Embed Gist - WordPress

functions.php

<?php

// Embed gist without JavaScript in WordPress
wp_embed_register_handler( 'gist', '/https?:\/\/gist\.github\.com\/([a-z0-9\/]+)([\?\#]file[=-].*)?/i', 'qr_embed_gist' );
function qr_embed_gist( $matches, $attr, $url, $rawattr ) {
	if(empty($matches[1])){$matches[1]=null;}
	if(empty($matches[2])){$matches[2]=null;} // Query single file
	
	$file = wp_remote_get( esc_url_raw( 'https://gist.github.com/' . esc_attr($matches[1]) . '.json' ) );
	
	if ( !is_wp_error($file) && 200 == $file['response']['code'] ) {
		$giton = $file['body'];
		$giton = json_decode($giton, true);
		$embed = '<pre><code class="gist-embed">' . preg_replace( "/^\s+|\n|\r|\s+$/m", "", $giton["div"] ) . '</code></pre>';
		wp_enqueue_style( 'gist', esc_url_raw( $giton["stylesheet"] ) );
	}else{
		$embed = 'Error: ' . $file['response']['code'] . ' - Invalid Gist URL';
	}
	
	return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );
}

functions2.php

<?php

// Another way to Embed gist with <noscript> as fallback - WordPress
wp_embed_register_handler( 'gist', '/https?:\/\/gist\.github\.com\/([a-z0-9\/]+)([\?\#]file[=-].*)?/i', 'qr_embed_gist' );
function qr_embed_gist( $matches, $attr, $url, $rawattr ) {
	if(empty($matches[1])){$matches[1]=null;}
	if(empty($matches[2])){$matches[2]=null;} // Query single file
	
	$urlx = esc_url_raw( 'https://gist.github.com/' . esc_attr($matches[1]) );
	$file = wp_remote_get( $urlx . '.json' );
	
	if ( !is_wp_error($file) && 200 == $file['response']['code'] ) {
		$giton = $file['body'];
		$giton = json_decode($giton, true);
		$giton = strip_tags($giton["div"], '<a>');
		$embed = '<script src="' . $urlx . '.js' . '"></script>';
		$embed .= '<noscript><pre><code class="gist-embed">' . preg_replace( "/        |\s+$/m", "", $giton ) . '</code></pre></noscript>';
	}else{
		$embed = 'Error: ' . $file['response']['code'] . ' - Invalid Gist URL';
	}
	
	return apply_filters( 'embed_gist', $embed, $matches, $attr, $url, $rawattr );
}