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Commit | Line | Data |
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ac1b3d12 LT |
1 | /* |
2 | * Helper functions for tree diff generation | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "diff.h" | |
750f7b66 | 6 | #include "diffcore.h" |
8e440259 | 7 | #include "tree.h" |
ac1b3d12 | 8 | |
b9081a65 KS |
9 | |
10 | static int ll_diff_tree_sha1(const unsigned char *old, const unsigned char *new, | |
11 | const char *base_str, struct diff_options *opt); | |
12 | ||
9bc06196 KS |
13 | /* |
14 | * Compare two tree entries, taking into account only path/S_ISDIR(mode), | |
15 | * but not their sha1's. | |
16 | * | |
17 | * NOTE files and directories *always* compare differently, even when having | |
18 | * the same name - thanks to base_name_compare(). | |
6ca844e9 KS |
19 | * |
20 | * NOTE empty (=invalid) descriptor(s) take part in comparison as +infty, | |
21 | * so that they sort *after* valid tree entries. | |
22 | * | |
23 | * Due to this convention, if trees are scanned in sorted order, all | |
24 | * non-empty descriptors will be processed first. | |
9bc06196 KS |
25 | */ |
26 | static int tree_entry_pathcmp(struct tree_desc *t1, struct tree_desc *t2) | |
ac1b3d12 | 27 | { |
1a27a154 KS |
28 | struct name_entry *e1, *e2; |
29 | int cmp; | |
ac1b3d12 | 30 | |
6ca844e9 KS |
31 | /* empty descriptors sort after valid tree entries */ |
32 | if (!t1->size) | |
33 | return t2->size ? 1 : 0; | |
34 | else if (!t2->size) | |
35 | return -1; | |
36 | ||
1a27a154 KS |
37 | e1 = &t1->entry; |
38 | e2 = &t2->entry; | |
39 | cmp = base_name_compare(e1->path, tree_entry_len(e1), e1->mode, | |
40 | e2->path, tree_entry_len(e2), e2->mode); | |
903bba68 | 41 | return cmp; |
d00e980c KS |
42 | } |
43 | ||
44 | ||
45 | /* convert path, t1/t2 -> opt->diff_*() callbacks */ | |
46 | static void emit_diff(struct diff_options *opt, struct strbuf *path, | |
47 | struct tree_desc *t1, struct tree_desc *t2) | |
48 | { | |
49 | unsigned int mode1 = t1 ? t1->entry.mode : 0; | |
50 | unsigned int mode2 = t2 ? t2->entry.mode : 0; | |
51 | ||
52 | if (mode1 && mode2) { | |
53 | opt->change(opt, mode1, mode2, t1->entry.sha1, t2->entry.sha1, | |
54 | 1, 1, path->buf, 0, 0); | |
55 | } | |
56 | else { | |
57 | const unsigned char *sha1; | |
58 | unsigned int mode; | |
59 | int addremove; | |
60 | ||
61 | if (mode2) { | |
62 | addremove = '+'; | |
63 | sha1 = t2->entry.sha1; | |
64 | mode = mode2; | |
65 | } else { | |
66 | addremove = '-'; | |
67 | sha1 = t1->entry.sha1; | |
68 | mode = mode1; | |
fd55a19e | 69 | } |
d00e980c KS |
70 | |
71 | opt->add_remove(opt, addremove, mode, sha1, 1, path->buf, 0); | |
ac1b3d12 | 72 | } |
ac1b3d12 LT |
73 | } |
74 | ||
d00e980c KS |
75 | |
76 | /* new path should be added to diff | |
77 | * | |
78 | * 3 cases on how/when it should be called and behaves: | |
79 | * | |
80 | * !t1, t2 -> path added, parent lacks it | |
81 | * t1, !t2 -> path removed from parent | |
82 | * t1, t2 -> path modified | |
83 | */ | |
84 | static void show_path(struct strbuf *base, struct diff_options *opt, | |
