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Merge branch 'jn/gitweb-split-header-html'
[git/gitweb.git] / combine-diff.c
blobbe67cfcd45469497f81e0c36ed87a11fd409daee
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 #include "userdiff.h"
11
12 static struct combine_diff_path *intersect_paths(struct combine_diff_path *curr, int n, int num_parent)
13 {
14 struct diff_queue_struct *q = &diff_queued_diff;
15 struct combine_diff_path *p;
16 int i;
17
18 if (!n) {
19 struct combine_diff_path *list = NULL, **tail = &list;
20 for (i = 0; i < q->nr; i++) {
21 int len;
22 const char *path;
23 if (diff_unmodified_pair(q->queue[i]))
24 continue;
25 path = q->queue[i]->two->path;
26 len = strlen(path);
27 p = xmalloc(combine_diff_path_size(num_parent, len));
28 p->path = (char *) &(p->parent[num_parent]);
29 memcpy(p->path, path, len);
30 p->path[len] = 0;
31 p->len = len;
32 p->next = NULL;
33 memset(p->parent, 0,
34 sizeof(p->parent[0]) * num_parent);
35
36 hashcpy(p->sha1, q->queue[i]->two->sha1);
37 p->mode = q->queue[i]->two->mode;
38 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
39 p->parent[n].mode = q->queue[i]->one->mode;
40 p->parent[n].status = q->queue[i]->status;
41 *tail = p;
42 tail = &p->next;
43 }
44 return list;
45 }
46
47 for (p = curr; p; p = p->next) {
48 int found = 0;
49 if (!p->len)
50 continue;
51 for (i = 0; i < q->nr; i++) {
52 const char *path;
53 int len;
54
55 if (diff_unmodified_pair(q->queue[i]))
56 continue;
57 path = q->queue[i]->two->path;
58 len = strlen(path);
59 if (len == p->len && !memcmp(path, p->path, len)) {
60 found = 1;
61 hashcpy(p->parent[n].sha1, q->queue[i]->one->sha1);
62 p->parent[n].mode = q->queue[i]->one->mode;
63 p->parent[n].status = q->queue[i]->status;
64 break;
65 }
66 }
67 if (!found)
68 p->len = 0;
69 }
70 return curr;
71 }
72
73 /* Lines lost from parent */
74 struct lline {
75 struct lline *next;
76 int len;
77 unsigned long parent_map;
78 char line[FLEX_ARRAY];
79 };
80
81 /* Lines surviving in the merge result */
82 struct sline {
83 struct lline *lost_head, **lost_tail;
84 struct lline *next_lost;
85 char *bol;
86 int len;
87 /* bit 0 up to (N-1) are on if the parent has this line (i.e.
88 * we did not change it).
89 * bit N is used for "interesting" lines, including context.
90 * bit (N+1) is used for "do not show deletion before this".
91 */
92 unsigned long flag;
93 unsigned long *p_lno;
94 };
95
96 static char *grab_blob(const unsigned char *sha1, unsigned int mode,
97 unsigned long *size, struct userdiff_driver *textconv,
98 const char *path)
99 {
100 char *blob;
101 enum object_type type;
102
103 if (S_ISGITLINK(mode)) {
104 blob = xmalloc(100);
105 *size = snprintf(blob, 100,
106 "Subproject commit %s\n", sha1_to_hex(sha1));
107 } else if (is_null_sha1(sha1)) {
108 /* deleted blob */
109 *size = 0;
110 return xcalloc(1, 1);
111 } else if (textconv) {
112 struct diff_filespec *df = alloc_filespec(path);
113 fill_filespec(df, sha1, mode);
114 *size = fill_textconv(textconv, df, &blob);
115 free_filespec(df);
116 } else {
117 blob = read_sha1_file(sha1, &type, size);
118 if (type != OBJ_BLOB)
119 die("object '%s' is not a blob!", sha1_to_hex(sha1));
120 }
121 return blob;
122 }
123
124 static void append_lost(struct sline *sline, int n, const char *line, int len)
125 {
126 struct lline *lline;
127 unsigned long this_mask = (1UL<<n);
128 if (line[len-1] == '\n')
129 len--;
130
131 /* Check to see if we can squash things */
132 if (sline->lost_head) {
133 lline = sline->next_lost;
134 while (lline) {
135 if (lline->len == len &&
136 !memcmp(lline->line, line, len)) {
137 lline->parent_map |= this_mask;
138 sline->next_lost = lline->next;
139 return;
140 }
141 lline = lline->next;
142 }
143 }
144
145 lline = xmalloc(sizeof(*lline) + len + 1);
146 lline->len = len;
147 lline->next = NULL;
148 lline->parent_map = this_mask;
149 memcpy(lline->line, line, len);
150 lline->line[len] = 0;
151 *sline->lost_tail = lline;
152 sline->lost_tail = &lline->next;
153 sline->next_lost = NULL;
154 }
155
156 struct combine_diff_state {
157 unsigned int lno;
158 int ob, on, nb, nn;
159 unsigned long nmask;
160 int num_parent;
161 int n;
162 struct sline *sline;
163 struct sline *lost_bucket;
164 };
165
166 static void consume_line(void *state_, char *line, unsigned long len)
167 {
168 struct combine_diff_state *state = state_;
169 if (5 < len && !memcmp("@@ -", line, 4)) {
170 if (parse_hunk_header(line, len,
171 &state->ob, &state->on,
172 &state->nb, &state->nn))
173 return;
174 state->lno = state->nb;
175 if (state->nn == 0) {
176 /* @@ -X,Y +N,0 @@ removed Y lines
177 * that would have come *after* line N
178 * in the result. Our lost buckets hang
179 * to the line after the removed lines,
180 *
181 * Note that this is correct even when N == 0,
182 * in which case the hunk removes the first
183 * line in the file.
