summaryrefslogtreecommitdiff
path: root/builtin-cat-file.c
blob: f132d583d3e2a2ac0fe696b66723c846902d0a19 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "exec_cmd.h"
#include "tag.h"
#include "tree.h"
#include "builtin.h"

static void pprint_tag(const unsigned char *sha1, const char *buf, unsigned long size)
{
	/* the parser in tag.c is useless here. */
	const char *endp = buf + size;
	const char *cp = buf;

	while (cp < endp) {
		char c = *cp++;
		if (c != '\n')
			continue;
		if (7 <= endp - cp && !memcmp("tagger ", cp, 7)) {
			const char *tagger = cp;

			/* Found the tagger line.  Copy out the contents
			 * of the buffer so far.
			 */
			write_or_die(1, buf, cp - buf);

			/*
			 * Do something intelligent, like pretty-printing
			 * the date.
			 */
			while (cp < endp) {
				if (*cp++ == '\n') {
					/* tagger to cp is a line
					 * that has ident and time.
					 */
					const char *sp = tagger;
					char *ep;
					unsigned long date;
					long tz;
					while (sp < cp && *sp != '>')
						sp++;
					if (sp == cp) {
						/* give up */
						write_or_die(1, tagger,
							     cp - tagger);
						break;
					}
					while (sp < cp &&
					       !('0' <= *sp && *sp <= '9'))
						sp++;
					write_or_die(1, tagger, sp - tagger);
					date = strtoul(sp, &ep, 10);
					tz = strtol(ep, NULL, 10);
					sp = show_date(date, tz, 0);
					write_or_die(1, sp, strlen(sp));
					xwrite(1, "\n", 1);
					break;
				}
			}
			break;
		}
		if (cp < endp && *cp == '\n')
			/* end of header */
			break;
	}
	/* At this point, we have copied out the header up to the end of
	 * the tagger line and cp points at one past \n.  It could be the
	 * next header line after the tagger line, or it could be another
	 * \n that marks the end of the headers.  We need to copy out the
	 * remainder as is.
	 */
	if (cp < endp)
		write_or_die(1, cp, endp - cp);
}

int cmd_cat_file(int argc, const char **argv, const char *prefix)
{
	unsigned char sha1[20];
	enum object_type type;
	void *buf;
	unsigned long size;
	int opt;
	const char *exp_type, *obj_name;

	git_config(git_default_config);
	if (argc != 3)
		usage("git-cat-file [-t|-s|-e|-p|<type>] <sha1>");
	exp_type = argv[1];
	obj_name = argv[2];

	if (get_sha1(obj_name, sha1))
		die("Not a valid object name %s", obj_name);

	opt = 0;
	if ( exp_type[0] == '-' ) {
		opt = exp_type[1];
		if ( !opt || exp_type[2] )
			opt = -1; /* Not a single character option */
	}

	buf = NULL;
	switch (opt) {
	case 't':
		type = sha1_object_info(sha1, NULL);
		if (type > 0) {
			printf("%s\n", typename(type));
			return 0;
		}
		break;

	case 's':
		type = sha1_object_info(sha1, &size);
		if (type > 0) {
			printf("%lu\n", size);
			return 0;
		}
		break;

	case 'e':
		return !has_sha1_file(sha1);

	case 'p':
		type = sha1_object_info(sha1, NULL);
		if (type < 0)
			die("Not a valid object name %s", obj_name);

		/* custom pretty-print here */
		if (type == OBJ_TREE) {
			const char *ls_args[3] = {"ls-tree", obj_name, NULL};
			return cmd_ls_tree(2, ls_args, NULL);
		}

		buf = read_sha1_file(sha1, &type, &size);
		if (!buf)
			die("Cannot read object %s", obj_name);
		if (type == OBJ_TAG) {
			pprint_tag(sha1, buf, size);
			return 0;
		}

		/* otherwise just spit out the data */
		break;
	case 0:
		buf = read_object_with_reference(sha1, exp_type, &size, NULL);
		break;

	default:
		die("git-cat-file: unknown option: %s\n", exp_type);
	}

	if (!buf)
		die("git-cat-file %s: bad file", obj_name);

	write_or_die(1, buf, size);
	return 0;
}