Merge branch 'nd/checkout-noisy-unmerge'
[git] / builtin / check-ref-format.c
1 /*
2  * GIT - The information manager from hell
3  */
4
5 #include "cache.h"
6 #include "refs.h"
7 #include "builtin.h"
8 #include "strbuf.h"
9
10 static const char builtin_check_ref_format_usage[] =
11 "git check-ref-format [--normalize] [<options>] <refname>\n"
12 "   or: git check-ref-format --branch <branchname-shorthand>";
13
14 /*
15  * Return a copy of refname but with leading slashes removed and runs
16  * of adjacent slashes replaced with single slashes.
17  *
18  * This function is similar to normalize_path_copy(), but stripped down
19  * to meet check_ref_format's simpler needs.
20  */
21 static char *collapse_slashes(const char *refname)
22 {
23         char *ret = xmallocz(strlen(refname));
24         char ch;
25         char prev = '/';
26         char *cp = ret;
27
28         while ((ch = *refname++) != '\0') {
29                 if (prev == '/' && ch == prev)
30                         continue;
31
32                 *cp++ = ch;
33                 prev = ch;
34         }
35         *cp = '\0';
36         return ret;
37 }
38
39 static int check_ref_format_branch(const char *arg)
40 {
41         struct strbuf sb = STRBUF_INIT;
42         const char *name;
43         int nongit;
44
45         setup_git_directory_gently(&nongit);
46         if (strbuf_check_branch_ref(&sb, arg) ||
47             !skip_prefix(sb.buf, "refs/heads/", &name))
48                 die("'%s' is not a valid branch name", arg);
49         printf("%s\n", name);
50         strbuf_release(&sb);
51         return 0;
52 }
53
54 int cmd_check_ref_format(int argc, const char **argv, const char *prefix)
55 {
56         int i;
57         int normalize = 0;
58         int flags = 0;
59         const char *refname;
60
61         if (argc == 2 && !strcmp(argv[1], "-h"))
62                 usage(builtin_check_ref_format_usage);
63
64         if (argc == 3 && !strcmp(argv[1], "--branch"))
65                 return check_ref_format_branch(argv[2]);
66
67         for (i = 1; i < argc && argv[i][0] == '-'; i++) {
68                 if (!strcmp(argv[i], "--normalize") || !strcmp(argv[i], "--print"))
69                         normalize = 1;
70                 else if (!strcmp(argv[i], "--allow-onelevel"))
71                         flags |= REFNAME_ALLOW_ONELEVEL;
72                 else if (!strcmp(argv[i], "--no-allow-onelevel"))
73                         flags &= ~REFNAME_ALLOW_ONELEVEL;
74                 else if (!strcmp(argv[i], "--refspec-pattern"))
75                         flags |= REFNAME_REFSPEC_PATTERN;
76                 else
77                         usage(builtin_check_ref_format_usage);
78         }
79         if (! (i == argc - 1))
80                 usage(builtin_check_ref_format_usage);
81
82         refname = argv[i];
83         if (normalize)
84                 refname = collapse_slashes(refname);
85         if (check_refname_format(refname, flags))
86                 return 1;
87         if (normalize)
88                 printf("%s\n", refname);
89
90         return 0;
91 }