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typofix: documentation
[git/gitweb.git] / line-log.c
blob8cc29a0000f8456331457c0d247c242f3113517e
1 #include "git-compat-util.h"
2 #include "line-range.h"
3 #include "cache.h"
4 #include "tag.h"
5 #include "blob.h"
6 #include "tree.h"
7 #include "diff.h"
8 #include "commit.h"
9 #include "decorate.h"
10 #include "revision.h"
11 #include "xdiff-interface.h"
12 #include "strbuf.h"
13 #include "log-tree.h"
14 #include "graph.h"
15 #include "userdiff.h"
16 #include "line-log.h"
17
18 static void range_set_grow(struct range_set *rs, size_t extra)
19 {
20 ALLOC_GROW(rs->ranges, rs->nr + extra, rs->alloc);
21 }
22
23 /* Either initialization would be fine */
24 #define RANGE_SET_INIT {0}
25
26 static void range_set_init(struct range_set *rs, size_t prealloc)
27 {
28 rs->alloc = rs->nr = 0;
29 rs->ranges = NULL;
30 if (prealloc)
31 range_set_grow(rs, prealloc);
32 }
33
34 static void range_set_release(struct range_set *rs)
35 {
36 free(rs->ranges);
37 rs->alloc = rs->nr = 0;
38 rs->ranges = NULL;
39 }
40
41 /* dst must be uninitialized! */
42 static void range_set_copy(struct range_set *dst, struct range_set *src)
43 {
44 range_set_init(dst, src->nr);
45 memcpy(dst->ranges, src->ranges, src->nr*sizeof(struct range_set));
46 dst->nr = src->nr;
47 }
48 static void range_set_move(struct range_set *dst, struct range_set *src)
49 {
50 range_set_release(dst);
51 dst->ranges = src->ranges;
52 dst->nr = src->nr;
53 dst->alloc = src->alloc;
54 src->ranges = NULL;
55 src->alloc = src->nr = 0;
56 }
57
58 /* tack on a _new_ range _at the end_ */
59 static void range_set_append_unsafe(struct range_set *rs, long a, long b)
60 {
61 assert(a <= b);
62 range_set_grow(rs, 1);
63 rs->ranges[rs->nr].start = a;
64 rs->ranges[rs->nr].end = b;
65 rs->nr++;
66 }
67
68 static void range_set_append(struct range_set *rs, long a, long b)
69 {
70 assert(rs->nr == 0 || rs->ranges[rs->nr-1].end <= a);
71 range_set_append_unsafe(rs, a, b);
72 }
73
74 static int range_cmp(const void *_r, const void *_s)
75 {
76 const struct range *r = _r;
77 const struct range *s = _s;
78
79 /* this could be simply 'return r.start-s.start', but for the types */
80 if (r->start == s->start)
81 return 0;
82 if (r->start < s->start)
83 return -1;
84 return 1;
85 }
86
87 /*
88 * Check that the ranges are non-empty, sorted and non-overlapping
89 */
90 static void range_set_check_invariants(struct range_set *rs)
91 {
92 int i;
93
94 if (!rs)
95 return;
96
97 if (rs->nr)
98 assert(rs->ranges[0].start < rs->ranges[0].end);
99
100 for (i = 1; i < rs->nr; i++) {
101 assert(rs->ranges[i-1].end < rs->ranges[i].start);
102 assert(rs->ranges[i].start < rs->ranges[i].end);
103 }
104 }
105
106 /*
107 * In-place pass of sorting and merging the ranges in the range set,
108 * to establish the invariants when we get the ranges from the user
109 */
110 static void sort_and_merge_range_set(struct range_set *rs)
111 {
112 int i;
113 int o = 1; /* output cursor */
114
115 qsort(rs->ranges, rs->nr, sizeof(struct range), range_cmp);
116
117 for (i = 1; i < rs->nr; i++) {
118 if (rs->ranges[i].start <= rs->ranges[o-1].end) {
119 if (rs->ranges[o-1].end < rs->ranges[i].end)
120 rs->ranges[o-1].end = rs->ranges[i].end;
121 } else {
122 rs->ranges[o].start = rs->ranges[i].start;
123 rs->ranges[o].end = rs->ranges[i].end;
124 o++;
125 }
126 }
127 assert(o <= rs->nr);
128 rs->nr = o;
129
130 range_set_check_invariants(rs);
131 }
132
133 /*
134 * Union of range sets (i.e., sets of line numbers). Used to merge
135 * them when searches meet at a common ancestor.
136 *
137 * This is also where the ranges are consolidated into canonical form:
138 * overlapping and adjacent ranges are merged, and empty ranges are
139 * removed.
