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Commit | Line | Data |
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65056021 JH |
1 | /* |
2 | * Builtin "git diff" | |
3 | * | |
4 | * Copyright (c) 2006 Junio C Hamano | |
5 | */ | |
6 | #include "cache.h" | |
6b2f2d98 | 7 | #include "color.h" |
65056021 JH |
8 | #include "commit.h" |
9 | #include "blob.h" | |
10 | #include "tag.h" | |
11 | #include "diff.h" | |
12 | #include "diffcore.h" | |
13 | #include "revision.h" | |
14 | #include "log-tree.h" | |
15 | #include "builtin.h" | |
16 | ||
65056021 JH |
17 | struct blobinfo { |
18 | unsigned char sha1[20]; | |
19 | const char *name; | |
01618a3a | 20 | unsigned mode; |
65056021 JH |
21 | }; |
22 | ||
23 | static const char builtin_diff_usage[] = | |
1b1dd23f | 24 | "git diff <options> <rev>{0,2} -- <path>*"; |
65056021 | 25 | |
65056021 JH |
26 | static void stuff_change(struct diff_options *opt, |
27 | unsigned old_mode, unsigned new_mode, | |
28 | const unsigned char *old_sha1, | |
29 | const unsigned char *new_sha1, | |
30 | const char *old_name, | |
31 | const char *new_name) | |
32 | { | |
33 | struct diff_filespec *one, *two; | |
34 | ||
0bef57ee | 35 | if (!is_null_sha1(old_sha1) && !is_null_sha1(new_sha1) && |
43342941 | 36 | !hashcmp(old_sha1, new_sha1) && (old_mode == new_mode)) |
65056021 JH |
37 | return; |
38 | ||
8f67f8ae | 39 | if (DIFF_OPT_TST(opt, REVERSE_DIFF)) { |
65056021 | 40 | unsigned tmp; |
d92f1dc6 | 41 | const unsigned char *tmp_u; |
65056021 JH |
42 | const char *tmp_c; |
43 | tmp = old_mode; old_mode = new_mode; new_mode = tmp; | |
44 | tmp_u = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_u; | |
45 | tmp_c = old_name; old_name = new_name; new_name = tmp_c; | |
46 | } | |
cd676a51 JH |
47 | |
48 | if (opt->prefix && | |
49 | (strncmp(old_name, opt->prefix, opt->prefix_length) || | |
50 | strncmp(new_name, opt->prefix, opt->prefix_length))) | |
51 | return; | |
52 | ||
65056021 JH |
53 | one = alloc_filespec(old_name); |
54 | two = alloc_filespec(new_name); | |
55 | fill_filespec(one, old_sha1, old_mode); | |
56 | fill_filespec(two, new_sha1, new_mode); | |
57 | ||
65056021 JH |
58 | diff_queue(&diff_queued_diff, one, two); |
59 | } | |
60 | ||
61 | static int builtin_diff_b_f(struct rev_info *revs, | |
62 | int argc, const char **argv, | |
63 | struct blobinfo *blob, | |
64 | const char *path) | |
65 | { | |
66 | /* Blob vs file in the working tree*/ | |
67 | struct stat st; | |
68 | ||
a610786f TH |
69 | if (argc > 1) |
70 | usage(builtin_diff_usage); | |
71 | ||
65056021 JH |
72 | if (lstat(path, &st)) |
73 | die("'%s': %s", path, strerror(errno)); | |
74 | if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) | |
75 | die("'%s': not a regular file or symlink", path); | |
01618a3a MK |
76 | |
77 | if (blob[0].mode == S_IFINVALID) | |
78 | blob[0].mode = canon_mode(st.st_mode); | |
79 | ||
65056021 | 80 | stuff_change(&revs->diffopt, |
01618a3a | 81 | blob[0].mode, canon_mode(st.st_mode), |
65056021 | 82 | blob[0].sha1, null_sha1, |
065e0b12 | 83 | path, path); |
65056021 JH |
