read-cache.c: use xcalloc() not calloc()
[git/git.git] / combine-diff.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "blob.h"
4 #include "diff.h"
5 #include "diffcore.h"
6 #include "quote.h"
7 #include "xdiff-interface.h"
8
9 static int uninteresting(struct diff_filepair *p)
10 {
11 if (diff_unmodified_pair(p))
12 return 1;
13 return 0;
14 }
15
16 static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
17 {
18 struct diff_queue_struct *q = &diff_queued_diff;
19 struct combine_diff_path *p;
20 int i;
21
22 if (!n) {
23 struct combine_diff_path *list = NULL, **tail = &list;
24 for (i = 0; i < q->nr; i++) {
25 int len;
26 const char *path;
27 if (uninteresting(q->queue[i]))
28 continue;
29 path = q->queue[i]->two->path;
30 len = strlen(path);
31 p = xmalloc(combine_diff_path_size(num_parent, len));
32 p->path = (char*) &(p->parent[num_parent]);
33 memcpy(p->path, path, len);
34 p->path[len] = 0;
35 p->len = len;
36 p->next = NULL;
37 memset(p->parent, 0,
38 sizeof(p->parent[0]) * num_parent);
39
40 memcpy(p->sha1, q->queue[i]->two->sha1, 20);
41 p->mode = q->queue[i]->two->mode;
42 memcpy(p->parent[n].sha1, q->queue[i]->one->sha1, 20);
43 p->parent[n].mode = q->queue[i]->one->mode;
44 p->parent[n].status = q->queue[i]->status;
45 *tail = p;
46 tail = &p->next;
47 }
48 return list;
49 }
50
51 for (p = curr; p; p = p->next) {
52 int found = 0;
53 if (!p->len)
54 continue;
55 for (i = 0; i < q->nr; i++) {
56 const char *path;
57 int len;
58
59 if (uninteresting(q->queue[i]))
60 continue;
61 path = q->queue[i]->two->path;
62 len = strlen(path);
63 if (len == p->len && !memcmp(path, p->path, len)) {
64 found = 1;
65 memcpy(p->parent[n].sha1,
66 q->queue[i]->one->sha1, 20);
67 p->parent[n].mode = q->queue[i]->one->mode;
68 p->parent[n].status = q->queue[i]->status;
69 break;
70 }
71 }
72 if (!found)
73 p->len = 0;
74 }
75 return curr;
76 }
77
78 /* Lines lost from parent */
79 struct lline {
80 struct lline *next;
81 int len;
82 unsigned long parent_map;
83 char line[FLEX_ARRAY];
84 };
85
86 /* Lines surviving in the merge result */
87 struct sline {
88 struct lline *lost_head, **lost_tail;
89 char *bol;
90 int len;
91 /* bit 0 up to (N-1) are on if the parent has this line (i.e.
92 * we did not change it).
93 * bit N is used for "interesting" lines, including context.
