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t8001/t8002: blame: add tests of multiple -L options
[git/debian.git] / line-log.c
blobbdadf35a1eb1c20c883c62675af47ed033876465
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 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 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 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 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 void sort_and_merge_range_set(struct range_set *rs)
111 {
112 int i;
113 int o = 0; /* output cursor */
114
115 qsort(rs->ranges, rs->nr, sizeof(struct range), range_cmp);
116
117 for (i = 0; i < rs->nr; i++) {
118 if (rs->ranges[i].start == rs->ranges[i].end)
119 continue;
120 if (o > 0 && rs->ranges[i].start <= rs->ranges[o-1].end) {
121 if (rs->ranges[o-1].end < rs->ranges[i].end)
122 rs->ranges[o-1].end = rs->ranges[i].end;
123 } else {
124 rs->ranges[o].start = rs->ranges[i].start;
125 rs->ranges[o].end = rs->ranges[i].end;
126 o++;
127 }
128 }
129 assert(o <= rs->nr);
130 rs->nr = o;
131
132 range_set_check_invariants(rs);
133 }
134
135 /*
136 * Union of range sets (i.e., sets of line numbers). Used to merge
137 * them when searches meet at a common ancestor.
138 *
139 * This is also where the ranges are consolidated into canonical form:
140 * overlapping and adjacent ranges are merged, and empty ranges are
141 * removed.
142 */
143 static void range_set_union(struct range_set *out,
144 struct range_set *a, struct range_set *b)
145 {
146 int i = 0, j = 0, o = 0;
147 struct range *ra = a->ranges;
148 struct range *rb = b->ranges;
149 /* cannot make an alias of out->ranges: it may change during grow */
150
151 assert(out->nr == 0);
152 while (i < a->nr || j < b->nr) {
153 struct range *new;
154 if (i < a->nr && j < b->nr) {
155 if (ra[i].start < rb[j].start)
156 new = &ra[i++];
157 else if (ra[i].start > rb[j].start)
158 new = &rb[j++];
159 else if (ra[i].end < rb[j].end)
160 new = &ra[i++];
161 else
162 new = &rb[j++];
163 } else if (i < a->nr) /* b exhausted */
164 new = &ra[i++];
165 else /* a exhausted */
166 new = &rb[j++];
167 if (new->start == new->end)
168 ; /* empty range */
169 else if (!o || out->ranges[o-1].end < new->start) {
170 range_set_grow(out, 1);
171 out->ranges[o].start = new->start;
172 out->ranges[o].end = new->end;
173 o++;
174 } else if (out->ranges[o-1].end < new->end) {
175 out->ranges[o-1].end = new->end;
176 }
177 }
178 out->nr = o;
179 }
180
181 /*
182 * Difference of range sets (out = a \ b). Pass the "interesting"
183 * ranges as 'a' and the target side of the diff as 'b': it removes
184 * the ranges for which the commit is responsible.
185 */
186 static void range_set_difference(struct range_set *out,
187 struct range_set *a, struct range_set *b)
188 {
189 int i, j = 0;
190 for (i = 0; i < a->nr; i++) {
191 long start = a->ranges[i].start;
192 long end = a->ranges[i].end;
193 while (start < end) {
194 while (j < b->nr && start >= b->ranges[j].end)
195 /*
196 * a: |-------
197 * b: ------|
198 */
199 j++;
200 if (j >= b->nr || end < b->ranges[j].start) {
201 /*
202 * b exhausted, or
203 * a: ----|
204 * b: |----
205 */
206 range_set_append(out, start, end);
207 break;
208 }
209 if (start >= b->ranges[j].start) {
210 /*
211 * a: |--????
212 * b: |------|
213 */
214 start = b->ranges[j].end;
215 } else if (end > b->ranges[j].start) {
216 /*
217 * a: |-----|
218 * b: |--?????
219 */
220 if (start < b->ranges[j].start)
221 range_set_append(out, start, b->ranges[j].start);
222 start = b->ranges[j].end;
223 }
224 }
225 }
226 }
227
228 static void diff_ranges_init(struct diff_ranges *diff)
229 {
230 range_set_init(&diff->parent, 0);
231 range_set_init(&diff->target, 0);
232 }
233
234 static void diff_ranges_release(struct diff_ranges *diff)
235 {
236 range_set_release(&diff->parent);
237 range_set_release(&diff->target);
238 }
239
240 void line_log_data_init(struct line_log_data *r)
241 {
242 memset(r, 0, sizeof(struct line_log_data));
243 range_set_init(&r->ranges, 0);
244 }
245
246 static void line_log_data_clear(struct line_log_data *r)
247 {
248 range_set_release(&r->ranges);
249 if (r->pair)
250 diff_free_filepair(r->pair);
251 }
252
253 static void free_line_log_data(struct line_log_data *r)
254 {
255 while (r) {
256 struct line_log_data *next = r->next;
257 line_log_data_clear(r);
258 free(r);
259 r = next;
260 }
261 }
262
263 static struct line_log_data *
264 search_line_log_data(struct line_log_data *list, const char *path,
265 struct line_log_data **insertion_point)
266 {
267 struct line_log_data *p = list;
268 if (insertion_point)
269 *insertion_point = NULL;
270 while (p) {
271 int cmp = strcmp(p->path, path);
272 if (!cmp)
273 return p;
274 if (insertion_point && cmp < 0)
275 *insertion_point = p;
276 p = p->next;
277 }
278 return NULL;
279 }
280
281 /*
282 * Note: takes ownership of 'path', which happens to be what the only
283 * caller needs.
