2 * Copyright (C) 2005 Junio C Hamano
11 #include "xdiff/xdiff.h"
13 static int use_size_cache;
15 int diff_rename_limit_default = -1;
17 int git_diff_config(const char *var, const char *value)
19 if (!strcmp(var, "diff.renamelimit")) {
20 diff_rename_limit_default = git_config_int(var, value);
24 return git_default_config(var, value);
27 static char *quote_one(const char *str)
34 needlen = quote_c_style(str, NULL, NULL, 0);
37 xp = xmalloc(needlen + 1);
38 quote_c_style(str, xp, NULL, 0);
42 static char *quote_two(const char *one, const char *two)
44 int need_one = quote_c_style(one, NULL, NULL, 1);
45 int need_two = quote_c_style(two, NULL, NULL, 1);
48 if (need_one + need_two) {
49 if (!need_one) need_one = strlen(one);
50 if (!need_two) need_one = strlen(two);
52 xp = xmalloc(need_one + need_two + 3);
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, "\"");
59 need_one = strlen(one);
60 need_two = strlen(two);
61 xp = xmalloc(need_one + need_two + 1);
63 strcpy(xp + need_one, two);
67 static const char *external_diff(void)
69 static const char *external_diff_cmd = NULL;
70 static int done_preparing = 0;
73 return external_diff_cmd;
74 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
76 return external_diff_cmd;
79 #define TEMPFILE_PATH_LEN 50
81 static struct diff_tempfile {
82 const char *name; /* filename external diff should read from */
85 char tmp_path[TEMPFILE_PATH_LEN];
88 static int count_lines(const char *data, int size)
90 int count, ch, completely_empty = 1, nl_just_seen = 0;
101 completely_empty = 0;
104 if (completely_empty)
107 count++; /* no trailing newline */
111 static void print_line_count(int count)
121 printf("1,%d", count);
126 static void copy_file(int prefix, const char *data, int size)
128 int ch, nl_just_seen = 1;
140 printf("\n\\ No newline at end of file\n");
143 static void emit_rewrite_diff(const char *name_a,
145 struct diff_filespec *one,
146 struct diff_filespec *two)
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);
156 print_line_count(lc_b);
159 copy_file('-', one->data, one->size);
161 copy_file('+', two->data, two->size);
164 static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
166 if (!DIFF_FILE_VALID(one)) {
167 mf->ptr = ""; /* does not matter */
171 else if (diff_populate_filespec(one, 0))
174 mf->size = one->size;
178 struct emit_callback {
179 const char **label_path;
182 static int fn_out(void *priv, mmbuffer_t *mb, int nbuf)
185 struct emit_callback *ecbdata = priv;
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;
192 for (i = 0; i < nbuf; i++)
193 if (!fwrite(mb[i].ptr, mb[i].size, 1, stdout))
198 #define FIRST_FEW_BYTES 8000
199 static int mmfile_is_binary(mmfile_t *mf)
202 if (FIRST_FEW_BYTES < sz)
203 sz = FIRST_FEW_BYTES;
204 if (memchr(mf->ptr, 0, sz))
209 static void builtin_diff(const char *name_a,
211 struct diff_filespec *one,
212 struct diff_filespec *two,
213 const char *xfrm_msg,
214 int complete_rewrite)
220 a_one = quote_two("a/", name_a);
221 b_two = quote_two("b/", name_b);
222 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
223 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
224 printf("diff --git %s %s\n", a_one, b_two);
225 if (lbl[0][0] == '/') {
227 printf("new file mode %06o\n", two->mode);
228 if (xfrm_msg && xfrm_msg[0])
231 else if (lbl[1][0] == '/') {
232 printf("deleted file mode %06o\n", one->mode);
233 if (xfrm_msg && xfrm_msg[0])
237 if (one->mode != two->mode) {
238 printf("old mode %06o\n", one->mode);
239 printf("new mode %06o\n", two->mode);
241 if (xfrm_msg && xfrm_msg[0])
244 * we do not run diff between different kind
247 if ((one->mode ^ two->mode) & S_IFMT)
248 goto free_ab_and_return;
249 if (complete_rewrite) {
250 emit_rewrite_diff(name_a, name_b, one, two);
251 goto free_ab_and_return;
255 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
256 die("unable to read files to diff");
258 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
259 printf("Binary files %s and %s differ\n", lbl[0], lbl[1]);
261 /* Crazy xdl interfaces.. */
262 const char *diffopts = getenv("GIT_DIFF_OPTS");
266 struct emit_callback ecbdata;
268 ecbdata.label_path = lbl;
269 xpp.flags = XDF_NEED_MINIMAL;
271 xecfg.flags = XDL_EMIT_FUNCNAMES;
274 else if (!strncmp(diffopts, "--unified=", 10))
275 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
276 else if (!strncmp(diffopts, "-u", 2))
277 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
280 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
289 struct diff_filespec *alloc_filespec(const char *path)
291 int namelen = strlen(path);
292 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
294 memset(spec, 0, sizeof(*spec));
295 spec->path = (char *)(spec + 1);
296 memcpy(spec->path, path, namelen+1);
300 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
304 spec->mode = canon_mode(mode);
305 memcpy(spec->sha1, sha1, 20);
306 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
311 * Given a name and sha1 pair, if the dircache tells us the file in
312 * the work tree has that object contents, return true, so that
313 * prepare_temp_file() does not have to inflate and extract.