94 */
95 unsigned long flag;
96 unsigned long *p_lno;
97 };
98
99 static char *grab_blob(const unsigned char *sha1, unsigned long *size)
100 {
101 char *blob;
102 char type[20];
103 if (!memcmp(sha1, null_sha1, 20)) {
104 /* deleted blob */
105 *size = 0;
106 return xcalloc(1, 1);
107 }
108 blob = read_sha1_file(sha1, type, size);
109 if (strcmp(type, blob_type))
110 die("object '%s' is not a blob!", sha1_to_hex(sha1));
111 return blob;
112 }
113
114 static void append_lost(struct sline *sline, int n, const char *line, int len)
115 {
116 struct lline *lline;
117 unsigned long this_mask = (1UL<<n);
118 if (line[len-1] == '\n')
119 len--;
120
121 /* Check to see if we can squash things */
122 if (sline->lost_head) {
123 struct lline *last_one = NULL;
124 /* We cannot squash it with earlier one */
125 for (lline = sline->lost_head;
126 lline;
127 lline = lline->next)
128 if (lline->parent_map & this_mask)
129 last_one = lline;
130 lline = last_one ? last_one->next : sline->lost_head;
131 while (lline) {
132 if (lline->len == len &&
133 !memcmp(lline->line, line, len)) {
134 lline->parent_map |= this_mask;
135 return;
136 }
137 lline = lline->next;
138 }
139 }
140
141 lline = xmalloc(sizeof(*lline) + len + 1);
142 lline->len = len;
143 lline->next = NULL;
144 lline->parent_map = this_mask;
145 memcpy(lline->line, line, len);
146 lline->line[len] = 0;
147 *sline->lost_tail = lline;
148 sline->lost_tail = &lline->next;
149 }
150
151 struct combine_diff_state {
152 struct xdiff_emit_state xm;
153
154 unsigned int lno;
155 int ob, on, nb, nn;
156 unsigned long nmask;
157 int num_parent;
158 int n;
159 struct sline *sline;
160 struct sline *lost_bucket;
161 };
162
163 static void consume_line(void *state_, char *line, unsigned long len)
164 {
165 struct combine_diff_state *state = state_;
166 if (5 < len && !memcmp("@@ -", line, 4)) {
167 if (parse_hunk_header(line, len,
168 &state->ob, &state->on,
169 &state->nb, &state->nn))
170 return;
171 state->lno = state->nb;
172 if (!state->nb)
173 /* @@ -1,2 +0,0 @@ to remove the
174 * first two lines...
175 */
176 state->nb = 1;
177 if (state->nn == 0)
178 /* @@ -X,Y +N,0 @@ removed Y lines
179 * that would have come *after* line N
180 * in the result. Our lost buckets hang
181 * to the line after the removed lines,
182 */
183 state->lost_bucket = &state->sline[state->nb];
184 else
185 state->lost_bucket = &state->sline[state->nb-1];
186 if (!state->sline[state->nb-1].p_lno)
187 state->sline[state->nb-1].p_lno =
188 xcalloc(state->num_parent,
189 sizeof(unsigned long));
190 state->sline[state->nb-1].p_lno[state->n] = state->ob;
191 return;
192 }
193 if (!state->lost_bucket)
194 return; /* not in any hunk yet */
195 switch (line[0]) {
196 case '-':
197 append_lost(state->lost_bucket, state->n, line+1, len-1);
198 break;
199 case '+':
200 state->sline[state->lno-1].flag |= state->nmask;
201 state->lno++;
202 break;
203 }
204 }
205
206 static void combine_diff(const unsigned char *parent, mmfile_t *result_file,
207 struct sline *sline, int cnt, int n, int num_parent)
208 {
209 unsigned int p_lno, lno;
210 unsigned long nmask = (1UL << n);
211 xpparam_t xpp;
212 xdemitconf_t xecfg;
213 mmfile_t parent_file;
214 xdemitcb_t ecb;
215 struct combine_diff_state state;
216 unsigned long sz;
217
218 if (!cnt)
219 return; /* result deleted */
220
221 parent_file.ptr = grab_blob(parent, &sz);
222 parent_file.size = sz;
223 xpp.flags = XDF_NEED_MINIMAL;
224 xecfg.ctxlen = 0;
225 xecfg.flags = 0;
226 ecb.outf = xdiff_outf;
227 ecb.priv = &state;
228 memset(&state, 0, sizeof(state));
229 state.xm.consume = consume_line;
230 state.nmask = nmask;
231 state.sline = sline;
232 state.lno = 1;
233 state.num_parent = num_parent;
234 state.n = n;
235
236 xdl_diff(&parent_file, result_file, &xpp, &xecfg, &ecb);
237 free(parent_file.ptr);
238
239 /* Assign line numbers for this parent.
240 *
241 * sline[lno].p_lno[n] records the first line number
242 * (counting from 1) for parent N if the final hunk display
243 * started by showing sline[lno] (possibly showing the lost
244 * lines attached to it first).
