git-diff: squelch "empty" diffs
[git/repo.git] / builtin-blame.c
blob0519339098f3258ae6cc2b50d30679a8cfc7f2c7
1 /*
2 * Pickaxe
4 * Copyright (c) 2006, Junio C Hamano
5 */
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 "path-list.h"
20 #include "mailmap.h"
22 static char blame_usage[] =
23 "git-blame [-c] [-b] [-l] [--root] [-t] [-f] [-n] [-s] [-p] [-w] [-L n,m] [-S <revs-file>] [-M] [-C] [-C] [--contents <filename>] [--incremental] [commit] [--] file\n"
24 " -c Use the same output mode as git-annotate (Default: off)\n"
25 " -b Show blank SHA-1 for boundary commits (Default: off)\n"
26 " -l Show long commit SHA1 (Default: off)\n"
27 " --root Do not treat root commits as boundaries (Default: off)\n"
28 " -t Show raw timestamp (Default: off)\n"
29 " -f, --show-name Show original filename (Default: auto)\n"
30 " -n, --show-number Show original linenumber (Default: off)\n"
31 " -s Suppress author name and timestamp (Default: off)\n"
32 " -p, --porcelain Show in a format designed for machine consumption\n"
33 " -w Ignore whitespace differences\n"
34 " -L n,m Process only line range n,m, counting from 1\n"
35 " -M, -C Find line movements within and across files\n"
36 " --incremental Show blame entries as we find them, incrementally\n"
37 " --contents file Use <file>'s contents as the final image\n"
38 " -S revs-file Use revisions from revs-file instead of calling git-rev-list\n";
40 static int longest_file;
41 static int longest_author;
42 static int max_orig_digits;
43 static int max_digits;
44 static int max_score_digits;
45 static int show_root;
46 static int blank_boundary;
47 static int incremental;
48 static int cmd_is_annotate;
49 static int xdl_opts = XDF_NEED_MINIMAL;
50 static struct path_list mailmap;
52 #ifndef DEBUG
53 #define DEBUG 0
54 #endif
56 /* stats */
57 static int num_read_blob;
58 static int num_get_patch;
59 static int num_commits;
61 #define PICKAXE_BLAME_MOVE 01
62 #define PICKAXE_BLAME_COPY 02
63 #define PICKAXE_BLAME_COPY_HARDER 04
64 #define PICKAXE_BLAME_COPY_HARDEST 010
67 * blame for a blame_entry with score lower than these thresholds
68 * is not passed to the parent using move/copy logic.
70 static unsigned blame_move_score;
71 static unsigned blame_copy_score;
72 #define BLAME_DEFAULT_MOVE_SCORE 20
73 #define BLAME_DEFAULT_COPY_SCORE 40
75 /* bits #0..7 in revision.h, #8..11 used for merge_bases() in commit.c */
76 #define METAINFO_SHOWN (1u<<12)
77 #define MORE_THAN_ONE_PATH (1u<<13)
80 * One blob in a commit that is being suspected
82 struct origin {
83 int refcnt;
84 struct commit *commit;
85 mmfile_t file;
86 unsigned char blob_sha1[20];
87 char path[FLEX_ARRAY];
91 * Given an origin, prepare mmfile_t structure to be used by the
92 * diff machinery
94 static char *fill_origin_blob(struct origin *o, mmfile_t *file)
96 if (!o->file.ptr) {
97 enum object_type type;
98 num_read_blob++;
99 file->ptr = read_sha1_file(o->blob_sha1, &type,
100 (unsigned long *)(&(file->size)));
101 o->file = *file;
103 else
104 *file = o->file;
105 return file->ptr;
109 * Origin is refcounted and usually we keep the blob contents to be
110 * reused.
112 static inline struct origin *origin_incref(struct origin *o)
114 if (o)
115 o->refcnt++;
116 return o;
119 static void origin_decref(struct origin *o)
121 if (o && --o->refcnt <= 0) {
122 if (o->file.ptr)
123 free(o->file.ptr);
124 memset(o, 0, sizeof(*o));
125 free(o);
130 * Each group of lines is described by a blame_entry; it can be split
131 * as we pass blame to the parents. They form a linked list in the
132 * scoreboard structure, sorted by the target line number.
134 struct blame_entry {
135 struct blame_entry *prev;
136 struct blame_entry *next;
138 /* the first line of this group in the final image;
139 * internally all line numbers are 0 based.
141 int lno;
143 /* how many lines this group has */
144 int num_lines;
146 /* the commit that introduced this group into the final image */
147 struct origin *suspect;
149 /* true if the suspect is truly guilty; false while we have not
150 * checked if the group came from one of its parents.
152 char guilty;
154 /* the line number of the first line of this group in the
155 * suspect's file; internally all line numbers are 0 based.
157 int s_lno;
159 /* how significant this entry is -- cached to avoid
160 * scanning the lines over and over.
162 unsigned score;
166 * The current state of the blame assignment.
168 struct scoreboard {
169 /* the final commit (i.e. where we started digging from) */
170 struct commit *final;
172 const char *path;
175 * The contents in the final image.
176 * Used by many functions to obtain contents of the nth line,
177 * indexed with scoreboard.lineno[blame_entry.lno].
179 const char *final_buf;
180 unsigned long final_buf_size;
182 /* linked list of blames */
183 struct blame_entry *ent;
185 /* look-up a line in the final buffer */
186 int num_lines;
187 int *lineno;
190 static inline int same_suspect(struct origin *a, struct origin *b)
192 if (a == b)
193 return 1;
194 if (a->commit != b->commit)
195 return 0;
196 return !strcmp(a->path, b->path);
199 static void sanity_check_refcnt(struct scoreboard *);
202 * If two blame entries that are next to each other came from
203 * contiguous lines in the same origin (i.e. <commit, path> pair),
204 * merge them together.
206 static void coalesce(struct scoreboard *sb)
208 struct blame_entry *ent, *next;
210 for (ent = sb->ent; ent && (next = ent->next); ent = next) {
211 if (same_suspect(ent->suspect, next->suspect) &&
212 ent->guilty == next->guilty &&
213 ent->s_lno + ent->num_lines == next->s_lno) {
214 ent->num_lines += next->num_lines;
215 ent->next = next->next;
216 if (ent->next)
217 ent->next->prev = ent;
218 origin_decref(next->suspect);
219 free(next);
220 ent->score = 0;
221 next = ent; /* again */
225 if (DEBUG) /* sanity */
226 sanity_check_refcnt(sb);
230 * Given a commit and a path in it, create a new origin structure.
231 * The callers that add blame to the scoreboard should use
232 * get_origin() to obtain shared, refcounted copy instead of calling
233 * this function directly.
235 static struct origin *make_origin(struct commit *commit, const char *path)
237 struct origin *o;
238 o = xcalloc(1, sizeof(*o) + strlen(path) + 1);
239 o->commit = commit;
240 o->refcnt = 1;
241 strcpy(o->path, path);
242 return o;
246 * Locate an existing origin or create a new one.
248 static struct origin *get_origin(struct scoreboard *sb,
249 struct commit *commit,
250 const char *path)
252 struct blame_entry *e;
254 for (e = sb->ent; e; e = e->next) {
255 if (e->suspect->commit == commit &&
256 !strcmp(e->suspect->path, path))
257 return origin_incref(e->suspect);
259 return make_origin(commit, path);
263 * Fill the blob_sha1 field of an origin if it hasn't, so that later
264 * call to fill_origin_blob() can use it to locate the data. blob_sha1
265 * for an origin is also used to pass the blame for the entire file to
266 * the parent to detect the case where a child's blob is identical to
267 * that of its parent's.
269 static int fill_blob_sha1(struct origin *origin)
271 unsigned mode;
273 if (!is_null_sha1(origin->blob_sha1))
274 return 0;
275 if (get_tree_entry(origin->commit->object.sha1,
276 origin->path,
277 origin->blob_sha1, &mode))
278 goto error_out;
279 if (sha1_object_info(origin->blob_sha1, NULL) != OBJ_BLOB)
280 goto error_out;
281 return 0;
282 error_out:
283 hashclr(origin->blob_sha1);
284 return -1;
288 * We have an origin -- check if the same path exists in the
289 * parent and return an origin structure to represent it.
291 static struct origin *find_origin(struct scoreboard *sb,
292 struct commit *parent,
293 struct origin *origin)
295 struct origin *porigin = NULL;
296 struct diff_options diff_opts;
297 const char *paths[2];
299 if (parent->util) {
301 * Each commit object can cache one origin in that
302 * commit. This is a freestanding copy of origin and
303 * not refcounted.
305 struct origin *cached = parent->util;
306 if (!strcmp(cached->path, origin->path)) {
308 * The same path between origin and its parent
309 * without renaming -- the most common case.
311 porigin = get_origin(sb, parent, cached->path);
314 * If the origin was newly created (i.e. get_origin
315 * would call make_origin if none is found in the
316 * scoreboard), it does not know the blob_sha1,
317 * so copy it. Otherwise porigin was in the
318 * scoreboard and already knows blob_sha1.
320 if (porigin->refcnt == 1)
321 hashcpy(porigin->blob_sha1, cached->blob_sha1);
322 return porigin;
324 /* otherwise it was not very useful; free it */
325 free(parent->util);
326 parent->util = NULL;
329 /* See if the origin->path is different between parent
330 * and origin first. Most of the time they are the
331 * same and diff-tree is fairly efficient about this.
