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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" | |
302ad7a9 | 16 | #include "submodule.h" |
0041f09d | 17 | #include "sha1-array.h" |
65056021 | 18 | |
65056021 JH |
19 | struct blobinfo { |
20 | unsigned char sha1[20]; | |
21 | const char *name; | |
01618a3a | 22 | unsigned mode; |
65056021 JH |
23 | }; |
24 | ||
25 | static const char builtin_diff_usage[] = | |
9edb8a0f | 26 | "git diff [<options>] [<commit> [<commit>]] [--] [<path>...]"; |
65056021 | 27 | |
65056021 JH |
28 | static void stuff_change(struct diff_options *opt, |
29 | unsigned old_mode, unsigned new_mode, | |
30 | const unsigned char *old_sha1, | |
31 | const unsigned char *new_sha1, | |
e5450100 JK |
32 | int old_sha1_valid, |
33 | int new_sha1_valid, | |
65056021 JH |
34 | const char *old_name, |
35 | const char *new_name) | |
36 | { | |
37 | struct diff_filespec *one, *two; | |
38 | ||
0bef57ee | 39 | if (!is_null_sha1(old_sha1) && !is_null_sha1(new_sha1) && |
43342941 | 40 | !hashcmp(old_sha1, new_sha1) && (old_mode == new_mode)) |
65056021 JH |
41 | return; |
42 | ||
8f67f8ae | 43 | if (DIFF_OPT_TST(opt, REVERSE_DIFF)) { |
65056021 | 44 | unsigned tmp; |
d92f1dc6 | 45 | const unsigned char *tmp_u; |
65056021 JH |
46 | const char *tmp_c; |
47 | tmp = old_mode; old_mode = new_mode; new_mode = tmp; | |
48 | tmp_u = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_u; | |
49 | tmp_c = old_name; old_name = new_name; new_name = tmp_c; | |
50 | } | |
cd676a51 JH |
51 | |
52 | if (opt->prefix && | |
53 | (strncmp(old_name, opt->prefix, opt->prefix_length) || | |
54 | strncmp(new_name, opt->prefix, opt->prefix_length))) | |
55 | return; | |
56 | ||
65056021 JH |
57 | one = alloc_filespec(old_name); |
58 | two = alloc_filespec(new_name); | |
e5450100 JK |
59 | fill_filespec(one, old_sha1, old_sha1_valid, old_mode); |
60 | fill_filespec(two, new_sha1, new_sha1_valid, new_mode); | |
65056021 | 61 | |
65056021 JH |
62 | diff_queue(&diff_queued_diff, one, two); |
63 | } | |
64 | ||
65 | static int builtin_diff_b_f(struct rev_info *revs, | |
66 | int argc, const char **argv, | |
67 | struct blobinfo *blob, | |
68 | const char *path) | |
69 | { | |
70 | /* Blob vs file in the working tree*/ | |
71 | struct stat st; | |
72 | ||
a610786f TH |
73 | if (argc > 1) |
74 | usage(builtin_diff_usage); | |
75 | ||
65056021 | 76 | if (lstat(path, &st)) |
54214529 | 77 | die_errno(_("failed to stat '%s'"), path); |
65056021 | 78 | if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) |
54214529 | 79 | die(_("'%s': not a regular file or symlink"), path); |
01618a3a | 80 | |
a5a818ee JH |
81 | diff_set_mnemonic_prefix(&revs->diffopt, "o/", "w/"); |
82 | ||
01618a3a MK |
83 | if (blob[0].mode == S_IFINVALID) |
84 | blob[0].mode = canon_mode(st.st_mode); | |
85 | ||
65056021 | 86 | stuff_change(&revs->diffopt, |
01618a3a | 87 | blob[0].mode, canon_mode(st.st_mode), |
65056021 | 88 | blob[0].sha1, null_sha1, |
e5450100 | 89 | 1, 0, |
065e0b12 | 90 | path, path); |
65056021 JH |
91 | diffcore_std(&revs->diffopt); |
92 | diff_flush(&revs->diffopt); | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static int builtin_diff_blobs(struct rev_info *revs, | |
97 | int argc, const char **argv, | |
98 | struct blobinfo *blob) | |
99 | { | |
