Add gist to wordpress. single and multi file

ShortCode-Gist.php

<?php
//add shortoce gist to wordpress
//Use [gist id="" file=""]
/*
EX: https://gist.github.com/fae35ed5bf667d968a68#file-shortcode-gist-php
=> shortcode: [gist id="fae35ed5bf667d968a68" file="ShortCode-Gist.php"]
*/

function gist_func( $atts ){
	$atts = shortcode_atts( array(
		'id' => '',
		'file' => ''
	), $atts, 'gist' );
	if($atts['id']){
		$file = ($atts["file"]) ? '?file='.$atts["file"] : '';
		return '<script src="https://gist.github.com/'.$atts['id'].'.js'.$file.'"></script>';
	}else{
		return false;
	}
}
add_shortcode('gist','gist_func');