333 diff_setup(&diff_opts);
334 diff_opts.recursive = 1;
335 diff_opts.detect_rename = 0;
336 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
337 paths[0] = origin->path;
338 paths[1] = NULL;
340 diff_tree_setup_paths(paths, &diff_opts);
341 if (diff_setup_done(&diff_opts) < 0)
342 die("diff-setup");
344 if (is_null_sha1(origin->commit->object.sha1))
345 do_diff_cache(parent->tree->object.sha1, &diff_opts);
346 else
347 diff_tree_sha1(parent->tree->object.sha1,
348 origin->commit->tree->object.sha1,
349 "", &diff_opts);
350 diffcore_std(&diff_opts);
352 /* It is either one entry that says "modified", or "created",
353 * or nothing.
355 if (!diff_queued_diff.nr) {
356 /* The path is the same as parent */
357 porigin = get_origin(sb, parent, origin->path);
358 hashcpy(porigin->blob_sha1, origin->blob_sha1);
360 else if (diff_queued_diff.nr != 1)
361 die("internal error in blame::find_origin");
362 else {
363 struct diff_filepair *p = diff_queued_diff.queue[0];
364 switch (p->status) {
365 default:
366 die("internal error in blame::find_origin (%c)",
367 p->status);
368 case 'M':
369 porigin = get_origin(sb, parent, origin->path);
370 hashcpy(porigin->blob_sha1, p->one->sha1);
371 break;
372 case 'A':
373 case 'T':
374 /* Did not exist in parent, or type changed */
375 break;
378 diff_flush(&diff_opts);
379 if (porigin) {
381 * Create a freestanding copy that is not part of
382 * the refcounted origin found in the scoreboard, and
383 * cache it in the commit.
385 struct origin *cached;
387 cached = make_origin(porigin->commit, porigin->path);
388 hashcpy(cached->blob_sha1, porigin->blob_sha1);
389 parent->util = cached;
391 return porigin;
395 * We have an origin -- find the path that corresponds to it in its
396 * parent and return an origin structure to represent it.
398 static struct origin *find_rename(struct scoreboard *sb,
399 struct commit *parent,
400 struct origin *origin)
402 struct origin *porigin = NULL;
403 struct diff_options diff_opts;
404 int i;
405 const char *paths[2];
407 diff_setup(&diff_opts);
408 diff_opts.recursive = 1;
409 diff_opts.detect_rename = DIFF_DETECT_RENAME;
410 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
411 diff_opts.single_follow = origin->path;
412 paths[0] = NULL;
413 diff_tree_setup_paths(paths, &diff_opts);
414 if (diff_setup_done(&diff_opts) < 0)
415 die("diff-setup");
417 if (is_null_sha1(origin->commit->object.sha1))
418 do_diff_cache(parent->tree->object.sha1, &diff_opts);
419 else
420 diff_tree_sha1(parent->tree->object.sha1,
421 origin->commit->tree->object.sha1,
422 "", &diff_opts);
423 diffcore_std(&diff_opts);
425 for (i = 0; i < diff_queued_diff.nr; i++) {
426 struct diff_filepair *p = diff_queued_diff.queue[i];
427 if ((p->status == 'R' || p->status == 'C') &&
428 !strcmp(p->two->path, origin->path)) {
429 porigin = get_origin(sb, parent, p->one->path);
430 hashcpy(porigin->blob_sha1, p->one->sha1);
431 break;
434 diff_flush(&diff_opts);
435 return porigin;
439 * Parsing of patch chunks...
441 struct chunk {
442 /* line number in postimage; up to but not including this
443 * line is the same as preimage
445 int same;
447 /* preimage line number after this chunk */
448 int p_next;
450 /* postimage line number after this chunk */
451 int t_next;
454 struct patch {
455 struct chunk *chunks;
456 int num;
459 struct blame_diff_state {
460 struct xdiff_emit_state xm;
461 struct patch *ret;
462 unsigned hunk_post_context;
463 unsigned hunk_in_pre_context : 1;
466 static void process_u_diff(void *state_, char *line, unsigned long len)
468 struct blame_diff_state *state = state_;
469 struct chunk *chunk;
470 int off1, off2, len1, len2, num;
472 num = state->ret->num;
473 if (len < 4 || line[0] != '@' || line[1] != '@') {
474 if (state->hunk_in_pre_context && line[0] == ' ')
475 state->ret->chunks[num - 1].same++;
476 else {
477 state->hunk_in_pre_context = 0;
478 if (line[0] == ' ')
479 state->hunk_post_context++;
480 else
481 state->hunk_post_context = 0;
483 return;
486 if (num && state->hunk_post_context) {
487 chunk = &state->ret->chunks[num - 1];
488 chunk->p_next -= state->hunk_post_context;
489 chunk->t_next -= state->hunk_post_context;
491 state->ret->num = ++num;
492 state->ret->chunks = xrealloc(state->ret->chunks,
493 sizeof(struct chunk) * num);
494 chunk = &state->ret->chunks[num - 1];
495 if (parse_hunk_header(line, len, &off1, &len1, &off2, &len2)) {
496 state->ret->num--;
497 return;
500 /* Line numbers in patch output are one based. */
501 off1--;
502 off2--;
504 chunk->same = len2 ? off2 : (off2 + 1);
506 chunk->p_next = off1 + (len1 ? len1 : 1);
507 chunk->t_next = chunk->same + len2;
508 state->hunk_in_pre_context = 1;
509 state->hunk_post_context = 0;
512 static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
513 int context)
515 struct blame_diff_state state;
516 xpparam_t xpp;
517 xdemitconf_t xecfg;
518 xdemitcb_t ecb;
520 xpp.flags = xdl_opts;
521 memset(&xecfg, 0, sizeof(xecfg));
522 xecfg.ctxlen = context;
523 ecb.outf = xdiff_outf;
524 ecb.priv = &state;
525 memset(&state, 0, sizeof(state));
526 state.xm.consume = process_u_diff;
527 state.ret = xmalloc(sizeof(struct patch));
528 state.ret->chunks = NULL;
529 state.ret->num = 0;
531 xdl_diff(file_p, file_o, &xpp, &xecfg, &ecb);
533 if (state.ret->num) {
534 struct chunk *chunk;
535 chunk = &state.ret->chunks[state.ret->num - 1];
536 chunk->p_next -= state.hunk_post_context;
537 chunk->t_next -= state.hunk_post_context;
539 return state.ret;
543 * Run diff between two origins and grab the patch output, so that
544 * we can pass blame for lines origin is currently suspected for
545 * to its parent.
547 static struct patch *get_patch(struct origin *parent, struct origin *origin)
549 mmfile_t file_p, file_o;
550 struct patch *patch;
552 fill_origin_blob(parent, &file_p);
553 fill_origin_blob(origin, &file_o);
554 if (!file_p.ptr || !file_o.ptr)
555 return NULL;
556 patch = compare_buffer(&file_p, &file_o, 0);
557 num_get_patch++;
558 return patch;
561 static void free_patch(struct patch *p)
563 free(p->chunks);
564 free(p);
568 * Link in a new blame entry to the scoreboard. Entries that cover the
569 * same line range have been removed from the scoreboard previously.
571 static void add_blame_entry(struct scoreboard *sb, struct blame_entry *e)
573 struct blame_entry *ent, *prev = NULL;
575 origin_incref(e->suspect);
577 for (ent = sb->ent; ent && ent->lno < e->lno; ent = ent->next)
578 prev = ent;
580 /* prev, if not NULL, is the last one that is below e */
581 e->prev = prev;
582 if (prev) {
583 e->next = prev->next;
584 prev->next = e;
586 else {
587 e->next = sb->ent;
588 sb->ent = e;
590 if (e->next)
591 e->next->prev = e;
595 * src typically is on-stack; we want to copy the information in it to
596 * an malloced blame_entry that is already on the linked list of the
597 * scoreboard. The origin of dst loses a refcnt while the origin of src
598 * gains one.
600 static void dup_entry(struct blame_entry *dst, struct blame_entry *src)
602 struct blame_entry *p, *n;
604 p = dst->prev;
605 n = dst->next;
606 origin_incref(src->suspect);
607 origin_decref(dst->suspect);
608 memcpy(dst, src, sizeof(*src));
609 dst->prev = p;
610 dst->next = n;
611 dst->score = 0;
614 static const char *nth_line(struct scoreboard *sb, int lno)
616 return sb->final_buf + sb->lineno[lno];
620 * It is known that lines between tlno to same came from parent, and e
621 * has an overlap with that range. it also is known that parent's
622 * line plno corresponds to e's line tlno.
624 * <---- e ----->
625 * <------>
626 * <------------>
627 * <------------>
628 * <------------------>
630 * Split e into potentially three parts; before this chunk, the chunk
631 * to be blamed for the parent, and after that portion.