315 static int work_tree_matches(const char *name, const unsigned char *sha1)
317 struct cache_entry *ce;
321 /* We do not read the cache ourselves here, because the
322 * benchmark with my previous version that always reads cache
323 * shows that it makes things worse for diff-tree comparing
324 * two linux-2.6 kernel trees in an already checked out work
325 * tree. This is because most diff-tree comparisons deal with
326 * only a small number of files, while reading the cache is
327 * expensive for a large project, and its cost outweighs the
328 * savings we get by not inflating the object to a temporary
329 * file. Practically, this code only helps when we are used
330 * by diff-cache --cached, which does read the cache before
337 pos = cache_name_pos(name, len);
340 ce = active_cache[pos];
341 if ((lstat(name, &st) < 0) ||
342 !S_ISREG(st.st_mode) || /* careful! */
343 ce_match_stat(ce, &st, 0) ||
344 memcmp(sha1, ce->sha1, 20))
346 /* we return 1 only when we can stat, it is a regular file,
347 * stat information matches, and sha1 recorded in the cache
348 * matches. I.e. we know the file in the work tree really is
349 * the same as the <name, sha1> pair.
354 static struct sha1_size_cache {
355 unsigned char sha1[20];
358 static int sha1_size_cache_nr, sha1_size_cache_alloc;
360 static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
365 struct sha1_size_cache *e;
368 last = sha1_size_cache_nr;
369 while (last > first) {
370 int cmp, next = (last + first) >> 1;
371 e = sha1_size_cache[next];
372 cmp = memcmp(e->sha1, sha1, 20);
384 /* insert to make it at "first" */
385 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
386 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
387 sha1_size_cache = xrealloc(sha1_size_cache,
388 sha1_size_cache_alloc *
389 sizeof(*sha1_size_cache));
391 sha1_size_cache_nr++;
392 if (first < sha1_size_cache_nr)
393 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
394 (sha1_size_cache_nr - first - 1) *
395 sizeof(*sha1_size_cache));
396 e = xmalloc(sizeof(struct sha1_size_cache));
397 sha1_size_cache[first] = e;
398 memcpy(e->sha1, sha1, 20);
404 * While doing rename detection and pickaxe operation, we may need to
405 * grab the data for the blob (or file) for our own in-core comparison.
406 * diff_filespec has data and size fields for this purpose.
