[PATCH] Adjust show-files test for dotfiles.
[git/git.git] / diff.c
CommitLineData
be3cfa85
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4#include <sys/types.h>
5#include <sys/wait.h>
532149d7 6#include <signal.h>
86436c28
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7#include "cache.h"
8#include "diff.h"
427dcb4b 9#include "diffcore.h"
86436c28 10
d19938ab 11static const char *diff_opts = "-pu";
5c97558c 12static unsigned char null_sha1[20] = { 0, };
427dcb4b 13
427dcb4b 14static int reverse_diff;
86436c28 15
be3cfa85 16static const char *external_diff(void)
86436c28 17{
d19938ab 18 static const char *external_diff_cmd = NULL;
be3cfa85
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19 static int done_preparing = 0;
20
21 if (done_preparing)
22 return external_diff_cmd;
23
86436c28
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24 /*
25 * Default values above are meant to match the
26 * Linux kernel development style. Examples of
27 * alternative styles you can specify via environment
28 * variables are:
29 *
86436c28
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30 * GIT_DIFF_OPTS="-c";
31 */
d19938ab
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32 if (gitenv("GIT_EXTERNAL_DIFF"))
33 external_diff_cmd = gitenv("GIT_EXTERNAL_DIFF");
be3cfa85
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34
35 /* In case external diff fails... */
d19938ab 36 diff_opts = gitenv("GIT_DIFF_OPTS") ? : diff_opts;
be3cfa85
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37
38 done_preparing = 1;
39 return external_diff_cmd;
86436c28
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40}
41
42/* Help to copy the thing properly quoted for the shell safety.
43 * any single quote is replaced with '\'', and the caller is
44 * expected to enclose the result within a single quote pair.
45 *
46 * E.g.
47 * original sq_expand result
48 * name ==> name ==> 'name'
49 * a b ==> a b ==> 'a b'
50 * a'b ==> a'\''b ==> 'a'\''b'
51 */
52static char *sq_expand(const char *src)
53{
54 static char *buf = NULL;
55 int cnt, c;
56 const char *cp;
57 char *bp;
58
57fe64a4 59 /* count bytes needed to store the quoted string. */
86436c28
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60 for (cnt = 1, cp = src; *cp; cnt++, cp++)
61 if (*cp == '\'')
62 cnt += 3;
63
812666c8 64 buf = xmalloc(cnt);
86436c28
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65 bp = buf;
66 while ((c = *src++)) {
67 if (c != '\'')
68 *bp++ = c;
69 else {
70 bp = strcpy(bp, "'\\''");
71 bp += 4;
72 }
73 }
74 *bp = 0;
75 return buf;
76}
77
be3cfa85 78static struct diff_tempfile {
427dcb4b 79 const char *name; /* filename external diff should read from */
be3cfa85
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80 char hex[41];
81 char mode[10];
82 char tmp_path[50];
83} diff_temp[2];
84
915838c3
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85static void builtin_diff(const char *name_a,
86 const char *name_b,
57fe64a4 87 struct diff_tempfile *temp,
427dcb4b 88 const char *xfrm_msg)
86436c28 89{
9669e17a 90 int i, next_at, cmd_size;
c983370e 91 const char *diff_cmd = "diff -L'%s%s' -L'%s%s'";
6fa28064 92 const char *diff_arg = "'%s' '%s'||:"; /* "||:" is to return 0 */
2f978138
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93 const char *input_name_sq[2];
94 const char *path0[2];
95 const char *path1[2];
915838c3 96 const char *name_sq[2];
2f978138 97 char *cmd;
915838c3
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98
99 name_sq[0] = sq_expand(name_a);
100 name_sq[1] = sq_expand(name_b);
101
c983370e
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102 /* diff_cmd and diff_arg have 6 %s in total which makes
103 * the sum of these strings 12 bytes larger than required.
be3cfa85 104 * we use 2 spaces around diff-opts, and we need to count
c983370e 105 * terminating NUL, so we subtract 9 here.
