1#include "cache.h"
2#include "commit.h"
3#include "diff.h"
4#include "diffcore.h"
5#include "quote.h"
6static int uninteresting(struct diff_filepair *p)
8{
9 if (diff_unmodified_pair(p))
10 return 1;
11 return 0;
12}
13static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
15{
16 struct diff_queue_struct *q = &diff_queued_diff;
17 struct combine_diff_path *p;
18 int i;
19 if (!n) {
21 struct combine_diff_path *list = NULL, **tail = &list;
22 for (i = 0; i < q->nr; i++) {
23 int len;
24 const char *path;
25 if (uninteresting(q->queue[i]))
26 continue;
27 path = q->queue[i]->two->path;
28 len = strlen(path);
29 p = xmalloc(combine_diff_path_size(num_parent, len));
30 p->path = (char*) &(p->parent[num_parent]);
31 memcpy(p->path, path, len);
32 p->path[len] = 0;
33 p->len = len;
34 p->next = NULL;
35 memset(p->parent, 0,
36 sizeof(p->parent[0]) * num_parent);
37 memcpy(p->sha1, q->queue[i]->two->sha1, 20);
39 p->mode = q->queue[i]->two->mode;
40 memcpy(p->parent[n].sha1, q->queue[i]->one->sha1, 20);
41 p->parent[n].mode = q->queue[i]->one->mode;
42 p->parent[n].status = q->queue[i]->status;
43 *tail = p;
44 tail = &p->next;
45 }
46 return list;
47 }
48 for (p = curr; p; p = p->next) {
50 int found = 0;
51 if (!p->len)
52 continue;
53 for (i = 0; i < q->nr; i++) {
54 const char *path;
55 int len;
56 if (uninteresting(q->queue[i]))
58 continue;
59 path = q->queue[i]->two->path;
60 len = strlen(path);
61 if (len == p->len && !memcmp(path, p->path, len)) {
62 found = 1;
63 memcpy(p->parent[n].sha1,
64 q->queue[i]->one->sha1, 20);
65 p->parent[n].mode = q->queue[i]->one->mode;
66 p->parent[n].status = q->queue[i]->status;
67 break;
68 }
69 }
70 if (!found)
71 p->len = 0;
72 }
73 return curr;
74}
75/* Lines lost from parent */
77struct lline {
78 struct lline *next;
79 int len;
80 unsigned long parent_map;
81 char line[FLEX_ARRAY];
82};
83/* Lines surviving in the merge result */
85struct sline {
86 struct lline *lost_head, **lost_tail;
87 char *bol;
88 int len;
89 /* bit 0 up to (N-1) are on if the parent has this line (i.e.
90 * we did not change it).
91 * bit N is used for "interesting" lines, including context.
92 */
93 unsigned long flag;
94 unsigned long *p_lno;
95};
96static char *grab_blob(const unsigned char *sha1, unsigned long *size)
98{
99 char *blob;
100 char type[20];
101 if (!memcmp(sha1, null_sha1, 20)) {
102 /* deleted blob */
103 *size = 0;
104 return xcalloc(1, 1);
105 }
106 blob = read_sha1_file(sha1, type, size);
107 if (strcmp(type, "blob"))
108 die("object '%s' is not a blob!", sha1_to_hex(sha1));
109 return blob;
110}
111#define TMPPATHLEN 50
113#define MAXLINELEN 10240
114static void write_to_temp_file(char *tmpfile, void *blob, unsigned long size)
116{
117 int fd = git_mkstemp(tmpfile, TMPPATHLEN, ".diff_XXXXXX");
118 if (fd < 0)
119 die("unable to create temp-file");
120 if (write(fd, blob, size) != size)
121 die("unable to write temp-file");
122 close(fd);
123}
124static void write_temp_blob(char *tmpfile, const unsigned char *sha1)
126{
127 unsigned long size;
128 void *blob;
129 blob = grab_blob(sha1, &size);
130 write_to_temp_file(tmpfile, blob, size);
131 free(blob);
132}
133static int parse_num(char **cp_p, unsigned int *num_p)
135{
136 char *cp = *cp_p;
137 unsigned int num = 0;
138 int read_some;
139 while ('0' <= *cp && *cp <= '9')
141 num = num * 10 + *cp++ - '0';
142 if (!(read_some = cp - *cp_p))