408 int diff_populate_filespec(struct diff_filespec *s, int size_only)
411 if (!DIFF_FILE_VALID(s))
412 die("internal error: asking to populate invalid file.");
413 if (S_ISDIR(s->mode))
421 if (!s->sha1_valid ||
422 work_tree_matches(s->path, s->sha1)) {
425 if (lstat(s->path, &st) < 0) {
426 if (errno == ENOENT) {
435 s->size = st.st_size;
440 if (S_ISLNK(st.st_mode)) {
442 s->data = xmalloc(s->size);
444 ret = readlink(s->path, s->data, s->size);
451 fd = open(s->path, O_RDONLY);
454 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
456 if (s->data == MAP_FAILED)
458 s->should_munmap = 1;
462 struct sha1_size_cache *e;
465 e = locate_size_cache(s->sha1, 1, 0);
470 if (!sha1_object_info(s->sha1, type, &s->size))
471 locate_size_cache(s->sha1, 0, s->size);
474 s->data = read_sha1_file(s->sha1, type, &s->size);
481 void diff_free_filespec_data(struct diff_filespec *s)
485 else if (s->should_munmap)
486 munmap(s->data, s->size);
487 s->should_free = s->should_munmap = 0;
493 static void prep_temp_blob(struct diff_tempfile *temp,
496 const unsigned char *sha1,
501 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
503 die("unable to create temp-file");
504 if (write(fd, blob, size) != size)
505 die("unable to write temp-file");
507 temp->name = temp->tmp_path;
508 strcpy(temp->hex, sha1_to_hex(sha1));
510 sprintf(temp->mode, "%06o", mode);
513 static void prepare_temp_file(const char *name,
514 struct diff_tempfile *temp,
515 struct diff_filespec *one)
517 if (!DIFF_FILE_VALID(one)) {
519 /* A '-' entry produces this for file-2, and
520 * a '+' entry produces this for file-1.
522 temp->name = "/dev/null";
523 strcpy(temp->hex, ".");
524 strcpy(temp->mode, ".");
528 if (!one->sha1_valid ||
529 work_tree_matches(name, one->sha1)) {
531 if (lstat(name, &st) < 0) {
533 goto not_a_valid_file;
534 die("stat(%s): %s", name, strerror(errno));
536 if (S_ISLNK(st.st_mode)) {
538 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
539 if (sizeof(buf) <= st.st_size)
540 die("symlink too long: %s", name);
541 ret = readlink(name, buf, st.st_size);
543 die("readlink(%s)", name);
544 prep_temp_blob(temp, buf, st.st_size,
546 one->sha1 : null_sha1),
548 one->mode : S_IFLNK));
551 /* we can borrow from the file in the work tree */
553 if (!one->sha1_valid)
554 strcpy(temp->hex, sha1_to_hex(null_sha1));
556 strcpy(temp->hex, sha1_to_hex(one->sha1));
557 /* Even though we may sometimes borrow the
558 * contents from the work tree, we always want
559 * one->mode. mode is trustworthy even when
560 * !(one->sha1_valid), as long as
561 * DIFF_FILE_VALID(one).
563 sprintf(temp->mode, "%06o", one->mode);
568 if (diff_populate_filespec(one, 0))
569 die("cannot read data blob for %s", one->path);
570 prep_temp_blob(temp, one->data, one->size,
571 one->sha1, one->mode);
575 static void remove_tempfile(void)
579 for (i = 0; i < 2; i++)
580 if (diff_temp[i].name == diff_temp[i].tmp_path) {
581 unlink(diff_temp[i].name);
582 diff_temp[i].name = NULL;
586 static void remove_tempfile_on_signal(int signo)
589 signal(SIGINT, SIG_DFL);
593 static int spawn_prog(const char *pgm, const char **arg)
601 die("unable to fork");
603 execvp(pgm, (char *const*) arg);
607 while (waitpid(pid, &status, 0) < 0) {
613 /* Earlier we did not check the exit status because
614 * diff exits non-zero if files are different, and
615 * we are not interested in knowing that. It was a
616 * mistake which made it harder to quit a diff-*
617 * session that uses the git-apply-patch-script as
618 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
619 * should also exit non-zero only when it wants to
620 * abort the entire diff-* session.