184 */
185 state->lost_bucket = &state->sline[state->nb];
186 if (!state->nb)
187 state->nb = 1;
188 } else {
189 state->lost_bucket = &state->sline[state->nb-1];
190 }
191 if (!state->sline[state->nb-1].p_lno)
192 state->sline[state->nb-1].p_lno =
193 xcalloc(state->num_parent,
194 sizeof(unsigned long));
195 state->sline[state->nb-1].p_lno[state->n] = state->ob;
196 state->lost_bucket->next_lost = state->lost_bucket->lost_head;
197 return;
198 }
199 if (!state->lost_bucket)
200 return; /* not in any hunk yet */
201 switch (line[0]) {
202 case '-':
203 append_lost(state->lost_bucket, state->n, line+1, len-1);
204 break;
205 case '+':
206 state->sline[state->lno-1].flag |= state->nmask;
207 state->lno++;
208 break;
209 }
210 }
211
212 static void combine_diff(const unsigned char *parent, unsigned int mode,
213 mmfile_t *result_file,
214 struct sline *sline, unsigned int cnt, int n,
215 int num_parent, int result_deleted,
216 struct userdiff_driver *textconv,
217 const char *path)
218 {
219 unsigned int p_lno, lno;
220 unsigned long nmask = (1UL << n);
221 xpparam_t xpp;
222 xdemitconf_t xecfg;
223 mmfile_t parent_file;
224 struct combine_diff_state state;
225 unsigned long sz;
226
227 if (result_deleted)
228 return; /* result deleted */
229
230 parent_file.ptr = grab_blob(parent, mode, &sz, textconv, path);
231 parent_file.size = sz;
232 memset(&xpp, 0, sizeof(xpp));
233 xpp.flags = 0;
234 memset(&xecfg, 0, sizeof(xecfg));
235 memset(&state, 0, sizeof(state));
236 state.nmask = nmask;
237 state.sline = sline;
238 state.lno = 1;
239 state.num_parent = num_parent;
240 state.n = n;
241
242 xdi_diff_outf(&parent_file, result_file, consume_line, &state,
243 &xpp, &xecfg);
244 free(parent_file.ptr);
245
246 /* Assign line numbers for this parent.
247 *
248 * sline[lno].p_lno[n] records the first line number
249 * (counting from 1) for parent N if the final hunk display
250 * started by showing sline[lno] (possibly showing the lost
251 * lines attached to it first).
252 */
253 for (lno = 0, p_lno = 1; lno <= cnt; lno++) {
254 struct lline *ll;
255 sline[lno].p_lno[n] = p_lno;
256
257 /* How many lines would this sline advance the p_lno? */
258 ll = sline[lno].lost_head;
259 while (ll) {
260 if (ll->parent_map & nmask)
261 p_lno++; /* '-' means parent had it */
262 ll = ll->next;
263 }
264 if (lno < cnt && !(sline[lno].flag & nmask))
265 p_lno++; /* no '+' means parent had it */
266 }
267 sline[lno].p_lno[n] = p_lno; /* trailer */
268 }
269
270 static unsigned long context = 3;
271 static char combine_marker = '@';
272
273 static int interesting(struct sline *sline, unsigned long all_mask)
274 {
275 /* If some parents lost lines here, or if we have added to
276 * some parent, it is interesting.
277 */
278 return ((sline->flag & all_mask) || sline->lost_head);
279 }
280
281 static unsigned long adjust_hunk_tail(struct sline *sline,
282 unsigned long all_mask,
283 unsigned long hunk_begin,
284 unsigned long i)
285 {
286 /* i points at the first uninteresting line. If the last line
287 * of the hunk was interesting only because it has some
288 * deletion, then it is not all that interesting for the
289 * purpose of giving trailing context lines. This is because
290 * we output '-' line and then unmodified sline[i-1] itself in
291 * that case which gives us one extra context line.
