[PATCH] Unify usage strings declaration

[thirdparty/git.git] / var.c

/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Eric Biederman, 2005
 */
#include "cache.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>

static const char var_usage[] = "git-var [-l | <variable>]";

struct git_var {
	const char *name;
	char *(*read)(void);
};
static struct git_var git_vars[] = {
	{ "GIT_COMMITTER_IDENT", git_committer_info },
	{ "GIT_AUTHOR_IDENT",   git_author_info },
	{ "", NULL },
};

static void list_vars(void)
{
	struct git_var *ptr;
	for(ptr = git_vars; ptr->read; ptr++) {
		printf("%s=%s\n", ptr->name, ptr->read());
	}
}

static const char *read_var(const char *var)
{
	struct git_var *ptr;
	const char *val;
	val = NULL;
	for(ptr = git_vars; ptr->read; ptr++) {
		if (strcmp(var, ptr->name) == 0) {
			val = ptr->read();
			break;
		}
	}
	return val;
}

int main(int argc, char **argv)
{
	const char *val;
	if (argc != 2) {
		usage(var_usage);
	}
	setup_ident();
	val = NULL;

	if (strcmp(argv[1], "-l") == 0) {
		list_vars();
		return 0;
	}
	val = read_var(argv[1]);
	if (!val)
		usage(var_usage);
	
	printf("%s\n", val);
	
	return 0;
}