85 | struct tree_desc *t1, struct tree_desc *t2) | |
ac1b3d12 LT |
86 | { |
87 | unsigned mode; | |
88 | const char *path; | |
d00e980c | 89 | int pathlen; |
48932677 | 90 | int old_baselen = base->len; |
d00e980c KS |
91 | int isdir, recurse = 0, emitthis = 1; |
92 | ||
93 | /* at least something has to be valid */ | |
94 | assert(t1 || t2); | |
95 | ||
96 | if (t2) { | |
97 | /* path present in resulting tree */ | |
98 | tree_entry_extract(t2, &path, &mode); | |
99 | pathlen = tree_entry_len(&t2->entry); | |
100 | isdir = S_ISDIR(mode); | |
101 | } else { | |
102 | /* | |
103 | * a path was removed - take path from parent. Also take | |
104 | * mode from parent, to decide on recursion. | |
105 | */ | |
106 | tree_entry_extract(t1, &path, &mode); | |
107 | pathlen = tree_entry_len(&t1->entry); | |
108 | ||
109 | isdir = S_ISDIR(mode); | |
110 | mode = 0; | |
111 | } | |
112 | ||
113 | if (DIFF_OPT_TST(opt, RECURSIVE) && isdir) { | |
114 | recurse = 1; | |
115 | emitthis = DIFF_OPT_TST(opt, TREE_IN_RECURSIVE); | |
116 | } | |
ac1b3d12 | 117 | |
48932677 | 118 | strbuf_add(base, path, pathlen); |
df533f34 | 119 | |
d00e980c KS |
120 | if (emitthis) |
121 | emit_diff(opt, base, t1, t2); | |
122 | ||
123 | if (recurse) { | |
48932677 | 124 | strbuf_addch(base, '/'); |
b9081a65 KS |
125 | ll_diff_tree_sha1(t1 ? t1->entry.sha1 : NULL, |
126 | t2 ? t2->entry.sha1 : NULL, base->buf, opt); | |
d00e980c | 127 | } |
48932677 NTND |
128 | |
129 | strbuf_setlen(base, old_baselen); | |
ac1b3d12 LT |
130 | } |
131 | ||
48932677 | 132 | static void skip_uninteresting(struct tree_desc *t, struct strbuf *base, |
e9066121 | 133 | struct diff_options *opt) |
5d865017 | 134 | { |
e9066121 KS |
135 | enum interesting match; |
136 | ||
5d865017 | 137 | while (t->size) { |
e9066121 KS |
138 | match = tree_entry_interesting(&t->entry, base, 0, &opt->pathspec); |
139 | if (match) { | |
140 | if (match == all_entries_not_interesting) | |
97d0b74a NTND |
141 | t->size = 0; |
142 | break; | |
5d865017 | 143 | } |
97d0b74a | 144 | update_tree_entry(t); |
5d865017 LT |
145 | } |
146 | } | |
147 | ||
52894e70 KS |
148 | static int ll_diff_tree_sha1(const unsigned char *old, const unsigned char *new, |
149 | const char *base_str, struct diff_options *opt) | |
ac1b3d12 | 150 | { |
52894e70 KS |
151 | struct tree_desc t1, t2; |
152 | void *t1tree, *t2tree; | |
48932677 NTND |
153 | struct strbuf base; |
154 | int baselen = strlen(base_str); | |
304de2d2 | 155 | |
52894e70 KS |
156 | t1tree = fill_tree_descriptor(&t1, old); |
157 | t2tree = fill_tree_descriptor(&t2, new); | |
158 | ||
bc96cc87 NTND |
159 | /* Enable recursion indefinitely */ |
160 | opt->pathspec.recursive = DIFF_OPT_TST(opt, RECURSIVE); | |
bc96cc87 | 161 | |
48932677 NTND |
162 | strbuf_init(&base, PATH_MAX); |
163 | strbuf_add(&base, base_str, baselen); | |
164 | ||
5d865017 | 165 | for (;;) { |
903bba68 KS |
166 | int cmp; |
167 | ||
28b9264d | 168 | if (diff_can_quit_early(opt)) |
822cac01 | 169 | break; |
66f13625 | 170 | if (opt->pathspec.nr) { |
52894e70 KS |
171 | skip_uninteresting(&t1, &base, opt); |
172 | skip_uninteresting(&t2, &base, opt); | |
ac1b3d12 | 173 | } |
