Switch to run_command_v_opt in revert
[git] / builtin-show-ref.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "object.h"
4 #include "tag.h"
5 #include "path-list.h"
6
7 static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] < ref-list";
8
9 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
10         found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
11 static const char **pattern;
12
13 static void show_one(const char *refname, const unsigned char *sha1)
14 {
15         const char *hex = find_unique_abbrev(sha1, abbrev);
16         if (hash_only)
17                 printf("%s\n", hex);
18         else
19                 printf("%s %s\n", hex, refname);
20 }
21
22 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
23 {
24         struct object *obj;
25         const char *hex;
26         unsigned char peeled[20];
27
28         if (tags_only || heads_only) {
29                 int match;
30
31                 match = heads_only && !prefixcmp(refname, "refs/heads/");
32                 match |= tags_only && !prefixcmp(refname, "refs/tags/");
33                 if (!match)
34                         return 0;
35         }
36         if (pattern) {
37                 int reflen = strlen(refname);
38                 const char **p = pattern, *m;
39                 while ((m = *p++) != NULL) {
40                         int len = strlen(m);
41                         if (len > reflen)
42                                 continue;
43                         if (memcmp(m, refname + reflen - len, len))
44                                 continue;
45                         if (len == reflen)
46                                 goto match;
47                         /* "--verify" requires an exact match */
48                         if (verify)
49                                 continue;
50                         if (refname[reflen - len - 1] == '/')
51                                 goto match;
52                 }
53                 return 0;
54         }
55
56 match:
57         found_match++;
58
59         /* This changes the semantics slightly that even under quiet we
60          * detect and return error if the repository is corrupt and
61          * ref points at a nonexistent object.
62          */
63         if (!has_sha1_file(sha1))
64                 die("git-show-ref: bad ref %s (%s)", refname,
65                     sha1_to_hex(sha1));
66
67         if (quiet)
68                 return 0;
69
70         show_one(refname, sha1);
71
72         if (!deref_tags)
73                 return 0;
74
75         if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
76                 if (!is_null_sha1(peeled)) {
77                         hex = find_unique_abbrev(peeled, abbrev);
78                         printf("%s %s^{}\n", hex, refname);
79                 }
80         }
81         else {
82                 obj = parse_object(sha1);
83                 if (!obj)
84                         die("git-show-ref: bad ref %s (%s)", refname,
85                             sha1_to_hex(sha1));
86                 if (obj->type == OBJ_TAG) {
87                         obj = deref_tag(obj, refname, 0);
88                         hex = find_unique_abbrev(obj->sha1, abbrev);
89                         printf("%s %s^{}\n", hex, refname);
90                 }
91         }
92         return 0;
93 }
94
95 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
96 {
97         struct path_list *list = (struct path_list *)cbdata;
98         path_list_insert(refname, list);
99         return 0;
100 }
101
102 /*
103  * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
104  * and
105  * (1) strip "^{}" at the end of line if any;
106  * (2) ignore if match is provided and does not head-match refname;
107  * (3) warn if refname is not a well-formed refname and skip;
108  * (4) ignore if refname is a ref that exists in the local repository;
109  * (5) otherwise output the line.
110  */
111 static int exclude_existing(const char *match)
112 {
113         static struct path_list existing_refs = { NULL, 0, 0, 0 };
114         char buf[1024];
115         int matchlen = match ? strlen(match) : 0;
116
117         for_each_ref(add_existing, &existing_refs);
118         while (fgets(buf, sizeof(buf), stdin)) {
119                 char *ref;
120                 int len = strlen(buf);
121
122                 if (len > 0 && buf[len - 1] == '\n')
123                         buf[--len] = '\0';
124                 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
125                         len -= 3;
126                         buf[len] = '\0';
127                 }
128                 for (ref = buf + len; buf < ref; ref--)
129                         if (isspace(ref[-1]))
130                                 break;
131                 if (match) {
132                         int reflen = buf + len - ref;
133                         if (reflen < matchlen)
134                                 continue;
135                         if (strncmp(ref, match, matchlen))
136                                 continue;
137                 }
138                 if (check_ref_format(ref)) {
139                         fprintf(stderr, "warning: ref '%s' ignored\n", ref);
140                         continue;
141                 }
142                 if (!path_list_has_path(&existing_refs, ref)) {
143                         printf("%s\n", buf);
144                 }
145         }
146         return 0;
147 }
148
149 int cmd_show_ref(int argc, const char **argv, const char *prefix)
150 {
151         int i;
152
153         for (i = 1; i < argc; i++) {
154                 const char *arg = argv[i];
155                 if (*arg != '-') {
156                         pattern = argv + i;
157                         break;
158                 }
159                 if (!strcmp(arg, "--")) {
160                         pattern = argv + i + 1;
161                         if (!*pattern)
162                                 pattern = NULL;
163                         break;
164                 }
165                 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
166                         quiet = 1;
167                         continue;
168                 }
169                 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
170                         show_head = 1;
171                         continue;
172                 }
173                 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
174                         deref_tags = 1;
175                         continue;
176                 }
177                 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
178                         hash_only = 1;
179                         continue;
180                 }
181                 if (!prefixcmp(arg, "--hash=") ||
182                     (!prefixcmp(arg, "--abbrev") &&
183                      (arg[8] == '=' || arg[8] == '\0'))) {
184                         if (arg[2] != 'h' && !arg[8])
185                                 /* --abbrev only */
186                                 abbrev = DEFAULT_ABBREV;
187                         else {
188                                 /* --hash= or --abbrev= */
189                                 char *end;
190                                 if (arg[2] == 'h') {
191                                         hash_only = 1;
192                                         arg += 7;
193                                 }
194                                 else
195                                         arg += 9;
196                                 abbrev = strtoul(arg, &end, 10);
197                                 if (*end || abbrev > 40)
198                                         usage(show_ref_usage);
199                                 if (abbrev < MINIMUM_ABBREV)
200                                         abbrev = MINIMUM_ABBREV;
201                         }
202                         continue;
203                 }
204                 if (!strcmp(arg, "--verify")) {
205                         verify = 1;
206                         continue;
207                 }
208                 if (!strcmp(arg, "--tags")) {
209                         tags_only = 1;
210                         continue;
211                 }
212                 if (!strcmp(arg, "--heads")) {
213                         heads_only = 1;
214                         continue;
215                 }
216                 if (!strcmp(arg, "--exclude-existing"))
217                         return exclude_existing(NULL);
218                 if (!prefixcmp(arg, "--exclude-existing="))
219                         return exclude_existing(arg + 19);
220                 usage(show_ref_usage);
221         }
222
223         if (verify) {
224                 if (!pattern)
225                         die("--verify requires a reference");
226                 while (*pattern) {
227                         unsigned char sha1[20];
228
229                         if (!prefixcmp(*pattern, "refs/") &&
230                             resolve_ref(*pattern, sha1, 1, NULL)) {
231                                 if (!quiet)
232                                         show_one(*pattern, sha1);
233                         }
234                         else if (!quiet)
235                                 die("'%s' - not a valid ref", *pattern);
236                         else
237                                 return 1;
238                         pattern++;
239                 }
240                 return 0;
241         }
242
243         if (show_head)
244                 head_ref(show_ref, NULL);
245         for_each_ref(show_ref, NULL);
246         if (!found_match) {
247                 if (verify && !quiet)
248                         die("No match");
249                 return 1;
250         }
251         return 0;
252 }