140 */
141 static void range_set_union(struct range_set *out,
142 struct range_set *a, struct range_set *b)
143 {
144 int i = 0, j = 0, o = 0;
145 struct range *ra = a->ranges;
146 struct range *rb = b->ranges;
147 /* cannot make an alias of out->ranges: it may change during grow */
148
149 assert(out->nr == 0);
150 while (i < a->nr || j < b->nr) {
151 struct range *new;
152 if (i < a->nr && j < b->nr) {
153 if (ra[i].start < rb[j].start)
154 new = &ra[i++];
155 else if (ra[i].start > rb[j].start)
156 new = &rb[j++];
157 else if (ra[i].end < rb[j].end)
158 new = &ra[i++];
159 else
160 new = &rb[j++];
161 } else if (i < a->nr) /* b exhausted */
162 new = &ra[i++];
163 else /* a exhausted */
164 new = &rb[j++];
165 if (new->start == new->end)
166 ; /* empty range */
167 else if (!o || out->ranges[o-1].end < new->start) {
168 range_set_grow(out, 1);
169 out->ranges[o].start = new->start;
170 out->ranges[o].end = new->end;
171 o++;
172 } else if (out->ranges[o-1].end < new->end) {
173 out->ranges[o-1].end = new->end;
174 }
175 }
176 out->nr = o;
177 }
178
179 /*
180 * Difference of range sets (out = a \ b). Pass the "interesting"
181 * ranges as 'a' and the target side of the diff as 'b': it removes
182 * the ranges for which the commit is responsible.
183 */
184 static void range_set_difference(struct range_set *out,
185 struct range_set *a, struct range_set *b)
186 {
187 int i, j = 0;
188 for (i = 0; i < a->nr; i++) {
189 long start = a->ranges[i].start;
190 long end = a->ranges[i].end;
191 while (start < end) {
192 while (j < b->nr && start >= b->ranges[j].end)
193 /*
194 * a: |-------
195 * b: ------|
196 */
197 j++;
198 if (j >= b->nr || end < b->ranges[j].start) {
199 /*
200 * b exhausted, or
201 * a: ----|
202 * b: |----
203 */
204 range_set_append(out, start, end);
205 break;
206 }
207 if (start >= b->ranges[j].start) {
208 /*
209 * a: |--????
210 * b: |------|
211 */
212 start = b->ranges[j].end;
213 } else if (end > b->ranges[j].start) {
214 /*
215 * a: |-----|
216 * b: |--?????
217 */
218 if (start < b->ranges[j].start)
219 range_set_append(out, start, b->ranges[j].start);
220 start = b->ranges[j].end;
221 }
222 }
223 }
224 }
225
226 static void diff_ranges_init(struct diff_ranges *diff)
227 {
228 range_set_init(&diff->parent, 0);
229 range_set_init(&diff->target, 0);
230 }
231
232 static void diff_ranges_release(struct diff_ranges *diff)
233 {
234 range_set_release(&diff->parent);
235 range_set_release(&diff->target);
236 }
237
238 void line_log_data_init(struct line_log_data *r)
239 {
240 memset(r, 0, sizeof(struct line_log_data));
241 range_set_init(&r->ranges, 0);
242 }
243
244 static void line_log_data_clear(struct line_log_data *r)
245 {
246 range_set_release(&r->ranges);
247 if (r->pair)
248 diff_free_filepair(r->pair);
249 }
250
251 static void free_line_log_data(struct line_log_data *r)
252 {
253 while (r) {
254 struct line_log_data *next = r->next;
255 line_log_data_clear(r);
256 free(r);
257 r = next;
258 }
259 }
260
261 static struct line_log_data *
262 search_line_log_data(struct line_log_data *list, const char *path,
263 struct line_log_data **insertion_point)
264 {
265 struct line_log_data *p = list;
266 if (insertion_point)
267 *insertion_point = NULL;
268 while (p) {
269 int cmp = strcmp(p->path, path);
270 if (!cmp)
271 return p;
272 if (insertion_point && cmp < 0)
273 *insertion_point = p;
274 p = p->next;
275 }
276 return NULL;
277 }
278
279 /*
280 * Note: takes ownership of 'path', which happens to be what the only
281 * caller needs.
282 */
283 static void line_log_data_insert(struct line_log_data **list,
284 char *path,
285 long begin, long end)
286 {
287 struct line_log_data *ip;
288 struct line_log_data *p = search_line_log_data(*list, path, &ip);
289
290 if (p) {
291 range_set_append_unsafe(&p->ranges, begin, end);
292 sort_and_merge_range_set(&p->ranges);
293 free(path);
294 return;
295 }
296
297 p = xcalloc(1, sizeof(struct line_log_data));
298 p->path = path;
299 range_set_append(&p->ranges, begin, end);
300 if (ip) {
301 p->next = ip->next;
302 ip->next = p;
303 } else {
304 p->next = *list;
305 *list = p;
306 }
307 }
308
309 struct collect_diff_cbdata {
310 struct diff_ranges *diff;
311 };
312
313 static int collect_diff_cb(long start_a, long count_a,
314 long start_b, long count_b,
315 void *data)
316 {
317 struct collect_diff_cbdata *d = data;
318
319 if (count_a >= 0)
320 range_set_append(&d->diff->parent, start_a, start_a + count_a);
321 if (count_b >= 0)
322 range_set_append(&d->diff->target, start_b, start_b + count_b);
323
324 return 0;
325 }
326
327 static void collect_diff(mmfile_t *parent, mmfile_t *target, struct diff_ranges *out)
328 {
329 struct collect_diff_cbdata cbdata = {NULL};
330 xpparam_t xpp;
331 xdemitconf_t xecfg;
332 xdemitcb_t ecb;
333
334 memset(&xpp, 0, sizeof(xpp));
335 memset(&xecfg, 0, sizeof(xecfg));
336 xecfg.ctxlen = xecfg.interhunkctxlen = 0;
337
338 cbdata.diff = out;
339 xecfg.hunk_func = collect_diff_cb;
340 memset(&ecb, 0, sizeof(ecb));
341 ecb.priv = &cbdata;
342 xdi_diff(parent, target, &xpp, &xecfg, &ecb);
343 }
344
345 /*
346 * These are handy for debugging. Removing them with #if 0 silences
347 * the "unused function" warning.