be3cfa85 106 */
9669e17a 107 cmd_size = (strlen(diff_cmd) + strlen(diff_opts) +
c983370e 108 strlen(diff_arg) - 9);
2f978138
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109 for (i = 0; i < 2; i++) {
110 input_name_sq[i] = sq_expand(temp[i].name);
111 if (!strcmp(temp[i].name, "/dev/null")) {
112 path0[i] = "/dev/null";
113 path1[i] = "";
2f978138 114 } else {
0980d9b3 115 path0[i] = i ? "b/" : "a/";
915838c3 116 path1[i] = name_sq[i];
2f978138
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117 }
118 cmd_size += (strlen(path0[i]) + strlen(path1[i]) +
c983370e 119 strlen(input_name_sq[i]));
2f978138 120 }
be3cfa85 121
2f978138
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122 cmd = xmalloc(cmd_size);
123
124 next_at = 0;
be3cfa85 125 next_at += snprintf(cmd+next_at, cmd_size-next_at,
2f978138 126 diff_cmd,
c983370e 127 path0[0], path1[0], path0[1], path1[1]);
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128 next_at += snprintf(cmd+next_at, cmd_size-next_at,
129 " %s ", diff_opts);
130 next_at += snprintf(cmd+next_at, cmd_size-next_at,
2f978138
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131 diff_arg, input_name_sq[0], input_name_sq[1]);
132
915838c3 133 printf("diff --git a/%s b/%s\n", name_a, name_b);
c983370e 134 if (!path1[0][0])
b58f23b3 135 printf("new file mode %s\n", temp[1].mode);
c983370e 136 else if (!path1[1][0])
b58f23b3 137 printf("deleted file mode %s\n", temp[0].mode);
273b9834 138 else {
b58f23b3
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139 if (strcmp(temp[0].mode, temp[1].mode)) {
140 printf("old mode %s\n", temp[0].mode);
141 printf("new mode %s\n", temp[1].mode);
142 }
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143 if (xfrm_msg && xfrm_msg[0])
144 fputs(xfrm_msg, stdout);
145
273b9834
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146 if (strncmp(temp[0].mode, temp[1].mode, 3))
147 /* we do not run diff between different kind
148 * of objects.
149 */
b28858bf
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150 exit(0);
151 }
c983370e 152 fflush(NULL);
be3cfa85 153 execlp("/bin/sh","sh", "-c", cmd, NULL);
86436c28
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154}
155
427dcb4b
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156struct diff_filespec *alloc_filespec(const char *path)
157{
158 int namelen = strlen(path);
159 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
160 spec->path = (char *)(spec + 1);
161 strcpy(spec->path, path);
81e50eab 162 spec->should_free = spec->should_munmap = 0;
427dcb4b
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163 spec->xfrm_flags = 0;
164 spec->size = 0;
09d74b3b 165 spec->data = NULL;
81e50eab
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166 spec->mode = 0;
167 memset(spec->sha1, 0, 20);
427dcb4b
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168 return spec;
169}
170
171void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
172 unsigned short mode)
173{
81e50eab
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174 if (mode) { /* just playing defensive */
175 spec->mode = mode;
176 memcpy(spec->sha1, sha1, 20);
177 spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
178 }
427dcb4b
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179}
180
b46f0b6d
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181/*
182 * Given a name and sha1 pair, if the dircache tells us the file in
183 * the work tree has that object contents, return true, so that
184 * prepare_temp_file() does not have to inflate and extract.
185 */
186static int work_tree_matches(const char *name, const unsigned char *sha1)
187{
188 struct cache_entry *ce;
189 struct stat st;
190 int pos, len;
5c97558c 191
b46f0b6d
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192 /* We do not read the cache ourselves here, because the
193 * benchmark with my previous version that always reads cache
194 * shows that it makes things worse for diff-tree comparing
195 * two linux-2.6 kernel trees in an already checked out work
915838c3 196 * tree. This is because most diff-tree comparisons deal with
b46f0b6d
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197 * only a small number of files, while reading the cache is
198 * expensive for a large project, and its cost outweighs the
199 * savings we get by not inflating the object to a temporary
200 * file. Practically, this code only helps when we are used
201 * by diff-cache --cached, which does read the cache before
202 * calling us.
