Youtube to OPML.js

// This script will generate an OPML from your YouTube subscriptions 
// and write it to clipboard, or failing that, to the browser console.
// In order to use it, navigate to <https://www.youtube.com/feed/channels>,
// open the browser developer console, and copy-paste the following
// javascript into the prompt.
//
// In order to grab the resulting script in Firefox, if copying
// to clipboard fails, right-click on the output message in the
// console and select "Copy object" from the menu.
//
// This can be made into a bookmarklet easily. First, copy the script below.
// Then, open the bookmark manager, create a bookmark somewhere appropriate.
// Into the "Location" input type "javascript:" and then paste the script
// you copied.  Should work fine.
//
// It'll alert to tell you if the resulting OPML was copied to clipboard
// or written to the console.

(async function(){
  var rssbase = 'http://www.youtube.com/feeds/videos.xml?channel_id=';
  var opml = document.implementation.createDocument("", 'opml', null);
  var head = opml.createElement('head');
  opml.documentElement.appendChild(head);
  var title = opml.createElement('title');
  title.innerHTML = 'YouTube Subscriptions OPML';
  head.appendChild(title);
  var dateCreat = opml.createElement('dateCreated');
  var dateMod = opml.createElement('dateModified');
  var date = new Date().toString();
  dateCreat.innerHTML = date;
  dateMod.innerHTML = date;
  head.appendChild(dateCreat);
  head.appendChild(dateMod);
  var body = opml.createElement('body');
  opml.documentElement.appendChild(body);
  Array.from(
    document.querySelectorAll(
      '#grid-container div#info-section a.channel-link'
    )
  ).map(
    function (c) {
      var e = opml.createElement('outline');
      e.setAttribute('text', c.querySelector('.ytd-channel-name').innerText);
      e.setAttribute('title', c.querySelector('.ytd-channel-name').innerText);
      e.setAttribute('htmlUrl', c.href);
      e.setAttribute('type', 'rss');
      e.setAttribute('version', 'RSS2');
      e.setAttribute('xmlUrl', rssbase + c.href.split('/').reverse()[0]);
      body.appendChild(e);
    }
  );
  var opmlText = new XMLSerializer().serializeToString(opml.documentElement);
  try {
    await navigator.clipboard.writeText(opmlText);
    alert("Wrote OPML to clipboard!");
  } catch (err) {
    var node = document.createElement('textarea');
    var selection = document.getSelection();

    node.textContent = opmlText;
    document.body.appendChild(node);

    selection.removeAllRanges();
    node.select();
    if(document.execCommand('copy')){
      alert("Wrote OPML to clipboard! (via shitty method)");
    } else {
      console.log(opmlText);
      alert("Wrote OPML to console because f*** the web...")
    }
    selection.removeAllRanges();
    document.body.removeChild(node);
  }
})();