builtin/notes.c: mark file-scope private symbols as static
[git] / builtin / symbolic-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "parse-options.h"
5
6 static const char * const git_symbolic_ref_usage[] = {
7         N_("git symbolic-ref [options] name [ref]"),
8         NULL
9 };
10
11 static int shorten;
12
13 static void check_symref(const char *HEAD, int quiet)
14 {
15         unsigned char sha1[20];
16         int flag;
17         const char *refname = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
18
19         if (!refname)
20                 die("No such ref: %s", HEAD);
21         else if (!(flag & REF_ISSYMREF)) {
22                 if (!quiet)
23                         die("ref %s is not a symbolic ref", HEAD);
24                 else
25                         exit(1);
26         }
27         if (shorten)
28                 refname = shorten_unambiguous_ref(refname, 0);
29         puts(refname);
30 }
31
32 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
33 {
34         int quiet = 0;
35         const char *msg = NULL;
36         struct option options[] = {
37                 OPT__QUIET(&quiet,
38                         N_("suppress error message for non-symbolic (detached) refs")),
39                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
40                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
41                 OPT_END(),
42         };
43
44         git_config(git_default_config, NULL);
45         argc = parse_options(argc, argv, prefix, options,
46                              git_symbolic_ref_usage, 0);
47         if (msg &&!*msg)
48                 die("Refusing to perform update with empty message");
49         switch (argc) {
50         case 1:
51                 check_symref(argv[0], quiet);
52                 break;
53         case 2:
54                 if (!strcmp(argv[0], "HEAD") &&
55                     prefixcmp(argv[1], "refs/"))
56                         die("Refusing to point HEAD outside of refs/");
57                 create_symref(argv[0], argv[1], msg);
58                 break;
59         default:
60                 usage_with_options(git_symbolic_ref_usage, options);
61         }
62         return 0;
63 }