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git-svn: error checking for invalid [svn-remote "..."] sections
[git/debian.git] / builtin-blame.c
blob530b97f97d2661d53a39d2101eeadd86be2e6b00
1 /*
2 * Pickaxe
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
20 static char blame_usage[] =
21 "git-blame [-c] [-l] [-t] [-f] [-n] [-p] [-L n,m] [-S <revs-file>] [-M] [-C] [-C] [--contents <filename>] [--incremental] [commit] [--] file\n"
22 " -c, --compatibility Use the same output mode as git-annotate (Default: off)\n"
23 " -b Show blank SHA-1 for boundary commits (Default: off)\n"
24 " -l, --long Show long commit SHA1 (Default: off)\n"
25 " --root Do not treat root commits as boundaries (Default: off)\n"
26 " -t, --time Show raw timestamp (Default: off)\n"
27 " -f, --show-name Show original filename (Default: auto)\n"
28 " -n, --show-number Show original linenumber (Default: off)\n"
29 " -p, --porcelain Show in a format designed for machine consumption\n"
30 " -L n,m Process only line range n,m, counting from 1\n"
31 " -M, -C Find line movements within and across files\n"
32 " --incremental Show blame entries as we find them, incrementally\n"
33 " --contents file Use <file>'s contents as the final image\n"
34 " -S revs-file Use revisions from revs-file instead of calling git-rev-list\n";
35
36 static int longest_file;
37 static int longest_author;
38 static int max_orig_digits;
39 static int max_digits;
40 static int max_score_digits;
41 static int show_root;
42 static int blank_boundary;
43 static int incremental;
44 static int cmd_is_annotate;
45
46 #ifndef DEBUG
47 #define DEBUG 0
48 #endif
49
50 /* stats */
51 static int num_read_blob;
52 static int num_get_patch;
53 static int num_commits;
54
55 #define PICKAXE_BLAME_MOVE 01
56 #define PICKAXE_BLAME_COPY 02
57 #define PICKAXE_BLAME_COPY_HARDER 04
58
59 /*
60 * blame for a blame_entry with score lower than these thresholds
61 * is not passed to the parent using move/copy logic.
62 */
63 static unsigned blame_move_score;
64 static unsigned blame_copy_score;
65 #define BLAME_DEFAULT_MOVE_SCORE 20
66 #define BLAME_DEFAULT_COPY_SCORE 40
67
68 /* bits #0..7 in revision.h, #8..11 used for merge_bases() in commit.c */
69 #define METAINFO_SHOWN (1u<<12)
70 #define MORE_THAN_ONE_PATH (1u<<13)
71
72 /*
73 * One blob in a commit that is being suspected
74 */
75 struct origin {
76 int refcnt;
77 struct commit *commit;
78 mmfile_t file;
79 unsigned char blob_sha1[20];
80 char path[FLEX_ARRAY];
81 };
82
83 /*
84 * Given an origin, prepare mmfile_t structure to be used by the
85 * diff machinery
86 */
87 static char *fill_origin_blob(struct origin *o, mmfile_t *file)
88 {
89 if (!o->file.ptr) {
90 char type[10];
91 num_read_blob++;
92 file->ptr = read_sha1_file(o->blob_sha1, type,
93 (unsigned long *)(&(file->size)));
94 o->file = *file;
95 }
96 else
97 *file = o->file;
98 return file->ptr;
99 }
100
101 /*
102 * Origin is refcounted and usually we keep the blob contents to be
103 * reused.
104 */
105 static inline struct origin *origin_incref(struct origin *o)
106 {
107 if (o)
108 o->refcnt++;
109 return o;
110 }
111
112 static void origin_decref(struct origin *o)
113 {
114 if (o && --o->refcnt <= 0) {
115 if (o->file.ptr)
116 free(o->file.ptr);
117 memset(o, 0, sizeof(*o));
118 free(o);
119 }
120 }
121
122 /*
123 * Each group of lines is described by a blame_entry; it can be split
124 * as we pass blame to the parents. They form a linked list in the
125 * scoreboard structure, sorted by the target line number.
126 */
127 struct blame_entry {
128 struct blame_entry *prev;
129 struct blame_entry *next;
130
131 /* the first line of this group in the final image;
132 * internally all line numbers are 0 based.
133 */
134 int lno;
135
136 /* how many lines this group has */
137 int num_lines;
138
139 /* the commit that introduced this group into the final image */
140 struct origin *suspect;
141
142 /* true if the suspect is truly guilty; false while we have not
143 * checked if the group came from one of its parents.
144 */
145 char guilty;
146
147 /* the line number of the first line of this group in the
148 * suspect's file; internally all line numbers are 0 based.
149 */
150 int s_lno;
151
152 /* how significant this entry is -- cached to avoid
153 * scanning the lines over and over.
154 */
155 unsigned score;
156 };
157
158 /*
159 * The current state of the blame assignment.
160 */
161 struct scoreboard {
162 /* the final commit (i.e. where we started digging from) */
163 struct commit *final;
164
165 const char *path;
166
167 /*
168 * The contents in the final image.
169 * Used by many functions to obtain contents of the nth line,
170 * indexed with scoreboard.lineno[blame_entry.lno].
171 */
172 const char *final_buf;
173 unsigned long final_buf_size;
174
175 /* linked list of blames */
176 struct blame_entry *ent;
177
178 /* look-up a line in the final buffer */
179 int num_lines;
180 int *lineno;
181 };
182
183 static int cmp_suspect(struct origin *a, struct origin *b)
184 {
185 int cmp = hashcmp(a->commit->object.sha1, b->commit->object.sha1);
186 if (cmp)
187 return cmp;
188 return strcmp(a->path, b->path);
189 }
190
191 #define cmp_suspect(a, b) ( ((a)==(b)) ? 0 : cmp_suspect(a,b) )
192
193 static void sanity_check_refcnt(struct scoreboard *);
194
195 /*
196 * If two blame entries that are next to each other came from
197 * contiguous lines in the same origin (i.e. <commit, path> pair),
198 * merge them together.
199 */
200 static void coalesce(struct scoreboard *sb)
201 {
202 struct blame_entry *ent, *next;
203
204 for (ent = sb->ent; ent && (next = ent->next); ent = next) {
205 if (!cmp_suspect(ent->suspect, next->suspect) &&
206 ent->guilty == next->guilty &&
207 ent->s_lno + ent->num_lines == next->s_lno) {
208 ent->num_lines += next->num_lines;
209 ent->next = next->next;
210 if (ent->next)
211 ent->next->prev = ent;
212 origin_decref(next->suspect);
213 free(next);
214 ent->score = 0;
215 next = ent; /* again */
216 }
217 }
218
219 if (DEBUG) /* sanity */
220 sanity_check_refcnt(sb);
221 }
222
223 /*
224 * Given a commit and a path in it, create a new origin structure.
225 * The callers that add blame to the scoreboard should use
226 * get_origin() to obtain shared, refcounted copy instead of calling
227 * this function directly.
228 */
229 static struct origin *make_origin(struct commit *commit, const char *path)
230 {
231 struct origin *o;
232 o = xcalloc(1, sizeof(*o) + strlen(path) + 1);
233 o->commit = commit;
234 o->refcnt = 1;
235 strcpy(o->path, path);
236 return o;
237 }
238
239 /*
240 * Locate an existing origin or create a new one.
241 */
242 static struct origin *get_origin(struct scoreboard *sb,
243 struct commit *commit,
244 const char *path)
245 {
246 struct blame_entry *e;
247
248 for (e = sb->ent; e; e = e->next) {
249 if (e->suspect->commit == commit &&
250 !strcmp(e->suspect->path, path))
251 return origin_incref(e->suspect);
252 }
253 return make_origin(commit, path);
254 }
255
256 /*
257 * Fill the blob_sha1 field of an origin if it hasn't, so that later
258 * call to fill_origin_blob() can use it to locate the data. blob_sha1
259 * for an origin is also used to pass the blame for the entire file to
260 * the parent to detect the case where a child's blob is identical to
261 * that of its parent's.
262 */
263 static int fill_blob_sha1(struct origin *origin)
264 {
265 unsigned mode;
266 char type[10];
267
268 if (!is_null_sha1(origin->blob_sha1))
269 return 0;
270 if (get_tree_entry(origin->commit->object.sha1,
271 origin->path,
272 origin->blob_sha1, &mode))
273 goto error_out;
274 if (sha1_object_info(origin->blob_sha1, type, NULL) ||
275 strcmp(type, blob_type))
276 goto error_out;
277 return 0;
278 error_out:
279 hashclr(origin->blob_sha1);
280 return -1;
281 }
282
283 /*
284 * We have an origin -- check if the same path exists in the
285 * parent and return an origin structure to represent it.
286 */
287 static struct origin *find_origin(struct scoreboard *sb,
288 struct commit *parent,
289 struct origin *origin)
290 {
291 struct origin *porigin = NULL;
292 struct diff_options diff_opts;
293 const char *paths[2];
294
295 if (parent->util) {
296 /*
297 * Each commit object can cache one origin in that
298 * commit. This is a freestanding copy of origin and
299 * not refcounted.
300 */
301 struct origin *cached = parent->util;
302 if (!strcmp(cached->path, origin->path)) {
303 /*
304 * The same path between origin and its parent
305 * without renaming -- the most common case.
306 */
307 porigin = get_origin(sb, parent, cached->path);
308
309 /*
310 * If the origin was newly created (i.e. get_origin
311 * would call make_origin if none is found in the
312 * scoreboard), it does not know the blob_sha1,
313 * so copy it. Otherwise porigin was in the
314 * scoreboard and already knows blob_sha1.
