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blame-options.txt: explain that -L <start> and <end> are optional
[git/gitweb.git] / line-log.c
blob4bbb09be59e561b519f63c3685fb790de9e70ded
1 #include "git-compat-util.h"
2 #include "line-range.h"
3 #include "cache.h"
4 #include "tag.h"
5 #include "blob.h"
6 #include "tree.h"
7 #include "diff.h"
8 #include "commit.h"
9 #include "decorate.h"
10 #include "revision.h"
11 #include "xdiff-interface.h"
12 #include "strbuf.h"
13 #include "log-tree.h"
14 #include "graph.h"
15 #include "userdiff.h"
16 #include "line-log.h"
17
18 static void range_set_grow(struct range_set *rs, size_t extra)
19 {
20 ALLOC_GROW(rs->ranges, rs->nr + extra, rs->alloc);
21 }
22
23 /* Either initialization would be fine */
24 #define RANGE_SET_INIT {0}
25
26 static void range_set_init(struct range_set *rs, size_t prealloc)
27 {
28 rs->alloc = rs->nr = 0;
29 rs->ranges = NULL;
30 if (prealloc)
31 range_set_grow(rs, prealloc);
32 }
33
34 static void range_set_release(struct range_set *rs)
35 {
36 free(rs->ranges);
37 rs->alloc = rs->nr = 0;
38 rs->ranges = NULL;
39 }
40
41 /* dst must be uninitialized! */
42 static void range_set_copy(struct range_set *dst, struct range_set *src)
43 {
44 range_set_init(dst, src->nr);
45 memcpy(dst->ranges, src->ranges, src->nr*sizeof(struct range_set));
46 dst->nr = src->nr;
47 }
48 static void range_set_move(struct range_set *dst, struct range_set *src)
49 {
50 range_set_release(dst);
51 dst->ranges = src->ranges;
52 dst->nr = src->nr;
53 dst->alloc = src->alloc;
54 src->ranges = NULL;
55 src->alloc = src->nr = 0;
56 }
57
58 /* tack on a _new_ range _at the end_ */
59 static void range_set_append_unsafe(struct range_set *rs, long a, long b)
60 {
61 assert(a <= b);
62 range_set_grow(rs, 1);
63 rs->ranges[rs->nr].start = a;
64 rs->ranges[rs->nr].end = b;
65 rs->nr++;
66 }
67
68 static void range_set_append(struct range_set *rs, long a, long b)
69 {
70 assert(rs->nr == 0 || rs->ranges[rs->nr-1].end <= a);
71 range_set_append_unsafe(rs, a, b);
72 }
73
74 static int range_cmp(const void *_r, const void *_s)
75 {
76 const struct range *r = _r;
77 const struct range *s = _s;
78
79 /* this could be simply 'return r.start-s.start', but for the types */
80 if (r->start == s->start)
81 return 0;
82 if (r->start < s->start)
83 return -1;
84 return 1;
85 }
86
87 /*
88 * Check that the ranges are non-empty, sorted and non-overlapping
89 */
90 static void range_set_check_invariants(struct range_set *rs)
91 {
92 int i;
93
94 if (!rs)
95 return;
96
97 if (rs->nr)
98 assert(rs->ranges[0].start < rs->ranges[0].end);
99
100 for (i = 1; i < rs->nr; i++) {
101 assert(rs->ranges[i-1].end < rs->ranges[i].start);
102 assert(rs->ranges[i].start < rs->ranges[i].end);
103 }
104 }
105
106 /*
107 * In-place pass of sorting and merging the ranges in the range set,
108 * to establish the invariants when we get the ranges from the user
109 */
110 static void sort_and_merge_range_set(struct range_set *rs)
111 {
112 int i;
113 int o = 1; /* output cursor */
114
115 qsort(rs->ranges, rs->nr, sizeof(struct range), range_cmp);
116
117 for (i = 1; i < rs->nr; i++) {
118 if (rs->ranges[i].start <= rs->ranges[o-1].end) {
119 rs->ranges[o-1].end = rs->ranges[i].end;
120 } else {
121 rs->ranges[o].start = rs->ranges[i].start;
122 rs->ranges[o].end = rs->ranges[i].end;
123 o++;
124 }
125 }
126 assert(o <= rs->nr);
127 rs->nr = o;
128
129 range_set_check_invariants(rs);
130 }
131
132 /*
133 * Union of range sets (i.e., sets of line numbers). Used to merge
134 * them when searches meet at a common ancestor.
135 *
136 * This is also where the ranges are consolidated into canonical form:
137 * overlapping and adjacent ranges are merged, and empty ranges are
138 * removed.