245 */
246 for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
247 struct lline *ll;
248 sline[lno].p_lno[n] = p_lno;
249
250 /* How many lines would this sline advance the p_lno? */
251 ll = sline[lno].lost_head;
252 while (ll) {
253 if (ll->parent_map & nmask)
254 p_lno++; /* '-' means parent had it */
255 ll = ll->next;
256 }
257 if (lno < cnt && !(sline[lno].flag & nmask))
258 p_lno++; /* no '+' means parent had it */
259 }
260 sline[lno].p_lno[n] = p_lno; /* trailer */
261 }
262
263 static unsigned long context = 3;
264 static char combine_marker = '@';
265
266 static int interesting(struct sline *sline, unsigned long all_mask)
267 {
268 /* If some parents lost lines here, or if we have added to
269 * some parent, it is interesting.
270 */
271 return ((sline->flag & all_mask) || sline->lost_head);
272 }
273
274 static unsigned long adjust_hunk_tail(struct sline *sline,
275 unsigned long all_mask,
276 unsigned long hunk_begin,
277 unsigned long i)
278 {
279 /* i points at the first uninteresting line. If the last line
280 * of the hunk was interesting only because it has some
281 * deletion, then it is not all that interesting for the
282 * purpose of giving trailing context lines. This is because
283 * we output '-' line and then unmodified sline[i-1] itself in
284 * that case which gives us one extra context line.
285 */
286 if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
287 i--;
288 return i;
289 }
290
291 static unsigned long find_next(struct sline *sline,
292 unsigned long mark,
293 unsigned long i,
294 unsigned long cnt,
295 int uninteresting)
296 {
297 /* We have examined up to i-1 and are about to look at i.
298 * Find next interesting or uninteresting line. Here,
299 * "interesting" does not mean interesting(), but marked by
300 * the give_context() function below (i.e. it includes context
301 * lines that are not interesting to interesting() function
302 * that are surrounded by interesting() ones.
303 */
304 while (i <= cnt)
305 if (uninteresting
306 ? !(sline[i].flag & mark)
307 : (sline[i].flag & mark))
308 return i;
309 else
310 i++;
311 return i;
312 }
313
314 static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
315 {
316 unsigned long all_mask = (1UL<<num_parent) - 1;
317 unsigned long mark = (1UL<<num_parent);
318 unsigned long i;
319
320 /* Two groups of interesting lines may have a short gap of
321 * unintersting lines. Connect such groups to give them a
322 * bit of context.
323 *
324 * We first start from what the interesting() function says,
325 * and mark them with "mark", and paint context lines with the
326 * mark. So interesting() would still say false for such context
327 * lines but they are treated as "interesting" in the end.
328 */
329 i = find_next(sline, mark, 0, cnt, 0);
330 if (cnt < i)
331 return 0;
332
333 while (i <= cnt) {
334 unsigned long j = (context < i) ? (i - context) : 0;
335 unsigned long k;
336
337 /* Paint a few lines before the first interesting line. */
338 while (j < i)
339 sline[j++].flag |= mark;
340
341 again:
342 /* we know up to i is to be included. where does the
343 * next uninteresting one start?
344 */
345 j = find_next(sline, mark, i, cnt, 1);
346 if (cnt < j)
347 break; /* the rest are all interesting */
348
349 /* lookahead context lines */
350 k = find_next(sline, mark, j, cnt, 0);
351 j = adjust_hunk_tail(sline, all_mask, i, j);
352
353 if (k < j + context) {
354 /* k is interesting and [j,k) are not, but
355 * paint them interesting because the gap is small.
356 */
357 while (j < k)
358 sline[j++].flag |= mark;
359 i = k;
360 goto again;
361 }
362
363 /* j is the first uninteresting line and there is
364 * no overlap beyond it within context lines. Paint
365 * the trailing edge a bit.