57fe64a4 203 */
b46f0b6d
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204 if (!active_cache)
205 return 0;
206
207 len = strlen(name);
208 pos = cache_name_pos(name, len);
209 if (pos < 0)
210 return 0;
211 ce = active_cache[pos];
b28858bf 212 if ((lstat(name, &st) < 0) ||
427dcb4b 213 !S_ISREG(st.st_mode) || /* careful! */
5d728c84 214 ce_match_stat(ce, &st) ||
b46f0b6d
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215 memcmp(sha1, ce->sha1, 20))
216 return 0;
427dcb4b
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217 /* we return 1 only when we can stat, it is a regular file,
218 * stat information matches, and sha1 recorded in the cache
219 * matches. I.e. we know the file in the work tree really is
220 * the same as the <name, sha1> pair.
221 */
b46f0b6d
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222 return 1;
223}
224
427dcb4b
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225/*
226 * While doing rename detection and pickaxe operation, we may need to
227 * grab the data for the blob (or file) for our own in-core comparison.
228 * diff_filespec has data and size fields for this purpose.
229 */
230int diff_populate_filespec(struct diff_filespec *s)
231{
232 int err = 0;
81e50eab 233 if (!DIFF_FILE_VALID(s))
427dcb4b
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234 die("internal error: asking to populate invalid file.");
235 if (S_ISDIR(s->mode))
236 return -1;
237
238 if (s->data)
239 return err;
240 if (!s->sha1_valid ||
241 work_tree_matches(s->path, s->sha1)) {
242 struct stat st;
243 int fd;
244 if (lstat(s->path, &st) < 0) {
245 if (errno == ENOENT) {
246 err_empty:
247 err = -1;
248 empty:
249 s->data = "";
250 s->size = 0;
251 return err;
252 }
253 }
254 s->size = st.st_size;
255 if (!s->size)
256 goto empty;
257 if (S_ISLNK(st.st_mode)) {
258 int ret;
259 s->data = xmalloc(s->size);
260 s->should_free = 1;
261 ret = readlink(s->path, s->data, s->size);
262 if (ret < 0) {
263 free(s->data);
264 goto err_empty;
265 }
266 return 0;
267 }
268 fd = open(s->path, O_RDONLY);
269 if (fd < 0)
270 goto err_empty;
271 s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
272 s->should_munmap = 1;
273 close(fd);
274 }
275 else {
276 char type[20];
277 s->data = read_sha1_file(s->sha1, type, &s->size);
278 s->should_free = 1;
279 }
280 return 0;
281}
282
283void diff_free_filespec_data(struct diff_filespec *s)
284{
285 if (s->should_free)
286 free(s->data);
287 else if (s->should_munmap)
288 munmap(s->data, s->size);
289 s->should_free = s->should_munmap = 0;
09d74b3b 290 s->data = NULL;
427dcb4b
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291}
292
b28858bf
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293static void prep_temp_blob(struct diff_tempfile *temp,
294 void *blob,
295 unsigned long size,
296 unsigned char *sha1,
297 int mode)
298{
299 int fd;
300
301 strcpy(temp->tmp_path, ".diff_XXXXXX");
302 fd = mkstemp(temp->tmp_path);
303 if (fd < 0)
304 die("unable to create temp-file");
305 if (write(fd, blob, size) != size)
306 die("unable to write temp-file");
307 close(fd);
308 temp->name = temp->tmp_path;
309 strcpy(temp->hex, sha1_to_hex(sha1));
310 temp->hex[40] = 0;
311 sprintf(temp->mode, "%06o", mode);
312}
313
be3cfa85
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314static void prepare_temp_file(const char *name,
315 struct diff_tempfile *temp,
427dcb4b 316 struct diff_filespec *one)
86436c28 317{
81e50eab 318 if (!DIFF_FILE_VALID(one)) {
be3cfa85 319 not_a_valid_file:
532149d7
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320 /* A '-' entry produces this for file-2, and
321 * a '+' entry produces this for file-1.
