebuf, limit);
230 	col = limit + 1;
231 	if (col > avail)
232 		goto done;
233 
234 	author0 = strdup(commit->author);
235 	if (author0 == NULL) {
236 		err = got_error_from_errno();
237 		goto done;
238 	}
239 	author = author0;
240 	smallerthan = strchr(author, '<');
241 	if (smallerthan)
242 		*smallerthan = '\0';
243 	else {
244 		char *at = strchr(author, '@');
245 		if (at)
246 			*at = '\0';
247 	}
248 	limit = avail - col;
249 	err = format_line(&wauthor, &author_width, author, limit);
250 	if (err)
251 		goto done;
252 	waddwstr(tog_log_view.window, wauthor);
253 	col += author_width;
254 	while (col <= avail && author_width < author_display_cols + 1) {
255 		waddch(tog_log_view.window, ' ');
256 		col++;
257 		author_width++;
258 	}
259 	if (col > avail)
260 		goto done;
261 
262 	logmsg0 = strdup(commit->logmsg);
263 	if (logmsg0 == NULL) {
264 		err = got_error_from_errno();
265 		goto done;
266 	}
267 	logmsg = logmsg0;
268 	while (*logmsg == '\n')
269 		logmsg++;
270 	newline = strchr(logmsg, '\n');
271 	if (newline)
272 		*newline = '\0';
273 	limit = avail - col;
274 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
275 	if (err)
276 		goto done;
277 	waddwstr(tog_log_view.window, wlogmsg);
278 	col += logmsg_width;
279 	while (col <= avail) {
280 		waddch(tog_log_view.window, ' ');
281 		col++;
282 	}
283 done:
284 	free(logmsg0);
285 	free(wlogmsg);
286 	free(author0);
287 	free(wauthor);
288 	free(line);
289 	return err;
290 }
291 
292 struct commit_queue_entry {
293 	TAILQ_ENTRY(commit_queue_entry) entry;
294 	struct got_object_id *id;
295 	struct got_commit_object *commit;
296 };
297 TAILQ_HEAD(commit_queue, commit_queue_entry);
298 
299 static struct commit_queue_entry *
300 alloc_commit_queue_entry(struct got_commit_object *commit,
301     struct got_object_id *id)
302 {
303 	struct commit_queue_entry *entry;
304 
305 	entry = calloc(1, sizeof(*entry));
306 	if (entry == NULL)
307 		return NULL;
308 
309 	entry->id = id;
310 	entry->commit = commit;
311 	return entry;
312 }
313 
314 static void
315 pop_commit(struct commit_queue *commits)
316 {
317 	struct commit_queue_entry *entry;
318 
319 	entry = TAILQ_FIRST(commits);
320 	TAILQ_REMOVE(commits, entry, entry);
321 	got_object_commit_close(entry->commit);
322 	/* Don't free entry->id! It is owned by the commit graph. */
323 	free(entry);
324 }
325 
326 static void
327 free_commits(struct commit_queue *commits)
328 {
329 	while (!TAILQ_EMPTY(commits))
330 		pop_commit(commits);
331 }
332 
333 static const struct got_error *
334 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
335     struct got_object_id *start_id, struct got_repository *repo)
336 {
337 	const struct got_error *err = NULL;
338 	struct got_object_id *id;
339 	struct commit_queue_entry *entry;
340 
341 	err = got_commit_graph_iter_start(graph, start_id);
342 	if (err)
343 		return err;
344 
345 	entry = TAILQ_LAST(commits, commit_queue);
346 	if (entry && got_object_id_cmp(entry->id, start_id) == 0) {
347 		int nfetched;
348 
349 		/* Start ID's commit is already on the queue; skip over it. */
350 		err = got_commit_graph_iter_next(&id, graph);
351 		if (err && err->code != GOT_ERR_ITER_NEED_MORE)
352 			return err;
353 
354 		err = got_commit_graph_fetch_commits(&nfetched, graph, 1, repo);
355 		if (err)
356 			return err;
357 	}
358 
359 	while (1) {
360 		struct got_commit_object *commit;
361 
362 		err = got_commit_graph_iter_next(&id, graph);
363 		if (err) {
364 			if (err->code == GOT_ERR_ITER_NEED_MORE)
365 				err = NULL;
366 			break;
367 		}
368 
369 		err = got_object_open_as_commit(&commit, repo, id);
370 		if (err)
371 			break;
372 
373 		entry = alloc_commit_queue_entry(commit, id);
374 		if (entry == NULL) {
375 			err = got_error_from_errno();
376 			break;
377 		}
378 
379 		TAILQ_INSERT_TAIL(commits, entry, entry);
380 	}
381 
382 	return err;
383 }
384 
385 static const struct got_error *
386 fetch_next_commit(struct commit_queue_entry **pentry,
387     struct commit_queue_entry *entry, struct commit_queue *commits,
388     struct got_commit_graph *graph, struct got_repository *repo)
389 {
390 	const struct got_error *err = NULL;
391 	struct got_object_qid *qid;
392 
393 	*pentry = NULL;
394 
395 	/* Populate commit graph with entry's parent commits. */
396 	SIMPLEQ_FOREACH(qid, &entry->commit->parent_ids, entry) {
397 		int nfetched;
398 		err = got_commit_graph_fetch_commits_up_to(&nfetched,
399 			graph, qid->id, repo);
400 		if (err)
401 			return err;
402 	}
403 
404 	/* Append outstanding commits to queue in graph sort order. */
405 	err = queue_commits(graph, commits, entry->id, repo);
406 	if (err) {
407 		if (err->code == GOT_ERR_ITER_COMPLETED)
408 			err = NULL;
409 		return err;
410 	}
411 
412 	/* Next entry to display should now be available. */
413 	*pentry = TAILQ_NEXT(entry, entry);
414 	if (*pentry == NULL)
415 		return got_error(GOT_ERR_NO_OBJ);
416 
417 	return NULL;
418 }
419 
420 static const struct got_error *
421 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
422 {
423 	const struct got_error *err = NULL;
424 	struct got_reference *head_ref;
425 
426 	*head_id = NULL;
427 
428 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
429 	if (err)
430 		return err;
431 
432 	err = got_ref_resolve(head_id, repo, head_ref);
433 	got_ref_close(head_ref);
434 	if (err) {
435 		*head_id = NULL;
436 		return err;
437 	}
438 
439 	return NULL;
440 }
441 
442 static const struct got_error *
443 draw_commits(struct commit_queue_entry **last, struct commit_queue_entry **selected,
444     struct commit_queue_entry *first, int selected_idx, int limit)
445 {
446 	const struct got_error *err = NULL;
447 	struct commit_queue_entry *entry;
448 	int ncommits;
449 	char *id_str, *header;
450 	size_t header_len;
451 
452 	entry = first;
453 	*selected = NULL;
454 	ncommits = 0;
455 	while (entry) {
456 		if (++ncommits - 1 == selected_idx) {
457 			*selected = entry;
458 			break;
459 		}
460 		entry = TAILQ_NEXT(entry, entry);
461 	}
462 	if (*selected == NULL)
463 		return got_error(GOT_ERR_RANGE);
464 
465 	err = got_object_id_str(&id_str, (*selected)->id);
466 	if (err)
467 		return err;
468 
469 	if (asprintf(&header, "commit: %s", id_str) == -1) {
470 		err = got_error_from_errno();
471 		free(id_str);
472 		return err;
473 	}
474 
475 	werase(tog_log_view.window);
476 
477 	header_len = strlen(header);
478 	if (header_len > COLS) {
479 		id_str[COLS + 1] = '\0';
480 		header_len = COLS;
481 	}
482 	wprintw(tog_log_view.window, header);
483 	while (header_len < COLS) {
484 		waddch(tog_log_view.window, ' ');
485 		header_len++;
486 	}
487 	free(id_str);
488 	free(header);
489 
490 	entry = first;
491 	*last = first;
