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dir.c: move prep_exclude
[git/gitweb.git] / combine-diff.c
blob77d7872aafe659045e9ec228de97e87c9cea00a1
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 "xdiff/xmacros.h"
9 #include "log-tree.h"
10 #include "refs.h"
11 #include "userdiff.h"
12 #include "sha1-array.h"
13
14 static 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
20 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 (diff_unmodified_pair(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
38 hashcpy(p->sha1, q->queue[i]->two->sha1);
39 p->mode = q->queue[i]->two->mode;
40 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
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
49 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
57 if (diff_unmodified_pair(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 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
64 p->parent[n].mode = q->queue[i]->one->mode;
65 p->parent[n].status = q->queue[i]->status;
66 break;
67 }
68 }
69 if (!found)
70 p->len = 0;
71 }
72 return curr;
73 }
74
75 /* Lines lost from parent */
76 struct lline {
77 struct lline *next, *prev;
78 int len;
79 unsigned long parent_map;
80 char line[FLEX_ARRAY];
81 };
82
83 /* Lines lost from current parent (before coalescing) */
84 struct plost {
85 struct lline *lost_head, *lost_tail;
86 int len;
87 };
88
89 /* Lines surviving in the merge result */
90 struct sline {
91 /* Accumulated and coalesced lost lines */
92 struct lline *lost;
93 int lenlost;
94 struct plost plost;
95 char *bol;
96 int len;
97 /* bit 0 up to (N-1) are on if the parent has this line (i.e.
98 * we did not change it).
99 * bit N is used for "interesting" lines, including context.
100 * bit (N+1) is used for "do not show deletion before this".
101 */
102 unsigned long flag;
103 unsigned long *p_lno;
104 };
105
106 static int match_string_spaces(const char *line1, int len1,
107 const char *line2, int len2,
108 long flags)
109 {
110 if (flags & XDF_WHITESPACE_FLAGS) {
111 for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--);
112 for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--);
113 }
114
115 if (!(flags & (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE)))
116 return (len1 == len2 && !memcmp(line1, line2, len1));
117
118 while (len1 > 0 && len2 > 0) {
119 len1--;
120 len2--;
121 if (XDL_ISSPACE(line1[len1]) || XDL_ISSPACE(line2[len2])) {
122 if ((flags & XDF_IGNORE_WHITESPACE_CHANGE) &&
123 (!XDL_ISSPACE(line1[len1]) || !XDL_ISSPACE(line2[len2])))
124 return 0;
125
126 for (; len1 > 0 && XDL_ISSPACE(line1[len1]); len1--);
127 for (; len2 > 0 && XDL_ISSPACE(line2[len2]); len2--);
128 }
129 if (line1[len1] != line2[len2])
130 return 0;
131 }
132
133 if (flags & XDF_IGNORE_WHITESPACE) {
134 /* Consume remaining spaces */
135 for (; len1 > 0 && XDL_ISSPACE(line1[len1 - 1]); len1--);
136 for (; len2 > 0 && XDL_ISSPACE(line2[len2 - 1]); len2--);
137 }
138
139 /* We matched full line1 and line2 */
140 if (!len1 && !len2)
141 return 1;
142
143 return 0;
144 }
145
146 enum coalesce_direction { MATCH, BASE, NEW };
147
148 /* Coalesce new lines into base by finding LCS */
149 static struct lline *coalesce_lines(struct lline *base, int *lenbase,
150 struct lline *new, int lennew,
151 unsigned long parent, long flags)
152 {
153 int **lcs;
154 enum coalesce_direction **directions;
155 struct lline *baseend, *newend = NULL;
156 int i, j, origbaselen = *lenbase;
157
158 if (new == NULL)
159 return base;
160
161 if (base == NULL) {
162 *lenbase = lennew;
163 return new;
164 }
165
166 /*
167 * Coalesce new lines into base by finding the LCS
168 * - Create the table to run dynamic programing
169 * - Compute the LCS
170 * - Then reverse read the direction structure:
171 * - If we have MATCH, assign parent to base flag, and consume
172 * both baseend and newend
173 * - Else if we have BASE, consume baseend
174 * - Else if we have NEW, insert newend lline into base and
175 * consume newend
176 */
177 lcs = xcalloc(origbaselen + 1, sizeof(int*));
178 directions = xcalloc(origbaselen + 1, sizeof(enum coalesce_direction*));
179 for (i = 0; i < origbaselen + 1; i++) {
180 lcs[i] = xcalloc(lennew + 1, sizeof(int));
181 directions[i] = xcalloc(lennew + 1, sizeof(enum coalesce_direction));
182 directions[i][0] = BASE;
183 }
184 for (j = 1; j < lennew + 1; j++)
185 directions[0][j] = NEW;
186
187 for (i = 1, baseend = base; i < origbaselen + 1; i++) {
188 for (j = 1, newend = new; j < lennew + 1; j++) {
189 if (match_string_spaces(baseend->line, baseend->len,
190 newend->line, newend->len, flags)) {
191 lcs[i][j] = lcs[i - 1][j - 1] + 1;
192 directions[i][j] = MATCH;
193 } else if (lcs[i][j - 1] >= lcs[i - 1][j]) {
194 lcs[i][j] = lcs[i][j - 1];
195 directions[i][j] = NEW;
196 } else {
197 lcs[i][j] = lcs[i - 1][j];
198 directions[i][j] = BASE;
199 }
200 if (newend->next)
201 newend = newend->next;
202 }
203 if (baseend->next)
204 baseend = baseend->next;
205 }
206
207 for (i = 0; i < origbaselen + 1; i++)
208 free(lcs[i]);
209 free(lcs);
210
211 /* At this point, baseend and newend point to the end of each lists */
