assume parse_commit checks commit->object.parsed
[git/git.git] / builtin / blame.c
1 /*
2 * Blame
3 *
4 * Copyright (c) 2006, Junio C Hamano
5 */
6
7 #include "cache.h"
8 #include "builtin.h"
9 #include "blob.h"
10 #include "commit.h"
11 #include "tag.h"
12 #include "tree-walk.h"
13 #include "diff.h"
14 #include "diffcore.h"
15 #include "revision.h"
16 #include "quote.h"
17 #include "xdiff-interface.h"
18 #include "cache-tree.h"
19 #include "string-list.h"
20 #include "mailmap.h"
21 #include "parse-options.h"
22 #include "utf8.h"
23 #include "userdiff.h"
24 #include "line-range.h"
25
26 static char blame_usage[] = N_("git blame [options] [rev-opts] [rev] [--] file");
27
28 static const char *blame_opt_usage[] = {
29 blame_usage,
30 "",
31 N_("[rev-opts] are documented in git-rev-list(1)"),
32 NULL
33 };
34
35 static int longest_file;
36 static int longest_author;
37 static int max_orig_digits;
38 static int max_digits;
39 static int max_score_digits;
40 static int show_root;
41 static int reverse;
42 static int blank_boundary;
43 static int incremental;
44 static int xdl_opts;
45 static int abbrev = -1;
46 static int no_whole_file_rename;
47
48 static enum date_mode blame_date_mode = DATE_ISO8601;
49 static size_t blame_date_width;
50
51 static struct string_list mailmap;
52
53 #ifndef DEBUG
54 #define DEBUG 0
55 #endif
56
57 /* stats */
58 static int num_read_blob;
59 static int num_get_patch;
60 static int num_commits;
61
62 #define PICKAXE_BLAME_MOVE 01
63 #define PICKAXE_BLAME_COPY 02
64 #define PICKAXE_BLAME_COPY_HARDER 04
65 #define PICKAXE_BLAME_COPY_HARDEST 010
66
67 /*
68 * blame for a blame_entry with score lower than these thresholds
69 * is not passed to the parent using move/copy logic.
70 */
71 static unsigned blame_move_score;
72 static unsigned blame_copy_score;
73 #define BLAME_DEFAULT_MOVE_SCORE 20
74 #define BLAME_DEFAULT_COPY_SCORE 40
75
76 /* bits #0..7 in revision.h, #8..11 used for merge_bases() in commit.c */
77 #define METAINFO_SHOWN (1u<<12)
78 #define MORE_THAN_ONE_PATH (1u<<13)
79
80 /*
81 * One blob in a commit that is being suspected
82 */
83 struct origin {
84 int refcnt;
85 struct origin *previous;
86 struct commit *commit;
87 mmfile_t file;
88 unsigned char blob_sha1[20];
89 unsigned mode;
90 char path[FLEX_ARRAY];
91 };
92
93 static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b, long ctxlen,
94 xdl_emit_hunk_consume_func_t hunk_func, void *cb_data)
95 {
96 xpparam_t xpp = {0};
97 xdemitconf_t xecfg = {0};
98 xdemitcb_t ecb = {NULL};
99
100 xpp.flags = xdl_opts;
101 xecfg.ctxlen = ctxlen;
102 xecfg.hunk_func = hunk_func;
103 ecb.priv = cb_data;
104 return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
105 }
106
107 /*
108 * Prepare diff_filespec and convert it using diff textconv API
109 * if the textconv driver exists.
110 * Return 1 if the conversion succeeds, 0 otherwise.
111 */
112 int textconv_object(const char *path,
113 unsigned mode,
114 const unsigned char *sha1,
115 int sha1_valid,
116 char **buf,
117 unsigned long *buf_size)
118 {
119 struct diff_filespec *df;
120 struct userdiff_driver *textconv;
121
122 df = alloc_filespec(path);
123 fill_filespec(df, sha1, sha1_valid, mode);
124 textconv = get_textconv(df);
125 if (!textconv) {
126 free_filespec(df);
127 return 0;
128 }
129
130 *buf_size = fill_textconv(textconv, df, buf);
131 free_filespec(df);
132 return 1;
133 }
134
135 /*
136 * Given an origin, prepare mmfile_t structure to be used by the
137 * diff machinery
138 */
139 static void fill_origin_blob(struct diff_options *opt,
140 struct origin *o, mmfile_t *file)
141 {
142 if (!o->file.ptr) {
143 enum object_type type;
144 unsigned long file_size;
145
146 num_read_blob++;
147 if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
148 textconv_object(o->path, o->mode, o->blob_sha1, 1, &file->ptr, &file_size))
149 ;
150 else
151 file->ptr = read_sha1_file(o->blob_sha1, &type, &file_size);
152 file->size = file_size;
153
154 if (!file->ptr)
155 die("Cannot read blob %s for path %s",
156 sha1_to_hex(o->blob_sha1),
157 o->path);
158 o->file = *file;
159 }
160 else
161 *file = o->file;
162 }
163
164 /*
165 * Origin is refcounted and usually we keep the blob contents to be
166 * reused.
167 */
168 static inline struct origin *origin_incref(struct origin *o)
169 {
170 if (o)
171 o->refcnt++;
172 return o;
173 }
174
175 static void origin_decref(struct origin *o)
176 {
177 if (o && --o->refcnt <= 0) {
178 if (o->previous)
179 origin_decref(o->previous);
180 free(o->file.ptr);
181 free(o);
182 }
183 }
184
185 static void drop_origin_blob(struct origin *o)
186 {
187 if (o->file.ptr) {
188 free(o->file.ptr);
189 o->file.ptr = NULL;
190 }
191 }
192
193 /*
194 * Each group of lines is described by a blame_entry; it can be split
195 * as we pass blame to the parents. They form a linked list in the
196 * scoreboard structure, sorted by the target line number.
197 */
198 struct blame_entry {
199 struct blame_entry *prev;
200 struct blame_entry *next;
201
202 /* the first line of this group in the final image;
203 * internally all line numbers are 0 based.
204 */
205 int lno;
206
207 /* how many lines this group has */
208 int num_lines;
209
210 /* the commit that introduced this group into the final image */
211 struct origin *suspect;
212
213 /* true if the suspect is truly guilty; false while we have not
214 * checked if the group came from one of its parents.
215 */
216 char guilty;
217
218 /* true if the entry has been scanned for copies in the current parent
219 */
220 char scanned;
221
222 /* the line number of the first line of this group in the
223 * suspect's file; internally all line numbers are 0 based.
224 */
225 int s_lno;
226
227 /* how significant this entry is -- cached to avoid
228 * scanning the lines over and over.
229 */
230 unsigned score;
231 };
232
233 /*
234 * The current state of the blame assignment.
235 */
236 struct scoreboard {
237 /* the final commit (i.e. where we started digging from) */
238 struct commit *final;
239 struct rev_info *revs;
240 const char *path;
241
242 /*
243 * The contents in the final image.
244 * Used by many functions to obtain contents of the nth line,
245 * indexed with scoreboard.lineno[blame_entry.lno].
246 */
247 const char *final_buf;
248 unsigned long final_buf_size;
249
250 /* linked list of blames */
251 struct blame_entry *ent;
252
253 /* look-up a line in the final buffer */
254 int num_lines;
255 int *lineno;
256 };
257
258 static inline int same_suspect(struct origin *a, struct origin *b)
259 {
260 if (a == b)
261 return 1;
262 if (a->commit != b->commit)
263 return 0;
264 return !strcmp(a->path, b->path);
265 }
266
267 static void sanity_check_refcnt(struct scoreboard *);
268
269 /*
270 * If two blame entries that are next to each other came from
271 * contiguous lines in the same origin (i.e. <commit, path> pair),
272 * merge them together.
273 */
274 static void coalesce(struct scoreboard *sb)
275 {
276 struct blame_entry *ent, *next;
277
278 for (ent = sb->ent; ent && (next = ent->next); ent = next) {
279 if (same_suspect(ent->suspect, next->suspect) &&
280 ent->guilty == next->guilty &&
281 ent->s_lno + ent->num_lines == next->s_lno) {
282 ent->num_lines += next->num_lines;
283 ent->next = next->next;
284 if (ent->next)
285 ent->next->prev = ent;
286 origin_decref(next->suspect);
287 free(next);
288 ent->score = 0;
289 next = ent; /* again */
290 }
291 }
292
293 if (DEBUG) /* sanity */
294 sanity_check_refcnt(sb);
295 }
296
297 /*
298 * Given a commit and a path in it, create a new origin structure.
299 * The callers that add blame to the scoreboard should use
300 * get_origin() to obtain shared, refcounted copy instead of calling
301 * this function directly.
302 */
303 static struct origin *make_origin(struct commit *commit, const char *path)
304 {
305 struct origin *o;
306 o = xcalloc(1, sizeof(*o) + strlen(path) + 1);
307 o->commit = commit;
308 o->refcnt = 1;
309 strcpy(o->path, path);
310 return o;
311 }
312
313 /*
314 * Locate an existing origin or create a new one.
315 */
316 static struct origin *get_origin(struct scoreboard *sb,
317 struct commit *commit,
318 const char *path)
319 {
320 struct blame_entry *e;
321
322 for (e = sb->ent; e; e = e->next) {
323 if (e->suspect->commit == commit &&
324 !strcmp(e->suspect->path, path))
325 return origin_incref(e->suspect);
326 }
327 return make_origin(commit, path);
328 }
329
330 /*
331 * Fill the blob_sha1 field of an origin if it hasn't, so that later
332 * call to fill_origin_blob() can use it to locate the data. blob_sha1
333 * for an origin is also used to pass the blame for the entire file to
334 * the parent to detect the case where a child's blob is identical to
335 * that of its parent's.
336 *
337 * This also fills origin->mode for corresponding tree path.
338 */
339 static int fill_blob_sha1_and_mode(struct origin *origin)
340 {
341 if (!is_null_sha1(origin->blob_sha1))
342 return 0;
343 if (get_tree_entry(origin->commit->object.sha1,
344 origin->path,
345 origin->blob_sha1, &origin->mode))
346 goto error_out;
347 if (sha1_object_info(origin->blob_sha1, NULL) != OBJ_BLOB)
348 goto error_out;
349 return 0;
350 error_out:
351 hashclr(origin->blob_sha1);
352 origin->mode = S_IFINVALID;
353 return -1;
354 }
355
356 /*
357 * We have an origin -- check if the same path exists in the
358 * parent and return an origin structure to represent it.
359 */
360 static struct origin *find_origin(struct scoreboard *sb,
361 struct commit *parent,
362 struct origin *origin)
363 {
364 struct origin *porigin = NULL;
365 struct diff_options diff_opts;
366 const char *paths[2];
367
368 if (parent->util) {
369 /*
370 * Each commit object can cache one origin in that
371 * commit. This is a freestanding copy of origin and
372 * not refcounted.