322 */
be3cfa85
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323 temp->name = "/dev/null";
324 strcpy(temp->hex, ".");
325 strcpy(temp->mode, ".");
86436c28
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326 return;
327 }
be3cfa85 328
5c97558c 329 if (!one->sha1_valid ||
427dcb4b 330 work_tree_matches(name, one->sha1)) {
be3cfa85 331 struct stat st;
427dcb4b 332 if (lstat(name, &st) < 0) {
be3cfa85
JH
333 if (errno == ENOENT)
334 goto not_a_valid_file;
427dcb4b 335 die("stat(%s): %s", name, strerror(errno));
be3cfa85 336 }
b28858bf
JH
337 if (S_ISLNK(st.st_mode)) {
338 int ret;
339 char *buf, buf_[1024];
340 buf = ((sizeof(buf_) < st.st_size) ?
341 xmalloc(st.st_size) : buf_);
342 ret = readlink(name, buf, st.st_size);
343 if (ret < 0)
344 die("readlink(%s)", name);
345 prep_temp_blob(temp, buf, st.st_size,
346 (one->sha1_valid ?
427dcb4b 347 one->sha1 : null_sha1),
b28858bf
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348 (one->sha1_valid ?
349 one->mode : S_IFLNK));
350 }
351 else {
427dcb4b
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352 /* we can borrow from the file in the work tree */
353 temp->name = name;
b28858bf
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354 if (!one->sha1_valid)
355 strcpy(temp->hex, sha1_to_hex(null_sha1));
356 else
427dcb4b 357 strcpy(temp->hex, sha1_to_hex(one->sha1));
b28858bf
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358 sprintf(temp->mode, "%06o",
359 S_IFREG |ce_permissions(st.st_mode));
360 }
361 return;
be3cfa85
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362 }
363 else {
427dcb4b
JH
364 if (diff_populate_filespec(one))
365 die("cannot read data blob for %s", one->path);
366 prep_temp_blob(temp, one->data, one->size,
367 one->sha1, one->mode);
be3cfa85
JH
368 }
369}
370
371static void remove_tempfile(void)
372{
373 int i;
374
375 for (i = 0; i < 2; i++)
376 if (diff_temp[i].name == diff_temp[i].tmp_path) {
377 unlink(diff_temp[i].name);
378 diff_temp[i].name = NULL;
379 }
380}
381
532149d7
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382static void remove_tempfile_on_signal(int signo)
383{
384 remove_tempfile();
385}
386
be3cfa85
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387/* An external diff command takes:
388 *
389 * diff-cmd name infile1 infile1-sha1 infile1-mode \
5c97558c 390 * infile2 infile2-sha1 infile2-mode [ rename-to ]
be3cfa85
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391 *
392 */
5c97558c
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393static void run_external_diff(const char *name,
394 const char *other,
427dcb4b
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395 struct diff_filespec *one,
396 struct diff_filespec *two,
397 const char *xfrm_msg)
be3cfa85
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398{
399 struct diff_tempfile *temp = diff_temp;
532149d7
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400 pid_t pid;
401 int status;
be3cfa85
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402 static int atexit_asked = 0;
403
77eb2720
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404 if (one && two) {
405 prepare_temp_file(name, &temp[0], one);
915838c3 406 prepare_temp_file(other ? : name, &temp[1], two);
77eb2720
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407 if (! atexit_asked &&
408 (temp[0].name == temp[0].tmp_path ||
409 temp[1].name == temp[1].tmp_path)) {
410 atexit_asked = 1;
411 atexit(remove_tempfile);
412 }
532149d7 413 signal(SIGINT, remove_tempfile_on_signal);
be3cfa85
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414 }
415
416 fflush(NULL);
417 pid = fork();
418 if (pid < 0)
419 die("unable to fork");
420 if (!pid) {
421 const char *pgm = external_diff();
5c97558c
JH
422 if (pgm) {
423 if (one && two) {
427dcb4b 424 const char *exec_arg[10];
5c97558c
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425 const char **arg = &exec_arg[0];
426 *arg++ = pgm;
427 *arg++ = name;
428 *arg++ = temp[0].name;
429 *arg++ = temp[0].hex;
430 *arg++ = temp[0].mode;
431 *arg++ = temp[1].name;
432 *arg++ = temp[1].hex;
433 *arg++ = temp[1].mode;
427dcb4b 434 if (other) {
5c97558c 435 *arg++ = other;
427dcb4b
JH
436 *arg++ = xfrm_msg;
437 }
09d74b3b 438 *arg = NULL;
5c97558c
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439 execvp(pgm, (char *const*) exec_arg);
440 }
77eb2720
JH
441 else
442 execlp(pgm, pgm, name, NULL);
443 }
be3cfa85
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444 /*
445 * otherwise we use the built-in one.
