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Fix "git help -a" terminal autosizing
[git/jnareb-git.git] / diff.c
blob13b216f2733763b4e6cc6a3c37ff2624d7f55266
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #include <sys/types.h>
5 #include <sys/wait.h>
6 #include <signal.h>
7 #include "cache.h"
8 #include "quote.h"
9 #include "diff.h"
10 #include "diffcore.h"
11 #include "xdiff-interface.h"
12
13 static int use_size_cache;
14
15 int diff_rename_limit_default = -1;
16
17 int git_diff_config(const char *var, const char *value)
18 {
19 if (!strcmp(var, "diff.renamelimit")) {
20 diff_rename_limit_default = git_config_int(var, value);
21 return 0;
22 }
23
24 return git_default_config(var, value);
25 }
26
27 static char *quote_one(const char *str)
28 {
29 int needlen;
30 char *xp;
31
32 if (!str)
33 return NULL;
34 needlen = quote_c_style(str, NULL, NULL, 0);
35 if (!needlen)
36 return strdup(str);
37 xp = xmalloc(needlen + 1);
38 quote_c_style(str, xp, NULL, 0);
39 return xp;
40 }
41
42 static char *quote_two(const char *one, const char *two)
43 {
44 int need_one = quote_c_style(one, NULL, NULL, 1);
45 int need_two = quote_c_style(two, NULL, NULL, 1);
46 char *xp;
47
48 if (need_one + need_two) {
49 if (!need_one) need_one = strlen(one);
50 if (!need_two) need_one = strlen(two);
51
52 xp = xmalloc(need_one + need_two + 3);
53 xp[0] = '"';
54 quote_c_style(one, xp + 1, NULL, 1);
55 quote_c_style(two, xp + need_one + 1, NULL, 1);
56 strcpy(xp + need_one + need_two + 1, "\"");
57 return xp;
58 }
59 need_one = strlen(one);
60 need_two = strlen(two);
61 xp = xmalloc(need_one + need_two + 1);
62 strcpy(xp, one);
63 strcpy(xp + need_one, two);
64 return xp;
65 }
66
67 static const char *external_diff(void)
68 {
69 static const char *external_diff_cmd = NULL;
70 static int done_preparing = 0;
71
72 if (done_preparing)
73 return external_diff_cmd;
74 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
75 done_preparing = 1;
76 return external_diff_cmd;
77 }
78
79 #define TEMPFILE_PATH_LEN 50
80
81 static struct diff_tempfile {
82 const char *name; /* filename external diff should read from */
83 char hex[41];
84 char mode[10];
85 char tmp_path[TEMPFILE_PATH_LEN];
86 } diff_temp[2];
87
88 static int count_lines(const char *data, int size)
89 {
90 int count, ch, completely_empty = 1, nl_just_seen = 0;
91 count = 0;
92 while (0 < size--) {
93 ch = *data++;
94 if (ch == '\n') {
95 count++;
96 nl_just_seen = 1;
97 completely_empty = 0;
98 }
99 else {
100 nl_just_seen = 0;
101 completely_empty = 0;
102 }
103 }
104 if (completely_empty)
105 return 0;
106 if (!nl_just_seen)
107 count++; /* no trailing newline */
108 return count;
109 }
110
111 static void print_line_count(int count)
112 {
113 switch (count) {
114 case 0:
115 printf("0,0");
116 break;
117 case 1:
118 printf("1");
119 break;
120 default:
121 printf("1,%d", count);
122 break;
123 }
124 }
125
126 static void copy_file(int prefix, const char *data, int size)
127 {
128 int ch, nl_just_seen = 1;
129 while (0 < size--) {
130 ch = *data++;
131 if (nl_just_seen)
132 putchar(prefix);
133 putchar(ch);
134 if (ch == '\n')
135 nl_just_seen = 1;
136 else
137 nl_just_seen = 0;
138 }
139 if (!nl_just_seen)
140 printf("\n\\ No newline at end of file\n");
141 }
142
143 static void emit_rewrite_diff(const char *name_a,
144 const char *name_b,
145 struct diff_filespec *one,
146 struct diff_filespec *two)
147 {
148 int lc_a, lc_b;
149 diff_populate_filespec(one, 0);
150 diff_populate_filespec(two, 0);
151 lc_a = count_lines(one->data, one->size);
152 lc_b = count_lines(two->data, two->size);
153 printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
154 print_line_count(lc_a);
155 printf(" +");
156 print_line_count(lc_b);
157 printf(" @@\n");
158 if (lc_a)
159 copy_file('-', one->data, one->size);
160 if (lc_b)
161 copy_file('+', two->data, two->size);
162 }
163
164 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
165 {
166 if (!DIFF_FILE_VALID(one)) {
167 mf->ptr = ""; /* does not matter */
168 mf->size = 0;
169 return 0;
170 }
171 else if (diff_populate_filespec(one, 0))
172 return -1;
173 mf->ptr = one->data;
174 mf->size = one->size;
175 return 0;
176 }
177
178 struct emit_callback {
179 const char **label_path;
180 };
181
182 static int fn_out(void *priv, mmbuffer_t *mb, int nbuf)
183 {
184 int i;
185 struct emit_callback *ecbdata = priv;
186
187 if (ecbdata->label_path[0]) {
188 printf("--- %s\n", ecbdata->label_path[0]);
189 printf("+++ %s\n", ecbdata->label_path[1]);
190 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
191 }
192 for (i = 0; i < nbuf; i++)
193 if (!fwrite(mb[i].ptr, mb[i].size, 1, stdout))
194 return -1;
195 return 0;
196 }
197
198 static char *pprint_rename(const char *a, const char *b)
199 {
200 const char *old = a;
201 const char *new = b;
202 char *name = NULL;
203 int pfx_length, sfx_length;
204 int len_a = strlen(a);
205 int len_b = strlen(b);
206
207 /* Find common prefix */
208 pfx_length = 0;
209 while (*old && *new && *old == *new) {
210 if (*old == '/')
211 pfx_length = old - a + 1;
212 old++;
213 new++;
214 }
215
216 /* Find common suffix */
217 old = a + len_a;
218 new = b + len_b;
219 sfx_length = 0;
220 while (a <= old && b <= new && *old == *new) {
221 if (*old == '/')
222 sfx_length = len_a - (old - a);
223 old--;
224 new--;
225 }
226
227 /*
228 * pfx{mid-a => mid-b}sfx
229 * {pfx-a => pfx-b}sfx
