sha1_name: add get_sha1_with_context()
[git/git.git] / builtin / cat-file.c
CommitLineData
8bc9a0c7
LT
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
e83c5163 6#include "cache.h"
a0f15fa5 7#include "exec_cmd.h"
8e440259
PE
8#include "tag.h"
9#include "tree.h"
f81daefe 10#include "builtin.h"
15d8e565
MB
11#include "parse-options.h"
12
13#define BATCH 1
14#define BATCH_CHECK 2
a0f15fa5 15
eddd1c8c 16static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
a0f15fa5
JH
17{
18 /* the parser in tag.c is useless here. */
19 const char *endp = buf + size;
20 const char *cp = buf;
21
22 while (cp < endp) {
23 char c = *cp++;
24 if (c != '\n')
25 continue;
26 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
27 const char *tagger = cp;
28
29 /* Found the tagger line. Copy out the contents
30 * of the buffer so far.
31 */
7230e6d0 32 write_or_die(1, buf, cp - buf);
a0f15fa5
JH
33
34 /*
35 * Do something intelligent, like pretty-printing
36 * the date.
37 */
38 while (cp < endp) {
39 if (*cp++ == '\n') {
40 /* tagger to cp is a line
41 * that has ident and time.
42 */
43 const char *sp = tagger;
44 char *ep;
45 unsigned long date;
46 long tz;
47 while (sp < cp && *sp != '>')
48 sp++;
49 if (sp == cp) {
50 /* give up */
7230e6d0 51 write_or_die(1, tagger,
a0f15fa5
JH
52 cp - tagger);
53 break;
54 }
55 while (sp < cp &&
56 !('0' <= *sp && *sp <= '9'))
57 sp++;
7230e6d0 58 write_or_die(1, tagger, sp - tagger);
a0f15fa5
JH
59 date = strtoul(sp, &ep, 10);
60 tz = strtol(ep, NULL, 10);
9a8e35e9 61 sp = show_date(date, tz, 0);
7230e6d0 62 write_or_die(1, sp, strlen(sp));
a0f15fa5
JH
63 xwrite(1, "\n", 1);
64 break;
65 }
66 }
67 break;
68 }
69 if (cp < endp && *cp == '\n')
70 /* end of header */
71 break;
72 }
73 /* At this point, we have copied out the header up to the end of
74 * the tagger line and cp points at one past \n. It could be the
75 * next header line after the tagger line, or it could be another
76 * \n that marks the end of the headers. We need to copy out the
77 * remainder as is.
78 */
79 if (cp < endp)
7230e6d0 80 write_or_die(1, cp, endp - cp);
a0f15fa5 81}
e83c5163 82
9cf71b17 83static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
e83c5163
LT
84{
85 unsigned char sha1[20];
21666f1a 86 enum object_type type;
e83c5163
LT
87 void *buf;
88 unsigned long size;
2b6854c8
SP
89
90 if (get_sha1(obj_name, sha1))
91 die("Not a valid object name %s", obj_name);
7950571a 92
7950571a
PA
93 buf = NULL;
94 switch (opt) {
95 case 't':
21666f1a
NP
96 type = sha1_object_info(sha1, NULL);
97 if (type > 0) {
98 printf("%s\n", typename(type));
f2a06330 99 return 0;
11e7d5c5 100 }
7950571a
PA
101 break;
102
103 case 's':
21666f1a
NP
104 type = sha1_object_info(sha1, &size);
105 if (type > 0) {
7950571a
PA
106 printf("%lu\n", size);
107 return 0;
108 }
109 break;
110
111 case 'e':
112 return !has_sha1_file(sha1);
113
a0f15fa5 114 case 'p':
21666f1a
NP
115 type = sha1_object_info(sha1, NULL);
116 if (type < 0)
2b6854c8 117 die("Not a valid object name %s", obj_name);
a0f15fa5
JH
118
119 /* custom pretty-print here */
2b6854c8
SP
120 if (type == OBJ_TREE) {
121 const char *ls_args[3] = {"ls-tree", obj_name, NULL};
122 return cmd_ls_tree(2, ls_args, NULL);
123 }
a0f15fa5 124
21666f1a 125 buf = read_sha1_file(sha1, &type, &size);
a0f15fa5 126 if (!buf)
2b6854c8 127 die("Cannot read object %s", obj_name);
21666f1a 128 if (type == OBJ_TAG) {
eddd1c8c
DR
129 pprint_tag(sha1, buf, size);
130 return 0;
131 }
a0f15fa5
JH
132
133 /* otherwise just spit out the data */
134 break;
7950571a 135 case 0:
2b6854c8 136 buf = read_object_with_reference(sha1, exp_type, &size, NULL);
