Gist URL in WP Post

wp-gist.php

<?php
/**
 * This allows you to simply post a gist url in a WordPress 3.0+ post and it grabs the actual gist and displays it
 * For example, if your having issues or don't allow posting of embedded javascript, which should not be allowed
 * 
 * Put this code in your theme functions file 
 * then post a gist url on a new line
 * 
 * https://gist.github.com/1697338
 * 
 */
wp_embed_register_handler( 'gist', '#https://gist.github.com/([a-zA-Z0-9]+)(\#file_(.+))?$#i', 'wp_embed_handler_gist' );
/**
 * @param array $matches
 * @param array $attr
 * @param string $url
 * @param $rawattr
 *
 * @return mixed|void
 * @see http://codex.wordpress.org/Function_Reference/wp_embed_register_handler
 */
function wp_embed_handler_gist( $matches, $attr, $url, $rawattr ) {

	$embed = sprintf(
			'<script src="https://gist.github.com/%s.js%s"></script>',
			esc_attr($matches[1]), '');

	return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );
}