Merge branch 'bc/sha-256-part-2'
[git] / builtin / show-ref.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "config.h"
4 #include "refs.h"
5 #include "object-store.h"
6 #include "object.h"
7 #include "tag.h"
8 #include "string-list.h"
9 #include "parse-options.h"
10
11 static const char * const show_ref_usage[] = {
12         N_("git show-ref [-q | --quiet] [--verify] [--head] [-d | --dereference] [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [<pattern>...]"),
13         N_("git show-ref --exclude-existing[=<pattern>]"),
14         NULL
15 };
16
17 static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
18            quiet, hash_only, abbrev, exclude_arg;
19 static const char **pattern;
20 static const char *exclude_existing_arg;
21
22 static void show_one(const char *refname, const struct object_id *oid)
23 {
24         const char *hex;
25         struct object_id peeled;
26
27         if (!has_object_file(oid))
28                 die("git show-ref: bad ref %s (%s)", refname,
29                     oid_to_hex(oid));
30
31         if (quiet)
32                 return;
33
34         hex = find_unique_abbrev(oid, abbrev);
35         if (hash_only)
36                 printf("%s\n", hex);
37         else
38                 printf("%s %s\n", hex, refname);
39
40         if (!deref_tags)
41                 return;
42
43         if (!peel_ref(refname, &peeled)) {
44                 hex = find_unique_abbrev(&peeled, abbrev);
45                 printf("%s %s^{}\n", hex, refname);
46         }
47 }
48
49 static int show_ref(const char *refname, const struct object_id *oid,
50                     int flag, void *cbdata)
51 {
52         if (show_head && !strcmp(refname, "HEAD"))
53                 goto match;
54
55         if (tags_only || heads_only) {
56                 int match;
57
58                 match = heads_only && starts_with(refname, "refs/heads/");
59                 match |= tags_only && starts_with(refname, "refs/tags/");
60                 if (!match)
61                         return 0;
62         }
63         if (pattern) {
64                 int reflen = strlen(refname);
65                 const char **p = pattern, *m;
66                 while ((m = *p++) != NULL) {
67                         int len = strlen(m);
68                         if (len > reflen)
69                                 continue;
70                         if (memcmp(m, refname + reflen - len, len))
71                                 continue;
72                         if (len == reflen)
73                                 goto match;
74                         if (refname[reflen - len - 1] == '/')
75                                 goto match;
76                 }
77                 return 0;
78         }
79
80 match:
81         found_match++;
82
83         show_one(refname, oid);
84
85         return 0;
86 }
87
88 static int add_existing(const char *refname, const struct object_id *oid,
89                         int flag, void *cbdata)
90 {
91         struct string_list *list = (struct string_list *)cbdata;
92         string_list_insert(list, refname);
93         return 0;
94 }
95
96 /*
97  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
98  * and
99  * (1) strip "^{}" at the end of line if any;
100  * (2) ignore if match is provided and does not head-match refname;
101  * (3) warn if refname is not a well-formed refname and skip;
102  * (4) ignore if refname is a ref that exists in the local repository;
103  * (5) otherwise output the line.
104  */
105 static int exclude_existing(const char *match)
106 {
107         static struct string_list existing_refs = STRING_LIST_INIT_DUP;
108         char buf[1024];
109         int matchlen = match ? strlen(match) : 0;
110
111         for_each_ref(add_existing, &existing_refs);
112         while (fgets(buf, sizeof(buf), stdin)) {
113                 char *ref;
114                 int len = strlen(buf);
115
116                 if (len > 0 && buf[len - 1] == '\n')
117                         buf[--len] = '\0';
118                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
119                         len -= 3;
120                         buf[len] = '\0';
121                 }
122                 for (ref = buf + len; buf < ref; ref--)
123                         if (isspace(ref[-1]))
124                                 break;
125                 if (match) {
126                         int reflen = buf + len - ref;
127                         if (reflen < matchlen)
128                                 continue;
129                         if (strncmp(ref, match, matchlen))
130                                 continue;
131                 }
132                 if (check_refname_format(ref, 0)) {
133                         warning("ref '%s' ignored", ref);
134                         continue;
135                 }
136                 if (!string_list_has_string(&existing_refs, ref)) {
137                         printf("%s\n", buf);
138                 }
139         }
140         return 0;
141 }
142
143 static int hash_callback(const struct option *opt, const char *arg, int unset)
144 {
145         hash_only = 1;
146         /* Use full length SHA1 if no argument */
147         if (!arg)
148                 return 0;
149         return parse_opt_abbrev_cb(opt, arg, unset);
150 }
151
152 static int exclude_existing_callback(const struct option *opt, const char *arg,
153                                      int unset)
154 {
155         BUG_ON_OPT_NEG(unset);
156         exclude_arg = 1;
157         *(const char **)opt->value = arg;
158         return 0;
159 }
160
161 static const struct option show_ref_options[] = {
162         OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
163         OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
164         OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
165                     "requires exact ref path")),
166         OPT_HIDDEN_BOOL('h', NULL, &show_head,
167                         N_("show the HEAD reference, even if it would be filtered out")),
168         OPT_BOOL(0, "head", &show_head,
169           N_("show the HEAD reference, even if it would be filtered out")),
170         OPT_BOOL('d', "dereference", &deref_tags,
171                     N_("dereference tags into object IDs")),
172         OPT_CALLBACK_F('s', "hash", &abbrev, N_("n"),
173                        N_("only show SHA1 hash using <n> digits"),
174                        PARSE_OPT_OPTARG, &hash_callback),
175         OPT__ABBREV(&abbrev),
176         OPT__QUIET(&quiet,
177                    N_("do not print results to stdout (useful with --verify)")),
178         OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_arg,
179                        N_("pattern"), N_("show refs from stdin that aren't in local repository"),
180                        PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback),
181         OPT_END()
182 };
183
184 int cmd_show_ref(int argc, const char **argv, const char *prefix)
185 {
186         git_config(git_default_config, NULL);
187
188         argc = parse_options(argc, argv, prefix, show_ref_options,
189                              show_ref_usage, 0);
190
191         if (exclude_arg)
192                 return exclude_existing(exclude_existing_arg);
193
194         pattern = argv;
195         if (!*pattern)
196                 pattern = NULL;
197
198         if (verify) {
199                 if (!pattern)
200                         die("--verify requires a reference");
201                 while (*pattern) {
202                         struct object_id oid;
203
204                         if ((starts_with(*pattern, "refs/") || !strcmp(*pattern, "HEAD")) &&
205                             !read_ref(*pattern, &oid)) {
206                                 show_one(*pattern, &oid);
207                         }
208                         else if (!quiet)
209                                 die("'%s' - not a valid ref", *pattern);
210                         else
211                                 return 1;
212                         pattern++;
213                 }
214                 return 0;
215         }
216
217         if (show_head)
218                 head_ref(show_ref, NULL);
219         for_each_ref(show_ref, NULL);
220         if (!found_match) {
221                 if (verify && !quiet)
222                         die("No match");
223                 return 1;
224         }
225         return 0;
226 }