gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / builtin-show-ref.c
blobadd16004f11375b1ad2b97f9b1bf1ced5c437f81
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"
8 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";
10 static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
11 found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
12 static const char **pattern;
14 static void show_one(const char *refname, const unsigned char *sha1)
16 const char *hex = find_unique_abbrev(sha1, abbrev);
17 if (hash_only)
18 printf("%s\n", hex);
19 else
20 printf("%s %s\n", hex, refname);
23 static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
25 struct object *obj;
26 const char *hex;
27 unsigned char peeled[20];
29 if (tags_only || heads_only) {
30 int match;
32 match = heads_only && !prefixcmp(refname, "refs/heads/");
33 match |= tags_only && !prefixcmp(refname, "refs/tags/");
34 if (!match)
35 return 0;
37 if (pattern) {
38 int reflen = strlen(refname);
39 const char **p = pattern, *m;
40 while ((m = *p++) != NULL) {
41 int len = strlen(m);
42 if (len > reflen)
43 continue;
44 if (memcmp(m, refname + reflen - len, len))
45 continue;
46 if (len == reflen)
47 goto match;
48 /* "--verify" requires an exact match */
49 if (verify)
50 continue;
51 if (refname[reflen - len - 1] == '/')
52 goto match;
54 return 0;
57 match:
58 found_match++;
60 /* This changes the semantics slightly that even under quiet we
61 * detect and return error if the repository is corrupt and
62 * ref points at a nonexistent object.
64 if (!has_sha1_file(sha1))
65 die("git-show-ref: bad ref %s (%s)", refname,
66 sha1_to_hex(sha1));
68 if (quiet)
69 return 0;
71 show_one(refname, sha1);
73 if (!deref_tags)
74 return 0;
76 if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
77 if (!is_null_sha1(peeled)) {
78 hex = find_unique_abbrev(peeled, abbrev);
79 printf("%s %s^{}\n", hex, refname);
82 else {
83 obj = parse_object(sha1);
84 if (!obj)
85 die("git-show-ref: bad ref %s (%s)", refname,
86 sha1_to_hex(sha1));
87 if (obj->type == OBJ_TAG) {
88 obj = deref_tag(obj, refname, 0);
89 if (!obj)
90 die("git-show-ref: bad tag at ref %s (%s)", refname,
91 sha1_to_hex(sha1));
92 hex = find_unique_abbrev(obj->sha1, abbrev);
93 printf("%s %s^{}\n", hex, refname);
96 return 0;
99 static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
101 struct string_list *list = (struct string_list *)cbdata;
102 string_list_insert(refname, list);
103 return 0;
107 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
108 * and
109 * (1) strip "^{}" at the end of line if any;
110 * (2) ignore if match is provided and does not head-match refname;
111 * (3) warn if refname is not a well-formed refname and skip;
112 * (4) ignore if refname is a ref that exists in the local repository;
113 * (5) otherwise output the line.
115 static int exclude_existing(const char *match)
117 static struct string_list existing_refs = { NULL, 0, 0, 0 };
118 char buf[1024];
119 int matchlen = match ? strlen(match) : 0;
121 for_each_ref(add_existing, &existing_refs);
122 while (fgets(buf, sizeof(buf), stdin)) {
123 char *ref;
124 int len = strlen(buf);
126 if (len > 0 && buf[len - 1] == '\n')
127 buf[--len] = '\0';
128 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
129 len -= 3;
130 buf[len] = '\0';
132 for (ref = buf + len; buf < ref; ref--)
133 if (isspace(ref[-1]))
134 break;
135 if (match) {
136 int reflen = buf + len - ref;
137 if (reflen < matchlen)
138 continue;
139 if (strncmp(ref, match, matchlen))
140 continue;
142 if (check_ref_format(ref)) {
143 fprintf(stderr, "warning: ref '%s' ignored\n", ref);
144 continue;
146 if (!string_list_has_string(&existing_refs, ref)) {
147 printf("%s\n", buf);
150 return 0;
153 int cmd_show_ref(int argc, const char **argv, const char *prefix)
155 int i;
157 for (i = 1; i < argc; i++) {
158 const char *arg = argv[i];
159 if (*arg != '-') {
160 pattern = argv + i;
161 break;
163 if (!strcmp(arg, "--")) {
164 pattern = argv + i + 1;
165 if (!*pattern)
166 pattern = NULL;
167 break;
169 if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
170 quiet = 1;
171 continue;
173 if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
174 show_head = 1;
175 continue;
177 if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
178 deref_tags = 1;
179 continue;
181 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
182 hash_only = 1;
183 continue;
185 if (!prefixcmp(arg, "--hash=") ||
186 (!prefixcmp(arg, "--abbrev") &&
187 (arg[8] == '=' || arg[8] == '\0'))) {
188 if (arg[2] != 'h' && !arg[8])
189 /* --abbrev only */
190 abbrev = DEFAULT_ABBREV;
191 else {
192 /* --hash= or --abbrev= */
193 char *end;
194 if (arg[2] == 'h') {
195 hash_only = 1;
196 arg += 7;
198 else
199 arg += 9;
200 abbrev = strtoul(arg, &end, 10);
201 if (*end || abbrev > 40)
202 usage(show_ref_usage);
203 if (abbrev < MINIMUM_ABBREV)
204 abbrev = MINIMUM_ABBREV;
206 continue;
208 if (!strcmp(arg, "--verify")) {
209 verify = 1;
210 continue;
212 if (!strcmp(arg, "--tags")) {
213 tags_only = 1;
214 continue;
216 if (!strcmp(arg, "--heads")) {
217 heads_only = 1;
218 continue;
220 if (!strcmp(arg, "--exclude-existing"))
221 return exclude_existing(NULL);
222 if (!prefixcmp(arg, "--exclude-existing="))
223 return exclude_existing(arg + 19);
224 usage(show_ref_usage);
227 if (verify) {
228 if (!pattern)
229 die("--verify requires a reference");
230 while (*pattern) {
231 unsigned char sha1[20];
233 if (!prefixcmp(*pattern, "refs/") &&
234 resolve_ref(*pattern, sha1, 1, NULL)) {
235 if (!quiet)
236 show_one(*pattern, sha1);
238 else if (!quiet)
239 die("'%s' - not a valid ref", *pattern);
240 else
241 return 1;
242 pattern++;
244 return 0;
247 if (show_head)
248 head_ref(show_ref, NULL);
249 for_each_ref(show_ref, NULL);
250 if (!found_match) {
251 if (verify && !quiet)
252 die("No match");
253 return 1;
255 return 0;