348 */
349 #if 0
350 static void dump_range_set(struct range_set *rs, const char *desc)
351 {
352 int i;
353 printf("range set %s (%d items):\n", desc, rs->nr);
354 for (i = 0; i < rs->nr; i++)
355 printf("\t[%ld,%ld]\n", rs->ranges[i].start, rs->ranges[i].end);
356 }
357
358 static void dump_line_log_data(struct line_log_data *r)
359 {
360 char buf[4096];
361 while (r) {
362 snprintf(buf, 4096, "file %s\n", r->path);
363 dump_range_set(&r->ranges, buf);
364 r = r->next;
365 }
366 }
367
368 static void dump_diff_ranges(struct diff_ranges *diff, const char *desc)
369 {
370 int i;
371 assert(diff->parent.nr == diff->target.nr);
372 printf("diff ranges %s (%d items):\n", desc, diff->parent.nr);
373 printf("\tparent\ttarget\n");
374 for (i = 0; i < diff->parent.nr; i++) {
375 printf("\t[%ld,%ld]\t[%ld,%ld]\n",
376 diff->parent.ranges[i].start,
377 diff->parent.ranges[i].end,
378 diff->target.ranges[i].start,
379 diff->target.ranges[i].end);
380 }
381 }
382 #endif
383
384
385 static int ranges_overlap(struct range *a, struct range *b)
386 {
387 return !(a->end <= b->start || b->end <= a->start);
388 }
389
390 /*
391 * Given a diff and the set of interesting ranges, determine all hunks
392 * of the diff which touch (overlap) at least one of the interesting
393 * ranges in the target.
394 */
395 static void diff_ranges_filter_touched(struct diff_ranges *out,
396 struct diff_ranges *diff,
397 struct range_set *rs)
398 {
399 int i, j = 0;
400
401 assert(out->target.nr == 0);
402
403 for (i = 0; i < diff->target.nr; i++) {
404 while (diff->target.ranges[i].start > rs->ranges[j].end) {
405 j++;
406 if (j == rs->nr)
407 return;
408 }
409 if (ranges_overlap(&diff->target.ranges[i], &rs->ranges[j])) {
410 range_set_append(&out->parent,
411 diff->parent.ranges[i].start,
412 diff->parent.ranges[i].end);
413 range_set_append(&out->target,
414 diff->target.ranges[i].start,
415 diff->target.ranges[i].end);
416 }
417 }
418 }
419
420 /*
421 * Adjust the line counts in 'rs' to account for the lines
422 * added/removed in the diff.
423 */
424 static void range_set_shift_diff(struct range_set *out,
425 struct range_set *rs,
426 struct diff_ranges *diff)
427 {
428 int i, j = 0;
429 long offset = 0;
430 struct range *src = rs->ranges;
431 struct range *target = diff->target.ranges;
432 struct range *parent = diff->parent.ranges;
433
434 for (i = 0; i < rs->nr; i++) {
435 while (j < diff->target.nr && src[i].start >= target[j].start) {
436 offset += (parent[j].end-parent[j].start)
437 - (target[j].end-target[j].start);
438 j++;
439 }
440 range_set_append(out, src[i].start+offset, src[i].end+offset);
441 }
442 }
443
444 /*
445 * Given a diff and the set of interesting ranges, map the ranges
446 * across the diff. That is: observe that the target commit takes
447 * blame for all the + (target-side) ranges. So for every pair of
448 * ranges in the diff that was touched, we remove the latter and add
449 * its parent side.