446 */
77eb2720 447 if (one && two)
427dcb4b 448 builtin_diff(name, other ? : name, temp, xfrm_msg);
77eb2720
JH
449 else
450 printf("* Unmerged path %s\n", name);
be3cfa85
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451 exit(0);
452 }
6fa28064
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453 if (waitpid(pid, &status, 0) < 0 ||
454 !WIFEXITED(status) || WEXITSTATUS(status)) {
455 /* Earlier we did not check the exit status because
532149d7 456 * diff exits non-zero if files are different, and
6fa28064
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457 * we are not interested in knowing that. It was a
458 * mistake which made it harder to quit a diff-*
459 * session that uses the git-apply-patch-script as
460 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
461 * should also exit non-zero only when it wants to
462 * abort the entire diff-* session.
532149d7
JH
463 */
464 remove_tempfile();
6fa28064
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465 fprintf(stderr, "external diff died, stopping at %s.\n", name);
466 exit(1);
532149d7 467 }
be3cfa85
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468 remove_tempfile();
469}
470
6b14d7fa 471void diff_setup(int reverse_diff_)
5c97558c 472{
6b14d7fa 473 reverse_diff = reverse_diff_;
5c97558c
JH
474}
475
6b14d7fa
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476struct diff_queue_struct diff_queued_diff;
477
478void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
5c97558c 479{
6b14d7fa
JH
480 if (queue->alloc <= queue->nr) {
481 queue->alloc = alloc_nr(queue->alloc);
482 queue->queue = xrealloc(queue->queue,
483 sizeof(dp) * queue->alloc);
81e50eab 484 }
6b14d7fa 485 queue->queue[queue->nr++] = dp;
5c97558c
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486}
487
52e95789 488struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
6b14d7fa
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489 struct diff_filespec *one,
490 struct diff_filespec *two)
5c97558c 491{
52e95789 492 struct diff_filepair *dp = xmalloc(sizeof(*dp));
427dcb4b
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493 dp->one = one;
494 dp->two = two;
f7c1512a 495 dp->score = 0;
6b14d7fa 496 diff_q(queue, dp);
427dcb4b 497 return dp;
5c97558c
JH
498}
499
bceafe75
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500static void diff_flush_raw(struct diff_filepair *p,
501 int line_termination,
502 int inter_name_termination)
5c97558c 503{
b6d8f309
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504 int two_paths;
505 char status[10];
25d5ea41
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506
507 if (line_termination) {
508 const char *err = "path %s cannot be expressed without -z";
509 if (strchr(p->one->path, line_termination) ||
510 strchr(p->one->path, inter_name_termination))
511 die(err, p->one->path);
512 if (strchr(p->two->path, line_termination) ||
513 strchr(p->two->path, inter_name_termination))
514 die(err, p->two->path);
515 }
516
b6d8f309
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517 switch (p->status) {
518 case 'C': case 'R':
519 two_paths = 1;
520 sprintf(status, "%c%1d", p->status, p->score);
521 break;
522 default:
523 two_paths = 0;
524 status[0] = p->status;
525 status[1] = 0;
526 break;
6b14d7fa 527 }
81e50eab
JH
528 printf(":%06o %06o %s ",
529 p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
b6d8f309
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530 printf("%s %s%c%s",
531 sha1_to_hex(p->two->sha1),
532 status,
533 inter_name_termination,
534 p->one->path);
535 if (two_paths)
536 printf("%c%s", inter_name_termination, p->two->path);
537 putchar(line_termination);
5c97558c
JH
538}
539
f7c1512a 540int diff_unmodified_pair(struct diff_filepair *p)
5c97558c 541{
427dcb4b
JH
542 /* This function is written stricter than necessary to support
543 * the currently implemented transformers, but the idea is to
52e95789 544 * let transformers to produce diff_filepairs any way they want,
427dcb4b 545 * and filter and clean them up here before producing the output.