284 */
285 static void line_log_data_insert(struct line_log_data **list,
286 char *path,
287 long begin, long end)
288 {
289 struct line_log_data *ip;
290 struct line_log_data *p = search_line_log_data(*list, path, &ip);
291
292 if (p) {
293 range_set_append_unsafe(&p->ranges, begin, end);
294 sort_and_merge_range_set(&p->ranges);
295 free(path);
296 return;
297 }
298
299 p = xcalloc(1, sizeof(struct line_log_data));
300 p->path = path;
301 range_set_append(&p->ranges, begin, end);
302 sort_and_merge_range_set(&p->ranges);
303 if (ip) {
304 p->next = ip->next;
305 ip->next = p;
306 } else {
307 p->next = *list;
308 *list = p;
309 }
310 }
311
312 struct collect_diff_cbdata {
313 struct diff_ranges *diff;
314 };
315
316 static int collect_diff_cb(long start_a, long count_a,
317 long start_b, long count_b,
318 void *data)
319 {
320 struct collect_diff_cbdata *d = data;
321
322 if (count_a >= 0)
323 range_set_append(&d->diff->parent, start_a, start_a + count_a);
324 if (count_b >= 0)
325 range_set_append(&d->diff->target, start_b, start_b + count_b);
326
327 return 0;
328 }
329
330 static void collect_diff(mmfile_t *parent, mmfile_t *target, struct diff_ranges *out)
331 {
332 struct collect_diff_cbdata cbdata = {NULL};
333 xpparam_t xpp;
334 xdemitconf_t xecfg;
335 xdemitcb_t ecb;
336
337 memset(&xpp, 0, sizeof(xpp));
338 memset(&xecfg, 0, sizeof(xecfg));
339 xecfg.ctxlen = xecfg.interhunkctxlen = 0;
340
341 cbdata.diff = out;
342 xecfg.hunk_func = collect_diff_cb;
343 memset(&ecb, 0, sizeof(ecb));
344 ecb.priv = &cbdata;
345 xdi_diff(parent, target, &xpp, &xecfg, &ecb);
346 }
347
348 /*
349 * These are handy for debugging. Removing them with #if 0 silences
350 * the "unused function" warning.
351 */
352 #if 0
353 static void dump_range_set(struct range_set *rs, const char *desc)
354 {
355 int i;
356 printf("range set %s (%d items):\n", desc, rs->nr);
357 for (i = 0; i < rs->nr; i++)
358 printf("\t[%ld,%ld]\n", rs->ranges[i].start, rs->ranges[i].end);
359 }
360
361 static void dump_line_log_data(struct line_log_data *r)
362 {
363 char buf[4096];
364 while (r) {
365 snprintf(buf, 4096, "file %s\n", r->path);
366 dump_range_set(&r->ranges, buf);
367 r = r->next;
368 }
369 }
370
371 static void dump_diff_ranges(struct diff_ranges *diff, const char *desc)
372 {
373 int i;
374 assert(diff->parent.nr == diff->target.nr);
375 printf("diff ranges %s (%d items):\n", desc, diff->parent.nr);
376 printf("\tparent\ttarget\n");
377 for (i = 0; i < diff->parent.nr; i++) {
378 printf("\t[%ld,%ld]\t[%ld,%ld]\n",
379 diff->parent.ranges[i].start,
380 diff->parent.ranges[i].end,
381 diff->target.ranges[i].start,
382 diff->target.ranges[i].end);
383 }
384 }
385 #endif
386
387
388 static int ranges_overlap(struct range *a, struct range *b)
389 {
390 return !(a->end <= b->start || b->end <= a->start);
391 }
392
393 /*
394 * Given a diff and the set of interesting ranges, determine all hunks
395 * of the diff which touch (overlap) at least one of the interesting
396 * ranges in the target.
