chutney/chutney.py

import sys

from character_display import CharacterDisplay
from multiprocessing import Event
from multiprocessing import Process
from signal import signal
from signal import SIGTERM
from time import sleep
from time_display import TimeDisplay
from weather_display import WeatherDisplay
from weather_updater import WeatherUpdater

try:
    import unicornhathd as unicorn
    unicorn.rotation(90)
except ImportError:
    from unicorn_hat_sim import unicornhathd as unicorn
    unicorn.rotation(180)


WEATHER_UPDATE_INTERVAL_IN_SECONDS = 60
DISPLAY_UPDATE_INTERVAL_IN_SECONDS = 0.5
CONFIG_FILE = 'chutney.cfg'


def main():
    haltEvent = Event()
    signal(SIGTERM, cleanExit(unicorn, haltEvent))
    unicorn.brightness(0.3)

    weatherThread = Process(target=weatherLoop, args=[haltEvent])
    weatherThread.start()

    characterDisplay = CharacterDisplay(unicorn)
    timeDisplay = TimeDisplay(characterDisplay, topRow=15)
    weatherDisplay = WeatherDisplay(characterDisplay, topRow=9)

    while True:
        timeDisplay.showTime()
        weatherDisplay.showWeather()
        sleep(DISPLAY_UPDATE_INTERVAL_IN_SECONDS)


def weatherLoop(haltEvent):
    weatherUpdater = WeatherUpdater(configFile=CONFIG_FILE)

    while not haltEvent.is_set():
        weatherUpdater.updateWeather()
        haltEvent.wait(timeout=WEATHER_UPDATE_INTERVAL_IN_SECONDS)

    weatherUpdater.clearWeather()


def cleanExit(unicorn, haltEvent):
    def _exit_(signum, frame):
        unicorn.off()
        haltEvent.set()
        sys.exit(0)

    return _exit_


if __name__ == '__main__':
    main()