Merge branch 'ax/line-log-range-merge-fix' into maint
[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(rs->ranges);
38 rs->alloc = rs->nr = 0;
39 rs->ranges = NULL;
40 }
41
42 /* dst must be uninitialized! */
43 static void range_set_copy(struct range_set *dst, struct range_set *src)
44 {
45 range_set_init(dst, src->nr);
46 memcpy(dst->ranges, src->ranges, src->nr*sizeof(struct range_set));
47 dst->nr = src->nr;
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 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 int i;
114 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 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;
155 if (i < a->nr && j < b->nr) {
156 if (ra[i].start < rb[j].start)
157 new = &ra[i++];
158 else if (ra[i].start > rb[j].start)
159 new = &rb[j++];
160 else if (ra[i].end < rb[j].end)
161 new = &ra[i++];
162 else
163 new = &rb[j++];
164 } else if (i < a->nr) /* b exhausted */
165 new = &ra[i++];
166 else /* a exhausted */
167 new = &rb[j++];
168 if (new->start == new->end)
169 ; /* empty range */
170 else if (!out->nr || out->ranges[out->nr-1].end < new->start) {
171 range_set_grow(out, 1);
172 out->ranges[out->nr].start = new->start;
173 out->ranges[out->nr].end = new->end;
174 out->nr++;
175 } else if (out->ranges[out->nr-1].end < new->end) {
176 out->ranges[out->nr-1].end = new->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 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 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 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(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 commit *commit, struct diff_filespec *spec)
500 {
501 unsigned mode;
502 unsigned char sha1[20];
503
504 if (get_tree_entry(commit->object.oid.hash, spec->path,
505 sha1, &mode))
506 die("There is no path %s in the commit", spec->path);
507 fill_filespec(spec, sha1, 1, mode);
508
509 return;
510 }
511
512 static void fill_line_ends(struct diff_filespec *spec, long *lines,
513 unsigned long **line_ends)
514 {
515 int num = 0, size = 50;
516 long cur = 0;
517 unsigned long *ends = NULL;
518 char *data = NULL;
519
520 if (diff_populate_filespec(spec, 0))
521 die("Cannot read blob %s", oid_to_hex(&spec->oid));
522
523 ALLOC_ARRAY(ends, size);
524 ends[cur++] = 0;
525 data = spec->data;
526 while (num < spec->size) {
527 if (data[num] == '\n' || num == spec->size - 1) {
528 ALLOC_GROW(ends, (cur + 1), size);
529 ends[cur++] = num;
530 }
531 num++;
532 }
533
534 /* shrink the array to fit the elements */
535 REALLOC_ARRAY(ends, cur);
536 *lines = cur-1;
537 *line_ends = ends;
538 }
539
540 struct nth_line_cb {
541 struct diff_filespec *spec;
542 long lines;
543 unsigned long *line_ends;
544 };
545
546 static const char *nth_line(void *data, long line)
547 {
548 struct nth_line_cb *d = data;
549 assert(d && line <= d->lines);
550 assert(d->spec && d->spec->data);
551
552 if (line == 0)
553 return (char *)d->spec->data;
554 else
555 return (char *)d->spec->data + d->line_ends[line] + 1;
556 }
557
558 static struct line_log_data *
559 parse_lines(struct commit *commit, const char *prefix, struct string_list *args)
560 {
561 long lines = 0;
562 unsigned long *ends = NULL;
563 struct nth_line_cb cb_data;
564 struct string_list_item *item;
565 struct line_log_data *ranges = NULL;
566 struct line_log_data *p;
567
568 for_each_string_list_item(item, args) {
569 const char *name_part, *range_part;
570 char *full_name;
571 struct diff_filespec *spec;
572 long begin = 0, end = 0;
573 long anchor;
574
575 name_part = skip_range_arg(item->string);
576 if (!name_part || *name_part != ':' || !name_part[1])
577 die("-L argument not 'start,end:file' or ':funcname:file': %s",
578 item->string);
579 range_part = xstrndup(item->string, name_part - item->string);
580 name_part++;
581
