Calculate total duration of a Kaltura playlist

GaTechKalturaPlaylistDuration.js

// ==UserScript==
// @name          Display total play time in playlist.
// @namespace     gatech.edu
// @version       0.1.0
// @match         *://canvasgatechtest.kaf.kaltura.com/*
// @match         *://cdnapisec.kaltura.com/*
// @grant         none
// @author        Aaron Spike
// @description   1/25/2021
// ==/UserScript==


kWidget.addReadyCallback(function(playerId){
  let totalDuration = '';
  let description = '';
  let kdp = document.getElementById(playerId);
  kdp.kBind("playlistReady", function() {
    const playlist = document.querySelector('.playlistInterface');
    const desc = playlist.querySelector('.playlistDescription');
    description = description || desc.innerText;
    let total = 0;
    playlist.querySelectorAll('.k-duration').forEach(function(elt){
      let m, s;
      [m,s] = elt.innerText.split(':');
      total += m*60 + s*1;
    });
    totalDuration = ' ( <span id="current-duration-holder">0:00</span> / '+ Math.trunc(total/60) + ':' + (total%60) + ')';
    desc.innerHTML = description + totalDuration;
  });
  kdp.kBind("playlistMiddleEntry", function(){
    const playlist = document.querySelector('.playlistInterface');
    const durElt = document.getElementById('current-duration-holder');
    let total = 0;
    Array.from(playlist.querySelectorAll('.k-duration')).some(function(elt){
        console.log(elt);
      let m, s;
      [m,s] = elt.innerText.split(':');
      total += m*60 + s*1;
      return elt.offsetParent.classList.contains('active');
    });
    durElt.innerText = Math.trunc(total/60) + ':' + (total%60);
  });
});