65056021 JH |
100 | unsigned mode = canon_mode(S_IFREG | 0644); |
101 | ||
a610786f TH |
102 | if (argc > 1) |
103 | usage(builtin_diff_usage); | |
104 | ||
01618a3a MK |
105 | if (blob[0].mode == S_IFINVALID) |
106 | blob[0].mode = mode; | |
107 | ||
108 | if (blob[1].mode == S_IFINVALID) | |
109 | blob[1].mode = mode; | |
110 | ||
65056021 | 111 | stuff_change(&revs->diffopt, |
01618a3a | 112 | blob[0].mode, blob[1].mode, |
f82cd3c6 | 113 | blob[0].sha1, blob[1].sha1, |
e5450100 | 114 | 1, 1, |
53dd8a9c | 115 | blob[0].name, blob[1].name); |
65056021 JH |
116 | diffcore_std(&revs->diffopt); |
117 | diff_flush(&revs->diffopt); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int builtin_diff_index(struct rev_info *revs, | |
122 | int argc, const char **argv) | |
123 | { | |
124 | int cached = 0; | |
125 | while (1 < argc) { | |
126 | const char *arg = argv[1]; | |
2baf1850 | 127 | if (!strcmp(arg, "--cached") || !strcmp(arg, "--staged")) |
65056021 | 128 | cached = 1; |
65056021 JH |
129 | else |
130 | usage(builtin_diff_usage); | |
131 | argv++; argc--; | |
132 | } | |
4f38f6b5 NTND |
133 | if (!cached) |
134 | setup_work_tree(); | |
65056021 JH |
135 | /* |
136 | * Make sure there is one revision (i.e. pending object), | |
137 | * and there is no revision filtering parameters. | |
138 | */ | |
1f1e895f | 139 | if (revs->pending.nr != 1 || |
65056021 JH |
140 | revs->max_count != -1 || revs->min_age != -1 || |
141 | revs->max_age != -1) | |
142 | usage(builtin_diff_usage); | |
66f13625 | 143 | if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) { |
671c9b7e | 144 | perror("read_cache_preload"); |
b4e1e4a7 JH |
145 | return -1; |
146 | } | |
65056021 JH |
147 | return run_diff_index(revs, cached); |
148 | } | |
149 | ||
150 | static int builtin_diff_tree(struct rev_info *revs, | |
151 | int argc, const char **argv, | |
1f1e895f | 152 | struct object_array_entry *ent) |
65056021 | 153 | { |
65056021 | 154 | const unsigned char *(sha1[2]); |
1f1e895f | 155 | int swap = 0; |
a610786f TH |
156 | |
157 | if (argc > 1) | |
158 | usage(builtin_diff_usage); | |
0fe7c1de JH |
159 | |
160 | /* We saw two trees, ent[0] and ent[1]. | |
82e5a82f | 161 | * if ent[1] is uninteresting, they are swapped |
0fe7c1de | 162 | */ |
1f1e895f LT |
163 | if (ent[1].item->flags & UNINTERESTING) |
164 | swap = 1; | |
65056021 JH |
165 | sha1[swap] = ent[0].item->sha1; |
166 | sha1[1-swap] = ent[1].item->sha1; | |
167 | diff_tree_sha1(sha1[0], sha1[1], "", &revs->diffopt); | |
168 | log_tree_diff_flush(revs); | |
169 | return 0; | |
170 | } | |
171 | ||
0fe7c1de JH |
172 | static int builtin_diff_combined(struct rev_info *revs, |
173 | int argc, const char **argv, | |
1f1e895f | 174 | struct object_array_entry *ent, |
0fe7c1de JH |
175 | int ents) |
176 | { | |
0041f09d | 177 | struct sha1_array parents = SHA1_ARRAY_INIT; |
0fe7c1de JH |
178 | int i; |
179 | ||
a610786f TH |
180 | if (argc > 1) |
181 | usage(builtin_diff_usage); | |
182 | ||
0fe7c1de JH |
183 | if (!revs->dense_combined_merges && !revs->combine_merges) |
184 | revs->dense_combined_merges = revs->combine_merges = 1; | |
0041f09d RS |
185 | for (i = 1; i < ents; i++) |
186 | sha1_array_append(&parents, ent[i].item->sha1); | |
187 | diff_tree_combined(ent[0].item->sha1, &parents, | |