315 */
316 if (porigin->refcnt == 1)
317 hashcpy(porigin->blob_sha1, cached->blob_sha1);
318 return porigin;
319 }
320 /* otherwise it was not very useful; free it */
321 free(parent->util);
322 parent->util = NULL;
323 }
324
325 /* See if the origin->path is different between parent
326 * and origin first. Most of the time they are the
327 * same and diff-tree is fairly efficient about this.
328 */
329 diff_setup(&diff_opts);
330 diff_opts.recursive = 1;
331 diff_opts.detect_rename = 0;
332 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
333 paths[0] = origin->path;
334 paths[1] = NULL;
335
336 diff_tree_setup_paths(paths, &diff_opts);
337 if (diff_setup_done(&diff_opts) < 0)
338 die("diff-setup");
339
340 if (is_null_sha1(origin->commit->object.sha1))
341 do_diff_cache(parent->tree->object.sha1, &diff_opts);
342 else
343 diff_tree_sha1(parent->tree->object.sha1,
344 origin->commit->tree->object.sha1,
345 "", &diff_opts);
346 diffcore_std(&diff_opts);
347
348 /* It is either one entry that says "modified", or "created",
349 * or nothing.
350 */
351 if (!diff_queued_diff.nr) {
352 /* The path is the same as parent */
353 porigin = get_origin(sb, parent, origin->path);
354 hashcpy(porigin->blob_sha1, origin->blob_sha1);
355 }
356 else if (diff_queued_diff.nr != 1)
357 die("internal error in blame::find_origin");
358 else {
359 struct diff_filepair *p = diff_queued_diff.queue[0];
360 switch (p->status) {
361 default:
362 die("internal error in blame::find_origin (%c)",
363 p->status);
364 case 'M':
365 porigin = get_origin(sb, parent, origin->path);
366 hashcpy(porigin->blob_sha1, p->one->sha1);
367 break;
368 case 'A':
369 case 'T':
370 /* Did not exist in parent, or type changed */
371 break;
372 }
373 }
374 diff_flush(&diff_opts);
375 if (porigin) {
376 /*
377 * Create a freestanding copy that is not part of
378 * the refcounted origin found in the scoreboard, and
379 * cache it in the commit.
380 */
381 struct origin *cached;
382
383 cached = make_origin(porigin->commit, porigin->path);
384 hashcpy(cached->blob_sha1, porigin->blob_sha1);
385 parent->util = cached;
386 }
387 return porigin;
388 }
389
390 /*
391 * We have an origin -- find the path that corresponds to it in its
392 * parent and return an origin structure to represent it.
393 */
394 static struct origin *find_rename(struct scoreboard *sb,
395 struct commit *parent,
396 struct origin *origin)
397 {
398 struct origin *porigin = NULL;
399 struct diff_options diff_opts;
400 int i;
401 const char *paths[2];
402
403 diff_setup(&diff_opts);
404 diff_opts.recursive = 1;
405 diff_opts.detect_rename = DIFF_DETECT_RENAME;
406 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
407 diff_opts.single_follow = origin->path;
408 paths[0] = NULL;
409 diff_tree_setup_paths(paths, &diff_opts);
410 if (diff_setup_done(&diff_opts) < 0)
411 die("diff-setup");
412
413 if (is_null_sha1(origin->commit->object.sha1))
414 do_diff_cache(parent->tree->object.sha1, &diff_opts);
415 else
416 diff_tree_sha1(parent->tree->object.sha1,
417 origin->commit->tree->object.sha1,
418 "", &diff_opts);
419 diffcore_std(&diff_opts);
420
421 for (i = 0; i < diff_queued_diff.nr; i++) {
422 struct diff_filepair *p = diff_queued_diff.queue[i];
423 if ((p->status == 'R' || p->status == 'C') &&
424 !strcmp(p->two->path, origin->path)) {
425 porigin = get_origin(sb, parent, p->one->path);
426 hashcpy(porigin->blob_sha1, p->one->sha1);
427 break;
428 }
429 }
430 diff_flush(&diff_opts);
431 return porigin;
432 }
433
434 /*
435 * Parsing of patch chunks...
436 */
437 struct chunk {
438 /* line number in postimage; up to but not including this
439 * line is the same as preimage
440 */
441 int same;
442
443 /* preimage line number after this chunk */
444 int p_next;
445
446 /* postimage line number after this chunk */
447 int t_next;
448 };
449
450 struct patch {
451 struct chunk *chunks;
452 int num;
453 };
454
455 struct blame_diff_state {
456 struct xdiff_emit_state xm;
457 struct patch *ret;
458 unsigned hunk_post_context;
459 unsigned hunk_in_pre_context : 1;
460 };
461
462 static void process_u_diff(void *state_, char *line, unsigned long len)
463 {
464 struct blame_diff_state *state = state_;
465 struct chunk *chunk;
466 int off1, off2, len1, len2, num;
467
468 num = state->ret->num;
469 if (len < 4 || line[0] != '@' || line[1] != '@') {
470 if (state->hunk_in_pre_context && line[0] == ' ')
471 state->ret->chunks[num - 1].same++;
472 else {
473 state->hunk_in_pre_context = 0;
474 if (line[0] == ' ')
475 state->hunk_post_context++;
476 else
477 state->hunk_post_context = 0;
478 }
479 return;
480 }
481
482 if (num && state->hunk_post_context) {
483 chunk = &state->ret->chunks[num - 1];
484 chunk->p_next -= state->hunk_post_context;
485 chunk->t_next -= state->hunk_post_context;
486 }
487 state->ret->num = ++num;
488 state->ret->chunks = xrealloc(state->ret->chunks,
489 sizeof(struct chunk) * num);
490 chunk = &state->ret->chunks[num - 1];
491 if (parse_hunk_header(line, len, &off1, &len1, &off2, &len2)) {
492 state->ret->num--;
493 return;
494 }
495
496 /* Line numbers in patch output are one based. */
497 off1--;
498 off2--;
499
500 chunk->same = len2 ? off2 : (off2 + 1);
501
502 chunk->p_next = off1 + (len1 ? len1 : 1);
503 chunk->t_next = chunk->same + len2;
504 state->hunk_in_pre_context = 1;
505 state->hunk_post_context = 0;
506 }
507
508 static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
509 int context)
510 {
511 struct blame_diff_state state;
512 xpparam_t xpp;
513 xdemitconf_t xecfg;
514 xdemitcb_t ecb;
515
516 xpp.flags = XDF_NEED_MINIMAL;
517 xecfg.ctxlen = context;
518 xecfg.flags = 0;
519 ecb.outf = xdiff_outf;
520 ecb.priv = &state;
521 memset(&state, 0, sizeof(state));
522 state.xm.consume = process_u_diff;
523 state.ret = xmalloc(sizeof(struct patch));
524 state.ret->chunks = NULL;
525 state.ret->num = 0;
526
527 xdl_diff(file_p, file_o, &xpp, &xecfg, &ecb);
528
529 if (state.ret->num) {
530 struct chunk *chunk;
531 chunk = &state.ret->chunks[state.ret->num - 1];
532 chunk->p_next -= state.hunk_post_context;
533 chunk->t_next -= state.hunk_post_context;
534 }
535 return state.ret;
536 }
537
538 /*
539 * Run diff between two origins and grab the patch output, so that
540 * we can pass blame for lines origin is currently suspected for
541 * to its parent.
542 */
543 static struct patch *get_patch(struct origin *parent, struct origin *origin)
544 {
545 mmfile_t file_p, file_o;
546 struct patch *patch;
547
548 fill_origin_blob(parent, &file_p);
549 fill_origin_blob(origin, &file_o);
550 if (!file_p.ptr || !file_o.ptr)
551 return NULL;
552 patch = compare_buffer(&file_p, &file_o, 0);
553 num_get_patch++;
554 return patch;
555 }
556
557 static void free_patch(struct patch *p)
558 {
559 free(p->chunks);
560 free(p);
561 }
562
563 /*
564 * Link in a new blame entry to the scoreboard. Entries that cover the
565 * same line range have been removed from the scoreboard previously.
566 */
567 static void add_blame_entry(struct scoreboard *sb, struct blame_entry *e)
568 {
569 struct blame_entry *ent, *prev = NULL;
570
571 origin_incref(e->suspect);
572
573 for (ent = sb->ent; ent && ent->lno < e->lno; ent = ent->next)
574 prev = ent;
575
576 /* prev, if not NULL, is the last one that is below e */
577 e->prev = prev;
578 if (prev) {
579 e->next = prev->next;
580 prev->next = e;
581 }
582 else {
583 e->next = sb->ent;
584 sb->ent = e;
585 }
586 if (e->next)
587 e->next->prev = e;
588 }
589
590 /*
591 * src typically is on-stack; we want to copy the information in it to
592 * an malloced blame_entry that is already on the linked list of the
593 * scoreboard. The origin of dst loses a refcnt while the origin of src
594 * gains one.
595 */
596 static void dup_entry(struct blame_entry *dst, struct blame_entry *src)
597 {
598 struct blame_entry *p, *n;
599
600 p = dst->prev;
601 n = dst->next;
602 origin_incref(src->suspect);
603 origin_decref(dst->suspect);
604 memcpy(dst, src, sizeof(*src));
605 dst->prev = p;
606 dst->next = n;
607 dst->score = 0;
608 }
609
610 static const char *nth_line(struct scoreboard *sb, int lno)
611 {
612 return sb->final_buf + sb->lineno[lno];
613 }
614
615 /*
616 * It is known that lines between tlno to same came from parent, and e
617 * has an overlap with that range. it also is known that parent's
618 * line plno corresponds to e's line tlno.
619 *
620 * <---- e ----->
621 * <------>
622 * <------------>
623 * <------------>
624 * <------------------>
625 *
626 * Split e into potentially three parts; before this chunk, the chunk
627 * to be blamed for the parent, and after that portion.