373 */
374 struct origin *cached = parent->util;
375 if (!strcmp(cached->path, origin->path)) {
376 /*
377 * The same path between origin and its parent
378 * without renaming -- the most common case.
379 */
380 porigin = get_origin(sb, parent, cached->path);
381
382 /*
383 * If the origin was newly created (i.e. get_origin
384 * would call make_origin if none is found in the
385 * scoreboard), it does not know the blob_sha1/mode,
386 * so copy it. Otherwise porigin was in the
387 * scoreboard and already knows blob_sha1/mode.
388 */
389 if (porigin->refcnt == 1) {
390 hashcpy(porigin->blob_sha1, cached->blob_sha1);
391 porigin->mode = cached->mode;
392 }
393 return porigin;
394 }
395 /* otherwise it was not very useful; free it */
396 free(parent->util);
397 parent->util = NULL;
398 }
399
400 /* See if the origin->path is different between parent
401 * and origin first. Most of the time they are the
402 * same and diff-tree is fairly efficient about this.
403 */
404 diff_setup(&diff_opts);
405 DIFF_OPT_SET(&diff_opts, RECURSIVE);
406 diff_opts.detect_rename = 0;
407 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
408 paths[0] = origin->path;
409 paths[1] = NULL;
410
411 diff_tree_setup_paths(paths, &diff_opts);
412 diff_setup_done(&diff_opts);
413
414 if (is_null_sha1(origin->commit->object.sha1))
415 do_diff_cache(parent->tree->object.sha1, &diff_opts);
416 else
417 diff_tree_sha1(parent->tree->object.sha1,
418 origin->commit->tree->object.sha1,
419 "", &diff_opts);
420 diffcore_std(&diff_opts);
421
422 if (!diff_queued_diff.nr) {
423 /* The path is the same as parent */
424 porigin = get_origin(sb, parent, origin->path);
425 hashcpy(porigin->blob_sha1, origin->blob_sha1);
426 porigin->mode = origin->mode;
427 } else {
428 /*
429 * Since origin->path is a pathspec, if the parent
430 * commit had it as a directory, we will see a whole
431 * bunch of deletion of files in the directory that we
432 * do not care about.
433 */
434 int i;
435 struct diff_filepair *p = NULL;
436 for (i = 0; i < diff_queued_diff.nr; i++) {
437 const char *name;
438 p = diff_queued_diff.queue[i];
439 name = p->one->path ? p->one->path : p->two->path;
440 if (!strcmp(name, origin->path))
441 break;
442 }
443 if (!p)
444 die("internal error in blame::find_origin");
445 switch (p->status) {
446 default:
447 die("internal error in blame::find_origin (%c)",
448 p->status);
449 case 'M':
450 porigin = get_origin(sb, parent, origin->path);
451 hashcpy(porigin->blob_sha1, p->one->sha1);
452 porigin->mode = p->one->mode;
453 break;
454 case 'A':
455 case 'T':
456 /* Did not exist in parent, or type changed */
457 break;
458 }
459 }
460 diff_flush(&diff_opts);
461 diff_tree_release_paths(&diff_opts);
462 if (porigin) {
463 /*
464 * Create a freestanding copy that is not part of
465 * the refcounted origin found in the scoreboard, and
466 * cache it in the commit.
467 */
468 struct origin *cached;
469
470 cached = make_origin(porigin->commit, porigin->path);
471 hashcpy(cached->blob_sha1, porigin->blob_sha1);
472 cached->mode = porigin->mode;
473 parent->util = cached;
474 }
475 return porigin;
476 }
477
478 /*
479 * We have an origin -- find the path that corresponds to it in its
480 * parent and return an origin structure to represent it.
481 */
482 static struct origin *find_rename(struct scoreboard *sb,
483 struct commit *parent,
484 struct origin *origin)
485 {
486 struct origin *porigin = NULL;
487 struct diff_options diff_opts;
488 int i;
489 const char *paths[2];
490
491 diff_setup(&diff_opts);
492 DIFF_OPT_SET(&diff_opts, RECURSIVE);
493 diff_opts.detect_rename = DIFF_DETECT_RENAME;
494 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
495 diff_opts.single_follow = origin->path;
496 paths[0] = NULL;
497 diff_tree_setup_paths(paths, &diff_opts);
498 diff_setup_done(&diff_opts);
499
500 if (is_null_sha1(origin->commit->object.sha1))
501 do_diff_cache(parent->tree->object.sha1, &diff_opts);
502 else
503 diff_tree_sha1(parent->tree->object.sha1,
504 origin->commit->tree->object.sha1,
505 "", &diff_opts);
506 diffcore_std(&diff_opts);
507
508 for (i = 0; i < diff_queued_diff.nr; i++) {
509 struct diff_filepair *p = diff_queued_diff.queue[i];
510 if ((p->status == 'R' || p->status == 'C') &&
511 !strcmp(p->two->path, origin->path)) {
512 porigin = get_origin(sb, parent, p->one->path);
513 hashcpy(porigin->blob_sha1, p->one->sha1);
514 porigin->mode = p->one->mode;
515 break;
516 }
517 }
518 diff_flush(&diff_opts);
519 diff_tree_release_paths(&diff_opts);
520 return porigin;
521 }
522
523 /*
524 * Link in a new blame entry to the scoreboard. Entries that cover the
525 * same line range have been removed from the scoreboard previously.
526 */
527 static void add_blame_entry(struct scoreboard *sb, struct blame_entry *e)
528 {
529 struct blame_entry *ent, *prev = NULL;
530
531 origin_incref(e->suspect);
532
533 for (ent = sb->ent; ent && ent->lno < e->lno; ent = ent->next)
534 prev = ent;
535
536 /* prev, if not NULL, is the last one that is below e */
537 e->prev = prev;
538 if (prev) {
539 e->next = prev->next;
540 prev->next = e;
541 }
542 else {
543 e->next = sb->ent;
544 sb->ent = e;
545 }
546 if (e->next)
547 e->next->prev = e;
548 }
549
550 /*
551 * src typically is on-stack; we want to copy the information in it to
552 * a malloced blame_entry that is already on the linked list of the
553 * scoreboard. The origin of dst loses a refcnt while the origin of src
554 * gains one.
555 */
556 static void dup_entry(struct blame_entry *dst, struct blame_entry *src)
557 {
558 struct blame_entry *p, *n;
559
560 p = dst->prev;
561 n = dst->next;
562 origin_incref(src->suspect);
563 origin_decref(dst->suspect);
564 memcpy(dst, src, sizeof(*src));
565 dst->prev = p;
566 dst->next = n;
567 dst->score = 0;
568 }
569
570 static const char *nth_line(struct scoreboard *sb, long lno)
571 {
572 return sb->final_buf + sb->lineno[lno];
573 }
574
575 static const char *nth_line_cb(void *data, long lno)
576 {
577 return nth_line((struct scoreboard *)data, lno);
578 }
579
580 /*
581 * It is known that lines between tlno to same came from parent, and e
582 * has an overlap with that range. it also is known that parent's
583 * line plno corresponds to e's line tlno.
584 *
585 * <---- e ----->
586 * <------>
587 * <------------>
588 * <------------>
589 * <------------------>
590 *
591 * Split e into potentially three parts; before this chunk, the chunk
592 * to be blamed for the parent, and after that portion.
593 */
594 static void split_overlap(struct blame_entry *split,
595 struct blame_entry *e,
596 int tlno, int plno, int same,
597 struct origin *parent)
598 {
599 int chunk_end_lno;
600 memset(split, 0, sizeof(struct blame_entry [3]));
601
602 if (e->s_lno < tlno) {
603 /* there is a pre-chunk part not blamed on parent */
604 split[0].suspect = origin_incref(e->suspect);
605 split[0].lno = e->lno;
606 split[0].s_lno = e->s_lno;
607 split[0].num_lines = tlno - e->s_lno;
608 split[1].lno = e->lno + tlno - e->s_lno;
609 split[1].s_lno = plno;
610 }
611 else {
612 split[1].lno = e->lno;
613 split[1].s_lno = plno + (e->s_lno - tlno);
614 }
615
616 if (same < e->s_lno + e->num_lines) {
617 /* there is a post-chunk part not blamed on parent */
618 split[2].suspect = origin_incref(e->suspect);
619 split[2].lno = e->lno + (same - e->s_lno);
620 split[2].s_lno = e->s_lno + (same - e->s_lno);
621 split[2].num_lines = e->s_lno + e->num_lines - same;
622 chunk_end_lno = split[2].lno;
623 }
624 else
625 chunk_end_lno = e->lno + e->num_lines;
626 split[1].num_lines = chunk_end_lno - split[1].lno;
627
628 /*
629 * if it turns out there is nothing to blame the parent for,
630 * forget about the splitting. !split[1].suspect signals this.
631 */
632 if (split[1].num_lines < 1)
633 return;
634 split[1].suspect = origin_incref(parent);
635 }
636
637 /*
638 * split_overlap() divided an existing blame e into up to three parts
639 * in split. Adjust the linked list of blames in the scoreboard to
640 * reflect the split.
641 */
642 static void split_blame(struct scoreboard *sb,
643 struct blame_entry *split,
644 struct blame_entry *e)
645 {
646 struct blame_entry *new_entry;
647
648 if (split[0].suspect && split[2].suspect) {
649 /* The first part (reuse storage for the existing entry e) */
650 dup_entry(e, &split[0]);
651
652 /* The last part -- me */
653 new_entry = xmalloc(sizeof(*new_entry));
654 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
655 add_blame_entry(sb, new_entry);
656
657 /* ... and the middle part -- parent */
658 new_entry = xmalloc(sizeof(*new_entry));
659 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
660 add_blame_entry(sb, new_entry);
661 }
662 else if (!split[0].suspect && !split[2].suspect)
663 /*
664 * The parent covers the entire area; reuse storage for
665 * e and replace it with the parent.
666 */
667 dup_entry(e, &split[1]);
668 else if (split[0].suspect) {
669 /* me and then parent */
670 dup_entry(e, &split[0]);
671
672 new_entry = xmalloc(sizeof(*new_entry));
673 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
674 add_blame_entry(sb, new_entry);
675 }
676 else {
677 /* parent and then me */
678 dup_entry(e, &split[1]);
679
680 new_entry = xmalloc(sizeof(*new_entry));
681 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
682 add_blame_entry(sb, new_entry);
683 }
684
685 if (DEBUG) { /* sanity */
686 struct blame_entry *ent;
687 int lno = sb->ent->lno, corrupt = 0;
688
689 for (ent = sb->ent; ent; ent = ent->next) {
690 if (lno != ent->lno)
691 corrupt = 1;
692 if (ent->s_lno < 0)
693 corrupt = 1;
694 lno += ent->num_lines;
695 }
696 if (corrupt) {
697 lno = sb->ent->lno;
698 for (ent = sb->ent; ent; ent = ent->next) {
699 printf("L %8d l %8d n %8d\n",
700 lno, ent->lno, ent->num_lines);
701 lno = ent->lno + ent->num_lines;
702 }
703 die("oops");
704 }
705 }
706 }
707
708 /*
709 * After splitting the blame, the origins used by the
710 * on-stack blame_entry should lose one refcnt each.