492 	ncommits = 0;
493 	while (entry) {
494 		if (ncommits == limit - 1)
495 			break;
496 		if (ncommits == selected_idx) {
497 			wstandout(tog_log_view.window);
498 			*selected = entry;
499 		}
500 		err = draw_commit(entry->commit, entry->id);
501 		if (ncommits == selected_idx)
502 			wstandend(tog_log_view.window);
503 		if (err)
504 			break;
505 		ncommits++;
506 		*last = entry;
507 		entry = TAILQ_NEXT(entry, entry);
508 	}
509 
510 	update_panels();
511 	doupdate();
512 
513 	return err;
514 }
515 
516 static void
517 scroll_up(struct commit_queue_entry **first_displayed_entry, int maxscroll,
518     struct commit_queue *commits)
519 {
520 	struct commit_queue_entry *entry;
521 	int nscrolled = 0;
522 
523 	entry = TAILQ_FIRST(commits);
524 	if (*first_displayed_entry == entry)
525 		return;
526 
527 	entry = *first_displayed_entry;
528 	while (entry && nscrolled < maxscroll) {
529 		entry = TAILQ_PREV(entry, commit_queue, entry);
530 		if (entry) {
531 			*first_displayed_entry = entry;
532 			nscrolled++;
533 		}
534 	}
535 }
536 
537 static const struct got_error *
538 scroll_down(struct commit_queue_entry **first_displayed_entry, int maxscroll,
539     struct commit_queue_entry *last_displayed_entry,
540     struct commit_queue *commits, struct got_commit_graph *graph,
541     struct got_repository *repo)
542 {
543 	const struct got_error *err = NULL;
544 	struct commit_queue_entry *pentry;
545 	int nscrolled = 0;
546 
547 	do {
548 		pentry = TAILQ_NEXT(last_displayed_entry, entry);
549 		if (pentry == NULL) {
550 			err = fetch_next_commit(&pentry, last_displayed_entry,
551 			    commits, graph, repo);
552 			if (err || pentry == NULL)
553 				break;
554 		}
555 		last_displayed_entry = pentry;
556 
557 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
558 		if (pentry == NULL)
559 			break;
560 		*first_displayed_entry = pentry;
561 	} while (++nscrolled < maxscroll);
562 
563 	return err;
564 }
565 
566 static int
567 num_parents(struct commit_queue_entry *entry)
568 {
569 	int nparents = 0;
570 
571 	while (entry) {
572 		entry = TAILQ_NEXT(entry, entry);
573 		nparents++;
574 	}
575 
576 	return nparents;
577 }
578 
579 static const struct got_error *
580 show_commit(struct commit_queue_entry *entry, struct got_repository *repo)
581 {
582 	const struct got_error *err;
583 	struct got_object *obj1 = NULL, *obj2 = NULL;
584 	struct got_object_qid *parent_id;
585 
586 	err = got_object_open(&obj2, repo, entry->id);
587 	if (err)
588 		return err;
589 
590 	parent_id = SIMPLEQ_FIRST(&entry->commit->parent_ids);
591 	if (parent_id) {
592 		err = got_object_open(&obj1, repo, parent_id->id);
593 		if (err)
594 			goto done;
595 	}
596 
597 	err = show_diff_view(obj1, obj2, repo);
598 done:
599 	if (obj1)
600 		got_object_close(obj1);
601 	if (obj2)
602 		got_object_close(obj2);
603 	return err;
604 }
605 
606 static const struct got_error *
607 browse_commit(struct commit_queue_entry *entry, struct got_repository *repo)
608 {
609 	const struct got_error *err = NULL;
610 	struct got_tree_object *tree;
611 
612 	err = got_object_open_as_tree(&tree, repo, entry->commit->tree_id);
613 	if (err)
614 		return err;
615 
616 	err = show_tree_view(tree, entry->id, repo);
617 	got_object_tree_close(tree);
618 	return err;
619 }
620 
621 static const struct got_error *
622 show_log_view(struct got_object_id *start_id, struct got_repository *repo)
623 {
624 	const struct got_error *err = NULL;
625 	struct got_object_id *head_id = NULL;
626 	int ch, done = 0, selected = 0, nparents, nfetched;
627 	struct got_commit_graph *graph;
628 	struct commit_queue commits;
629 	struct commit_queue_entry *entry = NULL;
630 	struct commit_queue_entry *first_displayed_entry = NULL;
631 	struct commit_queue_entry *last_displayed_entry = NULL;
632 	struct commit_queue_entry *selected_entry = NULL;
633 
634 	if (tog_log_view.window == NULL) {
635 		tog_log_view.window = newwin(0, 0, 0, 0);
636 		if (tog_log_view.window == NULL)
637 			return got_error_from_errno();
638 		keypad(tog_log_view.window, TRUE);
639 	}
640 	if (tog_log_view.panel == NULL) {
641 		tog_log_view.panel = new_panel(tog_log_view.window);
642 		if (tog_log_view.panel == NULL)
643 			return got_error_from_errno();
644 	} else
645 		show_panel(tog_log_view.panel);
646 
647 	err = get_head_commit_id(&head_id, repo);
648 	if (err)
649 		return err;
650 
651 	TAILQ_INIT(&commits);
652 
653 	err = got_commit_graph_open(&graph, head_id, 0, repo);
654 	if (err)
655 		goto done;
656 
657 	/* Populate commit graph with a sufficient number of commits. */
658 	err = got_commit_graph_fetch_commits_up_to(&nfetched, graph, start_id,
659 	    repo);
660 	if (err)
661 		goto done;
662 	err = got_commit_graph_fetch_commits(&nfetched, graph, LINES, repo);
663 	if (err)
664 		goto done;
665 
666 	/*
667 	 * Open the initial batch of commits, sorted in commit graph order.
668 	 * We keep all commits open throughout the lifetime of the log view
669 	 * in order to avoid having to re-fetch commits from disk while
670 	 * updating the display.
671 	 */
672 	err = queue_commits(graph, &commits, head_id, repo);
673 	if (err && err->code != GOT_ERR_ITER_COMPLETED)
674 		goto done;
675 
676 	/* Find entry corresponding to the first commit to display. */
677 	TAILQ_FOREACH(entry, &commits, entry) {
678 		if (got_object_id_cmp(entry->id, start_id) == 0) {
679 			first_displayed_entry = entry;
680 			break;
681 		}
682 	}
683 	if (first_displayed_entry == NULL) {
684 		err = got_error(GOT_ERR_NO_OBJ);
685 		goto done;
686 	}
687 
688 	selected_entry = first_displayed_entry;
689 	while (!done) {
690 		err = draw_commits(&last_displayed_entry, &selected_entry,
691 		    first_displayed_entry, selected, LINES);
692 		if (err)
693 			goto done;
694 
695 		nodelay(stdscr, FALSE);
696 		ch = wgetch(tog_log_view.window);
697 		nodelay(stdscr, TRUE);
698 		switch (ch) {
699 			case ERR:
700 				if (errno) {
701 					err = got_error_from_errno();
702 					goto done;
703 				}
704 				break;
705 			case 'q':
706 				done = 1;
707 				break;
708 			case 'k':
709 			case KEY_UP:
710 				if (selected > 0)
711 					selected--;
712 				if (selected > 0)
713 					break;
714 				scroll_up(&first_displayed_entry, 1, &commits);
715 				break;
716 			case KEY_PPAGE:
717 				if (TAILQ_FIRST(&commits) ==
718 				    first_displayed_entry) {
719 					selected = 0;
720 					break;
721 				}
722 				scroll_up(&first_displayed_entry, LINES,
723 				    &commits);
724 				break;
725 			case 'j':
726 			case KEY_DOWN:
727 				nparents = num_parents(first_displayed_entry);
728 				if (selected < LINES - 2 &&
729 				    selected < nparents - 1) {
730 					selected++;
731 					break;
732 				}