628 */
629 static void split_overlap(struct blame_entry *split,
630 struct blame_entry *e,
631 int tlno, int plno, int same,
632 struct origin *parent)
633 {
634 int chunk_end_lno;
635 memset(split, 0, sizeof(struct blame_entry [3]));
636
637 if (e->s_lno < tlno) {
638 /* there is a pre-chunk part not blamed on parent */
639 split[0].suspect = origin_incref(e->suspect);
640 split[0].lno = e->lno;
641 split[0].s_lno = e->s_lno;
642 split[0].num_lines = tlno - e->s_lno;
643 split[1].lno = e->lno + tlno - e->s_lno;
644 split[1].s_lno = plno;
645 }
646 else {
647 split[1].lno = e->lno;
648 split[1].s_lno = plno + (e->s_lno - tlno);
649 }
650
651 if (same < e->s_lno + e->num_lines) {
652 /* there is a post-chunk part not blamed on parent */
653 split[2].suspect = origin_incref(e->suspect);
654 split[2].lno = e->lno + (same - e->s_lno);
655 split[2].s_lno = e->s_lno + (same - e->s_lno);
656 split[2].num_lines = e->s_lno + e->num_lines - same;
657 chunk_end_lno = split[2].lno;
658 }
659 else
660 chunk_end_lno = e->lno + e->num_lines;
661 split[1].num_lines = chunk_end_lno - split[1].lno;
662
663 /*
664 * if it turns out there is nothing to blame the parent for,
665 * forget about the splitting. !split[1].suspect signals this.
666 */
667 if (split[1].num_lines < 1)
668 return;
669 split[1].suspect = origin_incref(parent);
670 }
671
672 /*
673 * split_overlap() divided an existing blame e into up to three parts
674 * in split. Adjust the linked list of blames in the scoreboard to
675 * reflect the split.
676 */
677 static void split_blame(struct scoreboard *sb,
678 struct blame_entry *split,
679 struct blame_entry *e)
680 {
681 struct blame_entry *new_entry;
682
683 if (split[0].suspect && split[2].suspect) {
684 /* The first part (reuse storage for the existing entry e) */
685 dup_entry(e, &split[0]);
686
687 /* The last part -- me */
688 new_entry = xmalloc(sizeof(*new_entry));
689 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
690 add_blame_entry(sb, new_entry);
691
692 /* ... and the middle part -- parent */
693 new_entry = xmalloc(sizeof(*new_entry));
694 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
695 add_blame_entry(sb, new_entry);
696 }
697 else if (!split[0].suspect && !split[2].suspect)
698 /*
699 * The parent covers the entire area; reuse storage for
700 * e and replace it with the parent.
701 */
702 dup_entry(e, &split[1]);
703 else if (split[0].suspect) {
704 /* me and then parent */
705 dup_entry(e, &split[0]);
706
707 new_entry = xmalloc(sizeof(*new_entry));
708 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
709 add_blame_entry(sb, new_entry);
710 }
711 else {
712 /* parent and then me */
713 dup_entry(e, &split[1]);
714
715 new_entry = xmalloc(sizeof(*new_entry));
716 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
717 add_blame_entry(sb, new_entry);
718 }
719
720 if (DEBUG) { /* sanity */
721 struct blame_entry *ent;
722 int lno = sb->ent->lno, corrupt = 0;
723
724 for (ent = sb->ent; ent; ent = ent->next) {
725 if (lno != ent->lno)
726 corrupt = 1;
727 if (ent->s_lno < 0)
728 corrupt = 1;
729 lno += ent->num_lines;
730 }
731 if (corrupt) {
732 lno = sb->ent->lno;
733 for (ent = sb->ent; ent; ent = ent->next) {
734 printf("L %8d l %8d n %8d\n",
735 lno, ent->lno, ent->num_lines);
736 lno = ent->lno + ent->num_lines;
737 }
738 die("oops");
739 }
740 }
741 }
742
743 /*
744 * After splitting the blame, the origins used by the
745 * on-stack blame_entry should lose one refcnt each.
746 */
747 static void decref_split(struct blame_entry *split)
748 {
749 int i;
750
751 for (i = 0; i < 3; i++)
752 origin_decref(split[i].suspect);
753 }
754
755 /*
756 * Helper for blame_chunk(). blame_entry e is known to overlap with
757 * the patch hunk; split it and pass blame to the parent.
758 */
759 static void blame_overlap(struct scoreboard *sb, struct blame_entry *e,
760 int tlno, int plno, int same,
761 struct origin *parent)
762 {
763 struct blame_entry split[3];
764
765 split_overlap(split, e, tlno, plno, same, parent);
766 if (split[1].suspect)
767 split_blame(sb, split, e);
768 decref_split(split);
769 }
770
771 /*
772 * Find the line number of the last line the target is suspected for.
773 */
774 static int find_last_in_target(struct scoreboard *sb, struct origin *target)
775 {
776 struct blame_entry *e;
777 int last_in_target = -1;
778
779 for (e = sb->ent; e; e = e->next) {
780 if (e->guilty || cmp_suspect(e->suspect, target))
781 continue;
782 if (last_in_target < e->s_lno + e->num_lines)
783 last_in_target = e->s_lno + e->num_lines;
784 }
785 return last_in_target;
786 }
787
788 /*
789 * Process one hunk from the patch between the current suspect for
790 * blame_entry e and its parent. Find and split the overlap, and
791 * pass blame to the overlapping part to the parent.
792 */
793 static void blame_chunk(struct scoreboard *sb,
794 int tlno, int plno, int same,
795 struct origin *target, struct origin *parent)
796 {
797 struct blame_entry *e;
798
799 for (e = sb->ent; e; e = e->next) {
800 if (e->guilty || cmp_suspect(e->suspect, target))
801 continue;
802 if (same <= e->s_lno)
803 continue;
804 if (tlno < e->s_lno + e->num_lines)
805 blame_overlap(sb, e, tlno, plno, same, parent);
806 }
807 }
808
809 /*
810 * We are looking at the origin 'target' and aiming to pass blame
811 * for the lines it is suspected to its parent. Run diff to find
812 * which lines came from parent and pass blame for them.
813 */
814 static int pass_blame_to_parent(struct scoreboard *sb,
815 struct origin *target,
816 struct origin *parent)
817 {
818 int i, last_in_target, plno, tlno;
819 struct patch *patch;
820
821 last_in_target = find_last_in_target(sb, target);
822 if (last_in_target < 0)
823 return 1; /* nothing remains for this target */
824
825 patch = get_patch(parent, target);
826 plno = tlno = 0;
827 for (i = 0; i < patch->num; i++) {
828 struct chunk *chunk = &patch->chunks[i];
829
830 blame_chunk(sb, tlno, plno, chunk->same, target, parent);
831 plno = chunk->p_next;
832 tlno = chunk->t_next;
833 }
834 /* The rest (i.e. anything after tlno) are the same as the parent */
835 blame_chunk(sb, tlno, plno, last_in_target, target, parent);
836
837 free_patch(patch);
838 return 0;
839 }
840
841 /*
842 * The lines in blame_entry after splitting blames many times can become
843 * very small and trivial, and at some point it becomes pointless to
844 * blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
845 * ordinary C program, and it is not worth to say it was copied from
846 * totally unrelated file in the parent.
847 *
848 * Compute how trivial the lines in the blame_entry are.
849 */
850 static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
851 {
852 unsigned score;
853 const char *cp, *ep;
854
855 if (e->score)
856 return e->score;
857
858 score = 1;
859 cp = nth_line(sb, e->lno);
860 ep = nth_line(sb, e->lno + e->num_lines);
861 while (cp < ep) {
862 unsigned ch = *((unsigned char *)cp);
863 if (isalnum(ch))
864 score++;
865 cp++;
866 }
867 e->score = score;
868 return score;
869 }
870
871 /*
872 * best_so_far[] and this[] are both a split of an existing blame_entry
873 * that passes blame to the parent. Maintain best_so_far the best split
874 * so far, by comparing this and best_so_far and copying this into
875 * bst_so_far as needed.
876 */
877 static void copy_split_if_better(struct scoreboard *sb,
878 struct blame_entry *best_so_far,
879 struct blame_entry *this)
880 {
881 int i;
882
883 if (!this[1].suspect)
884 return;
885 if (best_so_far[1].suspect) {
886 if (ent_score(sb, &this[1]) < ent_score(sb, &best_so_far[1]))
887 return;
888 }
889
890 for (i = 0; i < 3; i++)
891 origin_incref(this[i].suspect);
892 decref_split(best_so_far);
893 memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
894 }
895
896 /*
897 * Find the lines from parent that are the same as ent so that
898 * we can pass blames to it. file_p has the blob contents for
899 * the parent.
900 */
901 static void find_copy_in_blob(struct scoreboard *sb,
902 struct blame_entry *ent,
903 struct origin *parent,
904 struct blame_entry *split,
905 mmfile_t *file_p)
906 {
907 const char *cp;
908 int cnt;
909 mmfile_t file_o;
910 struct patch *patch;
911 int i, plno, tlno;
912
913 /*
914 * Prepare mmfile that contains only the lines in ent.
915 */
916 cp = nth_line(sb, ent->lno);
917 file_o.ptr = (char*) cp;
918 cnt = ent->num_lines;
919
920 while (cnt && cp < sb->final_buf + sb->final_buf_size) {
921 if (*cp++ == '\n')
922 cnt--;
923 }
924 file_o.size = cp - file_o.ptr;
925
926 patch = compare_buffer(file_p, &file_o, 1);
927
928 memset(split, 0, sizeof(struct blame_entry [3]));
929 plno = tlno = 0;
930 for (i = 0; i < patch->num; i++) {
931 struct chunk *chunk = &patch->chunks[i];
932
933 /* tlno to chunk->same are the same as ent */
934 if (ent->num_lines <= tlno)
935 break;
936 if (tlno < chunk->same) {
937 struct blame_entry this[3];
938 split_overlap(this, ent,
939 tlno + ent->s_lno, plno,
940 chunk->same + ent->s_lno,
941 parent);
942 copy_split_if_better(sb, split, this);
943 decref_split(this);
944 }
945 plno = chunk->p_next;
946 tlno = chunk->t_next;
947 }
948 free_patch(patch);
949 }
950
951 /*
952 * See if lines currently target is suspected for can be attributed to
953 * parent.
