MediaWiki:Gadget/Twinkle/twinklediff.js

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function twinklediff() { 
    if( wgNamespaceNumber < 0 ) {
        return;
    }

    var query = {
        'title': wgPageName,
        'diff': 'cur',
        'oldid': 'prev'
    };

    addPortletLink( 'p-cactions' , wgServer + wgScriptPath + '/index.php?' + QueryString.create( query ), 'Last', 'tw-lastdiff', 'Show most recent diff' );

    // Show additional tabs only on diff pages
    if(!QueryString.exists('diff')) return;

    addPortletLink( 'p-cactions', "javascript:twinklediff.evaluate(false);", 'Since', 'tw-since', 'Show difference between last diff and the revision made by previous user' );

    addPortletLink( 'p-cactions', "javascript:twinklediff.evaluate(true);", 'Since mine', 'tw-sincemine', 'Show difference between last diff and my last revision' );

    var oldid = document.evaluate( 'substring-after(//div[@id="mw-diff-ntitle1"]/strong/a[1]/@href, "oldid=")', document, null, XPathResult.STRING_TYPE, null).stringValue;
    var query = {
        'title': wgPageName,
        'diff': 'cur',
        'oldid' : oldid
    };
    addPortletLink( 'p-cactions' , wgServer + wgScriptPath + '/index.php?' + QueryString.create( query ), 'Current', 'tw-curdiff', 'Show difference to current revision' );
}
addOnloadHook( twinklediff );

twinklediff.evaluate = function twinklediffEvaluate(me) {
    var ntitle = getElementsByClassName( document.getElementById('bodyContent'), 'td' , 'diff-ntitle' )[0];

    var user;
    if( me ) {
        user = wgUserName;
    } else {
        var node = document.getElementById( 'mw-diff-ntitle2' );
        if( ! node ) {
            // nothing to do?
            return;
        }
        user = document.evaluate( 'a[1]', node, null, XPathResult.STRING_TYPE, null ).stringValue;
    }
    var query = {
        'prop': 'revisions',
        'action': 'query',
        'titles': wgPageName,
        'rvlimit': 1, 
        'rvprop': [ 'ids', 'user' ],
        'rvstartid': wgCurRevisionId - 1, // i.e. not the current one
        'rvuser': user
    };
    Status.init( document.getElementById('bodyContent') );
    var wikipedia_api = new Wikipedia.api( 'Grabbing data of initial contributor', query, twinklediff.callbacks.main );
    wikipedia_api.params = { user: user };
    wikipedia_api.post();
}

twinklediff.callbacks = {
    main: function( self ) {
        var xmlDoc = self.responseXML;
        var revid = xmlDoc.evaluate( '//rev/@revid', xmlDoc, null, XPathResult.NUMBER_TYPE, null ).numberValue;

        if( ! revid ) {
            self.statelem.error( 'no suitable earlier revision found, or ' + self.params.user + ' is the only contributor. Aborting.' );
            return;
        }
        var query = {
            'title': wgPageName,
            'oldid': revid,
            'diff': wgCurRevisionId
        };
        window.location = wgServer + wgScriptPath + '/index.php?' + QueryString.create( query );
    }
}