Merge branch 'cb/do-not-use-test-cmp-with-a'
[git/git.git] / line-log.c
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 #include "argv-array.h"
18
19 static void range_set_grow(struct range_set *rs, size_t extra)
20 {
21 ALLOC_GROW(rs->ranges, rs->nr + extra, rs->alloc);
22 }
23
24 /* Either initialization would be fine */
25 #define RANGE_SET_INIT {0}
26
27 void range_set_init(struct range_set *rs, size_t prealloc)
28 {
29 rs->alloc = rs->nr = 0;
30 rs->ranges = NULL;
31 if (prealloc)
32 range_set_grow(rs, prealloc);
33 }
34
35 void range_set_release(struct range_set *rs)
36 {
37 FREE_AND_NULL(rs->ranges);
38 rs->alloc = rs->nr = 0;
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 COPY_ARRAY(dst->ranges, src->ranges, src->nr);
46 dst->nr = src->nr;
47 }
48
49 static void range_set_move(struct range_set *dst, struct range_set *src)
50 {
51 range_set_release(dst);
52 dst->ranges = src->ranges;
53 dst->nr = src->nr;
54 dst->alloc = src->alloc;
55 src->ranges = NULL;
56 src->alloc = src->nr = 0;
57 }
58
59 /* tack on a _new_ range _at the end_ */
60 void range_set_append_unsafe(struct range_set *rs, long a, long b)
61 {
62 assert(a <= b);
63 range_set_grow(rs, 1);
64 rs->ranges[rs->nr].start = a;
65 rs->ranges[rs->nr].end = b;
66 rs->nr++;
67 }
68
69 void range_set_append(struct range_set *rs, long a, long b)
70 {
71 assert(rs->nr == 0 || rs->ranges[rs->nr-1].end <= a);
72 range_set_append_unsafe(rs, a, b);
73 }
74
75 static int range_cmp(const void *_r, const void *_s)
76 {
77 const struct range *r = _r;
78 const struct range *s = _s;
79
80 /* this could be simply 'return r.start-s.start', but for the types */
81 if (r->start == s->start)
82 return 0;
83 if (r->start < s->start)
84 return -1;
85 return 1;
86 }
87
88 /*
89 * Check that the ranges are non-empty, sorted and non-overlapping
90 */
91 static void range_set_check_invariants(struct range_set *rs)
92 {
93 unsigned int i;
94
95 if (!rs)
96 return;
97
98 if (rs->nr)
99 assert(rs->ranges[0].start < rs->ranges[0].end);
100
101 for (i = 1; i < rs->nr; i++) {
102 assert(rs->ranges[i-1].end < rs->ranges[i].start);
103 assert(rs->ranges[i].start < rs->ranges[i].end);
104 }
105 }
106
107 /*
108 * In-place pass of sorting and merging the ranges in the range set,
109 * to establish the invariants when we get the ranges from the user
110 */
111 void sort_and_merge_range_set(struct range_set *rs)
112 {
113 unsigned int i;
114 unsigned int o = 0; /* output cursor */
115
116 QSORT(rs->ranges, rs->nr, range_cmp);
117
118 for (i = 0; i < rs->nr; i++) {
119 if (rs->ranges[i].start == rs->ranges[i].end)
120 continue;
121 if (o > 0 && rs->ranges[i].start <= rs->ranges[o-1].end) {
122 if (rs->ranges[o-1].end < rs->ranges[i].end)
123 rs->ranges[o-1].end = rs->ranges[i].end;
124 } else {
125 rs->ranges[o].start = rs->ranges[i].start;
126 rs->ranges[o].end = rs->ranges[i].end;
127 o++;
128 }
129 }
130 assert(o <= rs->nr);
131 rs->nr = o;
132
133 range_set_check_invariants(rs);
134 }
135
136 /*
137 * Union of range sets (i.e., sets of line numbers). Used to merge
138 * them when searches meet at a common ancestor.
139 *
140 * This is also where the ranges are consolidated into canonical form:
141 * overlapping and adjacent ranges are merged, and empty ranges are
142 * removed.