212 i--;
213 j--;
214 while (i != 0 || j != 0) {
215 if (directions[i][j] == MATCH) {
216 baseend->parent_map |= 1<<parent;
217 baseend = baseend->prev;
218 newend = newend->prev;
219 i--;
220 j--;
221 } else if (directions[i][j] == NEW) {
222 struct lline *lline;
223
224 lline = newend;
225 /* Remove lline from new list and update newend */
226 if (lline->prev)
227 lline->prev->next = lline->next;
228 else
229 new = lline->next;
230 if (lline->next)
231 lline->next->prev = lline->prev;
232
233 newend = lline->prev;
234 j--;
235
236 /* Add lline to base list */
237 if (baseend) {
238 lline->next = baseend->next;
239 lline->prev = baseend;
240 if (lline->prev)
241 lline->prev->next = lline;
242 }
243 else {
244 lline->next = base;
245 base = lline;
246 }
247 (*lenbase)++;
248
249 if (lline->next)
250 lline->next->prev = lline;
251
252 } else {
253 baseend = baseend->prev;
254 i--;
255 }
256 }
257
258 newend = new;
259 while (newend) {
260 struct lline *lline = newend;
261 newend = newend->next;
262 free(lline);
263 }
264
265 for (i = 0; i < origbaselen + 1; i++)
266 free(directions[i]);
267 free(directions);
268
269 return base;
270 }
271
272 static char *grab_blob(const unsigned char *sha1, unsigned int mode,
273 unsigned long *size, struct userdiff_driver *textconv,
274 const char *path)
275 {
276 char *blob;
277 enum object_type type;
278
279 if (S_ISGITLINK(mode)) {
280 blob = xmalloc(100);
281 *size = snprintf(blob, 100,
282 "Subproject commit %s\n", sha1_to_hex(sha1));
283 } else if (is_null_sha1(sha1)) {
284 /* deleted blob */
285 *size = 0;
286 return xcalloc(1, 1);
287 } else if (textconv) {
288 struct diff_filespec *df = alloc_filespec(path);
289 fill_filespec(df, sha1, 1, mode);
290 *size = fill_textconv(textconv, df, &blob);
291 free_filespec(df);
292 } else {
293 blob = read_sha1_file(sha1, &type, size);
294 if (type != OBJ_BLOB)
295 die("object '%s' is not a blob!", sha1_to_hex(sha1));
296 }
297 return blob;
298 }
299
300 static void append_lost(struct sline *sline, int n, const char *line, int len)
301 {
302 struct lline *lline;
303 unsigned long this_mask = (1UL<<n);
304 if (line[len-1] == '\n')
305 len--;
306
307 lline = xmalloc(sizeof(*lline) + len + 1);
308 lline->len = len;
309 lline->next = NULL;
310 lline->prev = sline->plost.lost_tail;
311 if (lline->prev)
312 lline->prev->next = lline;
313 else
314 sline->plost.lost_head = lline;
315 sline->plost.lost_tail = lline;
316 sline->plost.len++;
317 lline->parent_map = this_mask;
318 memcpy(lline->line, line, len);
319 lline->line[len] = 0;
320 }
321
322 struct combine_diff_state {
323 unsigned int lno;
324 int ob, on, nb, nn;
325 unsigned long nmask;
326 int num_parent;
327 int n;
328 struct sline *sline;
329 struct sline *lost_bucket;
330 };
331
332 static void consume_line(void *state_, char *line, unsigned long len)
333 {
334 struct combine_diff_state *state = state_;
335 if (5 < len && !memcmp("@@ -", line, 4)) {
336 if (parse_hunk_header(line, len,
337 &state->ob, &state->on,
338 &state->nb, &state->nn))
339 return;
340 state->lno = state->nb;
341 if (state->nn == 0) {
342 /* @@ -X,Y +N,0 @@ removed Y lines
343 * that would have come *after* line N
344 * in the result. Our lost buckets hang
345 * to the line after the removed lines,
346 *
347 * Note that this is correct even when N == 0,
348 * in which case the hunk removes the first
349 * line in the file.
350 */
351 state->lost_bucket = &state->sline[state->nb];
352 if (!state->nb)
353 state->nb = 1;
354 } else {
355 state->lost_bucket = &state->sline[state->nb-1];
356 }
357 if (!state->sline[state->nb-1].p_lno)
358 state->sline[state->nb-1].p_lno =
359 xcalloc(state->num_parent,
360 sizeof(unsigned long));
361 state->sline[state->nb-1].p_lno[state->n] = state->ob;
362 return;
363 }
364 if (!state->lost_bucket)
365 return; /* not in any hunk yet */
366 switch (line[0]) {
367 case '-':
368 append_lost(state->lost_bucket, state->n, line+1, len-1);
369 break;
370 case '+':
371 state->sline[state->lno-1].flag |= state->nmask;
372 state->lno++;
373 break;
374 }
375 }
376
377 static void combine_diff(const unsigned char *parent, unsigned int mode,
378 mmfile_t *result_file,
379 struct sline *sline, unsigned int cnt, int n,
380 int num_parent, int result_deleted,
381 struct userdiff_driver *textconv,
382 const char *path, long flags)
383 {
384 unsigned int p_lno, lno;
385 unsigned long nmask = (1UL << n);
386 xpparam_t xpp;
387 xdemitconf_t xecfg;
388 mmfile_t parent_file;
389 struct combine_diff_state state;
390 unsigned long sz;
391
392 if (result_deleted)
393 return; /* result deleted */
394
395 parent_file.ptr = grab_blob(parent, mode, &sz, textconv, path);
396 parent_file.size = sz;
397 memset(&xpp, 0, sizeof(xpp));
398 xpp.flags = flags;
399 memset(&xecfg, 0, sizeof(xecfg));
400 memset(&state, 0, sizeof(state));
401 state.nmask = nmask;
402 state.sline = sline;
403 state.lno = 1;
404 state.num_parent = num_parent;
405 state.n = n;
406
407 xdi_diff_outf(&parent_file, result_file, consume_line, &state,
408 &xpp, &xecfg);
409 free(parent_file.ptr);
410
411 /* Assign line numbers for this parent.