366 */
367 i = k;
368 k = (j + context < cnt+1) ? j + context : cnt+1;
369 while (j < k)
370 sline[j++].flag |= mark;
371 }
372 return 1;
373 }
374
375 static int make_hunks(struct sline *sline, unsigned long cnt,
376 int num_parent, int dense)
377 {
378 unsigned long all_mask = (1UL<<num_parent) - 1;
379 unsigned long mark = (1UL<<num_parent);
380 unsigned long i;
381 int has_interesting = 0;
382
383 for (i = 0; i <= cnt; i++) {
384 if (interesting(&sline[i], all_mask))
385 sline[i].flag |= mark;
386 else
387 sline[i].flag &= ~mark;
388 }
389 if (!dense)
390 return give_context(sline, cnt, num_parent);
391
392 /* Look at each hunk, and if we have changes from only one
393 * parent, or the changes are the same from all but one
394 * parent, mark that uninteresting.
395 */
396 i = 0;
397 while (i <= cnt) {
398 unsigned long j, hunk_begin, hunk_end;
399 unsigned long same_diff;
400 while (i <= cnt && !(sline[i].flag & mark))
401 i++;
402 if (cnt < i)
403 break; /* No more interesting hunks */
404 hunk_begin = i;
405 for (j = i + 1; j <= cnt; j++) {
406 if (!(sline[j].flag & mark)) {
407 /* Look beyond the end to see if there
408 * is an interesting line after this
409 * hunk within context span.
410 */
411 unsigned long la; /* lookahead */
412 int contin = 0;
413 la = adjust_hunk_tail(sline, all_mask,
414 hunk_begin, j);
415 la = (la + context < cnt + 1) ?
416 (la + context) : cnt + 1;
417 while (j <= --la) {
418 if (sline[la].flag & mark) {
419 contin = 1;
420 break;
421 }
422 }
423 if (!contin)
424 break;
425 j = la;
426 }
427 }
428 hunk_end = j;
429
430 /* [i..hunk_end) are interesting. Now is it really
431 * interesting? We check if there are only two versions
432 * and the result matches one of them. That is, we look
433 * at:
434 * (+) line, which records lines added to which parents;
435 * this line appears in the result.
436 * (-) line, which records from what parents the line
437 * was removed; this line does not appear in the result.
438 * then check the set of parents the result has difference
439 * from, from all lines. If there are lines that has
440 * different set of parents that the result has differences
441 * from, that means we have more than two versions.
442 *
443 * Even when we have only two versions, if the result does
444 * not match any of the parents, the it should be considered
445 * interesting. In such a case, we would have all '+' line.
446 * After passing the above "two versions" test, that would
447 * appear as "the same set of parents" to be "all parents".
448 */
449 same_diff = 0;
450 has_interesting = 0;
451 for (j = i; j < hunk_end && !has_interesting; j++) {
452 unsigned long this_diff = sline[j].flag & all_mask;
453 struct lline *ll = sline[j].lost_head;
454 if (this_diff) {
455 /* This has some changes. Is it the
456 * same as others?
457 */
458 if (!same_diff)
459 same_diff = this_diff;
460 else if (same_diff != this_diff) {
461 has_interesting = 1;
462 break;
463 }
464 }
465 while (ll && !has_interesting) {
466 /* Lost this line from these parents;
467 * who are they? Are they the same?