711 */
712 static void decref_split(struct blame_entry *split)
713 {
714 int i;
715
716 for (i = 0; i < 3; i++)
717 origin_decref(split[i].suspect);
718 }
719
720 /*
721 * Helper for blame_chunk(). blame_entry e is known to overlap with
722 * the patch hunk; split it and pass blame to the parent.
723 */
724 static void blame_overlap(struct scoreboard *sb, struct blame_entry *e,
725 int tlno, int plno, int same,
726 struct origin *parent)
727 {
728 struct blame_entry split[3];
729
730 split_overlap(split, e, tlno, plno, same, parent);
731 if (split[1].suspect)
732 split_blame(sb, split, e);
733 decref_split(split);
734 }
735
736 /*
737 * Find the line number of the last line the target is suspected for.
738 */
739 static int find_last_in_target(struct scoreboard *sb, struct origin *target)
740 {
741 struct blame_entry *e;
742 int last_in_target = -1;
743
744 for (e = sb->ent; e; e = e->next) {
745 if (e->guilty || !same_suspect(e->suspect, target))
746 continue;
747 if (last_in_target < e->s_lno + e->num_lines)
748 last_in_target = e->s_lno + e->num_lines;
749 }
750 return last_in_target;
751 }
752
753 /*
754 * Process one hunk from the patch between the current suspect for
755 * blame_entry e and its parent. Find and split the overlap, and
756 * pass blame to the overlapping part to the parent.
757 */
758 static void blame_chunk(struct scoreboard *sb,
759 int tlno, int plno, int same,
760 struct origin *target, struct origin *parent)
761 {
762 struct blame_entry *e;
763
764 for (e = sb->ent; e; e = e->next) {
765 if (e->guilty || !same_suspect(e->suspect, target))
766 continue;
767 if (same <= e->s_lno)
768 continue;
769 if (tlno < e->s_lno + e->num_lines)
770 blame_overlap(sb, e, tlno, plno, same, parent);
771 }
772 }
773
774 struct blame_chunk_cb_data {
775 struct scoreboard *sb;
776 struct origin *target;
777 struct origin *parent;
778 long plno;
779 long tlno;
780 };
781
782 static int blame_chunk_cb(long start_a, long count_a,
783 long start_b, long count_b, void *data)
784 {
785 struct blame_chunk_cb_data *d = data;
786 blame_chunk(d->sb, d->tlno, d->plno, start_b, d->target, d->parent);
787 d->plno = start_a + count_a;
788 d->tlno = start_b + count_b;
789 return 0;
790 }
791
792 /*
793 * We are looking at the origin 'target' and aiming to pass blame
794 * for the lines it is suspected to its parent. Run diff to find
795 * which lines came from parent and pass blame for them.
796 */
797 static int pass_blame_to_parent(struct scoreboard *sb,
798 struct origin *target,
799 struct origin *parent)
800 {
801 int last_in_target;
802 mmfile_t file_p, file_o;
803 struct blame_chunk_cb_data d;
804
805 memset(&d, 0, sizeof(d));
806 d.sb = sb; d.target = target; d.parent = parent;
807 last_in_target = find_last_in_target(sb, target);
808 if (last_in_target < 0)
809 return 1; /* nothing remains for this target */
810
811 fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
812 fill_origin_blob(&sb->revs->diffopt, target, &file_o);
813 num_get_patch++;
814
815 diff_hunks(&file_p, &file_o, 0, blame_chunk_cb, &d);
816 /* The rest (i.e. anything after tlno) are the same as the parent */
817 blame_chunk(sb, d.tlno, d.plno, last_in_target, target, parent);
818
819 return 0;
820 }
821
822 /*
823 * The lines in blame_entry after splitting blames many times can become
824 * very small and trivial, and at some point it becomes pointless to
825 * blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
826 * ordinary C program, and it is not worth to say it was copied from
827 * totally unrelated file in the parent.
828 *
829 * Compute how trivial the lines in the blame_entry are.
830 */
831 static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
832 {
833 unsigned score;
834 const char *cp, *ep;
835
836 if (e->score)
837 return e->score;
838
839 score = 1;
840 cp = nth_line(sb, e->lno);
841 ep = nth_line(sb, e->lno + e->num_lines);
842 while (cp < ep) {
843 unsigned ch = *((unsigned char *)cp);
844 if (isalnum(ch))
845 score++;
846 cp++;
847 }
848 e->score = score;
849 return score;
850 }
851
852 /*
853 * best_so_far[] and this[] are both a split of an existing blame_entry
854 * that passes blame to the parent. Maintain best_so_far the best split
855 * so far, by comparing this and best_so_far and copying this into
856 * bst_so_far as needed.
857 */
858 static void copy_split_if_better(struct scoreboard *sb,
859 struct blame_entry *best_so_far,
860 struct blame_entry *this)
861 {
862 int i;
863
864 if (!this[1].suspect)
865 return;
866 if (best_so_far[1].suspect) {
867 if (ent_score(sb, &this[1]) < ent_score(sb, &best_so_far[1]))
868 return;
869 }
870
871 for (i = 0; i < 3; i++)
872 origin_incref(this[i].suspect);
873 decref_split(best_so_far);
874 memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
875 }
876
877 /*
878 * We are looking at a part of the final image represented by
879 * ent (tlno and same are offset by ent->s_lno).
880 * tlno is where we are looking at in the final image.
881 * up to (but not including) same match preimage.
882 * plno is where we are looking at in the preimage.
883 *
884 * <-------------- final image ---------------------->
885 * <------ent------>
886 * ^tlno ^same
887 * <---------preimage----->
888 * ^plno
889 *
890 * All line numbers are 0-based.
891 */
892 static void handle_split(struct scoreboard *sb,
893 struct blame_entry *ent,
894 int tlno, int plno, int same,
895 struct origin *parent,
896 struct blame_entry *split)
897 {
898 if (ent->num_lines <= tlno)
899 return;
900 if (tlno < same) {
901 struct blame_entry this[3];
902 tlno += ent->s_lno;
903 same += ent->s_lno;
904 split_overlap(this, ent, tlno, plno, same, parent);
905 copy_split_if_better(sb, split, this);
906 decref_split(this);
907 }
908 }
909
910 struct handle_split_cb_data {
911 struct scoreboard *sb;
912 struct blame_entry *ent;
913 struct origin *parent;
914 struct blame_entry *split;
915 long plno;
916 long tlno;
917 };
918
919 static int handle_split_cb(long start_a, long count_a,
920 long start_b, long count_b, void *data)
921 {
922 struct handle_split_cb_data *d = data;
923 handle_split(d->sb, d->ent, d->tlno, d->plno, start_b, d->parent,
924 d->split);
925 d->plno = start_a + count_a;
926 d->tlno = start_b + count_b;
927 return 0;
928 }
929
930 /*
931 * Find the lines from parent that are the same as ent so that
932 * we can pass blames to it. file_p has the blob contents for
933 * the parent.
934 */
935 static void find_copy_in_blob(struct scoreboard *sb,
936 struct blame_entry *ent,
937 struct origin *parent,
938 struct blame_entry *split,
939 mmfile_t *file_p)
940 {
941 const char *cp;
942 int cnt;
943 mmfile_t file_o;
944 struct handle_split_cb_data d;
945
946 memset(&d, 0, sizeof(d));
947 d.sb = sb; d.ent = ent; d.parent = parent; d.split = split;
948 /*
949 * Prepare mmfile that contains only the lines in ent.
950 */
951 cp = nth_line(sb, ent->lno);
952 file_o.ptr = (char *) cp;
953 cnt = ent->num_lines;
954
955 while (cnt && cp < sb->final_buf + sb->final_buf_size) {
956 if (*cp++ == '\n')
957 cnt--;
958 }
959 file_o.size = cp - file_o.ptr;
960
961 /*
962 * file_o is a part of final image we are annotating.
963 * file_p partially may match that image.
964 */
965 memset(split, 0, sizeof(struct blame_entry [3]));
966 diff_hunks(file_p, &file_o, 1, handle_split_cb, &d);
967 /* remainder, if any, all match the preimage */
968 handle_split(sb, ent, d.tlno, d.plno, ent->num_lines, parent, split);
969 }
970
971 /*
972 * See if lines currently target is suspected for can be attributed to
973 * parent.
974 */
975 static int find_move_in_parent(struct scoreboard *sb,
976 struct origin *target,
977 struct origin *parent)
978 {
979 int last_in_target, made_progress;
980 struct blame_entry *e, split[3];
981 mmfile_t file_p;
982
983 last_in_target = find_last_in_target(sb, target);
984 if (last_in_target < 0)
985 return 1; /* nothing remains for this target */
986
987 fill_origin_blob(&sb->revs->diffopt, parent, &file_p);
988 if (!file_p.ptr)
989 return 0;
990
991 made_progress = 1;
992 while (made_progress) {
993 made_progress = 0;
994 for (e = sb->ent; e; e = e->next) {
995 if (e->guilty || !same_suspect(e->suspect, target) ||
996 ent_score(sb, e) < blame_move_score)
997 continue;
998 find_copy_in_blob(sb, e, parent, split, &file_p);
999 if (split[1].suspect &&
1000 blame_move_score < ent_score(sb, &split[1])) {
1001 split_blame(sb, split, e);
1002 made_progress = 1;
1003 }
1004 decref_split(split);
1005 }
1006 }
1007 return 0;
1008 }
1009
1010 struct blame_list {
1011 struct blame_entry *ent;
1012 struct blame_entry split[3];
1013 };
1014
1015 /*
1016 * Count the number of entries the target is suspected for,
1017 * and prepare a list of entry and the best split.
1018 */
1019 static struct blame_list *setup_blame_list(struct scoreboard *sb,
1020 struct origin *target,
1021 int min_score,
1022 int *num_ents_p)
1023 {
1024 struct blame_entry *e;
1025 int num_ents, i;
1026 struct blame_list *blame_list = NULL;
1027
1028 for (e = sb->ent, num_ents = 0; e; e = e->next)
1029 if (!e->scanned && !e->guilty &&
1030 same_suspect(e->suspect, target) &&
1031 min_score < ent_score(sb, e))
1032 num_ents++;
1033 if (num_ents) {
1034 blame_list = xcalloc(num_ents, sizeof(struct blame_list));
1035 for (e = sb->ent, i = 0; e; e = e->next)
1036 if (!e->scanned && !e->guilty &&
1037 same_suspect(e->suspect, target) &&
1038 min_score < ent_score(sb, e))
1039 blame_list[i++].ent = e;
1040 }
1041 *num_ents_p = num_ents;
1042 return blame_list;
1043 }
1044
1045 /*
1046 * Reset the scanned status on all entries.
