Adhoc Slack to Oddball Redirect.user.js

// ==UserScript==
// @name         Slack Redirector
// @namespace    boehs.com
// @include      *://adhoc.slack.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(() => {
  const regex = /https:\/\/adhoc\.slack\.com\/(.+)$/;
  const input = window.location.href;
  const match = input.match(regex);
  if (match) {
    const archive = match[1];
    console.log("archive:" +archive);
    const url = `https://oddball.slack.com/${archive}`;
    window.location.replace(url);
  }
})();

For Userscripts in Safari. Should work in Tampermonkey or other user script extensions in Chrome/FF.