Mark disused commit walkers officially deprecated.
[git] / builtin-symbolic-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4
5 static const char git_symbolic_ref_usage[] =
6 "git-symbolic-ref [-q] [-m <reason>] name [ref]";
7
8 static void check_symref(const char *HEAD, int quiet)
9 {
10         unsigned char sha1[20];
11         int flag;
12         const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
13
14         if (!refs_heads_master)
15                 die("No such ref: %s", HEAD);
16         else if (!(flag & REF_ISSYMREF)) {
17                 if (!quiet)
18                         die("ref %s is not a symbolic ref", HEAD);
19                 else
20                         exit(1);
21         }
22         puts(refs_heads_master);
23 }
24
25 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
26 {
27         int quiet = 0;
28         const char *msg = NULL;
29
30         git_config(git_default_config);
31
32         while (1 < argc) {
33                 const char *arg = argv[1];
34                 if (arg[0] != '-')
35                         break;
36                 else if (!strcmp("-q", arg))
37                         quiet = 1;
38                 else if (!strcmp("-m", arg)) {
39                         argc--;
40                         argv++;
41                         if (argc <= 1)
42                                 break;
43                         msg = argv[1];
44                         if (!*msg)
45                                 die("Refusing to perform update with empty message");
46                         if (strchr(msg, '\n'))
47                                 die("Refusing to perform update with \\n in message");
48                 }
49                 else if (!strcmp("--", arg)) {
50                         argc--;
51                         argv++;
52                         break;
53                 }
54                 else
55                         die("unknown option %s", arg);
56                 argc--;
57                 argv++;
58         }
59
60         switch (argc) {
61         case 2:
62                 check_symref(argv[1], quiet);
63                 break;
64         case 3:
65                 create_symref(argv[1], argv[2], msg);
66                 break;
67         default:
68                 usage(git_symbolic_ref_usage);
69         }
70         return 0;
71 }