468 */
469 this_diff = ll->parent_map;
470 if (!same_diff)
471 same_diff = this_diff;
472 else if (same_diff != this_diff) {
473 has_interesting = 1;
474 }
475 ll = ll->next;
476 }
477 }
478
479 if (!has_interesting && same_diff != all_mask) {
480 /* This hunk is not that interesting after all */
481 for (j = hunk_begin; j < hunk_end; j++)
482 sline[j].flag &= ~mark;
483 }
484 i = hunk_end;
485 }
486
487 has_interesting = give_context(sline, cnt, num_parent);
488 return has_interesting;
489 }
490
491 static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, unsigned long cnt, int n)
492 {
493 l0 = sline[l0].p_lno[n];
494 l1 = sline[l1].p_lno[n];
495 printf(" -%lu,%lu", l0, l1-l0);
496 }
497
498 static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent)
499 {
500 unsigned long mark = (1UL<<num_parent);
501 int i;
502 unsigned long lno = 0;
503
504 if (!cnt)
505 return; /* result deleted */
506
507 while (1) {
508 struct sline *sl = &sline[lno];
509 unsigned long hunk_end;
510 unsigned long rlines;
511 while (lno <= cnt && !(sline[lno].flag & mark))
512 lno++;
513 if (cnt < lno)
514 break;
515 else {
516 for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
517 if (!(sline[hunk_end].flag & mark))
518 break;
519 }
520 rlines = hunk_end - lno;
521 if (cnt < hunk_end)
522 rlines--; /* pointing at the last delete hunk */
523 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
524 for (i = 0; i < num_parent; i++)
525 show_parent_lno(sline, lno, hunk_end, cnt, i);
526 printf(" +%lu,%lu ", lno+1, rlines);
527 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
528 putchar('\n');
529 while (lno < hunk_end) {
530 struct lline *ll;
531 int j;
532 unsigned long p_mask;
533 sl = &sline[lno++];
534 ll = sl->lost_head;
535 while (ll) {
536 for (j = 0; j < num_parent; j++) {
537 if (ll->parent_map & (1UL<<j))
538 putchar('-');
539 else
540 putchar(' ');
541 }
542 puts(ll->line);
543 ll = ll->next;
544 }
545 if (cnt < lno)
546 break;
547 p_mask = 1;
548 for (j = 0; j < num_parent; j++) {
549 if (p_mask & sl->flag)
550 putchar('+');
551 else
552 putchar(' ');
553 p_mask <<= 1;
554 }
555 printf("%.*s\n", sl->len, sl->bol);
556 }
557 }
558 }
559
560 static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
561 int i, int j)
562 {
563 /* We have already examined parent j and we know parent i
564 * and parent j are the same, so reuse the combined result
565 * of parent j for parent i.
566 */
567 unsigned long lno, imask, jmask;
568 imask = (1UL<<i);
569 jmask = (1UL<<j);
570
571 for (lno = 0; lno <= cnt; lno++) {
572 struct lline *ll = sline->lost_head;
573 sline->p_lno[i] = sline->p_lno[j];
574 while (ll) {
575 if (ll->parent_map & jmask)
576 ll->parent_map |= imask;
577 ll = ll->next;
578 }
579 if (sline->flag & jmask)
580 sline->flag |= imask;
581 sline++;
582 }
583 /* the overall size of the file (sline[cnt]) */
584 sline->p_lno[i] = sline->p_lno[j];
585 }
586
587 static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
588 int dense, const char *header,
589 struct diff_options *opt)
590 {
591 unsigned long result_size, cnt, lno;
592 char *result, *cp;
593 struct sline *sline; /* survived lines */
594 int mode_differs = 0;
595 int i, show_hunks, shown_header = 0;
596 int working_tree_file = !memcmp(elem->sha1, null_sha1, 20);
597 int abbrev = opt->full_index ? 40 : DEFAULT_ABBREV;
598 mmfile_t result_file;
599
600 /* Read the result of merge first */
601 if (!working_tree_file)
602 result = grab_blob(elem->sha1, &result_size);
603 else {
604 /* Used by diff-tree to read from the working tree */
605 struct stat st;
606 int fd;
607 if (0 <= (fd = open(elem->path, O_RDONLY)) &&
608 !fstat(fd, &st)) {
609 int len = st.st_size;
610 int cnt = 0;
611
612 elem->mode = canon_mode(st.st_mode);
613 result_size = len;
614 result = xmalloc(len + 1);
615 while (cnt < len) {
616 int done = xread(fd, result+cnt, len-cnt);
617 if (done == 0)
618 break;
619 if (done < 0)
620 die("read error '%s'", elem->path);
621 cnt += done;
622 }
623 result[len] = 0;
624 }
625 else {
626 /* deleted file */
627 result_size = 0;
628 elem->mode = 0;
629 result = xmalloc(1);
630 result[0] = 0;
631 }
632 if (0 <= fd)
633 close(fd);
634 }
635
636 for (cnt = 0, cp = result; cp - result < result_size; cp++) {
637 if (*cp == '\n')
638 cnt++;
639 }
640 if (result_size && result[result_size-1] != '\n')
641 cnt++; /* incomplete line */
642
643 sline = xcalloc(cnt+2, sizeof(*sline));
644 sline[0].bol = result;
645 for (lno = 0; lno <= cnt + 1; lno++) {
646 sline[lno].lost_tail = &sline[lno].lost_head;
647 sline[lno].flag = 0;
648 }
649 for (lno = 0, cp = result; cp - result < result_size; cp++) {
650 if (*cp == '\n') {
651 sline[lno].len = cp - sline[lno].bol;
652 lno++;
653 if (lno < cnt)
654 sline[lno].bol = cp + 1;
655 }
656 }
657 if (result_size && result[result_size-1] != '\n')
658 sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
659
660 result_file.ptr = result;
661 result_file.size = result_size;
662
663 /* Even p_lno[cnt+1] is valid -- that is for the end line number
664 * for deletion hunk at the end.