733 				err = scroll_down(&first_displayed_entry, 1,
734 				    last_displayed_entry, &commits, graph,
735 				    repo);
736 				if (err)
737 					goto done;
738 				break;
739 			case KEY_NPAGE:
740 				err = scroll_down(&first_displayed_entry, LINES,
741 				    last_displayed_entry, &commits, graph,
742 				    repo);
743 				if (err)
744 					goto done;
745 				if (last_displayed_entry->commit->nparents > 0)
746 					break;
747 				/* can't scroll any further; move cursor down */
748 				nparents = num_parents(first_displayed_entry);
749 				if (selected < LINES - 2 ||
750 				    selected < nparents - 1)
751 					selected = MIN(LINES - 2, nparents - 1);
752 				break;
753 			case KEY_RESIZE:
754 				if (selected > LINES - 1)
755 					selected = LINES - 2;
756 				break;
757 			case KEY_ENTER:
758 			case '\r':
759 				err = show_commit(selected_entry, repo);
760 				if (err)
761 					goto done;
762 				show_panel(tog_log_view.panel);
763 				break;
764 			case 't':
765 				err = browse_commit(selected_entry, repo);
766 				if (err)
767 					goto done;
768 				show_panel(tog_log_view.panel);
769 				break;
770 			default:
771 				break;
772 		}
773 	}
774 done:
775 	free(head_id);
776 	if (graph)
777 		got_commit_graph_close(graph);
778 	free_commits(&commits);
779 	return err;
780 }
781 
782 static const struct got_error *
783 cmd_log(int argc, char *argv[])
784 {
785 	const struct got_error *error;
786 	struct got_repository *repo;
787 	struct got_object_id *start_id = NULL;
788 	char *repo_path = NULL;
789 	char *start_commit = NULL;
790 	int ch;
791 
792 #ifndef PROFILE
793 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
794 		err(1, "pledge");
795 #endif
796 
797 	while ((ch = getopt(argc, argv, "c:")) != -1) {
798 		switch (ch) {
799 		case 'c':
800 			start_commit = optarg;
801 			break;
802 		default:
803 			usage();
804 			/* NOTREACHED */
805 		}
806 	}
807 
808 	argc -= optind;
809 	argv += optind;
810 
811 	if (argc == 0) {
812 		repo_path = getcwd(NULL, 0);
813 		if (repo_path == NULL)
814 			return got_error_from_errno();
815 	} else if (argc == 1) {
816 		repo_path = realpath(argv[0], NULL);
817 		if (repo_path == NULL)
818 			return got_error_from_errno();
819 	} else
820 		usage_log();
821 
822 	error = got_repo_open(&repo, repo_path);
823 	free(repo_path);
824 	if (error != NULL)
825 		return error;
826 
827 	if (start_commit == NULL) {
828 		error = get_head_commit_id(&start_id, repo);
829 		if (error != NULL)
830 			return error;
831 	} else {
832 		struct got_object *obj;
833 		error = got_object_open_by_id_str(&obj, repo, start_commit);
834 		if (error == NULL) {
835 			start_id = got_object_get_id(obj);
836 			if (start_id == NULL)
837 				error = got_error_from_errno();
838 		}
839 	}
840 	if (error != NULL)
841 		return error;
842 	error = show_log_view(start_id, repo);
843 	free(start_id);
844 	got_repo_close(repo);
845 	return error;
846 }
847 
848 __dead static void
849 usage_diff(void)
850 {
851 	endwin();
852 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
853 	    getprogname());
854 	exit(1);
855 }
856 
857 static char *
858 parse_next_line(FILE *f, size_t *len)
859 {
860 	char *line;
861 	size_t linelen;
862 	size_t lineno;
863 	const char delim[3] = { '\0', '\0', '\0'};
864 
865 	line = fparseln(f, &linelen, &lineno, delim, 0);
866 	if (len)
867 		*len = linelen;
868 	return line;
869 }
870 
871 static const struct got_error *
872 draw_file(WINDOW *window, FILE *f, int *first_displayed_line,
873     int *last_displayed_line, int *eof, int max_lines)
874 {
875 	const struct got_error *err;
876 	int nlines = 0, nprinted = 0;
877 	char *line;
878 	size_t len;
879 	wchar_t *wline;
880 	int width;
881 
882 	rewind(f);
883 	werase(window);
884 
885 	*eof = 0;
886 	while (nprinted < max_lines) {
887 		line = parse_next_line(f, &len);
888 		if (line == NULL) {
889 			*eof = 1;
890 			break;
891 		}
892 		if (++nlines < *first_displayed_line) {
893 			free(line);
894 			continue;
895 		}
896 
897 		err = format_line(&wline, &width, line, COLS);
898 		if (err) {
899 			free(line);
900 			return err;
901 		}
902 		waddwstr(window, wline);
903 		if (width < COLS)
904 			waddch(window, '\n');
905 		if (++nprinted == 1)
906 			*first_displayed_line = nlines;
907 		free(line);
908 	}
909 	*last_displayed_line = nlines;
910 
911 	update_panels();
912 	doupdate();
913 
914 	return NULL;
915 }
916 
917 static const struct got_error *
918 show_diff_view(struct got_object *obj1, struct got_object *obj2,
919     struct got_repository *repo)
920 {
921 	const struct got_error *err;
922 	FILE *f;
923 	int ch, done = 0, first_displayed_line = 1, last_displayed_line = LINES;
924 	int eof, i;
925 
926 	if (obj1 != NULL && obj2 != NULL &&
927 	    got_object_get_type(obj1) != got_object_get_type(obj2))
928 		return got_error(GOT_ERR_OBJ_TYPE);
929 
930 	f = got_opentemp();
931 	if (f == NULL)
932 		return got_error_from_errno();
933 
934 	switch (got_object_get_type(obj1 ? obj1 : obj2)) {
935 	case GOT_OBJ_TYPE_BLOB:
936 		err = got_diff_objects_as_blobs(obj1, obj2, repo, f);
937 		break;
938 	case GOT_OBJ_TYPE_TREE:
939 		err = got_diff_objects_as_trees(obj1, obj2, repo, f);
940 		break;
941 	case GOT_OBJ_TYPE_COMMIT:
942 		err = got_diff_objects_as_commits(obj1, obj2, repo, f);
943 		break;
944 	default:
945 		return got_error(GOT_ERR_OBJ_TYPE);
946 	}
947 
948 	fflush(f);
949 
950 	if (tog_diff_view.window == NULL) {
951 		tog_diff_view.window = newwin(0, 0, 0, 0);
952 		if (tog_diff_view.window == NULL)
953 			return got_error_from_errno();
954 		keypad(tog_diff_view.window, TRUE);
955 	}
956 	if (tog_diff_view.panel == NULL) {
957 		tog_diff_view.panel = new_panel(tog_diff_view.window);
958 		if (tog_diff_view.panel == NULL)
959 			return got_error_from_errno();
960 	} else
961 		show_panel(tog_diff_view.panel);
962 
963 	while (!done) {
964 		err = draw_file(tog_diff_view.window, f, &first_displayed_line,
965 		    &last_displayed_line, &eof, LINES);
966 		if (err)
967 			break;
968 		nodelay(stdscr, FALSE);
969 		ch = wgetch(tog_diff_view.window);
970 		nodelay(stdscr, TRUE);
971 		switch (ch) {
972 			case 'q':
973 				done = 1;
974 				break;
975 			case 'k':
976 			case KEY_UP:
977 			case KEY_BACKSPACE:
978 				if (first_displayed_line > 1)
979 					first_displayed_line--;
980 				break;
981 			case KEY_PPAGE:
982 				i = 0;
983 				while (i++ < LINES - 1 &&
984 				    first_displayed_line > 1)
985 					first_displayed_line--;
986 				break;
987 			case 'j':
988 			case KEY_DOWN:
989 			case KEY_ENTER:
990 			case '\r':
991 				if (!eof)
992 					first_displayed_line++;
993 				break;
994 			case KEY_NPAGE:
995 			case ' ':
996 				i = 0;
997 				while (!eof && i++ < LINES - 1) {