412 *
413 * sline[lno].p_lno[n] records the first line number
414 * (counting from 1) for parent N if the final hunk display
415 * started by showing sline[lno] (possibly showing the lost
416 * lines attached to it first).
417 */
418 for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
419 struct lline *ll;
420 sline[lno].p_lno[n] = p_lno;
421
422 /* Coalesce new lines */
423 if (sline[lno].plost.lost_head) {
424 struct sline *sl = &sline[lno];
425 sl->lost = coalesce_lines(sl->lost, &sl->lenlost,
426 sl->plost.lost_head,
427 sl->plost.len, n, flags);
428 sl->plost.lost_head = sl->plost.lost_tail = NULL;
429 sl->plost.len = 0;
430 }
431
432 /* How many lines would this sline advance the p_lno? */
433 ll = sline[lno].lost;
434 while (ll) {
435 if (ll->parent_map & nmask)
436 p_lno++; /* '-' means parent had it */
437 ll = ll->next;
438 }
439 if (lno < cnt && !(sline[lno].flag & nmask))
440 p_lno++; /* no '+' means parent had it */
441 }
442 sline[lno].p_lno[n] = p_lno; /* trailer */
443 }
444
445 static unsigned long context = 3;
446 static char combine_marker = '@';
447
448 static int interesting(struct sline *sline, unsigned long all_mask)
449 {
450 /* If some parents lost lines here, or if we have added to
451 * some parent, it is interesting.
452 */
453 return ((sline->flag & all_mask) || sline->lost);
454 }
455
456 static unsigned long adjust_hunk_tail(struct sline *sline,
457 unsigned long all_mask,
458 unsigned long hunk_begin,
459 unsigned long i)
460 {
461 /* i points at the first uninteresting line. If the last line
462 * of the hunk was interesting only because it has some
463 * deletion, then it is not all that interesting for the
464 * purpose of giving trailing context lines. This is because
465 * we output '-' line and then unmodified sline[i-1] itself in
466 * that case which gives us one extra context line.
467 */
468 if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
469 i--;
470 return i;
471 }
472
473 static unsigned long find_next(struct sline *sline,
474 unsigned long mark,
475 unsigned long i,
476 unsigned long cnt,
477 int look_for_uninteresting)
478 {
479 /* We have examined up to i-1 and are about to look at i.
480 * Find next interesting or uninteresting line. Here,
481 * "interesting" does not mean interesting(), but marked by
482 * the give_context() function below (i.e. it includes context
483 * lines that are not interesting to interesting() function
484 * that are surrounded by interesting() ones.
485 */
486 while (i <= cnt)
487 if (look_for_uninteresting
488 ? !(sline[i].flag & mark)
489 : (sline[i].flag & mark))
490 return i;
491 else
492 i++;
493 return i;
494 }
495
496 static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
497 {
498 unsigned long all_mask = (1UL<<num_parent) - 1;
499 unsigned long mark = (1UL<<num_parent);
500 unsigned long no_pre_delete = (2UL<<num_parent);
501 unsigned long i;
502
503 /* Two groups of interesting lines may have a short gap of
504 * uninteresting lines. Connect such groups to give them a
505 * bit of context.
506 *
507 * We first start from what the interesting() function says,
508 * and mark them with "mark", and paint context lines with the
509 * mark. So interesting() would still say false for such context
510 * lines but they are treated as "interesting" in the end.
511 */
512 i = find_next(sline, mark, 0, cnt, 0);
513 if (cnt < i)
514 return 0;
515
516 while (i <= cnt) {
517 unsigned long j = (context < i) ? (i - context) : 0;
518 unsigned long k;
519
520 /* Paint a few lines before the first interesting line. */
521 while (j < i)
522 sline[j++].flag |= mark | no_pre_delete;
523
524 again:
525 /* we know up to i is to be included. where does the
526 * next uninteresting one start?
527 */
528 j = find_next(sline, mark, i, cnt, 1);
529 if (cnt < j)
530 break; /* the rest are all interesting */
531
532 /* lookahead context lines */
533 k = find_next(sline, mark, j, cnt, 0);
534 j = adjust_hunk_tail(sline, all_mask, i, j);
535
536 if (k < j + context) {
537 /* k is interesting and [j,k) are not, but
538 * paint them interesting because the gap is small.
539 */
540 while (j < k)
541 sline[j++].flag |= mark;
542 i = k;
543 goto again;
544 }
545
546 /* j is the first uninteresting line and there is
547 * no overlap beyond it within context lines. Paint
548 * the trailing edge a bit.