230 * pfx{sfx-a => sfx-b}
231 * name-a => name-b
232 */
233 if (pfx_length + sfx_length) {
234 name = xmalloc(len_a + len_b - pfx_length - sfx_length + 7);
235 sprintf(name, "%.*s{%.*s => %.*s}%s",
236 pfx_length, a,
237 len_a - pfx_length - sfx_length, a + pfx_length,
238 len_b - pfx_length - sfx_length, b + pfx_length,
239 a + len_a - sfx_length);
240 }
241 else {
242 name = xmalloc(len_a + len_b + 5);
243 sprintf(name, "%s => %s", a, b);
244 }
245 return name;
246 }
247
248 struct diffstat_t {
249 struct xdiff_emit_state xm;
250
251 int nr;
252 int alloc;
253 struct diffstat_file {
254 char *name;
255 unsigned is_unmerged:1;
256 unsigned is_binary:1;
257 unsigned is_renamed:1;
258 unsigned int added, deleted;
259 } **files;
260 };
261
262 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
263 const char *name_a,
264 const char *name_b)
265 {
266 struct diffstat_file *x;
267 x = xcalloc(sizeof (*x), 1);
268 if (diffstat->nr == diffstat->alloc) {
269 diffstat->alloc = alloc_nr(diffstat->alloc);
270 diffstat->files = xrealloc(diffstat->files,
271 diffstat->alloc * sizeof(x));
272 }
273 diffstat->files[diffstat->nr++] = x;
274 if (name_b) {
275 x->name = pprint_rename(name_a, name_b);
276 x->is_renamed = 1;
277 }
278 else
279 x->name = strdup(name_a);
280 return x;
281 }
282
283 static void diffstat_consume(void *priv, char *line, unsigned long len)
284 {
285 struct diffstat_t *diffstat = priv;
286 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
287
288 if (line[0] == '+')
289 x->added++;
290 else if (line[0] == '-')
291 x->deleted++;
292 }
293
294 static const char pluses[] = "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
295 static const char minuses[]= "----------------------------------------------------------------------";
296
297 static void show_stats(struct diffstat_t* data)
298 {
299 char *prefix = "";
300 int i, len, add, del, total, adds = 0, dels = 0;
301 int max, max_change = 0, max_len = 0;
302 int total_files = data->nr;
303
304 if (data->nr == 0)
305 return;
306
307 for (i = 0; i < data->nr; i++) {
308 struct diffstat_file *file = data->files[i];
309
310 len = strlen(file->name);
311 if (max_len < len)
312 max_len = len;
313
314 if (file->is_binary || file->is_unmerged)
315 continue;
316 if (max_change < file->added + file->deleted)
317 max_change = file->added + file->deleted;
318 }
319
320 for (i = 0; i < data->nr; i++) {
321 char *name = data->files[i]->name;
322 int added = data->files[i]->added;
323 int deleted = data->files[i]->deleted;
324
325 if (0 < (len = quote_c_style(name, NULL, NULL, 0))) {
326 char *qname = xmalloc(len + 1);
327 quote_c_style(name, qname, NULL, 0);
328 free(name);
329 data->files[i]->name = name = qname;
330 }
331
332 /*
333 * "scale" the filename
334 */
335 len = strlen(name);
336 max = max_len;
337 if (max > 50)
338 max = 50;
339 if (len > max) {
340 char *slash;
341 prefix = "...";
342 max -= 3;
343 name += len - max;
344 slash = strchr(name, '/');
345 if (slash)
346 name = slash;
347 }
348 len = max;
349
350 /*
351 * scale the add/delete
352 */
353 max = max_change;
354 if (max + len > 70)
355 max = 70 - len;
356
357 if (data->files[i]->is_binary) {
358 printf(" %s%-*s | Bin\n", prefix, len, name);
359 goto free_diffstat_file;
360 }
361 else if (data->files[i]->is_unmerged) {
362 printf(" %s%-*s | Unmerged\n", prefix, len, name);
363 goto free_diffstat_file;
364 }
365 else if (!data->files[i]->is_renamed &&
366 (added + deleted == 0)) {
367 total_files--;
368 goto free_diffstat_file;
369 }
370
371 add = added;
372 del = deleted;
373 total = add + del;
374 adds += add;
375 dels += del;
376
377 if (max_change > 0) {
378 total = (total * max + max_change / 2) / max_change;
379 add = (add * max + max_change / 2) / max_change;
380 del = total - add;
381 }
382 printf(" %s%-*s |%5d %.*s%.*s\n", prefix,
383 len, name, added + deleted,
384 add, pluses, del, minuses);
385 free_diffstat_file:
386 free(data->files[i]->name);
387 free(data->files[i]);
388 }
389 free(data->files);
390 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
391 total_files, adds, dels);
392 }
393
394 #define FIRST_FEW_BYTES 8000
395 static int mmfile_is_binary(mmfile_t *mf)
396 {
397 long sz = mf->size;
398 if (FIRST_FEW_BYTES < sz)
399 sz = FIRST_FEW_BYTES;
400 if (memchr(mf->ptr, 0, sz))
401 return 1;
402 return 0;
403 }
404
405 static void builtin_diff(const char *name_a,
406 const char *name_b,
407 struct diff_filespec *one,
408 struct diff_filespec *two,
409 const char *xfrm_msg,
410 int complete_rewrite)
411 {
412 mmfile_t mf1, mf2;
413 const char *lbl[2];
414 char *a_one, *b_two;
415
416 a_one = quote_two("a/", name_a);
417 b_two = quote_two("b/", name_b);
418 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
419 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
420 printf("diff --git %s %s\n", a_one, b_two);
421 if (lbl[0][0] == '/') {
422 /* /dev/null */
423 printf("new file mode %06o\n", two->mode);
424 if (xfrm_msg && xfrm_msg[0])
425 puts(xfrm_msg);
426 }
427 else if (lbl[1][0] == '/') {
428 printf("deleted file mode %06o\n", one->mode);
429 if (xfrm_msg && xfrm_msg[0])
430 puts(xfrm_msg);
431 }
432 else {
433 if (one->mode != two->mode) {
434 printf("old mode %06o\n", one->mode);
435 printf("new mode %06o\n", two->mode);
436 }
437 if (xfrm_msg && xfrm_msg[0])
438 puts(xfrm_msg);
439 /*
440 * we do not run diff between different kind
441 * of objects.
