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1 | #include "builtin.h" | |
2 | #include "cache.h" | |
3 | #include "commit.h" | |
4 | #include "tag.h" | |
5 | #include "refs.h" | |
6 | #include "parse-options.h" | |
7 | ||
8 | #define CUTOFF_DATE_SLOP 86400 /* one day */ | |
9 | ||
10 | typedef struct rev_name { | |
11 | const char *tip_name; | |
12 | int generation; | |
13 | int distance; | |
14 | } rev_name; | |
15 | ||
16 | static long cutoff = LONG_MAX; | |
17 | ||
18 | /* How many generations are maximally preferred over _one_ merge traversal? */ | |
19 | #define MERGE_TRAVERSAL_WEIGHT 65535 | |
20 | ||
21 | static void name_rev(struct commit *commit, | |
22 | const char *tip_name, int generation, int distance, | |
23 | int deref) | |
24 | { | |
25 | struct rev_name *name = (struct rev_name *)commit->util; | |
26 | struct commit_list *parents; | |
27 | int parent_number = 1; | |
28 | ||
29 | if (!commit->object.parsed) | |
30 | parse_commit(commit); | |
31 | ||
32 | if (commit->date < cutoff) | |
33 | return; | |
34 | ||
35 | if (deref) { | |
36 | char *new_name = xmalloc(strlen(tip_name)+3); | |
37 | strcpy(new_name, tip_name); | |
38 | strcat(new_name, "^0"); | |
39 | tip_name = new_name; | |
40 | ||
41 | if (generation) | |
42 | die("generation: %d, but deref?", generation); | |
43 | } | |
44 | ||
45 | if (name == NULL) { | |
46 | name = xmalloc(sizeof(rev_name)); | |
47 | commit->util = name; | |
48 | goto copy_data; | |
49 | } else if (name->distance > distance) { | |
50 | copy_data: | |
51 | name->tip_name = tip_name; | |
52 | name->generation = generation; | |
53 | name->distance = distance; | |
54 | } else | |
55 | return; | |
56 | ||
57 | for (parents = commit->parents; | |
58 | parents; | |
59 | parents = parents->next, parent_number++) { | |
60 | if (parent_number > 1) { | |
61 | int len = strlen(tip_name); | |
62 | char *new_name = xmalloc(len + | |
63 | 1 + decimal_length(generation) + /* ~<n> */ | |
64 | 1 + 2 + /* ^NN */ | |
65 | 1); | |
66 | ||
67 | if (len > 2 && !strcmp(tip_name + len - 2, "^0")) | |
68 | len -= 2; | |
69 | if (generation > 0) | |
70 | sprintf(new_name, "%.*s~%d^%d", len, tip_name, | |
71 | generation, parent_number); | |
72 | else | |
73 | sprintf(new_name, "%.*s^%d", len, tip_name, | |
74 | parent_number); | |
75 | ||
76 | name_rev(parents->item, new_name, 0, | |
77 | distance + MERGE_TRAVERSAL_WEIGHT, 0); | |
78 | } else { | |
79 | name_rev(parents->item, tip_name, generation + 1, | |
80 | distance + 1, 0); | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | struct name_ref_data { | |
86 | int tags_only; | |
87 | int name_only; | |
88 | const char *ref_filter; | |
89 | }; | |
90 | ||
91 | static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data) | |
92 | { | |
93 | struct object *o = parse_object(sha1); | |
94 | struct name_ref_data *data = cb_data; | |
95 | int deref = 0; | |
96 | ||
97 | if (data->tags_only && prefixcmp(path, "refs/tags/")) | |
98 | return 0; | |
99 | ||
100 | if (data->ref_filter && fnmatch(data->ref_filter, path, 0)) | |
101 | return 0; | |
102 | ||
103 | while (o && o->type == OBJ_TAG) { | |
104 | struct tag *t = (struct tag *) o; | |
105 | if (!t->tagged) | |