1047 */
1048 static void reset_scanned_flag(struct scoreboard *sb)
1049 {
1050 struct blame_entry *e;
1051 for (e = sb->ent; e; e = e->next)
1052 e->scanned = 0;
1053 }
1054
1055 /*
1056 * For lines target is suspected for, see if we can find code movement
1057 * across file boundary from the parent commit. porigin is the path
1058 * in the parent we already tried.
1059 */
1060 static int find_copy_in_parent(struct scoreboard *sb,
1061 struct origin *target,
1062 struct commit *parent,
1063 struct origin *porigin,
1064 int opt)
1065 {
1066 struct diff_options diff_opts;
1067 const char *paths[1];
1068 int i, j;
1069 int retval;
1070 struct blame_list *blame_list;
1071 int num_ents;
1072
1073 blame_list = setup_blame_list(sb, target, blame_copy_score, &num_ents);
1074 if (!blame_list)
1075 return 1; /* nothing remains for this target */
1076
1077 diff_setup(&diff_opts);
1078 DIFF_OPT_SET(&diff_opts, RECURSIVE);
1079 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
1080
1081 paths[0] = NULL;
1082 diff_tree_setup_paths(paths, &diff_opts);
1083 diff_setup_done(&diff_opts);
1084
1085 /* Try "find copies harder" on new path if requested;
1086 * we do not want to use diffcore_rename() actually to
1087 * match things up; find_copies_harder is set only to
1088 * force diff_tree_sha1() to feed all filepairs to diff_queue,
1089 * and this code needs to be after diff_setup_done(), which
1090 * usually makes find-copies-harder imply copy detection.
1091 */
1092 if ((opt & PICKAXE_BLAME_COPY_HARDEST)
1093 || ((opt & PICKAXE_BLAME_COPY_HARDER)
1094 && (!porigin || strcmp(target->path, porigin->path))))
1095 DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
1096
1097 if (is_null_sha1(target->commit->object.sha1))
1098 do_diff_cache(parent->tree->object.sha1, &diff_opts);
1099 else
1100 diff_tree_sha1(parent->tree->object.sha1,
1101 target->commit->tree->object.sha1,
1102 "", &diff_opts);
1103
1104 if (!DIFF_OPT_TST(&diff_opts, FIND_COPIES_HARDER))
1105 diffcore_std(&diff_opts);
1106
1107 retval = 0;
1108 while (1) {
1109 int made_progress = 0;
1110
1111 for (i = 0; i < diff_queued_diff.nr; i++) {
1112 struct diff_filepair *p = diff_queued_diff.queue[i];
1113 struct origin *norigin;
1114 mmfile_t file_p;
1115 struct blame_entry this[3];
1116
1117 if (!DIFF_FILE_VALID(p->one))
1118 continue; /* does not exist in parent */
1119 if (S_ISGITLINK(p->one->mode))
1120 continue; /* ignore git links */
1121 if (porigin && !strcmp(p->one->path, porigin->path))
1122 /* find_move already dealt with this path */
1123 continue;
1124
1125 norigin = get_origin(sb, parent, p->one->path);
1126 hashcpy(norigin->blob_sha1, p->one->sha1);
1127 norigin->mode = p->one->mode;
1128 fill_origin_blob(&sb->revs->diffopt, norigin, &file_p);
1129 if (!file_p.ptr)
1130 continue;
1131
1132 for (j = 0; j < num_ents; j++) {
1133 find_copy_in_blob(sb, blame_list[j].ent,
1134 norigin, this, &file_p);
1135 copy_split_if_better(sb, blame_list[j].split,
1136 this);
1137 decref_split(this);
1138 }
1139 origin_decref(norigin);
1140 }
1141
1142 for (j = 0; j < num_ents; j++) {
1143 struct blame_entry *split = blame_list[j].split;
1144 if (split[1].suspect &&
1145 blame_copy_score < ent_score(sb, &split[1])) {
1146 split_blame(sb, split, blame_list[j].ent);
1147 made_progress = 1;
1148 }
1149 else
1150 blame_list[j].ent->scanned = 1;
1151 decref_split(split);
1152 }
1153 free(blame_list);
1154
1155 if (!made_progress)
1156 break;
1157 blame_list = setup_blame_list(sb, target, blame_copy_score, &num_ents);
1158 if (!blame_list) {
1159 retval = 1;
1160 break;
1161 }
1162 }
1163 reset_scanned_flag(sb);
1164 diff_flush(&diff_opts);
1165 diff_tree_release_paths(&diff_opts);
1166 return retval;
1167 }
1168
1169 /*
1170 * The blobs of origin and porigin exactly match, so everything
1171 * origin is suspected for can be blamed on the parent.
1172 */
1173 static void pass_whole_blame(struct scoreboard *sb,
1174 struct origin *origin, struct origin *porigin)
1175 {
1176 struct blame_entry *e;
1177
1178 if (!porigin->file.ptr && origin->file.ptr) {
1179 /* Steal its file */
1180 porigin->file = origin->file;
1181 origin->file.ptr = NULL;
1182 }
1183 for (e = sb->ent; e; e = e->next) {
1184 if (!same_suspect(e->suspect, origin))
1185 continue;
1186 origin_incref(porigin);
1187 origin_decref(e->suspect);
1188 e->suspect = porigin;
1189 }
1190 }
1191
1192 /*
1193 * We pass blame from the current commit to its parents. We keep saying
1194 * "parent" (and "porigin"), but what we mean is to find scapegoat to
1195 * exonerate ourselves.
1196 */
1197 static struct commit_list *first_scapegoat(struct rev_info *revs, struct commit *commit)
1198 {
1199 if (!reverse)
1200 return commit->parents;
1201 return lookup_decoration(&revs->children, &commit->object);
1202 }
1203
1204 static int num_scapegoats(struct rev_info *revs, struct commit *commit)
1205 {
1206 int cnt;
1207 struct commit_list *l = first_scapegoat(revs, commit);
1208 for (cnt = 0; l; l = l->next)
1209 cnt++;
1210 return cnt;
1211 }
1212
1213 #define MAXSG 16
1214
1215 static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
1216 {
1217 struct rev_info *revs = sb->revs;
1218 int i, pass, num_sg;
1219 struct commit *commit = origin->commit;
1220 struct commit_list *sg;
1221 struct origin *sg_buf[MAXSG];
1222 struct origin *porigin, **sg_origin = sg_buf;
1223
1224 num_sg = num_scapegoats(revs, commit);
1225 if (!num_sg)
1226 goto finish;
1227 else if (num_sg < ARRAY_SIZE(sg_buf))
1228 memset(sg_buf, 0, sizeof(sg_buf));
1229 else
1230 sg_origin = xcalloc(num_sg, sizeof(*sg_origin));
1231
1232 /*
1233 * The first pass looks for unrenamed path to optimize for
1234 * common cases, then we look for renames in the second pass.
1235 */
1236 for (pass = 0; pass < 2 - no_whole_file_rename; pass++) {
1237 struct origin *(*find)(struct scoreboard *,
1238 struct commit *, struct origin *);
1239 find = pass ? find_rename : find_origin;
1240
1241 for (i = 0, sg = first_scapegoat(revs, commit);
1242 i < num_sg && sg;
1243 sg = sg->next, i++) {
1244 struct commit *p = sg->item;
1245 int j, same;
1246
1247 if (sg_origin[i])
1248 continue;
1249 if (parse_commit(p))
1250 continue;
1251 porigin = find(sb, p, origin);
1252 if (!porigin)
1253 continue;
1254 if (!hashcmp(porigin->blob_sha1, origin->blob_sha1)) {
1255 pass_whole_blame(sb, origin, porigin);
1256 origin_decref(porigin);
1257 goto finish;
1258 }
1259 for (j = same = 0; j < i; j++)
1260 if (sg_origin[j] &&
1261 !hashcmp(sg_origin[j]->blob_sha1,
1262 porigin->blob_sha1)) {
1263 same = 1;
1264 break;
1265 }
1266 if (!same)
1267 sg_origin[i] = porigin;
1268 else
1269 origin_decref(porigin);
1270 }
1271 }
1272
1273 num_commits++;
1274 for (i = 0, sg = first_scapegoat(revs, commit);
1275 i < num_sg && sg;
1276 sg = sg->next, i++) {
1277 struct origin *porigin = sg_origin[i];
1278 if (!porigin)
1279 continue;
1280 if (!origin->previous) {
1281 origin_incref(porigin);
1282 origin->previous = porigin;
1283 }
1284 if (pass_blame_to_parent(sb, origin, porigin))
1285 goto finish;
1286 }
1287
1288 /*
1289 * Optionally find moves in parents' files.
1290 */
1291 if (opt & PICKAXE_BLAME_MOVE)
1292 for (i = 0, sg = first_scapegoat(revs, commit);
1293 i < num_sg && sg;
1294 sg = sg->next, i++) {
1295 struct origin *porigin = sg_origin[i];
1296 if (!porigin)
1297 continue;
1298 if (find_move_in_parent(sb, origin, porigin))
1299 goto finish;
1300 }
1301
1302 /*
1303 * Optionally find copies from parents' files.
1304 */
1305 if (opt & PICKAXE_BLAME_COPY)
1306 for (i = 0, sg = first_scapegoat(revs, commit);
1307 i < num_sg && sg;
1308 sg = sg->next, i++) {
1309 struct origin *porigin = sg_origin[i];
1310 if (find_copy_in_parent(sb, origin, sg->item,
1311 porigin, opt))
1312 goto finish;
1313 }
1314
1315 finish:
1316 for (i = 0; i < num_sg; i++) {
1317 if (sg_origin[i]) {
1318 drop_origin_blob(sg_origin[i]);
1319 origin_decref(sg_origin[i]);
1320 }
1321 }
1322 drop_origin_blob(origin);
1323 if (sg_buf != sg_origin)
1324 free(sg_origin);
1325 }
1326
1327 /*
1328 * Information on commits, used for output.
