Launch and minimize to tray icon

public/main.js

@@ -4,24 +4,49 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-
+var gui = require('nw.gui');
 var linewidth = 48;
 var devtype = "epson";
 var device = "/dev/usb/lp0";
+var settingsValid = true;
+var win = gui.Window.get();
+var tray = new nw.Tray({
+    title: 'NickelBridge',
+    tooltip: 'Open NickelBridge configuration',
+    icon: 'public/assets/img/logo_64.png'
+});
 
 function loadSettings() {
     if (localStorage.getItem("linewidth") !== null && Number.parseInt(localStorage.getItem("linewidth")) != Number.NaN) {
         linewidth = Number.parseInt(localStorage.getItem("linewidth"));
+    } else {
+        settingsValid = false;
     }
     if (localStorage.getItem("devtype") !== null) {
         devtype = localStorage.getItem("devtype");
         if (devtype != "epson" && devtype != "star") {
             devtype = "epson";
+            settingsValid = false;
         }
+    } else {
+        settingsValid = false;
     }
-    if (localStorage.getItem("device") !== null) {
+    if (localStorage.getItem("device") !== null && localStorage.getItem("device") != "") {
         device = localStorage.getItem("device");
+    } else {
+        settingsValid = false;
     }
 }
 
-loadSettings();
+loadSettings();
+
+win.on('minimize', function () {
+    win.hide();
+});
+tray.on('click', function () {
+    win.show();
+});
+
+if (settingsValid === true) {
+    win.hide();
+}