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