0fe7c1de | 188 | revs->dense_combined_merges, revs); |
0041f09d | 189 | sha1_array_clear(&parents); |
0fe7c1de JH |
190 | return 0; |
191 | } | |
192 | ||
aecbf914 JH |
193 | static void refresh_index_quietly(void) |
194 | { | |
195 | struct lock_file *lock_file; | |
196 | int fd; | |
197 | ||
198 | lock_file = xcalloc(1, sizeof(struct lock_file)); | |
199 | fd = hold_locked_index(lock_file, 0); | |
200 | if (fd < 0) | |
201 | return; | |
202 | discard_cache(); | |
203 | read_cache(); | |
204 | refresh_cache(REFRESH_QUIET|REFRESH_UNMERGED); | |
ccdc4ec3 | 205 | update_index_if_able(&the_index, lock_file); |
aecbf914 JH |
206 | } |
207 | ||
0569e9b8 JH |
208 | static int builtin_diff_files(struct rev_info *revs, int argc, const char **argv) |
209 | { | |
0569e9b8 JH |
210 | unsigned int options = 0; |
211 | ||
212 | while (1 < argc && argv[1][0] == '-') { | |
213 | if (!strcmp(argv[1], "--base")) | |
214 | revs->max_count = 1; | |
215 | else if (!strcmp(argv[1], "--ours")) | |
216 | revs->max_count = 2; | |
217 | else if (!strcmp(argv[1], "--theirs")) | |
218 | revs->max_count = 3; | |
219 | else if (!strcmp(argv[1], "-q")) | |
220 | options |= DIFF_SILENT_ON_REMOVED; | |
1c370ea4 MM |
221 | else if (!strcmp(argv[1], "-h")) |
222 | usage(builtin_diff_usage); | |
0569e9b8 | 223 | else |
54214529 | 224 | return error(_("invalid option: %s"), argv[1]); |
0569e9b8 JH |
225 | argv++; argc--; |
226 | } | |
227 | ||
903e09a3 JH |
228 | /* |
229 | * "diff --base" should not combine merges because it was not | |
230 | * asked to. "diff -c" should not densify (if the user wants | |
231 | * dense one, --cc can be explicitly asked for, or just rely | |
232 | * on the default). | |
233 | */ | |
234 | if (revs->max_count == -1 && !revs->combine_merges && | |
0569e9b8 JH |
235 | (revs->diffopt.output_format & DIFF_FORMAT_PATCH)) |
236 | revs->combine_merges = revs->dense_combined_merges = 1; | |
237 | ||
4f38f6b5 | 238 | setup_work_tree(); |
66f13625 | 239 | if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) { |
671c9b7e | 240 | perror("read_cache_preload"); |
0569e9b8 JH |
241 | return -1; |
242 | } | |
e7c3a59c | 243 | return run_diff_files(revs, options); |
0569e9b8 JH |
244 | } |
245 | ||
a633fca0 | 246 | int cmd_diff(int argc, const char **argv, const char *prefix) |
65056021 | 247 | { |
1f1e895f | 248 | int i; |
65056021 | 249 | struct rev_info rev; |
1f1e895f | 250 | struct object_array_entry ent[100]; |
65056021 | 251 | int ents = 0, blobs = 0, paths = 0; |
a633fca0 | 252 | const char *path = NULL; |
65056021 | 253 | struct blobinfo blob[2]; |
af05d679 | 254 | int nongit; |
41bbf9d5 | 255 | int result = 0; |
65056021 JH |
256 | |
257 | /* | |
258 | * We could get N tree-ish in the rev.pending_objects list. | |
259 | * Also there could be M blobs there, and P pathspecs. | |
260 | * | |
261 | * N=0, M=0: | |
262 | * cache vs files (diff-files) | |
263 | * N=0, M=2: | |
264 | * compare two random blobs. P must be zero. | |
265 | * N=0, M=1, P=1: | |
266 | * compare a blob with a working tree file. | |
267 | * | |
268 | * N=1, M=0: | |
269 | * tree vs cache (diff-index --cached) | |
270 | * | |
271 | * N=2, M=0: | |
272 | * tree vs tree (diff-tree) | |
273 | * | |
0569e9b8 JH |
274 | * N=0, M=0, P=2: |
275 | * compare two filesystem entities (aka --no-index). | |
