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Git 1.7.0.4
[tgit.git] / combine-diff.c
blob61626912e3bca2571b41fd1256067470dc170cc1
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 #include "log-tree.h"
9 #include "refs.h"
10
11 static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
12 {
13 struct diff_queue_struct *q = &diff_queued_diff;
14 struct combine_diff_path *p;
15 int i;
16
17 if (!n) {
18 struct combine_diff_path *list = NULL, **tail = &list;
19 for (i = 0; i < q->nr; i++) {
20 int len;
21 const char *path;
22 if (diff_unmodified_pair(q->queue[i]))
23 continue;
24 path = q->queue[i]->two->path;
25 len = strlen(path);
26 p = xmalloc(combine_diff_path_size(num_parent, len));
27 p->path = (char *) &(p->parent[num_parent]);
28 memcpy(p->path, path, len);
29 p->path[len] = 0;
30 p->len = len;
31 p->next = NULL;
32 memset(p->parent, 0,
33 sizeof(p->parent[0]) * num_parent);
34
35 hashcpy(p->sha1, q->queue[i]->two->sha1);
36 p->mode = q->queue[i]->two->mode;
37 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
38 p->parent[n].mode = q->queue[i]->one->mode;
39 p->parent[n].status = q->queue[i]->status;
40 *tail = p;
41 tail = &p->next;
42 }
43 return list;
44 }
45
46 for (p = curr; p; p = p->next) {
47 int found = 0;
48 if (!p->len)
49 continue;
50 for (i = 0; i < q->nr; i++) {
51 const char *path;
52 int len;
53
54 if (diff_unmodified_pair(q->queue[i]))
55 continue;
56 path = q->queue[i]->two->path;
57 len = strlen(path);
58 if (len == p->len && !memcmp(path, p->path, len)) {
59 found = 1;
60 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
61 p->parent[n].mode = q->queue[i]->one->mode;
62 p->parent[n].status = q->queue[i]->status;
63 break;
64 }
65 }
66 if (!found)
67 p->len = 0;
68 }
69 return curr;
70 }
71
72 /* Lines lost from parent */
73 struct lline {
74 struct lline *next;
75 int len;
76 unsigned long parent_map;
77 char line[FLEX_ARRAY];
78 };
79
80 /* Lines surviving in the merge result */
81 struct sline {
82 struct lline *lost_head, **lost_tail;
83 struct lline *next_lost;
84 char *bol;
85 int len;
86 /* bit 0 up to (N-1) are on if the parent has this line (i.e.
87 * we did not change it).
88 * bit N is used for "interesting" lines, including context.
89 * bit (N+1) is used for "do not show deletion before this".
90 */
91 unsigned long flag;
92 unsigned long *p_lno;
93 };
94
95 static char *grab_blob(const unsigned char *sha1, unsigned int mode, unsigned long *size)
96 {
97 char *blob;
98 enum object_type type;
99
100 if (S_ISGITLINK(mode)) {
101 blob = xmalloc(100);
102 *size = snprintf(blob, 100,
103 "Subproject commit %s\n", sha1_to_hex(sha1));
104 } else if (is_null_sha1(sha1)) {
105 /* deleted blob */
106 *size = 0;
107 return xcalloc(1, 1);
108 } else {
109 blob = read_sha1_file(sha1, &type, size);
110 if (type != OBJ_BLOB)
111 die("object '%s' is not a blob!", sha1_to_hex(sha1));
112 }
113 return blob;
114 }
115
116 static void append_lost(struct sline *sline, int n, const char *line, int len)
117 {
118 struct lline *lline;
119 unsigned long this_mask = (1UL<<n);
120 if (line[len-1] == '\n')
121 len--;
122
123 /* Check to see if we can squash things */
124 if (sline->lost_head) {
125 lline = sline->next_lost;
126 while (lline) {
127 if (lline->len == len &&
128 !memcmp(lline->line, line, len)) {
129 lline->parent_map |= this_mask;
130 sline->next_lost = lline->next;
131 return;
132 }
133 lline = lline->next;
134 }
135 }
136
137 lline = xmalloc(sizeof(*lline) + len + 1);
138 lline->len = len;
139 lline->next = NULL;
140 lline->parent_map = this_mask;
141 memcpy(lline->line, line, len);
142 lline->line[len] = 0;
143 *sline->lost_tail = lline;
144 sline->lost_tail = &lline->next;
145 sline->next_lost = NULL;
146 }
147
148 struct combine_diff_state {
149 unsigned int lno;
150 int ob, on, nb, nn;
151 unsigned long nmask;
152 int num_parent;
153 int n;
154 struct sline *sline;
155 struct sline *lost_bucket;
156 };
157
158 static void consume_line(void *state_, char *line, unsigned long len)
159 {
160 struct combine_diff_state *state = state_;
161 if (5 < len && !memcmp("@@ -", line, 4)) {
162 if (parse_hunk_header(line, len,
163 &state->ob, &state->on,
164 &state->nb, &state->nn))
165 return;
166 state->lno = state->nb;
167 if (state->nn == 0) {
168 /* @@ -X,Y +N,0 @@ removed Y lines
169 * that would have come *after* line N
170 * in the result. Our lost buckets hang
171 * to the line after the removed lines,
172 *
173 * Note that this is correct even when N == 0,
174 * in which case the hunk removes the first
175 * line in the file.
