system-status/system-status.py

from gpiozero import Button
from signal import pause
from subprocess import check_call
from time import sleep
from unicornhatmini import UnicornHATMini

POWER_BUTTON_GPIO_PIN = 5
HOLD_TIME_IN_SECONDS = 1


class SystemStatus:
    def __init__(self, hat):
        self.hat = hat
        self.hat.set_brightness(0.1)

    def display(self):
        self.hat.set(0, 0, 0, 0, 50)
        self.hat.show()

    def terminate(self):
        self.hat.set_all(10, 0, 0)
        self.hat.show()
        sleep(0.25)
        self.hat.set_all(0, 0, 0)
        self.hat.show()
        sleep(0.25)
        self.hat.set_all(10, 0, 0)
        self.hat.show()


def poweroff(systemStatus):
    systemStatus.terminate()
    sleep(1)
    check_call(['sudo', 'poweroff'])


def main():
    systemStatus = SystemStatus(UnicornHATMini())
    powerButton = Button(POWER_BUTTON_GPIO_PIN, hold_time=HOLD_TIME_IN_SECONDS)
    powerButton.when_held = poweroff(systemStatus)
    powerButton.display()
    pause()


if __name__ == '__main__':
    main()