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