143 */
144 static void range_set_union(struct range_set *out,
145 struct range_set *a, struct range_set *b)
146 {
147 unsigned int i = 0, j = 0;
148 struct range *ra = a->ranges;
149 struct range *rb = b->ranges;
150 /* cannot make an alias of out->ranges: it may change during grow */
151
152 assert(out->nr == 0);
153 while (i < a->nr || j < b->nr) {
154 struct range *new_range;
155 if (i < a->nr && j < b->nr) {
156 if (ra[i].start < rb[j].start)
157 new_range = &ra[i++];
158 else if (ra[i].start > rb[j].start)
159 new_range = &rb[j++];
160 else if (ra[i].end < rb[j].end)
161 new_range = &ra[i++];
162 else
163 new_range = &rb[j++];
164 } else if (i < a->nr) /* b exhausted */
165 new_range = &ra[i++];
166 else /* a exhausted */
167 new_range = &rb[j++];
168 if (new_range->start == new_range->end)
169 ; /* empty range */
170 else if (!out->nr || out->ranges[out->nr-1].end < new_range->start) {
171 range_set_grow(out, 1);
172 out->ranges[out->nr].start = new_range->start;
173 out->ranges[out->nr].end = new_range->end;
174 out->nr++;
175 } else if (out->ranges[out->nr-1].end < new_range->end) {
176 out->ranges[out->nr-1].end = new_range->end;
177 }
178 }
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 unsigned 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 static 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 free(path);
295 return;
296 }
297
298 p = xcalloc(1, sizeof(struct line_log_data));
299 p->path = path;
300 range_set_append(&p->ranges, begin, end);
301 if (ip) {
302 p->next = ip->next;
303 ip->next = p;
304 } else {
305 p->next = *list;
306 *list = p;
307 }
308 }
309
310 struct collect_diff_cbdata {
311 struct diff_ranges *diff;
312 };
313
314 static int collect_diff_cb(long start_a, long count_a,
315 long start_b, long count_b,
316 void *data)
317 {
318 struct collect_diff_cbdata *d = data;
319
320 if (count_a >= 0)
321 range_set_append(&d->diff->parent, start_a, start_a + count_a);
322 if (count_b >= 0)
323 range_set_append(&d->diff->target, start_b, start_b + count_b);
324
325 return 0;
326 }
327
328 static int collect_diff(mmfile_t *parent, mmfile_t *target, struct diff_ranges *out)
329 {
330 struct collect_diff_cbdata cbdata = {NULL};
331 xpparam_t xpp;
332 xdemitconf_t xecfg;
333 xdemitcb_t ecb;
334
335 memset(&xpp, 0, sizeof(xpp));
336 memset(&xecfg, 0, sizeof(xecfg));
337 xecfg.ctxlen = xecfg.interhunkctxlen = 0;
338
339 cbdata.diff = out;
340 xecfg.hunk_func = collect_diff_cb;
341 memset(&ecb, 0, sizeof(ecb));
342 ecb.priv = &cbdata;
343 return xdi_diff(parent, target, &xpp, &xecfg, &ecb);
344 }
345
346 /*
347 * These are handy for debugging. Removing them with #if 0 silences
348 * the "unused function" warning.
349 */
350 #if 0
351 static void dump_range_set(struct range_set *rs, const char *desc)
352 {
353 int i;
354 printf("range set %s (%d items):\n", desc, rs->nr);
355 for (i = 0; i < rs->nr; i++)
356 printf("\t[%ld,%ld]\n", rs->ranges[i].start, rs->ranges[i].end);
357 }
358
359 static void dump_line_log_data(struct line_log_data *r)
360 {
361 char buf[4096];
362 while (r) {
363 snprintf(buf, 4096, "file %s\n", r->path);
364 dump_range_set(&r->ranges, buf);
365 r = r->next;
366 }
367 }
368
369 static void dump_diff_ranges(struct diff_ranges *diff, const char *desc)
370 {
371 int i;
372 assert(diff->parent.nr == diff->target.nr);
373 printf("diff ranges %s (%d items):\n", desc, diff->parent.nr);
374 printf("\tparent\ttarget\n");
375 for (i = 0; i < diff->parent.nr; i++) {
376 printf("\t[%ld,%ld]\t[%ld,%ld]\n",
377 diff->parent.ranges[i].start,
378 diff->parent.ranges[i].end,
379 diff->target.ranges[i].start,
380 diff->target.ranges[i].end);
381 }
382 }
383 #endif
384
385
386 static int ranges_overlap(struct range *a, struct range *b)
387 {
388 return !(a->end <= b->start || b->end <= a->start);
389 }
390
391 /*
392 * Given a diff and the set of interesting ranges, determine all hunks
393 * of the diff which touch (overlap) at least one of the interesting
394 * ranges in the target.
395 */
396 static void diff_ranges_filter_touched(struct diff_ranges *out,
397 struct diff_ranges *diff,
398 struct range_set *rs)
399 {
400 unsigned int i, j = 0;
401
402 assert(out->target.nr == 0);
403
404 for (i = 0; i < diff->target.nr; i++) {
405 while (diff->target.ranges[i].start > rs->ranges[j].end) {
406 j++;
407 if (j == rs->nr)
408 return;
409 }
410 if (ranges_overlap(&diff->target.ranges[i], &rs->ranges[j])) {
411 range_set_append(&out->parent,
412 diff->parent.ranges[i].start,
413 diff->parent.ranges[i].end);
414 range_set_append(&out->target,
415 diff->target.ranges[i].start,
416 diff->target.ranges[i].end);
417 }
418 }
419 }
420
421 /*
422 * Adjust the line counts in 'rs' to account for the lines
423 * added/removed in the diff.