139 */
140 static void range_set_union(struct range_set *out,
141 struct range_set *a, struct range_set *b)
142 {
143 int i = 0, j = 0, o = 0;
144 struct range *ra = a->ranges;
145 struct range *rb = b->ranges;
146 /* cannot make an alias of out->ranges: it may change during grow */
147
148 assert(out->nr == 0);
149 while (i < a->nr || j < b->nr) {
150 struct range *new;
151 if (i < a->nr && j < b->nr) {
152 if (ra[i].start < rb[j].start)
153 new = &ra[i++];
154 else if (ra[i].start > rb[j].start)
155 new = &rb[j++];
156 else if (ra[i].end < rb[j].end)
157 new = &ra[i++];
158 else
159 new = &rb[j++];
160 } else if (i < a->nr) /* b exhausted */
161 new = &ra[i++];
162 else /* a exhausted */
163 new = &rb[j++];
164 if (new->start == new->end)
165 ; /* empty range */
166 else if (!o || out->ranges[o-1].end < new->start) {
167 range_set_grow(out, 1);
168 out->ranges[o].start = new->start;
169 out->ranges[o].end = new->end;
170 o++;
171 } else if (out->ranges[o-1].end < new->end) {
172 out->ranges[o-1].end = new->end;
173 }
174 }
175 out->nr = o;
176 }
177
178 /*
179 * Difference of range sets (out = a \ b). Pass the "interesting"
180 * ranges as 'a' and the target side of the diff as 'b': it removes
181 * the ranges for which the commit is responsible.
182 */
183 static void range_set_difference(struct range_set *out,
184 struct range_set *a, struct range_set *b)
185 {
186 int i, j = 0;
187 for (i = 0; i < a->nr; i++) {
188 long start = a->ranges[i].start;
189 long end = a->ranges[i].end;
190 while (start < end) {
191 while (j < b->nr && start >= b->ranges[j].end)
192 /*
193 * a: |-------
194 * b: ------|
195 */
196 j++;
197 if (j >= b->nr || end < b->ranges[j].start) {
198 /*
199 * b exhausted, or
200 * a: ----|
201 * b: |----
202 */
203 range_set_append(out, start, end);
204 break;
205 }
206 if (start >= b->ranges[j].start) {
207 /*
208 * a: |--????
209 * b: |------|
210 */
211 start = b->ranges[j].end;
212 } else if (end > b->ranges[j].start) {
213 /*
214 * a: |-----|
215 * b: |--?????
216 */
217 if (start < b->ranges[j].start)
218 range_set_append(out, start, b->ranges[j].start);
219 start = b->ranges[j].end;
220 }
221 }
222 }
223 }
224
225 static void diff_ranges_init(struct diff_ranges *diff)
226 {
227 range_set_init(&diff->parent, 0);
228 range_set_init(&diff->target, 0);
229 }
230
231 static void diff_ranges_release(struct diff_ranges *diff)
232 {
233 range_set_release(&diff->parent);
234 range_set_release(&diff->target);
235 }
236
237 void line_log_data_init(struct line_log_data *r)
238 {
239 memset(r, 0, sizeof(struct line_log_data));
240 range_set_init(&r->ranges, 0);
241 }
242
243 static void line_log_data_clear(struct line_log_data *r)
244 {
245 range_set_release(&r->ranges);
246 if (r->pair)
247 diff_free_filepair(r->pair);
248 }
249
250 static void free_line_log_data(struct line_log_data *r)
251 {
252 while (r) {
253 struct line_log_data *next = r->next;
254 line_log_data_clear(r);
255 free(r);
256 r = next;
257 }
258 }
259
260 static struct line_log_data *
261 search_line_log_data(struct line_log_data *list, const char *path,
262 struct line_log_data **insertion_point)
263 {
264 struct line_log_data *p = list;
265 if (insertion_point)
266 *insertion_point = NULL;
267 while (p) {
268 int cmp = strcmp(p->path, path);
269 if (!cmp)
270 return p;
271 if (insertion_point && cmp < 0)
272 *insertion_point = p;
273 p = p->next;
274 }
275 return NULL;
276 }
277
278 /*
279 * Note: takes ownership of 'path', which happens to be what the only
280 * caller needs.
281 */
282 static void line_log_data_insert(struct line_log_data **list,
283 char *path,
284 long begin, long end)
285 {
286 struct line_log_data *ip;
287 struct line_log_data *p = search_line_log_data(*list, path, &ip);
288
289 if (p) {
290 range_set_append_unsafe(&p->ranges, begin, end);
291 sort_and_merge_range_set(&p->ranges);
292 free(path);
293 return;
294 }
295
296 p = xcalloc(1, sizeof(struct line_log_data));
297 p->path = path;
298 range_set_append(&p->ranges, begin, end);
299 if (ip) {
300 p->next = ip->next;
301 ip->next = p;
302 } else {
303 p->next = *list;
304 *list = p;
305 }
306 }
307
308 struct collect_diff_cbdata {
309 struct diff_ranges *diff;
310 };
311
312 static int collect_diff_cb(long start_a, long count_a,
313 long start_b, long count_b,
314 void *data)
315 {
316 struct collect_diff_cbdata *d = data;
317
318 if (count_a >= 0)
319 range_set_append(&d->diff->parent, start_a, start_a + count_a);
320 if (count_b >= 0)
321 range_set_append(&d->diff->target, start_b, start_b + count_b);
322
323 return 0;
324 }
325
326 static void collect_diff(mmfile_t *parent, mmfile_t *target, struct diff_ranges *out)
327 {
328 struct collect_diff_cbdata cbdata = {NULL};
329 xpparam_t xpp;
330 xdemitconf_t xecfg;
331 xdemitcb_t ecb;
332
333 memset(&xpp, 0, sizeof(xpp));
334 memset(&xecfg, 0, sizeof(xecfg));
335 xecfg.ctxlen = xecfg.interhunkctxlen = 0;
336
337 cbdata.diff = out;
338 xecfg.hunk_func = collect_diff_cb;
339 memset(&ecb, 0, sizeof(ecb));
340 ecb.priv = &cbdata;
341 xdi_diff(parent, target, &xpp, &xecfg, &ecb);
342 }
343
344 /*
345 * These are handy for debugging. Removing them with #if 0 silences
346 * the "unused function" warning.