622 if (WIFEXITED(status) && !WEXITSTATUS(status))
627 /* An external diff command takes:
629 * diff-cmd name infile1 infile1-sha1 infile1-mode \
630 * infile2 infile2-sha1 infile2-mode [ rename-to ]
633 static void run_external_diff(const char *pgm,
636 struct diff_filespec *one,
637 struct diff_filespec *two,
638 const char *xfrm_msg,
639 int complete_rewrite)
641 const char *spawn_arg[10];
642 struct diff_tempfile *temp = diff_temp;
644 static int atexit_asked = 0;
645 const char *othername;
646 const char **arg = &spawn_arg[0];
648 othername = (other? other : name);
650 prepare_temp_file(name, &temp[0], one);
651 prepare_temp_file(othername, &temp[1], two);
652 if (! atexit_asked &&
653 (temp[0].name == temp[0].tmp_path ||
654 temp[1].name == temp[1].tmp_path)) {
656 atexit(remove_tempfile);
658 signal(SIGINT, remove_tempfile_on_signal);
664 *arg++ = temp[0].name;
665 *arg++ = temp[0].hex;
666 *arg++ = temp[0].mode;
667 *arg++ = temp[1].name;
668 *arg++ = temp[1].hex;
669 *arg++ = temp[1].mode;
679 retval = spawn_prog(pgm, spawn_arg);
682 fprintf(stderr, "external diff died, stopping at %s.\n", name);
687 static void run_diff_cmd(const char *pgm,
690 struct diff_filespec *one,
691 struct diff_filespec *two,
692 const char *xfrm_msg,
693 int complete_rewrite)
696 run_external_diff(pgm, name, other, one, two, xfrm_msg,
701 builtin_diff(name, other ? other : name,
702 one, two, xfrm_msg, complete_rewrite);
704 printf("* Unmerged path %s\n", name);
707 static void diff_fill_sha1_info(struct diff_filespec *one)
709 if (DIFF_FILE_VALID(one)) {
710 if (!one->sha1_valid) {
712 if (lstat(one->path, &st) < 0)
713 die("stat %s", one->path);
714 if (index_path(one->sha1, one->path, &st, 0))
715 die("cannot hash %s\n", one->path);
719 memset(one->sha1, 0, 20);
722 static void run_diff(struct diff_filepair *p, struct diff_options *o)
724 const char *pgm = external_diff();
725 char msg[PATH_MAX*2+300], *xfrm_msg;
726 struct diff_filespec *one;
727 struct diff_filespec *two;
730 char *name_munged, *other_munged;
731 int complete_rewrite = 0;
734 if (DIFF_PAIR_UNMERGED(p)) {
736 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, 0);
741 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
742 name_munged = quote_one(name);
743 other_munged = quote_one(other);
744 one = p->one; two = p->two;
746 diff_fill_sha1_info(one);
747 diff_fill_sha1_info(two);
751 case DIFF_STATUS_COPIED:
752 len += snprintf(msg + len, sizeof(msg) - len,
753 "similarity index %d%%\n"
756 (int)(0.5 + p->score * 100.0/MAX_SCORE),
757 name_munged, other_munged);
759 case DIFF_STATUS_RENAMED:
760 len += snprintf(msg + len, sizeof(msg) - len,
761 "similarity index %d%%\n"
764 (int)(0.5 + p->score * 100.0/MAX_SCORE),
765 name_munged, other_munged);
767 case DIFF_STATUS_MODIFIED:
769 len += snprintf(msg + len, sizeof(msg) - len,
770 "dissimilarity index %d%%\n",
771 (int)(0.5 + p->score *
773 complete_rewrite = 1;
782 if (memcmp(one->sha1, two->sha1, 20)) {
784 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
785 memcpy(one_sha1, sha1_to_hex(one->sha1), 41);
787 len += snprintf(msg + len, sizeof(msg) - len,
789 abbrev, one_sha1, abbrev,
790 sha1_to_hex(two->sha1));
791 if (one->mode == two->mode)
792 len += snprintf(msg + len, sizeof(msg) - len,
794 len += snprintf(msg + len, sizeof(msg) - len, "\n");
799 xfrm_msg = len ? msg : NULL;
802 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
803 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
804 /* a filepair that changes between file and symlink
805 * needs to be split into deletion and creation.
807 struct diff_filespec *null = alloc_filespec(two->path);
808 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, 0);
810 null = alloc_filespec(one->path);
811 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, 0);
815 run_diff_cmd(pgm, name, other, one, two, xfrm_msg,
822 void diff_setup(struct diff_options *options)
824 memset(options, 0, sizeof(*options));
825 options->output_format = DIFF_FORMAT_RAW;
826 options->line_termination = '\n';
827 options->break_opt = -1;
828 options->rename_limit = -1;
830 options->change = diff_change;
831 options->add_remove = diff_addremove;
834 int diff_setup_done(struct diff_options *options)
836 if ((options->find_copies_harder &&
837 options->detect_rename != DIFF_DETECT_COPY) ||
838 (0 <= options->rename_limit && !options->detect_rename))
840 if (options->detect_rename && options->rename_limit < 0)
841 options->rename_limit = diff_rename_limit_default;
842 if (options->setup & DIFF_SETUP_USE_CACHE) {
844 /* read-cache does not die even when it fails
845 * so it is safe for us to do this here. Also
846 * it does not smudge active_cache or active_nr
847 * when it fails, so we do not have to worry about
848 * cleaning it up ourselves either.