424 */
425 static void range_set_shift_diff(struct range_set *out,
426 struct range_set *rs,
427 struct diff_ranges *diff)
428 {
429 unsigned int i, j = 0;
430 long offset = 0;
431 struct range *src = rs->ranges;
432 struct range *target = diff->target.ranges;
433 struct range *parent = diff->parent.ranges;
434
435 for (i = 0; i < rs->nr; i++) {
436 while (j < diff->target.nr && src[i].start >= target[j].start) {
437 offset += (parent[j].end-parent[j].start)
438 - (target[j].end-target[j].start);
439 j++;
440 }
441 range_set_append(out, src[i].start+offset, src[i].end+offset);
442 }
443 }
444
445 /*
446 * Given a diff and the set of interesting ranges, map the ranges
447 * across the diff. That is: observe that the target commit takes
448 * blame for all the + (target-side) ranges. So for every pair of
449 * ranges in the diff that was touched, we remove the latter and add
450 * its parent side.
451 */
452 static void range_set_map_across_diff(struct range_set *out,
453 struct range_set *rs,
454 struct diff_ranges *diff,
455 struct diff_ranges **touched_out)
456 {
457 struct diff_ranges *touched = xmalloc(sizeof(*touched));
458 struct range_set tmp1 = RANGE_SET_INIT;
459 struct range_set tmp2 = RANGE_SET_INIT;
460
461 diff_ranges_init(touched);
462 diff_ranges_filter_touched(touched, diff, rs);
463 range_set_difference(&tmp1, rs, &touched->target);
464 range_set_shift_diff(&tmp2, &tmp1, diff);
465 range_set_union(out, &tmp2, &touched->parent);
466 range_set_release(&tmp1);
467 range_set_release(&tmp2);
468
469 *touched_out = touched;
470 }
471
472 static struct commit *check_single_commit(struct rev_info *revs)
473 {
474 struct object *commit = NULL;
475 int found = -1;
476 int i;
477
478 for (i = 0; i < revs->pending.nr; i++) {
479 struct object *obj = revs->pending.objects[i].item;
480 if (obj->flags & UNINTERESTING)
481 continue;
482 obj = deref_tag(revs->repo, obj, NULL, 0);
483 if (obj->type != OBJ_COMMIT)
484 die("Non commit %s?", revs->pending.objects[i].name);
485 if (commit)
486 die("More than one commit to dig from: %s and %s?",
487 revs->pending.objects[i].name,
488 revs->pending.objects[found].name);
489 commit = obj;
490 found = i;
491 }
492
493 if (!commit)
494 die("No commit specified?");
495
496 return (struct commit *) commit;
497 }
498
499 static void fill_blob_sha1(struct repository *r, struct commit *commit,
500 struct diff_filespec *spec)
501 {
502 unsigned short mode;
503 struct object_id oid;
504
505 if (get_tree_entry(r, &commit->object.oid, spec->path, &oid, &mode))
506 die("There is no path %s in the commit", spec->path);
507 fill_filespec(spec, &oid, 1, mode);
508
509 return;
510 }
511
512 static void fill_line_ends(struct repository *r,
513 struct diff_filespec *spec,
514 long *lines,
515 unsigned long **line_ends)
516 {
517 int num = 0, size = 50;
518 long cur = 0;
519 unsigned long *ends = NULL;
520 char *data = NULL;
521
522 if (diff_populate_filespec(r, spec, 0))
523 die("Cannot read blob %s", oid_to_hex(&spec->oid));
524
525 ALLOC_ARRAY(ends, size);
526 ends[cur++] = 0;
527 data = spec->data;
528 while (num < spec->size) {
529 if (data[num] == '\n' || num == spec->size - 1) {
530 ALLOC_GROW(ends, (cur + 1), size);
531 ends[cur++] = num;
532 }
533 num++;
534 }
535
536 /* shrink the array to fit the elements */
537 REALLOC_ARRAY(ends, cur);
538 *lines = cur-1;
539 *line_ends = ends;
540 }
541
542 struct nth_line_cb {
543 struct diff_filespec *spec;
544 long lines;
545 unsigned long *line_ends;
546 };
547
548 static const char *nth_line(void *data, long line)
549 {
550 struct nth_line_cb *d = data;
551 assert(d && line <= d->lines);
552 assert(d->spec && d->spec->data);
553
554 if (line == 0)
555 return (char *)d->spec->data;
556 else
557 return (char *)d->spec->data + d->line_ends[line] + 1;
558 }
559
560 static struct line_log_data *
561 parse_lines(struct repository *r, struct commit *commit,
562 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 struct line_log_data *p;
570
571 for_each_string_list_item(item, args) {
572 const char *name_part, *range_part;
573 char *full_name;
574 struct diff_filespec *spec;
575 long begin = 0, end = 0;
576 long anchor;
577
578 name_part = skip_range_arg(item->string, r->index);