143 return -1;
144 *cp_p = cp;
145 *num_p = num;
146 return 0;
147}
148static int parse_hunk_header(char *line, int len,
150 unsigned int *ob, unsigned int *on,
151 unsigned int *nb, unsigned int *nn)
152{
153 char *cp;
154 cp = line + 4;
155 if (parse_num(&cp, ob)) {
156 bad_line:
157 return error("malformed diff output: %s", line);
158 }
159 if (*cp == ',') {
160 cp++;
161 if (parse_num(&cp, on))
162 goto bad_line;
163 }
164 else
165 *on = 1;
166 if (*cp++ != ' ' || *cp++ != '+')
167 goto bad_line;
168 if (parse_num(&cp, nb))
169 goto bad_line;
170 if (*cp == ',') {
171 cp++;
172 if (parse_num(&cp, nn))
173 goto bad_line;
174 }
175 else
176 *nn = 1;
177 return -!!memcmp(cp, " @@", 3);
178}
179static void append_lost(struct sline *sline, int n, const char *line)
181{
182 struct lline *lline;
183 int len = strlen(line);
184 unsigned long this_mask = (1UL<<n);
185 if (line[len-1] == '\n')
186 len--;
187 /* Check to see if we can squash things */
189 if (sline->lost_head) {
190 struct lline *last_one = NULL;
191 /* We cannot squash it with earlier one */
192 for (lline = sline->lost_head;
193 lline;
194 lline = lline->next)
195 if (lline->parent_map & this_mask)
196 last_one = lline;
197 lline = last_one ? last_one->next : sline->lost_head;
198 while (lline) {
199 if (lline->len == len &&
200 !memcmp(lline->line, line, len)) {
201 lline->parent_map |= this_mask;
202 return;
203 }
204 lline = lline->next;
205 }
206 }
207 lline = xmalloc(sizeof(*lline) + len + 1);
209 lline->len = len;
210 lline->next = NULL;
211 lline->parent_map = this_mask;
212 memcpy(lline->line, line, len);
213 lline->line[len] = 0;
214 *sline->lost_tail = lline;
215 sline->lost_tail = &lline->next;
216}
217static void combine_diff(const unsigned char *parent, const char *ourtmp,
219 struct sline *sline, int cnt, int n, int num_parent)
220{
221 FILE *in;
222 char parent_tmp[TMPPATHLEN];
223 char cmd[TMPPATHLEN * 2 + 1024];
224 char line[MAXLINELEN];
225 unsigned int lno, ob, on, nb, nn, p_lno;
226 unsigned long nmask = (1UL << n);
227 struct sline *lost_bucket = NULL;
228 if (!cnt)
230 return; /* result deleted */
231 write_temp_blob(parent_tmp, parent);
233 sprintf(cmd, "diff --unified=0 -La/x -Lb/x '%s' '%s'",
234 parent_tmp, ourtmp);
235 in = popen(cmd, "r");
236 if (!in)
237 die("cannot spawn %s", cmd);
238 lno = 1;
240 while (fgets(line, sizeof(line), in) != NULL) {
241 int len = strlen(line);
242 if (5 < len && !memcmp("@@ -", line, 4)) {
243 if (parse_hunk_header(line, len,
244 &ob, &on, &nb, &nn))
245 break;
246 lno = nb;
247 if (!nb)
248 /* @@ -1,2 +0,0 @@ to remove the
249 * first two lines...
250 */
251 nb = 1;
252 if (nn == 0)
253 /* @@ -X,Y +N,0 @@ removed Y lines
254 * that would have come *after* line N
255 * in the result. Our lost buckets hang
256 * to the line after the removed lines,
257 */
258 lost_bucket = &sline[nb];
259 else
260 lost_bucket = &sline[nb-1];
261 if (!sline[nb-1].p_lno)
262 sline[nb-1].p_lno =
263 xcalloc(num_parent,
264 sizeof(unsigned long));
265 sline[nb-1].p_lno[n] = ob;
266 continue;
267 }
268 if (!lost_bucket)
269 continue; /* not in any hunk yet */
270 switch (line[0]) {
271 case '-':
272 append_lost(lost_bucket, n, line+1);
273 break;
274 case '+':
275 sline[lno-1].flag |= nmask;
276 lno++;
277 break;
278 }
279 }
280 fclose(in);
281 unlink(parent_tmp);
282 /* Assign line numbers for this parent.