347 */
348 #if 0
349 static void dump_range_set(struct range_set *rs, const char *desc)
350 {
351 int i;
352 printf("range set %s (%d items):\n", desc, rs->nr);
353 for (i = 0; i < rs->nr; i++)
354 printf("\t[%ld,%ld]\n", rs->ranges[i].start, rs->ranges[i].end);
355 }
356
357 static void dump_line_log_data(struct line_log_data *r)
358 {
359 char buf[4096];
360 while (r) {
361 snprintf(buf, 4096, "file %s\n", r->path);
362 dump_range_set(&r->ranges, buf);
363 r = r->next;
364 }
365 }
366
367 static void dump_diff_ranges(struct diff_ranges *diff, const char *desc)
368 {
369 int i;
370 assert(diff->parent.nr == diff->target.nr);
371 printf("diff ranges %s (%d items):\n", desc, diff->parent.nr);
372 printf("\tparent\ttarget\n");
373 for (i = 0; i < diff->parent.nr; i++) {
374 printf("\t[%ld,%ld]\t[%ld,%ld]\n",
375 diff->parent.ranges[i].start,
376 diff->parent.ranges[i].end,
377 diff->target.ranges[i].start,
378 diff->target.ranges[i].end);
379 }
380 }
381 #endif
382
383
384 static int ranges_overlap(struct range *a, struct range *b)
385 {
386 return !(a->end <= b->start || b->end <= a->start);
387 }
388
389 /*
390 * Given a diff and the set of interesting ranges, determine all hunks
391 * of the diff which touch (overlap) at least one of the interesting
392 * ranges in the target.
393 */
394 static void diff_ranges_filter_touched(struct diff_ranges *out,
395 struct diff_ranges *diff,
396 struct range_set *rs)
397 {
398 int i, j = 0;
399
400 assert(out->target.nr == 0);
401
402 for (i = 0; i < diff->target.nr; i++) {
403 while (diff->target.ranges[i].start > rs->ranges[j].end) {
404 j++;
405 if (j == rs->nr)
406 return;
407 }
408 if (ranges_overlap(&diff->target.ranges[i], &rs->ranges[j])) {
409 range_set_append(&out->parent,
410 diff->parent.ranges[i].start,
411 diff->parent.ranges[i].end);
412 range_set_append(&out->target,
413 diff->target.ranges[i].start,
414 diff->target.ranges[i].end);
415 }
416 }
417 }
418
419 /*
420 * Adjust the line counts in 'rs' to account for the lines
421 * added/removed in the diff.
422 */
423 static void range_set_shift_diff(struct range_set *out,
424 struct range_set *rs,
425 struct diff_ranges *diff)
426 {
427 int i, j = 0;
428 long offset = 0;
429 struct range *src = rs->ranges;
430 struct range *target = diff->target.ranges;
431 struct range *parent = diff->parent.ranges;
432
433 for (i = 0; i < rs->nr; i++) {
434 while (j < diff->target.nr && src[i].start >= target[j].start) {
435 offset += (parent[j].end-parent[j].start)
436 - (target[j].end-target[j].start);
437 j++;
438 }
439 range_set_append(out, src[i].start+offset, src[i].end+offset);
440 }
441 }
442
443 /*
444 * Given a diff and the set of interesting ranges, map the ranges
445 * across the diff. That is: observe that the target commit takes
446 * blame for all the + (target-side) ranges. So for every pair of
447 * ranges in the diff that was touched, we remove the latter and add
448 * its parent side.