84 | diffcore_std(&revs->diffopt); |
85 | diff_flush(&revs->diffopt); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static int builtin_diff_blobs(struct rev_info *revs, | |
90 | int argc, const char **argv, | |
91 | struct blobinfo *blob) | |
92 | { | |
65056021 JH |
93 | unsigned mode = canon_mode(S_IFREG | 0644); |
94 | ||
a610786f TH |
95 | if (argc > 1) |
96 | usage(builtin_diff_usage); | |
97 | ||
01618a3a MK |
98 | if (blob[0].mode == S_IFINVALID) |
99 | blob[0].mode = mode; | |
100 | ||
101 | if (blob[1].mode == S_IFINVALID) | |
102 | blob[1].mode = mode; | |
103 | ||
65056021 | 104 | stuff_change(&revs->diffopt, |
01618a3a | 105 | blob[0].mode, blob[1].mode, |
f82cd3c6 | 106 | blob[0].sha1, blob[1].sha1, |
53dd8a9c | 107 | blob[0].name, blob[1].name); |
65056021 JH |
108 | diffcore_std(&revs->diffopt); |
109 | diff_flush(&revs->diffopt); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int builtin_diff_index(struct rev_info *revs, | |
114 | int argc, const char **argv) | |
115 | { | |
116 | int cached = 0; | |
117 | while (1 < argc) { | |
118 | const char *arg = argv[1]; | |
f2dd1c9a | 119 | if (!strcmp(arg, "--cached")) |
65056021 | 120 | cached = 1; |
65056021 JH |
121 | else |
122 | usage(builtin_diff_usage); | |
123 | argv++; argc--; | |
124 | } | |
4f38f6b5 NTND |
125 | if (!cached) |
126 | setup_work_tree(); | |
65056021 JH |
127 | /* |
128 | * Make sure there is one revision (i.e. pending object), | |
129 | * and there is no revision filtering parameters. | |
130 | */ | |
1f1e895f | 131 | if (revs->pending.nr != 1 || |
65056021 JH |
132 | revs->max_count != -1 || revs->min_age != -1 || |
133 | revs->max_age != -1) | |
134 | usage(builtin_diff_usage); | |
b4e1e4a7 JH |
135 | if (read_cache() < 0) { |
136 | perror("read_cache"); | |
137 | return -1; | |
138 | } | |
65056021 JH |
139 | return run_diff_index(revs, cached); |
140 | } | |
141 | ||
142 | static int builtin_diff_tree(struct rev_info *revs, | |
143 | int argc, const char **argv, | |
1f1e895f | 144 | struct object_array_entry *ent) |
65056021 | 145 | { |
65056021 | 146 | const unsigned char *(sha1[2]); |
1f1e895f | 147 | int swap = 0; |
a610786f TH |
148 | |
149 | if (argc > 1) | |
150 | usage(builtin_diff_usage); | |
0fe7c1de JH |
151 | |
152 | /* We saw two trees, ent[0] and ent[1]. | |
82e5a82f | 153 | * if ent[1] is uninteresting, they are swapped |
0fe7c1de | 154 | */ |
1f1e895f LT |
155 | if (ent[1].item->flags & UNINTERESTING) |
156 | swap = 1; | |
65056021 JH |
157 | sha1[swap] = ent[0].item->sha1; |
158 | sha1[1-swap] = ent[1].item->sha1; | |
159 | diff_tree_sha1(sha1[0], sha1[1], "", &revs->diffopt); | |
160 | log_tree_diff_flush(revs); | |
161 | return 0; | |
162 | } | |
163 | ||
0fe7c1de JH |
164 | static int builtin_diff_combined(struct rev_info *revs, |
165 | int argc, const char **argv, | |
1f1e895f | 166 | struct object_array_entry *ent, |
0fe7c1de JH |
167 | int ents) |
168 | { | |
169 | const unsigned char (*parent)[20]; | |
170 | int i; | |
171 | ||
a610786f TH |
172 | if (argc > 1) |
173 | usage(builtin_diff_usage); | |
174 | ||
0fe7c1de JH |