284 *
285 * sline[lno].p_lno[n] records the first line number
286 * (counting from 1) for parent N if the final hunk display
287 * started by showing sline[lno] (possibly showing the lost
288 * lines attached to it first).
289 */
290 for (lno = 0, p_lno = 1; lno < cnt; lno++) {
291 struct lline *ll;
292 sline[lno].p_lno[n] = p_lno;
293 /* How many lines would this sline advance the p_lno? */
295 ll = sline[lno].lost_head;
296 while (ll) {
297 if (ll->parent_map & nmask)
298 p_lno++; /* '-' means parent had it */
299 ll = ll->next;
300 }
301 if (!(sline[lno].flag & nmask))
302 p_lno++; /* no '+' means parent had it */
303 }
304 sline[lno].p_lno[n] = p_lno; /* trailer */
305}
306static unsigned long context = 3;
308static char combine_marker = '@';
309static int interesting(struct sline *sline, unsigned long all_mask)
311{
312 /* If some parents lost lines here, or if we have added to
313 * some parent, it is interesting.
314 */
315 return ((sline->flag & all_mask) || sline->lost_head);
316}
317static unsigned long adjust_hunk_tail(struct sline *sline,
319 unsigned long all_mask,
320 unsigned long hunk_begin,
321 unsigned long i)
322{
323 /* i points at the first uninteresting line. If the last line
324 * of the hunk was interesting only because it has some
325 * deletion, then it is not all that interesting for the
326 * purpose of giving trailing context lines. This is because
327 * we output '-' line and then unmodified sline[i-1] itself in
328 * that case which gives us one extra context line.
329 */
330 if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
331 i--;
332 return i;
333}
334static unsigned long find_next(struct sline *sline,
336 unsigned long mark,
337 unsigned long i,
338 unsigned long cnt,
339 int uninteresting)
340{
341 /* We have examined up to i-1 and are about to look at i.
342 * Find next interesting or uninteresting line. Here,
343 * "interesting" does not mean interesting(), but marked by
344 * the give_context() function below (i.e. it includes context
345 * lines that are not interesting to interesting() function
346 * that are surrounded by interesting() ones.
347 */
348 while (i < cnt)
349 if (uninteresting
350 ? !(sline[i].flag & mark)
351 : (sline[i].flag & mark))
352 return i;
353 else
354 i++;
355 return cnt;
356}
357static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
359{
360 unsigned long all_mask = (1UL<<num_parent) - 1;
361 unsigned long mark = (1UL<<num_parent);
362 unsigned long i;
363 /* Two groups of interesting lines may have a short gap of
365 * unintersting lines. Connect such groups to give them a
366 * bit of context.
367 *
368 * We first start from what the interesting() function says,
369 * and mark them with "mark", and paint context lines with the
370 * mark. So interesting() would still say false for such context
371 * lines but they are treated as "interesting" in the end.
372 */
373 i = find_next(sline, mark, 0, cnt, 0);
374 if (cnt <= i)
375 return 0;
376 while (i < cnt) {
378 unsigned long j = (context < i) ? (i - context) : 0;
379 unsigned long k;
380 /* Paint a few lines before the first interesting line. */
382 while (j < i)
383 sline[j++].flag |= mark;
384 again:
386 /* we know up to i is to be included. where does the
387 * next uninteresting one start?
388 */
389 j = find_next(sline, mark, i, cnt, 1);
390 if (cnt <= j)
391 break; /* the rest are all interesting */
392 /* lookahead context lines */
394 k = find_next(sline, mark, j, cnt, 0);
395 j = adjust_hunk_tail(sline, all_mask, i, j);
396 if (k < j + context) {
398 /* k is interesting and [j,k) are not, but
399 * paint them interesting because the gap is small.