852 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
854 if (options->abbrev <= 0 || 40 < options->abbrev)
855 options->abbrev = 40; /* full */
860 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
862 const char *arg = av[0];
863 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
864 options->output_format = DIFF_FORMAT_PATCH;
865 else if (!strcmp(arg, "--patch-with-raw")) {
866 options->output_format = DIFF_FORMAT_PATCH;
867 options->with_raw = 1;
869 else if (!strcmp(arg, "-z"))
870 options->line_termination = 0;
871 else if (!strncmp(arg, "-l", 2))
872 options->rename_limit = strtoul(arg+2, NULL, 10);
873 else if (!strcmp(arg, "--full-index"))
874 options->full_index = 1;
875 else if (!strcmp(arg, "--name-only"))
876 options->output_format = DIFF_FORMAT_NAME;
877 else if (!strcmp(arg, "--name-status"))
878 options->output_format = DIFF_FORMAT_NAME_STATUS;
879 else if (!strcmp(arg, "-R"))
880 options->reverse_diff = 1;
881 else if (!strncmp(arg, "-S", 2))
882 options->pickaxe = arg + 2;
883 else if (!strcmp(arg, "-s"))
884 options->output_format = DIFF_FORMAT_NO_OUTPUT;
885 else if (!strncmp(arg, "-O", 2))
886 options->orderfile = arg + 2;
887 else if (!strncmp(arg, "--diff-filter=", 14))
888 options->filter = arg + 14;
889 else if (!strcmp(arg, "--pickaxe-all"))
890 options->pickaxe_opts = DIFF_PICKAXE_ALL;
891 else if (!strcmp(arg, "--pickaxe-regex"))
892 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
893 else if (!strncmp(arg, "-B", 2)) {
894 if ((options->break_opt =
895 diff_scoreopt_parse(arg)) == -1)
898 else if (!strncmp(arg, "-M", 2)) {
899 if ((options->rename_score =
900 diff_scoreopt_parse(arg)) == -1)
902 options->detect_rename = DIFF_DETECT_RENAME;
904 else if (!strncmp(arg, "-C", 2)) {
905 if ((options->rename_score =
906 diff_scoreopt_parse(arg)) == -1)
908 options->detect_rename = DIFF_DETECT_COPY;
910 else if (!strcmp(arg, "--find-copies-harder"))
911 options->find_copies_harder = 1;
912 else if (!strcmp(arg, "--abbrev"))
913 options->abbrev = DEFAULT_ABBREV;
914 else if (!strncmp(arg, "--abbrev=", 9)) {
915 options->abbrev = strtoul(arg + 9, NULL, 10);
916 if (options->abbrev < MINIMUM_ABBREV)
917 options->abbrev = MINIMUM_ABBREV;
918 else if (40 < options->abbrev)
919 options->abbrev = 40;
926 static int parse_num(const char **cp_p)
928 unsigned long num, scale;
930 const char *cp = *cp_p;
937 if ( !dot && ch == '.' ) {
940 } else if ( ch == '%' ) {
941 scale = dot ? scale*100 : 100;
942 cp++; /* % is always at the end */
944 } else if ( ch >= '0' && ch <= '9' ) {
945 if ( scale < 100000 ) {
947 num = (num*10) + (ch-'0');
956 /* user says num divided by scale and we say internally that
957 * is MAX_SCORE * num / scale.
959 return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
962 int diff_scoreopt_parse(const char *opt)
969 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
970 return -1; /* that is not a -M, -C nor -B option */
972 opt1 = parse_num(&opt);
978 else if (*opt != '/')
979 return -1; /* we expect -B80/99 or -B80 */
982 opt2 = parse_num(&opt);
987 return opt1 | (opt2 << 16);
990 struct diff_queue_struct diff_queued_diff;
992 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
994 if (queue->alloc <= queue->nr) {
995 queue->alloc = alloc_nr(queue->alloc);
996 queue->queue = xrealloc(queue->queue,
997 sizeof(dp) * queue->alloc);
999 queue->queue[queue->nr++] = dp;
1002 struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
1003 struct diff_filespec *one,
1004 struct diff_filespec *two)
1006 struct diff_filepair *dp = xmalloc(sizeof(*dp));
1011 dp->source_stays = 0;
1012 dp->broken_pair = 0;
1018 void diff_free_filepair(struct diff_filepair *p)
1020 diff_free_filespec_data(p->one);
1021 diff_free_filespec_data(p->two);
1027 /* This is different from find_unique_abbrev() in that
1028 * it stuffs the result with dots for alignment.