292 */
293 if ((hunk_begin + 1 <= i) && !(sline[i-1].flag & all_mask))
294 i--;
295 return i;
296 }
297
298 static unsigned long find_next(struct sline *sline,
299 unsigned long mark,
300 unsigned long i,
301 unsigned long cnt,
302 int look_for_uninteresting)
303 {
304 /* We have examined up to i-1 and are about to look at i.
305 * Find next interesting or uninteresting line. Here,
306 * "interesting" does not mean interesting(), but marked by
307 * the give_context() function below (i.e. it includes context
308 * lines that are not interesting to interesting() function
309 * that are surrounded by interesting() ones.
310 */
311 while (i <= cnt)
312 if (look_for_uninteresting
313 ? !(sline[i].flag & mark)
314 : (sline[i].flag & mark))
315 return i;
316 else
317 i++;
318 return i;
319 }
320
321 static int give_context(struct sline *sline, unsigned long cnt, int num_parent)
322 {
323 unsigned long all_mask = (1UL<<num_parent) - 1;
324 unsigned long mark = (1UL<<num_parent);
325 unsigned long no_pre_delete = (2UL<<num_parent);
326 unsigned long i;
327
328 /* Two groups of interesting lines may have a short gap of
329 * uninteresting lines. Connect such groups to give them a
330 * bit of context.
331 *
332 * We first start from what the interesting() function says,
333 * and mark them with "mark", and paint context lines with the
334 * mark. So interesting() would still say false for such context
335 * lines but they are treated as "interesting" in the end.
336 */
337 i = find_next(sline, mark, 0, cnt, 0);
338 if (cnt < i)
339 return 0;
340
341 while (i <= cnt) {
342 unsigned long j = (context < i) ? (i - context) : 0;
343 unsigned long k;
344
345 /* Paint a few lines before the first interesting line. */
346 while (j < i)
347 sline[j++].flag |= mark | no_pre_delete;
348
349 again:
350 /* we know up to i is to be included. where does the
351 * next uninteresting one start?
352 */
353 j = find_next(sline, mark, i, cnt, 1);
354 if (cnt < j)
355 break; /* the rest are all interesting */
356
357 /* lookahead context lines */
358 k = find_next(sline, mark, j, cnt, 0);
359 j = adjust_hunk_tail(sline, all_mask, i, j);
360
361 if (k < j + context) {
362 /* k is interesting and [j,k) are not, but
363 * paint them interesting because the gap is small.
364 */
365 while (j < k)
366 sline[j++].flag |= mark;
367 i = k;
368 goto again;
369 }
370
371 /* j is the first uninteresting line and there is
372 * no overlap beyond it within context lines. Paint
373 * the trailing edge a bit.
374 */
375 i = k;
376 k = (j + context < cnt+1) ? j + context : cnt+1;
377 while (j < k)
378 sline[j++].flag |= mark;
379 }
380 return 1;
381 }
382
383 static int make_hunks(struct sline *sline, unsigned long cnt,
384 int num_parent, int dense)
385 {
386 unsigned long all_mask = (1UL<<num_parent) - 1;
387 unsigned long mark = (1UL<<num_parent);
388 unsigned long i;
389 int has_interesting = 0;
390
391 for (i = 0; i <= cnt; i++) {
392 if (interesting(&sline[i], all_mask))
393 sline[i].flag |= mark;
394 else
395 sline[i].flag &= ~mark;
396 }
397 if (!dense)
398 return give_context(sline, cnt, num_parent);
399
400 /* Look at each hunk, and if we have changes from only one
401 * parent, or the changes are the same from all but one
402 * parent, mark that uninteresting.
403 */
404 i = 0;
405 while (i <= cnt) {
406 unsigned long j, hunk_begin, hunk_end;
407 unsigned long same_diff;
408 while (i <= cnt && !(sline[i].flag & mark))
409 i++;
410 if (cnt < i)
411 break; /* No more interesting hunks */
412 hunk_begin = i;
413 for (j = i + 1; j <= cnt; j++) {
414 if (!(sline[j].flag & mark)) {
415 /* Look beyond the end to see if there
416 * is an interesting line after this
417 * hunk within context span.
418 */
419 unsigned long la; /* lookahead */
420 int contin = 0;
421 la = adjust_hunk_tail(sline, all_mask,
422 hunk_begin, j);
423 la = (la + context < cnt + 1) ?
424 (la + context) : cnt + 1;
425 while (j <= --la) {
426 if (sline[la].flag & mark) {
427 contin = 1;
428 break;
429 }
430 }
431 if (!contin)
432 break;
433 j = la;
434 }
435 }
436 hunk_end = j;
437
438 /* [i..hunk_end) are interesting. Now is it really
439 * interesting? We check if there are only two versions
440 * and the result matches one of them. That is, we look
441 * at:
442 * (+) line, which records lines added to which parents;
443 * this line appears in the result.
