Embed Gist Github WordPress

Embed-Gist-Github-en-WordPress.php

<?php
wp_embed_register_handler( 'gist', '/https?:\/\/gist\.github\.com\/([a-z0-9]+)\/([a-z0-9]+)?/i', 'joseconti_embed_gist' );

function joseconti_embed_gist( $matches, $attr, $url, $rawattr ) {

	$embed = sprintf(
		'<script src="https://gist.github.com/%1$s/%2$s.js"></script>',
		esc_attr( $matches[1] ),
		esc_attr( $matches[2] )
	);
	return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );
}