449 */
450 static void range_set_map_across_diff(struct range_set *out,
451 struct range_set *rs,
452 struct diff_ranges *diff,
453 struct diff_ranges **touched_out)
454 {
455 struct diff_ranges *touched = xmalloc(sizeof(*touched));
456 struct range_set tmp1 = RANGE_SET_INIT;
457 struct range_set tmp2 = RANGE_SET_INIT;
458
459 diff_ranges_init(touched);
460 diff_ranges_filter_touched(touched, diff, rs);
461 range_set_difference(&tmp1, rs, &touched->target);
462 range_set_shift_diff(&tmp2, &tmp1, diff);
463 range_set_union(out, &tmp2, &touched->parent);
464 range_set_release(&tmp1);
465 range_set_release(&tmp2);
466
467 *touched_out = touched;
468 }
469
470 static struct commit *check_single_commit(struct rev_info *revs)
471 {
472 struct object *commit = NULL;
473 int found = -1;
474 int i;
475
476 for (i = 0; i < revs->pending.nr; i++) {
477 struct object *obj = revs->pending.objects[i].item;
478 if (obj->flags & UNINTERESTING)
479 continue;
480 while (obj->type == OBJ_TAG)
481 obj = deref_tag(obj, NULL, 0);
482 if (obj->type != OBJ_COMMIT)
483 die("Non commit %s?", revs->pending.objects[i].name);
484 if (commit)
485 die("More than one commit to dig from: %s and %s?",
486 revs->pending.objects[i].name,
487 revs->pending.objects[found].name);
488 commit = obj;
489 found = i;
490 }
491
492 if (!commit)
493 die("No commit specified?");
494
495 return (struct commit *) commit;
496 }
497
498 static void fill_blob_sha1(struct commit *commit, struct diff_filespec *spec)
499 {
500 unsigned mode;
501 unsigned char sha1[20];
502
503 if (get_tree_entry(commit->object.sha1, spec->path,
504 sha1, &mode))
505 die("There is no path %s in the commit", spec->path);
506 fill_filespec(spec, sha1, 1, mode);
507
508 return;
509 }
510
511 static void fill_line_ends(struct diff_filespec *spec, long *lines,
512 unsigned long **line_ends)
513 {
514 int num = 0, size = 50;
515 long cur = 0;
516 unsigned long *ends = NULL;
517 char *data = NULL;
518
519 if (diff_populate_filespec(spec, 0))
520 die("Cannot read blob %s", sha1_to_hex(spec->sha1));
521
522 ends = xmalloc(size * sizeof(*ends));
523 ends[cur++] = 0;
524 data = spec->data;
525 while (num < spec->size) {
526 if (data[num] == '\n' || num == spec->size - 1) {
527 ALLOC_GROW(ends, (cur + 1), size);
528 ends[cur++] = num;
529 }
530 num++;
531 }
532
533 /* shrink the array to fit the elements */
534 ends = xrealloc(ends, cur * sizeof(*ends));
535 *lines = cur-1;
536 *line_ends = ends;
537 }
538
539 struct nth_line_cb {
540 struct diff_filespec *spec;
541 long lines;
542 unsigned long *line_ends;
543 };
544
545 static const char *nth_line(void *data, long line)
546 {
547 struct nth_line_cb *d = data;
548 assert(d && line <= d->lines);
549 assert(d->spec && d->spec->data);
550
551 if (line == 0)
552 return (char *)d->spec->data;
553 else
554 return (char *)d->spec->data + d->line_ends[line] + 1;
555 }
556
557 static struct line_log_data *
558 parse_lines(struct commit *commit, const char *prefix, struct string_list *args)
559 {
560 long lines = 0;
561 unsigned long *ends = NULL;
562 struct nth_line_cb cb_data;
563 struct string_list_item *item;
564 struct line_log_data *ranges = NULL;
565
566 for_each_string_list_item(item, args) {
567 const char *name_part, *range_part;
568 char *full_name;
569 struct diff_filespec *spec;
570 long begin = 0, end = 0;
571
572 name_part = skip_range_arg(item->string);
573 if (!name_part || *name_part != ':' || !name_part[1])
574 die("-L argument '%s' not of the form start,end:file",
575 item->string);
576 range_part = xstrndup(item->string, name_part - item->string);
577 name_part++;
578
579 full_name = prefix_path(prefix, prefix ? strlen(prefix) : 0,
580 name_part);
581
582 spec = alloc_filespec(full_name);
583 fill_blob_sha1(commit, spec);
584 fill_line_ends(spec, &lines, &ends);
585 cb_data.spec = spec;
586 cb_data.lines = lines;
587 cb_data.line_ends = ends;
588
589 if (parse_range_arg(range_part, nth_line, &cb_data,
590 lines, &begin, &end,
591 full_name))
592 die("malformed -L argument '%s'", range_part);
593 if (begin < 1)
594 begin = 1;
595 if (end < 1)
596 end = lines;
597 begin--;
598 if (lines < end || lines < begin)
599 die("file %s has only %ld lines", name_part, lines);
600 line_log_data_insert(&ranges, full_name, begin, end);
601
602 free_filespec(spec);
603 free(ends);
604 ends = NULL;
605 }
606
607 return ranges;
608 }
609
610 static struct line_log_data *line_log_data_copy_one(struct line_log_data *r)
611 {
612 struct line_log_data *ret = xmalloc(sizeof(*ret));
613
614 assert(r);
615 line_log_data_init(ret);
