Merge branch 'th/diff-extra'
[git] / builtin-symbolic-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3
4 static const char git_symbolic_ref_usage[] =
5 "git-symbolic-ref name [ref]";
6
7 static void check_symref(const char *HEAD)
8 {
9         unsigned char sha1[20];
10         const char *git_HEAD = strdup(git_path("%s", HEAD));
11         const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 0);
12         if (git_refs_heads_master) {
13                 /* we want to strip the .git/ part */
14                 int pfxlen = strlen(git_HEAD) - strlen(HEAD);
15                 puts(git_refs_heads_master + pfxlen);
16         }
17         else
18                 die("No such ref: %s", HEAD);
19 }
20
21 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
22 {
23         git_config(git_default_config);
24         switch (argc) {
25         case 2:
26                 check_symref(argv[1]);
27                 break;
28         case 3:
29                 create_symref(strdup(git_path("%s", argv[1])), argv[2]);
30                 break;
31         default:
32                 usage(git_symbolic_ref_usage);
33         }
34         return 0;
35 }