Merge branch 'mm/status-push-pull-advise'
[git] / builtin / show-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "refs.h"
4 #include "object.h"
5 #include "tag.h"
6 #include "string-list.h"
7 #include "parse-options.h"
8
9 static const char * const show_ref_usage[] = {
10         N_("git show-ref [-q|--quiet] [--verify] [--head] [-d|--dereference] [-s|--hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [pattern*] "),
11         N_("git show-ref --exclude-existing[=pattern] < ref-list"),
12         NULL
13 };
14
15 static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
16            quiet, hash_only, abbrev, exclude_arg;
17 static const char **pattern;
18 static const char *exclude_existing_arg;
19
20 static void show_one(const char *refname, const unsigned char *sha1)
21 {
22         const char *hex = find_unique_abbrev(sha1, abbrev);
23         if (hash_only)
24                 printf("%s\n", hex);
25         else
26                 printf("%s %s\n", hex, refname);
27 }
28
29 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
30 {
31         const char *hex;
32         unsigned char peeled[20];
33
34         if (tags_only || heads_only) {
35                 int match;
36
37                 match = heads_only && !prefixcmp(refname, "refs/heads/");
38                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
39                 if (!match)
40                         return 0;
41         }
42         if (pattern) {
43                 int reflen = strlen(refname);
44                 const char **p = pattern, *m;
45                 while ((m = *p++) != NULL) {
46                         int len = strlen(m);
47                         if (len > reflen)
48                                 continue;
49                         if (memcmp(m, refname + reflen - len, len))
50                                 continue;
51                         if (len == reflen)
52                                 goto match;
53                         /* "--verify" requires an exact match */
54                         if (verify)
55                                 continue;
56                         if (refname[reflen - len - 1] == '/')
57                                 goto match;
58                 }
59                 return 0;
60         }
61
62 match:
63         found_match++;
64
65         /* This changes the semantics slightly that even under quiet we
66          * detect and return error if the repository is corrupt and
67          * ref points at a nonexistent object.
68          */
69         if (!has_sha1_file(sha1))
70                 die("git show-ref: bad ref %s (%s)", refname,
71                     sha1_to_hex(sha1));
72
73         if (quiet)
74                 return 0;
75
76         show_one(refname, sha1);
77
78         if (!deref_tags)
79                 return 0;
80
81         if (!peel_ref(refname, peeled)) {
82                 hex = find_unique_abbrev(peeled, abbrev);
83                 printf("%s %s^{}\n", hex, refname);
84         }
85         return 0;
86 }
87
88 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
89 {
90         struct string_list *list = (struct string_list *)cbdata;
91         string_list_insert(list, refname);
92         return 0;
93 }
94
95 /*
96  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
97  * and
98  * (1) strip "^{}" at the end of line if any;
99  * (2) ignore if match is provided and does not head-match refname;
100  * (3) warn if refname is not a well-formed refname and skip;
101  * (4) ignore if refname is a ref that exists in the local repository;
102  * (5) otherwise output the line.
103  */
104 static int exclude_existing(const char *match)
105 {
106         static struct string_list existing_refs = STRING_LIST_INIT_NODUP;
107         char buf[1024];
108         int matchlen = match ? strlen(match) : 0;
109
110         for_each_ref(add_existing, &existing_refs);
111         while (fgets(buf, sizeof(buf), stdin)) {
112                 char *ref;
113                 int len = strlen(buf);
114
115                 if (len > 0 && buf[len - 1] == '\n')
116                         buf[--len] = '\0';
117                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
118                         len -= 3;
119                         buf[len] = '\0';
120                 }
121                 for (ref = buf + len; buf < ref; ref--)
122                         if (isspace(ref[-1]))
123                                 break;
124                 if (match) {
125                         int reflen = buf + len - ref;
126                         if (reflen < matchlen)
127                                 continue;
128                         if (strncmp(ref, match, matchlen))
129                                 continue;
130                 }
131                 if (check_refname_format(ref, 0)) {
132                         warning("ref '%s' ignored", ref);
133                         continue;
134                 }
135                 if (!string_list_has_string(&existing_refs, ref)) {
136                         printf("%s\n", buf);
137                 }
138         }
139         return 0;
140 }
141
142 static int hash_callback(const struct option *opt, const char *arg, int unset)
143 {
144         hash_only = 1;
145         /* Use full length SHA1 if no argument */
146         if (!arg)
147                 return 0;
148         return parse_opt_abbrev_cb(opt, arg, unset);
149 }
150
151 static int exclude_existing_callback(const struct option *opt, const char *arg,
152                                      int unset)
153 {
154         exclude_arg = 1;
155         *(const char **)opt->value = arg;
156         return 0;
157 }
158
159 static int help_callback(const struct option *opt, const char *arg, int unset)
160 {
161         return -1;
162 }
163
164 static const struct option show_ref_options[] = {
165         OPT_BOOLEAN(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
166         OPT_BOOLEAN(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
167         OPT_BOOLEAN(0, "verify", &verify, N_("stricter reference checking, "
168                     "requires exact ref path")),
169         { OPTION_BOOLEAN, 'h', NULL, &show_head, NULL,
170           N_("show the HEAD reference"),
171           PARSE_OPT_NOARG | PARSE_OPT_HIDDEN },
172         OPT_BOOLEAN(0, "head", &show_head, N_("show the HEAD reference")),
173         OPT_BOOLEAN('d', "dereference", &deref_tags,
174                     N_("dereference tags into object IDs")),
175         { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
176           N_("only show SHA1 hash using <n> digits"),
177           PARSE_OPT_OPTARG, &hash_callback },
178         OPT__ABBREV(&abbrev),
179         OPT__QUIET(&quiet,
180                    N_("do not print results to stdout (useful with --verify)")),
181         { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
182           N_("pattern"), N_("show refs from stdin that aren't in local repository"),
183           PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
184         { OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
185           PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
186         OPT_END()
187 };
188
189 int cmd_show_ref(int argc, const char **argv, const char *prefix)
190 {
191         if (argc == 2 && !strcmp(argv[1], "-h"))
192                 usage_with_options(show_ref_usage, show_ref_options);
193
194         argc = parse_options(argc, argv, prefix, show_ref_options,
195                              show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
196
197         if (exclude_arg)
198                 return exclude_existing(exclude_existing_arg);
199
200         pattern = argv;
201         if (!*pattern)
202                 pattern = NULL;
203
204         if (verify) {
205                 if (!pattern)
206                         die("--verify requires a reference");
207                 while (*pattern) {
208                         unsigned char sha1[20];
209
210                         if (!prefixcmp(*pattern, "refs/") &&
211                             !read_ref(*pattern, sha1)) {
212                                 if (!quiet)
213                                         show_one(*pattern, sha1);
214                         }
215                         else if (!quiet)
216                                 die("'%s' - not a valid ref", *pattern);
217                         else
218                                 return 1;
219                         pattern++;
220                 }
221                 return 0;
222         }
223
224         if (show_head)
225                 head_ref(show_ref, NULL);
226         for_each_ref(show_ref, NULL);
227         if (!found_match) {
228                 if (verify && !quiet)
229                         die("No match");
230                 return 1;
231         }
232         return 0;
233 }