400 */
401 while (j < k)
402 sline[j++].flag |= mark;
403 i = k;
404 goto again;
405 }
406 /* j is the first uninteresting line and there is
408 * no overlap beyond it within context lines. Paint
409 * the trailing edge a bit.
410 */
411 i = k;
412 k = (j + context < cnt) ? j + context : cnt;
413 while (j < k)
414 sline[j++].flag |= mark;
415 }
416 return 1;
417}
418static int make_hunks(struct sline *sline, unsigned long cnt,
420 int num_parent, int dense)
421{
422 unsigned long all_mask = (1UL<<num_parent) - 1;
423 unsigned long mark = (1UL<<num_parent);
424 unsigned long i;
425 int has_interesting = 0;
426 for (i = 0; i < cnt; i++) {
428 if (interesting(&sline[i], all_mask))
429 sline[i].flag |= mark;
430 else
431 sline[i].flag &= ~mark;
432 }
433 if (!dense)
434 return give_context(sline, cnt, num_parent);
435 /* Look at each hunk, and if we have changes from only one
437 * parent, or the changes are the same from all but one
438 * parent, mark that uninteresting.
439 */
440 i = 0;
441 while (i < cnt) {
442 unsigned long j, hunk_begin, hunk_end;
443 unsigned long same_diff;
444 while (i < cnt && !(sline[i].flag & mark))
445 i++;
446 if (cnt <= i)
447 break; /* No more interesting hunks */
448 hunk_begin = i;
449 for (j = i + 1; j < cnt; j++) {
450 if (!(sline[j].flag & mark)) {
451 /* Look beyond the end to see if there
452 * is an interesting line after this
453 * hunk within context span.
454 */
455 unsigned long la; /* lookahead */
456 int contin = 0;
457 la = adjust_hunk_tail(sline, all_mask,
458 hunk_begin, j);
459 la = (la + context < cnt) ?
460 (la + context) : cnt;
461 while (j <= --la) {
462 if (sline[la].flag & mark) {
463 contin = 1;
464 break;
465 }
466 }
467 if (!contin)
468 break;
469 j = la;
470 }
471 }
472 hunk_end = j;
473 /* [i..hunk_end) are interesting. Now is it really
475 * interesting? We check if there are only two versions
476 * and the result matches one of them. That is, we look
477 * at:
478 * (+) line, which records lines added to which parents;
479 * this line appears in the result.
480 * (-) line, which records from what parents the line
481 * was removed; this line does not appear in the result.
482 * then check the set of parents the result has difference
483 * from, from all lines. If there are lines that has
484 * different set of parents that the result has differences
485 * from, that means we have more than two versions.
486 *
487 * Even when we have only two versions, if the result does
488 * not match any of the parents, the it should be considered
489 * interesting. In such a case, we would have all '+' line.
490 * After passing the above "two versions" test, that would
491 * appear as "the same set of parents" to be "all parents".
492 */
493 same_diff = 0;
494 has_interesting = 0;
495 for (j = i; j < hunk_end && !has_interesting; j++) {
496 unsigned long this_diff = sline[j].flag & all_mask;
497 struct lline *ll = sline[j].lost_head;
498 if (this_diff) {
499 /* This has some changes. Is it the
500 * same as others?
501 */
502 if (!same_diff)
503 same_diff = this_diff;
504 else if (same_diff != this_diff) {
505 has_interesting = 1;
506 break;
507 }
508 }
509 while (ll && !has_interesting) {
510 /* Lost this line from these parents;
511 * who are they? Are they the same?