579 if (!name_part || *name_part != ':' || !name_part[1])
580 die("-L argument not 'start,end:file' or ':funcname:file': %s",
581 item->string);
582 range_part = xstrndup(item->string, name_part - item->string);
583 name_part++;
584
585 full_name = prefix_path(prefix, prefix ? strlen(prefix) : 0,
586 name_part);
587
588 spec = alloc_filespec(full_name);
589 fill_blob_sha1(r, commit, spec);
590 fill_line_ends(r, spec, &lines, &ends);
591 cb_data.spec = spec;
592 cb_data.lines = lines;
593 cb_data.line_ends = ends;
594
595 p = search_line_log_data(ranges, full_name, NULL);
596 if (p && p->ranges.nr)
597 anchor = p->ranges.ranges[p->ranges.nr - 1].end + 1;
598 else
599 anchor = 1;
600
601 if (parse_range_arg(range_part, nth_line, &cb_data,
602 lines, anchor, &begin, &end,
603 full_name, r->index))
604 die("malformed -L argument '%s'", range_part);
605 if ((!lines && (begin || end)) || lines < begin)
606 die("file %s has only %lu lines", name_part, lines);
607 if (begin < 1)
608 begin = 1;
609 if (end < 1 || lines < end)
610 end = lines;
611 begin--;
612 line_log_data_insert(&ranges, full_name, begin, end);
613
614 free_filespec(spec);
615 FREE_AND_NULL(ends);
616 }
617
618 for (p = ranges; p; p = p->next)
619 sort_and_merge_range_set(&p->ranges);
620
621 return ranges;
622 }
623
624 static struct line_log_data *line_log_data_copy_one(struct line_log_data *r)
625 {
626 struct line_log_data *ret = xmalloc(sizeof(*ret));
627
628 assert(r);
629 line_log_data_init(ret);
630 range_set_copy(&ret->ranges, &r->ranges);
631
632 ret->path = xstrdup(r->path);
633
634 return ret;
635 }
636
637 static struct line_log_data *
638 line_log_data_copy(struct line_log_data *r)
639 {
640 struct line_log_data *ret = NULL;
641 struct line_log_data *tmp = NULL, *prev = NULL;
642
643 assert(r);
644 ret = tmp = prev = line_log_data_copy_one(r);
645 r = r->next;
646 while (r) {
647 tmp = line_log_data_copy_one(r);
648 prev->next = tmp;
649 prev = tmp;
650 r = r->next;
651 }
652
653 return ret;
654 }
655
656 /* merge two range sets across files */
657 static struct line_log_data *line_log_data_merge(struct line_log_data *a,
658 struct line_log_data *b)
659 {
660 struct line_log_data *head = NULL, **pp = &head;
661
662 while (a || b) {
663 struct line_log_data *src;
664 struct line_log_data *src2 = NULL;
665 struct line_log_data *d;
666 int cmp;
667 if (!a)
668 cmp = 1;
669 else if (!b)
670 cmp = -1;
671 else
672 cmp = strcmp(a->path, b->path);
673 if (cmp < 0) {
674 src = a;
675 a = a->next;
676 } else if (cmp == 0) {
677 src = a;
678 a = a->next;
679 src2 = b;
680 b = b->next;
681 } else {
682 src = b;
683 b = b->next;
684 }
685 d = xmalloc(sizeof(struct line_log_data));
686 line_log_data_init(d);
687 d->path = xstrdup(src->path);
688 *pp = d;
689 pp = &d->next;
690 if (src2)
691 range_set_union(&d->ranges, &src->ranges, &src2->ranges);
692 else
693 range_set_copy(&d->ranges, &src->ranges);
694 }
695
696 return head;
697 }
698
699 static void add_line_range(struct rev_info *revs, struct commit *commit,
700 struct line_log_data *range)
701 {
702 struct line_log_data *old_line = NULL;
703 struct line_log_data *new_line = NULL;
704
705 old_line = lookup_decoration(&revs->line_log_data, &commit->object);
706 if (old_line && range) {
707 new_line = line_log_data_merge(old_line, range);
708 free_line_log_data(old_line);
709 } else if (range)
710 new_line = line_log_data_copy(range);
711
712 if (new_line)
713 add_decoration(&revs->line_log_data, &commit->object, new_line);
714 }
715
716 static void clear_commit_line_range(struct rev_info *revs, struct commit *commit)
717 {
718 struct line_log_data *r;
719 r = lookup_decoration(&revs->line_log_data, &commit->object);
720 if (!r)
721 return;
722 free_line_log_data(r);
723 add_decoration(&revs->line_log_data, &commit->object, NULL);
724 }
725
726 static struct line_log_data *lookup_line_range(struct rev_info *revs,
727 struct commit *commit)
728 {
729 struct line_log_data *ret = NULL;
730 struct line_log_data *d;
731
732 ret = lookup_decoration(&revs->line_log_data, &commit->object);
733
734 for (d = ret; d; d = d->next)
735 range_set_check_invariants(&d->ranges);
736
737 return ret;
738 }
739