52894e70 | 174 | if (!t1.size && !t2.size) |
6ca844e9 | 175 | break; |
5dfb2bbd | 176 | |
52894e70 | 177 | cmp = tree_entry_pathcmp(&t1, &t2); |
5dfb2bbd KS |
178 | |
179 | /* t1 = t2 */ | |
180 | if (cmp == 0) { | |
903bba68 | 181 | if (DIFF_OPT_TST(opt, FIND_COPIES_HARDER) || |
52894e70 KS |
182 | hashcmp(t1.entry.sha1, t2.entry.sha1) || |
183 | (t1.entry.mode != t2.entry.mode)) | |
184 | show_path(&base, opt, &t1, &t2); | |
903bba68 | 185 | |
52894e70 KS |
186 | update_tree_entry(&t1); |
187 | update_tree_entry(&t2); | |
5dfb2bbd KS |
188 | } |
189 | ||
190 | /* t1 < t2 */ | |
191 | else if (cmp < 0) { | |
52894e70 KS |
192 | show_path(&base, opt, &t1, /*t2=*/NULL); |
193 | update_tree_entry(&t1); | |
5dfb2bbd KS |
194 | } |
195 | ||
196 | /* t1 > t2 */ | |
197 | else { | |
52894e70 KS |
198 | show_path(&base, opt, /*t1=*/NULL, &t2); |
199 | update_tree_entry(&t2); | |
ac1b3d12 | 200 | } |
ac1b3d12 | 201 | } |
48932677 NTND |
202 | |
203 | strbuf_release(&base); | |
52894e70 KS |
204 | free(t2tree); |
205 | free(t1tree); | |
ac1b3d12 LT |
206 | return 0; |
207 | } | |
208 | ||
750f7b66 LT |
209 | /* |
210 | * Does it look like the resulting diff might be due to a rename? | |
211 | * - single entry | |
212 | * - not a valid previous file | |
213 | */ | |
214 | static inline int diff_might_be_rename(void) | |
215 | { | |
216 | return diff_queued_diff.nr == 1 && | |
217 | !DIFF_FILE_VALID(diff_queued_diff.queue[0]->one); | |
218 | } | |
219 | ||
52894e70 | 220 | static void try_to_follow_renames(const unsigned char *old, const unsigned char *new, const char *base, struct diff_options *opt) |
750f7b66 LT |
221 | { |
222 | struct diff_options diff_opts; | |
9f38e1ef LT |
223 | struct diff_queue_struct *q = &diff_queued_diff; |
224 | struct diff_filepair *choice; | |
750f7b66 LT |
225 | int i; |
226 | ||
8f4f8f45 NTND |
227 | /* |
228 | * follow-rename code is very specific, we need exactly one | |
229 | * path. Magic that matches more than one path is not | |
230 | * supported. | |
231 | */ | |
5c6933d2 | 232 | GUARD_PATHSPEC(&opt->pathspec, PATHSPEC_FROMTOP | PATHSPEC_LITERAL); |
8f4f8f45 NTND |
233 | #if 0 |
234 | /* | |
235 | * We should reject wildcards as well. Unfortunately we | |
236 | * haven't got a reliable way to detect that 'foo\*bar' in | |
237 | * fact has no wildcards. nowildcard_len is merely a hint for | |
238 | * optimization. Let it slip for now until wildmatch is taught | |
239 | * about dry-run mode and returns wildcard info. | |
240 | */ | |
241 | if (opt->pathspec.has_wildcard) | |
242 | die("BUG:%s:%d: wildcards are not supported", | |
243 | __FILE__, __LINE__); | |
244 | #endif | |
245 | ||
9f38e1ef LT |
246 | /* Remove the file creation entry from the diff queue, and remember it */ |
247 | choice = q->queue[0]; | |
248 | q->nr = 0; | |
249 | ||
750f7b66 | 250 | diff_setup(&diff_opts); |
8f67f8ae | 251 | DIFF_OPT_SET(&diff_opts, RECURSIVE); |
0cdca133 | 252 | DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER); |
750f7b66 | 253 | diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT; |
61588ccf | 254 | diff_opts.single_follow = opt->pathspec.items[0].match; |