954 */
955 static int find_move_in_parent(struct scoreboard *sb,
956 struct origin *target,
957 struct origin *parent)
958 {
959 int last_in_target, made_progress;
960 struct blame_entry *e, split[3];
961 mmfile_t file_p;
962
963 last_in_target = find_last_in_target(sb, target);
964 if (last_in_target < 0)
965 return 1; /* nothing remains for this target */
966
967 fill_origin_blob(parent, &file_p);
968 if (!file_p.ptr)
969 return 0;
970
971 made_progress = 1;
972 while (made_progress) {
973 made_progress = 0;
974 for (e = sb->ent; e; e = e->next) {
975 if (e->guilty || cmp_suspect(e->suspect, target))
976 continue;
977 find_copy_in_blob(sb, e, parent, split, &file_p);
978 if (split[1].suspect &&
979 blame_move_score < ent_score(sb, &split[1])) {
980 split_blame(sb, split, e);
981 made_progress = 1;
982 }
983 decref_split(split);
984 }
985 }
986 return 0;
987 }
988
989 struct blame_list {
990 struct blame_entry *ent;
991 struct blame_entry split[3];
992 };
993
994 /*
995 * Count the number of entries the target is suspected for,
996 * and prepare a list of entry and the best split.
997 */
998 static struct blame_list *setup_blame_list(struct scoreboard *sb,
999 struct origin *target,
1000 int *num_ents_p)
1001 {
1002 struct blame_entry *e;
1003 int num_ents, i;
1004 struct blame_list *blame_list = NULL;
1005
1006 for (e = sb->ent, num_ents = 0; e; e = e->next)
1007 if (!e->guilty && !cmp_suspect(e->suspect, target))
1008 num_ents++;
1009 if (num_ents) {
1010 blame_list = xcalloc(num_ents, sizeof(struct blame_list));
1011 for (e = sb->ent, i = 0; e; e = e->next)
1012 if (!e->guilty && !cmp_suspect(e->suspect, target))
1013 blame_list[i++].ent = e;
1014 }
1015 *num_ents_p = num_ents;
1016 return blame_list;
1017 }
1018
1019 /*
1020 * For lines target is suspected for, see if we can find code movement
1021 * across file boundary from the parent commit. porigin is the path
1022 * in the parent we already tried.
1023 */
1024 static int find_copy_in_parent(struct scoreboard *sb,
1025 struct origin *target,
1026 struct commit *parent,
1027 struct origin *porigin,
1028 int opt)
1029 {
1030 struct diff_options diff_opts;
1031 const char *paths[1];
1032 int i, j;
1033 int retval;
1034 struct blame_list *blame_list;
1035 int num_ents;
1036
1037 blame_list = setup_blame_list(sb, target, &num_ents);
1038 if (!blame_list)
1039 return 1; /* nothing remains for this target */
1040
1041 diff_setup(&diff_opts);
1042 diff_opts.recursive = 1;
1043 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
1044
1045 paths[0] = NULL;
1046 diff_tree_setup_paths(paths, &diff_opts);
1047 if (diff_setup_done(&diff_opts) < 0)
1048 die("diff-setup");
1049
1050 /* Try "find copies harder" on new path if requested;
1051 * we do not want to use diffcore_rename() actually to
1052 * match things up; find_copies_harder is set only to
1053 * force diff_tree_sha1() to feed all filepairs to diff_queue,
1054 * and this code needs to be after diff_setup_done(), which
1055 * usually makes find-copies-harder imply copy detection.
1056 */
1057 if ((opt & PICKAXE_BLAME_COPY_HARDER) &&
1058 (!porigin || strcmp(target->path, porigin->path)))
1059 diff_opts.find_copies_harder = 1;
1060
1061 if (is_null_sha1(target->commit->object.sha1))
1062 do_diff_cache(parent->tree->object.sha1, &diff_opts);
1063 else
1064 diff_tree_sha1(parent->tree->object.sha1,
1065 target->commit->tree->object.sha1,
1066 "", &diff_opts);
1067
1068 if (!diff_opts.find_copies_harder)
1069 diffcore_std(&diff_opts);
1070
1071 retval = 0;
1072 while (1) {
1073 int made_progress = 0;
1074
1075 for (i = 0; i < diff_queued_diff.nr; i++) {
1076 struct diff_filepair *p = diff_queued_diff.queue[i];
1077 struct origin *norigin;
1078 mmfile_t file_p;
1079 struct blame_entry this[3];
1080
1081 if (!DIFF_FILE_VALID(p->one))
1082 continue; /* does not exist in parent */
1083 if (porigin && !strcmp(p->one->path, porigin->path))
1084 /* find_move already dealt with this path */
1085 continue;
1086
1087 norigin = get_origin(sb, parent, p->one->path);
1088 hashcpy(norigin->blob_sha1, p->one->sha1);
1089 fill_origin_blob(norigin, &file_p);
1090 if (!file_p.ptr)
1091 continue;
1092
1093 for (j = 0; j < num_ents; j++) {
1094 find_copy_in_blob(sb, blame_list[j].ent,
1095 norigin, this, &file_p);
1096 copy_split_if_better(sb, blame_list[j].split,
1097 this);
1098 decref_split(this);
1099 }
1100 origin_decref(norigin);
1101 }
1102
1103 for (j = 0; j < num_ents; j++) {
1104 struct blame_entry *split = blame_list[j].split;
1105 if (split[1].suspect &&
1106 blame_copy_score < ent_score(sb, &split[1])) {
1107 split_blame(sb, split, blame_list[j].ent);
1108 made_progress = 1;
1109 }
1110 decref_split(split);
1111 }
1112 free(blame_list);
1113
1114 if (!made_progress)
1115 break;
1116 blame_list = setup_blame_list(sb, target, &num_ents);
1117 if (!blame_list) {
1118 retval = 1;
1119 break;
1120 }
1121 }
1122 diff_flush(&diff_opts);
1123
1124 return retval;
1125 }
1126
1127 /*
1128 * The blobs of origin and porigin exactly match, so everything
1129 * origin is suspected for can be blamed on the parent.
1130 */
1131 static void pass_whole_blame(struct scoreboard *sb,
1132 struct origin *origin, struct origin *porigin)
1133 {
1134 struct blame_entry *e;
1135
1136 if (!porigin->file.ptr && origin->file.ptr) {
1137 /* Steal its file */
1138 porigin->file = origin->file;
1139 origin->file.ptr = NULL;
1140 }
1141 for (e = sb->ent; e; e = e->next) {
1142 if (cmp_suspect(e->suspect, origin))
1143 continue;
1144 origin_incref(porigin);
1145 origin_decref(e->suspect);
1146 e->suspect = porigin;
1147 }
1148 }
1149
1150 #define MAXPARENT 16
1151
1152 static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
1153 {
1154 int i, pass;
1155 struct commit *commit = origin->commit;
1156 struct commit_list *parent;
1157 struct origin *parent_origin[MAXPARENT], *porigin;
1158
1159 memset(parent_origin, 0, sizeof(parent_origin));
1160
1161 /* The first pass looks for unrenamed path to optimize for
1162 * common cases, then we look for renames in the second pass.
1163 */
1164 for (pass = 0; pass < 2; pass++) {
1165 struct origin *(*find)(struct scoreboard *,
1166 struct commit *, struct origin *);
1167 find = pass ? find_rename : find_origin;
1168
1169 for (i = 0, parent = commit->parents;
1170 i < MAXPARENT && parent;
1171 parent = parent->next, i++) {
1172 struct commit *p = parent->item;
1173 int j, same;
1174
1175 if (parent_origin[i])
1176 continue;
1177 if (parse_commit(p))
1178 continue;
1179 porigin = find(sb, p, origin);
1180 if (!porigin)
1181 continue;
1182 if (!hashcmp(porigin->blob_sha1, origin->blob_sha1)) {
1183 pass_whole_blame(sb, origin, porigin);
1184 origin_decref(porigin);
1185 goto finish;
1186 }
1187 for (j = same = 0; j < i; j++)
1188 if (parent_origin[j] &&
1189 !hashcmp(parent_origin[j]->blob_sha1,
1190 porigin->blob_sha1)) {
1191 same = 1;
1192 break;
1193 }
1194 if (!same)
1195 parent_origin[i] = porigin;
1196 else
1197 origin_decref(porigin);
1198 }
1199 }
1200
1201 num_commits++;
1202 for (i = 0, parent = commit->parents;
1203 i < MAXPARENT && parent;
1204 parent = parent->next, i++) {
1205 struct origin *porigin = parent_origin[i];
1206 if (!porigin)
1207 continue;
1208 if (pass_blame_to_parent(sb, origin, porigin))
1209 goto finish;
1210 }
1211
1212 /*
1213 * Optionally find moves in parents' files.
1214 */
1215 if (opt & PICKAXE_BLAME_MOVE)
1216 for (i = 0, parent = commit->parents;
1217 i < MAXPARENT && parent;
1218 parent = parent->next, i++) {
1219 struct origin *porigin = parent_origin[i];
1220 if (!porigin)
1221 continue;
1222 if (find_move_in_parent(sb, origin, porigin))
1223 goto finish;
1224 }
1225
1226 /*
1227 * Optionally find copies from parents' files.