998 					char *line = parse_next_line(f, NULL);
999 					first_displayed_line++;
1000 					if (line == NULL)
1001 						break;
1002 				}
1003 				break;
1004 			default:
1005 				break;
1006 		}
1007 	}
1008 	fclose(f);
1009 	return err;
1010 }
1011 
1012 static const struct got_error *
1013 cmd_diff(int argc, char *argv[])
1014 {
1015 	const struct got_error *error = NULL;
1016 	struct got_repository *repo = NULL;
1017 	struct got_object *obj1 = NULL, *obj2 = NULL;
1018 	char *repo_path = NULL;
1019 	char *obj_id_str1 = NULL, *obj_id_str2 = NULL;
1020 	int ch;
1021 
1022 #ifndef PROFILE
1023 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
1024 		err(1, "pledge");
1025 #endif
1026 
1027 	while ((ch = getopt(argc, argv, "")) != -1) {
1028 		switch (ch) {
1029 		default:
1030 			usage();
1031 			/* NOTREACHED */
1032 		}
1033 	}
1034 
1035 	argc -= optind;
1036 	argv += optind;
1037 
1038 	if (argc == 0) {
1039 		usage_diff(); /* TODO show local worktree changes */
1040 	} else if (argc == 2) {
1041 		repo_path = getcwd(NULL, 0);
1042 		if (repo_path == NULL)
1043 			return got_error_from_errno();
1044 		obj_id_str1 = argv[0];
1045 		obj_id_str2 = argv[1];
1046 	} else if (argc == 3) {
1047 		repo_path = realpath(argv[0], NULL);
1048 		if (repo_path == NULL)
1049 			return got_error_from_errno();
1050 		obj_id_str1 = argv[1];
1051 		obj_id_str2 = argv[2];
1052 	} else
1053 		usage_diff();
1054 
1055 	error = got_repo_open(&repo, repo_path);
1056 	free(repo_path);
1057 	if (error)
1058 		goto done;
1059 
1060 	error = got_object_open_by_id_str(&obj1, repo, obj_id_str1);
1061 	if (error)
1062 		goto done;
1063 
1064 	error = got_object_open_by_id_str(&obj2, repo, obj_id_str2);
1065 	if (error)
1066 		goto done;
1067 
1068 	error = show_diff_view(obj1, obj2, repo);
1069 done:
1070 	got_repo_close(repo);
1071 	if (obj1)
1072 		got_object_close(obj1);
1073 	if (obj2)
1074 		got_object_close(obj2);
1075 	return error;
1076 }
1077 
1078 __dead static void
1079 usage_blame(void)
1080 {
1081 	endwin();
1082 	fprintf(stderr, "usage: %s blame [-c commit] [repository-path] path\n",
1083 	    getprogname());
1084 	exit(1);
1085 }
1086 
1087 struct tog_blame_line {
1088 	int annotated;
1089 	struct got_object_id *id;
1090 };
1091 
1092 static const struct got_error *
1093 draw_blame(WINDOW *window, FILE *f, const char *path,
1094     struct tog_blame_line *lines, int nlines, int blame_complete,
1095     int selected_line, int *first_displayed_line, int *last_displayed_line,
1096     int *eof, int max_lines)
1097 {
1098 	const struct got_error *err;
1099 	int lineno = 0, nprinted = 0;
1100 	char *line;
1101 	size_t len;
1102 	wchar_t *wline;
1103 	int width, wlimit;
1104 	struct tog_blame_line *blame_line;
1105 	struct got_object_id *prev_id = NULL;
1106 
1107 	rewind(f);
1108 	werase(window);
1109 
1110 	if (asprintf(&line, "[%d-%d/%d] annotation of %s%s",
1111 	    *first_displayed_line, *last_displayed_line, nlines,
1112 	    path, blame_complete ? "" : " in progress...") == -1)
1113 		return got_error_from_errno();
1114 	err = format_line(&wline, &width, line, COLS);
1115 	free(line);
1116 	if (err)
1117 		return err;
1118 	waddwstr(window, wline);
1119 	if (width < COLS)
1120 		waddch(window, '\n');
1121 
1122 	*eof = 0;
1123 	while (nprinted < max_lines - 1) {
1124 		line = parse_next_line(f, &len);
1125 		if (line == NULL) {
1126 			*eof = 1;
1127 			break;
1128 		}
1129 		if (++lineno < *first_displayed_line) {
1130 			free(line);
1131 			continue;
1132 		}
1133 
1134 		wlimit = COLS < 9 ? 0 : COLS - 9;
1135 		err = format_line(&wline, &width, line, wlimit);
1136 		if (err) {
1137 			free(line);
1138 			return err;
1139 		}
1140 
1141 		if (nprinted == selected_line - 1)
1142 			wstandout(window);
1143 
1144 		blame_line = &lines[lineno - 1];
1145 		if (blame_line->annotated && prev_id &&
1146 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
1147 			waddstr(window, "         ");
1148 		else if (blame_line->annotated) {
1149 			char *id_str;
1150 			err = got_object_id_str(&id_str, blame_line->id);
1151 			if (err) {
1152 				free(line);
1153 				return err;
1154 			}
1155 			wprintw(window, "%.8s ", id_str);
1156 			free(id_str);
1157 			prev_id = blame_line->id;
1158 		} else {
1159 			waddstr(window, "........ ");
1160 			prev_id = NULL;
1161 		}
1162 
1163 		waddwstr(window, wline);
1164 		while (width < wlimit) {
1165 			waddch(window, ' '); /* width == wlimit - 1 ? '\n' : ' '); */
1166 			width++;
1167 		}
1168 		if (nprinted == selected_line - 1)
1169 			wstandend(window);
1170 		if (++nprinted == 1)
1171 			*first_displayed_line = lineno;
1172 		free(line);
1173 	}
1174 	*last_displayed_line = lineno;
1175 
1176 	update_panels();
1177 	doupdate();
1178 
1179 	return NULL;
1180 }
1181 
1182 struct tog_blame_cb_args {
1183 	pthread_mutex_t *mutex;
1184 	struct tog_blame_line *lines; /* one per line */
1185 	int nlines;
1186 
1187 	FILE *f;
1188 	const char *path;
1189 	WINDOW *window;
1190 	int *first_displayed_line;
1191 	int *last_displayed_line;
1192 	int *selected_line;
1193 	int *quit;
1194 };
1195 
1196 static const struct got_error *
1197 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
1198 {
1199 	const struct got_error *err = NULL;
1200 	struct tog_blame_cb_args *a = arg;
1201 	struct tog_blame_line *line;
1202 	int eof;
1203 
1204 	if (nlines != a->nlines ||
1205 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
1206 		return got_error(GOT_ERR_RANGE);
1207 
1208 	if (pthread_mutex_lock(a->mutex) != 0)
1209 		return got_error_from_errno();
1210 
1211 	if (*a->quit) {	/* user has quit the blame view */
1212 		err = got_error(GOT_ERR_ITER_COMPLETED);
1213 		goto done;
1214 	}
1215 
1216 	if (lineno == -1)
1217 		goto done; /* no change in this commit */
1218 
1219 	line = &a->lines[lineno - 1];
1220 	if (line->annotated)
1221 		goto done;
1222 
1223 	line->id = got_object_id_dup(id);
1224 	if (line->id == NULL) {
1225 		err = got_error_from_errno();
1226 		goto done;
1227 	}
1228 	line->annotated = 1;
1229 
1230 	err = draw_blame(a->window, a->f, a->path, a->lines, a->nlines, 0,
1231 	     *a->selected_line, a->first_displayed_line, a->last_displayed_line,
1232 	    &eof, LINES);
1233 done:
1234 	if (pthread_mutex_unlock(a->mutex) != 0)
1235 		return got_error_from_errno();
1236 	return err;
1237 }
1238 
1239 struct tog_blame_thread_args {
1240 	const char *path;
1241 	struct got_object_id *commit_id;
1242 	struct got_repository *repo;
1243 	void *blame_cb_args;
1244 	int *complete;
1245 };
1246 
1247 static void *
1248 blame_thread(void *arg)
1249 {
1250 	const struct got_error *err;
1251 	struct tog_blame_thread_args *ta = arg;
1252 	struct tog_blame_cb_args *a = ta->blame_cb_args;
