Make xorg connection optional

desktop_unix.go

@@ -48,38 +48,35 @@ var (
 	ErrNoClass = errors.New("empty class")
 )
 
-func Connect(display string) Xorg {
+func Connect(display string) (*Xorg, error) {
 	var x Xorg
 	var err error
 
 	x.conn, err = xgb.NewConnDisplay(display)
 	if err != nil {
-		log.Fatal("xgb:", err)
+		return nil, err
 	}
 
 	x.util, err = xgbutil.NewConnDisplay(display)
 	if err != nil {
-		log.Fatal(err)
+		return nil, err
 	}
 
-	err = screensaver.Init(x.conn)
-	if err != nil {
-		log.Fatal("screensaver:", err)
+	if err := screensaver.Init(x.conn); err == nil {
+		drw := xproto.Drawable(x.root)
+		screensaver.SelectInput(x.conn, drw, screensaver.EventNotifyMask)
 	}
 
 	setup := xproto.Setup(x.conn)
 	x.root = setup.DefaultScreen(x.conn).Root
 
-	drw := xproto.Drawable(x.root)
-	screensaver.SelectInput(x.conn, drw, screensaver.EventNotifyMask)
-
 	x.activeAtom = x.atom("_NET_ACTIVE_WINDOW")
 	x.netNameAtom = x.atom("_NET_WM_NAME")
 	x.nameAtom = x.atom("WM_NAME")
 	x.classAtom = x.atom("WM_CLASS")
 
 	x.spy(x.root)
-	return x
+	return &x, nil
 }
 
 func (x Xorg) Close() {

main.go

@@ -15,12 +15,13 @@ import (
 )
 
 var (
-	dev      streamdeck.Device
+	dev  streamdeck.Device
+	deck *Deck
+
 	dbusConn *dbus.Conn
 	keyboard uinput.Keyboard
-	x        Xorg
 
-	deck          *Deck
+	xorg          *Xorg
 	recentWindows []Window
 
 	deckFile   = flag.String("deck", "deckmaster.deck", "path to deck config file")
@@ -79,11 +80,12 @@ func main() {
 		log.Fatal(err)
 	}
 
-	x = Connect(os.Getenv("DISPLAY"))
-	defer x.Close()
-
 	tch := make(chan interface{})
-	x.TrackWindows(tch, time.Second)
+	xorg, err = Connect(os.Getenv("DISPLAY"))
+	if err == nil {
+		defer xorg.Close()
+		xorg.TrackWindows(tch, time.Second)
+	}
 
 	d, err := streamdeck.Devices()
 	if err != nil {

widget_recent_window.go

@@ -37,7 +37,12 @@ func (w *RecentWindowWidget) Update(dev *streamdeck.Device) {
 }
 
 func (w *RecentWindowWidget) TriggerAction() {
+	if xorg == nil {
+		log.Println("xorg support is disabled!")
+		return
+	}
+
 	if int(w.window) < len(recentWindows) {
-		x.RequestActivation(recentWindows[w.window])
+		xorg.RequestActivation(recentWindows[w.window])
 	}
 }