549 */
550 i = k;
551 k = (j + context < cnt+1) ? j + context : cnt+1;
552 while (j < k)
553 sline[j++].flag |= mark;
554 }
555 return 1;
556 }
557
558 static int make_hunks(struct sline *sline, unsigned long cnt,
559 int num_parent, int dense)
560 {
561 unsigned long all_mask = (1UL<<num_parent) - 1;
562 unsigned long mark = (1UL<<num_parent);
563 unsigned long i;
564 int has_interesting = 0;
565
566 for (i = 0; i <= cnt; i++) {
567 if (interesting(&sline[i], all_mask))
568 sline[i].flag |= mark;
569 else
570 sline[i].flag &= ~mark;
571 }
572 if (!dense)
573 return give_context(sline, cnt, num_parent);
574
575 /* Look at each hunk, and if we have changes from only one
576 * parent, or the changes are the same from all but one
577 * parent, mark that uninteresting.
578 */
579 i = 0;
580 while (i <= cnt) {
581 unsigned long j, hunk_begin, hunk_end;
582 unsigned long same_diff;
583 while (i <= cnt && !(sline[i].flag & mark))
584 i++;
585 if (cnt < i)
586 break; /* No more interesting hunks */
587 hunk_begin = i;
588 for (j = i + 1; j <= cnt; j++) {
589 if (!(sline[j].flag & mark)) {
590 /* Look beyond the end to see if there
591 * is an interesting line after this
592 * hunk within context span.
593 */
594 unsigned long la; /* lookahead */
595 int contin = 0;
596 la = adjust_hunk_tail(sline, all_mask,
597 hunk_begin, j);
598 la = (la + context < cnt + 1) ?
599 (la + context) : cnt + 1;
600 while (la && j <= --la) {
601 if (sline[la].flag & mark) {
602 contin = 1;
603 break;
604 }
605 }
606 if (!contin)
607 break;
608 j = la;
609 }
610 }
611 hunk_end = j;
612
613 /* [i..hunk_end) are interesting. Now is it really
614 * interesting? We check if there are only two versions
615 * and the result matches one of them. That is, we look
616 * at:
617 * (+) line, which records lines added to which parents;
618 * this line appears in the result.
619 * (-) line, which records from what parents the line
620 * was removed; this line does not appear in the result.
621 * then check the set of parents the result has difference
622 * from, from all lines. If there are lines that has
623 * different set of parents that the result has differences
624 * from, that means we have more than two versions.
625 *
626 * Even when we have only two versions, if the result does
627 * not match any of the parents, the it should be considered
628 * interesting. In such a case, we would have all '+' line.
629 * After passing the above "two versions" test, that would
630 * appear as "the same set of parents" to be "all parents".
631 */
632 same_diff = 0;
633 has_interesting = 0;
634 for (j = i; j < hunk_end && !has_interesting; j++) {
635 unsigned long this_diff = sline[j].flag & all_mask;
636 struct lline *ll = sline[j].lost;
637 if (this_diff) {
638 /* This has some changes. Is it the
639 * same as others?
640 */
641 if (!same_diff)
642 same_diff = this_diff;
643 else if (same_diff != this_diff) {
644 has_interesting = 1;
645 break;
646 }
647 }
648 while (ll && !has_interesting) {
649 /* Lost this line from these parents;
650 * who are they? Are they the same?
651 */
652 this_diff = ll->parent_map;
653 if (!same_diff)
654 same_diff = this_diff;
655 else if (same_diff != this_diff) {
656 has_interesting = 1;
657 }
658 ll = ll->next;
659 }
660 }
661
662 if (!has_interesting && same_diff != all_mask) {
663 /* This hunk is not that interesting after all */
664 for (j = hunk_begin; j < hunk_end; j++)
665 sline[j].flag &= ~mark;
666 }
667 i = hunk_end;
668 }
669
670 has_interesting = give_context(sline, cnt, num_parent);
671 return has_interesting;
672 }
673
674 static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
675 {
676 l0 = sline[l0].p_lno[n];
677 l1 = sline[l1].p_lno[n];
678 printf(" -%lu,%lu", l0, l1-l0-null_context);
679 }
680
681 static int hunk_comment_line(const char *bol)
682 {
683 int ch;
684
685 if (!bol)
686 return 0;
687 ch = *bol & 0xff;
688 return (isalpha(ch) || ch == '_' || ch == '$');
689 }
690
691 static void show_line_to_eol(const char *line, int len, const char *reset)
692 {
693 int saw_cr_at_eol = 0;
694 if (len < 0)
695 len = strlen(line);
696 saw_cr_at_eol = (len && line[len-1] == '\r');
697
698 printf("%.*s%s%s\n", len - saw_cr_at_eol, line,
699 reset,
700 saw_cr_at_eol ? "\r" : "");
701 }
702
703 static void dump_sline(struct sline *sline, const char *line_prefix,
704 unsigned long cnt, int num_parent,
705 int use_color, int result_deleted)
706 {
707 unsigned long mark = (1UL<<num_parent);
708 unsigned long no_pre_delete = (2UL<<num_parent);
709 int i;
710 unsigned long lno = 0;
711 const char *c_frag = diff_get_color(use_color, DIFF_FRAGINFO);
712 const char *c_func = diff_get_color(use_color, DIFF_FUNCINFO);
713 const char *c_new = diff_get_color(use_color, DIFF_FILE_NEW);
714 const char *c_old = diff_get_color(use_color, DIFF_FILE_OLD);
715 const char *c_plain = diff_get_color(use_color, DIFF_PLAIN);
716 const char *c_reset = diff_get_color(use_color, DIFF_RESET);
717
718 if (result_deleted)
719 return; /* result deleted */
720
721 while (1) {
722 unsigned long hunk_end;
723 unsigned long rlines;
724 const char *hunk_comment = NULL;
725 unsigned long null_context = 0;
726
727 while (lno <= cnt && !(sline[lno].flag & mark)) {
728 if (hunk_comment_line(sline[lno].bol))
729 hunk_comment = sline[lno].bol;
730 lno++;
731 }
732 if (cnt < lno)
733 break;
734 else {
735 for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
736 if (!(sline[hunk_end].flag & mark))
737 break;
738 }
739 rlines = hunk_end - lno;
740 if (cnt < hunk_end)
741 rlines--; /* pointing at the last delete hunk */
742
743 if (!context) {
744 /*
745 * Even when running with --unified=0, all
746 * lines in the hunk needs to be processed in
747 * the loop below in order to show the
748 * deletion recorded in lost_head. However,
749 * we do not want to show the resulting line
750 * with all blank context markers in such a
751 * case. Compensate.