582 full_name = prefix_path(prefix, prefix ? strlen(prefix) : 0,
583 name_part);
584
585 spec = alloc_filespec(full_name);
586 fill_blob_sha1(commit, spec);
587 fill_line_ends(spec, &lines, &ends);
588 cb_data.spec = spec;
589 cb_data.lines = lines;
590 cb_data.line_ends = ends;
591
592 p = search_line_log_data(ranges, full_name, NULL);
593 if (p && p->ranges.nr)
594 anchor = p->ranges.ranges[p->ranges.nr - 1].end + 1;
595 else
596 anchor = 1;
597
598 if (parse_range_arg(range_part, nth_line, &cb_data,
599 lines, anchor, &begin, &end,
600 full_name))
601 die("malformed -L argument '%s'", range_part);
602 if (lines < end || ((lines || begin) && lines < begin))
603 die("file %s has only %lu lines", name_part, lines);
604 if (begin < 1)
605 begin = 1;
606 if (end < 1)
607 end = lines;
608 begin--;
609 line_log_data_insert(&ranges, full_name, begin, end);
610
611 free_filespec(spec);
612 free(ends);
613 ends = NULL;
614 }
615
616 for (p = ranges; p; p = p->next)
617 sort_and_merge_range_set(&p->ranges);
618
619 return ranges;
620 }
621
622 static struct line_log_data *line_log_data_copy_one(struct line_log_data *r)
623 {
624 struct line_log_data *ret = xmalloc(sizeof(*ret));
625
626 assert(r);
627 line_log_data_init(ret);
628 range_set_copy(&ret->ranges, &r->ranges);
629
630 ret->path = xstrdup(r->path);
631
632 return ret;
633 }
634
635 static struct line_log_data *
636 line_log_data_copy(struct line_log_data *r)
637 {
638 struct line_log_data *ret = NULL;
639 struct line_log_data *tmp = NULL, *prev = NULL;
640
641 assert(r);
642 ret = tmp = prev = line_log_data_copy_one(r);
643 r = r->next;
644 while (r) {
645 tmp = line_log_data_copy_one(r);
646 prev->next = tmp;
647 prev = tmp;
648 r = r->next;
649 }
650
651 return ret;
652 }
653
654 /* merge two range sets across files */
655 static struct line_log_data *line_log_data_merge(struct line_log_data *a,
656 struct line_log_data *b)
657 {
658 struct line_log_data *head = NULL, **pp = &head;
659
660 while (a || b) {
661 struct line_log_data *src;
662 struct line_log_data *src2 = NULL;
663 struct line_log_data *d;
664 int cmp;
665 if (!a)
666 cmp = 1;
667 else if (!b)
668 cmp = -1;
669 else
670 cmp = strcmp(a->path, b->path);
671 if (cmp < 0) {
672 src = a;
673 a = a->next;
674 } else if (cmp == 0) {
675 src = a;
676 a = a->next;
677 src2 = b;
678 b = b->next;
679 } else {
680 src = b;
681 b = b->next;
682 }
683 d = xmalloc(sizeof(struct line_log_data));
684 line_log_data_init(d);
685 d->path = xstrdup(src->path);
686 *pp = d;
687 pp = &d->next;
688 if (src2)
689 range_set_union(&d->ranges, &src->ranges, &src2->ranges);
690 else
691 range_set_copy(&d->ranges, &src->ranges);
692 }
693
694 return head;
695 }
696
697 static void add_line_range(struct rev_info *revs, struct commit *commit,
698 struct line_log_data *range)
699 {
700 struct line_log_data *old = NULL;
701 struct line_log_data *new = NULL;
702
703 old = lookup_decoration(&revs->line_log_data, &commit->object);
704 if (old && range) {
705 new = line_log_data_merge(old, range);
706 free_line_log_data(old);
707 } else if (range)
708 new = line_log_data_copy(range);
709
710 if (new)
711 add_decoration(&revs->line_log_data, &commit->object, new);
712 }
713
714 static void clear_commit_line_range(struct rev_info *revs, struct commit *commit)
715 {
716 struct line_log_data *r;
717 r = lookup_decoration(&revs->line_log_data, &commit->object);
718 if (!r)
719 return;
720 free_line_log_data(r);
721 add_decoration(&revs->line_log_data, &commit->object, NULL);
722 }
723
724 static struct line_log_data *lookup_line_range(struct rev_info *revs,
725 struct commit *commit)
726 {
727 struct line_log_data *ret = NULL;
728 struct line_log_data *d;
729
730 ret = lookup_decoration(&revs->line_log_data, &commit->object);
731
732 for (d = ret; d; d = d->next)
733 range_set_check_invariants(&d->ranges);