106 | break; /* broken repository */ | |
107 | o = parse_object(t->tagged->sha1); | |
108 | deref = 1; | |
109 | } | |
110 | if (o && o->type == OBJ_COMMIT) { | |
111 | struct commit *commit = (struct commit *)o; | |
112 | ||
113 | if (!prefixcmp(path, "refs/heads/")) | |
114 | path = path + 11; | |
115 | else if (data->tags_only | |
116 | && data->name_only | |
117 | && !prefixcmp(path, "refs/tags/")) | |
118 | path = path + 10; | |
119 | else if (!prefixcmp(path, "refs/")) | |
120 | path = path + 5; | |
121 | ||
122 | name_rev(commit, xstrdup(path), 0, 0, deref); | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* returns a static buffer */ | |
128 | static const char *get_rev_name(const struct object *o) | |
129 | { | |
130 | static char buffer[1024]; | |
131 | struct rev_name *n; | |
132 | struct commit *c; | |
133 | ||
134 | if (o->type != OBJ_COMMIT) | |
135 | return NULL; | |
136 | c = (struct commit *) o; | |
137 | n = c->util; | |
138 | if (!n) | |
139 | return NULL; | |
140 | ||
141 | if (!n->generation) | |
142 | return n->tip_name; | |
143 | else { | |
144 | int len = strlen(n->tip_name); | |
145 | if (len > 2 && !strcmp(n->tip_name + len - 2, "^0")) | |
146 | len -= 2; | |
147 | snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name, | |
148 | n->generation); | |
149 | ||
150 | return buffer; | |
151 | } | |
152 | } | |
153 | ||
154 | static void show_name(const struct object *obj, | |
155 | const char *caller_name, | |
156 | int always, int allow_undefined, int name_only) | |
157 | { | |
158 | const char *name; | |
159 | const unsigned char *sha1 = obj->sha1; | |
160 | ||
161 | if (!name_only) | |
162 | printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1)); | |
163 | name = get_rev_name(obj); | |
164 | if (name) | |
165 | printf("%s\n", name); | |
166 | else if (allow_undefined) | |
167 | printf("undefined\n"); | |
168 | else if (always) | |
169 | printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV)); | |
170 | else | |
171 | die("cannot describe '%s'", sha1_to_hex(sha1)); | |
172 | } | |
173 | ||
174 | static char const * const name_rev_usage[] = { | |
175 | "git name-rev [options] ( --all | --stdin | <commit>... )", | |
176 | NULL | |
177 | }; | |
178 | ||
179 | static void name_rev_line(char *p, struct name_ref_data *data) | |
180 | { | |
181 | int forty = 0; | |
182 | char *p_start; | |
183 | for (p_start = p; *p; p++) { | |
184 | #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f')) | |
185 | if (!ishex(*p)) | |
186 | forty = 0; | |
187 | else if (++forty == 40 && | |
188 | !ishex(*(p+1))) { | |
189 | unsigned char sha1[40]; | |
190 | const char *name = NULL; | |
191 | char c = *(p+1); | |
192 | int p_len = p - p_start + 1; | |
193 | ||
194 | forty = 0; | |
195 | ||
196 | *(p+1) = 0; | |
197 | if (!get_sha1(p - 39, sha1)) { | |
198 | struct object *o = | |
199 | lookup_object(sha1); | |
200 | if (o) | |
201 | name = get_rev_name(o); | |
202 | } | |
203 | *(p+1) = c; | |
204 | ||
205 | if (!name) | |
206 | continue; | |
207 | ||
208 | if (data->name_only) | |
209 | printf("%.*s%s", p_len - 40, p_start, name); | |
210 | else | |
211 | printf("%.*s (%s)", p_len, p_start, name); | |
212 | p_start = p + 1; | |