1329 */
1330 struct commit_info {
1331 struct strbuf author;
1332 struct strbuf author_mail;
1333 unsigned long author_time;
1334 struct strbuf author_tz;
1335
1336 /* filled only when asked for details */
1337 struct strbuf committer;
1338 struct strbuf committer_mail;
1339 unsigned long committer_time;
1340 struct strbuf committer_tz;
1341
1342 struct strbuf summary;
1343 };
1344
1345 /*
1346 * Parse author/committer line in the commit object buffer
1347 */
1348 static void get_ac_line(const char *inbuf, const char *what,
1349 struct strbuf *name, struct strbuf *mail,
1350 unsigned long *time, struct strbuf *tz)
1351 {
1352 struct ident_split ident;
1353 size_t len, maillen, namelen;
1354 char *tmp, *endp;
1355 const char *namebuf, *mailbuf;
1356
1357 tmp = strstr(inbuf, what);
1358 if (!tmp)
1359 goto error_out;
1360 tmp += strlen(what);
1361 endp = strchr(tmp, '\n');
1362 if (!endp)
1363 len = strlen(tmp);
1364 else
1365 len = endp - tmp;
1366
1367 if (split_ident_line(&ident, tmp, len)) {
1368 error_out:
1369 /* Ugh */
1370 tmp = "(unknown)";
1371 strbuf_addstr(name, tmp);
1372 strbuf_addstr(mail, tmp);
1373 strbuf_addstr(tz, tmp);
1374 *time = 0;
1375 return;
1376 }
1377
1378 namelen = ident.name_end - ident.name_begin;
1379 namebuf = ident.name_begin;
1380
1381 maillen = ident.mail_end - ident.mail_begin;
1382 mailbuf = ident.mail_begin;
1383
1384 if (ident.date_begin && ident.date_end)
1385 *time = strtoul(ident.date_begin, NULL, 10);
1386 else
1387 *time = 0;
1388
1389 if (ident.tz_begin && ident.tz_end)
1390 strbuf_add(tz, ident.tz_begin, ident.tz_end - ident.tz_begin);
1391 else
1392 strbuf_addstr(tz, "(unknown)");
1393
1394 /*
1395 * Now, convert both name and e-mail using mailmap
1396 */
1397 map_user(&mailmap, &mailbuf, &maillen,
1398 &namebuf, &namelen);
1399
1400 strbuf_addf(mail, "<%.*s>", (int)maillen, mailbuf);
1401 strbuf_add(name, namebuf, namelen);
1402 }
1403
1404 static void commit_info_init(struct commit_info *ci)
1405 {
1406
1407 strbuf_init(&ci->author, 0);
1408 strbuf_init(&ci->author_mail, 0);
1409 strbuf_init(&ci->author_tz, 0);
1410 strbuf_init(&ci->committer, 0);
1411 strbuf_init(&ci->committer_mail, 0);
1412 strbuf_init(&ci->committer_tz, 0);
1413 strbuf_init(&ci->summary, 0);
1414 }
1415
1416 static void commit_info_destroy(struct commit_info *ci)
1417 {
1418
1419 strbuf_release(&ci->author);
1420 strbuf_release(&ci->author_mail);
1421 strbuf_release(&ci->author_tz);
1422 strbuf_release(&ci->committer);
1423 strbuf_release(&ci->committer_mail);
1424 strbuf_release(&ci->committer_tz);
1425 strbuf_release(&ci->summary);
1426 }
1427
1428 static void get_commit_info(struct commit *commit,
1429 struct commit_info *ret,
1430 int detailed)
1431 {
1432 int len;
1433 const char *subject, *encoding;
1434 char *message;
1435
1436 commit_info_init(ret);
1437
1438 encoding = get_log_output_encoding();
1439 message = logmsg_reencode(commit, NULL, encoding);
1440 get_ac_line(message, "\nauthor ",
1441 &ret->author, &ret->author_mail,
1442 &ret->author_time, &ret->author_tz);
1443
1444 if (!detailed) {
1445 logmsg_free(message, commit);
1446 return;
1447 }
1448
1449 get_ac_line(message, "\ncommitter ",
1450 &ret->committer, &ret->committer_mail,
1451 &ret->committer_time, &ret->committer_tz);
1452
1453 len = find_commit_subject(message, &subject);
1454 if (len)
1455 strbuf_add(&ret->summary, subject, len);
1456 else
1457 strbuf_addf(&ret->summary, "(%s)", sha1_to_hex(commit->object.sha1));
1458
1459 logmsg_free(message, commit);
1460 }
1461
1462 /*
1463 * To allow LF and other nonportable characters in pathnames,
1464 * they are c-style quoted as needed.
1465 */
1466 static void write_filename_info(const char *path)
1467 {
1468 printf("filename ");
1469 write_name_quoted(path, stdout, '\n');
1470 }
1471
1472 /*
1473 * Porcelain/Incremental format wants to show a lot of details per
1474 * commit. Instead of repeating this every line, emit it only once,
1475 * the first time each commit appears in the output (unless the
1476 * user has specifically asked for us to repeat).
1477 */
1478 static int emit_one_suspect_detail(struct origin *suspect, int repeat)
1479 {
1480 struct commit_info ci;
1481
1482 if (!repeat && (suspect->commit->object.flags & METAINFO_SHOWN))
1483 return 0;
1484
1485 suspect->commit->object.flags |= METAINFO_SHOWN;
1486 get_commit_info(suspect->commit, &ci, 1);
1487 printf("author %s\n", ci.author.buf);
1488 printf("author-mail %s\n", ci.author_mail.buf);
1489 printf("author-time %lu\n", ci.author_time);
1490 printf("author-tz %s\n", ci.author_tz.buf);
1491 printf("committer %s\n", ci.committer.buf);
1492 printf("committer-mail %s\n", ci.committer_mail.buf);
1493 printf("committer-time %lu\n", ci.committer_time);
1494 printf("committer-tz %s\n", ci.committer_tz.buf);
1495 printf("summary %s\n", ci.summary.buf);
1496 if (suspect->commit->object.flags & UNINTERESTING)
1497 printf("boundary\n");
1498 if (suspect->previous) {
1499 struct origin *prev = suspect->previous;
1500 printf("previous %s ", sha1_to_hex(prev->commit->object.sha1));
1501 write_name_quoted(prev->path, stdout, '\n');
1502 }
1503
1504 commit_info_destroy(&ci);
1505
1506 return 1;
1507 }
1508
1509 /*
1510 * The blame_entry is found to be guilty for the range. Mark it
1511 * as such, and show it in incremental output.
1512 */
1513 static void found_guilty_entry(struct blame_entry *ent)
1514 {
1515 if (ent->guilty)
1516 return;
1517 ent->guilty = 1;
1518 if (incremental) {
1519 struct origin *suspect = ent->suspect;
1520
1521 printf("%s %d %d %d\n",
1522 sha1_to_hex(suspect->commit->object.sha1),
1523 ent->s_lno + 1, ent->lno + 1, ent->num_lines);
1524 emit_one_suspect_detail(suspect, 0);
1525 write_filename_info(suspect->path);
1526 maybe_flush_or_die(stdout, "stdout");
1527 }
1528 }
1529
1530 /*
1531 * The main loop -- while the scoreboard has lines whose true origin
1532 * is still unknown, pick one blame_entry, and allow its current
1533 * suspect to pass blames to its parents.
1534 */
1535 static void assign_blame(struct scoreboard *sb, int opt)
1536 {
1537 struct rev_info *revs = sb->revs;
1538
1539 while (1) {
1540 struct blame_entry *ent;
1541 struct commit *commit;
1542 struct origin *suspect = NULL;
1543
1544 /* find one suspect to break down */
1545 for (ent = sb->ent; !suspect && ent; ent = ent->next)
1546 if (!ent->guilty)
1547 suspect = ent->suspect;
1548 if (!suspect)
1549 return; /* all done */
1550
1551 /*
1552 * We will use this suspect later in the loop,
1553 * so hold onto it in the meantime.
1554 */
1555 origin_incref(suspect);
1556 commit = suspect->commit;
1557 parse_commit(commit);
1558 if (reverse ||
1559 (!(commit->object.flags & UNINTERESTING) &&
1560 !(revs->max_age != -1 && commit->date < revs->max_age)))
1561 pass_blame(sb, suspect, opt);
1562 else {
1563 commit->object.flags |= UNINTERESTING;
1564 if (commit->object.parsed)
1565 mark_parents_uninteresting(commit);
1566 }
1567 /* treat root commit as boundary */
1568 if (!commit->parents && !show_root)
1569 commit->object.flags |= UNINTERESTING;
1570
1571 /* Take responsibility for the remaining entries */
1572 for (ent = sb->ent; ent; ent = ent->next)
1573 if (same_suspect(ent->suspect, suspect))
1574 found_guilty_entry(ent);
1575 origin_decref(suspect);
1576
1577 if (DEBUG) /* sanity */
1578 sanity_check_refcnt(sb);
1579 }
1580 }
1581
1582 static const char *format_time(unsigned long time, const char *tz_str,
1583 int show_raw_time)
1584 {
1585 static char time_buf[128];
1586 const char *time_str;
1587 int time_len;
1588 int tz;
1589
1590 if (show_raw_time) {
1591 snprintf(time_buf, sizeof(time_buf), "%lu %s", time, tz_str);
1592 }
1593 else {
1594 tz = atoi(tz_str);
1595 time_str = show_date(time, tz, blame_date_mode);
1596 time_len = strlen(time_str);
1597 memcpy(time_buf, time_str, time_len);
1598 memset(time_buf + time_len, ' ', blame_date_width - time_len);
1599 }
1600 return time_buf;
1601 }
1602
1603 #define OUTPUT_ANNOTATE_COMPAT 001
1604 #define OUTPUT_LONG_OBJECT_NAME 002
1605 #define OUTPUT_RAW_TIMESTAMP 004
1606 #define OUTPUT_PORCELAIN 010
1607 #define OUTPUT_SHOW_NAME 020
1608 #define OUTPUT_SHOW_NUMBER 040
1609 #define OUTPUT_SHOW_SCORE 0100
1610 #define OUTPUT_NO_AUTHOR 0200
1611 #define OUTPUT_SHOW_EMAIL 0400
1612 #define OUTPUT_LINE_PORCELAIN 01000
1613
1614 static void emit_porcelain_details(struct origin *suspect, int repeat)
1615 {
1616 if (emit_one_suspect_detail(suspect, repeat) ||
1617 (suspect->commit->object.flags & MORE_THAN_ONE_PATH))
1618 write_filename_info(suspect->path);
1619 }
1620
1621 static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent,
1622 int opt)
1623 {
1624 int repeat = opt & OUTPUT_LINE_PORCELAIN;
1625 int cnt;
1626 const char *cp;
1627 struct origin *suspect = ent->suspect;
1628 char hex[41];
1629
1630 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1631 printf("%s%c%d %d %d\n",
1632 hex,
1633 ent->guilty ? ' ' : '*', /* purely for debugging */
1634 ent->s_lno + 1,
1635 ent->lno + 1,
1636 ent->num_lines);
1637 emit_porcelain_details(suspect, repeat);
1638
1639 cp = nth_line(sb, ent->lno);
1640 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1641 char ch;
1642 if (cnt) {
1643 printf("%s %d %d\n", hex,
1644 ent->s_lno + 1 + cnt,
1645 ent->lno + 1 + cnt);
1646 if (repeat)
1647 emit_porcelain_details(suspect, 1);
1648 }
1649 putchar('\t');
1650 do {
1651 ch = *cp++;
1652 putchar(ch);
1653 } while (ch != '\n' &&
1654 cp < sb->final_buf + sb->final_buf_size);
1655 }
1656
1657 if (sb->final_buf_size && cp[-1] != '\n')
1658 putchar('\n');
1659 }
1660
1661 static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
1662 {
1663 int cnt;
1664 const char *cp;
1665 struct origin *suspect = ent->suspect;
1666 struct commit_info ci;
1667 char hex[41];
1668 int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
1669
1670 get_commit_info(suspect->commit, &ci, 1);
1671 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1672
1673 cp = nth_line(sb, ent->lno);