397 */
398 static void diff_ranges_filter_touched(struct diff_ranges *out,
399 struct diff_ranges *diff,
400 struct range_set *rs)
401 {
402 int i, j = 0;
403
404 assert(out->target.nr == 0);
405
406 for (i = 0; i < diff->target.nr; i++) {
407 while (diff->target.ranges[i].start > rs->ranges[j].end) {
408 j++;
409 if (j == rs->nr)
410 return;
411 }
412 if (ranges_overlap(&diff->target.ranges[i], &rs->ranges[j])) {
413 range_set_append(&out->parent,
414 diff->parent.ranges[i].start,
415 diff->parent.ranges[i].end);
416 range_set_append(&out->target,
417 diff->target.ranges[i].start,
418 diff->target.ranges[i].end);
419 }
420 }
421 }
422
423 /*
424 * Adjust the line counts in 'rs' to account for the lines
425 * added/removed in the diff.
426 */
427 static void range_set_shift_diff(struct range_set *out,
428 struct range_set *rs,
429 struct diff_ranges *diff)
430 {
431 int i, j = 0;
432 long offset = 0;
433 struct range *src = rs->ranges;
434 struct range *target = diff->target.ranges;
435 struct range *parent = diff->parent.ranges;
436
437 for (i = 0; i < rs->nr; i++) {
438 while (j < diff->target.nr && src[i].start >= target[j].start) {
439 offset += (parent[j].end-parent[j].start)
440 - (target[j].end-target[j].start);
441 j++;
442 }
443 range_set_append(out, src[i].start+offset, src[i].end+offset);
444 }
445 }
446
447 /*
448 * Given a diff and the set of interesting ranges, map the ranges
449 * across the diff. That is: observe that the target commit takes
450 * blame for all the + (target-side) ranges. So for every pair of
451 * ranges in the diff that was touched, we remove the latter and add
452 * its parent side.
453 */
454 static void range_set_map_across_diff(struct range_set *out,
455 struct range_set *rs,
456 struct diff_ranges *diff,
457 struct diff_ranges **touched_out)
458 {
459 struct diff_ranges *touched = xmalloc(sizeof(*touched));
460 struct range_set tmp1 = RANGE_SET_INIT;
461 struct range_set tmp2 = RANGE_SET_INIT;
462
463 diff_ranges_init(touched);
464 diff_ranges_filter_touched(touched, diff, rs);
465 range_set_difference(&tmp1, rs, &touched->target);
466 range_set_shift_diff(&tmp2, &tmp1, diff);
467 range_set_union(out, &tmp2, &touched->parent);
468 range_set_release(&tmp1);
469 range_set_release(&tmp2);
470
471 *touched_out = touched;
472 }
473
474 static struct commit *check_single_commit(struct rev_info *revs)
475 {
476 struct object *commit = NULL;
477 int found = -1;
478 int i;
479
480 for (i = 0; i < revs->pending.nr; i++) {
481 struct object *obj = revs->pending.objects[i].item;
482 if (obj->flags & UNINTERESTING)
483 continue;
484 while (obj->type == OBJ_TAG)
485 obj = deref_tag(obj, NULL, 0);
486 if (obj->type != OBJ_COMMIT)
487 die("Non commit %s?", revs->pending.objects[i].name);
488 if (commit)
489 die("More than one commit to dig from: %s and %s?",
490 revs->pending.objects[i].name,
491 revs->pending.objects[found].name);
492 commit = obj;
493 found = i;
494 }
495
496 if (!commit)
497 die("No commit specified?");
498
499 return (struct commit *) commit;
500 }
501
502 static void fill_blob_sha1(struct commit *commit, struct diff_filespec *spec)
503 {
504 unsigned mode;
505 unsigned char sha1[20];
506
507 if (get_tree_entry(commit->object.sha1, spec->path,
508 sha1, &mode))
509 die("There is no path %s in the commit", spec->path);
510 fill_filespec(spec, sha1, 1, mode);
511
512 return;
513 }
514
515 static void fill_line_ends(struct diff_filespec *spec, long *lines,
516 unsigned long **line_ends)
517 {
518 int num = 0, size = 50;
519 long cur = 0;
520 unsigned long *ends = NULL;
521 char *data = NULL;
522
523 if (diff_populate_filespec(spec, 0))
524 die("Cannot read blob %s", sha1_to_hex(spec->sha1));
525
526 ends = xmalloc(size * sizeof(*ends));
527 ends[cur++] = 0;
528 data = spec->data;
529 while (num < spec->size) {
530 if (data[num] == '\n' || num == spec->size - 1) {
531 ALLOC_GROW(ends, (cur + 1), size);
532 ends[cur++] = num;
533 }
534 num++;
535 }
536
537 /* shrink the array to fit the elements */
538 ends = xrealloc(ends, cur * sizeof(*ends));
539 *lines = cur-1;
540 *line_ends = ends;
541 }
542
543 struct nth_line_cb {
544 struct diff_filespec *spec;
545 long lines;
546 unsigned long *line_ends;
547 };
