User:Euphoria/common.js

mw.loader.using(['mediawiki.util'])
    .then(function () {
        // Extract the username from the current page title
        var pageTitle = mw.config.get('wgTitle');
        var username;

        // Check if the current page is a user contributions page
        if (mw.config.get('wgCanonicalSpecialPageName') === 'Contributions') {
            // Extract username from the contributions page using a regular expression
            var match = pageTitle.match(/Special:Contributions\/([^\/?]+)/);
            username = match ? match[1] : null;
        } else {
            // Extract username from the regular page title
            username = pageTitle.split('/')[0];
        }

        // Check if the current page is a user page, user talk page, or user contributions page
        var isUserPage = mw.config.get('wgNamespaceNumber') === 2; // User namespace
        var isTalkPage = mw.config.get('wgNamespaceNumber') === 3; // User talk namespace
        var isContributionsPage = mw.config.get('wgCanonicalSpecialPageName') === 'Contributions';

        // If the current page is a user page, user talk page, or user contributions page, and a valid username is available, add the "SUL" link
        if ((isUserPage || isTalkPage || isContributionsPage) && username !== null) {
            var sulLink = mw.util.addPortletLink(
                'p-cactions',
                mw.util.getUrl('Special:CentralAuth/' + username),
                'SUL',
                'ca-sul',
                'SUL',
                null,
                '#ca-sul'
            );
        }
    });