444 * (-) line, which records from what parents the line
445 * was removed; this line does not appear in the result.
446 * then check the set of parents the result has difference
447 * from, from all lines. If there are lines that has
448 * different set of parents that the result has differences
449 * from, that means we have more than two versions.
450 *
451 * Even when we have only two versions, if the result does
452 * not match any of the parents, the it should be considered
453 * interesting. In such a case, we would have all '+' line.
454 * After passing the above "two versions" test, that would
455 * appear as "the same set of parents" to be "all parents".
456 */
457 same_diff = 0;
458 has_interesting = 0;
459 for (j = i; j < hunk_end && !has_interesting; j++) {
460 unsigned long this_diff = sline[j].flag & all_mask;
461 struct lline *ll = sline[j].lost_head;
462 if (this_diff) {
463 /* This has some changes. Is it the
464 * same as others?
465 */
466 if (!same_diff)
467 same_diff = this_diff;
468 else if (same_diff != this_diff) {
469 has_interesting = 1;
470 break;
471 }
472 }
473 while (ll && !has_interesting) {
474 /* Lost this line from these parents;
475 * who are they? Are they the same?
476 */
477 this_diff = ll->parent_map;
478 if (!same_diff)
479 same_diff = this_diff;
480 else if (same_diff != this_diff) {
481 has_interesting = 1;
482 }
483 ll = ll->next;
484 }
485 }
486
487 if (!has_interesting && same_diff != all_mask) {
488 /* This hunk is not that interesting after all */
489 for (j = hunk_begin; j < hunk_end; j++)
490 sline[j].flag &= ~mark;
491 }
492 i = hunk_end;
493 }
494
495 has_interesting = give_context(sline, cnt, num_parent);
496 return has_interesting;
497 }
498
499 static void show_parent_lno(struct sline *sline, unsigned long l0, unsigned long l1, int n, unsigned long null_context)
500 {
501 l0 = sline[l0].p_lno[n];
502 l1 = sline[l1].p_lno[n];
503 printf(" -%lu,%lu", l0, l1-l0-null_context);
504 }
505
506 static int hunk_comment_line(const char *bol)
507 {
508 int ch;
509
510 if (!bol)
511 return 0;
512 ch = *bol & 0xff;
513 return (isalpha(ch) || ch == '_' || ch == '$');
514 }
515
516 static void show_line_to_eol(const char *line, int len, const char *reset)
517 {
518 int saw_cr_at_eol = 0;
519 if (len < 0)
520 len = strlen(line);
521 saw_cr_at_eol = (len && line[len-1] == '\r');
522
523 printf("%.*s%s%s\n", len - saw_cr_at_eol, line,
524 reset,
525 saw_cr_at_eol ? "\r" : "");
526 }
527
528 static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
529 int use_color, int result_deleted)
530 {
531 unsigned long mark = (1UL<<num_parent);
532 unsigned long no_pre_delete = (2UL<<num_parent);
533 int i;
534 unsigned long lno = 0;
535 const char *c_frag = diff_get_color(use_color, DIFF_FRAGINFO);
536 const char *c_func = diff_get_color(use_color, DIFF_FUNCINFO);
537 const char *c_new = diff_get_color(use_color, DIFF_FILE_NEW);
538 const char *c_old = diff_get_color(use_color, DIFF_FILE_OLD);
539 const char *c_plain = diff_get_color(use_color, DIFF_PLAIN);
540 const char *c_reset = diff_get_color(use_color, DIFF_RESET);
541
542 if (result_deleted)
543 return; /* result deleted */
544
545 while (1) {
546 unsigned long hunk_end;
547 unsigned long rlines;
548 const char *hunk_comment = NULL;
549 unsigned long null_context = 0;
550
551 while (lno <= cnt && !(sline[lno].flag & mark)) {
552 if (hunk_comment_line(sline[lno].bol))
553 hunk_comment = sline[lno].bol;
554 lno++;
555 }
556 if (cnt < lno)
557 break;
558 else {
559 for (hunk_end = lno + 1; hunk_end <= cnt; hunk_end++)
560 if (!(sline[hunk_end].flag & mark))
561 break;
562 }
563 rlines = hunk_end - lno;
564 if (cnt < hunk_end)
565 rlines--; /* pointing at the last delete hunk */
566
567 if (!context) {
568 /*
569 * Even when running with --unified=0, all
570 * lines in the hunk needs to be processed in
571 * the loop below in order to show the
572 * deletion recorded in lost_head. However,
573 * we do not want to show the resulting line
574 * with all blank context markers in such a
575 * case. Compensate.