633 static void split_overlap(struct blame_entry *split,
634 struct blame_entry *e,
635 int tlno, int plno, int same,
636 struct origin *parent)
638 int chunk_end_lno;
639 memset(split, 0, sizeof(struct blame_entry [3]));
641 if (e->s_lno < tlno) {
642 /* there is a pre-chunk part not blamed on parent */
643 split[0].suspect = origin_incref(e->suspect);
644 split[0].lno = e->lno;
645 split[0].s_lno = e->s_lno;
646 split[0].num_lines = tlno - e->s_lno;
647 split[1].lno = e->lno + tlno - e->s_lno;
648 split[1].s_lno = plno;
650 else {
651 split[1].lno = e->lno;
652 split[1].s_lno = plno + (e->s_lno - tlno);
655 if (same < e->s_lno + e->num_lines) {
656 /* there is a post-chunk part not blamed on parent */
657 split[2].suspect = origin_incref(e->suspect);
658 split[2].lno = e->lno + (same - e->s_lno);
659 split[2].s_lno = e->s_lno + (same - e->s_lno);
660 split[2].num_lines = e->s_lno + e->num_lines - same;
661 chunk_end_lno = split[2].lno;
663 else
664 chunk_end_lno = e->lno + e->num_lines;
665 split[1].num_lines = chunk_end_lno - split[1].lno;
668 * if it turns out there is nothing to blame the parent for,
669 * forget about the splitting. !split[1].suspect signals this.
671 if (split[1].num_lines < 1)
672 return;
673 split[1].suspect = origin_incref(parent);
677 * split_overlap() divided an existing blame e into up to three parts
678 * in split. Adjust the linked list of blames in the scoreboard to
679 * reflect the split.
681 static void split_blame(struct scoreboard *sb,
682 struct blame_entry *split,
683 struct blame_entry *e)
685 struct blame_entry *new_entry;
687 if (split[0].suspect && split[2].suspect) {
688 /* The first part (reuse storage for the existing entry e) */
689 dup_entry(e, &split[0]);
691 /* The last part -- me */
692 new_entry = xmalloc(sizeof(*new_entry));
693 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
694 add_blame_entry(sb, new_entry);
696 /* ... and the middle part -- parent */
697 new_entry = xmalloc(sizeof(*new_entry));
698 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
699 add_blame_entry(sb, new_entry);
701 else if (!split[0].suspect && !split[2].suspect)
703 * The parent covers the entire area; reuse storage for
704 * e and replace it with the parent.
706 dup_entry(e, &split[1]);
707 else if (split[0].suspect) {
708 /* me and then parent */
709 dup_entry(e, &split[0]);
711 new_entry = xmalloc(sizeof(*new_entry));
712 memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
713 add_blame_entry(sb, new_entry);
715 else {
716 /* parent and then me */
717 dup_entry(e, &split[1]);
719 new_entry = xmalloc(sizeof(*new_entry));
720 memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
721 add_blame_entry(sb, new_entry);
724 if (DEBUG) { /* sanity */
725 struct blame_entry *ent;
726 int lno = sb->ent->lno, corrupt = 0;
728 for (ent = sb->ent; ent; ent = ent->next) {
729 if (lno != ent->lno)
730 corrupt = 1;
731 if (ent->s_lno < 0)
732 corrupt = 1;
733 lno += ent->num_lines;
735 if (corrupt) {
736 lno = sb->ent->lno;
737 for (ent = sb->ent; ent; ent = ent->next) {
738 printf("L %8d l %8d n %8d\n",
739 lno, ent->lno, ent->num_lines);
740 lno = ent->lno + ent->num_lines;
742 die("oops");
748 * After splitting the blame, the origins used by the
749 * on-stack blame_entry should lose one refcnt each.
751 static void decref_split(struct blame_entry *split)
753 int i;
755 for (i = 0; i < 3; i++)
756 origin_decref(split[i].suspect);
760 * Helper for blame_chunk(). blame_entry e is known to overlap with
761 * the patch hunk; split it and pass blame to the parent.
763 static void blame_overlap(struct scoreboard *sb, struct blame_entry *e,
764 int tlno, int plno, int same,
765 struct origin *parent)
767 struct blame_entry split[3];
769 split_overlap(split, e, tlno, plno, same, parent);
770 if (split[1].suspect)
771 split_blame(sb, split, e);
772 decref_split(split);
776 * Find the line number of the last line the target is suspected for.
778 static int find_last_in_target(struct scoreboard *sb, struct origin *target)
780 struct blame_entry *e;
781 int last_in_target = -1;
783 for (e = sb->ent; e; e = e->next) {
784 if (e->guilty || !same_suspect(e->suspect, target))
785 continue;
786 if (last_in_target < e->s_lno + e->num_lines)
787 last_in_target = e->s_lno + e->num_lines;
789 return last_in_target;
793 * Process one hunk from the patch between the current suspect for
794 * blame_entry e and its parent. Find and split the overlap, and
795 * pass blame to the overlapping part to the parent.
797 static void blame_chunk(struct scoreboard *sb,
798 int tlno, int plno, int same,
799 struct origin *target, struct origin *parent)
801 struct blame_entry *e;
803 for (e = sb->ent; e; e = e->next) {
804 if (e->guilty || !same_suspect(e->suspect, target))
805 continue;
806 if (same <= e->s_lno)
807 continue;
808 if (tlno < e->s_lno + e->num_lines)
809 blame_overlap(sb, e, tlno, plno, same, parent);
814 * We are looking at the origin 'target' and aiming to pass blame
815 * for the lines it is suspected to its parent. Run diff to find
816 * which lines came from parent and pass blame for them.
818 static int pass_blame_to_parent(struct scoreboard *sb,
819 struct origin *target,
820 struct origin *parent)
822 int i, last_in_target, plno, tlno;
823 struct patch *patch;
825 last_in_target = find_last_in_target(sb, target);
826 if (last_in_target < 0)
827 return 1; /* nothing remains for this target */
829 patch = get_patch(parent, target);
830 plno = tlno = 0;
831 for (i = 0; i < patch->num; i++) {
832 struct chunk *chunk = &patch->chunks[i];
834 blame_chunk(sb, tlno, plno, chunk->same, target, parent);
835 plno = chunk->p_next;
836 tlno = chunk->t_next;
838 /* The rest (i.e. anything after tlno) are the same as the parent */
839 blame_chunk(sb, tlno, plno, last_in_target, target, parent);
841 free_patch(patch);
842 return 0;
846 * The lines in blame_entry after splitting blames many times can become
847 * very small and trivial, and at some point it becomes pointless to
848 * blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
849 * ordinary C program, and it is not worth to say it was copied from
850 * totally unrelated file in the parent.
852 * Compute how trivial the lines in the blame_entry are.
854 static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
856 unsigned score;
857 const char *cp, *ep;
859 if (e->score)
860 return e->score;
862 score = 1;
863 cp = nth_line(sb, e->lno);
864 ep = nth_line(sb, e->lno + e->num_lines);
865 while (cp < ep) {
866 unsigned ch = *((unsigned char *)cp);
867 if (isalnum(ch))
868 score++;
869 cp++;
871 e->score = score;
872 return score;
876 * best_so_far[] and this[] are both a split of an existing blame_entry
877 * that passes blame to the parent. Maintain best_so_far the best split
878 * so far, by comparing this and best_so_far and copying this into
879 * bst_so_far as needed.
881 static void copy_split_if_better(struct scoreboard *sb,
882 struct blame_entry *best_so_far,
883 struct blame_entry *this)
885 int i;
887 if (!this[1].suspect)
888 return;
889 if (best_so_far[1].suspect) {
890 if (ent_score(sb, &this[1]) < ent_score(sb, &best_so_far[1]))
891 return;
894 for (i = 0; i < 3; i++)
895 origin_incref(this[i].suspect);
896 decref_split(best_so_far);
897 memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
901 * We are looking at a part of the final image represented by
902 * ent (tlno and same are offset by ent->s_lno).
903 * tlno is where we are looking at in the final image.
904 * up to (but not including) same match preimage.
905 * plno is where we are looking at in the preimage.
907 * <-------------- final image ---------------------->
908 * <------ent------>
909 * ^tlno ^same
910 * <---------preimage----->
911 * ^plno
913 * All line numbers are 0-based.
915 static void handle_split(struct scoreboard *sb,
916 struct blame_entry *ent,
917 int tlno, int plno, int same,
918 struct origin *parent,
919 struct blame_entry *split)
921 if (ent->num_lines <= tlno)
922 return;
923 if (tlno < same) {
924 struct blame_entry this[3];
925 tlno += ent->s_lno;
926 same += ent->s_lno;
927 split_overlap(this, ent, tlno, plno, same, parent);
928 copy_split_if_better(sb, split, this);
929 decref_split(this);
934 * Find the lines from parent that are the same as ent so that
935 * we can pass blames to it. file_p has the blob contents for
936 * the parent.
938 static void find_copy_in_blob(struct scoreboard *sb,
939 struct blame_entry *ent,
940 struct origin *parent,
941 struct blame_entry *split,
942 mmfile_t *file_p)
944 const char *cp;
945 int cnt;
946 mmfile_t file_o;
947 struct patch *patch;
948 int i, plno, tlno;
951 * Prepare mmfile that contains only the lines in ent.
953 cp = nth_line(sb, ent->lno);
954 file_o.ptr = (char*) cp;
955 cnt = ent->num_lines;
957 while (cnt && cp < sb->final_buf + sb->final_buf_size) {
958 if (*cp++ == '\n')
959 cnt--;
961 file_o.size = cp - file_o.ptr;
963 patch = compare_buffer(file_p, &file_o, 1);
966 * file_o is a part of final image we are annotating.
967 * file_p partially may match that image.