1253 	int eof;
1254 
1255 	err = got_blame_incremental(ta->path, ta->commit_id, ta->repo,
1256 	    blame_cb, ta->blame_cb_args);
1257 	*ta->complete = 1;
1258 	if (err)
1259 		return (void *)err;
1260 
1261 	if (pthread_mutex_lock(a->mutex) != 0)
1262 		return (void *)got_error_from_errno();
1263 
1264 	err = draw_blame(a->window, a->f, a->path, a->lines, a->nlines, 1,
1265 	    *a->selected_line, a->first_displayed_line, a->last_displayed_line,
1266 	    &eof, LINES);
1267 
1268 	if (pthread_mutex_unlock(a->mutex) != 0 && err == NULL)
1269 		err = got_error_from_errno();
1270 
1271 	return (void *)err;
1272 }
1273 
1274 
1275 static const struct got_error *
1276 open_blamed_commit_and_parent(struct got_object **pobj, struct got_object **obj,
1277     struct tog_blame_line *lines, int first_displayed_line,
1278     int selected_line, struct got_repository *repo)
1279 {
1280 	const struct got_error *err = NULL;
1281 	struct tog_blame_line *line;
1282 	struct got_commit_object *commit = NULL;
1283 	struct got_object_qid *pid;
1284 
1285 	*pobj = NULL;
1286 	*obj = NULL;
1287 
1288 	line = &lines[first_displayed_line - 1 + selected_line - 1];
1289 	if (!line->annotated || line->id == NULL)
1290 		return NULL;
1291 
1292 	err = got_object_open(obj, repo, line->id);
1293 	if (err)
1294 		goto done;
1295 
1296 	err = got_object_commit_open(&commit, repo, *obj);
1297 	if (err)
1298 		goto done;
1299 
1300 	pid = SIMPLEQ_FIRST(&commit->parent_ids);
1301 	if (pid) {
1302 		err = got_object_open(pobj, repo, pid->id);
1303 		if (err)
1304 			goto done;
1305 	}
1306 done:
1307 	if (commit)
1308 		got_object_commit_close(commit);
1309 	return err;
1310 }
1311 
1312 static const struct got_error *
1313 show_blame_view(const char *path, struct got_object_id *commit_id,
1314     struct got_repository *repo)
1315 {
1316 	const struct got_error *err = NULL;
1317 	int ch, done = 0, first_displayed_line = 1, last_displayed_line = LINES;
1318 	int selected_line = first_displayed_line;
1319 	int eof, i, blame_complete = 0;
1320 	struct got_object *obj = NULL, *pobj = NULL;
1321 	struct got_blob_object *blob = NULL;
1322 	FILE *f = NULL;
1323 	size_t filesize, nlines = 0;
1324 	struct tog_blame_line *lines = NULL;
1325 	pthread_t thread = NULL;
1326 	pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
1327 	struct tog_blame_cb_args blame_cb_args;
1328 	struct tog_blame_thread_args blame_thread_args;
1329 	struct got_repository *blame_thread_repo = NULL;
1330 
1331 	err = got_object_open_by_path(&obj, repo, commit_id, path);
1332 	if (err)
1333 		goto done;
1334 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
1335 		err = got_error(GOT_ERR_OBJ_TYPE);
1336 		goto done;
1337 	}
1338 
1339 	err = got_object_blob_open(&blob, repo, obj, 8192);
1340 	if (err)
1341 		goto done;
1342 	f = got_opentemp();
1343 	if (f == NULL) {
1344 		err = got_error_from_errno();
1345 		goto done;
1346 	}
1347 	err = got_object_blob_dump_to_file(&filesize, &nlines, f, blob);
1348 	if (err)
1349 		goto done;
1350 
1351 	lines = calloc(nlines, sizeof(*lines));
1352 	if (lines == NULL) {
1353 		err = got_error_from_errno();
1354 		goto done;
1355 	}
1356 
1357 	err = got_repo_open(&blame_thread_repo, got_repo_get_path(repo));
1358 	if (err)
1359 		goto done;
1360 
1361 	if (tog_blame_view.window == NULL) {
1362 		tog_blame_view.window = newwin(0, 0, 0, 0);
1363 		if (tog_blame_view.window == NULL)
1364 			return got_error_from_errno();
1365 		keypad(tog_blame_view.window, TRUE);
1366 	}
1367 	if (tog_blame_view.panel == NULL) {
1368 		tog_blame_view.panel = new_panel(tog_blame_view.window);
1369 		if (tog_blame_view.panel == NULL)
1370 			return got_error_from_errno();
1371 	} else
1372 		show_panel(tog_blame_view.panel);
1373 
1374 	if (pthread_mutex_init(&mutex, NULL) != 0) {
1375 		err = got_error_from_errno();
1376 		goto done;
1377 	}
1378 	blame_cb_args.lines = lines;
1379 	blame_cb_args.nlines = nlines;
1380 	blame_cb_args.mutex = &mutex;
1381 	blame_cb_args.f = f;
1382 	blame_cb_args.path = path;
1383 	blame_cb_args.window = tog_blame_view.window;
1384 	blame_cb_args.first_displayed_line = &first_displayed_line;
1385 	blame_cb_args.selected_line = &selected_line;
1386 	blame_cb_args.last_displayed_line = &last_displayed_line;
1387 	blame_cb_args.quit = &done;
1388 
1389 	blame_thread_args.path = path;
1390 	blame_thread_args.commit_id = commit_id;
1391 	blame_thread_args.repo = blame_thread_repo;
1392 	blame_thread_args.blame_cb_args = &blame_cb_args;
1393 	blame_thread_args.complete = &blame_complete;
1394 
1395 	if (pthread_create(&thread, NULL, blame_thread,
1396 	    &blame_thread_args) != 0) {
1397 		err = got_error_from_errno();
1398 		goto done;
1399 	}
1400 
1401 	while (!done) {
1402 		if (pthread_mutex_lock(&mutex) != 0) {
1403 			err = got_error_from_errno();
1404 			goto done;
1405 		}
1406 		err = draw_blame(tog_blame_view.window, f, path, lines, nlines,
1407 		    blame_complete, selected_line, &first_displayed_line,
1408 		    &last_displayed_line, &eof, LINES);
1409 		if (pthread_mutex_unlock(&mutex) != 0) {
1410 			err = got_error_from_errno();
1411 			goto done;
1412 		}
1413 		if (err)
1414 			break;
1415 		nodelay(stdscr, FALSE);
1416 		ch = wgetch(tog_blame_view.window);
1417 		nodelay(stdscr, TRUE);
1418 		if (pthread_mutex_lock(&mutex) != 0) {
1419 			err = got_error_from_errno();
1420 			goto done;
1421 		}
1422 		switch (ch) {
1423 			case 'q':
1424 				done = 1;
1425 				break;
1426 			case 'k':
1427 			case KEY_UP:
1428 				if (selected_line > 1)
1429 					selected_line--;
1430 				else if (selected_line == 1 &&
1431 				    first_displayed_line > 1)
1432 					first_displayed_line--;
1433 				break;
1434 			case KEY_PPAGE:
1435 				if (first_displayed_line == 1) {
1436 					selected_line = 1;
1437 					break;
1438 				}
1439 				if (first_displayed_line > LINES - 1)
1440 					first_displayed_line -= (LINES - 1);
1441 				else
1442 					first_displayed_line = 1;
1443 				break;
1444 			case 'j':
1445 			case KEY_DOWN:
1446 				if (selected_line < LINES - 1)
1447 					selected_line++;
1448 				else if (last_displayed_line < nlines)
1449 					first_displayed_line++;
1450 				break;
1451 			case KEY_ENTER:
1452 			case '\r':
1453 				err = open_blamed_commit_and_parent(&pobj, &obj,
1454 				    lines, first_displayed_line, selected_line,
1455 				    repo);
1456 				if (err)
1457 					goto done;
1458 				if (pobj == NULL && obj == NULL)
1459 					break;
1460 				err = show_diff_view(pobj, obj, repo);
1461 				if (pobj) {
1462 					got_object_close(pobj);
1463 					pobj = NULL;
1464 				}
1465 				got_object_close(obj);
1466 				obj = NULL;
1467 				show_panel(tog_blame_view.panel);
1468 				if (err)
1469 					goto done;