442 */
443 if ((one->mode ^ two->mode) & S_IFMT)
444 goto free_ab_and_return;
445 if (complete_rewrite) {
446 emit_rewrite_diff(name_a, name_b, one, two);
447 goto free_ab_and_return;
448 }
449 }
450
451 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
452 die("unable to read files to diff");
453
454 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
455 printf("Binary files %s and %s differ\n", lbl[0], lbl[1]);
456 else {
457 /* Crazy xdl interfaces.. */
458 const char *diffopts = getenv("GIT_DIFF_OPTS");
459 xpparam_t xpp;
460 xdemitconf_t xecfg;
461 xdemitcb_t ecb;
462 struct emit_callback ecbdata;
463
464 ecbdata.label_path = lbl;
465 xpp.flags = XDF_NEED_MINIMAL;
466 xecfg.ctxlen = 3;
467 xecfg.flags = XDL_EMIT_FUNCNAMES;
468 if (!diffopts)
469 ;
470 else if (!strncmp(diffopts, "--unified=", 10))
471 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
472 else if (!strncmp(diffopts, "-u", 2))
473 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
474 ecb.outf = fn_out;
475 ecb.priv = &ecbdata;
476 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
477 }
478
479 free_ab_and_return:
480 free(a_one);
481 free(b_two);
482 return;
483 }
484
485 static void builtin_diffstat(const char *name_a, const char *name_b,
486 struct diff_filespec *one,
487 struct diff_filespec *two,
488 struct diffstat_t *diffstat)
489 {
490 mmfile_t mf1, mf2;
491 struct diffstat_file *data;
492
493 data = diffstat_add(diffstat, name_a, name_b);
494
495 if (!one || !two) {
496 data->is_unmerged = 1;
497 return;
498 }
499
500 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
501 die("unable to read files to diff");
502
503 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
504 data->is_binary = 1;
505 else {
506 /* Crazy xdl interfaces.. */
507 xpparam_t xpp;
508 xdemitconf_t xecfg;
509 xdemitcb_t ecb;
510
511 xpp.flags = XDF_NEED_MINIMAL;
512 xecfg.ctxlen = 0;
513 xecfg.flags = 0;
514 ecb.outf = xdiff_outf;
515 ecb.priv = diffstat;
516 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
517 }
518 }
519
520 struct diff_filespec *alloc_filespec(const char *path)
521 {
522 int namelen = strlen(path);
523 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
524
525 memset(spec, 0, sizeof(*spec));
526 spec->path = (char *)(spec + 1);
527 memcpy(spec->path, path, namelen+1);
528 return spec;
529 }
530
531 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
532 unsigned short mode)
533 {
534 if (mode) {
535 spec->mode = canon_mode(mode);
536 memcpy(spec->sha1, sha1, 20);
537 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
538 }
539 }
540
541 /*
542 * Given a name and sha1 pair, if the dircache tells us the file in
543 * the work tree has that object contents, return true, so that
544 * prepare_temp_file() does not have to inflate and extract.
545 */
546 static int work_tree_matches(const char *name, const unsigned char *sha1)
547 {
548 struct cache_entry *ce;
549 struct stat st;
550 int pos, len;
551
552 /* We do not read the cache ourselves here, because the
553 * benchmark with my previous version that always reads cache
554 * shows that it makes things worse for diff-tree comparing
555 * two linux-2.6 kernel trees in an already checked out work
556 * tree. This is because most diff-tree comparisons deal with
557 * only a small number of files, while reading the cache is
558 * expensive for a large project, and its cost outweighs the
559 * savings we get by not inflating the object to a temporary
560 * file. Practically, this code only helps when we are used
561 * by diff-cache --cached, which does read the cache before
562 * calling us.
563 */
564 if (!active_cache)
565 return 0;
566
567 len = strlen(name);
568 pos = cache_name_pos(name, len);
569 if (pos < 0)
570 return 0;
571 ce = active_cache[pos];
572 if ((lstat(name, &st) < 0) ||
573 !S_ISREG(st.st_mode) || /* careful! */
574 ce_match_stat(ce, &st, 0) ||
575 memcmp(sha1, ce->sha1, 20))
576 return 0;
577 /* we return 1 only when we can stat, it is a regular file,
578 * stat information matches, and sha1 recorded in the cache
579 * matches. I.e. we know the file in the work tree really is
580 * the same as the <name, sha1> pair.
581 */
582 return 1;
583 }
584
585 static struct sha1_size_cache {
586 unsigned char sha1[20];
587 unsigned long size;
588 } **sha1_size_cache;
589 static int sha1_size_cache_nr, sha1_size_cache_alloc;
590
591 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
592 int find_only,
593 unsigned long size)
594 {
595 int first, last;
596 struct sha1_size_cache *e;
597
598 first = 0;
599 last = sha1_size_cache_nr;
600 while (last > first) {
601 int cmp, next = (last + first) >> 1;
602 e = sha1_size_cache[next];
603 cmp = memcmp(e->sha1, sha1, 20);
604 if (!cmp)
605 return e;
606 if (cmp < 0) {
607 last = next;
608 continue;
609 }
610 first = next+1;
611 }
612 /* not found */
613 if (find_only)
614 return NULL;
615 /* insert to make it at "first" */
616 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
617 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
618 sha1_size_cache = xrealloc(sha1_size_cache,
619 sha1_size_cache_alloc *
620 sizeof(*sha1_size_cache));
621 }
622 sha1_size_cache_nr++;
623 if (first < sha1_size_cache_nr)
624 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
625 (sha1_size_cache_nr - first - 1) *
626 sizeof(*sha1_size_cache));
627 e = xmalloc(sizeof(struct sha1_size_cache));
628 sha1_size_cache[first] = e;
629 memcpy(e->sha1, sha1, 20);
630 e->size = size;
631 return e;
632 }
633
634 /*
635 * While doing rename detection and pickaxe operation, we may need to
636 * grab the data for the blob (or file) for our own in-core comparison.
637 * diff_filespec has data and size fields for this purpose.
638 */
639 int diff_populate_filespec(struct diff_filespec *s, int size_only)
640 {
641 int err = 0;
642 if (!DIFF_FILE_VALID(s))
643 die("internal error: asking to populate invalid file.");
644 if (S_ISDIR(s->mode))
645 return -1;
646
647 if (!use_size_cache)
648 size_only = 0;
649
650 if (s->data)
651 return err;
652 if (!s->sha1_valid ||
653 work_tree_matches(s->path, s->sha1)) {
654 struct stat st;
655 int fd;
656 if (lstat(s->path, &st) < 0) {
657 if (errno == ENOENT) {
658 err_empty:
659 err = -1;
660 empty:
661 s->data = "";
662 s->size = 0;
663 return err;
664 }
665 }
666 s->size = st.st_size;
667 if (!s->size)
668 goto empty;
669 if (size_only)
670 return 0;
671 if (S_ISLNK(st.st_mode)) {
672 int ret;
673 s->data = xmalloc(s->size);
674 s->should_free = 1;
675 ret = readlink(s->path, s->data, s->size);
676 if (ret < 0) {
677 free(s->data);
678 goto err_empty;
679 }
680 return 0;
681 }
682 fd = open(s->path, O_RDONLY);
683 if (fd < 0)
684 goto err_empty;
685 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
686 close(fd);
687 if (s->data == MAP_FAILED)
688 goto err_empty;
689 s->should_munmap = 1;
690 }
691 else {
692 char type[20];
693 struct sha1_size_cache *e;
694
695 if (size_only) {
696 e = locate_size_cache(s->sha1, 1, 0);
697 if (e) {
698 s->size = e->size;
699 return 0;
700 }
701 if (!sha1_object_info(s->sha1, type, &s->size))
702 locate_size_cache(s->sha1, 0, s->size);
703 }
704 else {
705 s->data = read_sha1_file(s->sha1, type, &s->size);
706 s->should_free = 1;
707 }
708 }
709 return 0;
710 }
711
712 void diff_free_filespec_data(struct diff_filespec *s)
713 {
714 if (s->should_free)
715 free(s->data);
716 else if (s->should_munmap)
717 munmap(s->data, s->size);
718 s->should_free = s->should_munmap = 0;
719 s->data = NULL;
720 free(s->cnt_data);
721 s->cnt_data = NULL;
722 }
723
724 static void prep_temp_blob(struct diff_tempfile *temp,
725 void *blob,
726 unsigned long size,
727 const unsigned char *sha1,
728 int mode)
729 {
730 int fd;
731
732 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
733 if (fd < 0)
734 die("unable to create temp-file");
735 if (write(fd, blob, size) != size)
736 die("unable to write temp-file");
737 close(fd);
738 temp->name = temp->tmp_path;
739 strcpy(temp->hex, sha1_to_hex(sha1));
740 temp->hex[40] = 0;
741 sprintf(temp->mode, "%06o", mode);
742 }
743
744 static void prepare_temp_file(const char *name,
745 struct diff_tempfile *temp,
746 struct diff_filespec *one)
747 {
748 if (!DIFF_FILE_VALID(one)) {
749 not_a_valid_file:
750 /* A '-' entry produces this for file-2, and
751 * a '+' entry produces this for file-1.
