Greasemonkey script for RealEstate.com.au - Hide previously viewed properties

hide-previously-viewed-properties-realestate-com-au.user.js

// ==UserScript==
// @name        Realestate.com.au hide previously viewed properties
// @namespace   http://www.sacah.net
// @include     http://www.realestate.com.au/*
// @version     1
// @grant       none
// @license     None
// ==/UserScript==

/* Clear saved results with
  localStorage.setItem('viewedProps', '');
  
*/

function override(object, method, callback) {
  object[method]=callback(object[method])
}

override(LMI.CORS, 'CORSRequest', function(creq) {
  return function () {
    override(arguments[2], 'success', function(success) {
      return function (xhr) {
        var data=JSON.parse(xhr.response);
        if(data.tieredResults) {
          var viewedProps=localStorage.getItem('viewedProps') || '';
          viewedProps=viewedProps.split(',');
          function removeSeen(propList) {
            var tmp=[];
            for(var a=0, len=propList.results.length; a<len; a++) {
              if(viewedProps.indexOf(propList.results[a].listingId)==-1) {
                tmp.push(propList.results[a]);
                viewedProps.push(propList.results[a].listingId);
              }
            }
            propList.results=tmp;
            propList.count=tmp.length;
            return propList;
          }
          var total=0;
          for(var a=0, len=data.tieredResults.length; a<len; a++) {
            data.tieredResults[a]=removeSeen(data.tieredResults[a]);
            total+=data.tieredResults[a].count;
          }
          localStorage.setItem('viewedProps', viewedProps.join(','));
          data.totalResultsCount=total;
          var newXhr={};
          for(var a in xhr) newXhr[a]=xhr[a];

          newXhr.response=newXhr.responseText=JSON.stringify(data);
        } else newXhr=xhr;
        success.apply(this, [newXhr]);
      }
    });
    creq.apply(this, arguments);
  }
});