548
549 static const char *nth_line(void *data, long line)
550 {
551 struct nth_line_cb *d = data;
552 assert(d && line <= d->lines);
553 assert(d->spec && d->spec->data);
554
555 if (line == 0)
556 return (char *)d->spec->data;
557 else
558 return (char *)d->spec->data + d->line_ends[line] + 1;
559 }
560
561 static struct line_log_data *
562 parse_lines(struct commit *commit, const char *prefix, struct string_list *args)
563 {
564 long lines = 0;
565 unsigned long *ends = NULL;
566 struct nth_line_cb cb_data;
567 struct string_list_item *item;
568 struct line_log_data *ranges = NULL;
569
570 for_each_string_list_item(item, args) {
571 const char *name_part, *range_part;
572 char *full_name;
573 struct diff_filespec *spec;
574 long begin = 0, end = 0;
575
576 name_part = skip_range_arg(item->string);
577 if (!name_part || *name_part != ':' || !name_part[1])
578 die("-L argument '%s' not of the form start,end:file",
579 item->string);
580 range_part = xstrndup(item->string, name_part - item->string);
581 name_part++;
582
583 full_name = prefix_path(prefix, prefix ? strlen(prefix) : 0,
584 name_part);
585
586 spec = alloc_filespec(full_name);
587 fill_blob_sha1(commit, spec);
588 fill_line_ends(spec, &lines, &ends);
589 cb_data.spec = spec;
590 cb_data.lines = lines;
591 cb_data.line_ends = ends;
592
593 if (parse_range_arg(range_part, nth_line, &cb_data,
594 lines, &begin, &end,
595 full_name))
596 die("malformed -L argument '%s'", range_part);
597 if (lines < end || ((lines || begin) && lines < begin))
598 die("file %s has only %lu lines", name_part, lines);
599 if (begin < 1)
600 begin = 1;
601 if (end < 1)
602 end = lines;
603 begin--;
604 line_log_data_insert(&ranges, full_name, begin, end);
605
606 free_filespec(spec);
607 free(ends);
608 ends = NULL;
609 }
610
611 return ranges;
612 }
613
614 static struct line_log_data *line_log_data_copy_one(struct line_log_data *r)
615 {
616 struct line_log_data *ret = xmalloc(sizeof(*ret));
617
618 assert(r);
619 line_log_data_init(ret);
620 range_set_copy(&ret->ranges, &r->ranges);
621
622 ret->path = xstrdup(r->path);
623
624 return ret;
625 }
626
627 static struct line_log_data *
628 line_log_data_copy(struct line_log_data *r)
629 {
630 struct line_log_data *ret = NULL;
631 struct line_log_data *tmp = NULL, *prev = NULL;
632
633 assert(r);
634 ret = tmp = prev = line_log_data_copy_one(r);
635 r = r->next;
636 while (r) {
637 tmp = line_log_data_copy_one(r);
638 prev->next = tmp;
639 prev = tmp;
640 r = r->next;
641 }
642
643 return ret;
644 }
645
646 /* merge two range sets across files */
647 static struct line_log_data *line_log_data_merge(struct line_log_data *a,
648 struct line_log_data *b)
649 {
650 struct line_log_data *head = NULL, **pp = &head;
651
652 while (a || b) {
653 struct line_log_data *src;
654 struct line_log_data *src2 = NULL;
655 struct line_log_data *d;
656 int cmp;
657 if (!a)
658 cmp = 1;
659 else if (!b)
660 cmp = -1;
661 else
662 cmp = strcmp(a->path, b->path);
663 if (cmp < 0) {
664 src = a;
665 a = a->next;
666 } else if (cmp == 0) {
667 src = a;
668 a = a->next;
669 src2 = b;
670 b = b->next;
671 } else {
672 src = b;
673 b = b->next;
674 }
675 d = xmalloc(sizeof(struct line_log_data));
676 line_log_data_init(d);
677 d->path = xstrdup(src->path);
678 *pp = d;
679 pp = &d->next;
680 if (src2)
681 range_set_union(&d->ranges, &src->ranges, &src2->ranges);
682 else
683 range_set_copy(&d->ranges, &src->ranges);
684 }
685
686 return head;
687 }
688
689 static void add_line_range(struct rev_info *revs, struct commit *commit,
690 struct line_log_data *range)
691 {
692 struct line_log_data *old = NULL;
693 struct line_log_data *new = NULL;
694
695 old = lookup_decoration(&revs->line_log_data, &commit->object);
696 if (old && range) {
697 new = line_log_data_merge(old, range);
698 free_line_log_data(old);
699 } else if (range)
700 new = line_log_data_copy(range);
701
702 if (new)
703 add_decoration(&revs->line_log_data, &commit->object, new);
704 }
705
706 static void clear_commit_line_range(struct rev_info *revs, struct commit *commit)
707 {
708 struct line_log_data *r;
709 r = lookup_decoration(&revs->line_log_data, &commit->object);
710 if (!r)
711 return;
712 free_line_log_data(r);
