Woolworths Australia Filter Script

// ==UserScript==
// @name         Woolworths Filter Script
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Automatically add &filter=SoldBy(Woolworths) to URLs on Woolworths' website
// @author       Kriptanik
// @match        https://www.woolworths.com.au/*
// @icon         https://www.woolworths.com.au/favicon.ico
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  // Check if the current page is a catalogue page
  if (window.location.href.startsWith("https://www.woolworths.com.au/shop/catalogue")) {
    return; // Exit the script if on a catalogue page
  }

  const addFilterToURL = () => {
    let url = new URL(window.location.href);

    // Check if we're in the /shop/ section and if the filter is missing
    if (url.pathname.startsWith('/shop/') && !url.searchParams.has('filter')) {
      // Manually construct the desired URL with the correct parameter format
      let query = url.searchParams.toString();
      query += (query ? '&' : '') + 'filter=SoldBy(Woolworths)';
      let newUrl = `${url.origin}${url.pathname}?${query}${url.hash}`;

      // Redirect to the correctly formatted URL
      window.location.replace(newUrl);
    }
  };

  // Run the function initially
  addFilterToURL();

  // Use a MutationObserver to detect changes in the <body> tag (common in SPAs)
  const observer = new MutationObserver(() => {
    addFilterToURL();
  });

  // Observe the entire document for changes
  observer.observe(document.body, { childList: true, subtree: true });

})();