450 */
451 static void range_set_map_across_diff(struct range_set *out,
452 struct range_set *rs,
453 struct diff_ranges *diff,
454 struct diff_ranges **touched_out)
455 {
456 struct diff_ranges *touched = xmalloc(sizeof(*touched));
457 struct range_set tmp1 = RANGE_SET_INIT;
458 struct range_set tmp2 = RANGE_SET_INIT;
459
460 diff_ranges_init(touched);
461 diff_ranges_filter_touched(touched, diff, rs);
462 range_set_difference(&tmp1, rs, &touched->target);
463 range_set_shift_diff(&tmp2, &tmp1, diff);
464 range_set_union(out, &tmp2, &touched->parent);
465 range_set_release(&tmp1);
466 range_set_release(&tmp2);
467
468 *touched_out = touched;
469 }
470
471 static struct commit *check_single_commit(struct rev_info *revs)
472 {
473 struct object *commit = NULL;
474 int found = -1;
475 int i;
476
477 for (i = 0; i < revs->pending.nr; i++) {
478 struct object *obj = revs->pending.objects[i].item;
479 if (obj->flags & UNINTERESTING)
480 continue;
481 while (obj->type == OBJ_TAG)
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.sha1, 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", sha1_to_hex(spec->sha1));
522
523 ends = xmalloc(size * sizeof(*ends));
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 ends = xrealloc(ends, cur * sizeof(*ends));
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
567 for_each_string_list_item(item, args) {
568 const char *name_part, *range_part;
569 char *full_name;
570 struct diff_filespec *spec;
571 long begin = 0, end = 0;
572
573 name_part = skip_range_arg(item->string);
574 if (!name_part || *name_part != ':' || !name_part[1])
575 die("-L argument '%s' not of the form start,end:file",
576 item->string);
577 range_part = xstrndup(item->string, name_part - item->string);
578 name_part++;
579
580 full_name = prefix_path(prefix, prefix ? strlen(prefix) : 0,
581 name_part);
582
583 spec = alloc_filespec(full_name);
584 fill_blob_sha1(commit, spec);
585 fill_line_ends(spec, &lines, &ends);
586 cb_data.spec = spec;
587 cb_data.lines = lines;
588 cb_data.line_ends = ends;
589
590 if (parse_range_arg(range_part, nth_line, &cb_data,
591 lines, &begin, &end,
592 full_name))
593 die("malformed -L argument '%s'", range_part);
594 if (begin < 1)
595 begin = 1;
596 if (end < 1)
597 end = lines;
598 begin--;
599 if (lines < end || lines < begin)
600 die("file %s has only %ld lines", name_part, lines);
601 line_log_data_insert(&ranges, full_name, begin, end);
602
603 free_filespec(spec);
604 free(ends);
605 ends = NULL;
606 }
607
608 return ranges;
609 }
610
611 static struct line_log_data *line_log_data_copy_one(struct line_log_data *r)
612 {
613 struct line_log_data *ret = xmalloc(sizeof(*ret));
614
615 assert(r);
616 line_log_data_init(ret);
617 range_set_copy(&ret->ranges, &r->ranges);
618
619 ret->path = xstrdup(r->path);
620
621 return ret;
622 }
623
624 static struct line_log_data *
625 line_log_data_copy(struct line_log_data *r)
626 {
627 struct line_log_data *ret = NULL;
628 struct line_log_data *tmp = NULL, *prev = NULL;
629
630 assert(r);
631 ret = tmp = prev = line_log_data_copy_one(r);
632 r = r->next;
633 while (r) {
634 tmp = line_log_data_copy_one(r);
635 prev->next = tmp;
636 prev = tmp;
637 r = r->next;
638 }
639
640 return ret;
641 }
642
643 /* merge two range sets across files */
644 static struct line_log_data *line_log_data_merge(struct line_log_data *a,
645 struct line_log_data *b)
646 {
647 struct line_log_data *head = NULL, **pp = &head;
648
649 while (a || b) {
650 struct line_log_data *src;
651 struct line_log_data *src2 = NULL;
652 struct line_log_data *d;
653 int cmp;
654 if (!a)
655 cmp = 1;
656 else if (!b)
657 cmp = -1;
658 else
659 cmp = strcmp(a->path, b->path);
660 if (cmp < 0) {
661 src = a;
662 a = a->next;
663 } else if (cmp == 0) {
664 src = a;
665 a = a->next;
666 src2 = b;
667 b = b->next;
668 } else {
669 src = b;
670 b = b->next;
671 }
672 d = xmalloc(sizeof(struct line_log_data));
673 line_log_data_init(d);
674 d->path = xstrdup(src->path);
675 *pp = d;
676 pp = &d->next;
677 if (src2)
678 range_set_union(&d->ranges, &src->ranges, &src2->ranges);
679 else
680 range_set_copy(&d->ranges, &src->ranges);
681 }
682
683 return head;
684 }
685
686 static void add_line_range(struct rev_info *revs, struct commit *commit,
687 struct line_log_data *range)
688 {
689 struct line_log_data *old = NULL;
690 struct line_log_data *new = NULL;
691
692 old = lookup_decoration(&revs->line_log_data, &commit->object);
693 if (old && range) {