752 */
753 unsigned long j;
754 for (j = lno; j < hunk_end; j++)
755 if (!(sline[j].flag & (mark-1)))
756 null_context++;
757 rlines -= null_context;
758 }
759
760 printf("%s%s", line_prefix, c_frag);
761 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
762 for (i = 0; i < num_parent; i++)
763 show_parent_lno(sline, lno, hunk_end, i, null_context);
764 printf(" +%lu,%lu ", lno+1, rlines);
765 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
766
767 if (hunk_comment) {
768 int comment_end = 0;
769 for (i = 0; i < 40; i++) {
770 int ch = hunk_comment[i] & 0xff;
771 if (!ch || ch == '\n')
772 break;
773 if (!isspace(ch))
774 comment_end = i;
775 }
776 if (comment_end)
777 printf("%s%s %s%s", c_reset,
778 c_plain, c_reset,
779 c_func);
780 for (i = 0; i < comment_end; i++)
781 putchar(hunk_comment[i]);
782 }
783
784 printf("%s\n", c_reset);
785 while (lno < hunk_end) {
786 struct lline *ll;
787 int j;
788 unsigned long p_mask;
789 struct sline *sl = &sline[lno++];
790 ll = (sl->flag & no_pre_delete) ? NULL : sl->lost;
791 while (ll) {
792 printf("%s%s", line_prefix, c_old);
793 for (j = 0; j < num_parent; j++) {
794 if (ll->parent_map & (1UL<<j))
795 putchar('-');
796 else
797 putchar(' ');
798 }
799 show_line_to_eol(ll->line, -1, c_reset);
800 ll = ll->next;
801 }
802 if (cnt < lno)
803 break;
804 p_mask = 1;
805 fputs(line_prefix, stdout);
806 if (!(sl->flag & (mark-1))) {
807 /*
808 * This sline was here to hang the
809 * lost lines in front of it.
810 */
811 if (!context)
812 continue;
813 fputs(c_plain, stdout);
814 }
815 else
816 fputs(c_new, stdout);
817 for (j = 0; j < num_parent; j++) {
818 if (p_mask & sl->flag)
819 putchar('+');
820 else
821 putchar(' ');
822 p_mask <<= 1;
823 }
824 show_line_to_eol(sl->bol, sl->len, c_reset);
825 }
826 }
827 }
828
829 static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
830 int i, int j)
831 {
832 /* We have already examined parent j and we know parent i
833 * and parent j are the same, so reuse the combined result
834 * of parent j for parent i.
835 */
836 unsigned long lno, imask, jmask;
837 imask = (1UL<<i);
838 jmask = (1UL<<j);
839
840 for (lno = 0; lno <= cnt; lno++) {
841 struct lline *ll = sline->lost;
842 sline->p_lno[i] = sline->p_lno[j];
843 while (ll) {
844 if (ll->parent_map & jmask)
845 ll->parent_map |= imask;
846 ll = ll->next;
847 }
848 if (sline->flag & jmask)
849 sline->flag |= imask;
850 sline++;
851 }
852 /* the overall size of the file (sline[cnt]) */
853 sline->p_lno[i] = sline->p_lno[j];
854 }
855
856 static void dump_quoted_path(const char *head,
857 const char *prefix,
858 const char *path,
859 const char *line_prefix,
860 const char *c_meta, const char *c_reset)
861 {
862 static struct strbuf buf = STRBUF_INIT;
863
864 strbuf_reset(&buf);
865 strbuf_addstr(&buf, line_prefix);
866 strbuf_addstr(&buf, c_meta);
867 strbuf_addstr(&buf, head);
868 quote_two_c_style(&buf, prefix, path, 0);
869 strbuf_addstr(&buf, c_reset);
870 puts(buf.buf);
871 }
872
873 static void show_combined_header(struct combine_diff_path *elem,
874 int num_parent,
875 int dense,
876 struct rev_info *rev,
877 const char *line_prefix,
878 int mode_differs,
879 int show_file_header)
880 {
881 struct diff_options *opt = &rev->diffopt;
882 int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
883 const char *a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
884 const char *b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
885 const char *c_meta = diff_get_color_opt(opt, DIFF_METAINFO);
886 const char *c_reset = diff_get_color_opt(opt, DIFF_RESET);
887 const char *abb;
888 int added = 0;
889 int deleted = 0;
890 int i;
891
892 if (rev->loginfo && !rev->no_commit_id)
893 show_log(rev);
894
895 dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
896 "", elem->path, line_prefix, c_meta, c_reset);
897 printf("%s%sindex ", line_prefix, c_meta);
898 for (i = 0; i < num_parent; i++) {
899 abb = find_unique_abbrev(elem->parent[i].sha1,
900 abbrev);
901 printf("%s%s", i ? "," : "", abb);
902 }
903 abb = find_unique_abbrev(elem->sha1, abbrev);
904 printf("..%s%s\n", abb, c_reset);
905
906 if (mode_differs) {
907 deleted = !elem->mode;
908
909 /* We say it was added if nobody had it */
910 added = !deleted;
911 for (i = 0; added && i < num_parent; i++)
912 if (elem->parent[i].status !=
913 DIFF_STATUS_ADDED)
914 added = 0;
915 if (added)
916 printf("%s%snew file mode %06o",
917 line_prefix, c_meta, elem->mode);
918 else {
919 if (deleted)
920 printf("%s%sdeleted file ",
921 line_prefix, c_meta);
922 printf("mode ");
923 for (i = 0; i < num_parent; i++) {
924 printf("%s%06o", i ? "," : "",
925 elem->parent[i].mode);
926 }
927 if (elem->mode)
928 printf("..%06o", elem->mode);
929 }
930 printf("%s\n", c_reset);
931 }
932
933 if (!show_file_header)
934 return;
935
936 if (added)
937 dump_quoted_path("--- ", "", "/dev/null",
938 line_prefix, c_meta, c_reset);
939 else
940 dump_quoted_path("--- ", a_prefix, elem->path,
941 line_prefix, c_meta, c_reset);