734
735 return ret;
736 }
737
738 void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
739 {
740 struct commit *commit = NULL;
741 struct line_log_data *range;
742
743 commit = check_single_commit(rev);
744 range = parse_lines(commit, prefix, args);
745 add_line_range(rev, commit, range);
746
747 if (!rev->diffopt.detect_rename) {
748 struct line_log_data *r;
749 struct argv_array array = ARGV_ARRAY_INIT;
750 const char **paths;
751
752 for (r = range; r; r = r->next)
753 argv_array_push(&array, r->path);
754 paths = argv_array_detach(&array);
755
756 parse_pathspec(&rev->diffopt.pathspec, 0,
757 PATHSPEC_PREFER_FULL, "", paths);
758 /* strings are now owned by pathspec */
759 free(paths);
760 }
761 }
762
763 static void move_diff_queue(struct diff_queue_struct *dst,
764 struct diff_queue_struct *src)
765 {
766 assert(src != dst);
767 memcpy(dst, src, sizeof(struct diff_queue_struct));
768 DIFF_QUEUE_CLEAR(src);
769 }
770
771 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
772 {
773 int i;
774 struct diff_queue_struct outq;
775 DIFF_QUEUE_CLEAR(&outq);
776
777 for (i = 0; i < diff_queued_diff.nr; i++) {
778 struct diff_filepair *p = diff_queued_diff.queue[i];
779 struct line_log_data *rg = NULL;
780
781 if (!DIFF_FILE_VALID(p->two)) {
782 if (keep_deletions)
783 diff_q(&outq, p);
784 else
785 diff_free_filepair(p);
786 continue;
787 }
788 for (rg = range; rg; rg = rg->next) {
789 if (!strcmp(rg->path, p->two->path))
790 break;
791 }
792 if (rg)
793 diff_q(&outq, p);
794 else
795 diff_free_filepair(p);
796 }
797 free(diff_queued_diff.queue);
798 diff_queued_diff = outq;
799 }
800
801 static inline int diff_might_be_rename(void)
802 {
803 int i;
804 for (i = 0; i < diff_queued_diff.nr; i++)
805 if (!DIFF_FILE_VALID(diff_queued_diff.queue[i]->one)) {
806 /* fprintf(stderr, "diff_might_be_rename found creation of: %s\n", */
807 /* diff_queued_diff.queue[i]->two->path); */
808 return 1;
809 }
810 return 0;
811 }
812
813 static void queue_diffs(struct line_log_data *range,
814 struct diff_options *opt,
815 struct diff_queue_struct *queue,
816 struct commit *commit, struct commit *parent)
817 {
818 assert(commit);
819
820 DIFF_QUEUE_CLEAR(&diff_queued_diff);
821 diff_tree_sha1(parent ? parent->tree->object.oid.hash : NULL,
822 commit->tree->object.oid.hash, "", opt);
823 if (opt->detect_rename) {
824 filter_diffs_for_paths(range, 1);
825 if (diff_might_be_rename())
826 diffcore_std(opt);
827 filter_diffs_for_paths(range, 0);
828 }
829 move_diff_queue(queue, &diff_queued_diff);
830 }
831
832 static char *get_nth_line(long line, unsigned long *ends, void *data)
833 {
834 if (line == 0)
835 return (char *)data;
836 else
837 return (char *)data + ends[line] + 1;
838 }
839
840 static void print_line(const char *prefix, char first,
841 long line, unsigned long *ends, void *data,
842 const char *color, const char *reset, FILE *file)
843 {
844 char *begin = get_nth_line(line, ends, data);
845 char *end = get_nth_line(line+1, ends, data);
846 int had_nl = 0;
847
848 if (end > begin && end[-1] == '\n') {
849 end--;
850 had_nl = 1;
851 }
852
853 fputs(prefix, file);
854 fputs(color, file);
855 putc(first, file);
856 fwrite(begin, 1, end-begin, file);
857 fputs(reset, file);
858 putc('\n', file);
859 if (!had_nl)
860 fputs("\\ No newline at end of file\n", file);
861 }
862
863 static char *output_prefix(struct diff_options *opt)
864 {
865 char *prefix = "";
866
867 if (opt->output_prefix) {
868 struct strbuf *sb = opt->output_prefix(opt, opt->output_prefix_data);
869 prefix = sb->buf;
870 }
871
872 return prefix;
873 }
874
875 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
876 {
877 int i, j = 0;
878 long p_lines, t_lines;
879 unsigned long *p_ends = NULL, *t_ends = NULL;
880 struct diff_filepair *pair = range->pair;
881 struct diff_ranges *diff = &range->diff;