5c97558c 546 */
6b14d7fa
JH
547 struct diff_filespec *one, *two;
548
549 if (DIFF_PAIR_UNMERGED(p))
550 return 0; /* unmerged is interesting */
5c97558c 551
6b14d7fa
JH
552 one = p->one;
553 two = p->two;
5c97558c 554
427dcb4b 555 /* deletion, addition, mode change and renames are all interesting. */
81e50eab
JH
556 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
557 (one->mode != two->mode) ||
427dcb4b
JH
558 strcmp(one->path, two->path))
559 return 0;
57fe64a4 560
427dcb4b
JH
561 /* both are valid and point at the same path. that is, we are
562 * dealing with a change.
57fe64a4 563 */
427dcb4b
JH
564 if (one->sha1_valid && two->sha1_valid &&
565 !memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
566 return 1; /* no change */
567 if (!one->sha1_valid && !two->sha1_valid)
568 return 1; /* both look at the same file on the filesystem. */
569 return 0;
57fe64a4
JH
570}
571
b6d8f309 572static void diff_flush_patch(struct diff_filepair *p)
f7c1512a
JH
573{
574 const char *name, *other;
b6d8f309 575 char msg_[PATH_MAX*2+200], *msg;
f7c1512a 576
f7c1512a
JH
577 if (diff_unmodified_pair(p))
578 return;
579
580 name = p->one->path;
581 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
582 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
583 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
584 return; /* no tree diffs in patch format */
585
b6d8f309
JH
586 switch (p->status) {
587 case 'C':
588 sprintf(msg_,
589 "similarity index %d%%\n"
590 "copy from %s\n"
591 "copy to %s\n",
bceafe75 592 (int)(0.5 + p->score * 100.0/MAX_SCORE),
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593 p->one->path, p->two->path);
594 msg = msg_;
595 break;
596 case 'R':
597 sprintf(msg_,
598 "similarity index %d%%\n"
599 "rename old %s\n"
600 "rename new %s\n",
bceafe75 601 (int)(0.5 + p->score * 100.0/MAX_SCORE),
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602 p->one->path, p->two->path);
603 msg = msg_;
604 break;
605 default:
606 msg = NULL;
607 }
608
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609 if (DIFF_PAIR_UNMERGED(p))
610 run_external_diff(name, NULL, NULL, NULL, NULL);
611 else
612 run_external_diff(name, other, p->one, p->two, msg);
613}
614
615int diff_needs_to_stay(struct diff_queue_struct *q, int i,
616 struct diff_filespec *it)
617{
618 /* If it will be used in later entry (either stay or used
619 * as the source of rename/copy), we need to copy, not rename.
620 */
621 while (i < q->nr) {
622 struct diff_filepair *p = q->queue[i++];
623 if (!DIFF_FILE_VALID(p->two))
624 continue; /* removed is fine */
625 if (strcmp(p->one->path, it->path))
626 continue; /* not relevant */
627
628 /* p has its src set to *it and it is not a delete;
629 * it will be used for in-place change, rename/copy,
630 * or just stays there. We cannot rename it out.