713 add_decoration(&revs->line_log_data, &commit->object, NULL);
714 }
715
716 static struct line_log_data *lookup_line_range(struct rev_info *revs,
717 struct commit *commit)
718 {
719 struct line_log_data *ret = NULL;
720 struct line_log_data *d;
721
722 ret = lookup_decoration(&revs->line_log_data, &commit->object);
723
724 for (d = ret; d; d = d->next)
725 range_set_check_invariants(&d->ranges);
726
727 return ret;
728 }
729
730 void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
731 {
732 struct commit *commit = NULL;
733 struct line_log_data *range;
734
735 commit = check_single_commit(rev);
736 range = parse_lines(commit, prefix, args);
737 add_line_range(rev, commit, range);
738
739 if (!rev->diffopt.detect_rename) {
740 int i, count = 0;
741 struct line_log_data *r = range;
742 const char **paths;
743 while (r) {
744 count++;
745 r = r->next;
746 }
747 paths = xmalloc((count+1)*sizeof(char *));
748 r = range;
749 for (i = 0; i < count; i++) {
750 paths[i] = xstrdup(r->path);
751 r = r->next;
752 }
753 paths[count] = NULL;
754 init_pathspec(&rev->diffopt.pathspec, paths);
755 free(paths);
756 }
757 }
758
759 static void load_tree_desc(struct tree_desc *desc, void **tree,
760 const unsigned char *sha1)
761 {
762 unsigned long size;
763 *tree = read_object_with_reference(sha1, tree_type, &size, NULL);
764 if (!*tree)
765 die("Unable to read tree (%s)", sha1_to_hex(sha1));
766 init_tree_desc(desc, *tree, size);
767 }
768
769 static int count_parents(struct commit *commit)
770 {
771 struct commit_list *parents = commit->parents;
772 int count = 0;
773 while (parents) {
774 count++;
775 parents = parents->next;
776 }
777 return count;
778 }
779
780 static void move_diff_queue(struct diff_queue_struct *dst,
781 struct diff_queue_struct *src)
782 {
783 assert(src != dst);
784 memcpy(dst, src, sizeof(struct diff_queue_struct));
785 DIFF_QUEUE_CLEAR(src);
786 }
787
788 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
789 {
790 int i;
791 struct diff_queue_struct outq;
792 DIFF_QUEUE_CLEAR(&outq);
793
794 for (i = 0; i < diff_queued_diff.nr; i++) {
795 struct diff_filepair *p = diff_queued_diff.queue[i];
796 struct line_log_data *rg = NULL;
797
798 if (!DIFF_FILE_VALID(p->two)) {
799 if (keep_deletions)
800 diff_q(&outq, p);
801 else
802 diff_free_filepair(p);
803 continue;
804 }
805 for (rg = range; rg; rg = rg->next) {
806 if (!strcmp(rg->path, p->two->path))
807 break;
808 }
809 if (rg)
810 diff_q(&outq, p);
811 else
812 diff_free_filepair(p);
813 }
814 free(diff_queued_diff.queue);
815 diff_queued_diff = outq;
816 }
817
818 static inline int diff_might_be_rename(void)
819 {
820 int i;
821 for (i = 0; i < diff_queued_diff.nr; i++)
822 if (!DIFF_FILE_VALID(diff_queued_diff.queue[i]->one)) {
823 /* fprintf(stderr, "diff_might_be_rename found creation of: %s\n", */
824 /* diff_queued_diff.queue[i]->two->path); */
825 return 1;
826 }
827 return 0;
828 }
829
830 static void queue_diffs(struct line_log_data *range,
831 struct diff_options *opt,
832 struct diff_queue_struct *queue,
833 struct commit *commit, struct commit *parent)
834 {
835 void *tree1 = NULL, *tree2 = NULL;
836 struct tree_desc desc1, desc2;
837
838 assert(commit);
839 load_tree_desc(&desc2, &tree2, commit->tree->object.sha1);
840 if (parent)
841 load_tree_desc(&desc1, &tree1, parent->tree->object.sha1);
842 else
843 init_tree_desc(&desc1, "", 0);
844
845 DIFF_QUEUE_CLEAR(&diff_queued_diff);
846 diff_tree(&desc1, &desc2, "", opt);
847 if (opt->detect_rename) {
848 filter_diffs_for_paths(range, 1);
849 if (diff_might_be_rename())
850 diffcore_std(opt);
851 filter_diffs_for_paths(range, 0);
852 }
853 move_diff_queue(queue, &diff_queued_diff);
854
855 if (tree1)
856 free(tree1);
857 if (tree2)
858 free(tree2);
859 }
860
861 static char *get_nth_line(long line, unsigned long *ends, void *data)
862 {
863 if (line == 0)
864 return (char *)data;
865 else
866 return (char *)data + ends[line] + 1;
867 }
868
869 static void print_line(const char *prefix, char first,
870 long line, unsigned long *ends, void *data,
871 const char *color, const char *reset)
872 {
873 char *begin = get_nth_line(line, ends, data);
874 char *end = get_nth_line(line+1, ends, data);
875 int had_nl = 0;