1030 const char *diff_unique_abbrev(const unsigned char *sha1, int len)
1035 return sha1_to_hex(sha1);
1037 abbrev = find_unique_abbrev(sha1, len);
1039 return sha1_to_hex(sha1);
1040 abblen = strlen(abbrev);
1042 static char hex[41];
1043 if (len < abblen && abblen <= len + 2)
1044 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
1046 sprintf(hex, "%s...", abbrev);
1049 return sha1_to_hex(sha1);
1052 static void diff_flush_raw(struct diff_filepair *p,
1053 int line_termination,
1054 int inter_name_termination,
1055 struct diff_options *options,
1060 int abbrev = options->abbrev;
1061 const char *path_one, *path_two;
1063 path_one = p->one->path;
1064 path_two = p->two->path;
1065 if (line_termination) {
1066 path_one = quote_one(path_one);
1067 path_two = quote_one(path_two);
1071 sprintf(status, "%c%03d", p->status,
1072 (int)(0.5 + p->score * 100.0/MAX_SCORE));
1074 status[0] = p->status;
1077 switch (p->status) {
1078 case DIFF_STATUS_COPIED:
1079 case DIFF_STATUS_RENAMED:
1082 case DIFF_STATUS_ADDED:
1083 case DIFF_STATUS_DELETED:
1090 if (output_format != DIFF_FORMAT_NAME_STATUS) {
1091 printf(":%06o %06o %s ",
1092 p->one->mode, p->two->mode,
1093 diff_unique_abbrev(p->one->sha1, abbrev));
1095 diff_unique_abbrev(p->two->sha1, abbrev));
1097 printf("%s%c%s", status, inter_name_termination, path_one);
1099 printf("%c%s", inter_name_termination, path_two);
1100 putchar(line_termination);
1101 if (path_one != p->one->path)
1102 free((void*)path_one);
1103 if (path_two != p->two->path)
1104 free((void*)path_two);
1107 static void diff_flush_name(struct diff_filepair *p,
1108 int inter_name_termination,
1109 int line_termination)
1111 char *path = p->two->path;
1113 if (line_termination)
1114 path = quote_one(p->two->path);
1116 path = p->two->path;
1117 printf("%s%c", path, line_termination);
1118 if (p->two->path != path)
1122 int diff_unmodified_pair(struct diff_filepair *p)
1124 /* This function is written stricter than necessary to support
1125 * the currently implemented transformers, but the idea is to
1126 * let transformers to produce diff_filepairs any way they want,
1127 * and filter and clean them up here before producing the output.
1129 struct diff_filespec *one, *two;
1131 if (DIFF_PAIR_UNMERGED(p))
1132 return 0; /* unmerged is interesting */
1137 /* deletion, addition, mode or type change
1138 * and rename are all interesting.
1140 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
1141 DIFF_PAIR_MODE_CHANGED(p) ||
1142 strcmp(one->path, two->path))
1145 /* both are valid and point at the same path. that is, we are
1146 * dealing with a change.