616 range_set_copy(&ret->ranges, &r->ranges);
617
618 ret->path = xstrdup(r->path);
619
620 return ret;
621 }
622
623 static struct line_log_data *
624 line_log_data_copy(struct line_log_data *r)
625 {
626 struct line_log_data *ret = NULL;
627 struct line_log_data *tmp = NULL, *prev = NULL;
628
629 assert(r);
630 ret = tmp = prev = line_log_data_copy_one(r);
631 r = r->next;
632 while (r) {
633 tmp = line_log_data_copy_one(r);
634 prev->next = tmp;
635 prev = tmp;
636 r = r->next;
637 }
638
639 return ret;
640 }
641
642 /* merge two range sets across files */
643 static struct line_log_data *line_log_data_merge(struct line_log_data *a,
644 struct line_log_data *b)
645 {
646 struct line_log_data *head = NULL, **pp = &head;
647
648 while (a || b) {
649 struct line_log_data *src;
650 struct line_log_data *src2 = NULL;
651 struct line_log_data *d;
652 int cmp;
653 if (!a)
654 cmp = 1;
655 else if (!b)
656 cmp = -1;
657 else
658 cmp = strcmp(a->path, b->path);
659 if (cmp < 0) {
660 src = a;
661 a = a->next;
662 } else if (cmp == 0) {
663 src = a;
664 a = a->next;
665 src2 = b;
666 b = b->next;
667 } else {
668 src = b;
669 b = b->next;
670 }
671 d = xmalloc(sizeof(struct line_log_data));
672 line_log_data_init(d);
673 d->path = xstrdup(src->path);
674 *pp = d;
675 pp = &d->next;
676 if (src2)
677 range_set_union(&d->ranges, &src->ranges, &src2->ranges);
678 else
679 range_set_copy(&d->ranges, &src->ranges);
680 }
681
682 return head;
683 }
684
685 static void add_line_range(struct rev_info *revs, struct commit *commit,
686 struct line_log_data *range)
687 {
688 struct line_log_data *old = NULL;
689 struct line_log_data *new = NULL;
690
691 old = lookup_decoration(&revs->line_log_data, &commit->object);
692 if (old && range) {
693 new = line_log_data_merge(old, range);
694 free_line_log_data(old);
695 } else if (range)
696 new = line_log_data_copy(range);
697
698 if (new)
699 add_decoration(&revs->line_log_data, &commit->object, new);
700 }
701
702 static void clear_commit_line_range(struct rev_info *revs, struct commit *commit)
703 {
704 struct line_log_data *r;
705 r = lookup_decoration(&revs->line_log_data, &commit->object);
706 if (!r)
707 return;
708 free_line_log_data(r);
709 add_decoration(&revs->line_log_data, &commit->object, NULL);
710 }
711
712 static struct line_log_data *lookup_line_range(struct rev_info *revs,
713 struct commit *commit)
714 {
715 struct line_log_data *ret = NULL;
716 struct line_log_data *d;
717
718 ret = lookup_decoration(&revs->line_log_data, &commit->object);
719
720 for (d = ret; d; d = d->next)
721 range_set_check_invariants(&d->ranges);
722
723 return ret;
724 }
725
726 void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
727 {
728 struct commit *commit = NULL;
729 struct line_log_data *range;
730
731 commit = check_single_commit(rev);
732 range = parse_lines(commit, prefix, args);
733 add_line_range(rev, commit, range);
734
735 if (!rev->diffopt.detect_rename) {
736 int i, count = 0;
737 struct line_log_data *r = range;
738 const char **paths;
739 while (r) {
740 count++;
741 r = r->next;
742 }
743 paths = xmalloc((count+1)*sizeof(char *));
744 r = range;
745 for (i = 0; i < count; i++) {
746 paths[i] = xstrdup(r->path);
747 r = r->next;
748 }
749 paths[count] = NULL;
750 init_pathspec(&rev->diffopt.pathspec, paths);
751 free(paths);
752 }
753 }
754
755 static void load_tree_desc(struct tree_desc *desc, void **tree,
756 const unsigned char *sha1)
757 {
758 unsigned long size;
759 *tree = read_object_with_reference(sha1, tree_type, &size, NULL);
760 if (!*tree)
761 die("Unable to read tree (%s)", sha1_to_hex(sha1));
762 init_tree_desc(desc, *tree, size);
763 }
764
765 static int count_parents(struct commit *commit)
766 {
767 struct commit_list *parents = commit->parents;
768 int count = 0;
769 while (parents) {
770 count++;
771 parents = parents->next;
772 }
773 return count;
774 }
775
776 static void move_diff_queue(struct diff_queue_struct *dst,
777 struct diff_queue_struct *src)
778 {
779 assert(src != dst);
780 memcpy(dst, src, sizeof(struct diff_queue_struct));
781 DIFF_QUEUE_CLEAR(src);
782 }
783
784 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
785 {
786 int i;
787 struct diff_queue_struct outq;
788 DIFF_QUEUE_CLEAR(&outq);
789
790 for (i = 0; i < diff_queued_diff.nr; i++) {
791 struct diff_filepair *p = diff_queued_diff.queue[i];
792 struct line_log_data *rg = NULL;
793
794 if (!DIFF_FILE_VALID(p->two)) {
795 if (keep_deletions)
796 diff_q(&outq, p);
797 else
798 diff_free_filepair(p);
799 continue;
800 }
801 for (rg = range; rg; rg = rg->next) {