752 */
753 temp->name = "/dev/null";
754 strcpy(temp->hex, ".");
755 strcpy(temp->mode, ".");
756 return;
757 }
758
759 if (!one->sha1_valid ||
760 work_tree_matches(name, one->sha1)) {
761 struct stat st;
762 if (lstat(name, &st) < 0) {
763 if (errno == ENOENT)
764 goto not_a_valid_file;
765 die("stat(%s): %s", name, strerror(errno));
766 }
767 if (S_ISLNK(st.st_mode)) {
768 int ret;
769 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
770 if (sizeof(buf) <= st.st_size)
771 die("symlink too long: %s", name);
772 ret = readlink(name, buf, st.st_size);
773 if (ret < 0)
774 die("readlink(%s)", name);
775 prep_temp_blob(temp, buf, st.st_size,
776 (one->sha1_valid ?
777 one->sha1 : null_sha1),
778 (one->sha1_valid ?
779 one->mode : S_IFLNK));
780 }
781 else {
782 /* we can borrow from the file in the work tree */
783 temp->name = name;
784 if (!one->sha1_valid)
785 strcpy(temp->hex, sha1_to_hex(null_sha1));
786 else
787 strcpy(temp->hex, sha1_to_hex(one->sha1));
788 /* Even though we may sometimes borrow the
789 * contents from the work tree, we always want
790 * one->mode. mode is trustworthy even when
791 * !(one->sha1_valid), as long as
792 * DIFF_FILE_VALID(one).
793 */
794 sprintf(temp->mode, "%06o", one->mode);
795 }
796 return;
797 }
798 else {
799 if (diff_populate_filespec(one, 0))
800 die("cannot read data blob for %s", one->path);
801 prep_temp_blob(temp, one->data, one->size,
802 one->sha1, one->mode);
803 }
804 }
805
806 static void remove_tempfile(void)
807 {
808 int i;
809
810 for (i = 0; i < 2; i++)
811 if (diff_temp[i].name == diff_temp[i].tmp_path) {
812 unlink(diff_temp[i].name);
813 diff_temp[i].name = NULL;
814 }
815 }
816
817 static void remove_tempfile_on_signal(int signo)
818 {
819 remove_tempfile();
820 signal(SIGINT, SIG_DFL);
821 raise(signo);
822 }
823
824 static int spawn_prog(const char *pgm, const char **arg)
825 {
826 pid_t pid;
827 int status;
828
829 fflush(NULL);
830 pid = fork();
831 if (pid < 0)
832 die("unable to fork");
833 if (!pid) {
834 execvp(pgm, (char *const*) arg);
835 exit(255);
836 }
837
838 while (waitpid(pid, &status, 0) < 0) {
839 if (errno == EINTR)
840 continue;
841 return -1;
842 }
843
844 /* Earlier we did not check the exit status because
845 * diff exits non-zero if files are different, and
846 * we are not interested in knowing that. It was a
847 * mistake which made it harder to quit a diff-*
848 * session that uses the git-apply-patch-script as
849 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
850 * should also exit non-zero only when it wants to
851 * abort the entire diff-* session.
852 */
853 if (WIFEXITED(status) && !WEXITSTATUS(status))
854 return 0;
855 return -1;
856 }
857
858 /* An external diff command takes:
859 *
860 * diff-cmd name infile1 infile1-sha1 infile1-mode \
861 * infile2 infile2-sha1 infile2-mode [ rename-to ]
862 *
863 */
864 static void run_external_diff(const char *pgm,
865 const char *name,
866 const char *other,
867 struct diff_filespec *one,
868 struct diff_filespec *two,
869 const char *xfrm_msg,
870 int complete_rewrite)
871 {
872 const char *spawn_arg[10];
873 struct diff_tempfile *temp = diff_temp;
874 int retval;
875 static int atexit_asked = 0;
876 const char *othername;
877 const char **arg = &spawn_arg[0];
878
879 othername = (other? other : name);
880 if (one && two) {
881 prepare_temp_file(name, &temp[0], one);
882 prepare_temp_file(othername, &temp[1], two);
883 if (! atexit_asked &&
884 (temp[0].name == temp[0].tmp_path ||
885 temp[1].name == temp[1].tmp_path)) {
886 atexit_asked = 1;
887 atexit(remove_tempfile);
888 }
889 signal(SIGINT, remove_tempfile_on_signal);
890 }
891
892 if (one && two) {
893 *arg++ = pgm;
894 *arg++ = name;
895 *arg++ = temp[0].name;
896 *arg++ = temp[0].hex;
897 *arg++ = temp[0].mode;
898 *arg++ = temp[1].name;
899 *arg++ = temp[1].hex;
900 *arg++ = temp[1].mode;
901 if (other) {
902 *arg++ = other;
903 *arg++ = xfrm_msg;
904 }
905 } else {
906 *arg++ = pgm;
907 *arg++ = name;
908 }
909 *arg = NULL;
910 retval = spawn_prog(pgm, spawn_arg);
911 remove_tempfile();
912 if (retval) {
913 fprintf(stderr, "external diff died, stopping at %s.\n", name);
914 exit(1);
915 }
916 }
917
918 static void run_diff_cmd(const char *pgm,
919 const char *name,
920 const char *other,
921 struct diff_filespec *one,
922 struct diff_filespec *two,
923 const char *xfrm_msg,
924 int complete_rewrite)
925 {
926 if (pgm) {
927 run_external_diff(pgm, name, other, one, two, xfrm_msg,
928 complete_rewrite);
929 return;
930 }
931 if (one && two)
932 builtin_diff(name, other ? other : name,
933 one, two, xfrm_msg, complete_rewrite);
934 else
935 printf("* Unmerged path %s\n", name);
936 }
937
938 static void diff_fill_sha1_info(struct diff_filespec *one)
939 {
940 if (DIFF_FILE_VALID(one)) {
941 if (!one->sha1_valid) {
942 struct stat st;
943 if (lstat(one->path, &st) < 0)