176 */
177 state->lost_bucket = &state->sline[state->nb];
178 if (!state->nb)
179 state->nb = 1;
180 } else {
181 state->lost_bucket = &state->sline[state->nb-1];
182 }
183 if (!state->sline[state->nb-1].p_lno)
184 state->sline[state->nb-1].p_lno =
185 xcalloc(state->num_parent,
186 sizeof(unsigned long));
187 state->sline[state->nb-1].p_lno[state->n] = state->ob;
188 state->lost_bucket->next_lost = state->lost_bucket->lost_head;
189 return;
190 }
191 if (!state->lost_bucket)
192 return; /* not in any hunk yet */
193 switch (line[0]) {
194 case '-':
195 append_lost(state->lost_bucket, state->n, line+1, len-1);
196 break;
197 case '+':
198 state->sline[state->lno-1].flag |= state->nmask;
199 state->lno++;
200 break;
201 }
202 }
203
204 static void combine_diff(const unsigned char *parent, unsigned int mode,
205 mmfile_t *result_file,
206 struct sline *sline, unsigned int cnt, int n,
207 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, mode, &sz);
222 parent_file.size = sz;
223 memset(&xpp, 0, sizeof(xpp));
224 xpp.flags = XDF_NEED_MINIMAL;
225 memset(&xecfg, 0, sizeof(xecfg));
226 memset(&state, 0, sizeof(state));
227 state.nmask = nmask;
228 state.sline = sline;
229 state.lno = 1;
230 state.num_parent = num_parent;
231 state.n = n;
232
233 xdi_diff_outf(&parent_file, result_file, consume_line, &state,
234 &xpp, &xecfg, &ecb);
235 free(parent_file.ptr);
236
237 /* Assign line numbers for this parent.
238 *
239 * sline[lno].p_lno[n] records the first line number
240 * (counting from 1) for parent N if the final hunk display
241 * started by showing sline[lno] (possibly showing the lost
242 * lines attached to it first).
243 */
244 for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
245 struct lline *ll;
246 sline[lno].p_lno[n] = p_lno;
247
248 /* How many lines would this sline advance the p_lno? */
249 ll = sline[lno].lost_head;
250 while (ll) {
251 if (ll->parent_map & nmask)
252 p_lno++; /* '-' means parent had it */
253 ll = ll->next;
254 }
255 if (lno < cnt && !(sline[lno].flag & nmask))
256 p_lno++; /* no '+' means parent had it */
257 }
258 sline[lno].p_lno[n] = p_lno; /* trailer */
259 }
260
261 static unsigned long context = 3;
262 static char combine_marker = '@';
263
264 static int interesting(struct sline *sline, unsigned long all_mask)
265 {
266 /* If some parents lost lines here, or if we have added to
267 * some parent, it is interesting.
268 */
269 return ((sline->flag & all_mask) || sline->lost_head);
270 }
271
272 static unsigned long adjust_hunk_tail(struct sline *sline,
273 unsigned long all_mask,
274 unsigned long hunk_begin,
275 unsigned long i)
276 {
277 /* i points at the first uninteresting line. If the last line
278 * of the hunk was interesting only because it has some
279 * deletion, then it is not all that interesting for the
280 * purpose of giving trailing context lines. This is because
281 * we output '-' line and then unmodified sline[i-1] itself in
282 * that case which gives us one extra context line.