802 if (!strcmp(rg->path, p->two->path))
803 break;
804 }
805 if (rg)
806 diff_q(&outq, p);
807 else
808 diff_free_filepair(p);
809 }
810 free(diff_queued_diff.queue);
811 diff_queued_diff = outq;
812 }
813
814 static inline int diff_might_be_rename(void)
815 {
816 int i;
817 for (i = 0; i < diff_queued_diff.nr; i++)
818 if (!DIFF_FILE_VALID(diff_queued_diff.queue[i]->one)) {
819 /* fprintf(stderr, "diff_might_be_rename found creation of: %s\n", */
820 /* diff_queued_diff.queue[i]->two->path); */
821 return 1;
822 }
823 return 0;
824 }
825
826 static void queue_diffs(struct line_log_data *range,
827 struct diff_options *opt,
828 struct diff_queue_struct *queue,
829 struct commit *commit, struct commit *parent)
830 {
831 void *tree1 = NULL, *tree2 = NULL;
832 struct tree_desc desc1, desc2;
833
834 assert(commit);
835 load_tree_desc(&desc2, &tree2, commit->tree->object.sha1);
836 if (parent)
837 load_tree_desc(&desc1, &tree1, parent->tree->object.sha1);
838 else
839 init_tree_desc(&desc1, "", 0);
840
841 DIFF_QUEUE_CLEAR(&diff_queued_diff);
842 diff_tree(&desc1, &desc2, "", opt);
843 if (opt->detect_rename) {
844 filter_diffs_for_paths(range, 1);
845 if (diff_might_be_rename())
846 diffcore_std(opt);
847 filter_diffs_for_paths(range, 0);
848 }
849 move_diff_queue(queue, &diff_queued_diff);
850
851 if (tree1)
852 free(tree1);
853 if (tree2)
854 free(tree2);
855 }
856
857 static char *get_nth_line(long line, unsigned long *ends, void *data)
858 {
859 if (line == 0)
860 return (char *)data;
861 else
862 return (char *)data + ends[line] + 1;
863 }
864
865 static void print_line(const char *prefix, char first,
866 long line, unsigned long *ends, void *data,
867 const char *color, const char *reset)
868 {
869 char *begin = get_nth_line(line, ends, data);
870 char *end = get_nth_line(line+1, ends, data);
871 int had_nl = 0;
872
873 if (end > begin && end[-1] == '\n') {
874 end--;
875 had_nl = 1;
876 }
877
878 fputs(prefix, stdout);
879 fputs(color, stdout);
880 putchar(first);
881 fwrite(begin, 1, end-begin, stdout);
882 fputs(reset, stdout);
883 putchar('\n');
884 if (!had_nl)
885 fputs("\\ No newline at end of file\n", stdout);
886 }
887
888 static char *output_prefix(struct diff_options *opt)
889 {
890 char *prefix = "";
891
892 if (opt->output_prefix) {
893 struct strbuf *sb = opt->output_prefix(opt, opt->output_prefix_data);
894 prefix = sb->buf;
895 }
896
897 return prefix;
898 }
899
900 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
901 {
902 int i, j = 0;
903 long p_lines, t_lines;
904 unsigned long *p_ends = NULL, *t_ends = NULL;
905 struct diff_filepair *pair = range->pair;
906 struct diff_ranges *diff = &range->diff;
907
908 struct diff_options *opt = &rev->diffopt;
909 char *prefix = output_prefix(opt);
910 const char *c_reset = diff_get_color(opt->use_color, DIFF_RESET);
911 const char *c_frag = diff_get_color(opt->use_color, DIFF_FRAGINFO);
912 const char *c_meta = diff_get_color(opt->use_color, DIFF_METAINFO);
913 const char *c_old = diff_get_color(opt->use_color, DIFF_FILE_OLD);
914 const char *c_new = diff_get_color(opt->use_color, DIFF_FILE_NEW);
915 const char *c_plain = diff_get_color(opt->use_color, DIFF_PLAIN);
916
917 if (!pair || !diff)
918 return;
919
920 if (pair->one->sha1_valid)
921 fill_line_ends(pair->one, &p_lines, &p_ends);
922 fill_line_ends(pair->two, &t_lines, &t_ends);
923
924 printf("%s%sdiff --git a/%s b/%s%s\n", prefix, c_meta, pair->one->path, pair->two->path, c_reset);
925 printf("%s%s--- %s%s%s\n", prefix, c_meta,
926 pair->one->sha1_valid ? "a/" : "",
927 pair->one->sha1_valid ? pair->one->path : "/dev/null",
928 c_reset);
929 printf("%s%s+++ b/%s%s\n", prefix, c_meta, pair->two->path, c_reset);
930 for (i = 0; i < range->ranges.nr; i++) {
931 long p_start, p_end;
932 long t_start = range->ranges.ranges[i].start;
933 long t_end = range->ranges.ranges[i].end;
934 long t_cur = t_start;
935 int j_last;
936
937 while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
938 j++;
939 if (j == diff->target.nr || diff->target.ranges[j].start > t_end)
940 continue;
941
942 /* Scan ahead to determine the last diff that falls in this range */
943 j_last = j;
944 while (j_last < diff->target.nr && diff->target.ranges[j_last].start < t_end)
945 j_last++;
946 if (j_last > j)
947 j_last--;
948
949 /*
950 * Compute parent hunk headers: we know that the diff
951 * has the correct line numbers (but not all hunks).
952 * So it suffices to shift the start/end according to
953 * the line numbers of the first/last hunk(s) that
954 * fall in this range.