576 */
577 unsigned long j;
578 for (j = lno; j < hunk_end; j++)
579 if (!(sline[j].flag & (mark-1)))
580 null_context++;
581 rlines -= null_context;
582 }
583
584 fputs(c_frag, stdout);
585 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
586 for (i = 0; i < num_parent; i++)
587 show_parent_lno(sline, lno, hunk_end, i, null_context);
588 printf(" +%lu,%lu ", lno+1, rlines);
589 for (i = 0; i <= num_parent; i++) putchar(combine_marker);
590
591 if (hunk_comment) {
592 int comment_end = 0;
593 for (i = 0; i < 40; i++) {
594 int ch = hunk_comment[i] & 0xff;
595 if (!ch || ch == '\n')
596 break;
597 if (!isspace(ch))
598 comment_end = i;
599 }
600 if (comment_end)
601 printf("%s%s %s%s", c_reset,
602 c_plain, c_reset,
603 c_func);
604 for (i = 0; i < comment_end; i++)
605 putchar(hunk_comment[i]);
606 }
607
608 printf("%s\n", c_reset);
609 while (lno < hunk_end) {
610 struct lline *ll;
611 int j;
612 unsigned long p_mask;
613 struct sline *sl = &sline[lno++];
614 ll = (sl->flag & no_pre_delete) ? NULL : sl->lost_head;
615 while (ll) {
616 fputs(c_old, stdout);
617 for (j = 0; j < num_parent; j++) {
618 if (ll->parent_map & (1UL<<j))
619 putchar('-');
620 else
621 putchar(' ');
622 }
623 show_line_to_eol(ll->line, -1, c_reset);
624 ll = ll->next;
625 }
626 if (cnt < lno)
627 break;
628 p_mask = 1;
629 if (!(sl->flag & (mark-1))) {
630 /*
631 * This sline was here to hang the
632 * lost lines in front of it.
633 */
634 if (!context)
635 continue;
636 fputs(c_plain, stdout);
637 }
638 else
639 fputs(c_new, stdout);
640 for (j = 0; j < num_parent; j++) {
641 if (p_mask & sl->flag)
642 putchar('+');
643 else
644 putchar(' ');
645 p_mask <<= 1;
646 }
647 show_line_to_eol(sl->bol, sl->len, c_reset);
648 }
649 }
650 }
651
652 static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
653 int i, int j)
654 {
655 /* We have already examined parent j and we know parent i
656 * and parent j are the same, so reuse the combined result
657 * of parent j for parent i.
658 */
659 unsigned long lno, imask, jmask;
660 imask = (1UL<<i);
661 jmask = (1UL<<j);
662
663 for (lno = 0; lno <= cnt; lno++) {
664 struct lline *ll = sline->lost_head;
665 sline->p_lno[i] = sline->p_lno[j];
666 while (ll) {
667 if (ll->parent_map & jmask)
668 ll->parent_map |= imask;
669 ll = ll->next;
670 }
671 if (sline->flag & jmask)
672 sline->flag |= imask;
673 sline++;
674 }
675 /* the overall size of the file (sline[cnt]) */
676 sline->p_lno[i] = sline->p_lno[j];
677 }
678
679 static void dump_quoted_path(const char *head,
680 const char *prefix,
681 const char *path,
682 const char *c_meta, const char *c_reset)
683 {
684 static struct strbuf buf = STRBUF_INIT;
685
686 strbuf_reset(&buf);
687 strbuf_addstr(&buf, c_meta);
688 strbuf_addstr(&buf, head);
689 quote_two_c_style(&buf, prefix, path, 0);
690 strbuf_addstr(&buf, c_reset);
691 puts(buf.buf);
692 }
693
694 static void show_combined_header(struct combine_diff_path *elem,
695 int num_parent,
696 int dense,
697 struct rev_info *rev,
698 int mode_differs,
699 int show_file_header)
700 {
701 struct diff_options *opt = &rev->diffopt;
702 int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
703 const char *a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
704 const char *b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
705 int use_color = DIFF_OPT_TST(opt, COLOR_DIFF);
706 const char *c_meta = diff_get_color(use_color, DIFF_METAINFO);
707 const char *c_reset = diff_get_color(use_color, DIFF_RESET);
708 const char *abb;
709 int added = 0;
710 int deleted = 0;
711 int i;
712
713 if (rev->loginfo && !rev->no_commit_id)
714 show_log(rev);
715
716 dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
717 "", elem->path, c_meta, c_reset);
718 printf("%sindex ", c_meta);
719 for (i = 0; i < num_parent; i++) {
720 abb = find_unique_abbrev(elem->parent[i].sha1,
721 abbrev);
722 printf("%s%s", i ? "," : "", abb);
723 }