276 | * | |
65056021 JH |
277 | * Other cases are errors. |
278 | */ | |
230f544e | 279 | |
d516c2d1 | 280 | prefix = setup_git_directory_gently(&nongit); |
302ad7a9 | 281 | gitmodules_config(); |
ef90d6d4 | 282 | git_config(git_diff_ui_config, NULL); |
6b2f2d98 | 283 | |
db6296a5 | 284 | init_revisions(&rev, prefix); |
0569e9b8 JH |
285 | |
286 | /* If this is a no-index diff, just run it and exit there. */ | |
287 | diff_no_index(&rev, argc, argv, nongit, prefix); | |
288 | ||
289 | /* Otherwise, we are doing the usual "git" diff */ | |
aecbf914 | 290 | rev.diffopt.skip_stat_unmatch = !!diff_auto_refresh_index; |
65056021 | 291 | |
df44483a | 292 | /* Scale to real terminal size and respect statGraphWidth config */ |
af9fedc1 | 293 | rev.diffopt.stat_width = -1; |
df44483a | 294 | rev.diffopt.stat_graph_width = -1; |
af9fedc1 | 295 | |
5ec11af6 | 296 | /* Default to let external and textconv be used */ |
61af494c | 297 | DIFF_OPT_SET(&rev.diffopt, ALLOW_EXTERNAL); |
5ec11af6 | 298 | DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV); |
61af494c | 299 | |
0569e9b8 | 300 | if (nongit) |
54214529 | 301 | die(_("Not a git repository")); |
0569e9b8 | 302 | argc = setup_revisions(argc, argv, &rev, NULL); |
047fbe90 | 303 | if (!rev.diffopt.output_format) { |
c9b5ef99 | 304 | rev.diffopt.output_format = DIFF_FORMAT_PATCH; |
28452655 | 305 | diff_setup_done(&rev.diffopt); |
047fbe90 | 306 | } |
61af494c | 307 | |
8f67f8ae | 308 | DIFF_OPT_SET(&rev.diffopt, RECURSIVE); |
c9b5ef99 | 309 | |
1af3d977 | 310 | setup_diff_pager(&rev.diffopt); |
89d07f75 | 311 | |
0569e9b8 JH |
312 | /* |
313 | * Do we have --cached and not have a pending object, then | |
65056021 JH |
314 | * default to HEAD by hand. Eek. |
315 | */ | |
1f1e895f | 316 | if (!rev.pending.nr) { |
65056021 JH |
317 | int i; |
318 | for (i = 1; i < argc; i++) { | |
319 | const char *arg = argv[i]; | |
320 | if (!strcmp(arg, "--")) | |
321 | break; | |
2baf1850 DS |
322 | else if (!strcmp(arg, "--cached") || |
323 | !strcmp(arg, "--staged")) { | |
3384a2df | 324 | add_head_to_pending(&rev); |
a2b7a3b3 NTND |
325 | if (!rev.pending.nr) { |
326 | struct tree *tree; | |
cba595bd | 327 | tree = lookup_tree(EMPTY_TREE_SHA1_BIN); |
a2b7a3b3 NTND |
328 | add_pending_object(&rev, &tree->object, "HEAD"); |
329 | } | |
65056021 JH |
330 | break; |
331 | } | |
332 | } | |
333 | } | |
334 | ||
1f1e895f LT |
335 | for (i = 0; i < rev.pending.nr; i++) { |
336 | struct object_array_entry *list = rev.pending.objects+i; | |
65056021 JH |
337 | struct object *obj = list->item; |
338 | const char *name = list->name; | |
339 | int flags = (obj->flags & UNINTERESTING); | |
340 | if (!obj->parsed) | |
341 | obj = parse_object(obj->sha1); | |
342 | obj = deref_tag(obj, NULL, 0); | |
343 | if (!obj) | |
54214529 | 344 | die(_("invalid object '%s' given."), name); |
1974632c | 345 | if (obj->type == OBJ_COMMIT) |
65056021 | 346 | obj = &((struct commit *)obj)->tree->object; |
1974632c | 347 | if (obj->type == OBJ_TREE) { |
0fe7c1de | 348 | if (ARRAY_SIZE(ent) <= ents) |
54214529 | 349 | die(_("more than %d trees given: '%s'"), |
334b506a | 350 | (int) ARRAY_SIZE(ent), name); |
65056021 JH |
351 | obj->flags |= flags; |
352 | ent[ents].item = obj; | |
353 | ent[ents].name = name; | |
354 | ents++; | |
355 | continue; | |
