compare-links-releases.js

// ==UserScript==
// @name         Compare Links on releases
// @version      0.1
// @description  Add links next to tags when there is no releases
// @author       Antoine Bolvy <[email protected]>
// @match        https://github.com/*/releases
// @grant        none
// ==/UserScript==

var insertLinks = function() {
  var elements = document.querySelectorAll('div.release-timeline a > span.tag-name, div.release-timeline a > span.css-truncate-target');
  for (var i = 0; elements[i]; i++) {
    if(!elements[i + 1]) {
      return;
    }
  var compare = elements[i + 1].textContent + '...' + elements[i].textContent;
    var link = document.createElement("a");
    link.href = window.location.href.replace('releases', 'compare') + '/' + compare + '?a=a';
    link.innerHTML = 'Compare';
    link.style.cssFloat = "right"
    link.target = "_blank";
    var insert = document.querySelector('div.release-timeline .tag-info h3 a[href$="' + elements[i].textContent + '"]');
    if(insert) {
      insert.parentNode.appendChild(link);
    }
  }
};

document.addEventListener('DOMContentLoaded', function() {
  insertLinks();
});