665 */
666 sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
667 for (lno = 0; lno <= cnt; lno++)
668 sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
669
670 for (i = 0; i < num_parent; i++) {
671 int j;
672 for (j = 0; j < i; j++) {
673 if (!memcmp(elem->parent[i].sha1,
674 elem->parent[j].sha1, 20)) {
675 reuse_combine_diff(sline, cnt, i, j);
676 break;
677 }
678 }
679 if (i <= j)
680 combine_diff(elem->parent[i].sha1, &result_file, sline,
681 cnt, i, num_parent);
682 if (elem->parent[i].mode != elem->mode)
683 mode_differs = 1;
684 }
685
686 show_hunks = make_hunks(sline, cnt, num_parent, dense);
687
688 if (show_hunks || mode_differs || working_tree_file) {
689 const char *abb;
690
691 if (header) {
692 shown_header++;
693 printf("%s%c", header, opt->line_termination);
694 }
695 printf("diff --%s ", dense ? "cc" : "combined");
696 if (quote_c_style(elem->path, NULL, NULL, 0))
697 quote_c_style(elem->path, NULL, stdout, 0);
698 else
699 printf("%s", elem->path);
700 putchar('\n');
701 printf("index ");
702 for (i = 0; i < num_parent; i++) {
703 abb = find_unique_abbrev(elem->parent[i].sha1,
704 abbrev);
705 printf("%s%s", i ? "," : "", abb);
706 }
707 abb = find_unique_abbrev(elem->sha1, abbrev);
708 printf("..%s\n", abb);
709
710 if (mode_differs) {
711 int added = !!elem->mode;
712 for (i = 0; added && i < num_parent; i++)
713 if (elem->parent[i].status !=
714 DIFF_STATUS_ADDED)
715 added = 0;
716 if (added)
717 printf("new file mode %06o", elem->mode);
718 else {
719 if (!elem->mode)
720 printf("deleted file ");
721 printf("mode ");
722 for (i = 0; i < num_parent; i++) {
723 printf("%s%06o", i ? "," : "",
724 elem->parent[i].mode);
725 }
726 if (elem->mode)
727 printf("..%06o", elem->mode);
728 }
729 putchar('\n');
730 }
731 dump_sline(sline, cnt, num_parent);
732 }
733 free(result);
734
735 for (i = 0; i < cnt; i++) {
736 if (sline[i].lost_head) {
737 struct lline *ll = sline[i].lost_head;
738 while (ll) {
739 struct lline *tmp = ll;
740 ll = ll->next;
741 free(tmp);
742 }
743 }
744 }
745 free(sline[0].p_lno);
746 free(sline);
747 return shown_header;
748 }
749
750 #define COLONS "::::::::::::::::::::::::::::::::"
751
752 static void show_raw_diff(struct combine_diff_path *p, int num_parent, const char *header, struct diff_options *opt)
753 {
754 int i, offset;
755 const char *prefix;
756 int line_termination, inter_name_termination;
757
758 line_termination = opt->line_termination;
759 inter_name_termination = '\t';
760 if (!line_termination)
761 inter_name_termination = 0;
762
763 if (header)
764 printf("%s%c", header, line_termination);
765
766 if (opt->output_format == DIFF_FORMAT_RAW) {
767 offset = strlen(COLONS) - num_parent;
768 if (offset < 0)
769 offset = 0;
770 prefix = COLONS + offset;
771
772 /* Show the modes */
773 for (i = 0; i < num_parent; i++) {
774 printf("%s%06o", prefix, p->parent[i].mode);
775 prefix = " ";
776 }
777 printf("%s%06o", prefix, p->mode);
778
779 /* Show sha1's */
