User:NTox/duplinks.js

Code that you insert on this page could contain malicious content capable of compromising your account. If you import a script from another page with "importScript", "mw.loader.load", "iusc", or "lusc", take note that this causes you to dynamically load a remote script, which could be changed by others. Editors are responsible for all edits and actions they perform, including by scripts. User scripts are not centrally supported and may malfunction or become inoperable due to software changes. A guide to help you find broken scripts is available. If you are unsure whether code you are adding to this page is safe, you can ask at the appropriate village pump.
This code will be executed when previewing this page.

Documentation for this user script can be added at User:NTox/duplinks.

Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

// Modified from User:Ucucha/duplinks.js

$( function($) {
    if((wgNamespaceNumber != 0) && (wgNamespaceNumber != 2)) {
        // only check links in mainspace and userspace (for userspace drafts)
        return;
    }
    var portletlink = mw.util.addPortletLink('p-tb', '#', 'Duplicate links', 'ca-findduplicatelinks');
    $(portletlink).click( function(e) {
        e.preventDefault();
        // create a separate div surrounding the lead
        // first get the element immediately surrounding the article text. Unfortunately, MW doesn't seem to provide a non-fragile way for that.
        var content = ".mw-content-ltr";
        $(content).prepend(document.createElement('div'));
        var lead = $(content).children()[0];
        $(lead).attr('id', 'lead');
        $(content).children().each( function() {
            if(this.nodeName.toLowerCase() == 'h2') {
                return false;
            }
            if($(this).attr('id') != 'lead') {
                $(lead).append(this);
            }
            return true;
        });
 
        // detect duplicate links
        mw.util.addCSS(".duplicate-link { border: 1px solid red; }");
        var finddups = function() {
            var href = $(this).attr('href');
            if(href != undefined && href.indexOf('#') != 0) {
                if(seen[href]) {
                    $(this).addClass("duplicate-link");
                }
                else {
                    seen[href] = true;
                }
            }
            return true;
        };
        // array to keep track of whether we've seen a link before
        var seen = [];
        mw.util.$content.find('p a').not('#lead *, .infobox *, .navbox *').each(finddups);
        var seen = [];
        mw.util.$content.find('#lead p a').not('.infobox *, .navbox *').each(finddups);
    });
});