1148 if (one->sha1_valid && two->sha1_valid &&
1149 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
1150 return 1; /* no change */
1151 if (!one->sha1_valid && !two->sha1_valid)
1152 return 1; /* both look at the same file on the filesystem. */
1156 static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
1158 if (diff_unmodified_pair(p))
1161 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
1162 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
1163 return; /* no tree diffs in patch format */
1168 int diff_queue_is_empty(void)
1170 struct diff_queue_struct *q = &diff_queued_diff;
1172 for (i = 0; i < q->nr; i++)
1173 if (!diff_unmodified_pair(q->queue[i]))
1179 void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
1181 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
1184 DIFF_FILE_VALID(s) ? "valid" : "invalid",
1186 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
1187 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
1189 s->size, s->xfrm_flags);
1192 void diff_debug_filepair(const struct diff_filepair *p, int i)
1194 diff_debug_filespec(p->one, i, "one");
1195 diff_debug_filespec(p->two, i, "two");
1196 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
1197 p->score, p->status ? p->status : '?',
1198 p->source_stays, p->broken_pair);
1201 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
1205 fprintf(stderr, "%s\n", msg);
1206 fprintf(stderr, "q->nr = %d\n", q->nr);
1207 for (i = 0; i < q->nr; i++) {
1208 struct diff_filepair *p = q->queue[i];
1209 diff_debug_filepair(p, i);
1214 static void diff_resolve_rename_copy(void)
1217 struct diff_filepair *p, *pp;
1218 struct diff_queue_struct *q = &diff_queued_diff;
1220 diff_debug_queue("resolve-rename-copy", q);
1222 for (i = 0; i < q->nr; i++) {
1224 p->status = 0; /* undecided */
1225 if (DIFF_PAIR_UNMERGED(p))
1226 p->status = DIFF_STATUS_UNMERGED;
1227 else if (!DIFF_FILE_VALID(p->one))
1228 p->status = DIFF_STATUS_ADDED;
1229 else if (!DIFF_FILE_VALID(p->two))
1230 p->status = DIFF_STATUS_DELETED;
1231 else if (DIFF_PAIR_TYPE_CHANGED(p))
1232 p->status = DIFF_STATUS_TYPE_CHANGED;
1234 /* from this point on, we are dealing with a pair
1235 * whose both sides are valid and of the same type, i.e.
1236 * either in-place edit or rename/copy edit.
1238 else if (DIFF_PAIR_RENAME(p)) {
1239 if (p->source_stays) {
1240 p->status = DIFF_STATUS_COPIED;
1243 /* See if there is some other filepair that
1244 * copies from the same source as us. If so
1245 * we are a copy. Otherwise we are either a
1246 * copy if the path stays, or a rename if it
1247 * does not, but we already handled "stays" case.
1249 for (j = i + 1; j < q->nr; j++) {
1251 if (strcmp(pp->one->path, p->one->path))
1252 continue; /* not us */
1253 if (!DIFF_PAIR_RENAME(pp))
1254 continue; /* not a rename/copy */
1255 /* pp is a rename/copy from the same source */
1256 p->status = DIFF_STATUS_COPIED;
1260 p->status = DIFF_STATUS_RENAMED;
1262 else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
1263 p->one->mode != p->two->mode)
1264 p->status = DIFF_STATUS_MODIFIED;
1266 /* This is a "no-change" entry and should not
1267 * happen anymore, but prepare for broken callers.
1269 error("feeding unmodified %s to diffcore",
1271 p->status = DIFF_STATUS_UNKNOWN;
1274 diff_debug_queue("resolve-rename-copy done", q);
1277 static void flush_one_pair(struct diff_filepair *p,
1278 int diff_output_format,
1279 struct diff_options *options)
1281 int inter_name_termination = '\t';
1282 int line_termination = options->line_termination;
1283 if (!line_termination)
1284 inter_name_termination = 0;
1286 switch (p->status) {
1287 case DIFF_STATUS_UNKNOWN:
1290 die("internal error in diff-resolve-rename-copy");
1293 switch (diff_output_format) {
1294 case DIFF_FORMAT_PATCH:
1295 diff_flush_patch(p, options);
1297 case DIFF_FORMAT_RAW:
1298 case DIFF_FORMAT_NAME_STATUS:
1299 diff_flush_raw(p, line_termination,
1300 inter_name_termination,
1301 options, diff_output_format);
1303 case DIFF_FORMAT_NAME:
1305 inter_name_termination,
1308 case DIFF_FORMAT_NO_OUTPUT:
1314 void diff_flush(struct diff_options *options)
1316 struct diff_queue_struct *q = &diff_queued_diff;
1318 int diff_output_format = options->output_format;
1320 if (options->with_raw) {
1321 for (i = 0; i < q->nr; i++) {
1322 struct diff_filepair *p = q->queue[i];
1323 flush_one_pair(p, DIFF_FORMAT_RAW, options);
