MediaWiki:Redirect skin.js

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/**
 * Redirect User:Name/skin.js and skin.css to the current skin's pages
 * (unless the 'skin' page really exists).
 *
 * Dependencies: mediawiki.util
 *
 * @source https://www.mediawiki.org/wiki/Snippets/Redirect_skin.js
 * @revision 2016-04-13
 */
mw.loader.using( [ 'mediawiki.util' ] ).then(function() {
	var titleParts = mw.config.get( 'wgPageName' ).split( '/' );
	isMySkin = titleParts[0] === 'Special:MySkin';
	if (isMySkin || mw.config.get( 'wgArticleId' ) === 0 && mw.config.get( 'wgNamespaceNumber' ) === 2 ) {
		// Make sure there was a part before and after the slash
		// And that the latter is 'skin.js' or 'skin.css'
		if ( titleParts.length === 2 ) {
			var userSkinPage = (isMySkin ? "User:" + mw.config.get('wgUserName') : titleParts[0])
				+ '/' + mw.config.get( 'skin' );
			if ( titleParts[1] === 'skin.js' ) {
				window.location.href = mw.util.getUrl( userSkinPage + '.js' );
			} else if ( titleParts[1] === 'skin.css' ) {
				window.location.href = mw.util.getUrl( userSkinPage + '.css' );
			}
		}
	}
});