175 | if (!revs->dense_combined_merges && !revs->combine_merges) |
176 | revs->dense_combined_merges = revs->combine_merges = 1; | |
177 | parent = xmalloc(ents * sizeof(*parent)); | |
0fe7c1de | 178 | for (i = 0; i < ents; i++) |
dbc2fb6b | 179 | hashcpy((unsigned char *)(parent + i), ent[i].item->sha1); |
0fe7c1de JH |
180 | diff_tree_combined(parent[0], parent + 1, ents - 1, |
181 | revs->dense_combined_merges, revs); | |
182 | return 0; | |
183 | } | |
184 | ||
aecbf914 JH |
185 | static void refresh_index_quietly(void) |
186 | { | |
187 | struct lock_file *lock_file; | |
188 | int fd; | |
189 | ||
190 | lock_file = xcalloc(1, sizeof(struct lock_file)); | |
191 | fd = hold_locked_index(lock_file, 0); | |
192 | if (fd < 0) | |
193 | return; | |
194 | discard_cache(); | |
195 | read_cache(); | |
196 | refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED); | |
fbbdbfc3 JH |
197 | |
198 | if (active_cache_changed && | |
4ed7cd3a | 199 | !write_cache(fd, active_cache, active_nr)) |
fbbdbfc3 JH |
200 | commit_locked_index(lock_file); |
201 | ||
aecbf914 JH |
202 | rollback_lock_file(lock_file); |
203 | } | |
204 | ||
0569e9b8 JH |
205 | static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv) |
206 | { | |
207 | int result; | |
208 | unsigned int options = 0; | |
209 | ||
210 | while (1 < argc && argv[1][0] == '-') { | |
211 | if (!strcmp(argv[1], "--base")) | |
212 | revs->max_count = 1; | |
213 | else if (!strcmp(argv[1], "--ours")) | |
214 | revs->max_count = 2; | |
215 | else if (!strcmp(argv[1], "--theirs")) | |
216 | revs->max_count = 3; | |
217 | else if (!strcmp(argv[1], "-q")) | |
218 | options |= DIFF_SILENT_ON_REMOVED; | |
219 | else | |
220 | return error("invalid option: %s", argv[1]); | |
221 | argv++; argc--; | |
222 | } | |
223 | ||
903e09a3 JH |
224 | /* |
225 | * "diff --base" should not combine merges because it was not | |
226 | * asked to. "diff -c" should not densify (if the user wants | |
227 | * dense one, --cc can be explicitly asked for, or just rely | |
228 | * on the default). | |
229 | */ | |
230 | if (revs->max_count == -1 && !revs->combine_merges && | |
0569e9b8 JH |
231 | (revs->diffopt.output_format & DIFF_FORMAT_PATCH)) |
232 | revs->combine_merges = revs->dense_combined_merges = 1; | |
233 | ||
4f38f6b5 | 234 | setup_work_tree(); |
0569e9b8 JH |
235 | if (read_cache() < 0) { |
236 | perror("read_cache"); | |
237 | return -1; | |
238 | } | |
239 | result = run_diff_files(revs, options); | |
240 | return diff_result_code(&revs->diffopt, result); | |
241 | } | |
242 | ||
a633fca0 | 243 | int cmd_diff(int argc, const char **argv, const char *prefix) |
65056021 | 244 | { |
1f1e895f | 245 | int i; |
65056021 | 246 | struct rev_info rev; |
1f1e895f | 247 | struct object_array_entry ent[100]; |
65056021 | 248 | int ents = 0, blobs = 0, paths = 0; |
a633fca0 | 249 | const char *path = NULL; |
65056021 | 250 | struct blobinfo blob[2]; |
af05d679 | 251 | int nongit; |
41bbf9d5 | 252 | int result = 0; |
65056021 JH |
253 | |
254 | /* | |
255 | * We could get N tree-ish in the rev.pending_objects list. | |