631 */
632 return 1;
633 }
634 return 0;
635}
636
bceafe75 637int diff_queue_is_empty(void)
f7c1512a 638{
bceafe75 639 struct diff_queue_struct *q = &diff_queued_diff;
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640 int i;
641 for (i = 0; i < q->nr; i++)
642 if (!diff_unmodified_pair(q->queue[i]))
643 return 0;
644 return 1;
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645}
646
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647#if DIFF_DEBUG
648void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
649{
650 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
651 x, one ? : "",
652 s->path,
653 DIFF_FILE_VALID(s) ? "valid" : "invalid",
654 s->mode,
655 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
656 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
657 x, one ? : "",
658 s->size, s->xfrm_flags);
659}
660
661void diff_debug_filepair(const struct diff_filepair *p, int i)
662{
663 diff_debug_filespec(p->one, i, "one");
664 diff_debug_filespec(p->two, i, "two");
665 fprintf(stderr, "score %d, status %c\n",
666 p->score, p->status ? : '?');
667}
668
669void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
6b14d7fa 670{
6b14d7fa 671 int i;
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672 if (msg)
673 fprintf(stderr, "%s\n", msg);
674 fprintf(stderr, "q->nr = %d\n", q->nr);
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675 for (i = 0; i < q->nr; i++) {
676 struct diff_filepair *p = q->queue[i];
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677 diff_debug_filepair(p, i);
678 }
679}
680#endif
681
682static void diff_resolve_rename_copy(void)
683{
684 int i, j;
685 struct diff_filepair *p, *pp;
686 struct diff_queue_struct *q = &diff_queued_diff;
687
688 /* This should not depend on the ordering of things. */
689
690 diff_debug_queue("resolve-rename-copy", q);
691
692 for (i = 0; i < q->nr; i++) {
693 p = q->queue[i];
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694 p->status = 0;
695 if (DIFF_PAIR_UNMERGED(p))
696 p->status = 'U';
697 else if (!DIFF_FILE_VALID((p)->one))
698 p->status = 'N';
699 else if (!DIFF_FILE_VALID((p)->two)) {
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700 /* Deletion record should be omitted if there
701 * is another entry that is a rename or a copy
702 * and it uses this one as the source. Then we
703 * can say the other one is a rename.
bceafe75 704 */
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705 for (j = 0; j < q->nr; j++) {
706 pp = q->queue[j];
707 if (!strcmp(pp->one->path, p->one->path) &&
708 strcmp(pp->one->path, pp->two->path))
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709 break;
710 }
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711 if (j < q->nr)
712 continue; /* has rename/copy */
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713 p->status = 'D';
714 }
715 else if (strcmp(p->one->path, p->two->path)) {
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716 /* See if there is somebody else anywhere that
717 * will keep the path (either modified or
718 * unmodified). If so, we have to be a copy,
719 * not a rename. In addition, if there is
720 * some other rename or copy that comes later
721 * than us that uses the same source, we
722 * cannot be a rename either.
723 */
724 for (j = 0; j < q->nr; j++) {
725 pp = q->queue[j];
726 if (strcmp(pp->one->path, p->one->path))
727 continue;
728 if (!strcmp(pp->one->path, pp->two->path)) {
729 if (DIFF_FILE_VALID(pp->two)) {
730 /* non-delete */
731 p->status = 'C';
732 break;
733 }
734 continue;
735 }
736 /* pp is a rename/copy ... */
737 if (i < j) {
738 /* ... and comes later than us */
739 p->status = 'C';
740 break;
741 }
742 }
743 if (!p->status)
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744 p->status = 'R';
745 }
746 else if (memcmp(p->one->sha1, p->two->sha1, 20))
747 p->status = 'M';
748 else {
749 /* we do not need this one */
750 p->status = 0;
751 }
6b14d7fa 752 }
25d5ea41 753 diff_debug_queue("resolve-rename-copy done", q);
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754}
755
b6d8f309 756void diff_flush(int diff_output_style, int resolve_rename_copy)
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757{
758 struct diff_queue_struct *q = &diff_queued_diff;
759 int i;
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760 int line_termination = '\n';
761 int inter_name_termination = '\t';
38c6f780 762
bceafe75 763 if (diff_output_style == DIFF_FORMAT_MACHINE)
6b14d7fa 764 line_termination = inter_name_termination = 0;
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765 if (resolve_rename_copy)
766 diff_resolve_rename_copy();
767
f7c1512a 768 for (i = 0; i < q->nr; i++) {
f7c1512a 769 struct diff_filepair *p = q->queue[i];
