cat-file.c 5.81 KB
Newer Older
1
/*
2
 * libgit2 "cat-file" example - shows how to print data from the ODB
3
 *
4 5 6 7 8 9 10 11 12
 * Written by the libgit2 contributors
 *
 * To the extent possible under law, the author(s) have dedicated all copyright
 * and related and neighboring rights to this software to the public domain
 * worldwide. This software is distributed without any warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication along
 * with this software. If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
13
 */
14

15
#include "common.h"
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

static void print_signature(const char *header, const git_signature *sig)
{
	char sign;
	int offset, hours, minutes;

	if (!sig)
		return;

	offset = sig->when.offset;
	if (offset < 0) {
		sign = '-';
		offset = -offset;
	} else {
		sign = '+';
	}

	hours   = offset / 60;
	minutes = offset % 60;

	printf("%s %s <%s> %ld %c%02d%02d\n",
		   header, sig->name, sig->email, (long)sig->when.time,
		   sign, hours, minutes);
}

Ben Straub committed
41
/** Printing out a blob is simple, get the contents and print */
42 43 44
static void show_blob(const git_blob *blob)
{
	/* ? Does this need crlf filtering? */
45
	fwrite(git_blob_rawcontent(blob), (size_t)git_blob_rawsize(blob), 1, stdout);
46 47
}

48
/** Show each entry with its type, id and attributes */
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
static void show_tree(const git_tree *tree)
{
	size_t i, max_i = (int)git_tree_entrycount(tree);
	char oidstr[GIT_OID_HEXSZ + 1];
	const git_tree_entry *te;

	for (i = 0; i < max_i; ++i) {
		te = git_tree_entry_byindex(tree, i);

		git_oid_tostr(oidstr, sizeof(oidstr), git_tree_entry_id(te));

		printf("%06o %s %s\t%s\n",
			git_tree_entry_filemode(te),
			git_object_type2string(git_tree_entry_type(te)),
			oidstr, git_tree_entry_name(te));
	}
}

67 68 69
/**
 * Commits and tags have a few interesting fields in their header.
 */
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
static void show_commit(const git_commit *commit)
{
	unsigned int i, max_i;
	char oidstr[GIT_OID_HEXSZ + 1];

	git_oid_tostr(oidstr, sizeof(oidstr), git_commit_tree_id(commit));
	printf("tree %s\n", oidstr);

	max_i = (unsigned int)git_commit_parentcount(commit);
	for (i = 0; i < max_i; ++i) {
		git_oid_tostr(oidstr, sizeof(oidstr), git_commit_parent_id(commit, i));
		printf("parent %s\n", oidstr);
	}

	print_signature("author", git_commit_author(commit));
	print_signature("committer", git_commit_committer(commit));

	if (git_commit_message(commit))
		printf("\n%s\n", git_commit_message(commit));
}

static void show_tag(const git_tag *tag)
{
	char oidstr[GIT_OID_HEXSZ + 1];

	git_oid_tostr(oidstr, sizeof(oidstr), git_tag_target_id(tag));;
	printf("object %s\n", oidstr);
	printf("type %s\n", git_object_type2string(git_tag_target_type(tag)));
	printf("tag %s\n", git_tag_name(tag));
	print_signature("tagger", git_tag_tagger(tag));

	if (git_tag_message(tag))
		printf("\n%s\n", git_tag_message(tag));
}

enum {
	SHOW_TYPE = 1,
	SHOW_SIZE = 2,
	SHOW_NONE = 3,
	SHOW_PRETTY = 4
};

112 113 114 115 116 117 118 119 120 121
/* Forward declarations for option-parsing helper */
struct opts {
	const char *dir;
	const char *rev;
	int action;
	int verbose;
};
static void parse_opts(struct opts *o, int argc, char *argv[]);


