emuboy/scripts/esc-button.py

#!/usr/bin/env python

from RPi import GPIO
import time
from subprocess import call

GPIO.setmode(GPIO.BCM)
GPIO.setup(3, GPIO.IN)

pressed = False

shutdown = 2.5
press_start = time.time()

while True:
    current = not GPIO.input(3)

    if current and not pressed:
        call(["xdotool", "keydown", "Escape"])
        pressed = True
        press_start = time.time()
    elif not current and pressed:
        call(["xdotool", "keyup", "Escape"])
        pressed = False

    if current:
        if time.time() - shutdown >= press_start:
            call(["sudo", "shutdown", "-h", "now"])

    time.sleep(0.1)