1674 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1675 char ch;
1676 int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : abbrev;
1677
1678 if (suspect->commit->object.flags & UNINTERESTING) {
1679 if (blank_boundary)
1680 memset(hex, ' ', length);
1681 else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
1682 length--;
1683 putchar('^');
1684 }
1685 }
1686
1687 printf("%.*s", length, hex);
1688 if (opt & OUTPUT_ANNOTATE_COMPAT) {
1689 const char *name;
1690 if (opt & OUTPUT_SHOW_EMAIL)
1691 name = ci.author_mail.buf;
1692 else
1693 name = ci.author.buf;
1694 printf("\t(%10s\t%10s\t%d)", name,
1695 format_time(ci.author_time, ci.author_tz.buf,
1696 show_raw_time),
1697 ent->lno + 1 + cnt);
1698 } else {
1699 if (opt & OUTPUT_SHOW_SCORE)
1700 printf(" %*d %02d",
1701 max_score_digits, ent->score,
1702 ent->suspect->refcnt);
1703 if (opt & OUTPUT_SHOW_NAME)
1704 printf(" %-*.*s", longest_file, longest_file,
1705 suspect->path);
1706 if (opt & OUTPUT_SHOW_NUMBER)
1707 printf(" %*d", max_orig_digits,
1708 ent->s_lno + 1 + cnt);
1709
1710 if (!(opt & OUTPUT_NO_AUTHOR)) {
1711 const char *name;
1712 int pad;
1713 if (opt & OUTPUT_SHOW_EMAIL)
1714 name = ci.author_mail.buf;
1715 else
1716 name = ci.author.buf;
1717 pad = longest_author - utf8_strwidth(name);
1718 printf(" (%s%*s %10s",
1719 name, pad, "",
1720 format_time(ci.author_time,
1721 ci.author_tz.buf,
1722 show_raw_time));
1723 }
1724 printf(" %*d) ",
1725 max_digits, ent->lno + 1 + cnt);
1726 }
1727 do {
1728 ch = *cp++;
1729 putchar(ch);
1730 } while (ch != '\n' &&
1731 cp < sb->final_buf + sb->final_buf_size);
1732 }
1733
1734 if (sb->final_buf_size && cp[-1] != '\n')
1735 putchar('\n');
1736
1737 commit_info_destroy(&ci);
1738 }
1739
1740 static void output(struct scoreboard *sb, int option)
1741 {
1742 struct blame_entry *ent;
1743
1744 if (option & OUTPUT_PORCELAIN) {
1745 for (ent = sb->ent; ent; ent = ent->next) {
1746 struct blame_entry *oth;
1747 struct origin *suspect = ent->suspect;
1748 struct commit *commit = suspect->commit;
1749 if (commit->object.flags & MORE_THAN_ONE_PATH)
1750 continue;
1751 for (oth = ent->next; oth; oth = oth->next) {
1752 if ((oth->suspect->commit != commit) ||
1753 !strcmp(oth->suspect->path, suspect->path))
1754 continue;
1755 commit->object.flags |= MORE_THAN_ONE_PATH;
1756 break;
1757 }
1758 }
1759 }
1760
1761 for (ent = sb->ent; ent; ent = ent->next) {
1762 if (option & OUTPUT_PORCELAIN)
1763 emit_porcelain(sb, ent, option);
1764 else {
1765 emit_other(sb, ent, option);
1766 }
1767 }
1768 }
1769
1770 /*
1771 * To allow quick access to the contents of nth line in the
1772 * final image, prepare an index in the scoreboard.
1773 */
1774 static int prepare_lines(struct scoreboard *sb)
1775 {
1776 const char *buf = sb->final_buf;
1777 unsigned long len = sb->final_buf_size;
1778 int num = 0, incomplete = 0, bol = 1;
1779
1780 if (len && buf[len-1] != '\n')
1781 incomplete++; /* incomplete line at the end */
1782 while (len--) {
1783 if (bol) {
1784 sb->lineno = xrealloc(sb->lineno,
1785 sizeof(int *) * (num + 1));
1786 sb->lineno[num] = buf - sb->final_buf;
1787 bol = 0;
1788 }
1789 if (*buf++ == '\n') {
1790 num++;
1791 bol = 1;
1792 }
1793 }
1794 sb->lineno = xrealloc(sb->lineno,
1795 sizeof(int *) * (num + incomplete + 1));
1796 sb->lineno[num + incomplete] = buf - sb->final_buf;
1797 sb->num_lines = num + incomplete;
1798 return sb->num_lines;
1799 }
1800
1801 /*
1802 * Add phony grafts for use with -S; this is primarily to
1803 * support git's cvsserver that wants to give a linear history
1804 * to its clients.
1805 */
1806 static int read_ancestry(const char *graft_file)
1807 {
1808 FILE *fp = fopen(graft_file, "r");
1809 char buf[1024];
1810 if (!fp)
1811 return -1;
1812 while (fgets(buf, sizeof(buf), fp)) {
1813 /* The format is just "Commit Parent1 Parent2 ...\n" */
1814 int len = strlen(buf);
1815 struct commit_graft *graft = read_graft_line(buf, len);
1816 if (graft)
1817 register_commit_graft(graft, 0);
1818 }
1819 fclose(fp);
1820 return 0;
1821 }
1822
1823 static int update_auto_abbrev(int auto_abbrev, struct origin *suspect)
1824 {
1825 const char *uniq = find_unique_abbrev(suspect->commit->object.sha1,
1826 auto_abbrev);
1827 int len = strlen(uniq);
1828 if (auto_abbrev < len)
1829 return len;
1830 return auto_abbrev;
1831 }
1832
1833 /*
1834 * How many columns do we need to show line numbers, authors,
1835 * and filenames?
1836 */
1837 static void find_alignment(struct scoreboard *sb, int *option)
1838 {
1839 int longest_src_lines = 0;
1840 int longest_dst_lines = 0;
1841 unsigned largest_score = 0;
1842 struct blame_entry *e;
1843 int compute_auto_abbrev = (abbrev < 0);
1844 int auto_abbrev = default_abbrev;
1845
1846 for (e = sb->ent; e; e = e->next) {
1847 struct origin *suspect = e->suspect;
1848 struct commit_info ci;
1849 int num;
1850
1851 if (compute_auto_abbrev)
1852 auto_abbrev = update_auto_abbrev(auto_abbrev, suspect);
1853 if (strcmp(suspect->path, sb->path))
1854 *option |= OUTPUT_SHOW_NAME;
1855 num = strlen(suspect->path);
1856 if (longest_file < num)
1857 longest_file = num;
1858 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1859 suspect->commit->object.flags |= METAINFO_SHOWN;
1860 get_commit_info(suspect->commit, &ci, 1);
1861 if (*option & OUTPUT_SHOW_EMAIL)
1862 num = utf8_strwidth(ci.author_mail.buf);
1863 else
1864 num = utf8_strwidth(ci.author.buf);
1865 if (longest_author < num)
1866 longest_author = num;
1867 }
1868 num = e->s_lno + e->num_lines;
1869 if (longest_src_lines < num)
1870 longest_src_lines = num;
1871 num = e->lno + e->num_lines;
1872 if (longest_dst_lines < num)
1873 longest_dst_lines = num;
1874 if (largest_score < ent_score(sb, e))
1875 largest_score = ent_score(sb, e);
1876
1877 commit_info_destroy(&ci);
1878 }
1879 max_orig_digits = decimal_width(longest_src_lines);
1880 max_digits = decimal_width(longest_dst_lines);
1881 max_score_digits = decimal_width(largest_score);
1882
1883 if (compute_auto_abbrev)
1884 /* one more abbrev length is needed for the boundary commit */
1885 abbrev = auto_abbrev + 1;
1886 }
1887
1888 /*
1889 * For debugging -- origin is refcounted, and this asserts that
1890 * we do not underflow.
1891 */
1892 static void sanity_check_refcnt(struct scoreboard *sb)
1893 {
1894 int baa = 0;
1895 struct blame_entry *ent;
1896
1897 for (ent = sb->ent; ent; ent = ent->next) {
1898 /* Nobody should have zero or negative refcnt */
1899 if (ent->suspect->refcnt <= 0) {
1900 fprintf(stderr, "%s in %s has negative refcnt %d\n",
1901 ent->suspect->path,
1902 sha1_to_hex(ent->suspect->commit->object.sha1),
1903 ent->suspect->refcnt);
1904 baa = 1;
1905 }
1906 }
1907 if (baa) {
1908 int opt = 0160;
1909 find_alignment(sb, &opt);
1910 output(sb, opt);
1911 die("Baa %d!", baa);
1912 }
1913 }
1914
1915 /*
1916 * Used for the command line parsing; check if the path exists
1917 * in the working tree.
1918 */
1919 static int has_string_in_work_tree(const char *path)
1920 {
1921 struct stat st;
1922 return !lstat(path, &st);
1923 }
1924
1925 static unsigned parse_score(const char *arg)
1926 {
1927 char *end;
1928 unsigned long score = strtoul(arg, &end, 10);
1929 if (*end)
1930 return 0;
1931 return score;
1932 }
1933
1934 static const char *add_prefix(const char *prefix, const char *path)
1935 {
1936 return prefix_path(prefix, prefix ? strlen(prefix) : 0, path);
1937 }
1938
1939 /*
1940 * Parsing of -L option
1941 */
1942 static void prepare_blame_range(struct scoreboard *sb,
1943 const char *bottomtop,
1944 long lno,
1945 long *bottom, long *top)
1946 {
1947 if (parse_range_arg(bottomtop, nth_line_cb, sb, lno, bottom, top, sb->path))
1948 usage(blame_usage);
1949 }
1950
1951 static int git_blame_config(const char *var, const char *value, void *cb)
1952 {
1953 if (!strcmp(var, "blame.showroot")) {
1954 show_root = git_config_bool(var, value);
1955 return 0;
1956 }
1957 if (!strcmp(var, "blame.blankboundary")) {
1958 blank_boundary = git_config_bool(var, value);
1959 return 0;
1960 }
1961 if (!strcmp(var, "blame.date")) {
1962 if (!value)
1963 return config_error_nonbool(var);
1964 blame_date_mode = parse_date_format(value);
1965 return 0;
1966 }
1967
1968 if (userdiff_config(var, value) < 0)
1969 return -1;
1970
1971 return git_default_config(var, value, cb);
1972 }
1973
1974 static void verify_working_tree_path(struct commit *work_tree, const char *path)
1975 {
1976 struct commit_list *parents;
1977
1978 for (parents = work_tree->parents; parents; parents = parents->next) {
1979 const unsigned char *commit_sha1 = parents->item->object.sha1;
1980 unsigned char blob_sha1[20];
1981 unsigned mode;
1982
1983 if (!get_tree_entry(commit_sha1, path, blob_sha1, &mode) &&
1984 sha1_object_info(blob_sha1, NULL) == OBJ_BLOB)
1985 return;
1986 }
1987 die("no such path '%s' in HEAD", path);
1988 }
1989
1990 static struct commit_list **append_parent(struct commit_list **tail, const unsigned char *sha1)
1991 {
1992 struct commit *parent;
1993
1994 parent = lookup_commit_reference(sha1);
1995 if (!parent)
1996 die("no such commit %s", sha1_to_hex(sha1));
1997 return &commit_list_insert(parent, tail)->next;
1998 }
1999
2000 static void append_merge_parents(struct commit_list **tail)
2001 {
2002 int merge_head;
2003 const char *merge_head_file = git_path("MERGE_HEAD");
2004 struct strbuf line = STRBUF_INIT;
2005
2006 merge_head = open(merge_head_file, O_RDONLY);
2007 if (merge_head < 0) {
2008 if (errno == ENOENT)
2009 return;
2010 die("cannot open '%s' for reading", merge_head_file);
2011 }
2012
2013 while (!strbuf_getwholeline_fd(&line, merge_head, '\n')) {
2014 unsigned char sha1[20];
2015 if (line.len < 40 || get_sha1_hex(line.buf, sha1))
2016 die("unknown line in '%s': %s", merge_head_file, line.buf);
2017 tail = append_parent(tail, sha1);
2018 }
2019 close(merge_head);
2020 strbuf_release(&line);
2021 }
2022
2023 /*
2024 * Prepare a dummy commit that represents the work tree (or staged) item.
