   case .button:
     print("button")
     var counter = 0
-    while(counter < 10) {
+    while counter < 10 {
       guard let value = button?.value else { return }
       if value == 0 {
         counter += 1

import SwiftGPIOLibrary

enum Command: Int {
case one
case two
case blink
case button
}

guard CommandLine.arguments.count == 2 else {

  // Setup pin 18 as input
  let button = setupIN(ports: [.P18], for: .RaspberryPi2)[.P18]

  switch led {
  case .one:
    print("one")
    gpios[.P20]?.value = 1