356 | } | |
1974632c | 357 | if (obj->type == OBJ_BLOB) { |
65056021 | 358 | if (2 <= blobs) |
54214529 | 359 | die(_("more than two blobs given: '%s'"), name); |
e702496e | 360 | hashcpy(blob[blobs].sha1, obj->sha1); |
65056021 | 361 | blob[blobs].name = name; |
01618a3a | 362 | blob[blobs].mode = list->mode; |
65056021 JH |
363 | blobs++; |
364 | continue; | |
230f544e | 365 | |
65056021 | 366 | } |
54214529 | 367 | die(_("unhandled object '%s' given."), name); |
65056021 | 368 | } |
afe069d1 NTND |
369 | if (rev.prune_data.nr) { |
370 | if (!path) | |
371 | path = rev.prune_data.items[0].match; | |
372 | paths += rev.prune_data.nr; | |
65056021 JH |
373 | } |
374 | ||
375 | /* | |
376 | * Now, do the arguments look reasonable? | |
377 | */ | |
378 | if (!ents) { | |
379 | switch (blobs) { | |
380 | case 0: | |
0569e9b8 | 381 | result = builtin_diff_files(&rev, argc, argv); |
65056021 JH |
382 | break; |
383 | case 1: | |
384 | if (paths != 1) | |
385 | usage(builtin_diff_usage); | |
41bbf9d5 | 386 | result = builtin_diff_b_f(&rev, argc, argv, blob, path); |
65056021 JH |
387 | break; |
388 | case 2: | |
0fe7c1de JH |
389 | if (paths) |
390 | usage(builtin_diff_usage); | |
41bbf9d5 | 391 | result = builtin_diff_blobs(&rev, argc, argv, blob); |
65056021 JH |
392 | break; |
393 | default: | |
394 | usage(builtin_diff_usage); | |
395 | } | |
396 | } | |
397 | else if (blobs) | |
398 | usage(builtin_diff_usage); | |
399 | else if (ents == 1) | |
41bbf9d5 | 400 | result = builtin_diff_index(&rev, argc, argv); |
65056021 | 401 | else if (ents == 2) |
41bbf9d5 | 402 | result = builtin_diff_tree(&rev, argc, argv, ent); |
c008c0ff | 403 | else if (ent[0].item->flags & UNINTERESTING) { |
c008c0ff JH |
404 | /* |
405 | * diff A...B where there is at least one merge base | |
406 | * between A and B. We have ent[0] == merge-base, | |
407 | * ent[ents-2] == A, and ent[ents-1] == B. Show diff | |
408 | * between the base and B. Note that we pick one | |
409 | * merge base at random if there are more than one. | |
410 | */ | |
411 | ent[1] = ent[ents-1]; | |
41bbf9d5 | 412 | result = builtin_diff_tree(&rev, argc, argv, ent); |
c008c0ff | 413 | } else |
41bbf9d5 | 414 | result = builtin_diff_combined(&rev, argc, argv, |
c008c0ff | 415 | ent, ents); |
da31b358 | 416 | result = diff_result_code(&rev.diffopt, result); |
aecbf914 JH |
417 | if (1 < rev.diffopt.skip_stat_unmatch) |
418 | refresh_index_quietly(); | |
41bbf9d5 | 419 | return result; |
65056021 | 420 | } |
1af3d977 JK |
421 | |
422 | void setup_diff_pager(struct diff_options *opt) | |
423 | { | |
424 | /* | |
425 | * If the user asked for our exit code, then either they want --quiet | |
426 | * or --exit-code. We should definitely not bother with a pager in the | |
427 | * former case, as we will generate no output. Since we still properly | |
428 | * report our exit code even when a pager is run, we _could_ run a | |
429 | * pager with --exit-code. But since we have not done so historically, | |
430 | * and because it is easy to find people oneline advising "git diff | |
431 | * --exit-code" in hooks and other scripts, we do not do so. | |
432 | */ | |
433 | if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) && | |
434 | check_pager_config("diff") != 0) | |
435 | setup_pager(); | |
436 | } |