969 memset(split, 0, sizeof(struct blame_entry [3]));
970 plno = tlno = 0;
971 for (i = 0; i < patch->num; i++) {
972 struct chunk *chunk = &patch->chunks[i];
974 handle_split(sb, ent, tlno, plno, chunk->same, parent, split);
975 plno = chunk->p_next;
976 tlno = chunk->t_next;
978 /* remainder, if any, all match the preimage */
979 handle_split(sb, ent, tlno, plno, ent->num_lines, parent, split);
980 free_patch(patch);
984 * See if lines currently target is suspected for can be attributed to
985 * parent.
987 static int find_move_in_parent(struct scoreboard *sb,
988 struct origin *target,
989 struct origin *parent)
991 int last_in_target, made_progress;
992 struct blame_entry *e, split[3];
993 mmfile_t file_p;
995 last_in_target = find_last_in_target(sb, target);
996 if (last_in_target < 0)
997 return 1; /* nothing remains for this target */
999 fill_origin_blob(parent, &file_p);
1000 if (!file_p.ptr)
1001 return 0;
1003 made_progress = 1;
1004 while (made_progress) {
1005 made_progress = 0;
1006 for (e = sb->ent; e; e = e->next) {
1007 if (e->guilty || !same_suspect(e->suspect, target))
1008 continue;
1009 find_copy_in_blob(sb, e, parent, split, &file_p);
1010 if (split[1].suspect &&
1011 blame_move_score < ent_score(sb, &split[1])) {
1012 split_blame(sb, split, e);
1013 made_progress = 1;
1015 decref_split(split);
1018 return 0;
1021 struct blame_list {
1022 struct blame_entry *ent;
1023 struct blame_entry split[3];
1027 * Count the number of entries the target is suspected for,
1028 * and prepare a list of entry and the best split.
1030 static struct blame_list *setup_blame_list(struct scoreboard *sb,
1031 struct origin *target,
1032 int *num_ents_p)
1034 struct blame_entry *e;
1035 int num_ents, i;
1036 struct blame_list *blame_list = NULL;
1038 for (e = sb->ent, num_ents = 0; e; e = e->next)
1039 if (!e->guilty && same_suspect(e->suspect, target))
1040 num_ents++;
1041 if (num_ents) {
1042 blame_list = xcalloc(num_ents, sizeof(struct blame_list));
1043 for (e = sb->ent, i = 0; e; e = e->next)
1044 if (!e->guilty && same_suspect(e->suspect, target))
1045 blame_list[i++].ent = e;
1047 *num_ents_p = num_ents;
1048 return blame_list;
1052 * For lines target is suspected for, see if we can find code movement
1053 * across file boundary from the parent commit. porigin is the path
1054 * in the parent we already tried.
1056 static int find_copy_in_parent(struct scoreboard *sb,
1057 struct origin *target,
1058 struct commit *parent,
1059 struct origin *porigin,
1060 int opt)
1062 struct diff_options diff_opts;
1063 const char *paths[1];
1064 int i, j;
1065 int retval;
1066 struct blame_list *blame_list;
1067 int num_ents;
1069 blame_list = setup_blame_list(sb, target, &num_ents);
1070 if (!blame_list)
1071 return 1; /* nothing remains for this target */
1073 diff_setup(&diff_opts);
1074 diff_opts.recursive = 1;
1075 diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
1077 paths[0] = NULL;
1078 diff_tree_setup_paths(paths, &diff_opts);
1079 if (diff_setup_done(&diff_opts) < 0)
1080 die("diff-setup");
1082 /* Try "find copies harder" on new path if requested;
1083 * we do not want to use diffcore_rename() actually to
1084 * match things up; find_copies_harder is set only to
1085 * force diff_tree_sha1() to feed all filepairs to diff_queue,
1086 * and this code needs to be after diff_setup_done(), which
1087 * usually makes find-copies-harder imply copy detection.
1089 if ((opt & PICKAXE_BLAME_COPY_HARDEST)
1090 || ((opt & PICKAXE_BLAME_COPY_HARDER)
1091 && (!porigin || strcmp(target->path, porigin->path))))
1092 diff_opts.find_copies_harder = 1;
1094 if (is_null_sha1(target->commit->object.sha1))
1095 do_diff_cache(parent->tree->object.sha1, &diff_opts);
1096 else
1097 diff_tree_sha1(parent->tree->object.sha1,
1098 target->commit->tree->object.sha1,
1099 "", &diff_opts);
1101 if (!diff_opts.find_copies_harder)
1102 diffcore_std(&diff_opts);
1104 retval = 0;
1105 while (1) {
1106 int made_progress = 0;
1108 for (i = 0; i < diff_queued_diff.nr; i++) {
1109 struct diff_filepair *p = diff_queued_diff.queue[i];
1110 struct origin *norigin;
1111 mmfile_t file_p;
1112 struct blame_entry this[3];
1114 if (!DIFF_FILE_VALID(p->one))
1115 continue; /* does not exist in parent */
1116 if (porigin && !strcmp(p->one->path, porigin->path))
1117 /* find_move already dealt with this path */
1118 continue;
1120 norigin = get_origin(sb, parent, p->one->path);
1121 hashcpy(norigin->blob_sha1, p->one->sha1);
1122 fill_origin_blob(norigin, &file_p);
1123 if (!file_p.ptr)
1124 continue;
1126 for (j = 0; j < num_ents; j++) {
1127 find_copy_in_blob(sb, blame_list[j].ent,
1128 norigin, this, &file_p);
1129 copy_split_if_better(sb, blame_list[j].split,
1130 this);
1131 decref_split(this);
1133 origin_decref(norigin);
1136 for (j = 0; j < num_ents; j++) {
1137 struct blame_entry *split = blame_list[j].split;
1138 if (split[1].suspect &&
1139 blame_copy_score < ent_score(sb, &split[1])) {
1140 split_blame(sb, split, blame_list[j].ent);
1141 made_progress = 1;
1143 decref_split(split);
1145 free(blame_list);
1147 if (!made_progress)
1148 break;
1149 blame_list = setup_blame_list(sb, target, &num_ents);
1150 if (!blame_list) {
1151 retval = 1;
1152 break;
1155 diff_flush(&diff_opts);
1157 return retval;
1161 * The blobs of origin and porigin exactly match, so everything
1162 * origin is suspected for can be blamed on the parent.
1164 static void pass_whole_blame(struct scoreboard *sb,
1165 struct origin *origin, struct origin *porigin)
1167 struct blame_entry *e;
1169 if (!porigin->file.ptr && origin->file.ptr) {
1170 /* Steal its file */
1171 porigin->file = origin->file;
1172 origin->file.ptr = NULL;
1174 for (e = sb->ent; e; e = e->next) {
1175 if (!same_suspect(e->suspect, origin))
1176 continue;
1177 origin_incref(porigin);
1178 origin_decref(e->suspect);
1179 e->suspect = porigin;
1183 #define MAXPARENT 16
1185 static void pass_blame(struct scoreboard *sb, struct origin *origin, int opt)
1187 int i, pass;
1188 struct commit *commit = origin->commit;
1189 struct commit_list *parent;
1190 struct origin *parent_origin[MAXPARENT], *porigin;
1192 memset(parent_origin, 0, sizeof(parent_origin));
1194 /* The first pass looks for unrenamed path to optimize for
1195 * common cases, then we look for renames in the second pass.
1197 for (pass = 0; pass < 2; pass++) {
1198 struct origin *(*find)(struct scoreboard *,
1199 struct commit *, struct origin *);
1200 find = pass ? find_rename : find_origin;
1202 for (i = 0, parent = commit->parents;
1203 i < MAXPARENT && parent;
1204 parent = parent->next, i++) {
1205 struct commit *p = parent->item;
1206 int j, same;
1208 if (parent_origin[i])
1209 continue;
1210 if (parse_commit(p))
1211 continue;
1212 porigin = find(sb, p, origin);
1213 if (!porigin)
1214 continue;
1215 if (!hashcmp(porigin->blob_sha1, origin->blob_sha1)) {
1216 pass_whole_blame(sb, origin, porigin);
1217 origin_decref(porigin);
1218 goto finish;
1220 for (j = same = 0; j < i; j++)
1221 if (parent_origin[j] &&
1222 !hashcmp(parent_origin[j]->blob_sha1,
1223 porigin->blob_sha1)) {
1224 same = 1;
1225 break;
1227 if (!same)
1228 parent_origin[i] = porigin;
1229 else
1230 origin_decref(porigin);
1234 num_commits++;
1235 for (i = 0, parent = commit->parents;
1236 i < MAXPARENT && parent;
1237 parent = parent->next, i++) {
1238 struct origin *porigin = parent_origin[i];
1239 if (!porigin)
1240 continue;
1241 if (pass_blame_to_parent(sb, origin, porigin))
1242 goto finish;
1246 * Optionally find moves in parents' files.
1248 if (opt & PICKAXE_BLAME_MOVE)
1249 for (i = 0, parent = commit->parents;
1250 i < MAXPARENT && parent;
1251 parent = parent->next, i++) {
1252 struct origin *porigin = parent_origin[i];
1253 if (!porigin)
1254 continue;
1255 if (find_move_in_parent(sb, origin, porigin))
1256 goto finish;
1260 * Optionally find copies from parents' files.
1262 if (opt & PICKAXE_BLAME_COPY)
1263 for (i = 0, parent = commit->parents;
1264 i < MAXPARENT && parent;
1265 parent = parent->next, i++) {
1266 struct origin *porigin = parent_origin[i];
1267 if (find_copy_in_parent(sb, origin, parent->item,
1268 porigin, opt))
1269 goto finish;
1272 finish:
1273 for (i = 0; i < MAXPARENT; i++)
1274 origin_decref(parent_origin[i]);
1278 * Information on commits, used for output.
