User:Ricordisamoa/CFD.js

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/*
 * When clicking a link pointing to a CFD subpage from a deleted category,
 * search the page for the corresponding section.
 *
 * @author [[User:Ricordisamoa]]
 */
$( function () {
	if (
		mw.config.get( 'wgNamespaceNumber' ) !== 4 ||
		mw.config.get( 'wgTitle' ).slice( 0, 30 ) !== 'Categories for discussion/Log/' ||
		!document.referrer
	) {
		return;
	}
	mw.loader.using( [ 'mediawiki.RegExp', 'mediawiki.Title', 'mediawiki.Uri' ] ).done( function () {
		var getPageTitle = function ( href ) {
			try {
				href = new mw.Uri( href );
			} catch ( e ) {
				return;
			}

			if ( href.query.hasOwnProperty( 'title' ) ) {
				return href.query.title;
			} else {
				var titleRegex = new RegExp( mw.RegExp.escape( mw.config.get( 'wgArticlePath' ) )
					.replace( '\\$1', '(.+)' ) ),
				matches = titleRegex.exec( href.path );
				return matches ? decodeURIComponent( matches[1] ) : undefined;
			}
		};

		var title = getPageTitle( document.referrer );
		if ( !title ) {
			return;
		}

		title = mw.Title.newFromUserInput( title );
		if ( title && title.getNamespaceId && title.getNamespaceId() === 14 && title.getPrefixedText ) {
			var expectedText = title.getPrefixedText(),
			$anchors = mw.util.$content
			.find( '.mw-headline' )
			.filter( function () {
				return this.hasAttribute( 'id' ) && // a real anchor
					this.children.length === 0 && // with no Element children
					this.childNodes.length === 1 && // but one Node child (we assume Text)
					this.firstChild.textContent === expectedText;
			} );
			if ( $anchors.length === 1 ) {
				window.location.hash = $anchors.first().attr( 'id' );
			}
		}
	} );
} );