694 new = line_log_data_merge(old, range);
695 free_line_log_data(old);
696 } else if (range)
697 new = line_log_data_copy(range);
698
699 if (new)
700 add_decoration(&revs->line_log_data, &commit->object, new);
701 }
702
703 static void clear_commit_line_range(struct rev_info *revs, struct commit *commit)
704 {
705 struct line_log_data *r;
706 r = lookup_decoration(&revs->line_log_data, &commit->object);
707 if (!r)
708 return;
709 free_line_log_data(r);
710 add_decoration(&revs->line_log_data, &commit->object, NULL);
711 }
712
713 static struct line_log_data *lookup_line_range(struct rev_info *revs,
714 struct commit *commit)
715 {
716 struct line_log_data *ret = NULL;
717 struct line_log_data *d;
718
719 ret = lookup_decoration(&revs->line_log_data, &commit->object);
720
721 for (d = ret; d; d = d->next)
722 range_set_check_invariants(&d->ranges);
723
724 return ret;
725 }
726
727 void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
728 {
729 struct commit *commit = NULL;
730 struct line_log_data *range;
731
732 commit = check_single_commit(rev);
733 range = parse_lines(commit, prefix, args);
734 add_line_range(rev, commit, range);
735
736 if (!rev->diffopt.detect_rename) {
737 int i, count = 0;
738 struct line_log_data *r = range;
739 const char **paths;
740 while (r) {
741 count++;
742 r = r->next;
743 }
744 paths = xmalloc((count+1)*sizeof(char *));
745 r = range;
746 for (i = 0; i < count; i++) {
747 paths[i] = xstrdup(r->path);
748 r = r->next;
749 }
750 paths[count] = NULL;
751 init_pathspec(&rev->diffopt.pathspec, paths);
752 free(paths);
753 }
754 }
755
756 static void load_tree_desc(struct tree_desc *desc, void **tree,
757 const unsigned char *sha1)
758 {
759 unsigned long size;
760 *tree = read_object_with_reference(sha1, tree_type, &size, NULL);
761 if (!*tree)
762 die("Unable to read tree (%s)", sha1_to_hex(sha1));
763 init_tree_desc(desc, *tree, size);
764 }
765
766 static int count_parents(struct commit *commit)
767 {
768 struct commit_list *parents = commit->parents;
769 int count = 0;
770 while (parents) {
771 count++;
772 parents = parents->next;
773 }
774 return count;
775 }
776
777 static void move_diff_queue(struct diff_queue_struct *dst,
778 struct diff_queue_struct *src)
779 {
780 assert(src != dst);
781 memcpy(dst, src, sizeof(struct diff_queue_struct));
782 DIFF_QUEUE_CLEAR(src);
783 }
784
785 static void filter_diffs_for_paths(struct line_log_data *range, int keep_deletions)
786 {
787 int i;
788 struct diff_queue_struct outq;
789 DIFF_QUEUE_CLEAR(&outq);
790
791 for (i = 0; i < diff_queued_diff.nr; i++) {
792 struct diff_filepair *p = diff_queued_diff.queue[i];
793 struct line_log_data *rg = NULL;
794
795 if (!DIFF_FILE_VALID(p->two)) {
796 if (keep_deletions)
797 diff_q(&outq, p);
798 else
799 diff_free_filepair(p);
800 continue;
801 }
802 for (rg = range; rg; rg = rg->next) {
803 if (!strcmp(rg->path, p->two->path))
804 break;
805 }
806 if (rg)
807 diff_q(&outq, p);
808 else
809 diff_free_filepair(p);
810 }
811 free(diff_queued_diff.queue);
812 diff_queued_diff = outq;
813 }
814
815 static inline int diff_might_be_rename(void)
816 {
817 int i;
818 for (i = 0; i < diff_queued_diff.nr; i++)
819 if (!DIFF_FILE_VALID(diff_queued_diff.queue[i]->one)) {
820 /* fprintf(stderr, "diff_might_be_rename found creation of: %s\n", */
821 /* diff_queued_diff.queue[i]->two->path); */
822 return 1;
823 }
824 return 0;
825 }
826
827 static void queue_diffs(struct line_log_data *range,
828 struct diff_options *opt,
829 struct diff_queue_struct *queue,
830 struct commit *commit, struct commit *parent)
831 {
832 void *tree1 = NULL, *tree2 = NULL;
833 struct tree_desc desc1, desc2;
834
835 assert(commit);
836 load_tree_desc(&desc2, &tree2, commit->tree->object.sha1);
837 if (parent)
838 load_tree_desc(&desc1, &tree1, parent->tree->object.sha1);
839 else
840 init_tree_desc(&desc1, "", 0);
841
842 DIFF_QUEUE_CLEAR(&diff_queued_diff);
843 diff_tree(&desc1, &desc2, "", opt);
844 if (opt->detect_rename) {
845 filter_diffs_for_paths(range, 1);
846 if (diff_might_be_rename())
847 diffcore_std(opt);
848 filter_diffs_for_paths(range, 0);
849 }
850 move_diff_queue(queue, &diff_queued_diff);
851
852 if (tree1)
853 free(tree1);
854 if (tree2)
855 free(tree2);
856 }
857
858 static char *get_nth_line(long line, unsigned long *ends, void *data)
859 {
860 if (line == 0)
861 return (char *)data;
862 else
863 return (char *)data + ends[line] + 1;
864 }
865
866 static void print_line(const char *prefix, char first,