882
883 struct diff_options *opt = &rev->diffopt;
884 char *prefix = output_prefix(opt);
885 const char *c_reset = diff_get_color(opt->use_color, DIFF_RESET);
886 const char *c_frag = diff_get_color(opt->use_color, DIFF_FRAGINFO);
887 const char *c_meta = diff_get_color(opt->use_color, DIFF_METAINFO);
888 const char *c_old = diff_get_color(opt->use_color, DIFF_FILE_OLD);
889 const char *c_new = diff_get_color(opt->use_color, DIFF_FILE_NEW);
890 const char *c_context = diff_get_color(opt->use_color, DIFF_CONTEXT);
891
892 if (!pair || !diff)
893 return;
894
895 if (pair->one->oid_valid)
896 fill_line_ends(pair->one, &p_lines, &p_ends);
897 fill_line_ends(pair->two, &t_lines, &t_ends);
898
899 fprintf(opt->file, "%s%sdiff --git a/%s b/%s%s\n", prefix, c_meta, pair->one->path, pair->two->path, c_reset);
900 fprintf(opt->file, "%s%s--- %s%s%s\n", prefix, c_meta,
901 pair->one->oid_valid ? "a/" : "",
902 pair->one->oid_valid ? pair->one->path : "/dev/null",
903 c_reset);
904 fprintf(opt->file, "%s%s+++ b/%s%s\n", prefix, c_meta, pair->two->path, c_reset);
905 for (i = 0; i < range->ranges.nr; i++) {
906 long p_start, p_end;
907 long t_start = range->ranges.ranges[i].start;
908 long t_end = range->ranges.ranges[i].end;
909 long t_cur = t_start;
910 int j_last;
911
912 while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
913 j++;
914 if (j == diff->target.nr || diff->target.ranges[j].start > t_end)
915 continue;
916
917 /* Scan ahead to determine the last diff that falls in this range */
918 j_last = j;
919 while (j_last < diff->target.nr && diff->target.ranges[j_last].start < t_end)
920 j_last++;
921 if (j_last > j)
922 j_last--;
923
924 /*
925 * Compute parent hunk headers: we know that the diff
926 * has the correct line numbers (but not all hunks).
927 * So it suffices to shift the start/end according to
928 * the line numbers of the first/last hunk(s) that
929 * fall in this range.
930 */
931 if (t_start < diff->target.ranges[j].start)
932 p_start = diff->parent.ranges[j].start - (diff->target.ranges[j].start-t_start);
933 else
934 p_start = diff->parent.ranges[j].start;
935 if (t_end > diff->target.ranges[j_last].end)
936 p_end = diff->parent.ranges[j_last].end + (t_end-diff->target.ranges[j_last].end);
937 else
938 p_end = diff->parent.ranges[j_last].end;
939
940 if (!p_start && !p_end) {
941 p_start = -1;
942 p_end = -1;
943 }
944
945 /* Now output a diff hunk for this range */
946 fprintf(opt->file, "%s%s@@ -%ld,%ld +%ld,%ld @@%s\n",
947 prefix, c_frag,
948 p_start+1, p_end-p_start, t_start+1, t_end-t_start,
949 c_reset);
950 while (j < diff->target.nr && diff->target.ranges[j].start < t_end) {
951 int k;
952 for (; t_cur < diff->target.ranges[j].start; t_cur++)
953 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
954 c_context, c_reset, opt->file);
955 for (k = diff->parent.ranges[j].start; k < diff->parent.ranges[j].end; k++)
956 print_line(prefix, '-', k, p_ends, pair->one->data,
957 c_old, c_reset, opt->file);
958 for (; t_cur < diff->target.ranges[j].end && t_cur < t_end; t_cur++)
959 print_line(prefix, '+', t_cur, t_ends, pair->two->data,
960 c_new, c_reset, opt->file);
961 j++;
962 }
963 for (; t_cur < t_end; t_cur++)
964 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
965 c_context, c_reset, opt->file);
966 }
967
968 free(p_ends);
969 free(t_ends);
970 }
971
972 /*
973 * NEEDSWORK: manually building a diff here is not the Right
974 * Thing(tm). log -L should be built into the diff pipeline.
975 */
976 static void dump_diff_hacky(struct rev_info *rev, struct line_log_data *range)
977 {
978 fprintf(rev->diffopt.file, "%s\n", output_prefix(&rev->diffopt));
979 while (range) {
980 dump_diff_hacky_one(rev, range);
981 range = range->next;
982 }
983 }
984
985 /*
986 * Unlike most other functions, this destructively operates on
987 * 'range'.