283 */
284 if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
285 i--;
286 return i;
287 }
288
289 static unsigned long find_next(struct sline *sline,
290 unsigned long mark,
291 unsigned long i,
292 unsigned long cnt,
293 int look_for_uninteresting)
294 {
295 /* We have examined up to i-1 and are about to look at i.
296 * Find next interesting or uninteresting line. Here,
297 * "interesting" does not mean interesting(), but marked by
298 * the give_context() function below (i.e. it includes context
299 * lines that are not interesting to interesting() function
300 * that are surrounded by interesting() ones.
301 */
302 while (i <= cnt)
303 if (look_for_uninteresting
304 ? !(sline[i].flag & mark)
305 : (sline[i].flag & mark))
306 return i;
307 else
308 i++;
309 return i;
310 }
311
312 static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
313 {
314 unsigned long all_mask = (1UL<<num_parent) - 1;
315 unsigned long mark = (1UL<<num_parent);
316 unsigned long no_pre_delete = (2UL<<num_parent);
317 unsigned long i;
318
319 /* Two groups of interesting lines may have a short gap of
320 * uninteresting lines. Connect such groups to give them a
321 * bit of context.
322 *
323 * We first start from what the interesting() function says,
324 * and mark them with "mark", and paint context lines with the
325 * mark. So interesting() would still say false for such context
326 * lines but they are treated as "interesting" in the end.
327 */
328 i = find_next(sline, mark, 0, cnt, 0);
329 if (cnt < i)
330 return 0;
331
332 while (i <= cnt) {
333 unsigned long j = (context < i) ? (i - context) : 0;
334 unsigned long k;
335
336 /* Paint a few lines before the first interesting line. */
337 while (j < i)
338 sline[j++].flag |= mark | no_pre_delete;
339
340 again:
341 /* we know up to i is to be included. where does the
342 * next uninteresting one start?
343 */
344 j = find_next(sline, mark, i, cnt, 1);
345 if (cnt < j)
346 break; /* the rest are all interesting */
347
348 /* lookahead context lines */
349 k = find_next(sline, mark, j, cnt, 0);
350 j = adjust_hunk_tail(sline, all_mask, i, j);
351
352 if (k < j + context) {
353 /* k is interesting and [j,k) are not, but
354 * paint them interesting because the gap is small.
355 */
356 while (j < k)
357 sline[j++].flag |= mark;
358 i = k;
359 goto again;
360 }
361
362 /* j is the first uninteresting line and there is
363 * no overlap beyond it within context lines. Paint
364 * the trailing edge a bit.
365 */
366 i = k;
367 k = (j + context < cnt+1) ? j + context : cnt+1;
368 while (j < k)
369 sline[j++].flag |= mark;
370 }
371 return 1;
372 }
373
374 static int make_hunks(struct sline *sline, unsigned long cnt,
375 int num_parent, int dense)
376 {
377 unsigned long all_mask = (1UL<<num_parent) - 1;
378 unsigned long mark = (1UL<<num_parent);
379 unsigned long i;
380 int has_interesting = 0;
381
382 for (i = 0; i <= cnt; i++) {
383 if (interesting(&sline[i], all_mask))
384 sline[i].flag |= mark;
385 else
386 sline[i].flag &= ~mark;
387 }
388 if (!dense)
389 return give_context(sline, cnt, num_parent);
390
391 /* Look at each hunk, and if we have changes from only one
392 * parent, or the changes are the same from all but one
393 * parent, mark that uninteresting.
394 */
395 i = 0;
396 while (i <= cnt) {
397 unsigned long j, hunk_begin, hunk_end;
398 unsigned long same_diff;
399 while (i <= cnt && !(sline[i].flag & mark))
400 i++;
401 if (cnt < i)
402 break; /* No more interesting hunks */
403 hunk_begin = i;
404 for (j = i + 1; j <= cnt; j++) {
405 if (!(sline[j].flag & mark)) {
406 /* Look beyond the end to see if there
407 * is an interesting line after this
408 * hunk within context span.