944 die("stat %s", one->path);
945 if (index_path(one->sha1, one->path, &st, 0))
946 die("cannot hash %s\n", one->path);
947 }
948 }
949 else
950 memset(one->sha1, 0, 20);
951 }
952
953 static void run_diff(struct diff_filepair *p, struct diff_options *o)
954 {
955 const char *pgm = external_diff();
956 char msg[PATH_MAX*2+300], *xfrm_msg;
957 struct diff_filespec *one;
958 struct diff_filespec *two;
959 const char *name;
960 const char *other;
961 char *name_munged, *other_munged;
962 int complete_rewrite = 0;
963 int len;
964
965 if (DIFF_PAIR_UNMERGED(p)) {
966 /* unmerged */
967 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, 0);
968 return;
969 }
970
971 name = p->one->path;
972 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
973 name_munged = quote_one(name);
974 other_munged = quote_one(other);
975 one = p->one; two = p->two;
976
977 diff_fill_sha1_info(one);
978 diff_fill_sha1_info(two);
979
980 len = 0;
981 switch (p->status) {
982 case DIFF_STATUS_COPIED:
983 len += snprintf(msg + len, sizeof(msg) - len,
984 "similarity index %d%%\n"
985 "copy from %s\n"
986 "copy to %s\n",
987 (int)(0.5 + p->score * 100.0/MAX_SCORE),
988 name_munged, other_munged);
989 break;
990 case DIFF_STATUS_RENAMED:
991 len += snprintf(msg + len, sizeof(msg) - len,
992 "similarity index %d%%\n"
993 "rename from %s\n"
994 "rename to %s\n",
995 (int)(0.5 + p->score * 100.0/MAX_SCORE),
996 name_munged, other_munged);
997 break;
998 case DIFF_STATUS_MODIFIED:
999 if (p->score) {
1000 len += snprintf(msg + len, sizeof(msg) - len,
1001 "dissimilarity index %d%%\n",
1002 (int)(0.5 + p->score *
1003 100.0/MAX_SCORE));
1004 complete_rewrite = 1;
1005 break;
1006 }
1007 /* fallthru */
1008 default:
1009 /* nothing */
1010 ;
1011 }
1012
1013 if (memcmp(one->sha1, two->sha1, 20)) {
1014 char one_sha1[41];
1015 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
1016 memcpy(one_sha1, sha1_to_hex(one->sha1), 41);
1017
1018 len += snprintf(msg + len, sizeof(msg) - len,
1019 "index %.*s..%.*s",
1020 abbrev, one_sha1, abbrev,
1021 sha1_to_hex(two->sha1));
1022 if (one->mode == two->mode)
1023 len += snprintf(msg + len, sizeof(msg) - len,
1024 " %06o", one->mode);
1025 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1026 }
1027
1028 if (len)
1029 msg[--len] = 0;
1030 xfrm_msg = len ? msg : NULL;
1031
1032 if (!pgm &&
1033 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1034 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1035 /* a filepair that changes between file and symlink
1036 * needs to be split into deletion and creation.
1037 */
1038 struct diff_filespec *null = alloc_filespec(two->path);
1039 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, 0);
1040 free(null);
1041 null = alloc_filespec(one->path);
1042 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, 0);
1043 free(null);
1044 }
1045 else
1046 run_diff_cmd(pgm, name, other, one, two, xfrm_msg,
1047 complete_rewrite);
1048
1049 free(name_munged);
1050 free(other_munged);
1051 }
1052
1053 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1054 struct diffstat_t *diffstat)
1055 {
1056 const char *name;
1057 const char *other;
1058
1059 if (DIFF_PAIR_UNMERGED(p)) {
1060 /* unmerged */
1061 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat);
1062 return;
1063 }
1064
1065 name = p->one->path;
1066 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1067
1068 diff_fill_sha1_info(p->one);
1069 diff_fill_sha1_info(p->two);
1070
1071 builtin_diffstat(name, other, p->one, p->two, diffstat);
1072 }
1073
1074 void diff_setup(struct diff_options *options)
1075 {
1076 memset(options, 0, sizeof(*options));
1077 options->output_format = DIFF_FORMAT_RAW;
1078 options->line_termination = '\n';
1079 options->break_opt = -1;
1080 options->rename_limit = -1;
1081
1082 options->change = diff_change;
1083 options->add_remove = diff_addremove;
1084 }
1085
1086 int diff_setup_done(struct diff_options *options)
1087 {
1088 if ((options->find_copies_harder &&
1089 options->detect_rename != DIFF_DETECT_COPY) ||
1090 (0 <= options->rename_limit && !options->detect_rename))
1091 return -1;
1092
1093 /*
1094 * These cases always need recursive; we do not drop caller-supplied
1095 * recursive bits for other formats here.
1096 */
1097 if ((options->output_format == DIFF_FORMAT_PATCH) ||
1098 (options->output_format == DIFF_FORMAT_DIFFSTAT))
1099 options->recursive = 1;
1100
1101 if (options->detect_rename && options->rename_limit < 0)
1102 options->rename_limit = diff_rename_limit_default;
1103 if (options->setup & DIFF_SETUP_USE_CACHE) {
1104 if (!active_cache)
1105 /* read-cache does not die even when it fails
1106 * so it is safe for us to do this here. Also
1107 * it does not smudge active_cache or active_nr
1108 * when it fails, so we do not have to worry about
1109 * cleaning it up ourselves either.