512 */
513 this_diff = ll->parent_map;
514 if (!same_diff)
515 same_diff = this_diff;
516 else if (same_diff != this_diff) {
517 has_interesting = 1;
518 }
519 ll = ll->next;
520 }
521 }
522 if (!has_interesting && same_diff != all_mask) {
524 /* This hunk is not that interesting after all */
525 for (j = hunk_begin; j < hunk_end; j++)
526 sline[j].flag &= ~mark;
527 }
528 i = hunk_end;
529 }
530 has_interesting = give_context(sline, cnt, num_parent);
532 return has_interesting;
533}
534static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, unsigned long cnt, int n)
536{
537 l0 = sline[l0].p_lno[n];
538 l1 = sline[l1].p_lno[n];
539 printf(" -%lu,%lu", l0, l1-l0);
540}
541static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent)
543{
544 unsigned long mark = (1UL<<num_parent);
545 int i;
546 unsigned long lno = 0;
547 if (!cnt)
549 return; /* result deleted */
550 while (1) {
552 struct sline *sl = &sline[lno];
553 int hunk_end;
554 while (lno < cnt && !(sline[lno].flag & mark))
555 lno++;
556 if (cnt <= lno)
557 break;
558 for (hunk_end = lno + 1; hunk_end < cnt; hunk_end++)
559 if (!(sline[hunk_end].flag & mark))
560 break;
561 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
562 for (i = 0; i < num_parent; i++)
563 show_parent_lno(sline, lno, hunk_end, cnt, i);
564 printf(" +%lu,%lu ", lno+1, hunk_end-lno);
565 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
566 putchar('\n');
567 while (lno < hunk_end) {
568 struct lline *ll;
569 int j;
570 unsigned long p_mask;
571 sl = &sline[lno++];
572 ll = sl->lost_head;
573 while (ll) {
574 for (j = 0; j < num_parent; j++) {
575 if (ll->parent_map & (1UL<<j))
576 putchar('-');
577 else
578 putchar(' ');
579 }
580 puts(ll->line);
581 ll = ll->next;
582 }
583 p_mask = 1;
584 for (j = 0; j < num_parent; j++) {
585 if (p_mask & sl->flag)
586 putchar('+');
587 else
588 putchar(' ');
589 p_mask <<= 1;
590 }
591 printf("%.*s\n", sl->len, sl->bol);
592 }
593 }
594}
595static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
597 int i, int j)
598{
599 /* We have already examined parent j and we know parent i
600 * and parent j are the same, so reuse the combined result
601 * of parent j for parent i.
602 */
603 unsigned long lno, imask, jmask;
604 imask = (1UL<<i);
605 jmask = (1UL<<j);
606 for (lno = 0; lno < cnt; lno++) {
608 struct lline *ll = sline->lost_head;
609 sline->p_lno[i] = sline->p_lno[j];
610 while (ll) {
611 if (ll->parent_map & jmask)
612 ll->parent_map |= imask;
613 ll = ll->next;
614 }
615 if (sline->flag & jmask)
616 sline->flag |= imask;
617 sline++;
618 }
619 /* the overall size of the file (sline[cnt]) */
620 sline->p_lno[i] = sline->p_lno[j];
621}
622static int show_patch_diff(struct combine_diff_path *elem, int num_parent,
624 int dense, const char *header,
625 struct diff_options *opt)
626{
627 unsigned long size, cnt, lno;
628 char *result, *cp, *ep;
629 struct sline *sline; /* survived lines */
630 int mode_differs = 0;
631 int i, show_hunks, shown_header = 0;
632 char ourtmp_buf[TMPPATHLEN];
633 char *ourtmp = ourtmp_buf;
634 int working_tree_file = !memcmp(elem->sha1, null_sha1, 20);
635 int abbrev = opt->full_index ? 40 : DEFAULT_ABBREV;
636 /* Read the result of merge first */
638 if (!working_tree_file) {
639 result = grab_blob(elem->sha1, &size);
640 write_to_temp_file(ourtmp, result, size);
641 }
642 else {
643 /* Used by diff-tree to read from the working tree */
644 struct stat st;
645 int fd;
646 ourtmp = elem->path;