740 static int same_paths_in_pathspec_and_range(struct pathspec *pathspec,
741 struct line_log_data *range)
742 {
743 int i;
744 struct line_log_data *r;
745
746 for (i = 0, r = range; i < pathspec->nr && r; i++, r = r->next)
747 if (strcmp(pathspec->items[i].match, r->path))
748 return 0;
749 if (i < pathspec->nr || r)
750 /* different number of pathspec items and ranges */
751 return 0;
752
753 return 1;
754 }
755
756 static void parse_pathspec_from_ranges(struct pathspec *pathspec,
757 struct line_log_data *range)
758 {
759 struct line_log_data *r;
760 struct argv_array array = ARGV_ARRAY_INIT;
761 const char **paths;
762
763 for (r = range; r; r = r->next)
764 argv_array_push(&array, r->path);
765 paths = argv_array_detach(&array);
766
767 parse_pathspec(pathspec, 0, PATHSPEC_PREFER_FULL, "", paths);
768 /* strings are now owned by pathspec */
769 free(paths);
770 }
771
772 void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
773 {
774 struct commit *commit = NULL;
775 struct line_log_data *range;
776
777 commit = check_single_commit(rev);
778 range = parse_lines(rev->diffopt.repo, commit, prefix, args);
779 add_line_range(rev, commit, range);
780
781 parse_pathspec_from_ranges(&rev->diffopt.pathspec, range);
782 }
783
784 static void move_diff_queue(struct diff_queue_struct *dst,
785 struct diff_queue_struct *src)
786 {
787 assert(src != dst);
788 memcpy(dst, src, sizeof(struct diff_queue_struct));
789 DIFF_QUEUE_CLEAR(src);
790 }
791
792 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
793 {
794 int i;
795 struct diff_queue_struct outq;
796 DIFF_QUEUE_CLEAR(&outq);
797
798 for (i = 0; i < diff_queued_diff.nr; i++) {
799 struct diff_filepair *p = diff_queued_diff.queue[i];
800 struct line_log_data *rg = NULL;
801
802 if (!DIFF_FILE_VALID(p->two)) {
803 if (keep_deletions)
804 diff_q(&outq, p);
805 else
806 diff_free_filepair(p);
807 continue;
808 }
809 for (rg = range; rg; rg = rg->next) {
810 if (!strcmp(rg->path, p->two->path))
811 break;
812 }
813 if (rg)
814 diff_q(&outq, p);
815 else
816 diff_free_filepair(p);
817 }
818 free(diff_queued_diff.queue);
819 diff_queued_diff = outq;
820 }
821
822 static inline int diff_might_be_rename(void)
823 {
824 int i;
825 for (i = 0; i < diff_queued_diff.nr; i++)
826 if (!DIFF_FILE_VALID(diff_queued_diff.queue[i]->one)) {
827 /* fprintf(stderr, "diff_might_be_rename found creation of: %s\n", */
828 /* diff_queued_diff.queue[i]->two->path); */
829 return 1;
830 }
831 return 0;
832 }
833
834 static void queue_diffs(struct line_log_data *range,
835 struct diff_options *opt,
836 struct diff_queue_struct *queue,
837 struct commit *commit, struct commit *parent)
838 {
839 struct object_id *tree_oid, *parent_tree_oid;
840
841 assert(commit);
842
843 tree_oid = get_commit_tree_oid(commit);
844 parent_tree_oid = parent ? get_commit_tree_oid(parent) : NULL;
845
846 if (opt->detect_rename &&
847 !same_paths_in_pathspec_and_range(&opt->pathspec, range)) {
848 clear_pathspec(&opt->pathspec);
849 parse_pathspec_from_ranges(&opt->pathspec, range);
850 }
851 DIFF_QUEUE_CLEAR(&diff_queued_diff);
852 diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
853 if (opt->detect_rename && diff_might_be_rename()) {
854 /* must look at the full tree diff to detect renames */
855 clear_pathspec(&opt->pathspec);
856 DIFF_QUEUE_CLEAR(&diff_queued_diff);
857
858 diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
859
860 filter_diffs_for_paths(range, 1);
861 diffcore_std(opt);
862 filter_diffs_for_paths(range, 0);
863 }
864 move_diff_queue(queue, &diff_queued_diff);
865 }
866
867 static char *get_nth_line(long line, unsigned long *ends, void *data)
868 {
869 if (line == 0)
870 return (char *)data;
871 else
872 return (char *)data + ends[line] + 1;
873 }
874
875 static void print_line(const char *prefix, char first,
876 long line, unsigned long *ends, void *data,
877 const char *color, const char *reset, FILE *file)
878 {
879 char *begin = get_nth_line(line, ends, data);
880 char *end = get_nth_line(line+1, ends, data);
881 int had_nl = 0;
882
883 if (end > begin && end[-1] == '\n') {
884 end--;
885 had_nl = 1;
886 }
887
888 fputs(prefix, file);
889 fputs(color, file);
890 putc(first, file);