1228 */
1229 if (opt & PICKAXE_BLAME_COPY)
1230 for (i = 0, parent = commit->parents;
1231 i < MAXPARENT && parent;
1232 parent = parent->next, i++) {
1233 struct origin *porigin = parent_origin[i];
1234 if (find_copy_in_parent(sb, origin, parent->item,
1235 porigin, opt))
1236 goto finish;
1237 }
1238
1239 finish:
1240 for (i = 0; i < MAXPARENT; i++)
1241 origin_decref(parent_origin[i]);
1242 }
1243
1244 /*
1245 * Information on commits, used for output.
1246 */
1247 struct commit_info
1248 {
1249 char *author;
1250 char *author_mail;
1251 unsigned long author_time;
1252 char *author_tz;
1253
1254 /* filled only when asked for details */
1255 char *committer;
1256 char *committer_mail;
1257 unsigned long committer_time;
1258 char *committer_tz;
1259
1260 char *summary;
1261 };
1262
1263 /*
1264 * Parse author/committer line in the commit object buffer
1265 */
1266 static void get_ac_line(const char *inbuf, const char *what,
1267 int bufsz, char *person, char **mail,
1268 unsigned long *time, char **tz)
1269 {
1270 int len;
1271 char *tmp, *endp;
1272
1273 tmp = strstr(inbuf, what);
1274 if (!tmp)
1275 goto error_out;
1276 tmp += strlen(what);
1277 endp = strchr(tmp, '\n');
1278 if (!endp)
1279 len = strlen(tmp);
1280 else
1281 len = endp - tmp;
1282 if (bufsz <= len) {
1283 error_out:
1284 /* Ugh */
1285 person = *mail = *tz = "(unknown)";
1286 *time = 0;
1287 return;
1288 }
1289 memcpy(person, tmp, len);
1290
1291 tmp = person;
1292 tmp += len;
1293 *tmp = 0;
1294 while (*tmp != ' ')
1295 tmp--;
1296 *tz = tmp+1;
1297
1298 *tmp = 0;
1299 while (*tmp != ' ')
1300 tmp--;
1301 *time = strtoul(tmp, NULL, 10);
1302
1303 *tmp = 0;
1304 while (*tmp != ' ')
1305 tmp--;
1306 *mail = tmp + 1;
1307 *tmp = 0;
1308 }
1309
1310 static void get_commit_info(struct commit *commit,
1311 struct commit_info *ret,
1312 int detailed)
1313 {
1314 int len;
1315 char *tmp, *endp;
1316 static char author_buf[1024];
1317 static char committer_buf[1024];
1318 static char summary_buf[1024];
1319
1320 /*
1321 * We've operated without save_commit_buffer, so
1322 * we now need to populate them for output.
1323 */
1324 if (!commit->buffer) {
1325 char type[20];
1326 unsigned long size;
1327 commit->buffer =
1328 read_sha1_file(commit->object.sha1, type, &size);
1329 }
1330 ret->author = author_buf;
1331 get_ac_line(commit->buffer, "\nauthor ",
1332 sizeof(author_buf), author_buf, &ret->author_mail,
1333 &ret->author_time, &ret->author_tz);
1334
1335 if (!detailed)
1336 return;
1337
1338 ret->committer = committer_buf;
1339 get_ac_line(commit->buffer, "\ncommitter ",
1340 sizeof(committer_buf), committer_buf, &ret->committer_mail,
1341 &ret->committer_time, &ret->committer_tz);
1342
1343 ret->summary = summary_buf;
1344 tmp = strstr(commit->buffer, "\n\n");
1345 if (!tmp) {
1346 error_out:
1347 sprintf(summary_buf, "(%s)", sha1_to_hex(commit->object.sha1));
1348 return;
1349 }
1350 tmp += 2;
1351 endp = strchr(tmp, '\n');
1352 if (!endp)
1353 endp = tmp + strlen(tmp);
1354 len = endp - tmp;
1355 if (len >= sizeof(summary_buf) || len == 0)
1356 goto error_out;
1357 memcpy(summary_buf, tmp, len);
1358 summary_buf[len] = 0;
1359 }
1360
1361 /*
1362 * To allow LF and other nonportable characters in pathnames,
1363 * they are c-style quoted as needed.
1364 */
1365 static void write_filename_info(const char *path)
1366 {
1367 printf("filename ");
1368 write_name_quoted(NULL, 0, path, 1, stdout);
1369 putchar('\n');
1370 }
1371
1372 /*
1373 * The blame_entry is found to be guilty for the range. Mark it
1374 * as such, and show it in incremental output.
1375 */
1376 static void found_guilty_entry(struct blame_entry *ent)
1377 {
1378 if (ent->guilty)
1379 return;
1380 ent->guilty = 1;
1381 if (incremental) {
1382 struct origin *suspect = ent->suspect;
1383
1384 printf("%s %d %d %d\n",
1385 sha1_to_hex(suspect->commit->object.sha1),
1386 ent->s_lno + 1, ent->lno + 1, ent->num_lines);
1387 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1388 struct commit_info ci;
1389 suspect->commit->object.flags |= METAINFO_SHOWN;
1390 get_commit_info(suspect->commit, &ci, 1);
1391 printf("author %s\n", ci.author);
1392 printf("author-mail %s\n", ci.author_mail);
1393 printf("author-time %lu\n", ci.author_time);
1394 printf("author-tz %s\n", ci.author_tz);
1395 printf("committer %s\n", ci.committer);
1396 printf("committer-mail %s\n", ci.committer_mail);
1397 printf("committer-time %lu\n", ci.committer_time);
1398 printf("committer-tz %s\n", ci.committer_tz);
1399 printf("summary %s\n", ci.summary);
1400 if (suspect->commit->object.flags & UNINTERESTING)
1401 printf("boundary\n");
1402 }
1403 write_filename_info(suspect->path);
1404 }
1405 }
1406
1407 /*
1408 * The main loop -- while the scoreboard has lines whose true origin
1409 * is still unknown, pick one blame_entry, and allow its current
1410 * suspect to pass blames to its parents.
1411 */
1412 static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
1413 {
1414 while (1) {
1415 struct blame_entry *ent;
1416 struct commit *commit;
1417 struct origin *suspect = NULL;
1418
1419 /* find one suspect to break down */
1420 for (ent = sb->ent; !suspect && ent; ent = ent->next)
1421 if (!ent->guilty)
1422 suspect = ent->suspect;
1423 if (!suspect)
1424 return; /* all done */
1425
1426 /*
1427 * We will use this suspect later in the loop,
1428 * so hold onto it in the meantime.
1429 */
1430 origin_incref(suspect);
1431 commit = suspect->commit;
1432 if (!commit->object.parsed)
1433 parse_commit(commit);
1434 if (!(commit->object.flags & UNINTERESTING) &&
1435 !(revs->max_age != -1 && commit->date < revs->max_age))
1436 pass_blame(sb, suspect, opt);
1437 else {
1438 commit->object.flags |= UNINTERESTING;
1439 if (commit->object.parsed)
1440 mark_parents_uninteresting(commit);
1441 }
1442 /* treat root commit as boundary */
1443 if (!commit->parents && !show_root)
1444 commit->object.flags |= UNINTERESTING;
1445
1446 /* Take responsibility for the remaining entries */
1447 for (ent = sb->ent; ent; ent = ent->next)
1448 if (!cmp_suspect(ent->suspect, suspect))
1449 found_guilty_entry(ent);
1450 origin_decref(suspect);
1451
1452 if (DEBUG) /* sanity */
1453 sanity_check_refcnt(sb);
1454 }
1455 }
1456
1457 static const char *format_time(unsigned long time, const char *tz_str,
1458 int show_raw_time)
1459 {
1460 static char time_buf[128];
1461 time_t t = time;
1462 int minutes, tz;
1463 struct tm *tm;
1464
1465 if (show_raw_time) {
1466 sprintf(time_buf, "%lu %s", time, tz_str);
1467 return time_buf;
1468 }
1469
1470 tz = atoi(tz_str);
1471 minutes = tz < 0 ? -tz : tz;
1472 minutes = (minutes / 100)*60 + (minutes % 100);
1473 minutes = tz < 0 ? -minutes : minutes;
1474 t = time + minutes * 60;
1475 tm = gmtime(&t);
1476
1477 strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
1478 strcat(time_buf, tz_str);
1479 return time_buf;
1480 }
1481
1482 #define OUTPUT_ANNOTATE_COMPAT 001
1483 #define OUTPUT_LONG_OBJECT_NAME 002
1484 #define OUTPUT_RAW_TIMESTAMP 004
1485 #define OUTPUT_PORCELAIN 010
1486 #define OUTPUT_SHOW_NAME 020
1487 #define OUTPUT_SHOW_NUMBER 040
1488 #define OUTPUT_SHOW_SCORE 0100
1489
1490 static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent)
1491 {
1492 int cnt;
1493 const char *cp;
1494 struct origin *suspect = ent->suspect;
1495 char hex[41];
1496
1497 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1498 printf("%s%c%d %d %d\n",
1499 hex,
1500 ent->guilty ? ' ' : '*', // purely for debugging
1501 ent->s_lno + 1,
1502 ent->lno + 1,
1503 ent->num_lines);
1504 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1505 struct commit_info ci;
1506 suspect->commit->object.flags |= METAINFO_SHOWN;
1507 get_commit_info(suspect->commit, &ci, 1);
1508 printf("author %s\n", ci.author);
1509 printf("author-mail %s\n", ci.author_mail);
1510 printf("author-time %lu\n", ci.author_time);
1511 printf("author-tz %s\n", ci.author_tz);
1512 printf("committer %s\n", ci.committer);
1513 printf("committer-mail %s\n", ci.committer_mail);
