Add prefixcmp()
[git/git.git] / builtin-show-ref.c
CommitLineData
358ddb62
LT
1#include "cache.h"
2#include "refs.h"
3#include "object.h"
4#include "tag.h"
ed9f7c95 5#include "path-list.h"
358ddb62 6
d8285af4 7static 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";
358ddb62 8
c40abef8 9static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
2eaf2224 10 found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
358ddb62
LT
11static const char **pattern;
12
64fe031a
JH
13static 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
eaf12a8c 22static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
358ddb62
LT
23{
24 struct object *obj;
2eaf2224 25 const char *hex;
cf0adba7 26 unsigned char peeled[20];
358ddb62
LT
27
28 if (tags_only || heads_only) {
29 int match;
30
31 match = heads_only && !strncmp(refname, "refs/heads/", 11);
32 match |= tags_only && !strncmp(refname, "refs/tags/", 10);
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
56match:
57 found_match++;
cf0adba7
JH
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
358ddb62
LT
67 if (quiet)
68 return 0;
2eaf2224 69
64fe031a 70 show_one(refname, sha1);
cf0adba7
JH
71
72 if (!deref_tags)
73 return 0;
74
75 if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
f4204ab9
JH
76 if (!is_null_sha1(peeled)) {
77 hex = find_unique_abbrev(peeled, abbrev);
78 printf("%s %s^{}\n", hex, refname);
79 }
358ddb62 80 }
cf0adba7
JH
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 }
358ddb62
LT
92 return 0;
93}
94
ed9f7c95
JH
95static 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 */
111static 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)) {
ed9f7c95 119 char *ref;
d8285af4
JH
120 int len = strlen(buf);
121
ed9f7c95
JH
122 if (len > 0 && buf[len - 1] == '\n')
123 buf[--len] = '\0';
d8285af4 124 if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
ed9f7c95
JH
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
358ddb62
LT
149int 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 }
c40abef8
CC
177 if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
178 hash_only = 1;
179 continue;
180 }
2eaf2224
JH
181 if (!strncmp(arg, "--hash=", 7) ||
182 (!strncmp(arg, "--abbrev", 8) &&
183 (arg[8] == '=' || arg[8] == '\0'))) {
64fe031a 184 if (arg[2] != 'h' && !arg[8])
2eaf2224
JH
185 /* --abbrev only */
186 abbrev = DEFAULT_ABBREV;
187 else {
188 /* --hash= or --abbrev= */
189 char *end;
64fe031a 190 if (arg[2] == 'h') {
2eaf2224
JH
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 }
358ddb62
LT
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 }
ed9f7c95
JH
216 if (!strcmp(arg, "--exclude-existing"))
217 return exclude_existing(NULL);
218 if (!strncmp(arg, "--exclude-existing=", 19))
219 return exclude_existing(arg + 19);
358ddb62
LT
220 usage(show_ref_usage);
221 }
26cdd1e7
JH
222
223 if (verify) {
224 unsigned char sha1[20];
225
226 while (*pattern) {
64fe031a
JH
227 if (!strncmp(*pattern, "refs/", 5) &&
228 resolve_ref(*pattern, sha1, 1, NULL)) {
dd914299 229 if (!quiet)
64fe031a 230 show_one(*pattern, sha1);
dd914299 231 }
26cdd1e7
JH
232 else if (!quiet)
233 die("'%s' - not a valid ref", *pattern);
234 else
235 return 1;
236 pattern++;
237 }
238 return 0;
239 }
240
358ddb62 241 if (show_head)
eaf12a8c
JH
242 head_ref(show_ref, NULL);
243 for_each_ref(show_ref, NULL);
358ddb62
LT
244 if (!found_match) {
245 if (verify && !quiet)
246 die("No match");
247 return 1;
248 }
249 return 0;
250}