1280 struct commit_info
1282 const char *author;
1283 const char *author_mail;
1284 unsigned long author_time;
1285 const char *author_tz;
1287 /* filled only when asked for details */
1288 const char *committer;
1289 const char *committer_mail;
1290 unsigned long committer_time;
1291 const char *committer_tz;
1293 const char *summary;
1297 * Parse author/committer line in the commit object buffer
1299 static void get_ac_line(const char *inbuf, const char *what,
1300 int bufsz, char *person, const char **mail,
1301 unsigned long *time, const char **tz)
1303 int len, tzlen, maillen;
1304 char *tmp, *endp, *timepos;
1306 tmp = strstr(inbuf, what);
1307 if (!tmp)
1308 goto error_out;
1309 tmp += strlen(what);
1310 endp = strchr(tmp, '\n');
1311 if (!endp)
1312 len = strlen(tmp);
1313 else
1314 len = endp - tmp;
1315 if (bufsz <= len) {
1316 error_out:
1317 /* Ugh */
1318 *mail = *tz = "(unknown)";
1319 *time = 0;
1320 return;
1322 memcpy(person, tmp, len);
1324 tmp = person;
1325 tmp += len;
1326 *tmp = 0;
1327 while (*tmp != ' ')
1328 tmp--;
1329 *tz = tmp+1;
1330 tzlen = (person+len)-(tmp+1);
1332 *tmp = 0;
1333 while (*tmp != ' ')
1334 tmp--;
1335 *time = strtoul(tmp, NULL, 10);
1336 timepos = tmp;
1338 *tmp = 0;
1339 while (*tmp != ' ')
1340 tmp--;
1341 *mail = tmp + 1;
1342 *tmp = 0;
1343 maillen = timepos - tmp;
1345 if (!mailmap.nr)
1346 return;
1349 * mailmap expansion may make the name longer.
1350 * make room by pushing stuff down.
1352 tmp = person + bufsz - (tzlen + 1);
1353 memmove(tmp, *tz, tzlen);
1354 tmp[tzlen] = 0;
1355 *tz = tmp;
1357 tmp = tmp - (maillen + 1);
1358 memmove(tmp, *mail, maillen);
1359 tmp[maillen] = 0;
1360 *mail = tmp;
1363 * Now, convert e-mail using mailmap
1365 map_email(&mailmap, tmp + 1, person, tmp-person-1);
1368 static void get_commit_info(struct commit *commit,
1369 struct commit_info *ret,
1370 int detailed)
1372 int len;
1373 char *tmp, *endp;
1374 static char author_buf[1024];
1375 static char committer_buf[1024];
1376 static char summary_buf[1024];
1379 * We've operated without save_commit_buffer, so
1380 * we now need to populate them for output.
1382 if (!commit->buffer) {
1383 enum object_type type;
1384 unsigned long size;
1385 commit->buffer =
1386 read_sha1_file(commit->object.sha1, &type, &size);
1388 ret->author = author_buf;
1389 get_ac_line(commit->buffer, "\nauthor ",
1390 sizeof(author_buf), author_buf, &ret->author_mail,
1391 &ret->author_time, &ret->author_tz);
1393 if (!detailed)
1394 return;
1396 ret->committer = committer_buf;
1397 get_ac_line(commit->buffer, "\ncommitter ",
1398 sizeof(committer_buf), committer_buf, &ret->committer_mail,
1399 &ret->committer_time, &ret->committer_tz);
1401 ret->summary = summary_buf;
1402 tmp = strstr(commit->buffer, "\n\n");
1403 if (!tmp) {
1404 error_out:
1405 sprintf(summary_buf, "(%s)", sha1_to_hex(commit->object.sha1));
1406 return;
1408 tmp += 2;
1409 endp = strchr(tmp, '\n');
1410 if (!endp)
1411 endp = tmp + strlen(tmp);
1412 len = endp - tmp;
1413 if (len >= sizeof(summary_buf) || len == 0)
1414 goto error_out;
1415 memcpy(summary_buf, tmp, len);
1416 summary_buf[len] = 0;
1420 * To allow LF and other nonportable characters in pathnames,
1421 * they are c-style quoted as needed.
1423 static void write_filename_info(const char *path)
1425 printf("filename ");
1426 write_name_quoted(NULL, 0, path, 1, stdout);
1427 putchar('\n');
1431 * The blame_entry is found to be guilty for the range. Mark it
1432 * as such, and show it in incremental output.
1434 static void found_guilty_entry(struct blame_entry *ent)
1436 if (ent->guilty)
1437 return;
1438 ent->guilty = 1;
1439 if (incremental) {
1440 struct origin *suspect = ent->suspect;
1442 printf("%s %d %d %d\n",
1443 sha1_to_hex(suspect->commit->object.sha1),
1444 ent->s_lno + 1, ent->lno + 1, ent->num_lines);
1445 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1446 struct commit_info ci;
1447 suspect->commit->object.flags |= METAINFO_SHOWN;
1448 get_commit_info(suspect->commit, &ci, 1);
1449 printf("author %s\n", ci.author);
1450 printf("author-mail %s\n", ci.author_mail);
1451 printf("author-time %lu\n", ci.author_time);
1452 printf("author-tz %s\n", ci.author_tz);
1453 printf("committer %s\n", ci.committer);
1454 printf("committer-mail %s\n", ci.committer_mail);
1455 printf("committer-time %lu\n", ci.committer_time);
1456 printf("committer-tz %s\n", ci.committer_tz);
1457 printf("summary %s\n", ci.summary);
1458 if (suspect->commit->object.flags & UNINTERESTING)
1459 printf("boundary\n");
1461 write_filename_info(suspect->path);
1462 maybe_flush_or_die(stdout, "stdout");
1467 * The main loop -- while the scoreboard has lines whose true origin
1468 * is still unknown, pick one blame_entry, and allow its current
1469 * suspect to pass blames to its parents.
1471 static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
1473 while (1) {
1474 struct blame_entry *ent;
1475 struct commit *commit;
1476 struct origin *suspect = NULL;
1478 /* find one suspect to break down */
1479 for (ent = sb->ent; !suspect && ent; ent = ent->next)
1480 if (!ent->guilty)
1481 suspect = ent->suspect;
1482 if (!suspect)
1483 return; /* all done */
1486 * We will use this suspect later in the loop,
1487 * so hold onto it in the meantime.
1489 origin_incref(suspect);
1490 commit = suspect->commit;
1491 if (!commit->object.parsed)
1492 parse_commit(commit);
1493 if (!(commit->object.flags & UNINTERESTING) &&
1494 !(revs->max_age != -1 && commit->date < revs->max_age))
1495 pass_blame(sb, suspect, opt);
1496 else {
1497 commit->object.flags |= UNINTERESTING;
1498 if (commit->object.parsed)
1499 mark_parents_uninteresting(commit);
1501 /* treat root commit as boundary */
1502 if (!commit->parents && !show_root)
1503 commit->object.flags |= UNINTERESTING;
1505 /* Take responsibility for the remaining entries */
1506 for (ent = sb->ent; ent; ent = ent->next)
1507 if (same_suspect(ent->suspect, suspect))
1508 found_guilty_entry(ent);
1509 origin_decref(suspect);
1511 if (DEBUG) /* sanity */
1512 sanity_check_refcnt(sb);
1516 static const char *format_time(unsigned long time, const char *tz_str,
1517 int show_raw_time)
1519 static char time_buf[128];
1520 time_t t = time;
1521 int minutes, tz;
1522 struct tm *tm;
1524 if (show_raw_time) {
1525 sprintf(time_buf, "%lu %s", time, tz_str);
1526 return time_buf;
1529 tz = atoi(tz_str);
1530 minutes = tz < 0 ? -tz : tz;
1531 minutes = (minutes / 100)*60 + (minutes % 100);
1532 minutes = tz < 0 ? -minutes : minutes;
1533 t = time + minutes * 60;
1534 tm = gmtime(&t);
1536 strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
1537 strcat(time_buf, tz_str);
1538 return time_buf;
1541 #define OUTPUT_ANNOTATE_COMPAT 001
1542 #define OUTPUT_LONG_OBJECT_NAME 002
1543 #define OUTPUT_RAW_TIMESTAMP 004
1544 #define OUTPUT_PORCELAIN 010
1545 #define OUTPUT_SHOW_NAME 020
1546 #define OUTPUT_SHOW_NUMBER 040
1547 #define OUTPUT_SHOW_SCORE 0100
1548 #define OUTPUT_NO_AUTHOR 0200
1550 static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent)
1552 int cnt;
1553 const char *cp;
1554 struct origin *suspect = ent->suspect;
1555 char hex[41];
1557 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1558 printf("%s%c%d %d %d\n",
1559 hex,
1560 ent->guilty ? ' ' : '*', // purely for debugging
1561 ent->s_lno + 1,
1562 ent->lno + 1,
1563 ent->num_lines);
1564 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1565 struct commit_info ci;
1566 suspect->commit->object.flags |= METAINFO_SHOWN;
1567 get_commit_info(suspect->commit, &ci, 1);
1568 printf("author %s\n", ci.author);
1569 printf("author-mail %s\n", ci.author_mail);
1570 printf("author-time %lu\n", ci.author_time);