2025 * Note that annotating work tree item never works in the reverse.
2026 */
2027 static struct commit *fake_working_tree_commit(struct diff_options *opt,
2028 const char *path,
2029 const char *contents_from)
2030 {
2031 struct commit *commit;
2032 struct origin *origin;
2033 struct commit_list **parent_tail, *parent;
2034 unsigned char head_sha1[20];
2035 struct strbuf buf = STRBUF_INIT;
2036 const char *ident;
2037 time_t now;
2038 int size, len;
2039 struct cache_entry *ce;
2040 unsigned mode;
2041 struct strbuf msg = STRBUF_INIT;
2042
2043 time(&now);
2044 commit = xcalloc(1, sizeof(*commit));
2045 commit->object.parsed = 1;
2046 commit->date = now;
2047 commit->object.type = OBJ_COMMIT;
2048 parent_tail = &commit->parents;
2049
2050 if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL))
2051 die("no such ref: HEAD");
2052
2053 parent_tail = append_parent(parent_tail, head_sha1);
2054 append_merge_parents(parent_tail);
2055 verify_working_tree_path(commit, path);
2056
2057 origin = make_origin(commit, path);
2058
2059 ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
2060 strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
2061 for (parent = commit->parents; parent; parent = parent->next)
2062 strbuf_addf(&msg, "parent %s\n",
2063 sha1_to_hex(parent->item->object.sha1));
2064 strbuf_addf(&msg,
2065 "author %s\n"
2066 "committer %s\n\n"
2067 "Version of %s from %s\n",
2068 ident, ident, path,
2069 (!contents_from ? path :
2070 (!strcmp(contents_from, "-") ? "standard input" : contents_from)));
2071 commit->buffer = strbuf_detach(&msg, NULL);
2072
2073 if (!contents_from || strcmp("-", contents_from)) {
2074 struct stat st;
2075 const char *read_from;
2076 char *buf_ptr;
2077 unsigned long buf_len;
2078
2079 if (contents_from) {
2080 if (stat(contents_from, &st) < 0)
2081 die_errno("Cannot stat '%s'", contents_from);
2082 read_from = contents_from;
2083 }
2084 else {
2085 if (lstat(path, &st) < 0)
2086 die_errno("Cannot lstat '%s'", path);
2087 read_from = path;
2088 }
2089 mode = canon_mode(st.st_mode);
2090
2091 switch (st.st_mode & S_IFMT) {
2092 case S_IFREG:
2093 if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
2094 textconv_object(read_from, mode, null_sha1, 0, &buf_ptr, &buf_len))
2095 strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1);
2096 else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size)
2097 die_errno("cannot open or read '%s'", read_from);
2098 break;
2099 case S_IFLNK:
2100 if (strbuf_readlink(&buf, read_from, st.st_size) < 0)
2101 die_errno("cannot readlink '%s'", read_from);
2102 break;
2103 default:
2104 die("unsupported file type %s", read_from);
2105 }
2106 }
2107 else {
2108 /* Reading from stdin */
2109 mode = 0;
2110 if (strbuf_read(&buf, 0, 0) < 0)
2111 die_errno("failed to read from stdin");
2112 }
2113 convert_to_git(path, buf.buf, buf.len, &buf, 0);
2114 origin->file.ptr = buf.buf;
2115 origin->file.size = buf.len;
2116 pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_sha1);
2117 commit->util = origin;
2118
2119 /*
2120 * Read the current index, replace the path entry with
2121 * origin->blob_sha1 without mucking with its mode or type
2122 * bits; we are not going to write this index out -- we just
2123 * want to run "diff-index --cached".
2124 */
2125 discard_cache();
2126 read_cache();
2127
2128 len = strlen(path);
2129 if (!mode) {
2130 int pos = cache_name_pos(path, len);
2131 if (0 <= pos)
2132 mode = active_cache[pos]->ce_mode;
2133 else
2134 /* Let's not bother reading from HEAD tree */
2135 mode = S_IFREG | 0644;
2136 }
2137 size = cache_entry_size(len);
2138 ce = xcalloc(1, size);
2139 hashcpy(ce->sha1, origin->blob_sha1);
2140 memcpy(ce->name, path, len);
2141 ce->ce_flags = create_ce_flags(0);
2142 ce->ce_namelen = len;
2143 ce->ce_mode = create_ce_mode(mode);
2144 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
2145
2146 /*
2147 * We are not going to write this out, so this does not matter
2148 * right now, but someday we might optimize diff-index --cached
2149 * with cache-tree information.
2150 */
2151 cache_tree_invalidate_path(active_cache_tree, path);
2152
2153 return commit;
2154 }
2155
2156 static const char *prepare_final(struct scoreboard *sb)
2157 {
2158 int i;
2159 const char *final_commit_name = NULL;
2160 struct rev_info *revs = sb->revs;
2161
2162 /*
2163 * There must be one and only one positive commit in the
2164 * revs->pending array.
2165 */
2166 for (i = 0; i < revs->pending.nr; i++) {
2167 struct object *obj = revs->pending.objects[i].item;
2168 if (obj->flags & UNINTERESTING)
2169 continue;
2170 while (obj->type == OBJ_TAG)
2171 obj = deref_tag(obj, NULL, 0);
2172 if (obj->type != OBJ_COMMIT)
2173 die("Non commit %s?", revs->pending.objects[i].name);
2174 if (sb->final)
2175 die("More than one commit to dig from %s and %s?",
2176 revs->pending.objects[i].name,
2177 final_commit_name);
2178 sb->final = (struct commit *) obj;
2179 final_commit_name = revs->pending.objects[i].name;
2180 }
2181 return final_commit_name;
2182 }
2183
2184 static const char *prepare_initial(struct scoreboard *sb)
2185 {
2186 int i;
2187 const char *final_commit_name = NULL;
2188 struct rev_info *revs = sb->revs;
2189
2190 /*
2191 * There must be one and only one negative commit, and it must be
2192 * the boundary.
2193 */
2194 for (i = 0; i < revs->pending.nr; i++) {
2195 struct object *obj = revs->pending.objects[i].item;
2196 if (!(obj->flags & UNINTERESTING))
2197 continue;
2198 while (obj->type == OBJ_TAG)
2199 obj = deref_tag(obj, NULL, 0);
2200 if (obj->type != OBJ_COMMIT)
2201 die("Non commit %s?", revs->pending.objects[i].name);
2202 if (sb->final)
2203 die("More than one commit to dig down to %s and %s?",
2204 revs->pending.objects[i].name,
2205 final_commit_name);
2206 sb->final = (struct commit *) obj;
2207 final_commit_name = revs->pending.objects[i].name;
2208 }
2209 if (!final_commit_name)
2210 die("No commit to dig down to?");
2211 return final_commit_name;
2212 }
2213
2214 static int blame_copy_callback(const struct option *option, const char *arg, int unset)
2215 {
2216 int *opt = option->value;
2217
2218 /*
2219 * -C enables copy from removed files;
2220 * -C -C enables copy from existing files, but only
2221 * when blaming a new file;
2222 * -C -C -C enables copy from existing files for
2223 * everybody
2224 */
2225 if (*opt & PICKAXE_BLAME_COPY_HARDER)
2226 *opt |= PICKAXE_BLAME_COPY_HARDEST;
2227 if (*opt & PICKAXE_BLAME_COPY)
2228 *opt |= PICKAXE_BLAME_COPY_HARDER;
2229 *opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
2230
2231 if (arg)
2232 blame_copy_score = parse_score(arg);
2233 return 0;
2234 }
2235
2236 static int blame_move_callback(const struct option *option, const char *arg, int unset)
2237 {
2238 int *opt = option->value;
2239
2240 *opt |= PICKAXE_BLAME_MOVE;
2241
2242 if (arg)
2243 blame_move_score = parse_score(arg);
2244 return 0;
2245 }
2246
2247 static int blame_bottomtop_callback(const struct option *option, const char *arg, int unset)
2248 {
2249 const char **bottomtop = option->value;
2250 if (!arg)
2251 return -1;
2252 if (*bottomtop)
2253 die("More than one '-L n,m' option given");
2254 *bottomtop = arg;
2255 return 0;
2256 }
2257
2258 int cmd_blame(int argc, const char **argv, const char *prefix)
2259 {
2260 struct rev_info revs;
2261 const char *path;
2262 struct scoreboard sb;
2263 struct origin *o;
2264 struct blame_entry *ent;
2265 long dashdash_pos, bottom, top, lno;
2266 const char *final_commit_name = NULL;
2267 enum object_type type;
2268
2269 static const char *bottomtop = NULL;
2270 static int output_option = 0, opt = 0;
2271 static int show_stats = 0;
2272 static const char *revs_file = NULL;
2273 static const char *contents_from = NULL;
2274 static const struct option options[] = {
2275 OPT_BOOLEAN(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
2276 OPT_BOOLEAN('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
2277 OPT_BOOLEAN(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),
2278 OPT_BOOLEAN(0, "show-stats", &show_stats, N_("Show work cost statistics")),
2279 OPT_BIT(0, "score-debug", &output_option, N_("Show output score for blame entries"), OUTPUT_SHOW_SCORE),
2280 OPT_BIT('f', "show-name", &output_option, N_("Show original filename (Default: auto)"), OUTPUT_SHOW_NAME),
2281 OPT_BIT('n', "show-number", &output_option, N_("Show original linenumber (Default: off)"), OUTPUT_SHOW_NUMBER),
2282 OPT_BIT('p', "porcelain", &output_option, N_("Show in a format designed for machine consumption"), OUTPUT_PORCELAIN),
