Wikimedia remarkjs attribution

// ==UserScript==
// @name           Wikimedia Commons Attribution
// @namespace      http://emiliovelis.com
// @version        0.1
// @description    This script forms the markup code to use Wikimedia Commons images including attribution information.
// @require        https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.8/clipboard.min.js
// @match          https://*.wikimedia.org/*
// ==/UserScript==


window.addEventListener('load', function() {

var name = document.getElementById("firstHeading").textContent;
var author = document.getElementById("fileinfotpl_aut").nextElementSibling.innerText;
var licenseFirst = document.getElementsByClassName("licensetpl_short")[0].innerHTML.trim();
if (license != "undefined"){
	var license = "(" + licenseFirst + ")";
}
  
if (document.querySelectorAll('.description .mw-content-ltr .en').length = 0){
	var description = document.querySelectorAll('.description .mw-content-ltr .en')[0].nextSibling.data.trim();
}else{
  var description = "";
};
if (description.length>0){description =""};

//if (description.charAt(description.length - 1) != "."){ 
  //description += ".";
//};


var url = decodeURIComponent(window.location).toString();

var inner = name + " by " + author + license + ". " + description + " Available at " + url;
var image = decodeURIComponent(document.getElementsByClassName("fullImageLink")[0].getElementsByTagName("img")[0].src);

var final = '<br><div>' + inner + '</div><br><textarea id=\"myCode\" rows=\"6\" >.large-image[![' + name + '](' + image.replace(/\(/g, '%28').replace(/\)/g, '%29') + ')]\n.footnote[' + inner + ']</textarea>';
document.getElementById("siteSub").insertAdjacentHTML('afterend', final);

}, false);