1514 printf("committer-time %lu\n", ci.committer_time);
1515 printf("committer-tz %s\n", ci.committer_tz);
1516 write_filename_info(suspect->path);
1517 printf("summary %s\n", ci.summary);
1518 if (suspect->commit->object.flags & UNINTERESTING)
1519 printf("boundary\n");
1520 }
1521 else if (suspect->commit->object.flags & MORE_THAN_ONE_PATH)
1522 write_filename_info(suspect->path);
1523
1524 cp = nth_line(sb, ent->lno);
1525 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1526 char ch;
1527 if (cnt)
1528 printf("%s %d %d\n", hex,
1529 ent->s_lno + 1 + cnt,
1530 ent->lno + 1 + cnt);
1531 putchar('\t');
1532 do {
1533 ch = *cp++;
1534 putchar(ch);
1535 } while (ch != '\n' &&
1536 cp < sb->final_buf + sb->final_buf_size);
1537 }
1538 }
1539
1540 static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
1541 {
1542 int cnt;
1543 const char *cp;
1544 struct origin *suspect = ent->suspect;
1545 struct commit_info ci;
1546 char hex[41];
1547 int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
1548
1549 get_commit_info(suspect->commit, &ci, 1);
1550 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1551
1552 cp = nth_line(sb, ent->lno);
1553 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1554 char ch;
1555 int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : 8;
1556
1557 if (suspect->commit->object.flags & UNINTERESTING) {
1558 if (blank_boundary)
1559 memset(hex, ' ', length);
1560 else if (!cmd_is_annotate) {
1561 length--;
1562 putchar('^');
1563 }
1564 }
1565
1566 printf("%.*s", length, hex);
1567 if (opt & OUTPUT_ANNOTATE_COMPAT)
1568 printf("\t(%10s\t%10s\t%d)", ci.author,
1569 format_time(ci.author_time, ci.author_tz,
1570 show_raw_time),
1571 ent->lno + 1 + cnt);
1572 else {
1573 if (opt & OUTPUT_SHOW_SCORE)
1574 printf(" %*d %02d",
1575 max_score_digits, ent->score,
1576 ent->suspect->refcnt);
1577 if (opt & OUTPUT_SHOW_NAME)
1578 printf(" %-*.*s", longest_file, longest_file,
1579 suspect->path);
1580 if (opt & OUTPUT_SHOW_NUMBER)
1581 printf(" %*d", max_orig_digits,
1582 ent->s_lno + 1 + cnt);
1583 printf(" (%-*.*s %10s %*d) ",
1584 longest_author, longest_author, ci.author,
1585 format_time(ci.author_time, ci.author_tz,
1586 show_raw_time),
1587 max_digits, ent->lno + 1 + cnt);
1588 }
1589 do {
1590 ch = *cp++;
1591 putchar(ch);
1592 } while (ch != '\n' &&
1593 cp < sb->final_buf + sb->final_buf_size);
1594 }
1595 }
1596
1597 static void output(struct scoreboard *sb, int option)
1598 {
1599 struct blame_entry *ent;
1600
1601 if (option & OUTPUT_PORCELAIN) {
1602 for (ent = sb->ent; ent; ent = ent->next) {
1603 struct blame_entry *oth;
1604 struct origin *suspect = ent->suspect;
1605 struct commit *commit = suspect->commit;
1606 if (commit->object.flags & MORE_THAN_ONE_PATH)
1607 continue;
1608 for (oth = ent->next; oth; oth = oth->next) {
1609 if ((oth->suspect->commit != commit) ||
1610 !strcmp(oth->suspect->path, suspect->path))
1611 continue;
1612 commit->object.flags |= MORE_THAN_ONE_PATH;
1613 break;
1614 }
1615 }
1616 }
1617
1618 for (ent = sb->ent; ent; ent = ent->next) {
1619 if (option & OUTPUT_PORCELAIN)
1620 emit_porcelain(sb, ent);
1621 else {
1622 emit_other(sb, ent, option);
1623 }
1624 }
1625 }
1626
1627 /*
1628 * To allow quick access to the contents of nth line in the
1629 * final image, prepare an index in the scoreboard.
1630 */
1631 static int prepare_lines(struct scoreboard *sb)
1632 {
1633 const char *buf = sb->final_buf;
1634 unsigned long len = sb->final_buf_size;
1635 int num = 0, incomplete = 0, bol = 1;
1636
1637 if (len && buf[len-1] != '\n')
1638 incomplete++; /* incomplete line at the end */
1639 while (len--) {
1640 if (bol) {
1641 sb->lineno = xrealloc(sb->lineno,
1642 sizeof(int* ) * (num + 1));
1643 sb->lineno[num] = buf - sb->final_buf;
1644 bol = 0;
1645 }
1646 if (*buf++ == '\n') {
1647 num++;
1648 bol = 1;
1649 }
1650 }
1651 sb->lineno = xrealloc(sb->lineno,
1652 sizeof(int* ) * (num + incomplete + 1));
1653 sb->lineno[num + incomplete] = buf - sb->final_buf;
1654 sb->num_lines = num + incomplete;
1655 return sb->num_lines;
1656 }
1657
1658 /*
1659 * Add phony grafts for use with -S; this is primarily to
1660 * support git-cvsserver that wants to give a linear history
1661 * to its clients.
1662 */
1663 static int read_ancestry(const char *graft_file)
1664 {
1665 FILE *fp = fopen(graft_file, "r");
1666 char buf[1024];
1667 if (!fp)
1668 return -1;
1669 while (fgets(buf, sizeof(buf), fp)) {
1670 /* The format is just "Commit Parent1 Parent2 ...\n" */
1671 int len = strlen(buf);
1672 struct commit_graft *graft = read_graft_line(buf, len);
1673 if (graft)
1674 register_commit_graft(graft, 0);
1675 }
1676 fclose(fp);
1677 return 0;
1678 }
1679
1680 /*
1681 * How many columns do we need to show line numbers in decimal?
1682 */
1683 static int lineno_width(int lines)
1684 {
1685 int i, width;
1686
1687 for (width = 1, i = 10; i <= lines + 1; width++)
1688 i *= 10;
1689 return width;
1690 }
1691
1692 /*
1693 * How many columns do we need to show line numbers, authors,
1694 * and filenames?
1695 */
1696 static void find_alignment(struct scoreboard *sb, int *option)
1697 {
1698 int longest_src_lines = 0;
1699 int longest_dst_lines = 0;
1700 unsigned largest_score = 0;
1701 struct blame_entry *e;
1702
1703 for (e = sb->ent; e; e = e->next) {
1704 struct origin *suspect = e->suspect;
1705 struct commit_info ci;
1706 int num;
1707
1708 if (strcmp(suspect->path, sb->path))
1709 *option |= OUTPUT_SHOW_NAME;
1710 num = strlen(suspect->path);
1711 if (longest_file < num)
1712 longest_file = num;
1713 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1714 suspect->commit->object.flags |= METAINFO_SHOWN;
1715 get_commit_info(suspect->commit, &ci, 1);
1716 num = strlen(ci.author);
1717 if (longest_author < num)
1718 longest_author = num;
1719 }
1720 num = e->s_lno + e->num_lines;
1721 if (longest_src_lines < num)
1722 longest_src_lines = num;
1723 num = e->lno + e->num_lines;
1724 if (longest_dst_lines < num)
1725 longest_dst_lines = num;
1726 if (largest_score < ent_score(sb, e))
1727 largest_score = ent_score(sb, e);
1728 }
1729 max_orig_digits = lineno_width(longest_src_lines);
1730 max_digits = lineno_width(longest_dst_lines);
1731 max_score_digits = lineno_width(largest_score);
1732 }
1733
1734 /*
1735 * For debugging -- origin is refcounted, and this asserts that
1736 * we do not underflow.
1737 */
1738 static void sanity_check_refcnt(struct scoreboard *sb)
1739 {
1740 int baa = 0;
1741 struct blame_entry *ent;
1742
1743 for (ent = sb->ent; ent; ent = ent->next) {
1744 /* Nobody should have zero or negative refcnt */
1745 if (ent->suspect->refcnt <= 0) {
1746 fprintf(stderr, "%s in %s has negative refcnt %d\n",
1747 ent->suspect->path,
1748 sha1_to_hex(ent->suspect->commit->object.sha1),
1749 ent->suspect->refcnt);
1750 baa = 1;
1751 }
1752 }
1753 for (ent = sb->ent; ent; ent = ent->next) {
1754 /* Mark the ones that haven't been checked */
1755 if (0 < ent->suspect->refcnt)
1756 ent->suspect->refcnt = -ent->suspect->refcnt;
1757 }
1758 for (ent = sb->ent; ent; ent = ent->next) {
1759 /*
1760 * ... then pick each and see if they have the the
1761 * correct refcnt.
1762 */
1763 int found;
1764 struct blame_entry *e;
1765 struct origin *suspect = ent->suspect;
1766
1767 if (0 < suspect->refcnt)
1768 continue;
1769 suspect->refcnt = -suspect->refcnt; /* Unmark */
1770 for (found = 0, e = sb->ent; e; e = e->next) {
1771 if (e->suspect != suspect)
1772 continue;
1773 found++;
1774 }
1775 if (suspect->refcnt != found) {
1776 fprintf(stderr, "%s in %s has refcnt %d, not %d\n",
1777 ent->suspect->path,
1778 sha1_to_hex(ent->suspect->commit->object.sha1),
1779 ent->suspect->refcnt, found);
1780 baa = 2;
1781 }
1782 }
1783 if (baa) {
1784 int opt = 0160;
1785 find_alignment(sb, &opt);
1786 output(sb, opt);
1787 die("Baa %d!", baa);
1788 }
1789 }
1790
1791 /*
1792 * Used for the command line parsing; check if the path exists
1793 * in the working tree.