2283 OPT_BIT(0, "line-porcelain", &output_option, N_("Show porcelain format with per-line commit information"), OUTPUT_PORCELAIN|OUTPUT_LINE_PORCELAIN),
2284 OPT_BIT('c', NULL, &output_option, N_("Use the same output mode as git-annotate (Default: off)"), OUTPUT_ANNOTATE_COMPAT),
2285 OPT_BIT('t', NULL, &output_option, N_("Show raw timestamp (Default: off)"), OUTPUT_RAW_TIMESTAMP),
2286 OPT_BIT('l', NULL, &output_option, N_("Show long commit SHA1 (Default: off)"), OUTPUT_LONG_OBJECT_NAME),
2287 OPT_BIT('s', NULL, &output_option, N_("Suppress author name and timestamp (Default: off)"), OUTPUT_NO_AUTHOR),
2288 OPT_BIT('e', "show-email", &output_option, N_("Show author email instead of name (Default: off)"), OUTPUT_SHOW_EMAIL),
2289 OPT_BIT('w', NULL, &xdl_opts, N_("Ignore whitespace differences"), XDF_IGNORE_WHITESPACE),
2290 OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
2291 OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
2292 OPT_STRING(0, "contents", &contents_from, N_("file"), N_("Use <file>'s contents as the final image")),
2293 { OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
2294 { OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
2295 OPT_CALLBACK('L', NULL, &bottomtop, N_("n,m"), N_("Process only line range n,m, counting from 1"), blame_bottomtop_callback),
2296 OPT__ABBREV(&abbrev),
2297 OPT_END()
2298 };
2299
2300 struct parse_opt_ctx_t ctx;
2301 int cmd_is_annotate = !strcmp(argv[0], "annotate");
2302
2303 git_config(git_blame_config, NULL);
2304 init_revisions(&revs, NULL);
2305 revs.date_mode = blame_date_mode;
2306 DIFF_OPT_SET(&revs.diffopt, ALLOW_TEXTCONV);
2307 DIFF_OPT_SET(&revs.diffopt, FOLLOW_RENAMES);
2308
2309 save_commit_buffer = 0;
2310 dashdash_pos = 0;
2311
2312 parse_options_start(&ctx, argc, argv, prefix, options,
2313 PARSE_OPT_KEEP_DASHDASH | PARSE_OPT_KEEP_ARGV0);
2314 for (;;) {
2315 switch (parse_options_step(&ctx, options, blame_opt_usage)) {
2316 case PARSE_OPT_HELP:
2317 exit(129);
2318 case PARSE_OPT_DONE:
2319 if (ctx.argv[0])
2320 dashdash_pos = ctx.cpidx;
2321 goto parse_done;
2322 }
2323
2324 if (!strcmp(ctx.argv[0], "--reverse")) {
2325 ctx.argv[0] = "--children";
2326 reverse = 1;
2327 }
2328 parse_revision_opt(&revs, &ctx, options, blame_opt_usage);
2329 }
2330 parse_done:
2331 no_whole_file_rename = !DIFF_OPT_TST(&revs.diffopt, FOLLOW_RENAMES);
2332 DIFF_OPT_CLR(&revs.diffopt, FOLLOW_RENAMES);
2333 argc = parse_options_end(&ctx);
2334
2335 if (0 < abbrev)
2336 /* one more abbrev length is needed for the boundary commit */
2337 abbrev++;
2338
2339 if (revs_file && read_ancestry(revs_file))
2340 die_errno("reading graft file '%s' failed", revs_file);
2341
2342 if (cmd_is_annotate) {
2343 output_option |= OUTPUT_ANNOTATE_COMPAT;
2344 blame_date_mode = DATE_ISO8601;
2345 } else {
2346 blame_date_mode = revs.date_mode;
2347 }
2348
2349 /* The maximum width used to show the dates */
2350 switch (blame_date_mode) {
2351 case DATE_RFC2822:
2352 blame_date_width = sizeof("Thu, 19 Oct 2006 16:00:04 -0700");
2353 break;
2354 case DATE_ISO8601:
2355 blame_date_width = sizeof("2006-10-19 16:00:04 -0700");
2356 break;
2357 case DATE_RAW:
2358 blame_date_width = sizeof("1161298804 -0700");
2359 break;
2360 case DATE_SHORT:
2361 blame_date_width = sizeof("2006-10-19");
2362 break;
2363 case DATE_RELATIVE:
2364 /* "normal" is used as the fallback for "relative" */
2365 case DATE_LOCAL:
2366 case DATE_NORMAL:
2367 blame_date_width = sizeof("Thu Oct 19 16:00:04 2006 -0700");
2368 break;
2369 }
2370 blame_date_width -= 1; /* strip the null */
2371
2372 if (DIFF_OPT_TST(&revs.diffopt, FIND_COPIES_HARDER))
2373 opt |= (PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE |
2374 PICKAXE_BLAME_COPY_HARDER);
2375
2376 if (!blame_move_score)
2377 blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
2378 if (!blame_copy_score)
2379 blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
2380
2381 /*
2382 * We have collected options unknown to us in argv[1..unk]
2383 * which are to be passed to revision machinery if we are
2384 * going to do the "bottom" processing.
2385 *
2386 * The remaining are:
2387 *
2388 * (1) if dashdash_pos != 0, it is either
2389 * "blame [revisions] -- <path>" or
2390 * "blame -- <path> <rev>"
2391 *
2392 * (2) otherwise, it is one of the two:
2393 * "blame [revisions] <path>"
2394 * "blame <path> <rev>"
2395 *
2396 * Note that we must strip out <path> from the arguments: we do not
2397 * want the path pruning but we may want "bottom" processing.
2398 */
2399 if (dashdash_pos) {
2400 switch (argc - dashdash_pos - 1) {
2401 case 2: /* (1b) */
2402 if (argc != 4)
2403 usage_with_options(blame_opt_usage, options);
2404 /* reorder for the new way: <rev> -- <path> */
2405 argv[1] = argv[3];
2406 argv[3] = argv[2];
2407 argv[2] = "--";
2408 /* FALLTHROUGH */
2409 case 1: /* (1a) */
2410 path = add_prefix(prefix, argv[--argc]);
2411 argv[argc] = NULL;
2412 break;
2413 default:
2414 usage_with_options(blame_opt_usage, options);
2415 }
2416 } else {
2417 if (argc < 2)
2418 usage_with_options(blame_opt_usage, options);
2419 path = add_prefix(prefix, argv[argc - 1]);
2420 if (argc == 3 && !has_string_in_work_tree(path)) { /* (2b) */
2421 path = add_prefix(prefix, argv[1]);
2422 argv[1] = argv[2];
2423 }
2424 argv[argc - 1] = "--";
2425
2426 setup_work_tree();
2427 if (!has_string_in_work_tree(path))
2428 die_errno("cannot stat path '%s'", path);
2429 }
2430
2431 revs.disable_stdin = 1;
2432 setup_revisions(argc, argv, &revs, NULL);
2433 memset(&sb, 0, sizeof(sb));
2434
2435 sb.revs = &revs;
2436 if (!reverse)
2437 final_commit_name = prepare_final(&sb);
2438 else if (contents_from)
2439 die("--contents and --children do not blend well.");
2440 else
2441 final_commit_name = prepare_initial(&sb);
2442
2443 if (!sb.final) {
2444 /*
2445 * "--not A B -- path" without anything positive;
2446 * do not default to HEAD, but use the working tree
2447 * or "--contents".
2448 */
2449 setup_work_tree();
2450 sb.final = fake_working_tree_commit(&sb.revs->diffopt,
2451 path, contents_from);
2452 add_pending_object(&revs, &(sb.final->object), ":");
2453 }
2454 else if (contents_from)
2455 die("Cannot use --contents with final commit object name");
2456
2457 /*
2458 * If we have bottom, this will mark the ancestors of the
2459 * bottom commits we would reach while traversing as
2460 * uninteresting.
2461 */
2462 if (prepare_revision_walk(&revs))
2463 die("revision walk setup failed");
2464
2465 if (is_null_sha1(sb.final->object.sha1)) {
2466 char *buf;
2467 o = sb.final->util;
2468 buf = xmalloc(o->file.size + 1);
2469 memcpy(buf, o->file.ptr, o->file.size + 1);
2470 sb.final_buf = buf;
2471 sb.final_buf_size = o->file.size;
2472 }
2473 else {
2474 o = get_origin(&sb, sb.final, path);
2475 if (fill_blob_sha1_and_mode(o))
2476 die("no such path %s in %s", path, final_commit_name);
2477
2478 if (DIFF_OPT_TST(&sb.revs->diffopt, ALLOW_TEXTCONV) &&
2479 textconv_object(path, o->mode, o->blob_sha1, 1, (char **) &sb.final_buf,
2480 &sb.final_buf_size))
2481 ;
2482 else
2483 sb.final_buf = read_sha1_file(o->blob_sha1, &type,
2484 &sb.final_buf_size);
2485
2486 if (!sb.final_buf)
2487 die("Cannot read blob %s for path %s",
2488 sha1_to_hex(o->blob_sha1),
2489 path);
2490 }
2491 num_read_blob++;
2492 lno = prepare_lines(&sb);
2493
2494 bottom = top = 0;
2495 if (bottomtop)
2496 prepare_blame_range(&sb, bottomtop, lno, &bottom, &top);
2497 if (bottom < 1)
2498 bottom = 1;
2499 if (top < 1)
2500 top = lno;
2501 bottom--;
2502 if (lno < top || lno < bottom)
2503 die("file %s has only %lu lines", path, lno);
2504
2505 ent = xcalloc(1, sizeof(*ent));
2506 ent->lno = bottom;
2507 ent->num_lines = top - bottom;
2508 ent->suspect = o;
2509 ent->s_lno = bottom;
2510
2511 sb.ent = ent;
2512 sb.path = path;
2513
2514 read_mailmap(&mailmap, NULL);
2515
2516 if (!incremental)
2517 setup_pager();
2518
2519 assign_blame(&sb, opt);
2520
2521 if (incremental)
2522 return 0;
2523
2524 coalesce(&sb);
2525
2526 if (!(output_option & OUTPUT_PORCELAIN))
2527 find_alignment(&sb, &output_option);
2528
2529 output(&sb, output_option);
2530 free((void *)sb.final_buf);
2531 for (ent = sb.ent; ent; ) {
2532 struct blame_entry *e = ent->next;
2533 free(ent);
2534 ent = e;
2535 }
2536
2537 if (show_stats) {
2538 printf("num read blob: %d\n", num_read_blob);
2539 printf("num get patch: %d\n", num_get_patch);
2540 printf("num commits: %d\n", num_commits);
2541 }
2542 return 0;
2543 }