Super-primitive Bespin integration

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CmdUtils.CreateCommand({
  name: "bespin",
  icon: "https://bespin.mozilla.com/favicon.ico",
  homepage: "http://bespin.mozilla.com/",
  author: {name: "Atul Varma", email: "avarma@mozilla.com",
           homepage: "http://www.toolness.com"},
  license: "MIT",
  description: "Super-primitive Bespin integration.",
  help: "You can run any Bespin command-line command via Ubiquity; just make sure you're on a tab with the Bespin editor when you use the command.",
  takes: {"command": /.*/},

  preview: function(pblock, dobj) {
    var fullCommand = dobj.text;
    var parts = fullCommand.split(" ");
    var inputCmd;
    if (parts.length)
      inputCmd = parts[0];
    var esc = Utils.escapeHtml;
    // Hmm, hopefully this isn't too horribly insecure.
    var win = XPCSafeJSObjectWrapper(context.focusedWindow.wrappedJSObject);
    var commandLine = win.bespin.get('commandLine');
    if (win.bespin && commandLine) {
      var commands = commandLine.commands;
      var html = "";
      for (name in commands) {
        if (!inputCmd || name.indexOf(inputCmd) == 0) {
          var cmd = commands[name];
          var takes = "";
          if (cmd.takes)
            cmd.takes.order.forEach(
              function(arg) { takes += "[" + esc(arg) + "] "; }
            );
          html += esc(name) + " " + takes + ' <span style="color: gray">' + esc(cmd.preview) + "</span><br>";
        }
      }
      pblock.innerHTML = html;
    } else
      pblock.innerHTML = "<b>You do not have Bespin in the current tab/window.</b>";
  },
  execute: function(dobj) {
    var fullCommand = dobj.text;  
    var parts = fullCommand.split(" ");
    if (!parts.length) {
      displayMessage("No command entered!");
      return;
    }
    // Dynamically generate a <script> tag and inject it into the page.
    // (I tried just using an XPCSafeJSObjectWrapper to call the command,
    // but some commands seemed to have issues with it.)
    var name = parts[0];
    args = parts.slice(1);
    var argList = Utils.encodeJson(args).slice(1, -1);
    var script = context.focusedWindow.document.createElement("script");
    var code = "bespin.get('commandLine').executeCommand('" + fullCommand + "');";
    script.textContent = code;
    context.focusedWindow.document.body.appendChild(script);
  }
});