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+/* xkcd keyboard nav - Navigate xkcd with your keyboard
+ * 
+ * Copyright (c) 2015 Adrian Iain Lam <adrianiainlam@gmail.com>
+ * 
+ * This program is free software. It comes without any warranty, to
+ * the extent permitted by applicable law. You can redistribute it
+ * and/or modify it under the terms of the Do What The Fuck You Want
+ * To Public License, Version 2, as published by Sam Hocevar. See
+ * http://www.wtfpl.net/txt/copying/ for more details.
+ *
+ * +---------------+----------------+
+ * |   Key         |   Navigates to |
+ * +---------------+----------------+
+ * | [right arrow] |     next comic |
+ * | [left arrow]  | previous comic |
+ * | [f]           |    first comic |
+ * | [l]           |     last comic |
+ * | [r]           |   random comic |
+ * +---------------+----------------+
+ *
+ * This script uses keyboardEvent.key, which may not be supported by
+ * your browser. I have no intention to write a compatible script
+ * with keyboardEvent.keyCode as it is deprecated anyway.
+ */
+
+// ==UserScript==
+// @name        xkcd keyboard nav
+// @namespace   https://github.com/adrianiainlam
+// @description Navigate xkcd with your keyboard
+// @version     1.0.-1
+// @downloadURL
+// @updateURL
+// @include     /^https?://xkcd\.com(/[0-9]+)?/?$/
+// @grant       none
+// ==/UserScript==
+
+function showTitleText() {
+  var elem    = document.getElementById("comic");
+  var child   = elem.children[0];
+  var newnode = document.createElement("p");
+  if(child instanceof HTMLImageElement) {
+      newnode.innerHTML = child.title;
+  } else if(child instanceof HTMLAnchorElement && child.children[0] instanceof HTMLImageElement) {
+      newnode.innerHTML = child.children[0].title;
+  } else {
+      console.log("Title text not found by this script. Please file a bug report with URL");
+  }
+  elem.appendChild(newnode);
+}
+
+document.body.addEventListener("keypress", function(e) {
+  var navList = document.getElementsByClassName("comicNav")[0].children;
+  if(!e.altKey && !e.ctrlKey && !e.metaKey && !e.shiftKey) {
+    switch(e.key) {
+      case "ArrowLeft": // prev
+      case "Left": // deprecated
+        document.location.href = navList[1].firstChild.getAttribute("href");
+        break;
+      case "ArrowRight": // next
+      case "Right": // deprecated
+        document.location.href = navList[3].firstChild.getAttribute("href");
+        break;
+      case "r": // random
+        document.location.href = navList[2].firstChild.getAttribute("href");
+        break;
+      case "f": // first
+        document.location.href = navList[0].firstChild.getAttribute("href");
+        break;
+      case "l":  // last
+        document.location.href = navList[4].firstChild.getAttribute("href");
+        break;
+    }
+  }
+});
+
+showTitleText();