256 | * Also there could be M blobs there, and P pathspecs. | |
257 | * | |
258 | * N=0, M=0: | |
259 | * cache vs files (diff-files) | |
260 | * N=0, M=2: | |
261 | * compare two random blobs. P must be zero. | |
262 | * N=0, M=1, P=1: | |
263 | * compare a blob with a working tree file. | |
264 | * | |
265 | * N=1, M=0: | |
266 | * tree vs cache (diff-index --cached) | |
267 | * | |
268 | * N=2, M=0: | |
269 | * tree vs tree (diff-tree) | |
270 | * | |
0569e9b8 JH |
271 | * N=0, M=0, P=2: |
272 | * compare two filesystem entities (aka --no-index). | |
273 | * | |
65056021 JH |
274 | * Other cases are errors. |
275 | */ | |
230f544e | 276 | |
d516c2d1 | 277 | prefix = setup_git_directory_gently(&nongit); |
ef90d6d4 | 278 | git_config(git_diff_ui_config, NULL); |
6b2f2d98 MK |
279 | |
280 | if (diff_use_color_default == -1) | |
281 | diff_use_color_default = git_use_color_default; | |
282 | ||
db6296a5 | 283 | init_revisions(&rev, prefix); |
0569e9b8 JH |
284 | |
285 | /* If this is a no-index diff, just run it and exit there. */ | |
286 | diff_no_index(&rev, argc, argv, nongit, prefix); | |
287 | ||
288 | /* Otherwise, we are doing the usual "git" diff */ | |
aecbf914 | 289 | rev.diffopt.skip_stat_unmatch = !!diff_auto_refresh_index; |
65056021 | 290 | |
61af494c JH |
291 | /* Default to let external be used */ |
292 | DIFF_OPT_SET(&rev.diffopt, ALLOW_EXTERNAL); | |
293 | ||
0569e9b8 JH |
294 | if (nongit) |
295 | die("Not a git repository"); | |
296 | argc = setup_revisions(argc, argv, &rev, NULL); | |
047fbe90 | 297 | if (!rev.diffopt.output_format) { |
c9b5ef99 | 298 | rev.diffopt.output_format = DIFF_FORMAT_PATCH; |
72ee96c0 JH |
299 | if (diff_setup_done(&rev.diffopt) < 0) |
300 | die("diff_setup_done failed"); | |
047fbe90 | 301 | } |
61af494c | 302 | |
8f67f8ae | 303 | DIFF_OPT_SET(&rev.diffopt, RECURSIVE); |
c9b5ef99 | 304 | |
da31b358 JH |
305 | /* |
306 | * If the user asked for our exit code then don't start a | |
89d07f75 RS |
307 | * pager or we would end up reporting its exit code instead. |
308 | */ | |
8f0359f0 AR |
309 | if (!DIFF_OPT_TST(&rev.diffopt, EXIT_WITH_STATUS) && |
310 | check_pager_config("diff") != 0) | |
89d07f75 RS |
311 | setup_pager(); |
312 | ||
0569e9b8 JH |
313 | /* |
314 | * Do we have --cached and not have a pending object, then | |
65056021 JH |
315 | * default to HEAD by hand. Eek. |
316 | */ | |
1f1e895f | 317 | if (!rev.pending.nr) { |
65056021 JH |
318 | int i; |
319 | for (i = 1; i < argc; i++) { | |
320 | const char *arg = argv[i]; | |
321 | if (!strcmp(arg, "--")) | |
322 | break; | |
323 | else if (!strcmp(arg, "--cached")) { | |
3384a2df | 324 | add_head_to_pending(&rev); |
6c09c451 JH |
325 | if (!rev.pending.nr) |
326 | die("No HEAD commit to compare with (yet)"); | |
65056021 JH |
327 | break; |
328 | } | |
329 | } | |
330 | } | |
331 | ||
1f1e895f LT |
332 | for (i = 0; i < rev.pending.nr; i++) { |
333 | struct object_array_entry *list = rev.pending.objects+i; | |
65056021 JH |
334 | struct object *obj = list->item; |
335 | const char *name = list->name; | |