1110 */
1111 read_cache();
1112 }
1113 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1114 use_size_cache = 1;
1115 if (options->abbrev <= 0 || 40 < options->abbrev)
1116 options->abbrev = 40; /* full */
1117
1118 return 0;
1119 }
1120
1121 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
1122 {
1123 const char *arg = av[0];
1124 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
1125 options->output_format = DIFF_FORMAT_PATCH;
1126 else if (!strcmp(arg, "--patch-with-raw")) {
1127 options->output_format = DIFF_FORMAT_PATCH;
1128 options->with_raw = 1;
1129 }
1130 else if (!strcmp(arg, "--stat"))
1131 options->output_format = DIFF_FORMAT_DIFFSTAT;
1132 else if (!strcmp(arg, "--patch-with-stat")) {
1133 options->output_format = DIFF_FORMAT_PATCH;
1134 options->with_stat = 1;
1135 }
1136 else if (!strcmp(arg, "-z"))
1137 options->line_termination = 0;
1138 else if (!strncmp(arg, "-l", 2))
1139 options->rename_limit = strtoul(arg+2, NULL, 10);
1140 else if (!strcmp(arg, "--full-index"))
1141 options->full_index = 1;
1142 else if (!strcmp(arg, "--name-only"))
1143 options->output_format = DIFF_FORMAT_NAME;
1144 else if (!strcmp(arg, "--name-status"))
1145 options->output_format = DIFF_FORMAT_NAME_STATUS;
1146 else if (!strcmp(arg, "-R"))
1147 options->reverse_diff = 1;
1148 else if (!strncmp(arg, "-S", 2))
1149 options->pickaxe = arg + 2;
1150 else if (!strcmp(arg, "-s"))
1151 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1152 else if (!strncmp(arg, "-O", 2))
1153 options->orderfile = arg + 2;
1154 else if (!strncmp(arg, "--diff-filter=", 14))
1155 options->filter = arg + 14;
1156 else if (!strcmp(arg, "--pickaxe-all"))
1157 options->pickaxe_opts = DIFF_PICKAXE_ALL;
1158 else if (!strcmp(arg, "--pickaxe-regex"))
1159 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
1160 else if (!strncmp(arg, "-B", 2)) {
1161 if ((options->break_opt =
1162 diff_scoreopt_parse(arg)) == -1)
1163 return -1;
1164 }
1165 else if (!strncmp(arg, "-M", 2)) {
1166 if ((options->rename_score =
1167 diff_scoreopt_parse(arg)) == -1)
1168 return -1;
1169 options->detect_rename = DIFF_DETECT_RENAME;
1170 }
1171 else if (!strncmp(arg, "-C", 2)) {
1172 if ((options->rename_score =
1173 diff_scoreopt_parse(arg)) == -1)
1174 return -1;
1175 options->detect_rename = DIFF_DETECT_COPY;
1176 }
1177 else if (!strcmp(arg, "--find-copies-harder"))
1178 options->find_copies_harder = 1;
1179 else if (!strcmp(arg, "--abbrev"))
1180 options->abbrev = DEFAULT_ABBREV;
1181 else if (!strncmp(arg, "--abbrev=", 9)) {
1182 options->abbrev = strtoul(arg + 9, NULL, 10);
1183 if (options->abbrev < MINIMUM_ABBREV)
1184 options->abbrev = MINIMUM_ABBREV;
1185 else if (40 < options->abbrev)
1186 options->abbrev = 40;
1187 }
1188 else
1189 return 0;
1190 return 1;
1191 }
1192
1193 static int parse_num(const char **cp_p)
1194 {
1195 unsigned long num, scale;
1196 int ch, dot;
1197 const char *cp = *cp_p;
1198
1199 num = 0;
1200 scale = 1;
1201 dot = 0;
1202 for(;;) {
1203 ch = *cp;
1204 if ( !dot && ch == '.' ) {
1205 scale = 1;
1206 dot = 1;
1207 } else if ( ch == '%' ) {
1208 scale = dot ? scale*100 : 100;
1209 cp++; /* % is always at the end */
1210 break;
1211 } else if ( ch >= '0' && ch <= '9' ) {
1212 if ( scale < 100000 ) {
1213 scale *= 10;
1214 num = (num*10) + (ch-'0');
1215 }
1216 } else {
1217 break;
1218 }
1219 cp++;
1220 }
1221 *cp_p = cp;
1222
1223 /* user says num divided by scale and we say internally that
1224 * is MAX_SCORE * num / scale.
1225 */
1226 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
1227 }
1228
1229 int diff_scoreopt_parse(const char *opt)
1230 {
1231 int opt1, opt2, cmd;
1232
1233 if (*opt++ != '-')
1234 return -1;
1235 cmd = *opt++;
1236 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
1237 return -1; /* that is not a -M, -C nor -B option */
1238
1239 opt1 = parse_num(&opt);
1240 if (cmd != 'B')
1241 opt2 = 0;
1242 else {
1243 if (*opt == 0)
1244 opt2 = 0;
1245 else if (*opt != '/')
1246 return -1; /* we expect -B80/99 or -B80 */
1247 else {
1248 opt++;
1249 opt2 = parse_num(&opt);
1250 }
1251 }
1252 if (*opt != 0)
1253 return -1;
1254 return opt1 | (opt2 << 16);
1255 }
1256
1257 struct diff_queue_struct diff_queued_diff;
1258
1259 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
1260 {
1261 if (queue->alloc <= queue->nr) {
1262 queue->alloc = alloc_nr(queue->alloc);
1263 queue->queue = xrealloc(queue->queue,
1264 sizeof(dp) * queue->alloc);
1265 }
1266 queue->queue[queue->nr++] = dp;
1267 }
1268
1269 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1270 struct diff_filespec *one,
1271 struct diff_filespec *two)
1272 {
1273 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1274 dp->one = one;
1275 dp->two = two;
1276 dp->score = 0;
1277 dp->status = 0;
1278 dp->source_stays = 0;
1279 dp->broken_pair = 0;
1280 if (queue)
1281 diff_q(queue, dp);
1282 return dp;
1283 }
1284
1285 void diff_free_filepair(struct diff_filepair *p)
1286 {
1287 diff_free_filespec_data(p->one);
1288 diff_free_filespec_data(p->two);
1289 free(p->one);
1290 free(p->two);
1291 free(p);
1292 }
1293
1294 /* This is different from find_unique_abbrev() in that
1295 * it stuffs the result with dots for alignment.
1296 */
1297 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1298 {
1299 int abblen;
1300 const char *abbrev;
1301 if (len == 40)
1302 return sha1_to_hex(sha1);
1303
1304 abbrev = find_unique_abbrev(sha1, len);
1305 if (!abbrev)
1306 return sha1_to_hex(sha1);
1307 abblen = strlen(abbrev);
1308 if (abblen < 37) {
1309 static char hex[41];
1310 if (len < abblen && abblen <= len + 2)
1311 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1312 else
1313 sprintf(hex, "%s...", abbrev);
1314 return hex;
1315 }
1316 return sha1_to_hex(sha1);
1317 }
1318
1319 static void diff_flush_raw(struct diff_filepair *p,
1320 int line_termination,
1321 int inter_name_termination,
1322 struct diff_options *options,
1323 int output_format)
1324 {
1325 int two_paths;
1326 char status[10];
1327 int abbrev = options->abbrev;
1328 const char *path_one, *path_two;
1329
1330 path_one = p->one->path;
1331 path_two = p->two->path;
1332 if (line_termination) {
1333 path_one = quote_one(path_one);
1334 path_two = quote_one(path_two);
1335 }
1336
1337 if (p->score)
1338 sprintf(status, "%c%03d", p->status,
1339 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1340 else {
1341 status[0] = p->status;
1342 status[1] = 0;
1343 }
1344 switch (p->status) {
1345 case DIFF_STATUS_COPIED:
1346 case DIFF_STATUS_RENAMED:
1347 two_paths = 1;
1348 break;
1349 case DIFF_STATUS_ADDED:
1350 case DIFF_STATUS_DELETED:
1351 two_paths = 0;
1352 break;
1353 default:
1354 two_paths = 0;
1355 break;
1356 }
1357 if (output_format != DIFF_FORMAT_NAME_STATUS) {
1358 printf(":%06o %06o %s ",
1359 p->one->mode, p->two->mode,
1360 diff_unique_abbrev(p->one->sha1, abbrev));
1361 printf("%s ",
1362 diff_unique_abbrev(p->two->sha1, abbrev));
1363 }
1364 printf("%s%c%s", status, inter_name_termination, path_one);
1365 if (two_paths)
1366 printf("%c%s", inter_name_termination, path_two);
1367 putchar(line_termination);
1368 if (path_one != p->one->path)
1369 free((void*)path_one);
1370 if (path_two != p->two->path)
1371 free((void*)path_two);
1372 }
1373
1374 static void diff_flush_name(struct diff_filepair *p,
1375 int inter_name_termination,
1376 int line_termination)
1377 {
1378 char *path = p->two->path;
1379
1380 if (line_termination)
1381 path = quote_one(p->two->path);
1382 else
1383 path = p->two->path;
1384 printf("%s%c", path, line_termination);
1385 if (p->two->path != path)
1386 free(path);
1387 }
1388
1389 int diff_unmodified_pair(struct diff_filepair *p)
1390 {
1391 /* This function is written stricter than necessary to support
1392 * the currently implemented transformers, but the idea is to
1393 * let transformers to produce diff_filepairs any way they want,
1394 * and filter and clean them up here before producing the output.