409 */
410 unsigned long la; /* lookahead */
411 int contin = 0;
412 la = adjust_hunk_tail(sline, all_mask,
413 hunk_begin, j);
414 la = (la + context < cnt + 1) ?
415 (la + context) : cnt + 1;
416 while (j <= --la) {
417 if (sline[la].flag & mark) {
418 contin = 1;
419 break;
420 }
421 }
422 if (!contin)
423 break;
424 j = la;
425 }
426 }
427 hunk_end = j;
428
429 /* [i..hunk_end) are interesting. Now is it really
430 * interesting? We check if there are only two versions
431 * and the result matches one of them. That is, we look
432 * at:
433 * (+) line, which records lines added to which parents;
434 * this line appears in the result.
435 * (-) line, which records from what parents the line
436 * was removed; this line does not appear in the result.
437 * then check the set of parents the result has difference
438 * from, from all lines. If there are lines that has
439 * different set of parents that the result has differences
440 * from, that means we have more than two versions.
441 *
442 * Even when we have only two versions, if the result does
443 * not match any of the parents, the it should be considered
444 * interesting. In such a case, we would have all '+' line.
445 * After passing the above "two versions" test, that would
446 * appear as "the same set of parents" to be "all parents".
447 */
448 same_diff = 0;
449 has_interesting = 0;
450 for (j = i; j < hunk_end && !has_interesting; j++) {
451 unsigned long this_diff = sline[j].flag & all_mask;
452 struct lline *ll = sline[j].lost_head;
453 if (this_diff) {
454 /* This has some changes. Is it the
455 * same as others?
456 */
457 if (!same_diff)
458 same_diff = this_diff;
459 else if (same_diff != this_diff) {
460 has_interesting = 1;
461 break;
462 }
463 }
464 while (ll && !has_interesting) {
465 /* Lost this line from these parents;
466 * who are they? Are they the same?
467 */
468 this_diff = ll->parent_map;
469 if (!same_diff)
470 same_diff = this_diff;
471 else if (same_diff != this_diff) {
472 has_interesting = 1;
473 }
474 ll = ll->next;
475 }
476 }
477
478 if (!has_interesting && same_diff != all_mask) {
479 /* This hunk is not that interesting after all */
480 for (j = hunk_begin; j < hunk_end; j++)
481 sline[j].flag &= ~mark;
482 }
483 i = hunk_end;
484 }
485
486 has_interesting = give_context(sline, cnt, num_parent);
487 return has_interesting;
488 }
489
490 static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
491 {
492 l0 = sline[l0].p_lno[n];
493 l1 = sline[l1].p_lno[n];
494 printf(" -%lu,%lu", l0, l1-l0-null_context);
495 }
496
497 static int hunk_comment_line(const char *bol)
498 {
499 int ch;
500
501 if (!bol)
502 return 0;
503 ch = *bol & 0xff;
504 return (isalpha(ch) || ch == '_' || ch == '$');
505 }
506
507 static void show_line_to_eol(const char *line, int len, const char *reset)
508 {
509 int saw_cr_at_eol = 0;
510 if (len < 0)
511 len = strlen(line);
512 saw_cr_at_eol = (len && line[len-1] == '\r');
513
514 printf("%.*s%s%s\n", len - saw_cr_at_eol, line,
515 reset,
516 saw_cr_at_eol ? "\r" : "");
517 }
518
519 static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
520 int use_color)
521 {
522 unsigned long mark = (1UL<<num_parent);
523 unsigned long no_pre_delete = (2UL<<num_parent);
524 int i;
525 unsigned long lno = 0;
526 const char *c_frag = diff_get_color(use_color, DIFF_FRAGINFO);
527 const char *c_func = diff_get_color(use_color, DIFF_FUNCINFO);
528 const char *c_new = diff_get_color(use_color, DIFF_FILE_NEW);
529 const char *c_old = diff_get_color(use_color, DIFF_FILE_OLD);
530 const char *c_plain = diff_get_color(use_color, DIFF_PLAIN);
531 const char *c_reset = diff_get_color(use_color, DIFF_RESET);
532
533 if (!cnt)
534 return; /* result deleted */
535
536 while (1) {
537 unsigned long hunk_end;
538 unsigned long rlines;
539 const char *hunk_comment = NULL;
540 unsigned long null_context = 0;
541
542 while (lno <= cnt && !(sline[lno].flag & mark)) {
543 if (hunk_comment_line(sline[lno].bol))
544 hunk_comment = sline[lno].bol;
545 lno++;
546 }
547 if (cnt < lno)
548 break;
549 else {
550 for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
551 if (!(sline[hunk_end].flag & mark))
552 break;
553 }
554 rlines = hunk_end - lno;
555 if (cnt < hunk_end)
556 rlines--; /* pointing at the last delete hunk */
557
558 if (!context) {
559 /*
560 * Even when running with --unified=0, all
561 * lines in the hunk needs to be processed in
562 * the loop below in order to show the
563 * deletion recorded in lost_head. However,
564 * we do not want to show the resulting line
565 * with all blank context markers in such a
566 * case. Compensate.