bceafe75 770 if (p->status == 0)
6f93a631 771 p->status = '?';
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772 switch (diff_output_style) {
773 case DIFF_FORMAT_PATCH:
b6d8f309 774 diff_flush_patch(p);
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775 break;
776 case DIFF_FORMAT_HUMAN:
777 case DIFF_FORMAT_MACHINE:
778 diff_flush_raw(p, line_termination,
779 inter_name_termination);
780 break;
781 }
f7c1512a 782 }
427dcb4b 783 for (i = 0; i < q->nr; i++) {
52e95789 784 struct diff_filepair *p = q->queue[i];
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785 diff_free_filespec_data(p->one);
786 diff_free_filespec_data(p->two);
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787 free(p);
788 }
789 free(q->queue);
790 q->queue = NULL;
791 q->nr = q->alloc = 0;
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792}
793
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794void diff_addremove(int addremove, unsigned mode,
795 const unsigned char *sha1,
796 const char *base, const char *path)
be3cfa85 797{
77eb2720 798 char concatpath[PATH_MAX];
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799 struct diff_filespec *one, *two;
800
801 /* This may look odd, but it is a preparation for
802 * feeding "there are unchanged files which should
803 * not produce diffs, but when you are doing copy
804 * detection you would need them, so here they are"
805 * entries to the diff-core. They will be prefixed
806 * with something like '=' or '*' (I haven't decided
807 * which but should not make any difference).
f7c1512a 808 * Feeding the same new and old to diff_change()
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809 * also has the same effect.
810 * Before the final output happens, they are pruned after
811 * merged into rename/copy pairs as appropriate.
427dcb4b 812 */
7ca45252 813 if (reverse_diff)
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814 addremove = (addremove == '+' ? '-' :
815 addremove == '-' ? '+' : addremove);
7ca45252 816
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817 if (!path) path = "";
818 sprintf(concatpath, "%s%s", base, path);
819 one = alloc_filespec(concatpath);
820 two = alloc_filespec(concatpath);
be3cfa85 821
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822 if (addremove != '+')
823 fill_filespec(one, sha1, mode);
824 if (addremove != '-')
825 fill_filespec(two, sha1, mode);
5c97558c 826
38c6f780 827 diff_queue(&diff_queued_diff, one, two);
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828}
829
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830void diff_helper_input(unsigned old_mode,
831 unsigned new_mode,
832 const unsigned char *old_sha1,
833 const unsigned char *new_sha1,
834 const char *old_path,
835 int status,
836 int score,
837 const char *new_path)
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838{
839 struct diff_filespec *one, *two;
b6d8f309 840 struct diff_filepair *dp;
81e50eab 841
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842 one = alloc_filespec(old_path);
843 two = alloc_filespec(new_path);
844 if (old_mode)
845 fill_filespec(one, old_sha1, old_mode);
846 if (new_mode)
847 fill_filespec(two, new_sha1, new_mode);
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848 dp = diff_queue(&diff_queued_diff, one, two);
849 dp->score = score;
850 dp->status = status;
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851}
852
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853void diff_change(unsigned old_mode, unsigned new_mode,
854 const unsigned char *old_sha1,
855 const unsigned char *new_sha1,
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856 const char *base, const char *path)
857{
77eb2720 858 char concatpath[PATH_MAX];
427dcb4b 859 struct diff_filespec *one, *two;
77eb2720 860
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861 if (reverse_diff) {
862 unsigned tmp;
863 const unsigned char *tmp_c;
864 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
865 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
866 }
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867 if (!path) path = "";
868 sprintf(concatpath, "%s%s", base, path);
869 one = alloc_filespec(concatpath);
870 two = alloc_filespec(concatpath);
871 fill_filespec(one, old_sha1, old_mode);
872 fill_filespec(two, new_sha1, new_mode);
873
38c6f780 874 diff_queue(&diff_queued_diff, one, two);
77eb2720 875}
be3cfa85 876
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877void diff_unmerge(const char *path)
878{
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879 struct diff_filespec *one, *two;
880 one = alloc_filespec(path);
881 two = alloc_filespec(path);
882 diff_queue(&diff_queued_diff, one, two);
86436c28 883}