867 long line, unsigned long *ends, void *data,
868 const char *color, const char *reset)
869 {
870 char *begin = get_nth_line(line, ends, data);
871 char *end = get_nth_line(line+1, ends, data);
872 int had_nl = 0;
873
874 if (end > begin && end[-1] == '\n') {
875 end--;
876 had_nl = 1;
877 }
878
879 fputs(prefix, stdout);
880 fputs(color, stdout);
881 putchar(first);
882 fwrite(begin, 1, end-begin, stdout);
883 fputs(reset, stdout);
884 putchar('\n');
885 if (!had_nl)
886 fputs("\\ No newline at end of file\n", stdout);
887 }
888
889 static char *output_prefix(struct diff_options *opt)
890 {
891 char *prefix = "";
892
893 if (opt->output_prefix) {
894 struct strbuf *sb = opt->output_prefix(opt, opt->output_prefix_data);
895 prefix = sb->buf;
896 }
897
898 return prefix;
899 }
900
901 static void dump_diff_hacky_one(struct rev_info *rev, struct line_log_data *range)
902 {
903 int i, j = 0;
904 long p_lines, t_lines;
905 unsigned long *p_ends = NULL, *t_ends = NULL;
906 struct diff_filepair *pair = range->pair;
907 struct diff_ranges *diff = &range->diff;
908
909 struct diff_options *opt = &rev->diffopt;
910 char *prefix = output_prefix(opt);
911 const char *c_reset = diff_get_color(opt->use_color, DIFF_RESET);
912 const char *c_frag = diff_get_color(opt->use_color, DIFF_FRAGINFO);
913 const char *c_meta = diff_get_color(opt->use_color, DIFF_METAINFO);
914 const char *c_old = diff_get_color(opt->use_color, DIFF_FILE_OLD);
915 const char *c_new = diff_get_color(opt->use_color, DIFF_FILE_NEW);
916 const char *c_plain = diff_get_color(opt->use_color, DIFF_PLAIN);
917
918 if (!pair || !diff)
919 return;
920
921 if (pair->one->sha1_valid)
922 fill_line_ends(pair->one, &p_lines, &p_ends);
923 fill_line_ends(pair->two, &t_lines, &t_ends);
924
925 printf("%s%sdiff --git a/%s b/%s%s\n", prefix, c_meta, pair->one->path, pair->two->path, c_reset);
926 printf("%s%s--- %s%s%s\n", prefix, c_meta,
927 pair->one->sha1_valid ? "a/" : "",
928 pair->one->sha1_valid ? pair->one->path : "/dev/null",
929 c_reset);
930 printf("%s%s+++ b/%s%s\n", prefix, c_meta, pair->two->path, c_reset);
931 for (i = 0; i < range->ranges.nr; i++) {
932 long p_start, p_end;
933 long t_start = range->ranges.ranges[i].start;
934 long t_end = range->ranges.ranges[i].end;
935 long t_cur = t_start;
936 int j_last;
937
938 while (j < diff->target.nr && diff->target.ranges[j].end < t_start)
939 j++;
940 if (j == diff->target.nr || diff->target.ranges[j].start > t_end)
941 continue;
942
943 /* Scan ahead to determine the last diff that falls in this range */
944 j_last = j;
945 while (j_last < diff->target.nr && diff->target.ranges[j_last].start < t_end)
946 j_last++;
947 if (j_last > j)
948 j_last--;
949
950 /*
951 * Compute parent hunk headers: we know that the diff
952 * has the correct line numbers (but not all hunks).
953 * So it suffices to shift the start/end according to
954 * the line numbers of the first/last hunk(s) that
955 * fall in this range.
956 */
957 if (t_start < diff->target.ranges[j].start)
958 p_start = diff->parent.ranges[j].start - (diff->target.ranges[j].start-t_start);
959 else
960 p_start = diff->parent.ranges[j].start;
961 if (t_end > diff->target.ranges[j_last].end)
962 p_end = diff->parent.ranges[j_last].end + (t_end-diff->target.ranges[j_last].end);
963 else
964 p_end = diff->parent.ranges[j_last].end;
965
966 if (!p_start && !p_end) {
967 p_start = -1;
968 p_end = -1;
969 }
970
971 /* Now output a diff hunk for this range */
972 printf("%s%s@@ -%ld,%ld +%ld,%ld @@%s\n",
973 prefix, c_frag,
974 p_start+1, p_end-p_start, t_start+1, t_end-t_start,
975 c_reset);
976 while (j < diff->target.nr && diff->target.ranges[j].start < t_end) {
977 int k;
978 for (; t_cur < diff->target.ranges[j].start; t_cur++)
979 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
980 c_plain, c_reset);
981 for (k = diff->parent.ranges[j].start; k < diff->parent.ranges[j].end; k++)
982 print_line(prefix, '-', k, p_ends, pair->one->data,
983 c_old, c_reset);
984 for (; t_cur < diff->target.ranges[j].end && t_cur < t_end; t_cur++)
985 print_line(prefix, '+', t_cur, t_ends, pair->two->data,
986 c_new, c_reset);
987 j++;
988 }
989 for (; t_cur < t_end; t_cur++)
990 print_line(prefix, ' ', t_cur, t_ends, pair->two->data,
991 c_plain, c_reset);
992 }
993
994 free(p_ends);
995 free(t_ends);
996 }
997
998 /*
999 * NEEDSWORK: manually building a diff here is not the Right
1000 * Thing(tm). log -L should be built into the diff pipeline.