724 abb = find_unique_abbrev(elem->sha1, abbrev);
725 printf("..%s%s\n", abb, c_reset);
726
727 if (mode_differs) {
728 deleted = !elem->mode;
729
730 /* We say it was added if nobody had it */
731 added = !deleted;
732 for (i = 0; added && i < num_parent; i++)
733 if (elem->parent[i].status !=
734 DIFF_STATUS_ADDED)
735 added = 0;
736 if (added)
737 printf("%snew file mode %06o",
738 c_meta, elem->mode);
739 else {
740 if (deleted)
741 printf("%sdeleted file ", c_meta);
742 printf("mode ");
743 for (i = 0; i < num_parent; i++) {
744 printf("%s%06o", i ? "," : "",
745 elem->parent[i].mode);
746 }
747 if (elem->mode)
748 printf("..%06o", elem->mode);
749 }
750 printf("%s\n", c_reset);
751 }
752
753 if (!show_file_header)
754 return;
755
756 if (added)
757 dump_quoted_path("--- ", "", "/dev/null",
758 c_meta, c_reset);
759 else
760 dump_quoted_path("--- ", a_prefix, elem->path,
761 c_meta, c_reset);
762 if (deleted)
763 dump_quoted_path("+++ ", "", "/dev/null",
764 c_meta, c_reset);
765 else
766 dump_quoted_path("+++ ", b_prefix, elem->path,
767 c_meta, c_reset);
768 }
769
770 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
771 int dense, struct rev_info *rev)
772 {
773 struct diff_options *opt = &rev->diffopt;
774 unsigned long result_size, cnt, lno;
775 int result_deleted = 0;
776 char *result, *cp;
777 struct sline *sline; /* survived lines */
778 int mode_differs = 0;
779 int i, show_hunks;
780 int working_tree_file = is_null_sha1(elem->sha1);
781 mmfile_t result_file;
782 struct userdiff_driver *userdiff;
783 struct userdiff_driver *textconv = NULL;
784 int is_binary;
785
786 context = opt->context;
787 userdiff = userdiff_find_by_path(elem->path);
788 if (!userdiff)
789 userdiff = userdiff_find_by_name("default");
790 if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV))
791 textconv = userdiff_get_textconv(userdiff);
792
793 /* Read the result of merge first */
794 if (!working_tree_file)
795 result = grab_blob(elem->sha1, elem->mode, &result_size,
796 textconv, elem->path);
797 else {
798 /* Used by diff-tree to read from the working tree */
799 struct stat st;
800 int fd = -1;
801
802 if (lstat(elem->path, &st) < 0)
803 goto deleted_file;
804
805 if (S_ISLNK(st.st_mode)) {
806 struct strbuf buf = STRBUF_INIT;
807
808 if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
809 error("readlink(%s): %s", elem->path,
810 strerror(errno));
811 return;
812 }
813 result_size = buf.len;
814 result = strbuf_detach(&buf, NULL);
815 elem->mode = canon_mode(st.st_mode);
816 } else if (S_ISDIR(st.st_mode)) {
817 unsigned char sha1[20];
818 if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
819 result = grab_blob(elem->sha1, elem->mode,
820 &result_size, NULL, NULL);
821 else
822 result = grab_blob(sha1, elem->mode,
823 &result_size, NULL, NULL);
824 } else if (textconv) {
825 struct diff_filespec *df = alloc_filespec(elem->path);
826 fill_filespec(df, null_sha1, st.st_mode);
827 result_size = fill_textconv(textconv, df, &result);
828 free_filespec(df);
829 } else if (0 <= (fd = open(elem->path, O_RDONLY))) {
830 size_t len = xsize_t(st.st_size);
831 ssize_t done;
832 int is_file, i;
833
834 elem->mode = canon_mode(st.st_mode);
835 /* if symlinks don't work, assume symlink if all parents
836 * are symlinks
837 */
838 is_file = has_symlinks;
839 for (i = 0; !is_file && i < num_parent; i++)
840 is_file = !S_ISLNK(elem->parent[i].mode);
841 if (!is_file)
842 elem->mode = canon_mode(S_IFLNK);
843
844 result_size = len;
845 result = xmalloc(len + 1);
846
847 done = read_in_full(fd, result, len);
848 if (done < 0)
849 die_errno("read error '%s'", elem->path);
850 else if (done < len)
851 die("early EOF '%s'", elem->path);
852
853 result[len] = 0;
854
855 /* If not a fake symlink, apply filters, e.g. autocrlf */
856 if (is_file) {
857 struct strbuf buf = STRBUF_INIT;
858
859 if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
860 free(result);
861 result = strbuf_detach(&buf, &len);