567 */
568 unsigned long j;
569 for (j = lno; j < hunk_end; j++)
570 if (!(sline[j].flag & (mark-1)))
571 null_context++;
572 rlines -= null_context;
573 }
574
575 fputs(c_frag, stdout);
576 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
577 for (i = 0; i < num_parent; i++)
578 show_parent_lno(sline, lno, hunk_end, i, null_context);
579 printf(" +%lu,%lu ", lno+1, rlines);
580 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
581
582 if (hunk_comment) {
583 int comment_end = 0;
584 for (i = 0; i < 40; i++) {
585 int ch = hunk_comment[i] & 0xff;
586 if (!ch || ch == '\n')
587 break;
588 if (!isspace(ch))
589 comment_end = i;
590 }
591 if (comment_end)
592 printf("%s%s %s%s", c_reset,
593 c_plain, c_reset,
594 c_func);
595 for (i = 0; i < comment_end; i++)
596 putchar(hunk_comment[i]);
597 }
598
599 printf("%s\n", c_reset);
600 while (lno < hunk_end) {
601 struct lline *ll;
602 int j;
603 unsigned long p_mask;
604 struct sline *sl = &sline[lno++];
605 ll = (sl->flag & no_pre_delete) ? NULL : sl->lost_head;
606 while (ll) {
607 fputs(c_old, stdout);
608 for (j = 0; j < num_parent; j++) {
609 if (ll->parent_map & (1UL<<j))
610 putchar('-');
611 else
612 putchar(' ');
613 }
614 show_line_to_eol(ll->line, -1, c_reset);
615 ll = ll->next;
616 }
617 if (cnt < lno)
618 break;
619 p_mask = 1;
620 if (!(sl->flag & (mark-1))) {
621 /*
622 * This sline was here to hang the
623 * lost lines in front of it.
624 */
625 if (!context)
626 continue;
627 fputs(c_plain, stdout);
628 }
629 else
630 fputs(c_new, stdout);
631 for (j = 0; j < num_parent; j++) {
632 if (p_mask & sl->flag)
633 putchar('+');
634 else
635 putchar(' ');
636 p_mask <<= 1;
637 }
638 show_line_to_eol(sl->bol, sl->len, c_reset);
639 }
640 }
641 }
642
643 static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
644 int i, int j)
645 {
646 /* We have already examined parent j and we know parent i
647 * and parent j are the same, so reuse the combined result
648 * of parent j for parent i.