942 if (deleted)
943 dump_quoted_path("+++ ", "", "/dev/null",
944 line_prefix, c_meta, c_reset);
945 else
946 dump_quoted_path("+++ ", b_prefix, elem->path,
947 line_prefix, c_meta, c_reset);
948 }
949
950 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
951 int dense, int working_tree_file,
952 struct rev_info *rev)
953 {
954 struct diff_options *opt = &rev->diffopt;
955 unsigned long result_size, cnt, lno;
956 int result_deleted = 0;
957 char *result, *cp;
958 struct sline *sline; /* survived lines */
959 int mode_differs = 0;
960 int i, show_hunks;
961 mmfile_t result_file;
962 struct userdiff_driver *userdiff;
963 struct userdiff_driver *textconv = NULL;
964 int is_binary;
965 const char *line_prefix = diff_line_prefix(opt);
966
967 context = opt->context;
968 userdiff = userdiff_find_by_path(elem->path);
969 if (!userdiff)
970 userdiff = userdiff_find_by_name("default");
971 if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV))
972 textconv = userdiff_get_textconv(userdiff);
973
974 /* Read the result of merge first */
975 if (!working_tree_file)
976 result = grab_blob(elem->sha1, elem->mode, &result_size,
977 textconv, elem->path);
978 else {
979 /* Used by diff-tree to read from the working tree */
980 struct stat st;
981 int fd = -1;
982
983 if (lstat(elem->path, &st) < 0)
984 goto deleted_file;
985
986 if (S_ISLNK(st.st_mode)) {
987 struct strbuf buf = STRBUF_INIT;
988
989 if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
990 error("readlink(%s): %s", elem->path,
991 strerror(errno));
992 return;
993 }
994 result_size = buf.len;
995 result = strbuf_detach(&buf, NULL);
996 elem->mode = canon_mode(st.st_mode);
997 } else if (S_ISDIR(st.st_mode)) {
998 unsigned char sha1[20];
999 if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
1000 result = grab_blob(elem->sha1, elem->mode,
1001 &result_size, NULL, NULL);
1002 else
1003 result = grab_blob(sha1, elem->mode,
1004 &result_size, NULL, NULL);
1005 } else if (textconv) {
1006 struct diff_filespec *df = alloc_filespec(elem->path);
1007 fill_filespec(df, null_sha1, 0, st.st_mode);
1008 result_size = fill_textconv(textconv, df, &result);
1009 free_filespec(df);
1010 } else if (0 <= (fd = open(elem->path, O_RDONLY))) {
1011 size_t len = xsize_t(st.st_size);
1012 ssize_t done;
1013 int is_file, i;
1014
1015 elem->mode = canon_mode(st.st_mode);
1016 /* if symlinks don't work, assume symlink if all parents
1017 * are symlinks
1018 */
1019 is_file = has_symlinks;
1020 for (i = 0; !is_file && i < num_parent; i++)
1021 is_file = !S_ISLNK(elem->parent[i].mode);
1022 if (!is_file)
1023 elem->mode = canon_mode(S_IFLNK);
1024
1025 result_size = len;
1026 result = xmalloc(len + 1);
1027
1028 done = read_in_full(fd, result, len);
1029 if (done < 0)
1030 die_errno("read error '%s'", elem->path);
1031 else if (done < len)
1032 die("early EOF '%s'", elem->path);
1033
1034 result[len] = 0;
1035
1036 /* If not a fake symlink, apply filters, e.g. autocrlf */
1037 if (is_file) {
1038 struct strbuf buf = STRBUF_INIT;
1039
1040 if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
1041 free(result);
1042 result = strbuf_detach(&buf, &len);
1043 result_size = len;
1044 }
1045 }
1046 }
1047 else {
1048 deleted_file:
1049 result_deleted = 1;
1050 result_size = 0;
1051 elem->mode = 0;
1052 result = xcalloc(1, 1);
1053 }
1054
1055 if (0 <= fd)
1056 close(fd);
1057 }
1058
1059 for (i = 0; i < num_parent; i++) {
1060 if (elem->parent[i].mode != elem->mode) {
1061 mode_differs = 1;
1062 break;
1063 }
1064 }
1065
1066 if (textconv)
1067 is_binary = 0;
1068 else if (userdiff->binary != -1)
1069 is_binary = userdiff->binary;
1070 else {
1071 is_binary = buffer_is_binary(result, result_size);
1072 for (i = 0; !is_binary && i < num_parent; i++) {
1073 char *buf;
1074 unsigned long size;
1075 buf = grab_blob(elem->parent[i].sha1,
1076 elem->parent[i].mode,
1077 &size, NULL, NULL);
1078 if (buffer_is_binary(buf, size))
1079 is_binary = 1;
1080 free(buf);
1081 }
1082 }
1083 if (is_binary) {
1084 show_combined_header(elem, num_parent, dense, rev,
1085 line_prefix, mode_differs, 0);
1086 printf("Binary files differ\n");
1087 free(result);
1088 return;
1089 }
1090
1091 for (cnt = 0, cp = result; cp < result + result_size; cp++) {
1092 if (*cp == '\n')
1093 cnt++;
1094 }
1095 if (result_size && result[result_size-1] != '\n')
1096 cnt++; /* incomplete line */
1097
1098 sline = xcalloc(cnt+2, sizeof(*sline));
1099 sline[0].bol = result;
1100 for (lno = 0, cp = result; cp < result + result_size; cp++) {
1101 if (*cp == '\n') {
1102 sline[lno].len = cp - sline[lno].bol;
1103 lno++;
1104 if (lno < cnt)
1105 sline[lno].bol = cp + 1;
1106 }
1107 }
1108 if (result_size && result[result_size-1] != '\n')
1109 sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
1110
1111 result_file.ptr = result;
1112 result_file.size = result_size;
1113
1114 /* Even p_lno[cnt+1] is valid -- that is for the end line number
1115 * for deletion hunk at the end.