891 fwrite(begin, 1, end-begin, file);
892 fputs(reset, file);
893 putc('\n', file);
894 if (!had_nl)
895 fputs("\\ No newline at end of file\n", file);
896 }
897
898 static char *output_prefix(struct diff_options *opt)
899 {
900 char *prefix = "";
901
902 if (opt->output_prefix) {
903 struct strbuf *sb = opt->output_prefix(opt, opt->output_prefix_data);
904 prefix = sb->buf;
905 }
906
907 return prefix;
908 }
909
910 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
911 {
912 unsigned int i, j = 0;
913 long p_lines, t_lines;
914 unsigned long *p_ends = NULL, *t_ends = NULL;
915 struct diff_filepair *pair = range->pair;
916 struct diff_ranges *diff = &range->diff;
917
918 struct diff_options *opt = &rev->diffopt;
919 char *prefix = output_prefix(opt);
920 const char *c_reset = diff_get_color(opt->use_color, DIFF_RESET);
921 const char *c_frag = diff_get_color(opt->use_color, DIFF_FRAGINFO);
922 const char *c_meta = diff_get_color(opt->use_color, DIFF_METAINFO);
923 const char *c_old = diff_get_color(opt->use_color, DIFF_FILE_OLD);
924 const char *c_new = diff_get_color(opt->use_color, DIFF_FILE_NEW);
925 const char *c_context = diff_get_color(opt->use_color, DIFF_CONTEXT);
926
927 if (!pair || !diff)
928 return;
929
930 if (pair->one->oid_valid)
931 fill_line_ends(rev->diffopt.repo, pair->one, &p_lines, &p_ends);
932 fill_line_ends(rev->diffopt.repo, pair->two, &t_lines, &t_ends);
933
934 fprintf(opt->file, "%s%sdiff --git a/%s b/%s%s\n", prefix, c_meta, pair->one->path, pair->two->path, c_reset);
935 fprintf(opt->file, "%s%s--- %s%s%s\n", prefix, c_meta,
936 pair->one->oid_valid ? "a/" : "",
937 pair->one->oid_valid ? pair->one->path : "/dev/null",
938 c_reset);
939 fprintf(opt->file, "%s%s+++ b/%s%s\n", prefix, c_meta, pair->two->path, c_reset);
940 for (i = 0; i < range->ranges.nr; i++) {
941 long p_start, p_end;
942 long t_start = range->ranges.ranges[i].start;
943 long t_end = range->ranges.ranges[i].end;
944 long t_cur = t_start;
945 unsigned int j_last;
946
947 while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
948 j++;
949 if (j == diff->target.nr || diff->target.ranges[j].start > t_end)
950 continue;
951
952 /* Scan ahead to determine the last diff that falls in this range */
953 j_last = j;
954 while (j_last < diff->target.nr && diff->target.ranges[j_last].start < t_end)
955 j_last++;
956 if (j_last > j)
957 j_last--;
958
959 /*
960 * Compute parent hunk headers: we know that the diff
961 * has the correct line numbers (but not all hunks).
962 * So it suffices to shift the start/end according to
963 * the line numbers of the first/last hunk(s) that
964 * fall in this range.
965 */
966 if (t_start < diff->target.ranges[j].start)
967 p_start = diff->parent.ranges[j].start - (diff->target.ranges[j].start-t_start);
968 else
969 p_start = diff->parent.ranges[j].start;
970 if (t_end > diff->target.ranges[j_last].end)
971 p_end = diff->parent.ranges[j_last].end + (t_end-diff->target.ranges[j_last].end);
972 else
973 p_end = diff->parent.ranges[j_last].end;
974
975 if (!p_start && !p_end) {
976 p_start = -1;
977 p_end = -1;
978 }
979
980 /* Now output a diff hunk for this range */
981 fprintf(opt->file, "%s%s@@ -%ld,%ld +%ld,%ld @@%s\n",
982 prefix, c_frag,
983 p_start+1, p_end-p_start, t_start+1, t_end-t_start,
984 c_reset);
985 while (j < diff->target.nr && diff->target.ranges[j].start < t_end) {
986 int k;
987 for (; t_cur < diff->target.ranges[j].start; t_cur++)
988 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
989 c_context, c_reset, opt->file);
990 for (k = diff->parent.ranges[j].start; k < diff->parent.ranges[j].end; k++)
991 print_line(prefix, '-', k, p_ends, pair->one->data,
992 c_old, c_reset, opt->file);
993 for (; t_cur < diff->target.ranges[j].end && t_cur < t_end; t_cur++)
994 print_line(prefix, '+', t_cur, t_ends, pair->two->data,
995 c_new, c_reset, opt->file);
996 j++;
997 }
998 for (; t_cur < t_end; t_cur++)
999 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
1000 c_context, c_reset, opt->file);
1001 }
1002
1003 free(p_ends);
1004 free(t_ends);
1005 }
1006
1007 /*
1008 * NEEDSWORK: manually building a diff here is not the Right
1009 * Thing(tm). log -L should be built into the diff pipeline.