1001 */
1002 static void dump_diff_hacky(struct rev_info *rev, struct line_log_data *range)
1003 {
1004 puts(output_prefix(&rev->diffopt));
1005 while (range) {
1006 dump_diff_hacky_one(rev, range);
1007 range = range->next;
1008 }
1009 }
1010
1011 /*
1012 * Unlike most other functions, this destructively operates on
1013 * 'range'.
1014 */
1015 static int process_diff_filepair(struct rev_info *rev,
1016 struct diff_filepair *pair,
1017 struct line_log_data *range,
1018 struct diff_ranges **diff_out)
1019 {
1020 struct line_log_data *rg = range;
1021 struct range_set tmp;
1022 struct diff_ranges diff;
1023 mmfile_t file_parent, file_target;
1024
1025 assert(pair->two->path);
1026 while (rg) {
1027 assert(rg->path);
1028 if (!strcmp(rg->path, pair->two->path))
1029 break;
1030 rg = rg->next;
1031 }
1032
1033 if (!rg)
1034 return 0;
1035 if (rg->ranges.nr == 0)
1036 return 0;
1037
1038 assert(pair->two->sha1_valid);
1039 diff_populate_filespec(pair->two, 0);
1040 file_target.ptr = pair->two->data;
1041 file_target.size = pair->two->size;
1042
1043 if (pair->one->sha1_valid) {
1044 diff_populate_filespec(pair->one, 0);
1045 file_parent.ptr = pair->one->data;
1046 file_parent.size = pair->one->size;
1047 } else {
1048 file_parent.ptr = "";
1049 file_parent.size = 0;
1050 }
1051
1052 diff_ranges_init(&diff);
1053 collect_diff(&file_parent, &file_target, &diff);
1054
1055 /* NEEDSWORK should apply some heuristics to prevent mismatches */
1056 free(rg->path);
1057 rg->path = xstrdup(pair->one->path);
1058
1059 range_set_init(&tmp, 0);
1060 range_set_map_across_diff(&tmp, &rg->ranges, &diff, diff_out);
1061 range_set_release(&rg->ranges);
1062 range_set_move(&rg->ranges, &tmp);
1063
1064 diff_ranges_release(&diff);
1065
1066 return ((*diff_out)->parent.nr > 0);
1067 }
1068
1069 static struct diff_filepair *diff_filepair_dup(struct diff_filepair *pair)
1070 {
1071 struct diff_filepair *new = xmalloc(sizeof(struct diff_filepair));
1072 new->one = pair->one;
1073 new->two = pair->two;
1074 new->one->count++;
1075 new->two->count++;
1076 return new;
1077 }
1078
1079 static void free_diffqueues(int n, struct diff_queue_struct *dq)
1080 {
1081 int i, j;
1082 for (i = 0; i < n; i++)
1083 for (j = 0; j < dq[i].nr; j++)
1084 diff_free_filepair(dq[i].queue[j]);
1085 free(dq);
1086 }
1087
1088 static int process_all_files(struct line_log_data **range_out,
1089 struct rev_info *rev,
1090 struct diff_queue_struct *queue,
1091 struct line_log_data *range)
1092 {
1093 int i, changed = 0;
1094
1095 *range_out = line_log_data_copy(range);
1096
1097 for (i = 0; i < queue->nr; i++) {
1098 struct diff_ranges *pairdiff = NULL;
1099 struct diff_filepair *pair = queue->queue[i];
1100 if (process_diff_filepair(rev, pair, *range_out, &pairdiff)) {
1101 /*
1102 * Store away the diff for later output. We
1103 * tuck it in the ranges we got as _input_,
1104 * since that's the commit that caused the
1105 * diff.
1106 *
1107 * NEEDSWORK not enough when we get around to
1108 * doing something interesting with merges;
1109 * currently each invocation on a merge parent
1110 * trashes the previous one's diff.