213 | } | |
214 | } | |
215 | ||
216 | /* flush */ | |
217 | if (p_start != p) | |
218 | fwrite(p_start, p - p_start, 1, stdout); | |
219 | } | |
220 | ||
221 | int cmd_name_rev(int argc, const char **argv, const char *prefix) | |
222 | { | |
223 | struct object_array revs = { 0, 0, NULL }; | |
224 | int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0; | |
225 | struct name_ref_data data = { 0, 0, NULL }; | |
226 | struct option opts[] = { | |
227 | OPT_BOOLEAN(0, "name-only", &data.name_only, "print only names (no SHA-1)"), | |
228 | OPT_BOOLEAN(0, "tags", &data.tags_only, "only use tags to name the commits"), | |
229 | OPT_STRING(0, "refs", &data.ref_filter, "pattern", | |
230 | "only use refs matching <pattern>"), | |
231 | OPT_GROUP(""), | |
232 | OPT_BOOLEAN(0, "all", &all, "list all commits reachable from all refs"), | |
233 | OPT_BOOLEAN(0, "stdin", &transform_stdin, "read from stdin"), | |
234 | OPT_BOOLEAN(0, "undefined", &allow_undefined, "allow to print `undefined` names"), | |
235 | OPT_BOOLEAN(0, "always", &always, | |
236 | "show abbreviated commit object as fallback"), | |
237 | OPT_END(), | |
238 | }; | |
239 | ||
240 | git_config(git_default_config, NULL); | |
241 | argc = parse_options(argc, argv, opts, name_rev_usage, 0); | |
242 | if (!!all + !!transform_stdin + !!argc > 1) { | |
243 | error("Specify either a list, or --all, not both!"); | |
244 | usage_with_options(name_rev_usage, opts); | |
245 | } | |
246 | if (all || transform_stdin) | |
247 | cutoff = 0; | |
248 | ||
249 | for (; argc; argc--, argv++) { | |
250 | unsigned char sha1[20]; | |
251 | struct object *o; | |
252 | struct commit *commit; | |
253 | ||
254 | if (get_sha1(*argv, sha1)) { | |
255 | fprintf(stderr, "Could not get sha1 for %s. Skipping.\n", | |
256 | *argv); | |
257 | continue; | |
258 | } | |
259 | ||
260 | o = deref_tag(parse_object(sha1), *argv, 0); | |
261 | if (!o || o->type != OBJ_COMMIT) { | |
262 | fprintf(stderr, "Could not get commit for %s. Skipping.\n", | |
263 | *argv); | |
264 | continue; | |
265 | } | |
266 | ||
267 | commit = (struct commit *)o; | |
268 | if (cutoff > commit->date) | |
269 | cutoff = commit->date; | |
270 | add_object_array((struct object *)commit, *argv, &revs); | |
271 | } | |
272 | ||
273 | if (cutoff) | |
274 | cutoff = cutoff - CUTOFF_DATE_SLOP; | |
275 | for_each_ref(name_ref, &data); | |
276 | ||
277 | if (transform_stdin) { | |
278 | char buffer[2048]; | |
279 | ||
280 | while (!feof(stdin)) { | |
281 | char *p = fgets(buffer, sizeof(buffer), stdin); | |
282 | if (!p) | |
283 | break; | |
284 | name_rev_line(p, &data); | |
285 | } | |
286 | } else if (all) { | |
287 | int i, max; | |
288 | ||
289 | max = get_max_object_index(); | |
290 | for (i = 0; i < max; i++) { | |
291 | struct object *obj = get_indexed_object(i); | |
292 | if (!obj) | |
293 | continue; | |
294 | show_name(obj, NULL, | |
295 | always, allow_undefined, data.name_only); | |
296 | } | |
297 | } else { | |
298 | int i; | |
299 | for (i = 0; i < revs.nr; i++) | |
300 | show_name(revs.objects[i].item, revs.objects[i].name, | |
301 | always, allow_undefined, data.name_only); | |
302 | } | |
303 | ||
304 | return 0; | |
305 | } |