Merge branch 'jc/grep'
[git/git.git] / cat-file.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7 #include "exec_cmd.h"
8 #include "tag.h"
9 #include "tree.h"
10
11 static void flush_buffer(const char *buf, unsigned long size)
12 {
13 while (size > 0) {
14 long ret = xwrite(1, buf, size);
15 if (ret < 0) {
16 /* Ignore epipe */
17 if (errno == EPIPE)
18 break;
19 die("git-cat-file: %s", strerror(errno));
20 } else if (!ret) {
21 die("git-cat-file: disk full?");
22 }
23 size -= ret;
24 buf += ret;
25 }
26 }
27
28 static int pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
29 {
30 /* the parser in tag.c is useless here. */
31 const char *endp = buf + size;
32 const char *cp = buf;
33
34 while (cp < endp) {
35 char c = *cp++;
36 if (c != '\n')
37 continue;
38 if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
39 const char *tagger = cp;
40
41 /* Found the tagger line. Copy out the contents
42 * of the buffer so far.
43 */
44 flush_buffer(buf, cp - buf);
45
46 /*
47 * Do something intelligent, like pretty-printing
48 * the date.
49 */
50 while (cp < endp) {
51 if (*cp++ == '\n') {
52 /* tagger to cp is a line
53 * that has ident and time.
54 */
55 const char *sp = tagger;
56 char *ep;
57 unsigned long date;
58 long tz;
59 while (sp < cp && *sp != '>')
60 sp++;
61 if (sp == cp) {
62 /* give up */
63 flush_buffer(tagger,
64 cp - tagger);
65 break;
66 }
67 while (sp < cp &&
68 !('0' <= *sp && *sp <= '9'))
69 sp++;
70 flush_buffer(tagger, sp - tagger);
71 date = strtoul(sp, &ep, 10);
72 tz = strtol(ep, NULL, 10);
73 sp = show_date(date, tz);
74 flush_buffer(sp, strlen(sp));
75 xwrite(1, "\n", 1);
76 break;
77 }
78 }
79 break;
80 }
81 if (cp < endp && *cp == '\n')
82 /* end of header */
83 break;
84 }
85 /* At this point, we have copied out the header up to the end of
86 * the tagger line and cp points at one past \n. It could be the
87 * next header line after the tagger line, or it could be another
88 * \n that marks the end of the headers. We need to copy out the
89 * remainder as is.
90 */
91 if (cp < endp)
92 flush_buffer(cp, endp - cp);
93 return 0;
94 }
95
96 int main(int argc, char **argv)
97 {
98 unsigned char sha1[20];
99 char type[20];
100 void *buf;
101 unsigned long size;
102 int opt;
103
104 setup_git_directory();
105 git_config(git_default_config);
106 if (argc != 3)
107 usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
108 if (get_sha1(argv[2], sha1))
109 die("Not a valid object name %s", argv[2]);
110
111 opt = 0;
112 if ( argv[1][0] == '-' ) {
113 opt = argv[1][1];
114 if ( !opt || argv[1][2] )
115 opt = -1; /* Not a single character option */
116 }
117
118 buf = NULL;
119 switch (opt) {
120 case 't':
121 if (!sha1_object_info(sha1, type, NULL)) {
122 printf("%s\n", type);
123 return 0;
124 }
125 break;
126
127 case 's':
128 if (!sha1_object_info(sha1, type, &size)) {
129 printf("%lu\n", size);
130 return 0;
131 }
132 break;
133
134 case 'e':
135 return !has_sha1_file(sha1);
136
137 case 'p':
138 if (sha1_object_info(sha1, type, NULL))
139 die("Not a valid object name %s", argv[2]);
140
141 /* custom pretty-print here */
142 if (!strcmp(type, tree_type))
143 return execl_git_cmd("ls-tree", argv[2], NULL);
144
145 buf = read_sha1_file(sha1, type, &size);
146 if (!buf)
147 die("Cannot read object %s", argv[2]);
148 if (!strcmp(type, tag_type))
149 return pprint_tag(sha1, buf, size);
150
151 /* otherwise just spit out the data */
152 break;
153 case 0:
154 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
155 break;
156
157 default:
158 die("git-cat-file: unknown option: %s\n", argv[1]);
159 }
160
161 if (!buf)
162 die("git-cat-file %s: bad file", argv[2]);
163
164 flush_buffer(buf, size);
165 return 0;
166 }