1470 				break;
1471 			case KEY_NPAGE:
1472 			case ' ':
1473 				if (last_displayed_line >= nlines &&
1474 				    selected_line < LINES - 1) {
1475 					selected_line = LINES - 1;
1476 					break;
1477 				}
1478 				if (last_displayed_line + LINES - 1 <= nlines)
1479 					first_displayed_line += LINES - 1;
1480 				else
1481 					first_displayed_line =
1482 					    nlines - (LINES - 2);
1483 				break;
1484 			default:
1485 				break;
1486 		}
1487 		if (pthread_mutex_unlock(&mutex) != 0) {
1488 			err = got_error_from_errno();
1489 			goto done;
1490 		}
1491 	}
1492 done:
1493 	if (thread) {
1494 		if (pthread_join(thread, (void **)&err) != 0)
1495 			err = got_error_from_errno();
1496 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
1497 			err = NULL;
1498 	}
1499 	if (blame_thread_repo)
1500 		got_repo_close(blame_thread_repo);
1501 	if (blob)
1502 		got_object_blob_close(blob);
1503 	if (pobj)
1504 		got_object_close(pobj);
1505 	if (obj)
1506 		got_object_close(obj);
1507 	if (f)
1508 		fclose(f);
1509 	for (i = 0; i < nlines; i++)
1510 		free(lines[i].id);
1511 	free(lines);
1512 	return err;
1513 }
1514 
1515 static const struct got_error *
1516 cmd_blame(int argc, char *argv[])
1517 {
1518 	const struct got_error *error;
1519 	struct got_repository *repo = NULL;
1520 	char *repo_path = NULL;
1521 	char *path = NULL;
1522 	struct got_object_id *commit_id = NULL;
1523 	char *commit_id_str = NULL;
1524 	int ch;
1525 
1526 #ifndef PROFILE
1527 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
1528 		err(1, "pledge");
1529 #endif
1530 
1531 	while ((ch = getopt(argc, argv, "c:")) != -1) {
1532 		switch (ch) {
1533 		case 'c':
1534 			commit_id_str = optarg;
1535 			break;
1536 		default:
1537 			usage();
1538 			/* NOTREACHED */
1539 		}
1540 	}
1541 
1542 	argc -= optind;
1543 	argv += optind;
1544 
1545 	if (argc == 0) {
1546 		usage_blame();
1547 	} else if (argc == 1) {
1548 		repo_path = getcwd(NULL, 0);
1549 		if (repo_path == NULL)
1550 			return got_error_from_errno();
1551 		path = argv[0];
1552 	} else if (argc == 2) {
1553 		repo_path = realpath(argv[0], NULL);
1554 		if (repo_path == NULL)
1555 			return got_error_from_errno();
1556 		path = argv[1];
1557 	} else
1558 		usage_blame();
1559 
1560 	error = got_repo_open(&repo, repo_path);
1561 	free(repo_path);
1562 	if (error != NULL)
1563 		return error;
1564 
1565 	if (commit_id_str == NULL) {
1566 		struct got_reference *head_ref;
1567 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1568 		if (error != NULL)
1569 			goto done;
1570 		error = got_ref_resolve(&commit_id, repo, head_ref);
1571 		got_ref_close(head_ref);
1572 	} else {
1573 		struct got_object *obj;
1574 		error = got_object_open_by_id_str(&obj, repo, commit_id_str);
1575 		if (error != NULL)
1576 			goto done;
1577 		commit_id = got_object_get_id(obj);
1578 		if (commit_id == NULL)
1579 			error = got_error_from_errno();
1580 		got_object_close(obj);
1581 	}
1582 	if (error != NULL)
1583 		goto done;
1584 
1585 	error = show_blame_view(path, commit_id, repo);
1586 done:
1587 	free(commit_id);
1588 	if (repo)
1589 		got_repo_close(repo);
1590 	return error;
1591 }
1592 
1593 static const struct got_error *
1594 draw_tree_entries(struct got_tree_entry **first_displayed_entry,
1595     struct got_tree_entry **last_displayed_entry,
1596     struct got_tree_entry **selected_entry, int *ndisplayed,
1597     WINDOW *window, const char *label, const char *parent_path,
1598     const struct got_tree_entries *entries, int selected, int limit, int isroot)
1599 {
1600 	const struct got_error *err = NULL;
1601 	struct got_tree_entry *te;
1602 	wchar_t *wline;
1603 	int width, n;
1604 
1605 	*ndisplayed = 0;
1606 
1607 	werase(window);
1608 
1609 	if (limit == 0)
1610 		return NULL;
1611 
1612 	err = format_line(&wline, &width, label, COLS);
1613 	if (err)
1614 		return err;
1615 	waddwstr(window, wline);
1616 	if (width < COLS)
1617 		waddch(window, '\n');
1618 	if (--limit <= 0)
1619 		return NULL;
1620 	err = format_line(&wline, &width, parent_path, COLS);
1621 	if (err)
1622 		return err;
1623 	waddwstr(window, wline);
1624 	if (width < COLS)
1625 		waddch(window, '\n');
1626 	if (--limit <= 0)
1627 		return NULL;
1628 	waddch(window, '\n');
1629 	if (--limit <= 0)
1630 		return NULL;
1631 
1632 	te = SIMPLEQ_FIRST(&entries->head);
1633 	if (*first_displayed_entry == NULL) {
1634 		if (selected == 0) {
1635 			wstandout(window);
1636 			*selected_entry = NULL;
1637 		}
1638 		waddstr(window, "  ..\n");	/* parent directory */
1639 		if (selected == 0)
1640 			wstandend(window);
1641 		(*ndisplayed)++;
1642 		if (--limit <= 0)
1643 			return NULL;
1644 		n = 1;
1645 	} else {
1646 		n = 0;
1647 		while (te != *first_displayed_entry)
1648 			te = SIMPLEQ_NEXT(te, entry);
1649 	}
1650 
1651 	while (te) {
1652 		char *line = NULL;
1653 		if (asprintf(&line, "  %s%s",
1654 		    te->name, S_ISDIR(te->mode) ? "/" : "") == -1)
1655 			return got_error_from_errno();
1656 		err = format_line(&wline, &width, line, COLS);
1657 		if (err) {
1658 			free(line);
1659 			break;
1660 		}
1661 		if (n == selected) {
1662 			wstandout(window);
1663 			*selected_entry = te;
1664 		}
1665 		waddwstr(window, wline);
1666 		if (width < COLS)
1667 			waddch(window, '\n');
1668 		if (n == selected)
1669 			wstandend(window);
1670 		free(line);
1671 		n++;
1672 		(*ndisplayed)++;
1673 		*last_displayed_entry = te;
1674 		if (--limit <= 0)
1675 			break;
1676 		te = SIMPLEQ_NEXT(te, entry);
1677 	}
1678 
1679 	return err;
1680 }
1681 
1682 static void
1683 tree_scroll_up(struct got_tree_entry **first_displayed_entry, int maxscroll,
1684     const struct got_tree_entries *entries, int isroot)
1685 {
1686 	struct got_tree_entry *te, *prev;
1687 	int i;
1688 
1689 	if (*first_displayed_entry == NULL)
1690 		return;
1691 
1692 	te = SIMPLEQ_FIRST(&entries->head);
1693 	if (*first_displayed_entry == te) {
1694 		if (!isroot)
1695 			*first_displayed_entry = NULL;
1696 		return;
1697 	}
1698 
1699 	/* XXX this is stupid... switch to TAILQ? */
1700 	for (i = 0; i < maxscroll; i++) {
1701 		while (te != *first_displayed_entry) {
1702 			prev = te;
1703 			te = SIMPLEQ_NEXT(te, entry);
1704 		}
1705 		*first_displayed_entry = prev;
1706 		te = SIMPLEQ_FIRST(&entries->head);
1707 	}
1708 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
1709 		*first_displayed_entry = NULL;
1710 }
1711 
1712 static void
1713 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
1714 	struct got_tree_entry *last_displayed_entry,
1715 	const struct got_tree_entries *entries)
1716 {
1717 	struct got_tree_entry *next;
1718 	int n = 0;
1719 
1720 	if (SIMPLEQ_NEXT(last_displayed_entry, entry) == NULL)
1721 		return;