649 */
650 unsigned long lno, imask, jmask;
651 imask = (1UL<<i);
652 jmask = (1UL<<j);
653
654 for (lno = 0; lno <= cnt; lno++) {
655 struct lline *ll = sline->lost_head;
656 sline->p_lno[i] = sline->p_lno[j];
657 while (ll) {
658 if (ll->parent_map & jmask)
659 ll->parent_map |= imask;
660 ll = ll->next;
661 }
662 if (sline->flag & jmask)
663 sline->flag |= imask;
664 sline++;
665 }
666 /* the overall size of the file (sline[cnt]) */
667 sline->p_lno[i] = sline->p_lno[j];
668 }
669
670 static void dump_quoted_path(const char *head,
671 const char *prefix,
672 const char *path,
673 const char *c_meta, const char *c_reset)
674 {
675 static struct strbuf buf = STRBUF_INIT;
676
677 strbuf_reset(&buf);
678 strbuf_addstr(&buf, c_meta);
679 strbuf_addstr(&buf, head);
680 quote_two_c_style(&buf, prefix, path, 0);
681 strbuf_addstr(&buf, c_reset);
682 puts(buf.buf);
683 }
684
685 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
686 int dense, struct rev_info *rev)
687 {
688 struct diff_options *opt = &rev->diffopt;
689 unsigned long result_size, cnt, lno;
690 char *result, *cp;
691 struct sline *sline; /* survived lines */
692 int mode_differs = 0;
693 int i, show_hunks;
694 int working_tree_file = is_null_sha1(elem->sha1);
695 int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
696 const char *a_prefix, *b_prefix;
697 mmfile_t result_file;
698
699 context = opt->context;
700 a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
701 b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
702
703 /* Read the result of merge first */
704 if (!working_tree_file)
705 result = grab_blob(elem->sha1, elem->mode, &result_size);
706 else {
707 /* Used by diff-tree to read from the working tree */
708 struct stat st;
709 int fd = -1;
710
711 if (lstat(elem->path, &st) < 0)
712 goto deleted_file;
713
714 if (S_ISLNK(st.st_mode)) {
715 struct strbuf buf = STRBUF_INIT;
716
717 if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
718 error("readlink(%s): %s", elem->path,
719 strerror(errno));
720 return;
721 }
722 result_size = buf.len;
723 result = strbuf_detach(&buf, NULL);
724 elem->mode = canon_mode(st.st_mode);
725 } else if (S_ISDIR(st.st_mode)) {
726 unsigned char sha1[20];
727 if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
728 result = grab_blob(elem->sha1, elem->mode, &result_size);
729 else
730 result = grab_blob(sha1, elem->mode, &result_size);
731 } else if (0 <= (fd = open(elem->path, O_RDONLY))) {
732 size_t len = xsize_t(st.st_size);
733 ssize_t done;
734 int is_file, i;
735
736 elem->mode = canon_mode(st.st_mode);
737 /* if symlinks don't work, assume symlink if all parents
738 * are symlinks
739 */
740 is_file = has_symlinks;
741 for (i = 0; !is_file && i < num_parent; i++)
742 is_file = !S_ISLNK(elem->parent[i].mode);
743 if (!is_file)
744 elem->mode = canon_mode(S_IFLNK);
745
746 result_size = len;
747 result = xmalloc(len + 1);
748
749 done = read_in_full(fd, result, len);
750 if (done < 0)
751 die_errno("read error '%s'", elem->path);
752 else if (done < len)
753 die("early EOF '%s'", elem->path);
754
755 result[len] = 0;
756
757 /* If not a fake symlink, apply filters, e.g. autocrlf */
758 if (is_file) {
759 struct strbuf buf = STRBUF_INIT;
760
761 if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
762 free(result);
763 result = strbuf_detach(&buf, &len);
764 result_size = len;
765 }
766 }
767 }
768 else {
769 deleted_file:
770 result_size = 0;
771 elem->mode = 0;
772 result = xcalloc(1, 1);
773 }
774
775 if (0 <= fd)
776 close(fd);
777 }
778
779 for (cnt = 0, cp = result; cp < result + result_size; cp++) {
780 if (*cp == '\n')
781 cnt++;
782 }
783 if (result_size && result[result_size-1] != '\n')
784 cnt++; /* incomplete line */
785
786 sline = xcalloc(cnt+2, sizeof(*sline));
787 sline[0].bol = result;
788 for (lno = 0; lno <= cnt + 1; lno++) {
789 sline[lno].lost_tail = &sline[lno].lost_head;
790 sline[lno].flag = 0;
791 }
792 for (lno = 0, cp = result; cp < result + result_size; cp++) {
793 if (*cp == '\n') {
794 sline[lno].len = cp - sline[lno].bol;
795 lno++;
796 if (lno < cnt)
797 sline[lno].bol = cp + 1;
798 }
799 }
800 if (result_size && result[result_size-1] != '\n')
801 sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
802
803 result_file.ptr = result;
804 result_file.size = result_size;
805
806 /* Even p_lno[cnt+1] is valid -- that is for the end line number
807 * for deletion hunk at the end.