780 for (i = 0; i < num_parent; i++)
781 printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
782 opt->abbrev));
783 printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
784 }
785
786 if (opt->output_format == DIFF_FORMAT_RAW ||
787 opt->output_format == DIFF_FORMAT_NAME_STATUS) {
788 for (i = 0; i < num_parent; i++)
789 putchar(p->parent[i].status);
790 putchar(inter_name_termination);
791 }
792
793 if (line_termination) {
794 if (quote_c_style(p->path, NULL, NULL, 0))
795 quote_c_style(p->path, NULL, stdout, 0);
796 else
797 printf("%s", p->path);
798 putchar(line_termination);
799 }
800 else {
801 printf("%s%c", p->path, line_termination);
802 }
803 }
804
805 int show_combined_diff(struct combine_diff_path *p,
806 int num_parent,
807 int dense,
808 const char *header,
809 struct diff_options *opt)
810 {
811 if (!p->len)
812 return 0;
813 switch (opt->output_format) {
814 case DIFF_FORMAT_RAW:
815 case DIFF_FORMAT_NAME_STATUS:
816 case DIFF_FORMAT_NAME:
817 show_raw_diff(p, num_parent, header, opt);
818 return 1;
819
820 default:
821 case DIFF_FORMAT_PATCH:
822 return show_patch_diff(p, num_parent, dense, header, opt);
823 }
824 }
825
826 const char *diff_tree_combined_merge(const unsigned char *sha1,
827 const char *header, int dense,
828 struct diff_options *opt)
829 {
830 struct commit *commit = lookup_commit(sha1);
831 struct diff_options diffopts;
832 struct commit_list *parents;
833 struct combine_diff_path *p, *paths = NULL;
834 int num_parent, i, num_paths;
835
836 diffopts = *opt;
837 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
838 diffopts.with_raw = 0;
839 diffopts.recursive = 1;
840
841 /* count parents */
842 for (parents = commit->parents, num_parent = 0;
843 parents;
844 parents = parents->next, num_parent++)
845 ; /* nothing */
846
847 /* find set of paths that everybody touches */
848 for (parents = commit->parents, i = 0;
849 parents;
850 parents = parents->next, i++) {
851 struct commit *parent = parents->item;
852 diff_tree_sha1(parent->object.sha1, commit->object.sha1, "",
853 &diffopts);
854 diffcore_std(&diffopts);
855 paths = intersect_paths(paths, i, num_parent);
856 diff_flush(&diffopts);
857 }
858
859 /* find out surviving paths */
860 for (num_paths = 0, p = paths; p; p = p->next) {
861 if (p->len)
862 num_paths++;
863 }
864 if (num_paths) {
865 if (opt->with_raw) {
866 int saved_format = opt->output_format;
867 opt->output_format = DIFF_FORMAT_RAW;
868 for (p = paths; p; p = p->next) {
869 if (show_combined_diff(p, num_parent, dense,
870 header, opt))
871 header = NULL;
872 }
873 opt->output_format = saved_format;
874 putchar(opt->line_termination);
875 }
876 for (p = paths; p; p = p->next) {
877 if (show_combined_diff(p, num_parent, dense,
878 header, opt))
879 header = NULL;
880 }
881 }
882
883 /* Clean things up */
884 while (paths) {
885 struct combine_diff_path *tmp = paths;
886 paths = paths->next;
887 free(tmp);
888 }
889 return header;
890 }