122
/** Entry point for this command */
123 124
int main(int argc, char *argv[])
{
125 126
	git_repository *repo;
	struct opts o = { ".", NULL, 0, 0 };
127 128 129
	git_object *obj = NULL;
	char oidstr[GIT_OID_HEXSZ + 1];

130
	git_libgit2_init();
131

132
	parse_opts(&o, argc, argv);
133

134 135 136 137
	check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),
			"Could not open repository", NULL);
	check_lg2(git_revparse_single(&obj, repo, o.rev),
			"Could not resolve", o.rev);
138

139
	if (o.verbose) {
140 141 142 143 144 145 146
		char oidstr[GIT_OID_HEXSZ + 1];
		git_oid_tostr(oidstr, sizeof(oidstr), git_object_id(obj));

		printf("%s %s\n--\n",
			git_object_type2string(git_object_type(obj)), oidstr);
	}

147
	switch (o.action) {
148 149 150 151 152 153 154
	case SHOW_TYPE:
		printf("%s\n", git_object_type2string(git_object_type(obj)));
		break;
	case SHOW_SIZE: {
		git_odb *odb;
		git_odb_object *odbobj;

155 156 157
		check_lg2(git_repository_odb(&odb, repo), "Could not open ODB", NULL);
		check_lg2(git_odb_read(&odbobj, odb, git_object_id(obj)),
			"Could not find obj", NULL);
158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190

		printf("%ld\n", (long)git_odb_object_size(odbobj));

		git_odb_object_free(odbobj);
		git_odb_free(odb);
		}
		break;
	case SHOW_NONE:
		/* just want return result */
		break;
	case SHOW_PRETTY:

		switch (git_object_type(obj)) {
		case GIT_OBJ_BLOB:
			show_blob((const git_blob *)obj);
			break;
		case GIT_OBJ_COMMIT:
			show_commit((const git_commit *)obj);
			break;
		case GIT_OBJ_TREE:
			show_tree((const git_tree *)obj);
			break;
		case GIT_OBJ_TAG:
			show_tag((const git_tag *)obj);
			break;
		default:
			printf("unknown %s\n", oidstr);
			break;
		}
		break;
	}

	git_object_free(obj);
191
	git_repository_free(repo);
192

193
	git_libgit2_shutdown();
194 195 196

	return 0;
}
197

198
/** Print out usage information */
199 200 201 202 203 204 205 206 207 208 209 210
static void usage(const char *message, const char *arg)
{
	if (message && arg)
		fprintf(stderr, "%s: %s\n", message, arg);
	else if (message)
		fprintf(stderr, "%s\n", message);
	fprintf(stderr,
			"usage: cat-file (-t | -s | -e | -p) [-v] [-q] "
			"[-h|--help] [--git-dir=<dir>] <object>\n");
	exit(1);
}

211
/** Parse the command-line options taken from git */
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
static void parse_opts(struct opts *o, int argc, char *argv[])
{
	struct args_info args = ARGS_INFO_INIT;

	for (args.pos = 1; args.pos < argc; ++args.pos) {
		char *a = argv[args.pos];

		if (a[0] != '-') {
			if (o->rev != NULL)
				usage("Only one rev should be provided", NULL);
			else
				o->rev = a;
		}
		else if (!strcmp(a, "-t"))
			o->action = SHOW_TYPE;
		else if (!strcmp(a, "-s"))
			o->action = SHOW_SIZE;
		else if (!strcmp(a, "-e"))
			o->action = SHOW_NONE;
		else if (!strcmp(a, "-p"))
			o->action = SHOW_PRETTY;
		else if (!strcmp(a, "-q"))
			o->verbose = 0;
		else if (!strcmp(a, "-v"))
			o->verbose = 1;
		else if (!strcmp(a, "--help") || !strcmp(a, "-h"))
			usage(NULL, NULL);
		else if (!match_str_arg(&o->dir, &args, "--git-dir"))
			usage("Unknown option", a);
	}

	if (!o->action || !o->rev)
		usage(NULL, NULL);

}