1794 */
1795 static int has_path_in_work_tree(const char *path)
1796 {
1797 struct stat st;
1798 return !lstat(path, &st);
1799 }
1800
1801 static unsigned parse_score(const char *arg)
1802 {
1803 char *end;
1804 unsigned long score = strtoul(arg, &end, 10);
1805 if (*end)
1806 return 0;
1807 return score;
1808 }
1809
1810 static const char *add_prefix(const char *prefix, const char *path)
1811 {
1812 if (!prefix || !prefix[0])
1813 return path;
1814 return prefix_path(prefix, strlen(prefix), path);
1815 }
1816
1817 /*
1818 * Parsing of (comma separated) one item in the -L option
1819 */
1820 static const char *parse_loc(const char *spec,
1821 struct scoreboard *sb, long lno,
1822 long begin, long *ret)
1823 {
1824 char *term;
1825 const char *line;
1826 long num;
1827 int reg_error;
1828 regex_t regexp;
1829 regmatch_t match[1];
1830
1831 /* Allow "-L <something>,+20" to mean starting at <something>
1832 * for 20 lines, or "-L <something>,-5" for 5 lines ending at
1833 * <something>.
1834 */
1835 if (1 < begin && (spec[0] == '+' || spec[0] == '-')) {
1836 num = strtol(spec + 1, &term, 10);
1837 if (term != spec + 1) {
1838 if (spec[0] == '-')
1839 num = 0 - num;
1840 if (0 < num)
1841 *ret = begin + num - 2;
1842 else if (!num)
1843 *ret = begin;
1844 else
1845 *ret = begin + num;
1846 return term;
1847 }
1848 return spec;
1849 }
1850 num = strtol(spec, &term, 10);
1851 if (term != spec) {
1852 *ret = num;
1853 return term;
1854 }
1855 if (spec[0] != '/')
1856 return spec;
1857
1858 /* it could be a regexp of form /.../ */
1859 for (term = (char*) spec + 1; *term && *term != '/'; term++) {
1860 if (*term == '\\')
1861 term++;
1862 }
1863 if (*term != '/')
1864 return spec;
1865
1866 /* try [spec+1 .. term-1] as regexp */
1867 *term = 0;
1868 begin--; /* input is in human terms */
1869 line = nth_line(sb, begin);
1870
1871 if (!(reg_error = regcomp(&regexp, spec + 1, REG_NEWLINE)) &&
1872 !(reg_error = regexec(&regexp, line, 1, match, 0))) {
1873 const char *cp = line + match[0].rm_so;
1874 const char *nline;
1875
1876 while (begin++ < lno) {
1877 nline = nth_line(sb, begin);
1878 if (line <= cp && cp < nline)
1879 break;
1880 line = nline;
1881 }
1882 *ret = begin;
1883 regfree(&regexp);
1884 *term++ = '/';
1885 return term;
1886 }
1887 else {
1888 char errbuf[1024];
1889 regerror(reg_error, &regexp, errbuf, 1024);
1890 die("-L parameter '%s': %s", spec + 1, errbuf);
1891 }
1892 }
1893
1894 /*
1895 * Parsing of -L option
1896 */
1897 static void prepare_blame_range(struct scoreboard *sb,
1898 const char *bottomtop,
1899 long lno,
1900 long *bottom, long *top)
1901 {
1902 const char *term;
1903
1904 term = parse_loc(bottomtop, sb, lno, 1, bottom);
1905 if (*term == ',') {
1906 term = parse_loc(term + 1, sb, lno, *bottom + 1, top);
1907 if (*term)
1908 usage(blame_usage);
1909 }
1910 if (*term)
1911 usage(blame_usage);
1912 }
1913
1914 static int git_blame_config(const char *var, const char *value)
1915 {
1916 if (!strcmp(var, "blame.showroot")) {
1917 show_root = git_config_bool(var, value);
1918 return 0;
1919 }
1920 if (!strcmp(var, "blame.blankboundary")) {
1921 blank_boundary = git_config_bool(var, value);
1922 return 0;
1923 }
1924 return git_default_config(var, value);
1925 }
1926
1927 static struct commit *fake_working_tree_commit(const char *path, const char *contents_from)
1928 {
1929 struct commit *commit;
1930 struct origin *origin;
1931 unsigned char head_sha1[20];
1932 char *buf;
1933 const char *ident;
1934 int fd;
1935 time_t now;
1936 unsigned long fin_size;
1937 int size, len;
1938 struct cache_entry *ce;
1939 unsigned mode;
1940
1941 if (get_sha1("HEAD", head_sha1))
1942 die("No such ref: HEAD");
1943
1944 time(&now);
1945 commit = xcalloc(1, sizeof(*commit));
1946 commit->parents = xcalloc(1, sizeof(*commit->parents));
1947 commit->parents->item = lookup_commit_reference(head_sha1);
1948 commit->object.parsed = 1;
1949 commit->date = now;
1950 commit->object.type = OBJ_COMMIT;
1951
1952 origin = make_origin(commit, path);
1953
1954 if (!contents_from || strcmp("-", contents_from)) {
1955 struct stat st;
1956 const char *read_from;
1957
1958 if (contents_from) {
1959 if (stat(contents_from, &st) < 0)
1960 die("Cannot stat %s", contents_from);
1961 read_from = contents_from;
1962 }
1963 else {
1964 if (lstat(path, &st) < 0)
1965 die("Cannot lstat %s", path);
1966 read_from = path;
1967 }
1968 fin_size = st.st_size;
1969 buf = xmalloc(fin_size+1);
1970 mode = canon_mode(st.st_mode);
1971 switch (st.st_mode & S_IFMT) {
1972 case S_IFREG:
1973 fd = open(read_from, O_RDONLY);
1974 if (fd < 0)
1975 die("cannot open %s", read_from);
1976 if (read_in_full(fd, buf, fin_size) != fin_size)
1977 die("cannot read %s", read_from);
1978 break;
1979 case S_IFLNK:
1980 if (readlink(read_from, buf, fin_size+1) != fin_size)
1981 die("cannot readlink %s", read_from);
1982 break;
1983 default:
1984 die("unsupported file type %s", read_from);
1985 }
1986 }
1987 else {
1988 /* Reading from stdin */
1989 contents_from = "standard input";
1990 buf = NULL;
1991 fin_size = 0;
1992 mode = 0;
1993 while (1) {
1994 ssize_t cnt = 8192;
1995 buf = xrealloc(buf, fin_size + cnt);
1996 cnt = xread(0, buf + fin_size, cnt);
1997 if (cnt < 0)
1998 die("read error %s from stdin",
1999 strerror(errno));
2000 if (!cnt)
2001 break;
2002 fin_size += cnt;
2003 }
2004 buf = xrealloc(buf, fin_size + 1);
2005 }
2006 buf[fin_size] = 0;
2007 origin->file.ptr = buf;
2008 origin->file.size = fin_size;
2009 pretend_sha1_file(buf, fin_size, blob_type, origin->blob_sha1);
2010 commit->util = origin;
2011
2012 /*
2013 * Read the current index, replace the path entry with
2014 * origin->blob_sha1 without mucking with its mode or type
2015 * bits; we are not going to write this index out -- we just
2016 * want to run "diff-index --cached".
2017 */
2018 discard_cache();
2019 read_cache();
2020
2021 len = strlen(path);
2022 if (!mode) {
2023 int pos = cache_name_pos(path, len);
2024 if (0 <= pos)
2025 mode = ntohl(active_cache[pos]->ce_mode);
2026 else
2027 /* Let's not bother reading from HEAD tree */
2028 mode = S_IFREG | 0644;
2029 }
2030 size = cache_entry_size(len);
2031 ce = xcalloc(1, size);
2032 hashcpy(ce->sha1, origin->blob_sha1);
2033 memcpy(ce->name, path, len);
2034 ce->ce_flags = create_ce_flags(len, 0);
2035 ce->ce_mode = create_ce_mode(mode);
2036 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
2037
2038 /*
2039 * We are not going to write this out, so this does not matter
2040 * right now, but someday we might optimize diff-index --cached
2041 * with cache-tree information.
