Added a link to download the branch as a ZIP file

github.js

@@ -1,6 +1,6 @@
 // GitHub CSS fixes
-// version 1.0
-// 2021-12-23
+// version 1.1
+// 2022-04-04
 // Copyright (c) 2021 Created by Georgios Sokianos
 // Released under the GPL license
 // http://www.gnu.org/copyleft/gpl.html
@@ -10,7 +10,7 @@
 // @namespace      none
 // @description    Fixes css in GitHub
 // @include        https://github.com/*
-// @version        $VER: GitHub CSS fixes 1.0 (23.12.2021)
+// @version        $VER: GitHub CSS fixes 1.1 (04.04.2022)
 // @url            https://ko-fi.com/walkero
 // ==/UserScript==
 
@@ -67,3 +67,31 @@ if (style.styleSheet){
   style.appendChild(document.createTextNode(css));
 }
 
+window.onload = function () {
+  var canonicalElem = document.querySelector("link[rel='canonical']");
+  if (canonicalElem !== null) {
+    var canonicalUrl = canonicalElem.href;
+    var container = document.getElementById("repository-container-header");
+    var archiveText = document.createTextNode("Download ZIP");
+    var archiveUrl = canonicalUrl;
+    
+    if (canonicalUrl.indexOf("tree") > -1) {
+      archiveUrl = archiveUrl.replace("tree", "archive/refs/heads");
+    } else {
+      var branchElem = document.querySelector("span[data-menu-button]");
+      if (branchElem !== null) {
+        archiveUrl += "/archive/refs/heads/" + branchElem.textContent;
+      }
+    }
+    
+    if (archiveUrl != canonicalUrl) {
+      var archiveLink = document.createElement("a");
+      archiveLink.appendChild(archiveText);
+      archiveLink.title = "Download as a ZIP file";
+      archiveLink.href = archiveUrl + ".zip";
+      
+      container.appendChild(archiveLink);
+    }
+  }
+}
+