876
877 if (end > begin && end[-1] == '\n') {
878 end--;
879 had_nl = 1;
880 }
881
882 fputs(prefix, stdout);
883 fputs(color, stdout);
884 putchar(first);
885 fwrite(begin, 1, end-begin, stdout);
886 fputs(reset, stdout);
887 putchar('\n');
888 if (!had_nl)
889 fputs("\\ No newline at end of file\n", stdout);
890 }
891
892 static char *output_prefix(struct diff_options *opt)
893 {
894 char *prefix = "";
895
896 if (opt->output_prefix) {
897 struct strbuf *sb = opt->output_prefix(opt, opt->output_prefix_data);
898 prefix = sb->buf;
899 }
900
901 return prefix;
902 }
903
904 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
905 {
906 int i, j = 0;
907 long p_lines, t_lines;
908 unsigned long *p_ends = NULL, *t_ends = NULL;
909 struct diff_filepair *pair = range->pair;
910 struct diff_ranges *diff = &range->diff;
911
912 struct diff_options *opt = &rev->diffopt;
913 char *prefix = output_prefix(opt);
914 const char *c_reset = diff_get_color(opt->use_color, DIFF_RESET);
915 const char *c_frag = diff_get_color(opt->use_color, DIFF_FRAGINFO);
916 const char *c_meta = diff_get_color(opt->use_color, DIFF_METAINFO);
917 const char *c_old = diff_get_color(opt->use_color, DIFF_FILE_OLD);
918 const char *c_new = diff_get_color(opt->use_color, DIFF_FILE_NEW);
919 const char *c_plain = diff_get_color(opt->use_color, DIFF_PLAIN);
920
921 if (!pair || !diff)
922 return;
923
924 if (pair->one->sha1_valid)
925 fill_line_ends(pair->one, &p_lines, &p_ends);
926 fill_line_ends(pair->two, &t_lines, &t_ends);
927
928 printf("%s%sdiff --git a/%s b/%s%s\n", prefix, c_meta, pair->one->path, pair->two->path, c_reset);
929 printf("%s%s--- %s%s%s\n", prefix, c_meta,
930 pair->one->sha1_valid ? "a/" : "",
931 pair->one->sha1_valid ? pair->one->path : "/dev/null",
932 c_reset);
933 printf("%s%s+++ b/%s%s\n", prefix, c_meta, pair->two->path, c_reset);
934 for (i = 0; i < range->ranges.nr; i++) {
935 long p_start, p_end;
936 long t_start = range->ranges.ranges[i].start;
937 long t_end = range->ranges.ranges[i].end;
938 long t_cur = t_start;
939 int j_last;
940
941 while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
942 j++;
943 if (j == diff->target.nr || diff->target.ranges[j].start > t_end)
944 continue;
945
946 /* Scan ahead to determine the last diff that falls in this range */
947 j_last = j;
948 while (j_last < diff->target.nr && diff->target.ranges[j_last].start < t_end)
949 j_last++;
950 if (j_last > j)
951 j_last--;
952
953 /*
954 * Compute parent hunk headers: we know that the diff
955 * has the correct line numbers (but not all hunks).
956 * So it suffices to shift the start/end according to
957 * the line numbers of the first/last hunk(s) that
958 * fall in this range.
959 */
960 if (t_start < diff->target.ranges[j].start)
961 p_start = diff->parent.ranges[j].start - (diff->target.ranges[j].start-t_start);
962 else
963 p_start = diff->parent.ranges[j].start;
964 if (t_end > diff->target.ranges[j_last].end)
965 p_end = diff->parent.ranges[j_last].end + (t_end-diff->target.ranges[j_last].end);
966 else
967 p_end = diff->parent.ranges[j_last].end;
968
969 if (!p_start && !p_end) {
970 p_start = -1;
971 p_end = -1;
972 }
973
974 /* Now output a diff hunk for this range */
975 printf("%s%s@@ -%ld,%ld +%ld,%ld @@%s\n",
976 prefix, c_frag,
977 p_start+1, p_end-p_start, t_start+1, t_end-t_start,
978 c_reset);
979 while (j < diff->target.nr && diff->target.ranges[j].start < t_end) {
980 int k;
981 for (; t_cur < diff->target.ranges[j].start; t_cur++)
982 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
983 c_plain, c_reset);
984 for (k = diff->parent.ranges[j].start; k < diff->parent.ranges[j].end; k++)
985 print_line(prefix, '-', k, p_ends, pair->one->data,
986 c_old, c_reset);
987 for (; t_cur < diff->target.ranges[j].end && t_cur < t_end; t_cur++)
988 print_line(prefix, '+', t_cur, t_ends, pair->two->data,
989 c_new, c_reset);
990 j++;
991 }
992 for (; t_cur < t_end; t_cur++)
993 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
994 c_plain, c_reset);
995 }
996
997 free(p_ends);
998 free(t_ends);
999 }
1000
1001 /*
1002 * NEEDSWORK: manually building a diff here is not the Right
1003 * Thing(tm). log -L should be built into the diff pipeline.