862 result_size = len;
863 }
864 }
865 }
866 else {
867 deleted_file:
868 result_deleted = 1;
869 result_size = 0;
870 elem->mode = 0;
871 result = xcalloc(1, 1);
872 }
873
874 if (0 <= fd)
875 close(fd);
876 }
877
878 for (i = 0; i < num_parent; i++) {
879 if (elem->parent[i].mode != elem->mode) {
880 mode_differs = 1;
881 break;
882 }
883 }
884
885 if (textconv)
886 is_binary = 0;
887 else if (userdiff->binary != -1)
888 is_binary = userdiff->binary;
889 else {
890 is_binary = buffer_is_binary(result, result_size);
891 for (i = 0; !is_binary && i < num_parent; i++) {
892 char *buf;
893 unsigned long size;
894 buf = grab_blob(elem->parent[i].sha1,
895 elem->parent[i].mode,
896 &size, NULL, NULL);
897 if (buffer_is_binary(buf, size))
898 is_binary = 1;
899 free(buf);
900 }
901 }
902 if (is_binary) {
903 show_combined_header(elem, num_parent, dense, rev,
904 mode_differs, 0);
905 printf("Binary files differ\n");
906 free(result);
907 return;
908 }
909
910 for (cnt = 0, cp = result; cp < result + result_size; cp++) {
911 if (*cp == '\n')
912 cnt++;
913 }
914 if (result_size && result[result_size-1] != '\n')
915 cnt++; /* incomplete line */
916
917 sline = xcalloc(cnt+2, sizeof(*sline));
918 sline[0].bol = result;
919 for (lno = 0; lno <= cnt + 1; lno++) {
920 sline[lno].lost_tail = &sline[lno].lost_head;
921 sline[lno].flag = 0;
922 }
923 for (lno = 0, cp = result; cp < result + result_size; cp++) {
924 if (*cp == '\n') {
925 sline[lno].len = cp - sline[lno].bol;
926 lno++;
927 if (lno < cnt)
928 sline[lno].bol = cp + 1;
929 }
930 }
931 if (result_size && result[result_size-1] != '\n')
932 sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
933
934 result_file.ptr = result;
935 result_file.size = result_size;
936
937 /* Even p_lno[cnt+1] is valid -- that is for the end line number
938 * for deletion hunk at the end.
939 */
940 sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
941 for (lno = 0; lno <= cnt; lno++)
942 sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
943
944 for (i = 0; i < num_parent; i++) {
945 int j;
946 for (j = 0; j < i; j++) {
947 if (!hashcmp(elem->parent[i].sha1,
948 elem->parent[j].sha1)) {
949 reuse_combine_diff(sline, cnt, i, j);
950 break;
951 }
952 }
953 if (i <= j)
954 combine_diff(elem->parent[i].sha1,
955 elem->parent[i].mode,
956 &result_file, sline,
957 cnt, i, num_parent, result_deleted,
958 textconv, elem->path);
959 }
960
961 show_hunks = make_hunks(sline, cnt, num_parent, dense);
962
963 if (show_hunks || mode_differs || working_tree_file) {
964 show_combined_header(elem, num_parent, dense, rev,
965 mode_differs, 1);
966 dump_sline(sline, cnt, num_parent,
967 DIFF_OPT_TST(opt, COLOR_DIFF), result_deleted);
968 }
969 free(result);
970
971 for (lno = 0; lno < cnt; lno++) {
972 if (sline[lno].lost_head) {
973 struct lline *ll = sline[lno].lost_head;
974 while (ll) {
975 struct lline *tmp = ll;
976 ll = ll->next;
977 free(tmp);
978 }
979 }
980 }
981 free(sline[0].p_lno);
982 free(sline);
983 }
984
985 #define COLONS "::::::::::::::::::::::::::::::::"
986
987 static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct rev_info *rev)
988 {
989 struct diff_options *opt = &rev->diffopt;
990 int i, offset;
991 const char *prefix;
992 int line_termination, inter_name_termination;
993
994 line_termination = opt->line_termination;
995 inter_name_termination = '\t';
996 if (!line_termination)
997 inter_name_termination = 0;
998
999 if (rev->loginfo && !rev->no_commit_id)
1000 show_log(rev);
1001
1002 if (opt->output_format & DIFF_FORMAT_RAW) {
1003 offset = strlen(COLONS) - num_parent;
1004 if (offset < 0)
1005 offset = 0;
1006 prefix = COLONS + offset;
1007
1008 /* Show the modes */
1009 for (i = 0; i < num_parent; i++) {
1010 printf("%s%06o", prefix, p->parent[i].mode);
1011 prefix = " ";
1012 }
1013 printf("%s%06o", prefix, p->mode);
1014
1015 /* Show sha1's */
1016 for (i = 0; i < num_parent; i++)