1722 
1723 	if (*first_displayed_entry)
1724 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
1725 	else
1726 		next = SIMPLEQ_FIRST(&entries->head);
1727 	while (next) {
1728 		*first_displayed_entry = next;
1729 		if (++n >= maxscroll)
1730 			break;
1731 		next = SIMPLEQ_NEXT(next, entry);
1732 	}
1733 }
1734 
1735 struct tog_parent_tree {
1736 	TAILQ_ENTRY(tog_parent_tree) entry;
1737 	struct got_tree_object *tree;
1738 	struct got_tree_entry *first_displayed_entry;
1739 	struct got_tree_entry *selected_entry;
1740 	int selected;
1741 };
1742 
1743 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
1744 
1745 static const struct got_error *
1746 tree_entry_path(char **path, struct tog_parent_trees *parents,
1747     struct got_tree_entry *te)
1748 {
1749 	const struct got_error *err = NULL;
1750 	struct tog_parent_tree *pt;
1751 	size_t len = 2; /* for leading slash and NUL */
1752 
1753 	TAILQ_FOREACH(pt, parents, entry)
1754 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
1755 	if (te)
1756 		len += strlen(te->name);
1757 
1758 	*path = calloc(1, len);
1759 	if (path == NULL)
1760 		return got_error_from_errno();
1761 
1762 	(*path)[0] = '/';
1763 	pt = TAILQ_LAST(parents, tog_parent_trees);
1764 	while (pt) {
1765 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
1766 			err = got_error(GOT_ERR_NO_SPACE);
1767 			goto done;
1768 		}
1769 		if (strlcat(*path, "/", len) >= len) {
1770 			err = got_error(GOT_ERR_NO_SPACE);
1771 			goto done;
1772 		}
1773 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
1774 	}
1775 	if (te) {
1776 		if (strlcat(*path, te->name, len) >= len) {
1777 			err = got_error(GOT_ERR_NO_SPACE);
1778 			goto done;
1779 		}
1780 	}
1781 done:
1782 	if (err) {
1783 		free(*path);
1784 		*path = NULL;
1785 	}
1786 	return err;
1787 }
1788 
1789 static const struct got_error *
1790 blame_tree_entry(struct got_tree_entry *te, struct tog_parent_trees *parents,
1791     struct got_object_id *commit_id, struct got_repository *repo)
1792 {
1793 	const struct got_error *err = NULL;
1794 	char *path;
1795 	
1796 	err = tree_entry_path(&path, parents, te);
1797 	if (err)
1798 		return err;
1799 
1800 	err = show_blame_view(path, commit_id, repo);
1801 	free(path);
1802 	return err;
1803 }
1804 
1805 static const struct got_error *
1806 show_tree_view(struct got_tree_object *root, struct got_object_id *commit_id,
1807     struct got_repository *repo)
1808 {
1809 	const struct got_error *err = NULL;
1810 	int ch, done = 0, selected = 0;
1811 	struct got_tree_object *tree = root;
1812 	const struct got_tree_entries *entries;
1813 	struct got_tree_entry *first_displayed_entry = NULL;
1814 	struct got_tree_entry *last_displayed_entry = NULL;
1815 	struct got_tree_entry *selected_entry = NULL;
1816 	char *commit_id_str = NULL, *tree_label = NULL;
1817 	int nentries, ndisplayed;
1818 	struct tog_parent_trees parents;
1819 
1820 	TAILQ_INIT(&parents);
1821 
1822 	err = got_object_id_str(&commit_id_str, commit_id);
1823 	if (err != NULL)
1824 		goto done;
1825 
1826 	if (asprintf(&tree_label, "tree of commit %s", commit_id_str) == -1) {
1827 		err = got_error_from_errno();
1828 		goto done;
1829 	}
1830 
1831 	if (tog_tree_view.window == NULL) {
1832 		tog_tree_view.window = newwin(0, 0, 0, 0);
1833 		if (tog_tree_view.window == NULL)
1834 			return got_error_from_errno();
1835 		keypad(tog_tree_view.window, TRUE);
1836 	}
1837 	if (tog_tree_view.panel == NULL) {
1838 		tog_tree_view.panel = new_panel(tog_tree_view.window);
1839 		if (tog_tree_view.panel == NULL)
1840 			return got_error_from_errno();
1841 	} else
1842 		show_panel(tog_tree_view.panel);
1843 
1844 	entries = got_object_tree_get_entries(root);
1845 	first_displayed_entry = SIMPLEQ_FIRST(&entries->head);
1846 	while (!done) {
1847 		char *parent_path;
1848 		entries = got_object_tree_get_entries(tree);
1849 		nentries = entries->nentries;
1850 		if (tree != root)
1851 			nentries++; /* '..' directory */
1852 
1853 		err = tree_entry_path(&parent_path, &parents, NULL);
1854 		if (err)
1855 			goto done;
1856 
1857 		err = draw_tree_entries(&first_displayed_entry,
1858 		    &last_displayed_entry, &selected_entry, &ndisplayed,
1859 		    tog_tree_view.window, tree_label, parent_path, entries,
1860 		    selected, LINES, tree == root);
1861 		free(parent_path);
1862 		if (err)
1863 			break;
1864 
1865 		nodelay(stdscr, FALSE);
1866 		ch = wgetch(tog_tree_view.window);
1867 		nodelay(stdscr, TRUE);
1868 		switch (ch) {
1869 			case 'q':
1870 				done = 1;
1871 				break;
1872 			case 'k':
1873 			case KEY_UP:
1874 				if (selected > 0)
1875 					selected--;
1876 				if (selected > 0)
1877 					break;
1878 				tree_scroll_up(&first_displayed_entry, 1,
1879 				    entries, tree == root);
1880 				break;
1881 			case KEY_PPAGE:
1882 				if (SIMPLEQ_FIRST(&entries->head) ==
1883 				    first_displayed_entry) {
1884 					if (tree != root)
1885 						first_displayed_entry = NULL;
1886 					selected = 0;
1887 					break;
1888 				}
1889 				tree_scroll_up(&first_displayed_entry, LINES,
1890 				    entries, tree == root);
1891 				break;
1892 			case 'j':
1893 			case KEY_DOWN:
1894 				if (selected < ndisplayed - 1) {
1895 					selected++;
1896 					break;
1897 				}
1898 				tree_scroll_down(&first_displayed_entry, 1,
1899 				    last_displayed_entry, entries);
1900 				break;
1901 			case KEY_NPAGE:
1902 				tree_scroll_down(&first_displayed_entry, LINES,
1903 				    last_displayed_entry, entries);
1904 				if (SIMPLEQ_NEXT(last_displayed_entry, entry))
1905 					break;
1906 				/* can't scroll any further; move cursor down */
1907 				if (selected < ndisplayed - 1)
1908 					selected = ndisplayed - 1;
1909 				break;
1910 			case KEY_ENTER:
1911 			case '\r':
1912 				if (selected_entry == NULL) {
1913 					struct tog_parent_tree *parent;
1914 			case KEY_BACKSPACE:
1915 					/* user selected '..' */
1916 					if (tree == root)
1917 						break;
1918 					parent = TAILQ_FIRST(&parents);
1919 					TAILQ_REMOVE(&parents, parent, entry);
1920 					got_object_tree_close(tree);
1921 					tree = parent->tree;
1922 					first_displayed_entry =
1923 					    parent->first_displayed_entry;
1924 					selected_entry = parent->selected_entry;
1925 					selected = parent->selected;
1926 					free(parent);
1927 				} else if (S_ISDIR(selected_entry->mode)) {
1928 					struct tog_parent_tree *parent;
1929 					struct got_tree_object *child;
1930 					err = got_object_open_as_tree(
1931 					    &child, repo, selected_entry->id);
1932 					if (err)
1933 						goto done;
1934 					parent = calloc(1, sizeof(*parent));
1935 					if (parent == NULL) {
1936 						err = got_error_from_errno();
1937 						goto done;
1938 					}