955 */
956 if (t_start < diff->target.ranges[j].start)
957 p_start = diff->parent.ranges[j].start - (diff->target.ranges[j].start-t_start);
958 else
959 p_start = diff->parent.ranges[j].start;
960 if (t_end > diff->target.ranges[j_last].end)
961 p_end = diff->parent.ranges[j_last].end + (t_end-diff->target.ranges[j_last].end);
962 else
963 p_end = diff->parent.ranges[j_last].end;
964
965 if (!p_start && !p_end) {
966 p_start = -1;
967 p_end = -1;
968 }
969
970 /* Now output a diff hunk for this range */
971 printf("%s%s@@ -%ld,%ld +%ld,%ld @@%s\n",
972 prefix, c_frag,
973 p_start+1, p_end-p_start, t_start+1, t_end-t_start,
974 c_reset);
975 while (j < diff->target.nr && diff->target.ranges[j].start < t_end) {
976 int k;
977 for (; t_cur < diff->target.ranges[j].start; t_cur++)
978 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
979 c_plain, c_reset);
980 for (k = diff->parent.ranges[j].start; k < diff->parent.ranges[j].end; k++)
981 print_line(prefix, '-', k, p_ends, pair->one->data,
982 c_old, c_reset);
983 for (; t_cur < diff->target.ranges[j].end && t_cur < t_end; t_cur++)
984 print_line(prefix, '+', t_cur, t_ends, pair->two->data,
985 c_new, c_reset);
986 j++;
987 }
988 for (; t_cur < t_end; t_cur++)
989 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
990 c_plain, c_reset);
991 }
992
993 free(p_ends);
994 free(t_ends);
995 }
996
997 /*
998 * NEEDSWORK: manually building a diff here is not the Right
999 * Thing(tm). log -L should be built into the diff pipeline.
1000 */
1001 static void dump_diff_hacky(struct rev_info *rev, struct line_log_data *range)
1002 {
1003 puts(output_prefix(&rev->diffopt));
1004 while (range) {
1005 dump_diff_hacky_one(rev, range);
1006 range = range->next;
1007 }
1008 }
1009
1010 /*
1011 * Unlike most other functions, this destructively operates on
1012 * 'range'.
1013 */
1014 static int process_diff_filepair(struct rev_info *rev,
1015 struct diff_filepair *pair,
1016 struct line_log_data *range,
1017 struct diff_ranges **diff_out)
1018 {
1019 struct line_log_data *rg = range;
1020 struct range_set tmp;
1021 struct diff_ranges diff;
1022 mmfile_t file_parent, file_target;
1023
1024 assert(pair->two->path);
1025 while (rg) {
1026 assert(rg->path);
1027 if (!strcmp(rg->path, pair->two->path))
1028 break;
1029 rg = rg->next;
1030 }
1031
1032 if (!rg)
1033 return 0;
1034 if (rg->ranges.nr == 0)
1035 return 0;
1036
1037 assert(pair->two->sha1_valid);
1038 diff_populate_filespec(pair->two, 0);
1039 file_target.ptr = pair->two->data;
1040 file_target.size = pair->two->size;
1041
1042 if (pair->one->sha1_valid) {
1043 diff_populate_filespec(pair->one, 0);
1044 file_parent.ptr = pair->one->data;
1045 file_parent.size = pair->one->size;
1046 } else {
1047 file_parent.ptr = "";
1048 file_parent.size = 0;
1049 }
1050
1051 diff_ranges_init(&diff);
1052 collect_diff(&file_parent, &file_target, &diff);
1053
1054 /* NEEDSWORK should apply some heuristics to prevent mismatches */
1055 free(rg->path);
1056 rg->path = xstrdup(pair->one->path);
1057
1058 range_set_init(&tmp, 0);
1059 range_set_map_across_diff(&tmp, &rg->ranges, &diff, diff_out);
1060 range_set_release(&rg->ranges);
1061 range_set_move(&rg->ranges, &tmp);
1062
1063 diff_ranges_release(&diff);
1064
1065 return ((*diff_out)->parent.nr > 0);
1066 }
1067
1068 static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
1069 {
1070 struct diff_filepair *new = xmalloc(sizeof(struct diff_filepair));
1071 new->one = pair->one;
1072 new->two = pair->two;
1073 new->one->count++;
1074 new->two->count++;
1075 return new;
1076 }
1077
1078 static void free_diffqueues(int n, struct diff_queue_struct *dq)
1079 {
1080 int i, j;
1081 for (i = 0; i < n; i++)
1082 for (j = 0; j < dq[i].nr; j++)
1083 diff_free_filepair(dq[i].queue[j]);
1084 free(dq);
1085 }
1086
1087 static int process_all_files(struct line_log_data **range_out,
1088 struct rev_info *rev,
1089 struct diff_queue_struct *queue,
1090 struct line_log_data *range)
1091 {
1092 int i, changed = 0;
1093
1094 *range_out = line_log_data_copy(range);
1095
1096 for (i = 0; i < queue->nr; i++) {
1097 struct diff_ranges *pairdiff = NULL;
1098 struct diff_filepair *pair = queue->queue[i];
1099 if (process_diff_filepair(rev, pair, *range_out, &pairdiff)) {
1100 /*
1101 * Store away the diff for later output. We
1102 * tuck it in the ranges we got as _input_,
1103 * since that's the commit that caused the
1104 * diff.
1105 *
1106 * NEEDSWORK not enough when we get around to
1107 * doing something interesting with merges;
1108 * currently each invocation on a merge parent
1109 * trashes the previous one's diff.