7950571a
PA
137 break;
138
139 default:
d7530708 140 die("git cat-file: unknown option: %s", exp_type);
bf0c6e83
LT
141 }
142
11e7d5c5 143 if (!buf)
34baebce 144 die("git cat-file %s: bad file", obj_name);
11e7d5c5 145
7230e6d0 146 write_or_die(1, buf, size);
bf0c6e83 147 return 0;
e83c5163 148}
9cf71b17 149
a8128ed6 150static int batch_one_object(const char *obj_name, int print_contents)
05d5667f
AR
151{
152 unsigned char sha1[20];
3c076dbe 153 enum object_type type = 0;
05d5667f 154 unsigned long size;
a8128ed6 155 void *contents = contents;
05d5667f
AR
156
157 if (!obj_name)
158 return 1;
159
160 if (get_sha1(obj_name, sha1)) {
161 printf("%s missing\n", obj_name);
422b2063 162 fflush(stdout);
05d5667f
AR
163 return 0;
164 }
165
15d8e565 166 if (print_contents == BATCH)
a8128ed6
AR
167 contents = read_sha1_file(sha1, &type, &size);
168 else
169 type = sha1_object_info(sha1, &size);
170
3c076dbe
LW
171 if (type <= 0) {
172 printf("%s missing\n", obj_name);
173 fflush(stdout);
174 return 0;
175 }
05d5667f
AR
176
177 printf("%s %s %lu\n", sha1_to_hex(sha1), typename(type), size);
a8128ed6
AR
178 fflush(stdout);
179
15d8e565 180 if (print_contents == BATCH) {
a8128ed6
AR
181 write_or_die(1, contents, size);
182 printf("\n");
183 fflush(stdout);
5b8a94b1 184 free(contents);
a8128ed6 185 }
05d5667f
AR
186
187 return 0;
188}
189
a8128ed6 190static int batch_objects(int print_contents)
05d5667f 191{
f285a2d7 192 struct strbuf buf = STRBUF_INIT;
05d5667f 193
05d5667f 194 while (strbuf_getline(&buf, stdin, '\n') != EOF) {
a8128ed6 195 int error = batch_one_object(buf.buf, print_contents);
05d5667f
AR
196 if (error)
197 return error;
198 }
199
200 return 0;
201}
202
15d8e565 203static const char * const cat_file_usage[] = {
0e5168fd
JK
204 "git cat-file (-t|-s|-e|-p|<type>) <object>",
205 "git cat-file (--batch|--batch-check) < <list_of_objects>",
15d8e565
MB
206 NULL
207};
4814dbe8 208
9cf71b17
AR
209int cmd_cat_file(int argc, const char **argv, const char *prefix)
210{
15d8e565 211 int opt = 0, batch = 0;
4814dbe8 212 const char *exp_type = NULL, *obj_name = NULL;
9cf71b17 213
15d8e565
MB
214 const struct option options[] = {
215 OPT_GROUP("<type> can be one of: blob, tree, commit, tag"),
216 OPT_SET_INT('t', NULL, &opt, "show object type", 't'),
217 OPT_SET_INT('s', NULL, &opt, "show object size", 's'),
218 OPT_SET_INT('e', NULL, &opt,
219 "exit with zero when there's no error", 'e'),
220 OPT_SET_INT('p', NULL, &opt, "pretty-print object's content", 'p'),
221 OPT_SET_INT(0, "batch", &batch,
9517e6b8
JH
222 "show info and content of objects fed from the standard input",
223 BATCH),
15d8e565 224 OPT_SET_INT(0, "batch-check", &batch,
9517e6b8 225 "show info about objects fed from the standard input",
15d8e565
MB
226 BATCH_CHECK),
227 OPT_END()
228 };
a8128ed6 229
9bd81e42 230 git_config(git_default_config, NULL);
4814dbe8 231
15d8e565
MB
232 if (argc != 3 && argc != 2)
233 usage_with_options(cat_file_usage, options);
4814dbe8 234
37782920 235 argc = parse_options(argc, argv, prefix, options, cat_file_usage, 0);
05d5667f 236
15d8e565
MB
237 if (opt) {
238 if (argc == 1)
239 obj_name = argv[0];
240 else
241 usage_with_options(cat_file_usage, options);
242 }
243 if (!opt && !batch) {
244 if (argc == 2) {
245 exp_type = argv[0];
246 obj_name = argv[1];
247 } else
248 usage_with_options(cat_file_usage, options);
249 }
250 if (batch && (opt || argc)) {
251 usage_with_options(cat_file_usage, options);
9cf71b17
AR
252 }
253
15d8e565 254 if (batch)
a8128ed6 255 return batch_objects(batch);
05d5667f 256
9cf71b17
AR
257 return cat_one_file(opt, exp_type, obj_name);
258}