1004 */
1005 static void dump_diff_hacky(struct rev_info *rev, struct line_log_data *range)
1006 {
1007 puts(output_prefix(&rev->diffopt));
1008 while (range) {
1009 dump_diff_hacky_one(rev, range);
1010 range = range->next;
1011 }
1012 }
1013
1014 /*
1015 * Unlike most other functions, this destructively operates on
1016 * 'range'.
1017 */
1018 static int process_diff_filepair(struct rev_info *rev,
1019 struct diff_filepair *pair,
1020 struct line_log_data *range,
1021 struct diff_ranges **diff_out)
1022 {
1023 struct line_log_data *rg = range;
1024 struct range_set tmp;
1025 struct diff_ranges diff;
1026 mmfile_t file_parent, file_target;
1027
1028 assert(pair->two->path);
1029 while (rg) {
1030 assert(rg->path);
1031 if (!strcmp(rg->path, pair->two->path))
1032 break;
1033 rg = rg->next;
1034 }
1035
1036 if (!rg)
1037 return 0;
1038 if (rg->ranges.nr == 0)
1039 return 0;
1040
1041 assert(pair->two->sha1_valid);
1042 diff_populate_filespec(pair->two, 0);
1043 file_target.ptr = pair->two->data;
1044 file_target.size = pair->two->size;
1045
1046 if (pair->one->sha1_valid) {
1047 diff_populate_filespec(pair->one, 0);
1048 file_parent.ptr = pair->one->data;
1049 file_parent.size = pair->one->size;
1050 } else {
1051 file_parent.ptr = "";
1052 file_parent.size = 0;
1053 }
1054
1055 diff_ranges_init(&diff);
1056 collect_diff(&file_parent, &file_target, &diff);
1057
1058 /* NEEDSWORK should apply some heuristics to prevent mismatches */
1059 free(rg->path);
1060 rg->path = xstrdup(pair->one->path);
1061
1062 range_set_init(&tmp, 0);
1063 range_set_map_across_diff(&tmp, &rg->ranges, &diff, diff_out);
1064 range_set_release(&rg->ranges);
1065 range_set_move(&rg->ranges, &tmp);
1066
1067 diff_ranges_release(&diff);
1068
1069 return ((*diff_out)->parent.nr > 0);
1070 }
1071
1072 static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
1073 {
1074 struct diff_filepair *new = xmalloc(sizeof(struct diff_filepair));
1075 new->one = pair->one;
1076 new->two = pair->two;
1077 new->one->count++;
1078 new->two->count++;
1079 return new;
1080 }
1081
1082 static void free_diffqueues(int n, struct diff_queue_struct *dq)
1083 {
1084 int i, j;
1085 for (i = 0; i < n; i++)
1086 for (j = 0; j < dq[i].nr; j++)
1087 diff_free_filepair(dq[i].queue[j]);
1088 free(dq);
1089 }
1090
1091 static int process_all_files(struct line_log_data **range_out,
1092 struct rev_info *rev,
1093 struct diff_queue_struct *queue,
1094 struct line_log_data *range)
1095 {
1096 int i, changed = 0;
1097
1098 *range_out = line_log_data_copy(range);
1099
1100 for (i = 0; i < queue->nr; i++) {
1101 struct diff_ranges *pairdiff = NULL;
1102 struct diff_filepair *pair = queue->queue[i];
1103 if (process_diff_filepair(rev, pair, *range_out, &pairdiff)) {
1104 /*
1105 * Store away the diff for later output. We
1106 * tuck it in the ranges we got as _input_,
1107 * since that's the commit that caused the
1108 * diff.
1109 *
1110 * NEEDSWORK not enough when we get around to
1111 * doing something interesting with merges;
1112 * currently each invocation on a merge parent
1113 * trashes the previous one's diff.