988 */
989 static int process_diff_filepair(struct rev_info *rev,
990 struct diff_filepair *pair,
991 struct line_log_data *range,
992 struct diff_ranges **diff_out)
993 {
994 struct line_log_data *rg = range;
995 struct range_set tmp;
996 struct diff_ranges diff;
997 mmfile_t file_parent, file_target;
998
999 assert(pair->two->path);
1000 while (rg) {
1001 assert(rg->path);
1002 if (!strcmp(rg->path, pair->two->path))
1003 break;
1004 rg = rg->next;
1005 }
1006
1007 if (!rg)
1008 return 0;
1009 if (rg->ranges.nr == 0)
1010 return 0;
1011
1012 assert(pair->two->oid_valid);
1013 diff_populate_filespec(pair->two, 0);
1014 file_target.ptr = pair->two->data;
1015 file_target.size = pair->two->size;
1016
1017 if (pair->one->oid_valid) {
1018 diff_populate_filespec(pair->one, 0);
1019 file_parent.ptr = pair->one->data;
1020 file_parent.size = pair->one->size;
1021 } else {
1022 file_parent.ptr = "";
1023 file_parent.size = 0;
1024 }
1025
1026 diff_ranges_init(&diff);
1027 if (collect_diff(&file_parent, &file_target, &diff))
1028 die("unable to generate diff for %s", pair->one->path);
1029
1030 /* NEEDSWORK should apply some heuristics to prevent mismatches */
1031 free(rg->path);
1032 rg->path = xstrdup(pair->one->path);
1033
1034 range_set_init(&tmp, 0);
1035 range_set_map_across_diff(&tmp, &rg->ranges, &diff, diff_out);
1036 range_set_release(&rg->ranges);
1037 range_set_move(&rg->ranges, &tmp);
1038
1039 diff_ranges_release(&diff);
1040
1041 return ((*diff_out)->parent.nr > 0);
1042 }
1043
1044 static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
1045 {
1046 struct diff_filepair *new = xmalloc(sizeof(struct diff_filepair));
1047 new->one = pair->one;
1048 new->two = pair->two;
1049 new->one->count++;
1050 new->two->count++;
1051 return new;
1052 }
1053
1054 static void free_diffqueues(int n, struct diff_queue_struct *dq)
1055 {
1056 int i, j;
1057 for (i = 0; i < n; i++)
1058 for (j = 0; j < dq[i].nr; j++)
1059 diff_free_filepair(dq[i].queue[j]);
1060 free(dq);
1061 }
1062
1063 static int process_all_files(struct line_log_data **range_out,
1064 struct rev_info *rev,
1065 struct diff_queue_struct *queue,
1066 struct line_log_data *range)
1067 {
1068 int i, changed = 0;
1069
1070 *range_out = line_log_data_copy(range);
1071
1072 for (i = 0; i < queue->nr; i++) {
1073 struct diff_ranges *pairdiff = NULL;
1074 struct diff_filepair *pair = queue->queue[i];
1075 if (process_diff_filepair(rev, pair, *range_out, &pairdiff)) {
1076 /*
1077 * Store away the diff for later output. We
1078 * tuck it in the ranges we got as _input_,
1079 * since that's the commit that caused the
1080 * diff.
1081 *
1082 * NEEDSWORK not enough when we get around to
1083 * doing something interesting with merges;
1084 * currently each invocation on a merge parent
1085 * trashes the previous one's diff.
