Source code for caspia.pan.reactive.sun

from caspia import reactive

from .time import time

_sun = None


def register_sun(sun_service):
    global _sun
    _sun = sun_service


def get_sun():
    if _sun is None:
        raise RuntimeError('Sun service not set. Use register_sun().')
    return _sun


def sunrise():
    return reactive.lambda_(lambda dt: (dt.hour, dt.minute), get_sun().sunrise)


def sunset():
    return reactive.lambda_(lambda dt: (dt.hour, dt.minute), get_sun().sunset)


def at_sunrise():
    return reactive.impuls(time == sunrise())


def at_sunset():
    return reactive.impuls(time == sunset())