1114 *
1115 * NEEDSWORK tramples over data structures not owned here
1116 */
1117 struct line_log_data *rg = range;
1118 changed++;
1119 while (rg && strcmp(rg->path, pair->two->path))
1120 rg = rg->next;
1121 assert(rg);
1122 rg->pair = diff_filepair_dup(queue->queue[i]);
1123 memcpy(&rg->diff, pairdiff, sizeof(struct diff_ranges));
1124 }
1125 }
1126
1127 return changed;
1128 }
1129
1130 int line_log_print(struct rev_info *rev, struct commit *commit)
1131 {
1132 struct line_log_data *range = lookup_line_range(rev, commit);
1133
1134 show_log(rev);
1135 dump_diff_hacky(rev, range);
1136 return 1;
1137 }
1138
1139 static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *commit,
1140 struct line_log_data *range)
1141 {
1142 struct commit *parent = NULL;
1143 struct diff_queue_struct queue;
1144 struct line_log_data *parent_range;
1145 int changed;
1146
1147 if (commit->parents)
1148 parent = commit->parents->item;
1149
1150 queue_diffs(range, &rev->diffopt, &queue, commit, parent);
1151 changed = process_all_files(&parent_range, rev, &queue, range);
1152 if (parent)
1153 add_line_range(rev, parent, parent_range);
1154 return changed;
1155 }
1156
1157 static int process_ranges_merge_commit(struct rev_info *rev, struct commit *commit,
1158 struct line_log_data *range)
1159 {
1160 struct diff_queue_struct *diffqueues;
1161 struct line_log_data **cand;
1162 struct commit **parents;
1163 struct commit_list *p;
1164 int i;
1165 int nparents = count_parents(commit);
1166
1167 diffqueues = xmalloc(nparents * sizeof(*diffqueues));
1168 cand = xmalloc(nparents * sizeof(*cand));
1169 parents = xmalloc(nparents * sizeof(*parents));
1170
1171 p = commit->parents;
1172 for (i = 0; i < nparents; i++) {
1173 parents[i] = p->item;
1174 p = p->next;
1175 queue_diffs(range, &rev->diffopt, &diffqueues[i], commit, parents[i]);
1176 }
1177
1178 for (i = 0; i < nparents; i++) {
1179 int changed;
1180 cand[i] = NULL;
1181 changed = process_all_files(&cand[i], rev, &diffqueues[i], range);
1182 if (!changed) {
1183 /*
1184 * This parent can take all the blame, so we
1185 * don't follow any other path in history
1186 */
1187 add_line_range(rev, parents[i], cand[i]);
1188 clear_commit_line_range(rev, commit);
1189 commit->parents = xmalloc(sizeof(struct commit_list));
1190 commit->parents->item = parents[i];
1191 commit->parents->next = NULL;
1192 free(parents);
1193 free(cand);
1194 free_diffqueues(nparents, diffqueues);
1195 /* NEEDSWORK leaking like a sieve */
1196 return 0;
1197 }
1198 }
1199
1200 /*
1201 * No single parent took the blame. We add the candidates
1202 * from the above loop to the parents.
1203 */
1204 for (i = 0; i < nparents; i++) {
1205 add_line_range(rev, parents[i], cand[i]);
1206 }
1207
1208 clear_commit_line_range(rev, commit);
1209 free(parents);
1210 free(cand);
1211 free_diffqueues(nparents, diffqueues);
1212 return 1;
1213
1214 /* NEEDSWORK evil merge detection stuff */
1215 /* NEEDSWORK leaking like a sieve */
1216 }
1217
1218 static int process_ranges_arbitrary_commit(struct rev_info *rev, struct commit *commit)
1219 {
1220 struct line_log_data *range = lookup_line_range(rev, commit);
1221 int changed = 0;
1222
1223 if (range) {
1224 if (!commit->parents || !commit->parents->next)
1225 changed = process_ranges_ordinary_commit(rev, commit, range);
1226 else
1227 changed = process_ranges_merge_commit(rev, commit, range);
1228 }
1229
1230 if (!changed)
1231 commit->object.flags |= TREESAME;
1232
1233 return changed;
1234 }
1235
1236 static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
1237 {
1238 for (;;) {
1239 struct commit *p = *pp;
1240 if (p->parents && p->parents->next)
1241 return rewrite_one_ok;
1242 if (p->object.flags & UNINTERESTING)
1243 return rewrite_one_ok;
1244 if (!(p->object.flags & TREESAME))
1245 return rewrite_one_ok;
1246 if (!p->parents)
1247 return rewrite_one_noparents;
1248 *pp = p->parents->item;
1249 }
1250 }
1251
1252 int line_log_filter(struct rev_info *rev)
1253 {
1254 struct commit *commit;
1255 struct commit_list *list = rev->commits;
1256 struct commit_list *out = NULL, **pp = &out;
1257
1258 while (list) {
1259 struct commit_list *to_free = NULL;
1260 commit = list->item;
1261 if (process_ranges_arbitrary_commit(rev, commit)) {
1262 *pp = list;
1263 pp = &list->next;
1264 } else
1265 to_free = list;
1266 list = list->next;
1267 free(to_free);
1268 }
1269 *pp = NULL;
1270
1271 for (list = out; list; list = list->next)
1272 rewrite_parents(rev, list->item, line_log_rewrite_one);
1273
1274 rev->commits = out;
1275
1276 return 0;
1277 }
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