1111 *
1112 * NEEDSWORK tramples over data structures not owned here
1113 */
1114 struct line_log_data *rg = range;
1115 changed++;
1116 while (rg && strcmp(rg->path, pair->two->path))
1117 rg = rg->next;
1118 assert(rg);
1119 rg->pair = diff_filepair_dup(queue->queue[i]);
1120 memcpy(&rg->diff, pairdiff, sizeof(struct diff_ranges));
1121 }
1122 }
1123
1124 return changed;
1125 }
1126
1127 int line_log_print(struct rev_info *rev, struct commit *commit)
1128 {
1129 struct line_log_data *range = lookup_line_range(rev, commit);
1130
1131 show_log(rev);
1132 dump_diff_hacky(rev, range);
1133 return 1;
1134 }
1135
1136 static int process_ranges_ordinary_commit(struct rev_info *rev, struct commit *commit,
1137 struct line_log_data *range)
1138 {
1139 struct commit *parent = NULL;
1140 struct diff_queue_struct queue;
1141 struct line_log_data *parent_range;
1142 int changed;
1143
1144 if (commit->parents)
1145 parent = commit->parents->item;
1146
1147 queue_diffs(range, &rev->diffopt, &queue, commit, parent);
1148 changed = process_all_files(&parent_range, rev, &queue, range);
1149 if (parent)
1150 add_line_range(rev, parent, parent_range);
1151 return changed;
1152 }
1153
1154 static int process_ranges_merge_commit(struct rev_info *rev, struct commit *commit,
1155 struct line_log_data *range)
1156 {
1157 struct diff_queue_struct *diffqueues;
1158 struct line_log_data **cand;
1159 struct commit **parents;
1160 struct commit_list *p;
1161 int i;
1162 int nparents = count_parents(commit);
1163
1164 diffqueues = xmalloc(nparents * sizeof(*diffqueues));
1165 cand = xmalloc(nparents * sizeof(*cand));
1166 parents = xmalloc(nparents * sizeof(*parents));
1167
1168 p = commit->parents;
1169 for (i = 0; i < nparents; i++) {
1170 parents[i] = p->item;
1171 p = p->next;
1172 queue_diffs(range, &rev->diffopt, &diffqueues[i], commit, parents[i]);
1173 }
1174
1175 for (i = 0; i < nparents; i++) {
1176 int changed;
1177 cand[i] = NULL;
1178 changed = process_all_files(&cand[i], rev, &diffqueues[i], range);
1179 if (!changed) {
1180 /*
1181 * This parent can take all the blame, so we
1182 * don't follow any other path in history
1183 */
1184 add_line_range(rev, parents[i], cand[i]);
1185 clear_commit_line_range(rev, commit);
1186 commit->parents = xmalloc(sizeof(struct commit_list));
1187 commit->parents->item = parents[i];
1188 commit->parents->next = NULL;
1189 free(parents);
1190 free(cand);
1191 free_diffqueues(nparents, diffqueues);
1192 /* NEEDSWORK leaking like a sieve */
1193 return 0;
1194 }
1195 }
1196
1197 /*
1198 * No single parent took the blame. We add the candidates
1199 * from the above loop to the parents.
1200 */
1201 for (i = 0; i < nparents; i++) {
1202 add_line_range(rev, parents[i], cand[i]);
1203 }
1204
1205 clear_commit_line_range(rev, commit);
1206 free(parents);
1207 free(cand);
1208 free_diffqueues(nparents, diffqueues);
1209 return 1;
1210
1211 /* NEEDSWORK evil merge detection stuff */
1212 /* NEEDSWORK leaking like a sieve */
1213 }
1214
1215 static int process_ranges_arbitrary_commit(struct rev_info *rev, struct commit *commit)
1216 {
1217 struct line_log_data *range = lookup_line_range(rev, commit);
1218 int changed = 0;
1219
1220 if (range) {
1221 if (!commit->parents || !commit->parents->next)
1222 changed = process_ranges_ordinary_commit(rev, commit, range);
1223 else
1224 changed = process_ranges_merge_commit(rev, commit, range);
1225 }
1226
1227 if (!changed)
1228 commit->object.flags |= TREESAME;
1229
1230 return changed;
1231 }
1232
1233 static enum rewrite_result line_log_rewrite_one(struct rev_info *rev, struct commit **pp)
1234 {
1235 for (;;) {
1236 struct commit *p = *pp;
1237 if (p->parents && p->parents->next)
1238 return rewrite_one_ok;
1239 if (p->object.flags & UNINTERESTING)
1240 return rewrite_one_ok;
1241 if (!(p->object.flags & TREESAME))
1242 return rewrite_one_ok;
1243 if (!p->parents)
1244 return rewrite_one_noparents;
1245 *pp = p->parents->item;
1246 }
1247 }
1248
1249 int line_log_filter(struct rev_info *rev)
1250 {
1251 struct commit *commit;
1252 struct commit_list *list = rev->commits;
1253 struct commit_list *out = NULL, **pp = &out;
1254
1255 while (list) {
1256 struct commit_list *to_free = NULL;
1257 commit = list->item;
1258 if (process_ranges_arbitrary_commit(rev, commit)) {
1259 *pp = list;
1260 pp = &list->next;
1261 } else
1262 to_free = list;
1263 list = list->next;
1264 free(to_free);
1265 }
1266 *pp = NULL;
1267
1268 for (list = out; list; list = list->next)
1269 rewrite_parents(rev, list->item, line_log_rewrite_one);
1270
1271 rev->commits = out;
1272
1273 return 0;
1274 }
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