1116 */
1117 sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
1118 for (lno = 0; lno <= cnt; lno++)
1119 sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
1120
1121 for (i = 0; i < num_parent; i++) {
1122 int j;
1123 for (j = 0; j < i; j++) {
1124 if (!hashcmp(elem->parent[i].sha1,
1125 elem->parent[j].sha1)) {
1126 reuse_combine_diff(sline, cnt, i, j);
1127 break;
1128 }
1129 }
1130 if (i <= j)
1131 combine_diff(elem->parent[i].sha1,
1132 elem->parent[i].mode,
1133 &result_file, sline,
1134 cnt, i, num_parent, result_deleted,
1135 textconv, elem->path, opt->xdl_opts);
1136 }
1137
1138 show_hunks = make_hunks(sline, cnt, num_parent, dense);
1139
1140 if (show_hunks || mode_differs || working_tree_file) {
1141 show_combined_header(elem, num_parent, dense, rev,
1142 line_prefix, mode_differs, 1);
1143 dump_sline(sline, line_prefix, cnt, num_parent,
1144 opt->use_color, result_deleted);
1145 }
1146 free(result);
1147
1148 for (lno = 0; lno < cnt; lno++) {
1149 if (sline[lno].lost) {
1150 struct lline *ll = sline[lno].lost;
1151 while (ll) {
1152 struct lline *tmp = ll;
1153 ll = ll->next;
1154 free(tmp);
1155 }
1156 }
1157 }
1158 free(sline[0].p_lno);
1159 free(sline);
1160 }
1161
1162 static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
1163 {
1164 struct diff_options *opt = &rev->diffopt;
1165 int line_termination, inter_name_termination, i;
1166 const char *line_prefix = diff_line_prefix(opt);
1167
1168 line_termination = opt->line_termination;
1169 inter_name_termination = '\t';
1170 if (!line_termination)
1171 inter_name_termination = 0;
1172
1173 if (rev->loginfo && !rev->no_commit_id)
1174 show_log(rev);
1175
1176
1177 if (opt->output_format & DIFF_FORMAT_RAW) {
1178 printf("%s", line_prefix);
1179
1180 /* As many colons as there are parents */
1181 for (i = 0; i < num_parent; i++)
1182 putchar(':');
1183
1184 /* Show the modes */
1185 for (i = 0; i < num_parent; i++)
1186 printf("%06o ", p->parent[i].mode);
1187 printf("%06o", p->mode);
1188
1189 /* Show sha1's */
1190 for (i = 0; i < num_parent; i++)
1191 printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
1192 opt->abbrev));
1193 printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
1194 }
1195
1196 if (opt->output_format & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) {
1197 for (i = 0; i < num_parent; i++)
1198 putchar(p->parent[i].status);
1199 putchar(inter_name_termination);
1200 }
1201
1202 write_name_quoted(p->path, stdout, line_termination);
1203 }
1204
1205 /*
1206 * The result (p->elem) is from the working tree and their
1207 * parents are typically from multiple stages during a merge
1208 * (i.e. diff-files) or the state in HEAD and in the index
1209 * (i.e. diff-index).
1210 */
1211 void show_combined_diff(struct combine_diff_path *p,
1212 int num_parent,
1213 int dense,
1214 struct rev_info *rev)
1215 {
1216 struct diff_options *opt = &rev->diffopt;
1217
1218 if (!p->len)
1219 return;
1220 if (opt->output_format & (DIFF_FORMAT_RAW |
1221 DIFF_FORMAT_NAME |
1222 DIFF_FORMAT_NAME_STATUS))
1223 show_raw_diff(p, num_parent, rev);
1224 else if (opt->output_format & DIFF_FORMAT_PATCH)
1225 show_patch_diff(p, num_parent, dense, 1, rev);
1226 }
1227
1228 static void free_combined_pair(struct diff_filepair *pair)
1229 {
1230 free(pair->two);
1231 free(pair);
1232 }
1233
1234 /*
1235 * A combine_diff_path expresses N parents on the LHS against 1 merge
1236 * result. Synthesize a diff_filepair that has N entries on the "one"
1237 * side and 1 entry on the "two" side.