1010 */
1011 static void dump_diff_hacky(struct rev_info *rev, struct line_log_data *range)
1012 {
1013 fprintf(rev->diffopt.file, "%s\n", output_prefix(&rev->diffopt));
1014 while (range) {
1015 dump_diff_hacky_one(rev, range);
1016 range = range->next;
1017 }
1018 }
1019
1020 /*
1021 * Unlike most other functions, this destructively operates on
1022 * 'range'.
1023 */
1024 static int process_diff_filepair(struct rev_info *rev,
1025 struct diff_filepair *pair,
1026 struct line_log_data *range,
1027 struct diff_ranges **diff_out)
1028 {
1029 struct line_log_data *rg = range;
1030 struct range_set tmp;
1031 struct diff_ranges diff;
1032 mmfile_t file_parent, file_target;
1033
1034 assert(pair->two->path);
1035 while (rg) {
1036 assert(rg->path);
1037 if (!strcmp(rg->path, pair->two->path))
1038 break;
1039 rg = rg->next;
1040 }
1041
1042 if (!rg)
1043 return 0;
1044 if (rg->ranges.nr == 0)
1045 return 0;
1046
1047 assert(pair->two->oid_valid);
1048 diff_populate_filespec(rev->diffopt.repo, pair->two, 0);
1049 file_target.ptr = pair->two->data;
1050 file_target.size = pair->two->size;
1051
1052 if (pair->one->oid_valid) {
1053 diff_populate_filespec(rev->diffopt.repo, pair->one, 0);
1054 file_parent.ptr = pair->one->data;
1055 file_parent.size = pair->one->size;
1056 } else {
1057 file_parent.ptr = "";
1058 file_parent.size = 0;
1059 }
1060
1061 diff_ranges_init(&diff);
1062 if (collect_diff(&file_parent, &file_target, &diff))
1063 die("unable to generate diff for %s", pair->one->path);
1064
1065 /* NEEDSWORK should apply some heuristics to prevent mismatches */
1066 free(rg->path);
1067 rg->path = xstrdup(pair->one->path);
1068
1069 range_set_init(&tmp, 0);
1070 range_set_map_across_diff(&tmp, &rg->ranges, &diff, diff_out);
1071 range_set_release(&rg->ranges);
1072 range_set_move(&rg->ranges, &tmp);
1073
1074 diff_ranges_release(&diff);
1075
1076 return ((*diff_out)->parent.nr > 0);
1077 }
1078
1079 static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
1080 {
1081 struct diff_filepair *new_filepair = xmalloc(sizeof(struct diff_filepair));
1082 new_filepair->one = pair->one;
1083 new_filepair->two = pair->two;
1084 new_filepair->one->count++;
1085 new_filepair->two->count++;
1086 return new_filepair;
1087 }
1088
1089 static void free_diffqueues(int n, struct diff_queue_struct *dq)
1090 {
1091 int i, j;
1092 for (i = 0; i < n; i++)
1093 for (j = 0; j < dq[i].nr; j++)
1094 diff_free_filepair(dq[i].queue[j]);
1095 free(dq);
1096 }
1097
1098 static int process_all_files(struct line_log_data **range_out,
1099 struct rev_info *rev,
1100 struct diff_queue_struct *queue,
1101 struct line_log_data *range)
1102 {
1103 int i, changed = 0;
1104
1105 *range_out = line_log_data_copy(range);
1106
1107 for (i = 0; i < queue->nr; i++) {
1108 struct diff_ranges *pairdiff = NULL;
1109 struct diff_filepair *pair = queue->queue[i];
1110 if (process_diff_filepair(rev, pair, *range_out, &pairdiff)) {
1111 /*
1112 * Store away the diff for later output. We
1113 * tuck it in the ranges we got as _input_,
1114 * since that's the commit that caused the
1115 * diff.
1116 *
1117 * NEEDSWORK not enough when we get around to
1118 * doing something interesting with merges;
1119 * currently each invocation on a merge parent
1120 * trashes the previous one's diff.