1086 *
1087 * NEEDSWORK tramples over data structures not owned here
1088 */
1089 struct line_log_data *rg = range;
1090 changed++;
1091 while (rg && strcmp(rg->path, pair->two->path))
1092 rg = rg->next;
1093 assert(rg);
1094 rg->pair = diff_filepair_dup(queue->queue[i]);
1095 memcpy(&rg->diff, pairdiff, sizeof(struct diff_ranges));
1096 }
1097 free(pairdiff);
1098 }
1099
1100 return changed;
1101 }
1102
1103 int line_log_print(struct rev_info *rev, struct commit *commit)
1104 {
1105 struct line_log_data *range = lookup_line_range(rev, commit);
1106
1107 show_log(rev);
1108 dump_diff_hacky(rev, range);
1109 return 1;
1110 }
1111
1112 static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *commit,
1113 struct line_log_data *range)
1114 {
1115 struct commit *parent = NULL;
1116 struct diff_queue_struct queue;
1117 struct line_log_data *parent_range;
1118 int changed;
1119
1120 if (commit->parents)
1121 parent = commit->parents->item;
1122
1123 queue_diffs(range, &rev->diffopt, &queue, commit, parent);
1124 changed = process_all_files(&parent_range, rev, &queue, range);
1125 if (parent)
1126 add_line_range(rev, parent, parent_range);
1127 return changed;
1128 }
1129
1130 static int process_ranges_merge_commit(struct rev_info *rev, struct commit *commit,
1131 struct line_log_data *range)
1132 {
1133 struct diff_queue_struct *diffqueues;
1134 struct line_log_data **cand;
1135 struct commit **parents;
1136 struct commit_list *p;
1137 int i;
1138 int nparents = commit_list_count(commit->parents);
1139
1140 if (nparents > 1 && rev->first_parent_only)
1141 nparents = 1;
1142
1143 ALLOC_ARRAY(diffqueues, nparents);
1144 ALLOC_ARRAY(cand, nparents);
1145 ALLOC_ARRAY(parents, nparents);
1146
1147 p = commit->parents;
1148 for (i = 0; i < nparents; i++) {
1149 parents[i] = p->item;
1150 p = p->next;
1151 queue_diffs(range, &rev->diffopt, &diffqueues[i], commit, parents[i]);
1152 }
1153
1154 for (i = 0; i < nparents; i++) {
1155 int changed;
1156 cand[i] = NULL;
1157 changed = process_all_files(&cand[i], rev, &diffqueues[i], range);
1158 if (!changed) {
1159 /*
1160 * This parent can take all the blame, so we
1161 * don't follow any other path in history
1162 */
1163 add_line_range(rev, parents[i], cand[i]);
1164 clear_commit_line_range(rev, commit);
1165 commit_list_append(parents[i], &commit->parents);
1166 free(parents);
1167 free(cand);
1168 free_diffqueues(nparents, diffqueues);
1169 /* NEEDSWORK leaking like a sieve */
1170 return 0;
1171 }
1172 }
1173
1174 /*
1175 * No single parent took the blame. We add the candidates
1176 * from the above loop to the parents.
1177 */
1178 for (i = 0; i < nparents; i++) {
1179 add_line_range(rev, parents[i], cand[i]);
1180 }
1181
1182 clear_commit_line_range(rev, commit);
1183 free(parents);
1184 free(cand);
1185 free_diffqueues(nparents, diffqueues);
1186 return 1;
1187
1188 /* NEEDSWORK evil merge detection stuff */
1189 /* NEEDSWORK leaking like a sieve */
1190 }
1191
1192 static int process_ranges_arbitrary_commit(struct rev_info *rev, struct commit *commit)
1193 {
1194 struct line_log_data *range = lookup_line_range(rev, commit);
1195 int changed = 0;
1196
1197 if (range) {
1198 if (!commit->parents || !commit->parents->next)
1199 changed = process_ranges_ordinary_commit(rev, commit, range);
1200 else
1201 changed = process_ranges_merge_commit(rev, commit, range);
1202 }
1203
1204 if (!changed)
1205 commit->object.flags |= TREESAME;
1206
1207 return changed;
1208 }
1209
1210 static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
1211 {
1212 for (;;) {
1213 struct commit *p = *pp;
1214 if (p->parents && p->parents->next)
1215 return rewrite_one_ok;
1216 if (p->object.flags & UNINTERESTING)
1217 return rewrite_one_ok;
1218 if (!(p->object.flags & TREESAME))
1219 return rewrite_one_ok;
1220 if (!p->parents)
1221 return rewrite_one_noparents;
1222 *pp = p->parents->item;
1223 }
1224 }
1225
1226 int line_log_filter(struct rev_info *rev)
1227 {
1228 struct commit *commit;
1229 struct commit_list *list = rev->commits;
1230 struct commit_list *out = NULL, **pp = &out;
1231
1232 while (list) {
1233 struct commit_list *to_free = NULL;
1234 commit = list->item;
1235 if (process_ranges_arbitrary_commit(rev, commit)) {
1236 *pp = list;
1237 pp = &list->next;
1238 } else
1239 to_free = list;
1240 list = list->next;
1241 free(to_free);
1242 }
1243 *pp = NULL;
1244
1245 for (list = out; list; list = list->next)
1246 rewrite_parents(rev, list->item, line_log_rewrite_one);
1247
1248 rev->commits = out;
1249
1250 return 0;
1251 }