808 */
809 sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
810 for (lno = 0; lno <= cnt; lno++)
811 sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
812
813 for (i = 0; i < num_parent; i++) {
814 int j;
815 for (j = 0; j < i; j++) {
816 if (!hashcmp(elem->parent[i].sha1,
817 elem->parent[j].sha1)) {
818 reuse_combine_diff(sline, cnt, i, j);
819 break;
820 }
821 }
822 if (i <= j)
823 combine_diff(elem->parent[i].sha1,
824 elem->parent[i].mode,
825 &result_file, sline,
826 cnt, i, num_parent);
827 if (elem->parent[i].mode != elem->mode)
828 mode_differs = 1;
829 }
830
831 show_hunks = make_hunks(sline, cnt, num_parent, dense);
832
833 if (show_hunks || mode_differs || working_tree_file) {
834 const char *abb;
835 int use_color = DIFF_OPT_TST(opt, COLOR_DIFF);
836 const char *c_meta = diff_get_color(use_color, DIFF_METAINFO);
837 const char *c_reset = diff_get_color(use_color, DIFF_RESET);
838 int added = 0;
839 int deleted = 0;
840
841 if (rev->loginfo && !rev->no_commit_id)
842 show_log(rev);
843 dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
844 "", elem->path, c_meta, c_reset);
845 printf("%sindex ", c_meta);
846 for (i = 0; i < num_parent; i++) {
847 abb = find_unique_abbrev(elem->parent[i].sha1,
848 abbrev);
849 printf("%s%s", i ? "," : "", abb);
850 }
851 abb = find_unique_abbrev(elem->sha1, abbrev);
852 printf("..%s%s\n", abb, c_reset);
853
854 if (mode_differs) {
855 deleted = !elem->mode;
856
857 /* We say it was added if nobody had it */
858 added = !deleted;
859 for (i = 0; added && i < num_parent; i++)
860 if (elem->parent[i].status !=
861 DIFF_STATUS_ADDED)
862 added = 0;
863 if (added)
864 printf("%snew file mode %06o",
865 c_meta, elem->mode);
866 else {
867 if (deleted)
868 printf("%sdeleted file ", c_meta);
869 printf("mode ");
870 for (i = 0; i < num_parent; i++) {
871 printf("%s%06o", i ? "," : "",
872 elem->parent[i].mode);
873 }
874 if (elem->mode)
875 printf("..%06o", elem->mode);
876 }
877 printf("%s\n", c_reset);
878 }
879 if (added)
880 dump_quoted_path("--- ", "", "/dev/null",
881 c_meta, c_reset);
882 else
883 dump_quoted_path("--- ", a_prefix, elem->path,
884 c_meta, c_reset);
885 if (deleted)
886 dump_quoted_path("+++ ", "", "/dev/null",
887 c_meta, c_reset);
888 else
889 dump_quoted_path("+++ ", b_prefix, elem->path,
890 c_meta, c_reset);
891 dump_sline(sline, cnt, num_parent,
892 DIFF_OPT_TST(opt, COLOR_DIFF));
893 }
894 free(result);
895
896 for (lno = 0; lno < cnt; lno++) {
897 if (sline[lno].lost_head) {
898 struct lline *ll = sline[lno].lost_head;
899 while (ll) {
900 struct lline *tmp = ll;
901 ll = ll->next;
902 free(tmp);
903 }
904 }
905 }
906 free(sline[0].p_lno);
907 free(sline);
908 }
909
910 #define COLONS "::::::::::::::::::::::::::::::::"
911
912 static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
913 {
914 struct diff_options *opt = &rev->diffopt;
915 int i, offset;
916 const char *prefix;
917 int line_termination, inter_name_termination;
918
919 line_termination = opt->line_termination;
920 inter_name_termination = '\t';
921 if (!line_termination)
922 inter_name_termination = 0;
923
924 if (rev->loginfo && !rev->no_commit_id)
925 show_log(rev);
926
927 if (opt->output_format & DIFF_FORMAT_RAW) {
928 offset = strlen(COLONS) - num_parent;
929 if (offset < 0)
930 offset = 0;
931 prefix = COLONS + offset;
932
933 /* Show the modes */
934 for (i = 0; i < num_parent; i++) {
935 printf("%s%06o", prefix, p->parent[i].mode);
936 prefix = " ";
937 }
938 printf("%s%06o", prefix, p->mode);
939
940 /* Show sha1's */
941 for (i = 0; i < num_parent; i++)
942 printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
943 opt->abbrev));
944 printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