1121 *
1122 * NEEDSWORK tramples over data structures not owned here
1123 */
1124 struct line_log_data *rg = range;
1125 changed++;
1126 while (rg && strcmp(rg->path, pair->two->path))
1127 rg = rg->next;
1128 assert(rg);
1129 rg->pair = diff_filepair_dup(queue->queue[i]);
1130 memcpy(&rg->diff, pairdiff, sizeof(struct diff_ranges));
1131 }
1132 free(pairdiff);
1133 }
1134
1135 return changed;
1136 }
1137
1138 int line_log_print(struct rev_info *rev, struct commit *commit)
1139 {
1140
1141 show_log(rev);
1142 if (!(rev->diffopt.output_format & DIFF_FORMAT_NO_OUTPUT)) {
1143 struct line_log_data *range = lookup_line_range(rev, commit);
1144 dump_diff_hacky(rev, range);
1145 }
1146 return 1;
1147 }
1148
1149 static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *commit,
1150 struct line_log_data *range)
1151 {
1152 struct commit *parent = NULL;
1153 struct diff_queue_struct queue;
1154 struct line_log_data *parent_range;
1155 int changed;
1156
1157 if (commit->parents)
1158 parent = commit->parents->item;
1159
1160 queue_diffs(range, &rev->diffopt, &queue, commit, parent);
1161 changed = process_all_files(&parent_range, rev, &queue, range);
1162 if (parent)
1163 add_line_range(rev, parent, parent_range);
1164 free_line_log_data(parent_range);
1165 return changed;
1166 }
1167
1168 static int process_ranges_merge_commit(struct rev_info *rev, struct commit *commit,
1169 struct line_log_data *range)
1170 {
1171 struct diff_queue_struct *diffqueues;
1172 struct line_log_data **cand;
1173 struct commit **parents;
1174 struct commit_list *p;
1175 int i;
1176 int nparents = commit_list_count(commit->parents);
1177
1178 if (nparents > 1 && rev->first_parent_only)
1179 nparents = 1;
1180
1181 ALLOC_ARRAY(diffqueues, nparents);
1182 ALLOC_ARRAY(cand, nparents);
1183 ALLOC_ARRAY(parents, nparents);
1184
1185 p = commit->parents;
1186 for (i = 0; i < nparents; i++) {
1187 parents[i] = p->item;
1188 p = p->next;
1189 queue_diffs(range, &rev->diffopt, &diffqueues[i], commit, parents[i]);
1190 }
1191
1192 for (i = 0; i < nparents; i++) {
1193 int changed;
1194 cand[i] = NULL;
1195 changed = process_all_files(&cand[i], rev, &diffqueues[i], range);
1196 if (!changed) {
1197 /*
1198 * This parent can take all the blame, so we
1199 * don't follow any other path in history
1200 */
1201 add_line_range(rev, parents[i], cand[i]);
1202 clear_commit_line_range(rev, commit);
1203 commit_list_append(parents[i], &commit->parents);
1204 free(parents);
1205 free(cand);
1206 free_diffqueues(nparents, diffqueues);
1207 /* NEEDSWORK leaking like a sieve */
1208 return 0;
1209 }
1210 }
1211
1212 /*
1213 * No single parent took the blame. We add the candidates
1214 * from the above loop to the parents.
1215 */
1216 for (i = 0; i < nparents; i++) {
1217 add_line_range(rev, parents[i], cand[i]);
1218 }
1219
1220 clear_commit_line_range(rev, commit);
1221 free(parents);
1222 free(cand);
1223 free_diffqueues(nparents, diffqueues);
1224 return 1;
1225
1226 /* NEEDSWORK evil merge detection stuff */
1227 /* NEEDSWORK leaking like a sieve */
1228 }
1229
1230 static int process_ranges_arbitrary_commit(struct rev_info *rev, struct commit *commit)
1231 {
1232 struct line_log_data *range = lookup_line_range(rev, commit);
1233 int changed = 0;
1234
1235 if (range) {
1236 if (!commit->parents || !commit->parents->next)
1237 changed = process_ranges_ordinary_commit(rev, commit, range);
1238 else
1239 changed = process_ranges_merge_commit(rev, commit, range);
1240 }
1241
1242 if (!changed)
1243 commit->object.flags |= TREESAME;
1244
1245 return changed;
1246 }
1247
1248 static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
1249 {
1250 for (;;) {
1251 struct commit *p = *pp;
1252 if (p->parents && p->parents->next)
1253 return rewrite_one_ok;
1254 if (p->object.flags & UNINTERESTING)
1255 return rewrite_one_ok;
1256 if (!(p->object.flags & TREESAME))
1257 return rewrite_one_ok;
1258 if (!p->parents)
1259 return rewrite_one_noparents;
1260 *pp = p->parents->item;
1261 }
1262 }
1263
1264 int line_log_filter(struct rev_info *rev)
1265 {
1266 struct commit *commit;
1267 struct commit_list *list = rev->commits;
1268 struct commit_list *out = NULL, **pp = &out;
1269
1270 while (list) {
1271 struct commit_list *to_free = NULL;
1272 commit = list->item;
1273 if (process_ranges_arbitrary_commit(rev, commit)) {
1274 *pp = list;
1275 pp = &list->next;
1276 } else
1277 to_free = list;
1278 list = list->next;
1279 free(to_free);
1280 }
1281 *pp = NULL;
1282
1283 for (list = out; list; list = list->next)
1284 rewrite_parents(rev, list->item, line_log_rewrite_one);
1285
1286 rev->commits = out;
1287
1288 return 0;
1289 }