1325 putchar(options->line_termination);
1327 for (i = 0; i < q->nr; i++) {
1328 struct diff_filepair *p = q->queue[i];
1329 flush_one_pair(p, diff_output_format, options);
1330 diff_free_filepair(p);
1334 q->nr = q->alloc = 0;
1337 static void diffcore_apply_filter(const char *filter)
1340 struct diff_queue_struct *q = &diff_queued_diff;
1341 struct diff_queue_struct outq;
1343 outq.nr = outq.alloc = 0;
1348 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
1350 for (i = found = 0; !found && i < q->nr; i++) {
1351 struct diff_filepair *p = q->queue[i];
1352 if (((p->status == DIFF_STATUS_MODIFIED) &&
1354 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1356 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1357 ((p->status != DIFF_STATUS_MODIFIED) &&
1358 strchr(filter, p->status)))
1364 /* otherwise we will clear the whole queue
1365 * by copying the empty outq at the end of this
1366 * function, but first clear the current entries
1369 for (i = 0; i < q->nr; i++)
1370 diff_free_filepair(q->queue[i]);
1373 /* Only the matching ones */
1374 for (i = 0; i < q->nr; i++) {
1375 struct diff_filepair *p = q->queue[i];
1377 if (((p->status == DIFF_STATUS_MODIFIED) &&
1379 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
1381 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
1382 ((p->status != DIFF_STATUS_MODIFIED) &&
1383 strchr(filter, p->status)))
1386 diff_free_filepair(p);
1393 void diffcore_std(struct diff_options *options)
1395 if (options->break_opt != -1)
1396 diffcore_break(options->break_opt);
1397 if (options->detect_rename)
1398 diffcore_rename(options);
1399 if (options->break_opt != -1)
1400 diffcore_merge_broken();
1401 if (options->pickaxe)
1402 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1403 if (options->orderfile)
1404 diffcore_order(options->orderfile);
1405 diff_resolve_rename_copy();
1406 diffcore_apply_filter(options->filter);
1410 void diffcore_std_no_resolve(struct diff_options *options)
1412 if (options->pickaxe)
1413 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
1414 if (options->orderfile)
1415 diffcore_order(options->orderfile);
1416 diffcore_apply_filter(options->filter);
1419 void diff_addremove(struct diff_options *options,
1420 int addremove, unsigned mode,
1421 const unsigned char *sha1,
1422 const char *base, const char *path)
1424 char concatpath[PATH_MAX];
1425 struct diff_filespec *one, *two;
1427 /* This may look odd, but it is a preparation for
1428 * feeding "there are unchanged files which should
1429 * not produce diffs, but when you are doing copy
1430 * detection you would need them, so here they are"
1431 * entries to the diff-core. They will be prefixed
1432 * with something like '=' or '*' (I haven't decided
1433 * which but should not make any difference).
1434 * Feeding the same new and old to diff_change()
1435 * also has the same effect.
1436 * Before the final output happens, they are pruned after
1437 * merged into rename/copy pairs as appropriate.
1439 if (options->reverse_diff)
1440 addremove = (addremove == '+' ? '-' :
1441 addremove == '-' ? '+' : addremove);
1443 if (!path) path = "";
1444 sprintf(concatpath, "%s%s", base, path);
1445 one = alloc_filespec(concatpath);
1446 two = alloc_filespec(concatpath);
1448 if (addremove != '+')
1449 fill_filespec(one, sha1, mode);
1450 if (addremove != '-')
1451 fill_filespec(two, sha1, mode);
1453 diff_queue(&diff_queued_diff, one, two);
1456 void diff_change(struct diff_options *options,
1457 unsigned old_mode, unsigned new_mode,
1458 const unsigned char *old_sha1,
1459 const unsigned char *new_sha1,
1460 const char *base, const char *path)
1462 char concatpath[PATH_MAX];
1463 struct diff_filespec *one, *two;
1465 if (options->reverse_diff) {
1467 const unsigned char *tmp_c;
1468 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
1469 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
1471 if (!path) path = "";
1472 sprintf(concatpath, "%s%s", base, path);
1473 one = alloc_filespec(concatpath);
1474 two = alloc_filespec(concatpath);
1475 fill_filespec(one, old_sha1, old_mode);
1476 fill_filespec(two, new_sha1, new_mode);
1478 diff_queue(&diff_queued_diff, one, two);
1481 void diff_unmerge(struct diff_options *options,
1484 struct diff_filespec *one, *two;
1485 one = alloc_filespec(path);
1486 two = alloc_filespec(path);
1487 diff_queue(&diff_queued_diff, one, two);