Calculate additions - deletions in the contributors graph on github

contributors-graph-addon.user.js

// ==UserScript==
// @name Github contributors graph addon
// @author Sleeyax
// @namespace Violentmonkey Scripts
// @match https://github.com/*/graphs/contributors
// @grant none
// @inject-into content
// ==/UserScript==

var x = setInterval(function() {
  var added = document.getElementsByClassName("text-green");
  var deleted = document.getElementsByClassName("text-red");

  for (var i=0; i<added.length; i++) {
    var a = added[i].innerText.replace(",", "").replace(" ++", "");
    var b = deleted[i].innerText.replace(",", "").replace(" --", "");
    var c = a - b;
    deleted[i].insertAdjacentHTML("afterEnd", '<span class="text-blue text-normal"> ' + c +' diff</span>');
  }
  
  if (document.getElementsByClassName("text-blue").length > 0) {
    clearInterval(x);
  }
  
}, 1000);