1571 printf("author-tz %s\n", ci.author_tz);
1572 printf("committer %s\n", ci.committer);
1573 printf("committer-mail %s\n", ci.committer_mail);
1574 printf("committer-time %lu\n", ci.committer_time);
1575 printf("committer-tz %s\n", ci.committer_tz);
1576 write_filename_info(suspect->path);
1577 printf("summary %s\n", ci.summary);
1578 if (suspect->commit->object.flags & UNINTERESTING)
1579 printf("boundary\n");
1581 else if (suspect->commit->object.flags & MORE_THAN_ONE_PATH)
1582 write_filename_info(suspect->path);
1584 cp = nth_line(sb, ent->lno);
1585 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1586 char ch;
1587 if (cnt)
1588 printf("%s %d %d\n", hex,
1589 ent->s_lno + 1 + cnt,
1590 ent->lno + 1 + cnt);
1591 putchar('\t');
1592 do {
1593 ch = *cp++;
1594 putchar(ch);
1595 } while (ch != '\n' &&
1596 cp < sb->final_buf + sb->final_buf_size);
1600 static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
1602 int cnt;
1603 const char *cp;
1604 struct origin *suspect = ent->suspect;
1605 struct commit_info ci;
1606 char hex[41];
1607 int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
1609 get_commit_info(suspect->commit, &ci, 1);
1610 strcpy(hex, sha1_to_hex(suspect->commit->object.sha1));
1612 cp = nth_line(sb, ent->lno);
1613 for (cnt = 0; cnt < ent->num_lines; cnt++) {
1614 char ch;
1615 int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : 8;
1617 if (suspect->commit->object.flags & UNINTERESTING) {
1618 if (blank_boundary)
1619 memset(hex, ' ', length);
1620 else if (!cmd_is_annotate) {
1621 length--;
1622 putchar('^');
1626 printf("%.*s", length, hex);
1627 if (opt & OUTPUT_ANNOTATE_COMPAT)
1628 printf("\t(%10s\t%10s\t%d)", ci.author,
1629 format_time(ci.author_time, ci.author_tz,
1630 show_raw_time),
1631 ent->lno + 1 + cnt);
1632 else {
1633 if (opt & OUTPUT_SHOW_SCORE)
1634 printf(" %*d %02d",
1635 max_score_digits, ent->score,
1636 ent->suspect->refcnt);
1637 if (opt & OUTPUT_SHOW_NAME)
1638 printf(" %-*.*s", longest_file, longest_file,
1639 suspect->path);
1640 if (opt & OUTPUT_SHOW_NUMBER)
1641 printf(" %*d", max_orig_digits,
1642 ent->s_lno + 1 + cnt);
1644 if (!(opt & OUTPUT_NO_AUTHOR))
1645 printf(" (%-*.*s %10s",
1646 longest_author, longest_author,
1647 ci.author,
1648 format_time(ci.author_time,
1649 ci.author_tz,
1650 show_raw_time));
1651 printf(" %*d) ",
1652 max_digits, ent->lno + 1 + cnt);
1654 do {
1655 ch = *cp++;
1656 putchar(ch);
1657 } while (ch != '\n' &&
1658 cp < sb->final_buf + sb->final_buf_size);
1662 static void output(struct scoreboard *sb, int option)
1664 struct blame_entry *ent;
1666 if (option & OUTPUT_PORCELAIN) {
1667 for (ent = sb->ent; ent; ent = ent->next) {
1668 struct blame_entry *oth;
1669 struct origin *suspect = ent->suspect;
1670 struct commit *commit = suspect->commit;
1671 if (commit->object.flags & MORE_THAN_ONE_PATH)
1672 continue;
1673 for (oth = ent->next; oth; oth = oth->next) {
1674 if ((oth->suspect->commit != commit) ||
1675 !strcmp(oth->suspect->path, suspect->path))
1676 continue;
1677 commit->object.flags |= MORE_THAN_ONE_PATH;
1678 break;
1683 for (ent = sb->ent; ent; ent = ent->next) {
1684 if (option & OUTPUT_PORCELAIN)
1685 emit_porcelain(sb, ent);
1686 else {
1687 emit_other(sb, ent, option);
1693 * To allow quick access to the contents of nth line in the
1694 * final image, prepare an index in the scoreboard.
1696 static int prepare_lines(struct scoreboard *sb)
1698 const char *buf = sb->final_buf;
1699 unsigned long len = sb->final_buf_size;
1700 int num = 0, incomplete = 0, bol = 1;
1702 if (len && buf[len-1] != '\n')
1703 incomplete++; /* incomplete line at the end */
1704 while (len--) {
1705 if (bol) {
1706 sb->lineno = xrealloc(sb->lineno,
1707 sizeof(int* ) * (num + 1));
1708 sb->lineno[num] = buf - sb->final_buf;
1709 bol = 0;
1711 if (*buf++ == '\n') {
1712 num++;
1713 bol = 1;
1716 sb->lineno = xrealloc(sb->lineno,
1717 sizeof(int* ) * (num + incomplete + 1));
1718 sb->lineno[num + incomplete] = buf - sb->final_buf;
1719 sb->num_lines = num + incomplete;
1720 return sb->num_lines;
1724 * Add phony grafts for use with -S; this is primarily to
1725 * support git-cvsserver that wants to give a linear history
1726 * to its clients.
1728 static int read_ancestry(const char *graft_file)
1730 FILE *fp = fopen(graft_file, "r");
1731 char buf[1024];
1732 if (!fp)
1733 return -1;
1734 while (fgets(buf, sizeof(buf), fp)) {
1735 /* The format is just "Commit Parent1 Parent2 ...\n" */
1736 int len = strlen(buf);
1737 struct commit_graft *graft = read_graft_line(buf, len);
1738 if (graft)
1739 register_commit_graft(graft, 0);
1741 fclose(fp);
1742 return 0;
1746 * How many columns do we need to show line numbers in decimal?
1748 static int lineno_width(int lines)
1750 int i, width;
1752 for (width = 1, i = 10; i <= lines + 1; width++)
1753 i *= 10;
1754 return width;
1758 * How many columns do we need to show line numbers, authors,
1759 * and filenames?
1761 static void find_alignment(struct scoreboard *sb, int *option)
1763 int longest_src_lines = 0;
1764 int longest_dst_lines = 0;
1765 unsigned largest_score = 0;
1766 struct blame_entry *e;
1768 for (e = sb->ent; e; e = e->next) {
1769 struct origin *suspect = e->suspect;
1770 struct commit_info ci;
1771 int num;
1773 if (strcmp(suspect->path, sb->path))
1774 *option |= OUTPUT_SHOW_NAME;
1775 num = strlen(suspect->path);
1776 if (longest_file < num)
1777 longest_file = num;
1778 if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
1779 suspect->commit->object.flags |= METAINFO_SHOWN;
1780 get_commit_info(suspect->commit, &ci, 1);
1781 num = strlen(ci.author);
1782 if (longest_author < num)
1783 longest_author = num;
1785 num = e->s_lno + e->num_lines;
1786 if (longest_src_lines < num)
1787 longest_src_lines = num;
1788 num = e->lno + e->num_lines;
1789 if (longest_dst_lines < num)
1790 longest_dst_lines = num;
1791 if (largest_score < ent_score(sb, e))
1792 largest_score = ent_score(sb, e);
1794 max_orig_digits = lineno_width(longest_src_lines);
1795 max_digits = lineno_width(longest_dst_lines);
1796 max_score_digits = lineno_width(largest_score);
1800 * For debugging -- origin is refcounted, and this asserts that
1801 * we do not underflow.
1803 static void sanity_check_refcnt(struct scoreboard *sb)
1805 int baa = 0;
1806 struct blame_entry *ent;
1808 for (ent = sb->ent; ent; ent = ent->next) {
1809 /* Nobody should have zero or negative refcnt */
1810 if (ent->suspect->refcnt <= 0) {
1811 fprintf(stderr, "%s in %s has negative refcnt %d\n",
1812 ent->suspect->path,
1813 sha1_to_hex(ent->suspect->commit->object.sha1),
1814 ent->suspect->refcnt);
1815 baa = 1;
1818 for (ent = sb->ent; ent; ent = ent->next) {
1819 /* Mark the ones that haven't been checked */
1820 if (0 < ent->suspect->refcnt)
1821 ent->suspect->refcnt = -ent->suspect->refcnt;
1823 for (ent = sb->ent; ent; ent = ent->next) {
1825 * ... then pick each and see if they have the the
1826 * correct refcnt.
1828 int found;
1829 struct blame_entry *e;
1830 struct origin *suspect = ent->suspect;
1832 if (0 < suspect->refcnt)
1833 continue;
1834 suspect->refcnt = -suspect->refcnt; /* Unmark */
1835 for (found = 0, e = sb->ent; e; e = e->next) {
1836 if (e->suspect != suspect)
1837 continue;
1838 found++;
1840 if (suspect->refcnt != found) {
1841 fprintf(stderr, "%s in %s has refcnt %d, not %d\n",
1842 ent->suspect->path,
1843 sha1_to_hex(ent->suspect->commit->object.sha1),
1844 ent->suspect->refcnt, found);
1845 baa = 2;
1848 if (baa) {
1849 int opt = 0160;
1850 find_alignment(sb, &opt);
1851 output(sb, opt);
1852 die("Baa %d!", baa);
1857 * Used for the command line parsing; check if the path exists
1858 * in the working tree.