1395 */
1396 struct diff_filespec *one, *two;
1397
1398 if (DIFF_PAIR_UNMERGED(p))
1399 return 0; /* unmerged is interesting */
1400
1401 one = p->one;
1402 two = p->two;
1403
1404 /* deletion, addition, mode or type change
1405 * and rename are all interesting.
1406 */
1407 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1408 DIFF_PAIR_MODE_CHANGED(p) ||
1409 strcmp(one->path, two->path))
1410 return 0;
1411
1412 /* both are valid and point at the same path. that is, we are
1413 * dealing with a change.
1414 */
1415 if (one->sha1_valid && two->sha1_valid &&
1416 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1417 return 1; /* no change */
1418 if (!one->sha1_valid && !two->sha1_valid)
1419 return 1; /* both look at the same file on the filesystem. */
1420 return 0;
1421 }
1422
1423 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1424 {
1425 if (diff_unmodified_pair(p))
1426 return;
1427
1428 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1429 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1430 return; /* no tree diffs in patch format */
1431
1432 run_diff(p, o);
1433 }
1434
1435 static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
1436 struct diffstat_t *diffstat)
1437 {
1438 if (diff_unmodified_pair(p))
1439 return;
1440
1441 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1442 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1443 return; /* no tree diffs in patch format */
1444
1445 run_diffstat(p, o, diffstat);
1446 }
1447
1448 int diff_queue_is_empty(void)
1449 {
1450 struct diff_queue_struct *q = &diff_queued_diff;
1451 int i;
1452 for (i = 0; i < q->nr; i++)
1453 if (!diff_unmodified_pair(q->queue[i]))
1454 return 0;
1455 return 1;
1456 }
1457
1458 #if DIFF_DEBUG
1459 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1460 {
1461 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1462 x, one ? one : "",
1463 s->path,
1464 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1465 s->mode,
1466 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1467 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1468 x, one ? one : "",
1469 s->size, s->xfrm_flags);
1470 }
1471
1472 void diff_debug_filepair(const struct diff_filepair *p, int i)
1473 {
1474 diff_debug_filespec(p->one, i, "one");
1475 diff_debug_filespec(p->two, i, "two");
1476 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1477 p->score, p->status ? p->status : '?',
1478 p->source_stays, p->broken_pair);
1479 }
1480
1481 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1482 {
1483 int i;
1484 if (msg)
1485 fprintf(stderr, "%s\n", msg);
1486 fprintf(stderr, "q->nr = %d\n", q->nr);
1487 for (i = 0; i < q->nr; i++) {
1488 struct diff_filepair *p = q->queue[i];
1489 diff_debug_filepair(p, i);
1490 }
1491 }
1492 #endif
1493
1494 static void diff_resolve_rename_copy(void)
1495 {
1496 int i, j;
1497 struct diff_filepair *p, *pp;
1498 struct diff_queue_struct *q = &diff_queued_diff;
1499
1500 diff_debug_queue("resolve-rename-copy", q);
1501
1502 for (i = 0; i < q->nr; i++) {
1503 p = q->queue[i];
1504 p->status = 0; /* undecided */
1505 if (DIFF_PAIR_UNMERGED(p))
1506 p->status = DIFF_STATUS_UNMERGED;
1507 else if (!DIFF_FILE_VALID(p->one))
1508 p->status = DIFF_STATUS_ADDED;
1509 else if (!DIFF_FILE_VALID(p->two))
1510 p->status = DIFF_STATUS_DELETED;
1511 else if (DIFF_PAIR_TYPE_CHANGED(p))
1512 p->status = DIFF_STATUS_TYPE_CHANGED;
1513
1514 /* from this point on, we are dealing with a pair
1515 * whose both sides are valid and of the same type, i.e.
1516 * either in-place edit or rename/copy edit.
1517 */
1518 else if (DIFF_PAIR_RENAME(p)) {
1519 if (p->source_stays) {
1520 p->status = DIFF_STATUS_COPIED;
1521 continue;
1522 }
1523 /* See if there is some other filepair that
1524 * copies from the same source as us. If so
1525 * we are a copy. Otherwise we are either a
1526 * copy if the path stays, or a rename if it
1527 * does not, but we already handled "stays" case.
1528 */
1529 for (j = i + 1; j < q->nr; j++) {
1530 pp = q->queue[j];
1531 if (strcmp(pp->one->path, p->one->path))
1532 continue; /* not us */
1533 if (!DIFF_PAIR_RENAME(pp))
1534 continue; /* not a rename/copy */
1535 /* pp is a rename/copy from the same source */
1536 p->status = DIFF_STATUS_COPIED;
1537 break;
1538 }
1539 if (!p->status)
1540 p->status = DIFF_STATUS_RENAMED;
1541 }
1542 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
1543 p->one->mode != p->two->mode)
1544 p->status = DIFF_STATUS_MODIFIED;
1545 else {
1546 /* This is a "no-change" entry and should not
1547 * happen anymore, but prepare for broken callers.