945 }
946
947 if (opt->output_format & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) {
948 for (i = 0; i < num_parent; i++)
949 putchar(p->parent[i].status);
950 putchar(inter_name_termination);
951 }
952
953 write_name_quoted(p->path, stdout, line_termination);
954 }
955
956 void show_combined_diff(struct combine_diff_path *p,
957 int num_parent,
958 int dense,
959 struct rev_info *rev)
960 {
961 struct diff_options *opt = &rev->diffopt;
962 if (!p->len)
963 return;
964 if (opt->output_format & (DIFF_FORMAT_RAW |
965 DIFF_FORMAT_NAME |
966 DIFF_FORMAT_NAME_STATUS))
967 show_raw_diff(p, num_parent, rev);
968 else if (opt->output_format & DIFF_FORMAT_PATCH)
969 show_patch_diff(p, num_parent, dense, rev);
970 }
971
972 void diff_tree_combined(const unsigned char *sha1,
973 const unsigned char parent[][20],
974 int num_parent,
975 int dense,
976 struct rev_info *rev)
977 {
978 struct diff_options *opt = &rev->diffopt;
979 struct diff_options diffopts;
980 struct combine_diff_path *p, *paths = NULL;
981 int i, num_paths, needsep, show_log_first;
982
983 diffopts = *opt;
984 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
985 DIFF_OPT_SET(&diffopts, RECURSIVE);
986 DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
987
988 show_log_first = !!rev->loginfo && !rev->no_commit_id;
989 needsep = 0;
990 /* find set of paths that everybody touches */
991 for (i = 0; i < num_parent; i++) {
992 /* show stat against the first parent even
993 * when doing combined diff.
994 */
995 int stat_opt = (opt->output_format &
996 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
997 if (i == 0 && stat_opt)
998 diffopts.output_format = stat_opt;
999 else
1000 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
1001 diff_tree_sha1(parent[i], sha1, "", &diffopts);
1002 diffcore_std(&diffopts);
1003 paths = intersect_paths(paths, i, num_parent);
1004
1005 if (show_log_first && i == 0) {
1006 show_log(rev);
1007 if (rev->verbose_header && opt->output_format)
1008 putchar(opt->line_termination);
1009 }
1010 diff_flush(&diffopts);
1011 }
1012
1013 /* find out surviving paths */
1014 for (num_paths = 0, p = paths; p; p = p->next) {
1015 if (p->len)
1016 num_paths++;
1017 }
1018 if (num_paths) {
1019 if (opt->output_format & (DIFF_FORMAT_RAW |
1020 DIFF_FORMAT_NAME |
1021 DIFF_FORMAT_NAME_STATUS)) {
1022 for (p = paths; p; p = p->next) {
1023 if (p->len)
1024 show_raw_diff(p, num_parent, rev);
1025 }
1026 needsep = 1;
1027 }
1028 else if (opt->output_format &
1029 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT))
1030 needsep = 1;
1031 if (opt->output_format & DIFF_FORMAT_PATCH) {
1032 if (needsep)
1033 putchar(opt->line_termination);
1034 for (p = paths; p; p = p->next) {
1035 if (p->len)
1036 show_patch_diff(p, num_parent, dense,
1037 rev);
1038 }
1039 }
1040 }
1041
1042 /* Clean things up */
1043 while (paths) {
1044 struct combine_diff_path *tmp = paths;
1045 paths = paths->next;
1046 free(tmp);
1047 }
1048 }
1049
1050 void diff_tree_combined_merge(const unsigned char *sha1,
1051 int dense, struct rev_info *rev)
1052 {
1053 int num_parent;
1054 const unsigned char (*parent)[20];
1055 struct commit *commit = lookup_commit(sha1);
1056 struct commit_list *parents;
1057
1058 /* count parents */
1059 for (parents = commit->parents, num_parent = 0;
1060 parents;
1061 parents = parents->next, num_parent++)
1062 ; /* nothing */
1063
1064 parent = xmalloc(num_parent * sizeof(*parent));
1065 for (parents = commit->parents, num_parent = 0;
1066 parents;
1067 parents = parents->next, num_parent++)
1068 hashcpy((unsigned char *)(parent + num_parent),
1069 parents->item->object.sha1);
1070 diff_tree_combined(sha1, parent, num_parent, dense, rev);
1071 }