1860 static int has_path_in_work_tree(const char *path)
1862 struct stat st;
1863 return !lstat(path, &st);
1866 static unsigned parse_score(const char *arg)
1868 char *end;
1869 unsigned long score = strtoul(arg, &end, 10);
1870 if (*end)
1871 return 0;
1872 return score;
1875 static const char *add_prefix(const char *prefix, const char *path)
1877 if (!prefix || !prefix[0])
1878 return path;
1879 return prefix_path(prefix, strlen(prefix), path);
1883 * Parsing of (comma separated) one item in the -L option
1885 static const char *parse_loc(const char *spec,
1886 struct scoreboard *sb, long lno,
1887 long begin, long *ret)
1889 char *term;
1890 const char *line;
1891 long num;
1892 int reg_error;
1893 regex_t regexp;
1894 regmatch_t match[1];
1896 /* Allow "-L <something>,+20" to mean starting at <something>
1897 * for 20 lines, or "-L <something>,-5" for 5 lines ending at
1898 * <something>.
1900 if (1 < begin && (spec[0] == '+' || spec[0] == '-')) {
1901 num = strtol(spec + 1, &term, 10);
1902 if (term != spec + 1) {
1903 if (spec[0] == '-')
1904 num = 0 - num;
1905 if (0 < num)
1906 *ret = begin + num - 2;
1907 else if (!num)
1908 *ret = begin;
1909 else
1910 *ret = begin + num;
1911 return term;
1913 return spec;
1915 num = strtol(spec, &term, 10);
1916 if (term != spec) {
1917 *ret = num;
1918 return term;
1920 if (spec[0] != '/')
1921 return spec;
1923 /* it could be a regexp of form /.../ */
1924 for (term = (char*) spec + 1; *term && *term != '/'; term++) {
1925 if (*term == '\\')
1926 term++;
1928 if (*term != '/')
1929 return spec;
1931 /* try [spec+1 .. term-1] as regexp */
1932 *term = 0;
1933 begin--; /* input is in human terms */
1934 line = nth_line(sb, begin);
1936 if (!(reg_error = regcomp(&regexp, spec + 1, REG_NEWLINE)) &&
1937 !(reg_error = regexec(&regexp, line, 1, match, 0))) {
1938 const char *cp = line + match[0].rm_so;
1939 const char *nline;
1941 while (begin++ < lno) {
1942 nline = nth_line(sb, begin);
1943 if (line <= cp && cp < nline)
1944 break;
1945 line = nline;
1947 *ret = begin;
1948 regfree(&regexp);
1949 *term++ = '/';
1950 return term;
1952 else {
1953 char errbuf[1024];
1954 regerror(reg_error, &regexp, errbuf, 1024);
1955 die("-L parameter '%s': %s", spec + 1, errbuf);
1960 * Parsing of -L option
1962 static void prepare_blame_range(struct scoreboard *sb,
1963 const char *bottomtop,
1964 long lno,
1965 long *bottom, long *top)
1967 const char *term;
1969 term = parse_loc(bottomtop, sb, lno, 1, bottom);
1970 if (*term == ',') {
1971 term = parse_loc(term + 1, sb, lno, *bottom + 1, top);
1972 if (*term)
1973 usage(blame_usage);
1975 if (*term)
1976 usage(blame_usage);
1979 static int git_blame_config(const char *var, const char *value)
1981 if (!strcmp(var, "blame.showroot")) {
1982 show_root = git_config_bool(var, value);
1983 return 0;
1985 if (!strcmp(var, "blame.blankboundary")) {
1986 blank_boundary = git_config_bool(var, value);
1987 return 0;
1989 return git_default_config(var, value);
1992 static struct commit *fake_working_tree_commit(const char *path, const char *contents_from)
1994 struct commit *commit;
1995 struct origin *origin;
1996 unsigned char head_sha1[20];
1997 char *buf;
1998 const char *ident;
1999 int fd;
2000 time_t now;
2001 unsigned long fin_size;
2002 int size, len;
2003 struct cache_entry *ce;
2004 unsigned mode;
2006 if (get_sha1("HEAD", head_sha1))
2007 die("No such ref: HEAD");
2009 time(&now);
2010 commit = xcalloc(1, sizeof(*commit));
2011 commit->parents = xcalloc(1, sizeof(*commit->parents));
2012 commit->parents->item = lookup_commit_reference(head_sha1);
2013 commit->object.parsed = 1;
2014 commit->date = now;
2015 commit->object.type = OBJ_COMMIT;
2017 origin = make_origin(commit, path);
2019 if (!contents_from || strcmp("-", contents_from)) {
2020 struct stat st;
2021 const char *read_from;
2023 if (contents_from) {
2024 if (stat(contents_from, &st) < 0)
2025 die("Cannot stat %s", contents_from);
2026 read_from = contents_from;
2028 else {
2029 if (lstat(path, &st) < 0)
2030 die("Cannot lstat %s", path);
2031 read_from = path;
2033 fin_size = xsize_t(st.st_size);
2034 buf = xmalloc(fin_size+1);
2035 mode = canon_mode(st.st_mode);
2036 switch (st.st_mode & S_IFMT) {
2037 case S_IFREG:
2038 fd = open(read_from, O_RDONLY);
2039 if (fd < 0)
2040 die("cannot open %s", read_from);
2041 if (read_in_full(fd, buf, fin_size) != fin_size)
2042 die("cannot read %s", read_from);
2043 break;
2044 case S_IFLNK:
2045 if (readlink(read_from, buf, fin_size+1) != fin_size)
2046 die("cannot readlink %s", read_from);
2047 break;
2048 default:
2049 die("unsupported file type %s", read_from);
2052 else {
2053 /* Reading from stdin */
2054 contents_from = "standard input";
2055 buf = NULL;
2056 fin_size = 0;
2057 mode = 0;
2058 while (1) {
2059 ssize_t cnt = 8192;
2060 buf = xrealloc(buf, fin_size + cnt);
2061 cnt = xread(0, buf + fin_size, cnt);
2062 if (cnt < 0)
2063 die("read error %s from stdin",
2064 strerror(errno));
2065 if (!cnt)
2066 break;
2067 fin_size += cnt;
2069 buf = xrealloc(buf, fin_size + 1);
2071 buf[fin_size] = 0;
2072 origin->file.ptr = buf;
2073 origin->file.size = fin_size;
2074 pretend_sha1_file(buf, fin_size, OBJ_BLOB, origin->blob_sha1);
2075 commit->util = origin;
2078 * Read the current index, replace the path entry with
2079 * origin->blob_sha1 without mucking with its mode or type
2080 * bits; we are not going to write this index out -- we just
2081 * want to run "diff-index --cached".
2083 discard_cache();
2084 read_cache();
2086 len = strlen(path);
2087 if (!mode) {
2088 int pos = cache_name_pos(path, len);
2089 if (0 <= pos)
2090 mode = ntohl(active_cache[pos]->ce_mode);
2091 else
2092 /* Let's not bother reading from HEAD tree */
2093 mode = S_IFREG | 0644;
2095 size = cache_entry_size(len);
2096 ce = xcalloc(1, size);
2097 hashcpy(ce->sha1, origin->blob_sha1);
2098 memcpy(ce->name, path, len);
2099 ce->ce_flags = create_ce_flags(len, 0);
2100 ce->ce_mode = create_ce_mode(mode);
2101 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
2104 * We are not going to write this out, so this does not matter
2105 * right now, but someday we might optimize diff-index --cached
2106 * with cache-tree information.