6dd4b66f | 255 | diff_opts.break_opt = opt->break_opt; |
dd98d88b | 256 | diff_opts.rename_score = opt->rename_score; |
28452655 | 257 | diff_setup_done(&diff_opts); |
52894e70 | 258 | ll_diff_tree_sha1(old, new, base, &diff_opts); |
750f7b66 | 259 | diffcore_std(&diff_opts); |
bd1928df | 260 | free_pathspec(&diff_opts.pathspec); |
750f7b66 | 261 | |
9f38e1ef | 262 | /* Go through the new set of filepairing, and see if we find a more interesting one */ |
44c48a90 | 263 | opt->found_follow = 0; |
9f38e1ef LT |
264 | for (i = 0; i < q->nr; i++) { |
265 | struct diff_filepair *p = q->queue[i]; | |
750f7b66 LT |
266 | |
267 | /* | |
268 | * Found a source? Not only do we use that for the new | |
9f38e1ef | 269 | * diff_queued_diff, we will also use that as the path in |
750f7b66 LT |
270 | * the future! |
271 | */ | |
66f13625 | 272 | if ((p->status == 'R' || p->status == 'C') && |
61588ccf | 273 | !strcmp(p->two->path, opt->pathspec.items[0].match)) { |
9a087274 NTND |
274 | const char *path[2]; |
275 | ||
9f38e1ef LT |
276 | /* Switch the file-pairs around */ |
277 | q->queue[i] = choice; | |
278 | choice = p; | |
279 | ||
280 | /* Update the path we use from now on.. */ | |
9a087274 NTND |
281 | path[0] = p->one->path; |
282 | path[1] = NULL; | |
bd1928df | 283 | free_pathspec(&opt->pathspec); |
4a2d5ae2 NTND |
284 | parse_pathspec(&opt->pathspec, |
285 | PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL, | |
286 | PATHSPEC_LITERAL_PATH, "", path); | |
44c48a90 JH |
287 | |
288 | /* | |
289 | * The caller expects us to return a set of vanilla | |
290 | * filepairs to let a later call to diffcore_std() | |
291 | * it makes to sort the renames out (among other | |
292 | * things), but we already have found renames | |
293 | * ourselves; signal diffcore_std() not to muck with | |
294 | * rename information. | |
295 | */ | |
296 | opt->found_follow = 1; | |
750f7b66 LT |
297 | break; |
298 | } | |
299 | } | |
300 | ||
301 | /* | |
3ea3c215 | 302 | * Then, discard all the non-relevant file pairs... |
9f38e1ef LT |
303 | */ |
304 | for (i = 0; i < q->nr; i++) { | |
305 | struct diff_filepair *p = q->queue[i]; | |
306 | diff_free_filepair(p); | |
307 | } | |
308 | ||
309 | /* | |
310 | * .. and re-instate the one we want (which might be either the | |
311 | * original one, or the rename/copy we found) | |
750f7b66 | 312 | */ |
9f38e1ef LT |
313 | q->queue[0] = choice; |
314 | q->nr = 1; | |
750f7b66 LT |
315 | } |
316 | ||
ac1b3d12 LT |
317 | int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base, struct diff_options *opt) |
318 | { | |
ac1b3d12 LT |
319 | int retval; |
320 | ||
52894e70 KS |
321 | retval = ll_diff_tree_sha1(old, new, base, opt); |
322 | if (!*base && DIFF_OPT_TST(opt, FOLLOW_RENAMES) && diff_might_be_rename()) | |
323 | try_to_follow_renames(old, new, base, opt); | |
324 | ||
ac1b3d12 LT |
325 | return retval; |
326 | } | |
327 | ||
2b60356d RS |
328 | int diff_root_tree_sha1(const unsigned char *new, const char *base, struct diff_options *opt) |
329 | { | |
0b707c33 | 330 | return diff_tree_sha1(NULL, new, base, opt); |
2b60356d | 331 | } |