A BBC tag for adding gist snippets

GistTag.php

<?php

function gist_bbc(&$codes, &$no_autolink_tags, &$itemcodes)
{
	$codes[] = array(
		'tag' => 'gist',
		'type' => 'unparsed_content',
		'content' => '<script src="$1.js"></script>',
		'validate' => function(&$tag, &$data, $disabled) {
			$data = strtr($data, array('<br />' => ''));
			if (strpos($data, 'http://') !== 0 && strpos($data, 'https://') !== 0)
				$data = 'https://' . $data;
		},
	);

	$no_autolink_tags[] = 'gist';
}