1017 printf(" %s", diff_unique_abbrev(p->parent[i].sha1,
1018 opt->abbrev));
1019 printf(" %s ", diff_unique_abbrev(p->sha1, opt->abbrev));
1020 }
1021
1022 if (opt->output_format & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS)) {
1023 for (i = 0; i < num_parent; i++)
1024 putchar(p->parent[i].status);
1025 putchar(inter_name_termination);
1026 }
1027
1028 write_name_quoted(p->path, stdout, line_termination);
1029 }
1030
1031 void show_combined_diff(struct combine_diff_path *p,
1032 int num_parent,
1033 int dense,
1034 struct rev_info *rev)
1035 {
1036 struct diff_options *opt = &rev->diffopt;
1037 if (!p->len)
1038 return;
1039 if (opt->output_format & (DIFF_FORMAT_RAW |
1040 DIFF_FORMAT_NAME |
1041 DIFF_FORMAT_NAME_STATUS))
1042 show_raw_diff(p, num_parent, rev);
1043 else if (opt->output_format & DIFF_FORMAT_PATCH)
1044 show_patch_diff(p, num_parent, dense, rev);
1045 }
1046
1047 void diff_tree_combined(const unsigned char *sha1,
1048 const unsigned char parent[][20],
1049 int num_parent,
1050 int dense,
1051 struct rev_info *rev)
1052 {
1053 struct diff_options *opt = &rev->diffopt;
1054 struct diff_options diffopts;
1055 struct combine_diff_path *p, *paths = NULL;
1056 int i, num_paths, needsep, show_log_first;
1057
1058 diffopts = *opt;
1059 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
1060 DIFF_OPT_SET(&diffopts, RECURSIVE);
1061 DIFF_OPT_CLR(&diffopts, ALLOW_EXTERNAL);
1062
1063 show_log_first = !!rev->loginfo && !rev->no_commit_id;
1064 needsep = 0;
1065 /* find set of paths that everybody touches */
1066 for (i = 0; i < num_parent; i++) {
1067 /* show stat against the first parent even
1068 * when doing combined diff.
1069 */
1070 int stat_opt = (opt->output_format &
1071 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT));
1072 if (i == 0 && stat_opt)
1073 diffopts.output_format = stat_opt;
1074 else
1075 diffopts.output_format = DIFF_FORMAT_NO_OUTPUT;
1076 diff_tree_sha1(parent[i], sha1, "", &diffopts);
1077 diffcore_std(&diffopts);
1078 paths = intersect_paths(paths, i, num_parent);
1079
1080 if (show_log_first && i == 0) {
1081 show_log(rev);
1082 if (rev->verbose_header && opt->output_format)
1083 putchar(opt->line_termination);
1084 }
1085 diff_flush(&diffopts);
1086 }
1087
1088 /* find out surviving paths */
1089 for (num_paths = 0, p = paths; p; p = p->next) {
1090 if (p->len)
1091 num_paths++;
1092 }
1093 if (num_paths) {
1094 if (opt->output_format & (DIFF_FORMAT_RAW |
1095 DIFF_FORMAT_NAME |
1096 DIFF_FORMAT_NAME_STATUS)) {
1097 for (p = paths; p; p = p->next) {
1098 if (p->len)
1099 show_raw_diff(p, num_parent, rev);
1100 }
1101 needsep = 1;
1102 }
1103 else if (opt->output_format &
1104 (DIFF_FORMAT_NUMSTAT|DIFF_FORMAT_DIFFSTAT))
1105 needsep = 1;
1106 if (opt->output_format & DIFF_FORMAT_PATCH) {
1107 if (needsep)
1108 putchar(opt->line_termination);
1109 for (p = paths; p; p = p->next) {
1110 if (p->len)
1111 show_patch_diff(p, num_parent, dense,
1112 rev);
1113 }
1114 }
1115 }
1116
1117 /* Clean things up */
1118 while (paths) {
1119 struct combine_diff_path *tmp = paths;
1120 paths = paths->next;
1121 free(tmp);
1122 }
1123 }
1124
1125 void diff_tree_combined_merge(const unsigned char *sha1,
1126 int dense, struct rev_info *rev)
1127 {
1128 int num_parent;
1129 const unsigned char (*parent)[20];
1130 struct commit *commit = lookup_commit(sha1);
1131 struct commit_list *parents;
1132
1133 /* count parents */
1134 for (parents = commit->parents, num_parent = 0;
1135 parents;
1136 parents = parents->next, num_parent++)
1137 ; /* nothing */
1138
1139 parent = xmalloc(num_parent * sizeof(*parent));
1140 for (parents = commit->parents, num_parent = 0;
1141 parents;
1142 parents = parents->next, num_parent++)
1143 hashcpy((unsigned char *)(parent + num_parent),
1144 parents->item->object.sha1);
1145 diff_tree_combined(sha1, parent, num_parent, dense, rev);
1146 }
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