647 if (0 <= (fd = open(ourtmp, O_RDONLY)) &&
648 !fstat(fd, &st)) {
649 int len = st.st_size;
650 int cnt = 0;
651 elem->mode = canon_mode(st.st_mode);
653 size = len;
654 result = xmalloc(len + 1);
655 while (cnt < len) {
656 int done = xread(fd, result+cnt, len-cnt);
657 if (done == 0)
658 break;
659 if (done < 0)
660 die("read error '%s'", ourtmp);
661 cnt += done;
662 }
663 result[len] = 0;
664 }
665 else {
666 /* deleted file */
667 size = 0;
668 elem->mode = 0;
669 result = xmalloc(1);
670 result[0] = 0;
671 ourtmp = "/dev/null";
672 }
673 if (0 <= fd)
674 close(fd);
675 }
676 for (cnt = 0, cp = result; cp - result < size; cp++) {
678 if (*cp == '\n')
679 cnt++;
680 }
681 if (size && result[size-1] != '\n')
682 cnt++; /* incomplete line */
683 sline = xcalloc(cnt+1, sizeof(*sline));
685 ep = result;
686 sline[0].bol = result;
687 for (lno = 0; lno <= cnt; lno++) {
688 sline[lno].lost_tail = &sline[lno].lost_head;
689 sline[lno].flag = 0;
690 }
691 for (lno = 0, cp = result; cp - result < size; cp++) {
692 if (*cp == '\n') {
693 sline[lno].len = cp - sline[lno].bol;
694 lno++;
695 if (lno < cnt)
696 sline[lno].bol = cp + 1;
697 }
698 }
699 if (size && result[size-1] != '\n')
700 sline[cnt-1].len = size - (sline[cnt-1].bol - result);
701 sline[0].p_lno = xcalloc((cnt+1) * num_parent, sizeof(unsigned long));
703 for (lno = 0; lno < cnt; lno++)
704 sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
705 for (i = 0; i < num_parent; i++) {
707 int j;
708 for (j = 0; j < i; j++) {
709 if (!memcmp(elem->parent[i].sha1,
710 elem->parent[j].sha1, 20)) {
711 reuse_combine_diff(sline, cnt, i, j);
712 break;
713 }
714 }
715 if (i <= j)
716 combine_diff(elem->parent[i].sha1, ourtmp, sline,
717 cnt, i, num_parent);
718 if (elem->parent[i].mode != elem->mode)
719 mode_differs = 1;
720 }
721 show_hunks = make_hunks(sline, cnt, num_parent, dense);
723 if (show_hunks || mode_differs || working_tree_file) {
725 const char *abb;
726 if (header) {
728 shown_header++;
729 printf("%s%c", header, opt->line_termination);
730 }
731 printf("diff --%s ", dense ? "cc" : "combined");
732 if (quote_c_style(elem->path, NULL, NULL, 0))
733 quote_c_style(elem->path, NULL, stdout, 0);
734 else
735 printf("%s", elem->path);
736 putchar('\n');
737 printf("index ");
738 for (i = 0; i < num_parent; i++) {
739 abb = find_unique_abbrev(elem->parent[i].sha1,
740 abbrev);
741 printf("%s%s", i ? "," : "", abb);
742 }
743 abb = find_unique_abbrev(elem->sha1, abbrev);
744 printf("..%s\n", abb);
745 if (mode_differs) {
747 int added = !!elem->mode;
748 for (i = 0; added && i < num_parent; i++)
749 if (elem->parent[i].status !=
750 DIFF_STATUS_ADDED)
751 added = 0;
752 if (added)
753 printf("new file mode %06o", elem->mode);
754 else {
755 if (!elem->mode)
756 printf("deleted file ");
757 printf("mode ");
758 for (i = 0; i < num_parent; i++) {
759 printf("%s%06o", i ? "," : "",
760 elem->parent[i].mode);
761 }
762 if (elem->mode)
763 printf("..%06o", elem->mode);
764 }
765 putchar('\n');
766 }
767 dump_sline(sline, cnt, num_parent);
768 }
769 if (ourtmp == ourtmp_buf)
770 unlink(ourtmp);
771 free(result);
772 for (i = 0; i < cnt; i++) {
774 if (sline[i].lost_head) {
775 struct lline *ll = sline[i].lost_head;
776 while (ll) {
777 struct lline *tmp = ll;
778 ll = ll->next;
779 free(tmp);
780 }
781 }
782 }
783 free(sline[0].p_lno);
784 free(sline);
785 return shown_header;
786}
787#define COLONS "::::::::::::::::::::::::::::::::"