336 | int flags = (obj->flags & UNINTERESTING); | |
337 | if (!obj->parsed) | |
338 | obj = parse_object(obj->sha1); | |
339 | obj = deref_tag(obj, NULL, 0); | |
340 | if (!obj) | |
341 | die("invalid object '%s' given.", name); | |
1974632c | 342 | if (obj->type == OBJ_COMMIT) |
65056021 | 343 | obj = &((struct commit *)obj)->tree->object; |
1974632c | 344 | if (obj->type == OBJ_TREE) { |
0fe7c1de JH |
345 | if (ARRAY_SIZE(ent) <= ents) |
346 | die("more than %d trees given: '%s'", | |
334b506a | 347 | (int) ARRAY_SIZE(ent), name); |
65056021 JH |
348 | obj->flags |= flags; |
349 | ent[ents].item = obj; | |
350 | ent[ents].name = name; | |
351 | ents++; | |
352 | continue; | |
353 | } | |
1974632c | 354 | if (obj->type == OBJ_BLOB) { |
65056021 JH |
355 | if (2 <= blobs) |
356 | die("more than two blobs given: '%s'", name); | |
e702496e | 357 | hashcpy(blob[blobs].sha1, obj->sha1); |
65056021 | 358 | blob[blobs].name = name; |
01618a3a | 359 | blob[blobs].mode = list->mode; |
65056021 JH |
360 | blobs++; |
361 | continue; | |
230f544e | 362 | |
65056021 JH |
363 | } |
364 | die("unhandled object '%s' given.", name); | |
365 | } | |
366 | if (rev.prune_data) { | |
367 | const char **pathspec = rev.prune_data; | |
368 | while (*pathspec) { | |
369 | if (!path) | |
370 | path = *pathspec; | |
371 | paths++; | |
372 | pathspec++; | |
373 | } | |
374 | } | |
375 | ||
376 | /* | |
377 | * Now, do the arguments look reasonable? | |
378 | */ | |
379 | if (!ents) { | |
380 | switch (blobs) { | |
381 | case 0: | |
0569e9b8 | 382 | result = builtin_diff_files(&rev, argc, argv); |
65056021 JH |
383 | break; |
384 | case 1: | |
385 | if (paths != 1) | |
386 | usage(builtin_diff_usage); | |
41bbf9d5 | 387 | result = builtin_diff_b_f(&rev, argc, argv, blob, path); |
65056021 JH |
388 | break; |
389 | case 2: | |
0fe7c1de JH |
390 | if (paths) |
391 | usage(builtin_diff_usage); | |
41bbf9d5 | 392 | result = builtin_diff_blobs(&rev, argc, argv, blob); |
65056021 JH |
393 | break; |
394 | default: | |
395 | usage(builtin_diff_usage); | |
396 | } | |
397 | } | |
398 | else if (blobs) | |
399 | usage(builtin_diff_usage); | |
400 | else if (ents == 1) | |
41bbf9d5 | 401 | result = builtin_diff_index(&rev, argc, argv); |
65056021 | 402 | else if (ents == 2) |
41bbf9d5 | 403 | result = builtin_diff_tree(&rev, argc, argv, ent); |
9919f41c JH |
404 | else if ((ents == 3) && (ent[0].item->flags & UNINTERESTING)) { |
405 | /* diff A...B where there is one sane merge base between | |
406 | * A and B. We have ent[0] == merge-base, ent[1] == A, | |
407 | * and ent[2] == B. Show diff between the base and B. | |
408 | */ | |
306ea2df | 409 | ent[1] = ent[2]; |
41bbf9d5 | 410 | result = builtin_diff_tree(&rev, argc, argv, ent); |
9919f41c | 411 | } |
0fe7c1de | 412 | else |
41bbf9d5 | 413 | result = builtin_diff_combined(&rev, argc, argv, |
9919f41c | 414 | ent, ents); |
da31b358 | 415 | result = diff_result_code(&rev.diffopt, result); |
aecbf914 JH |
416 | if (1 < rev.diffopt.skip_stat_unmatch) |
417 | refresh_index_quietly(); | |
41bbf9d5 | 418 | return result; |
65056021 | 419 | } |