1234ebb5d8ff3fb194b9d20f5497d5bfaeb6b5a8
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
10typedef struct rev_name {
11 const char *tip_name;
12 int generation;
13 int distance;
14} rev_name;
15
16static long cutoff = LONG_MAX;
17
18/* How many generations are maximally preferred over _one_ merge traversal? */
19#define MERGE_TRAVERSAL_WEIGHT 65535
20
21static 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) {
50copy_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
85static int subpath_matches(const char *path, const char *filter)
86{
87 const char *subpath = path;
88
89 while (subpath) {
90 if (!fnmatch(filter, subpath, 0))
91 return subpath - path;
92 subpath = strchr(subpath, '/');
93 if (subpath)
94 subpath++;
95 }
96 return -1;
97}
98
99static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
100{
101 if (shorten_unambiguous)
102 refname = shorten_unambiguous_ref(refname, 0);
103 else if (!prefixcmp(refname, "refs/heads/"))
104 refname = refname + 11;
105 else if (!prefixcmp(refname, "refs/"))
106 refname = refname + 5;
107 return refname;
108}
109
110struct name_ref_data {
111 int tags_only;
112 int name_only;
113 const char *ref_filter;
114};
115
116static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
117{
118 struct object *o = parse_object(sha1);
119 struct name_ref_data *data = cb_data;
120 int can_abbreviate_output = data->tags_only && data->name_only;
121 int deref = 0;
122
123 if (data->tags_only && prefixcmp(path, "refs/tags/"))
124 return 0;
125
126 if (data->ref_filter) {
127 switch (subpath_matches(path, data->ref_filter)) {
128 case -1: /* did not match */
129 return 0;
130 case 0: /* matched fully */
131 break;
132 default: /* matched subpath */
133 can_abbreviate_output = 1;
134 break;
135 }
136 }
137
138 while (o && o->type == OBJ_TAG) {
139 struct tag *t = (struct tag *) o;
140 if (!t->tagged)
141 break; /* broken repository */
142 o = parse_object(t->tagged->sha1);
143 deref = 1;
144 }
145 if (o && o->type == OBJ_COMMIT) {
146 struct commit *commit = (struct commit *)o;
147
148 path = name_ref_abbrev(path, can_abbreviate_output);
149 name_rev(commit, xstrdup(path), 0, 0, deref);
150 }
151 return 0;
152}
153
154/* returns a static buffer */
155static const char *get_rev_name(const struct object *o)
156{
157 static char buffer[1024];
158 struct rev_name *n;
159 struct commit *c;
160
161 if (o->type != OBJ_COMMIT)
162 return NULL;
163 c = (struct commit *) o;
164 n = c->util;
165 if (!n)
166 return NULL;
167
168 if (!n->generation)
169 return n->tip_name;
170 else {
171 int len = strlen(n->tip_name);
172 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
173 len -= 2;
174 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
175 n->generation);
176
177 return buffer;
178 }
179}
180
181static void show_name(const struct object *obj,
182 const char *caller_name,
183 int always, int allow_undefined, int name_only)
184{
185 const char *name;
186 const unsigned char *sha1 = obj->sha1;
187
188 if (!name_only)
189 printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
190 name = get_rev_name(obj);
191 if (name)
192 printf("%s\n", name);
193 else if (allow_undefined)
194 printf("undefined\n");
195 else if (always)
196 printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
197 else
198 die("cannot describe '%s'", sha1_to_hex(sha1));
199}
200
201static char const * const name_rev_usage[] = {
202 N_("git name-rev [options] <commit>..."),
203 N_("git name-rev [options] --all"),
204 N_("git name-rev [options] --stdin"),
205 NULL
206};
207
208static void name_rev_line(char *p, struct name_ref_data *data)
209{
210 int forty = 0;
211 char *p_start;
212 for (p_start = p; *p; p++) {
213#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
214 if (!ishex(*p))
215 forty = 0;
216 else if (++forty == 40 &&
217 !ishex(*(p+1))) {
218 unsigned char sha1[40];
219 const char *name = NULL;
220 char c = *(p+1);
221 int p_len = p - p_start + 1;
222
223 forty = 0;
224
225 *(p+1) = 0;
226 if (!get_sha1(p - 39, sha1)) {
227 struct object *o =
228 lookup_object(sha1);
229 if (o)
230 name = get_rev_name(o);
231 }
232 *(p+1) = c;
233
234 if (!name)
235 continue;
236
237 if (data->name_only)
238 printf("%.*s%s", p_len - 40, p_start, name);
239 else
240 printf("%.*s (%s)", p_len, p_start, name);
241 p_start = p + 1;
242 }
243 }
244
245 /* flush */
246 if (p_start != p)
247 fwrite(p_start, p - p_start, 1, stdout);
248}
249
250int cmd_name_rev(int argc, const char **argv, const char *prefix)
251{
252 struct object_array revs = OBJECT_ARRAY_INIT;
253 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
254 struct name_ref_data data = { 0, 0, NULL };
255 struct option opts[] = {
256 OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
257 OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
258 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
259 N_("only use refs matching <pattern>")),
260 OPT_GROUP(""),
261 OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
262 OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
263 OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
264 OPT_BOOLEAN(0, "always", &always,
265 N_("show abbreviated commit object as fallback")),
266 OPT_END(),
267 };
268
269 git_config(git_default_config, NULL);
270 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
271 if (!!all + !!transform_stdin + !!argc > 1) {
272 error("Specify either a list, or --all, not both!");
273 usage_with_options(name_rev_usage, opts);
274 }
275 if (all || transform_stdin)
276 cutoff = 0;
277
278 for (; argc; argc--, argv++) {
279 unsigned char sha1[20];
280 struct object *o;
281 struct commit *commit;
282
283 if (get_sha1(*argv, sha1)) {
284 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
285 *argv);
286 continue;
287 }
288
289 o = deref_tag(parse_object(sha1), *argv, 0);
290 if (!o || o->type != OBJ_COMMIT) {
291 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
292 *argv);
293 continue;
294 }
295
296 commit = (struct commit *)o;
297 if (cutoff > commit->date)
298 cutoff = commit->date;
299 add_object_array((struct object *)commit, *argv, &revs);
300 }
301
302 if (cutoff)
303 cutoff = cutoff - CUTOFF_DATE_SLOP;
304 for_each_ref(name_ref, &data);
305
306 if (transform_stdin) {
307 char buffer[2048];
308
309 while (!feof(stdin)) {
310 char *p = fgets(buffer, sizeof(buffer), stdin);
311 if (!p)
312 break;
313 name_rev_line(p, &data);
314 }
315 } else if (all) {
316 int i, max;
317
318 max = get_max_object_index();
319 for (i = 0; i < max; i++) {
320 struct object *obj = get_indexed_object(i);
321 if (!obj || obj->type != OBJ_COMMIT)
322 continue;
323 show_name(obj, NULL,
324 always, allow_undefined, data.name_only);
325 }
326 } else {
327 int i;
328 for (i = 0; i < revs.nr; i++)
329 show_name(revs.objects[i].item, revs.objects[i].name,
330 always, allow_undefined, data.name_only);
331 }
332
333 return 0;
334}