"use strict";

import fs from 'fs';
import path from 'path';

export default async function(git_dir) {
	const gitId = await fs.promises.readFile(path.join(git_dir, "HEAD"), 'utf8');
	if (gitId.indexOf(':') === -1)
		return gitId;
	
	const refPath = path.join(git_dir, gitId.substring(5).trim());
	return await fs.promises.readFile(refPath, 'utf8');
}