#!/usr/bin/python

import RPi.GPIO as GPIO
import time
import os

buttonShutdown = 6
button9x9 = 13
buttonNext = 19
buttonPrev = 26

GPIO.setmode(GPIO.BCM)
GPIO.setup(buttonShutdown, GPIO.IN)
GPIO.setup(button9x9, GPIO.IN)
GPIO.setup(buttonNext, GPIO.IN)
GPIO.setup(buttonPrev, GPIO.IN)

GPIO.add_event_detect(buttonShutdown, GPIO.FALLING)
GPIO.add_event_detect(button9x9, GPIO.FALLING)
GPIO.add_event_detect(buttonNext, GPIO.FALLING)
GPIO.add_event_detect(buttonPrev, GPIO.FALLING)

while True:
  if GPIO.event_detected(buttonShutdown):
    cmd = "echo shutdown"
    os.system(cmd)
  if GPIO.event_detected(button9x9):
    cmd = "echo 9x9"
    os.system(cmd)
  if GPIO.event_detected(buttonNext):
    cmd = "echo next"
    os.system(cmd)
  if GPIO.event_detected(buttonPrev):
    cmd = "echo prev"
    os.system(cmd)
  time.sleep(0.1)