Crawler frontend

lib/main.js

Index: lib/main.js
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new file mode 100644
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+/*
+ * This Source Code is subject to the terms of the Mozilla Public License
+ * version 2.0 (the "License"). You can obtain a copy of the License at
+ * http://mozilla.org/MPL/2.0/.
+ */
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+let {WindowObserver} = require("windowObserver");
+
+let knownWindowTypes =
+{
+  "navigator:browser": true,
+  __proto__: null
+};
+
+new WindowObserver({
+  applyToWindow: function(window)
+  {
+    let type = window.document.documentElement.getAttribute("windowtype");
+    if (!(type in knownWindowTypes))
+      return;
+
+    window.addEventListener("popupshowing", popupShowingHandler, false);
+    window.addEventListener("popuphidden", popupHiddenHandler, false);
+  },
+
+  removeFromWindow: function(window)
+  {
+    let type = window.document.documentElement.getAttribute("windowtype");
+    if (!(type in knownWindowTypes))
+      return;
+
+    window.removeEventListener("popupshowing", popupShowingHandler, false);
+    window.removeEventListener("popuphidden", popupHiddenHandler, false);
+  }
+});
+
+function getMenuItem()
+{
+  // Randomize URI to work around bug 719376
+  let stringBundle = Services.strings.createBundle("chrome://abpcrawler/locale/global.properties?" + Math.random());
+  let result = [stringBundle.GetStringFromName("crawler.label")];
+
+  getMenuItem = function() result;
+  return getMenuItem();
+}
+
+function popupShowingHandler(event)
+{
+  let popup = event.target;
+  if (!/^(abp-(?:toolbar|status|menuitem)-)popup$/.test(popup.id))
+    return;
+
+  popupHiddenHandler(event);
+
+  let [label] = getMenuItem();
+  let item = popup.ownerDocument.createElement("menuitem");
+  item.setAttribute("label", label);
+  item.setAttribute("class", "abpcrawler-item");
+
+  item.addEventListener("command", popupCommandHandler, false);
+
+  let insertBefore = null;
+  for (let child = popup.firstChild; child; child = child.nextSibling)
+    if (/-options$/.test(child.id))
+      insertBefore = child;
+  popup.insertBefore(item, insertBefore);
+}
+
+function popupHiddenHandler(event)
+{
+  let popup = event.target;
+  if (!/^(abp-(?:toolbar|status|menuitem)-)popup$/.test(popup.id))
+    return;
+
+  let items = popup.getElementsByClassName("abpcrawler-item");
+  while (items.length)
+    items[0].parentNode.removeChild(items[0]);
+}
+
+function popupCommandHandler(event)
+{
+  if (!("@adblockplus.org/abp/public;1" in Cc))
+    return;
+
+  let crawlerWnd = Services.wm.getMostRecentWindow("abpcrawler:crawl");
+  if (crawlerWnd)
+    crawlerWnd.focus();
+  else
+    event.target.ownerDocument.defaultView.openDialog("chrome://abpcrawler/content/crawler.xul", "_blank", "chrome,centerscreen,resizable,dialog=no");
+}