// Prism plugin for title/filename
( function() {
	const hook = function( env ) {
		const pre = env.element.parentNode;
		if ( ! pre || ! /pre/i.test( pre.nodeName ) ) {
			return;
		}

		// check for title div already exists
		// autoload runs twice for languages
		const matches = pre.getElementsByClassName( 'prism-titlename' );
		if ( matches.length > 0 ) {
			return;
		}

		// Create wrapper for <pre> to prevent scrolling toolbar with content
		if ( pre.getAttribute( 'title' ) ) {
			const title = document.createElement( 'div' );
			title.classList.add( 'prism-titlename' );
			title.innerHTML = pre.getAttribute( 'title' );
			pre.prepend( title );
		}
	};

	/**
	 * Register the toolbar with Prism.
	 */
	Prism.hooks.add( 'complete', hook );
}() );