789static void show_raw_diff(struct combine_diff_path *p, int num_parent, const char *header, struct diff_options *opt)
791{
792 int i, offset, mod_type = 'A';
793 const char *prefix;
794 int line_termination, inter_name_termination;
795 line_termination = opt->line_termination;
797 inter_name_termination = '\t';
798 if (!line_termination)
799 inter_name_termination = 0;
800 if (header)
802 printf("%s%c", header, line_termination);
803 for (i = 0; i < num_parent; i++) {
805 if (p->parent[i].mode)
806 mod_type = 'M';
807 }
808 if (!p->mode)
809 mod_type = 'D';
810 if (opt->output_format == DIFF_FORMAT_RAW) {
812 offset = strlen(COLONS) - num_parent;
813 if (offset < 0)
814 offset = 0;
815 prefix = COLONS + offset;
816 /* Show the modes */
818 for (i = 0; i < num_parent; i++) {
819 printf("%s%06o", prefix, p->parent[i].mode);
820 prefix = " ";
821 }
822 printf("%s%06o", prefix, p->mode);
823 /* Show sha1's */
825 for (i = 0; i < num_parent; i++)
826 printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
827 opt->abbrev));
828 printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
829 }
830 if (opt->output_format == DIFF_FORMAT_RAW ||
832 opt->output_format == DIFF_FORMAT_NAME_STATUS) {
833 for (i = 0; i < num_parent; i++)
834 putchar(p->parent[i].status);
835 putchar(inter_name_termination);
836 }
837 if (line_termination) {
839 if (quote_c_style(p->path, NULL, NULL, 0))
840 quote_c_style(p->path, NULL, stdout, 0);
841 else
842 printf("%s", p->path);
843 putchar(line_termination);
844 }
845 else {
846 printf("%s%c", p->path, line_termination);
847 }
848}
849int show_combined_diff(struct combine_diff_path *p,
851 int num_parent,
852 int dense,
853 const char *header,
854 struct diff_options *opt)
855{
856 if (!p->len)
857 return 0;
858 switch (opt->output_format) {
859 case DIFF_FORMAT_RAW:
860 case DIFF_FORMAT_NAME_STATUS:
861 case DIFF_FORMAT_NAME:
862 show_raw_diff(p, num_parent, header, opt);
863 return 1;
864 default:
866 case DIFF_FORMAT_PATCH:
867 return show_patch_diff(p, num_parent, dense, header, opt);
868 }
869}
870const char *diff_tree_combined_merge(const unsigned char *sha1,
872 const char *header, int dense,
873 struct diff_options *opt)
874{
875 struct commit *commit = lookup_commit(sha1);
876 struct diff_options diffopts;
877 struct commit_list *parents;
878 struct combine_diff_path *p, *paths = NULL;
879 int num_parent, i, num_paths;
880 diffopts = *opt;
882 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
883 diffopts.recursive = 1;
884 /* count parents */
886 for (parents = commit->parents, num_parent = 0;
887 parents;
888 parents = parents->next, num_parent++)
889 ; /* nothing */
890 /* find set of paths that everybody touches */
892 for (parents = commit->parents, i = 0;
893 parents;
894 parents = parents->next, i++) {
895 struct commit *parent = parents->item;
896 diff_tree_sha1(parent->object.sha1, commit->object.sha1, "",
897 &diffopts);
898 diffcore_std(&diffopts);
899 paths = intersect_paths(paths, i, num_parent);
900 diff_flush(&diffopts);
901 }
902 /* find out surviving paths */
904 for (num_paths = 0, p = paths; p; p = p->next) {
905 if (p->len)
906 num_paths++;
907 }
908 if (num_paths) {
909 for (p = paths; p; p = p->next) {
910 if (show_combined_diff(p, num_parent, dense,
911 header, opt))
912 header = NULL;
913 }
914 }
915 /* Clean things up */
917 while (paths) {
918 struct combine_diff_path *tmp = paths;
919 paths = paths->next;
920 free(tmp);
921 }
922 return header;
923}