1939 					parent->tree = tree;
1940 					parent->first_displayed_entry =
1941 					   first_displayed_entry;
1942 					parent->selected_entry = selected_entry;
1943 					parent->selected = selected;
1944 					TAILQ_INSERT_HEAD(&parents, parent,
1945 					    entry);
1946 					tree = child;
1947 					selected = 0;
1948 					first_displayed_entry = NULL;
1949 				} else if (S_ISREG(selected_entry->mode)) {
1950 					err = blame_tree_entry(selected_entry,
1951 					    &parents, commit_id, repo);
1952 					if (err)
1953 						goto done;
1954 				}
1955 				break;
1956 			case KEY_RESIZE:
1957 				if (selected > LINES)
1958 					selected = ndisplayed - 1;
1959 				break;
1960 			default:
1961 				break;
1962 		}
1963 	}
1964 done:
1965 	free(tree_label);
1966 	free(commit_id_str);
1967 	while (!TAILQ_EMPTY(&parents)) {
1968 		struct tog_parent_tree *parent;
1969 		parent = TAILQ_FIRST(&parents);
1970 		TAILQ_REMOVE(&parents, parent, entry);
1971 		free(parent);
1972 
1973 	}
1974 	if (tree != root)
1975 		got_object_tree_close(tree);
1976 	return err;
1977 }
1978 
1979 __dead static void
1980 usage_tree(void)
1981 {
1982 	endwin();
1983 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
1984 	    getprogname());
1985 	exit(1);
1986 }
1987 
1988 static const struct got_error *
1989 cmd_tree(int argc, char *argv[])
1990 {
1991 	const struct got_error *error;
1992 	struct got_repository *repo = NULL;
1993 	char *repo_path = NULL;
1994 	struct got_object_id *commit_id = NULL;
1995 	char *commit_id_arg = NULL;
1996 	struct got_commit_object *commit = NULL;
1997 	struct got_tree_object *tree = NULL;
1998 	int ch;
1999 
2000 #ifndef PROFILE
2001 	if (pledge("stdio rpath wpath cpath flock proc tty", NULL) == -1)
2002 		err(1, "pledge");
2003 #endif
2004 
2005 	while ((ch = getopt(argc, argv, "c:")) != -1) {
2006 		switch (ch) {
2007 		case 'c':
2008 			commit_id_arg = optarg;
2009 			break;
2010 		default:
2011 			usage();
2012 			/* NOTREACHED */
2013 		}
2014 	}
2015 
2016 	argc -= optind;
2017 	argv += optind;
2018 
2019 	if (argc == 0) {
2020 		repo_path = getcwd(NULL, 0);
2021 		if (repo_path == NULL)
2022 			return got_error_from_errno();
2023 	} else if (argc == 1) {
2024 		repo_path = realpath(argv[0], NULL);
2025 		if (repo_path == NULL)
2026 			return got_error_from_errno();
2027 	} else
2028 		usage_log();
2029 
2030 	error = got_repo_open(&repo, repo_path);
2031 	free(repo_path);
2032 	if (error != NULL)
2033 		return error;
2034 
2035 	if (commit_id_arg == NULL) {
2036 		error = get_head_commit_id(&commit_id, repo);
2037 		if (error != NULL)
2038 			goto done;
2039 	} else {
2040 		struct got_object *obj;
2041 		error = got_object_open_by_id_str(&obj, repo, commit_id_arg);
2042 		if (error == NULL) {
2043 			commit_id = got_object_get_id(obj);
2044 			if (commit_id == NULL)
2045 				error = got_error_from_errno();
2046 		}
2047 	}
2048 	if (error != NULL)
2049 		goto done;
2050 
2051 	error = got_object_open_as_commit(&commit, repo, commit_id);
2052 	if (error != NULL)
2053 		goto done;
2054 
2055 	error = got_object_open_as_tree(&tree, repo, commit->tree_id);
2056 	if (error != NULL)
2057 		goto done;
2058 
2059 	error = show_tree_view(tree, commit_id, repo);
2060 done:
2061 	free(commit_id);
2062 	if (commit)
2063 		got_object_commit_close(commit);
2064 	if (tree)
2065 		got_object_tree_close(tree);
2066 	if (repo)
2067 		got_repo_close(repo);
2068 	return error;
2069 }
2070 static void
2071 init_curses(void)
2072 {
2073 	initscr();
2074 	cbreak();
2075 	noecho();
2076 	nonl();
2077 	intrflush(stdscr, FALSE);
2078 	keypad(stdscr, TRUE);
2079 	curs_set(0);
2080 }
2081 
2082 __dead static void
2083 usage(void)
2084 {
2085 	int i;
2086 
2087 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
2088 	    "Available commands:\n", getprogname());
2089 	for (i = 0; i < nitems(tog_commands); i++) {
2090 		struct tog_cmd *cmd = &tog_commands[i];
2091 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
2092 	}
2093 	exit(1);
2094 }
2095 
2096 static char **
2097 make_argv(const char *arg0, const char *arg1)
2098 {
2099 	char **argv;
2100 	int argc = (arg1 == NULL ? 1 : 2);
2101 
2102 	argv = calloc(argc, sizeof(char *));
2103 	if (argv == NULL)
2104 		err(1, "calloc");
2105 	argv[0] = strdup(arg0);
2106 	if (argv[0] == NULL)
2107 		err(1, "calloc");
2108 	if (arg1) {
2109 		argv[1] = strdup(arg1);
2110 		if (argv[1] == NULL)
2111 			err(1, "calloc");
2112 	}
2113 
2114 	return argv;
2115 }
2116 
2117 int
2118 main(int argc, char *argv[])
2119 {
2120 	const struct got_error *error = NULL;
2121 	struct tog_cmd *cmd = NULL;
2122 	int ch, hflag = 0;
2123 	char **cmd_argv = NULL;
2124 
2125 	setlocale(LC_ALL, "");
2126 
2127 	while ((ch = getopt(argc, argv, "h")) != -1) {
2128 		switch (ch) {
2129 		case 'h':
2130 			hflag = 1;
2131 			break;
2132 		default:
2133 			usage();
2134 			/* NOTREACHED */
2135 		}
2136 	}
2137 
2138 	argc -= optind;
2139 	argv += optind;
2140 	optind = 0;
2141 	optreset = 1;
2142 
2143 	if (argc == 0) {
2144 		if (hflag)
2145 			usage();
2146 		/* Build an argument vector which runs a default command. */
2147 		cmd = &tog_commands[0];
2148 		cmd_argv = make_argv(cmd->name, NULL);
2149 		argc = 1;
2150 	} else {
2151 		int i;
2152 
2153 		/* Did the user specific a command? */
2154 		for (i = 0; i < nitems(tog_commands); i++) {
2155 			if (strncmp(tog_commands[i].name, argv[0],
2156 			    strlen(argv[0])) == 0) {
2157 				cmd = &tog_commands[i];
2158 				if (hflag)
2159 					tog_commands[i].cmd_usage();
2160 				break;
2161 			}
2162 		}
2163 		if (cmd == NULL) {
2164 			/* Did the user specify a repository? */
2165 			char *repo_path = realpath(argv[0], NULL);
2166 			if (repo_path) {
2167 				struct got_repository *repo;
2168 				error = got_repo_open(&repo, repo_path);
2169 				if (error == NULL)
2170 					got_repo_close(repo);
2171 			} else
2172 				error = got_error_from_errno();
2173 			if (error) {
2174 				if (hflag) {
2175 					fprintf(stderr, "%s: '%s' is not a "
2176 					    "known command\n", getprogname(),
2177 					    argv[0]);
2178 					usage();
2179 				}
2180 				fprintf(stderr, "%s: '%s' is neither a known "
2181 				    "command nor a path to a repository\n",
2182 				    getprogname(), argv[0]);
2183 				free(repo_path);
2184 				return 1;
2185 			}
2186 			cmd = &tog_commands[0];
2187 			cmd_argv = make_argv(cmd->name, repo_path);
2188 			argc = 2;
2189 			free(repo_path);
2190 		}
2191 	}
2192 
2193 	init_curses();
2194 
2195 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
2196 	if (error)
2197 		goto done;
2198 done:
2199 	endwin();
2200 	free(cmd_argv);
2201 	if (error)
2202 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
2203 	return 0;
2204 }