1548 */
1549 error("feeding unmodified %s to diffcore",
1550 p->one->path);
1551 p->status = DIFF_STATUS_UNKNOWN;
1552 }
1553 }
1554 diff_debug_queue("resolve-rename-copy done", q);
1555 }
1556
1557 static void flush_one_pair(struct diff_filepair *p,
1558 int diff_output_format,
1559 struct diff_options *options,
1560 struct diffstat_t *diffstat)
1561 {
1562 int inter_name_termination = '\t';
1563 int line_termination = options->line_termination;
1564 if (!line_termination)
1565 inter_name_termination = 0;
1566
1567 switch (p->status) {
1568 case DIFF_STATUS_UNKNOWN:
1569 break;
1570 case 0:
1571 die("internal error in diff-resolve-rename-copy");
1572 break;
1573 default:
1574 switch (diff_output_format) {
1575 case DIFF_FORMAT_DIFFSTAT:
1576 diff_flush_stat(p, options, diffstat);
1577 break;
1578 case DIFF_FORMAT_PATCH:
1579 diff_flush_patch(p, options);
1580 break;
1581 case DIFF_FORMAT_RAW:
1582 case DIFF_FORMAT_NAME_STATUS:
1583 diff_flush_raw(p, line_termination,
1584 inter_name_termination,
1585 options, diff_output_format);
1586 break;
1587 case DIFF_FORMAT_NAME:
1588 diff_flush_name(p,
1589 inter_name_termination,
1590 line_termination);
1591 break;
1592 case DIFF_FORMAT_NO_OUTPUT:
1593 break;
1594 }
1595 }
1596 }
1597
1598 void diff_flush(struct diff_options *options)
1599 {
1600 struct diff_queue_struct *q = &diff_queued_diff;
1601 int i;
1602 int diff_output_format = options->output_format;
1603 struct diffstat_t *diffstat = NULL;
1604
1605 if (diff_output_format == DIFF_FORMAT_DIFFSTAT || options->with_stat) {
1606 diffstat = xcalloc(sizeof (struct diffstat_t), 1);
1607 diffstat->xm.consume = diffstat_consume;
1608 }
1609
1610 if (options->with_raw) {
1611 for (i = 0; i < q->nr; i++) {
1612 struct diff_filepair *p = q->queue[i];
1613 flush_one_pair(p, DIFF_FORMAT_RAW, options, NULL);
1614 }
1615 putchar(options->line_termination);
1616 }
1617 if (options->with_stat) {
1618 for (i = 0; i < q->nr; i++) {
1619 struct diff_filepair *p = q->queue[i];
1620 flush_one_pair(p, DIFF_FORMAT_DIFFSTAT, options,
1621 diffstat);
1622 }
1623 show_stats(diffstat);
1624 free(diffstat);
1625 diffstat = NULL;
1626 putchar(options->line_termination);
1627 }
1628 for (i = 0; i < q->nr; i++) {
1629 struct diff_filepair *p = q->queue[i];
1630 flush_one_pair(p, diff_output_format, options, diffstat);
1631 diff_free_filepair(p);
1632 }
1633
1634 if (diffstat) {
1635 show_stats(diffstat);
1636 free(diffstat);
1637 }
1638
1639 free(q->queue);
1640 q->queue = NULL;
1641 q->nr = q->alloc = 0;
1642 }
1643
1644 static void diffcore_apply_filter(const char *filter)
1645 {
1646 int i;
1647 struct diff_queue_struct *q = &diff_queued_diff;
1648 struct diff_queue_struct outq;
1649 outq.queue = NULL;
1650 outq.nr = outq.alloc = 0;
1651
1652 if (!filter)
1653 return;
1654
1655 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
1656 int found;
1657 for (i = found = 0; !found && i < q->nr; i++) {
1658 struct diff_filepair *p = q->queue[i];
1659 if (((p->status == DIFF_STATUS_MODIFIED) &&
1660 ((p->score &&
1661 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1662 (!p->score &&
1663 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1664 ((p->status != DIFF_STATUS_MODIFIED) &&
1665 strchr(filter, p->status)))
1666 found++;
1667 }
1668 if (found)
1669 return;
1670
1671 /* otherwise we will clear the whole queue
1672 * by copying the empty outq at the end of this
1673 * function, but first clear the current entries
1674 * in the queue.
1675 */
1676 for (i = 0; i < q->nr; i++)
1677 diff_free_filepair(q->queue[i]);
1678 }
1679 else {
1680 /* Only the matching ones */
1681 for (i = 0; i < q->nr; i++) {
1682 struct diff_filepair *p = q->queue[i];
1683
1684 if (((p->status == DIFF_STATUS_MODIFIED) &&
1685 ((p->score &&
1686 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1687 (!p->score &&
1688 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1689 ((p->status != DIFF_STATUS_MODIFIED) &&
1690 strchr(filter, p->status)))
1691 diff_q(&outq, p);
1692 else
1693 diff_free_filepair(p);
1694 }
1695 }
1696 free(q->queue);
1697 *q = outq;
1698 }
1699
1700 void diffcore_std(struct diff_options *options)
1701 {
1702 if (options->break_opt != -1)
1703 diffcore_break(options->break_opt);
1704 if (options->detect_rename)
1705 diffcore_rename(options);
1706 if (options->break_opt != -1)
1707 diffcore_merge_broken();
1708 if (options->pickaxe)
1709 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1710 if (options->orderfile)
1711 diffcore_order(options->orderfile);
1712 diff_resolve_rename_copy();
1713 diffcore_apply_filter(options->filter);
1714 }
1715
1716
1717 void diffcore_std_no_resolve(struct diff_options *options)
1718 {
1719 if (options->pickaxe)
1720 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1721 if (options->orderfile)
1722 diffcore_order(options->orderfile);
1723 diffcore_apply_filter(options->filter);
1724 }
1725
1726 void diff_addremove(struct diff_options *options,
1727 int addremove, unsigned mode,
1728 const unsigned char *sha1,
1729 const char *base, const char *path)
1730 {
1731 char concatpath[PATH_MAX];
1732 struct diff_filespec *one, *two;
1733
1734 /* This may look odd, but it is a preparation for
1735 * feeding "there are unchanged files which should
1736 * not produce diffs, but when you are doing copy
1737 * detection you would need them, so here they are"
1738 * entries to the diff-core. They will be prefixed
1739 * with something like '=' or '*' (I haven't decided
1740 * which but should not make any difference).
1741 * Feeding the same new and old to diff_change()
1742 * also has the same effect.
1743 * Before the final output happens, they are pruned after
1744 * merged into rename/copy pairs as appropriate.
1745 */
1746 if (options->reverse_diff)
1747 addremove = (addremove == '+' ? '-' :
1748 addremove == '-' ? '+' : addremove);
1749
1750 if (!path) path = "";
1751 sprintf(concatpath, "%s%s", base, path);
1752 one = alloc_filespec(concatpath);
1753 two = alloc_filespec(concatpath);
1754
1755 if (addremove != '+')
1756 fill_filespec(one, sha1, mode);
1757 if (addremove != '-')
1758 fill_filespec(two, sha1, mode);
1759
1760 diff_queue(&diff_queued_diff, one, two);
1761 }
1762
1763 void diff_change(struct diff_options *options,
1764 unsigned old_mode, unsigned new_mode,
1765 const unsigned char *old_sha1,
1766 const unsigned char *new_sha1,
1767 const char *base, const char *path)
1768 {
1769 char concatpath[PATH_MAX];
1770 struct diff_filespec *one, *two;
1771
1772 if (options->reverse_diff) {
1773 unsigned tmp;
1774 const unsigned char *tmp_c;
1775 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
1776 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
1777 }
1778 if (!path) path = "";
1779 sprintf(concatpath, "%s%s", base, path);
1780 one = alloc_filespec(concatpath);
1781 two = alloc_filespec(concatpath);
1782 fill_filespec(one, old_sha1, old_mode);
1783 fill_filespec(two, new_sha1, new_mode);
1784
1785 diff_queue(&diff_queued_diff, one, two);
1786 }
1787
1788 void diff_unmerge(struct diff_options *options,
1789 const char *path)
1790 {
1791 struct diff_filespec *one, *two;
1792 one = alloc_filespec(path);
1793 two = alloc_filespec(path);
1794 diff_queue(&diff_queued_diff, one, two);
1795 }
git with Jakub Narębski modifications