2108 cache_tree_invalidate_path(active_cache_tree, path);
2110 commit->buffer = xmalloc(400);
2111 ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
2112 snprintf(commit->buffer, 400,
2113 "tree 0000000000000000000000000000000000000000\n"
2114 "parent %s\n"
2115 "author %s\n"
2116 "committer %s\n\n"
2117 "Version of %s from %s\n",
2118 sha1_to_hex(head_sha1),
2119 ident, ident, path, contents_from ? contents_from : path);
2120 return commit;
2123 int cmd_blame(int argc, const char **argv, const char *prefix)
2125 struct rev_info revs;
2126 const char *path;
2127 struct scoreboard sb;
2128 struct origin *o;
2129 struct blame_entry *ent;
2130 int i, seen_dashdash, unk, opt;
2131 long bottom, top, lno;
2132 int output_option = 0;
2133 int show_stats = 0;
2134 const char *revs_file = NULL;
2135 const char *final_commit_name = NULL;
2136 enum object_type type;
2137 const char *bottomtop = NULL;
2138 const char *contents_from = NULL;
2140 cmd_is_annotate = !strcmp(argv[0], "annotate");
2142 git_config(git_blame_config);
2143 save_commit_buffer = 0;
2145 opt = 0;
2146 seen_dashdash = 0;
2147 for (unk = i = 1; i < argc; i++) {
2148 const char *arg = argv[i];
2149 if (*arg != '-')
2150 break;
2151 else if (!strcmp("-b", arg))
2152 blank_boundary = 1;
2153 else if (!strcmp("--root", arg))
2154 show_root = 1;
2155 else if (!strcmp(arg, "--show-stats"))
2156 show_stats = 1;
2157 else if (!strcmp("-c", arg))
2158 output_option |= OUTPUT_ANNOTATE_COMPAT;
2159 else if (!strcmp("-t", arg))
2160 output_option |= OUTPUT_RAW_TIMESTAMP;
2161 else if (!strcmp("-l", arg))
2162 output_option |= OUTPUT_LONG_OBJECT_NAME;
2163 else if (!strcmp("-s", arg))
2164 output_option |= OUTPUT_NO_AUTHOR;
2165 else if (!strcmp("-w", arg))
2166 xdl_opts |= XDF_IGNORE_WHITESPACE;
2167 else if (!strcmp("-S", arg) && ++i < argc)
2168 revs_file = argv[i];
2169 else if (!prefixcmp(arg, "-M")) {
2170 opt |= PICKAXE_BLAME_MOVE;
2171 blame_move_score = parse_score(arg+2);
2173 else if (!prefixcmp(arg, "-C")) {
2175 * -C enables copy from removed files;
2176 * -C -C enables copy from existing files, but only
2177 * when blaming a new file;
2178 * -C -C -C enables copy from existing files for
2179 * everybody
2181 if (opt & PICKAXE_BLAME_COPY_HARDER)
2182 opt |= PICKAXE_BLAME_COPY_HARDEST;
2183 if (opt & PICKAXE_BLAME_COPY)
2184 opt |= PICKAXE_BLAME_COPY_HARDER;
2185 opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
2186 blame_copy_score = parse_score(arg+2);
2188 else if (!prefixcmp(arg, "-L")) {
2189 if (!arg[2]) {
2190 if (++i >= argc)
2191 usage(blame_usage);
2192 arg = argv[i];
2194 else
2195 arg += 2;
2196 if (bottomtop)
2197 die("More than one '-L n,m' option given");
2198 bottomtop = arg;
2200 else if (!strcmp("--contents", arg)) {
2201 if (++i >= argc)
2202 usage(blame_usage);
2203 contents_from = argv[i];
2205 else if (!strcmp("--incremental", arg))
2206 incremental = 1;
2207 else if (!strcmp("--score-debug", arg))
2208 output_option |= OUTPUT_SHOW_SCORE;
2209 else if (!strcmp("-f", arg) ||
2210 !strcmp("--show-name", arg))
2211 output_option |= OUTPUT_SHOW_NAME;
2212 else if (!strcmp("-n", arg) ||
2213 !strcmp("--show-number", arg))
2214 output_option |= OUTPUT_SHOW_NUMBER;
2215 else if (!strcmp("-p", arg) ||
2216 !strcmp("--porcelain", arg))
2217 output_option |= OUTPUT_PORCELAIN;
2218 else if (!strcmp("--", arg)) {
2219 seen_dashdash = 1;
2220 i++;
2221 break;
2223 else
2224 argv[unk++] = arg;
2227 if (!incremental)
2228 setup_pager();
2230 if (!blame_move_score)
2231 blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
2232 if (!blame_copy_score)
2233 blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
2236 * We have collected options unknown to us in argv[1..unk]
2237 * which are to be passed to revision machinery if we are
2238 * going to do the "bottom" processing.
2240 * The remaining are:
2242 * (1) if seen_dashdash, its either
2243 * "-options -- <path>" or
2244 * "-options -- <path> <rev>".
2245 * but the latter is allowed only if there is no
2246 * options that we passed to revision machinery.
2248 * (2) otherwise, we may have "--" somewhere later and
2249 * might be looking at the first one of multiple 'rev'
2250 * parameters (e.g. " master ^next ^maint -- path").
2251 * See if there is a dashdash first, and give the
2252 * arguments before that to revision machinery.
2253 * After that there must be one 'path'.
2255 * (3) otherwise, its one of the three:
2256 * "-options <path> <rev>"
2257 * "-options <rev> <path>"
2258 * "-options <path>"
2259 * but again the first one is allowed only if
2260 * there is no options that we passed to revision
2261 * machinery.
2264 if (seen_dashdash) {
2265 /* (1) */
2266 if (argc <= i)
2267 usage(blame_usage);
2268 path = add_prefix(prefix, argv[i]);
2269 if (i + 1 == argc - 1) {
2270 if (unk != 1)
2271 usage(blame_usage);
2272 argv[unk++] = argv[i + 1];
2274 else if (i + 1 != argc)
2275 /* garbage at end */
2276 usage(blame_usage);
2278 else {
2279 int j;
2280 for (j = i; !seen_dashdash && j < argc; j++)
2281 if (!strcmp(argv[j], "--"))
2282 seen_dashdash = j;
2283 if (seen_dashdash) {
2284 /* (2) */
2285 if (seen_dashdash + 1 != argc - 1)
2286 usage(blame_usage);
2287 path = add_prefix(prefix, argv[seen_dashdash + 1]);
2288 for (j = i; j < seen_dashdash; j++)
2289 argv[unk++] = argv[j];
2291 else {
2292 /* (3) */
2293 if (argc <= i)
2294 usage(blame_usage);
2295 path = add_prefix(prefix, argv[i]);
2296 if (i + 1 == argc - 1) {
2297 final_commit_name = argv[i + 1];
2299 /* if (unk == 1) we could be getting
2300 * old-style
2302 if (unk == 1 && !has_path_in_work_tree(path)) {
2303 path = add_prefix(prefix, argv[i + 1]);
2304 final_commit_name = argv[i];
2307 else if (i != argc - 1)
2308 usage(blame_usage); /* garbage at end */
2310 if (!has_path_in_work_tree(path))
2311 die("cannot stat path %s: %s",
2312 path, strerror(errno));
2316 if (final_commit_name)
2317 argv[unk++] = final_commit_name;
2320 * Now we got rev and path. We do not want the path pruning
2321 * but we may want "bottom" processing.
2323 argv[unk++] = "--"; /* terminate the rev name */
2324 argv[unk] = NULL;
2326 init_revisions(&revs, NULL);
2327 setup_revisions(unk, argv, &revs, NULL);
2328 memset(&sb, 0, sizeof(sb));
2331 * There must be one and only one positive commit in the
2332 * revs->pending array.
2334 for (i = 0; i < revs.pending.nr; i++) {
2335 struct object *obj = revs.pending.objects[i].item;
2336 if (obj->flags & UNINTERESTING)
2337 continue;
2338 while (obj->type == OBJ_TAG)
2339 obj = deref_tag(obj, NULL, 0);
2340 if (obj->type != OBJ_COMMIT)
2341 die("Non commit %s?",
2342 revs.pending.objects[i].name);
2343 if (sb.final)
2344 die("More than one commit to dig from %s and %s?",
2345 revs.pending.objects[i].name,
2346 final_commit_name);
2347 sb.final = (struct commit *) obj;
2348 final_commit_name = revs.pending.objects[i].name;
2351 if (!sb.final) {
2353 * "--not A B -- path" without anything positive;
2354 * do not default to HEAD, but use the working tree
2355 * or "--contents".
2357 sb.final = fake_working_tree_commit(path, contents_from);
2358 add_pending_object(&revs, &(sb.final->object), ":");
2360 else if (contents_from)
2361 die("Cannot use --contents with final commit object name");
2364 * If we have bottom, this will mark the ancestors of the
2365 * bottom commits we would reach while traversing as
2366 * uninteresting.
2368 prepare_revision_walk(&revs);
2370 if (is_null_sha1(sb.final->object.sha1)) {
2371 char *buf;
2372 o = sb.final->util;
2373 buf = xmalloc(o->file.size + 1);
2374 memcpy(buf, o->file.ptr, o->file.size + 1);
2375 sb.final_buf = buf;
2376 sb.final_buf_size = o->file.size;
2378 else {
2379 o = get_origin(&sb, sb.final, path);
2380 if (fill_blob_sha1(o))
2381 die("no such path %s in %s", path, final_commit_name);
2383 sb.final_buf = read_sha1_file(o->blob_sha1, &type,
2384 &sb.final_buf_size);
2386 num_read_blob++;
2387 lno = prepare_lines(&sb);
2389 bottom = top = 0;
2390 if (bottomtop)
2391 prepare_blame_range(&sb, bottomtop, lno, &bottom, &top);
2392 if (bottom && top && top < bottom) {
2393 long tmp;
2394 tmp = top; top = bottom; bottom = tmp;
2396 if (bottom < 1)
2397 bottom = 1;
2398 if (top < 1)
2399 top = lno;
2400 bottom--;
2401 if (lno < top)
2402 die("file %s has only %lu lines", path, lno);
2404 ent = xcalloc(1, sizeof(*ent));
2405 ent->lno = bottom;
2406 ent->num_lines = top - bottom;
2407 ent->suspect = o;
2408 ent->s_lno = bottom;
2410 sb.ent = ent;
2411 sb.path = path;
2413 if (revs_file && read_ancestry(revs_file))
2414 die("reading graft file %s failed: %s",
2415 revs_file, strerror(errno));
2417 read_mailmap(&mailmap, ".mailmap", NULL);
2419 assign_blame(&sb, &revs, opt);
2421 if (incremental)
2422 return 0;
2424 coalesce(&sb);
2426 if (!(output_option & OUTPUT_PORCELAIN))
2427 find_alignment(&sb, &output_option);
2429 output(&sb, output_option);
2430 free((void *)sb.final_buf);
2431 for (ent = sb.ent; ent; ) {
2432 struct blame_entry *e = ent->next;
2433 free(ent);
2434 ent = e;
2437 if (show_stats) {
2438 printf("num read blob: %d\n", num_read_blob);
2439 printf("num get patch: %d\n", num_get_patch);
2440 printf("num commits: %d\n", num_commits);
2442 return 0;