1110 *
1111 * NEEDSWORK tramples over data structures not owned here
1112 */
1113 struct line_log_data *rg = range;
1114 changed++;
1115 while (rg && strcmp(rg->path, pair->two->path))
1116 rg = rg->next;
1117 assert(rg);
1118 rg->pair = diff_filepair_dup(queue->queue[i]);
1119 memcpy(&rg->diff, pairdiff, sizeof(struct diff_ranges));
1120 }
1121 }
1122
1123 return changed;
1124 }
1125
1126 int line_log_print(struct rev_info *rev, struct commit *commit)
1127 {
1128 struct line_log_data *range = lookup_line_range(rev, commit);
1129
1130 show_log(rev);
1131 dump_diff_hacky(rev, range);
1132 return 1;
1133 }
1134
1135 static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *commit,
1136 struct line_log_data *range)
1137 {
1138 struct commit *parent = NULL;
1139 struct diff_queue_struct queue;
1140 struct line_log_data *parent_range;
1141 int changed;
1142
1143 if (commit->parents)
1144 parent = commit->parents->item;
1145
1146 queue_diffs(range, &rev->diffopt, &queue, commit, parent);
1147 changed = process_all_files(&parent_range, rev, &queue, range);
1148 if (parent)
1149 add_line_range(rev, parent, parent_range);
1150 return changed;
1151 }
1152
1153 static int process_ranges_merge_commit(struct rev_info *rev, struct commit *commit,
1154 struct line_log_data *range)
1155 {
1156 struct diff_queue_struct *diffqueues;
1157 struct line_log_data **cand;
1158 struct commit **parents;
1159 struct commit_list *p;
1160 int i;
1161 int nparents = count_parents(commit);
1162
1163 diffqueues = xmalloc(nparents * sizeof(*diffqueues));
1164 cand = xmalloc(nparents * sizeof(*cand));
1165 parents = xmalloc(nparents * sizeof(*parents));
1166
1167 p = commit->parents;
1168 for (i = 0; i < nparents; i++) {
1169 parents[i] = p->item;
1170 p = p->next;
1171 queue_diffs(range, &rev->diffopt, &diffqueues[i], commit, parents[i]);
1172 }
1173
1174 for (i = 0; i < nparents; i++) {
1175 int changed;
1176 cand[i] = NULL;
1177 changed = process_all_files(&cand[i], rev, &diffqueues[i], range);
1178 if (!changed) {
1179 /*
1180 * This parent can take all the blame, so we
1181 * don't follow any other path in history
1182 */
1183 add_line_range(rev, parents[i], cand[i]);
1184 clear_commit_line_range(rev, commit);
1185 commit->parents = xmalloc(sizeof(struct commit_list));
1186 commit->parents->item = parents[i];
1187 commit->parents->next = NULL;
1188 free(parents);
1189 free(cand);
1190 free_diffqueues(nparents, diffqueues);
1191 /* NEEDSWORK leaking like a sieve */
1192 return 0;
1193 }
1194 }
1195
1196 /*
1197 * No single parent took the blame. We add the candidates
1198 * from the above loop to the parents.
1199 */
1200 for (i = 0; i < nparents; i++) {
1201 add_line_range(rev, parents[i], cand[i]);
1202 }
1203
1204 clear_commit_line_range(rev, commit);
1205 free(parents);
1206 free(cand);
1207 free_diffqueues(nparents, diffqueues);
1208 return 1;
1209
1210 /* NEEDSWORK evil merge detection stuff */
1211 /* NEEDSWORK leaking like a sieve */
1212 }
1213
1214 static int process_ranges_arbitrary_commit(struct rev_info *rev, struct commit *commit)
1215 {
1216 struct line_log_data *range = lookup_line_range(rev, commit);
1217 int changed = 0;
1218
1219 if (range) {
1220 if (!commit->parents || !commit->parents->next)
1221 changed = process_ranges_ordinary_commit(rev, commit, range);
1222 else
1223 changed = process_ranges_merge_commit(rev, commit, range);
1224 }
1225
1226 if (!changed)
1227 commit->object.flags |= TREESAME;
1228
1229 return changed;
1230 }
1231
1232 static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
1233 {
1234 for (;;) {
1235 struct commit *p = *pp;
1236 if (p->parents && p->parents->next)
1237 return rewrite_one_ok;
1238 if (p->object.flags & UNINTERESTING)
1239 return rewrite_one_ok;
1240 if (!(p->object.flags & TREESAME))
1241 return rewrite_one_ok;
1242 if (!p->parents)
1243 return rewrite_one_noparents;
1244 *pp = p->parents->item;
1245 }
1246 }
1247
1248 int line_log_filter(struct rev_info *rev)
1249 {
1250 struct commit *commit;
1251 struct commit_list *list = rev->commits;
1252 struct commit_list *out = NULL, **pp = &out;
1253
1254 while (list) {
1255 struct commit_list *to_free = NULL;
1256 commit = list->item;
1257 if (process_ranges_arbitrary_commit(rev, commit)) {
1258 *pp = list;
1259 pp = &list->next;
1260 } else
1261 to_free = list;
1262 list = list->next;
1263 free(to_free);
1264 }
1265 *pp = NULL;
1266
1267 for (list = out; list; list = list->next)
1268 rewrite_parents(rev, list->item, line_log_rewrite_one);
1269
1270 rev->commits = out;
1271
1272 return 0;
1273 }
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