2042 */
2043 cache_tree_invalidate_path(active_cache_tree, path);
2044
2045 commit->buffer = xmalloc(400);
2046 ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
2047 sprintf(commit->buffer,
2048 "tree 0000000000000000000000000000000000000000\n"
2049 "parent %s\n"
2050 "author %s\n"
2051 "committer %s\n\n"
2052 "Version of %s from %s\n",
2053 sha1_to_hex(head_sha1),
2054 ident, ident, path, contents_from ? contents_from : path);
2055 return commit;
2056 }
2057
2058 int cmd_blame(int argc, const char **argv, const char *prefix)
2059 {
2060 struct rev_info revs;
2061 const char *path;
2062 struct scoreboard sb;
2063 struct origin *o;
2064 struct blame_entry *ent;
2065 int i, seen_dashdash, unk, opt;
2066 long bottom, top, lno;
2067 int output_option = 0;
2068 int show_stats = 0;
2069 const char *revs_file = NULL;
2070 const char *final_commit_name = NULL;
2071 char type[10];
2072 const char *bottomtop = NULL;
2073 const char *contents_from = NULL;
2074
2075 cmd_is_annotate = !strcmp(argv[0], "annotate");
2076
2077 git_config(git_blame_config);
2078 save_commit_buffer = 0;
2079
2080 opt = 0;
2081 seen_dashdash = 0;
2082 for (unk = i = 1; i < argc; i++) {
2083 const char *arg = argv[i];
2084 if (*arg != '-')
2085 break;
2086 else if (!strcmp("-b", arg))
2087 blank_boundary = 1;
2088 else if (!strcmp("--root", arg))
2089 show_root = 1;
2090 else if (!strcmp(arg, "--show-stats"))
2091 show_stats = 1;
2092 else if (!strcmp("-c", arg))
2093 output_option |= OUTPUT_ANNOTATE_COMPAT;
2094 else if (!strcmp("-t", arg))
2095 output_option |= OUTPUT_RAW_TIMESTAMP;
2096 else if (!strcmp("-l", arg))
2097 output_option |= OUTPUT_LONG_OBJECT_NAME;
2098 else if (!strcmp("-S", arg) && ++i < argc)
2099 revs_file = argv[i];
2100 else if (!prefixcmp(arg, "-M")) {
2101 opt |= PICKAXE_BLAME_MOVE;
2102 blame_move_score = parse_score(arg+2);
2103 }
2104 else if (!prefixcmp(arg, "-C")) {
2105 if (opt & PICKAXE_BLAME_COPY)
2106 opt |= PICKAXE_BLAME_COPY_HARDER;
2107 opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
2108 blame_copy_score = parse_score(arg+2);
2109 }
2110 else if (!prefixcmp(arg, "-L")) {
2111 if (!arg[2]) {
2112 if (++i >= argc)
2113 usage(blame_usage);
2114 arg = argv[i];
2115 }
2116 else
2117 arg += 2;
2118 if (bottomtop)
2119 die("More than one '-L n,m' option given");
2120 bottomtop = arg;
2121 }
2122 else if (!strcmp("--contents", arg)) {
2123 if (++i >= argc)
2124 usage(blame_usage);
2125 contents_from = argv[i];
2126 }
2127 else if (!strcmp("--incremental", arg))
2128 incremental = 1;
2129 else if (!strcmp("--score-debug", arg))
2130 output_option |= OUTPUT_SHOW_SCORE;
2131 else if (!strcmp("-f", arg) ||
2132 !strcmp("--show-name", arg))
2133 output_option |= OUTPUT_SHOW_NAME;
2134 else if (!strcmp("-n", arg) ||
2135 !strcmp("--show-number", arg))
2136 output_option |= OUTPUT_SHOW_NUMBER;
2137 else if (!strcmp("-p", arg) ||
2138 !strcmp("--porcelain", arg))
2139 output_option |= OUTPUT_PORCELAIN;
2140 else if (!strcmp("--", arg)) {
2141 seen_dashdash = 1;
2142 i++;
2143 break;
2144 }
2145 else
2146 argv[unk++] = arg;
2147 }
2148
2149 if (!incremental)
2150 setup_pager();
2151
2152 if (!blame_move_score)
2153 blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
2154 if (!blame_copy_score)
2155 blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
2156
2157 /*
2158 * We have collected options unknown to us in argv[1..unk]
2159 * which are to be passed to revision machinery if we are
2160 * going to do the "bottom" processing.
2161 *
2162 * The remaining are:
2163 *
2164 * (1) if seen_dashdash, its either
2165 * "-options -- <path>" or
2166 * "-options -- <path> <rev>".
2167 * but the latter is allowed only if there is no
2168 * options that we passed to revision machinery.
2169 *
2170 * (2) otherwise, we may have "--" somewhere later and
2171 * might be looking at the first one of multiple 'rev'
2172 * parameters (e.g. " master ^next ^maint -- path").
2173 * See if there is a dashdash first, and give the
2174 * arguments before that to revision machinery.
2175 * After that there must be one 'path'.
2176 *
2177 * (3) otherwise, its one of the three:
2178 * "-options <path> <rev>"
2179 * "-options <rev> <path>"
2180 * "-options <path>"
2181 * but again the first one is allowed only if
2182 * there is no options that we passed to revision
2183 * machinery.
2184 */
2185
2186 if (seen_dashdash) {
2187 /* (1) */
2188 if (argc <= i)
2189 usage(blame_usage);
2190 path = add_prefix(prefix, argv[i]);
2191 if (i + 1 == argc - 1) {
2192 if (unk != 1)
2193 usage(blame_usage);
2194 argv[unk++] = argv[i + 1];
2195 }
2196 else if (i + 1 != argc)
2197 /* garbage at end */
2198 usage(blame_usage);
2199 }
2200 else {
2201 int j;
2202 for (j = i; !seen_dashdash && j < argc; j++)
2203 if (!strcmp(argv[j], "--"))
2204 seen_dashdash = j;
2205 if (seen_dashdash) {
2206 /* (2) */
2207 if (seen_dashdash + 1 != argc - 1)
2208 usage(blame_usage);
2209 path = add_prefix(prefix, argv[seen_dashdash + 1]);
2210 for (j = i; j < seen_dashdash; j++)
2211 argv[unk++] = argv[j];
2212 }
2213 else {
2214 /* (3) */
2215 if (argc <= i)
2216 usage(blame_usage);
2217 path = add_prefix(prefix, argv[i]);
2218 if (i + 1 == argc - 1) {
2219 final_commit_name = argv[i + 1];
2220
2221 /* if (unk == 1) we could be getting
2222 * old-style
2223 */
2224 if (unk == 1 && !has_path_in_work_tree(path)) {
2225 path = add_prefix(prefix, argv[i + 1]);
2226 final_commit_name = argv[i];
2227 }
2228 }
2229 else if (i != argc - 1)
2230 usage(blame_usage); /* garbage at end */
2231
2232 if (!has_path_in_work_tree(path))
2233 die("cannot stat path %s: %s",
2234 path, strerror(errno));
2235 }
2236 }
2237
2238 if (final_commit_name)
2239 argv[unk++] = final_commit_name;
2240
2241 /*
2242 * Now we got rev and path. We do not want the path pruning
2243 * but we may want "bottom" processing.
2244 */
2245 argv[unk++] = "--"; /* terminate the rev name */
2246 argv[unk] = NULL;
2247
2248 init_revisions(&revs, NULL);
2249 setup_revisions(unk, argv, &revs, NULL);
2250 memset(&sb, 0, sizeof(sb));
2251
2252 /*
2253 * There must be one and only one positive commit in the
2254 * revs->pending array.
2255 */
2256 for (i = 0; i < revs.pending.nr; i++) {
2257 struct object *obj = revs.pending.objects[i].item;
2258 if (obj->flags & UNINTERESTING)
2259 continue;
2260 while (obj->type == OBJ_TAG)
2261 obj = deref_tag(obj, NULL, 0);
2262 if (obj->type != OBJ_COMMIT)
2263 die("Non commit %s?",
2264 revs.pending.objects[i].name);
2265 if (sb.final)
2266 die("More than one commit to dig from %s and %s?",
2267 revs.pending.objects[i].name,
2268 final_commit_name);
2269 sb.final = (struct commit *) obj;
2270 final_commit_name = revs.pending.objects[i].name;
2271 }
2272
2273 if (!sb.final) {
2274 /*
2275 * "--not A B -- path" without anything positive;
2276 * do not default to HEAD, but use the working tree
2277 * or "--contents".
2278 */
2279 sb.final = fake_working_tree_commit(path, contents_from);
2280 add_pending_object(&revs, &(sb.final->object), ":");
2281 }
2282 else if (contents_from)
2283 die("Cannot use --contents with final commit object name");
2284
2285 /*
2286 * If we have bottom, this will mark the ancestors of the
2287 * bottom commits we would reach while traversing as
2288 * uninteresting.
2289 */
2290 prepare_revision_walk(&revs);
2291
2292 if (is_null_sha1(sb.final->object.sha1)) {
2293 char *buf;
2294 o = sb.final->util;
2295 buf = xmalloc(o->file.size + 1);
2296 memcpy(buf, o->file.ptr, o->file.size + 1);
2297 sb.final_buf = buf;
2298 sb.final_buf_size = o->file.size;
2299 }
2300 else {
2301 o = get_origin(&sb, sb.final, path);
2302 if (fill_blob_sha1(o))
2303 die("no such path %s in %s", path, final_commit_name);
2304
2305 sb.final_buf = read_sha1_file(o->blob_sha1, type,
2306 &sb.final_buf_size);
2307 }
2308 num_read_blob++;
2309 lno = prepare_lines(&sb);
2310
2311 bottom = top = 0;
2312 if (bottomtop)
2313 prepare_blame_range(&sb, bottomtop, lno, &bottom, &top);
2314 if (bottom && top && top < bottom) {
2315 long tmp;
2316 tmp = top; top = bottom; bottom = tmp;
2317 }
2318 if (bottom < 1)
2319 bottom = 1;
2320 if (top < 1)
2321 top = lno;
2322 bottom--;
2323 if (lno < top)
2324 die("file %s has only %lu lines", path, lno);
2325
2326 ent = xcalloc(1, sizeof(*ent));
2327 ent->lno = bottom;
2328 ent->num_lines = top - bottom;
2329 ent->suspect = o;
2330 ent->s_lno = bottom;
2331
2332 sb.ent = ent;
2333 sb.path = path;
2334
2335 if (revs_file && read_ancestry(revs_file))
2336 die("reading graft file %s failed: %s",
2337 revs_file, strerror(errno));
2338
2339 assign_blame(&sb, &revs, opt);
2340
2341 if (incremental)
2342 return 0;
2343
2344 coalesce(&sb);
2345
2346 if (!(output_option & OUTPUT_PORCELAIN))
2347 find_alignment(&sb, &output_option);
2348
2349 output(&sb, output_option);
2350 free((void *)sb.final_buf);
2351 for (ent = sb.ent; ent; ) {
2352 struct blame_entry *e = ent->next;
2353 free(ent);
2354 ent = e;
2355 }
2356
2357 if (show_stats) {
2358 printf("num read blob: %d\n", num_read_blob);
2359 printf("num get patch: %d\n", num_get_patch);
2360 printf("num commits: %d\n", num_commits);
2361 }
2362 return 0;
2363 }
git for Debian