formalize typename(), and add its reverse type_from_string()
[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"
a0f15fa5 11
eddd1c8c 12static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
a0f15fa5
JH
13{
14 /* the parser in tag.c is useless here. */
15 const char *endp = buf + size;
16 const char *cp = buf;
17
18 while (cp < endp) {
19 char c = *cp++;
20 if (c != '\n')
21 continue;
22 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
23 const char *tagger = cp;
24
25 /* Found the tagger line. Copy out the contents
26 * of the buffer so far.
27 */
7230e6d0 28 write_or_die(1, buf, cp - buf);
a0f15fa5
JH
29
30 /*
31 * Do something intelligent, like pretty-printing
32 * the date.
33 */
34 while (cp < endp) {
35 if (*cp++ == '\n') {
36 /* tagger to cp is a line
37 * that has ident and time.
38 */
39 const char *sp = tagger;
40 char *ep;
41 unsigned long date;
42 long tz;
43 while (sp < cp && *sp != '>')
44 sp++;
45 if (sp == cp) {
46 /* give up */
7230e6d0 47 write_or_die(1, tagger,
a0f15fa5
JH
48 cp - tagger);
49 break;
50 }
51 while (sp < cp &&
52 !('0' <= *sp && *sp <= '9'))
53 sp++;
7230e6d0 54 write_or_die(1, tagger, sp - tagger);
a0f15fa5
JH
55 date = strtoul(sp, &ep, 10);
56 tz = strtol(ep, NULL, 10);
9a8e35e9 57 sp = show_date(date, tz, 0);
7230e6d0 58 write_or_die(1, sp, strlen(sp));
a0f15fa5
JH
59 xwrite(1, "\n", 1);
60 break;
61 }
62 }
63 break;
64 }
65 if (cp < endp && *cp == '\n')
66 /* end of header */
67 break;
68 }
69 /* At this point, we have copied out the header up to the end of
70 * the tagger line and cp points at one past \n. It could be the
71 * next header line after the tagger line, or it could be another
72 * \n that marks the end of the headers. We need to copy out the
73 * remainder as is.
74 */
75 if (cp < endp)
7230e6d0 76 write_or_die(1, cp, endp - cp);
a0f15fa5 77}
e83c5163 78
a633fca0 79int cmd_cat_file(int argc, const char **argv, const char *prefix)
e83c5163
LT
80{
81 unsigned char sha1[20];
82 char type[20];
83 void *buf;
84 unsigned long size;
7950571a 85 int opt;
e83c5163 86
84a9b58c 87 git_config(git_default_config);
31fff305 88 if (argc != 3)
a0f15fa5 89 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
31fff305
DL
90 if (get_sha1(argv[2], sha1))
91 die("Not a valid object name %s", argv[2]);
7950571a
PA
92
93 opt = 0;
94 if ( argv[1][0] == '-' ) {
95 opt = argv[1][1];
96 if ( !opt || argv[1][2] )
97 opt = -1; /* Not a single character option */
98 }
99
100 buf = NULL;
101 switch (opt) {
102 case 't':
103 if (!sha1_object_info(sha1, type, NULL)) {
104 printf("%s\n", type);
f2a06330 105 return 0;
11e7d5c5 106 }
7950571a
PA
107 break;
108
109 case 's':
110 if (!sha1_object_info(sha1, type, &size)) {
111 printf("%lu\n", size);
112 return 0;
113 }
114 break;
115
116 case 'e':
117 return !has_sha1_file(sha1);
118
a0f15fa5 119 case 'p':
31fff305 120 if (sha1_object_info(sha1, type, NULL))
a0f15fa5
JH
121 die("Not a valid object name %s", argv[2]);
122
123 /* custom pretty-print here */
8e440259 124 if (!strcmp(type, tree_type))
b931aa5a 125 return cmd_ls_tree(2, argv + 1, NULL);
a0f15fa5
JH
126
127 buf = read_sha1_file(sha1, type, &size);
128 if (!buf)
129 die("Cannot read object %s", argv[2]);
eddd1c8c
DR
130 if (!strcmp(type, tag_type)) {
131 pprint_tag(sha1, buf, size);
132 return 0;
133 }
a0f15fa5
JH
134
135 /* otherwise just spit out the data */
136 break;
7950571a 137 case 0:
11e7d5c5 138 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
7950571a
PA
139 break;
140
141 default:
142 die("git-cat-file: unknown option: %s\n", argv[1]);
bf0c6e83
LT
143 }
144
11e7d5c5 145 if (!buf)
bab5583a 146 die("git-cat-file %s: bad file", argv[2]);
11e7d5c5 147
7230e6d0 148 write_or_die(1, buf, size);
bf0c6e83 149 return 0;
e83c5163 150}