1238 *
1239 * In the future, we might want to add more data to combine_diff_path
1240 * so that we can fill fields we are ignoring (most notably, size) here,
1241 * but currently nobody uses it, so this should suffice for now.
1242 */
1243 static struct diff_filepair *combined_pair(struct combine_diff_path *p,
1244 int num_parent)
1245 {
1246 int i;
1247 struct diff_filepair *pair;
1248 struct diff_filespec *pool;
1249
1250 pair = xmalloc(sizeof(*pair));
1251 pool = xcalloc(num_parent + 1, sizeof(struct diff_filespec));
1252 pair->one = pool + 1;
1253 pair->two = pool;
1254
1255 for (i = 0; i < num_parent; i++) {
1256 pair->one[i].path = p->path;
1257 pair->one[i].mode = p->parent[i].mode;
1258 hashcpy(pair->one[i].sha1, p->parent[i].sha1);
1259 pair->one[i].sha1_valid = !is_null_sha1(p->parent[i].sha1);
1260 pair->one[i].has_more_entries = 1;
1261 }
1262 pair->one[num_parent - 1].has_more_entries = 0;
1263
1264 pair->two->path = p->path;
1265 pair->two->mode = p->mode;
1266 hashcpy(pair->two->sha1, p->sha1);
1267 pair->two->sha1_valid = !is_null_sha1(p->sha1);
1268 return pair;
1269 }
1270
1271 static void handle_combined_callback(struct diff_options *opt,
1272 struct combine_diff_path *paths,
1273 int num_parent,
1274 int num_paths)
1275 {
1276 struct combine_diff_path *p;
1277 struct diff_queue_struct q;
1278 int i;
1279
1280 q.queue = xcalloc(num_paths, sizeof(struct diff_filepair *));
1281 q.alloc = num_paths;
1282 q.nr = num_paths;
1283 for (i = 0, p = paths; p; p = p->next) {
1284 if (!p->len)
1285 continue;
1286 q.queue[i++] = combined_pair(p, num_parent);
1287 }
1288 opt->format_callback(&q, opt, opt->format_callback_data);
1289 for (i = 0; i < num_paths; i++)
1290 free_combined_pair(q.queue[i]);
1291 free(q.queue);
1292 }
1293
1294 void diff_tree_combined(const unsigned char *sha1,
1295 const struct sha1_array *parents,
1296 int dense,
1297 struct rev_info *rev)
1298 {
1299 struct diff_options *opt = &rev->diffopt;
1300 struct diff_options diffopts;
1301 struct combine_diff_path *p, *paths = NULL;
1302 int i, num_paths, needsep, show_log_first, num_parent = parents->nr;
1303
1304 diffopts = *opt;
1305 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
1306 DIFF_OPT_SET(&diffopts, RECURSIVE);
1307 DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
1308
1309 show_log_first = !!rev->loginfo && !rev->no_commit_id;
1310 needsep = 0;
1311 /* find set of paths that everybody touches */
1312 for (i = 0; i < num_parent; i++) {
1313 /* show stat against the first parent even
1314 * when doing combined diff.
1315 */
1316 int stat_opt = (opt->output_format &
1317 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
1318 if (i == 0 && stat_opt)
1319 diffopts.output_format = stat_opt;
1320 else
1321 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
1322 diff_tree_sha1(parents->sha1[i], sha1, "", &diffopts);
1323 diffcore_std(&diffopts);
1324 paths = intersect_paths(paths, i, num_parent);
1325
1326 if (show_log_first && i == 0) {
1327 show_log(rev);
1328
1329 if (rev->verbose_header && opt->output_format)
1330 printf("%s%c", diff_line_prefix(opt),
1331 opt->line_termination);
1332 }
1333 diff_flush(&diffopts);
1334 }
1335
1336 /* find out surviving paths */
1337 for (num_paths = 0, p = paths; p; p = p->next) {
1338 if (p->len)
1339 num_paths++;
1340 }
1341 if (num_paths) {
1342 if (opt->output_format & (DIFF_FORMAT_RAW |
1343 DIFF_FORMAT_NAME |
1344 DIFF_FORMAT_NAME_STATUS)) {
1345 for (p = paths; p; p = p->next) {
1346 if (p->len)
1347 show_raw_diff(p, num_parent, rev);
1348 }
1349 needsep = 1;
1350 }
1351 else if (opt->output_format &
1352 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT))
1353 needsep = 1;
1354 else if (opt->output_format & DIFF_FORMAT_CALLBACK)
1355 handle_combined_callback(opt, paths, num_parent, num_paths);
1356
1357 if (opt->output_format & DIFF_FORMAT_PATCH) {
1358 if (needsep)
1359 printf("%s%c", diff_line_prefix(opt),
1360 opt->line_termination);
1361 for (p = paths; p; p = p->next) {
1362 if (p->len)
1363 show_patch_diff(p, num_parent, dense,
1364 0, rev);
1365 }
1366 }
1367 }
1368
1369 /* Clean things up */
1370 while (paths) {
1371 struct combine_diff_path *tmp = paths;
1372 paths = paths->next;
1373 free(tmp);
1374 }
1375 }
1376
1377 void diff_tree_combined_merge(const struct commit *commit, int dense,
1378 struct rev_info *rev)
1379 {
1380 struct commit_list *parent = commit->parents;
1381 struct sha1_array parents = SHA1_ARRAY_INIT;
1382
1383 while (parent) {
1384 sha1_array_append(&parents, parent->item->object.sha1);
1385 parent = parent->next;
1386 }
1387 diff_tree_combined(commit->object.sha1, &parents, dense, rev);
1388 sha1_array_clear(&parents);
1389 }
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