tdhopper/moon

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import datetime as dt
import twitter as tw
import os

# Adapted the moon phase code from
# http://smithje.github.io/bash/2013/07/08/moon-phase-prompt.html


def julian(year, month, day):
    a = (14 - month) / 12.0
    y = year + 4800 - a
    m = (12 * a) - 3 + month
    return (
        day + (153 * m + 2) / 5.0 + (365 * y) + y / 4.0 - y / 100.0 + y / 400.0 - 32045
    )


def phase(year=None, month=None, day=None):
    if year is None and month is None and day is None:
        today = dt.datetime.now()
        today -= dt.timedelta(days=1) # 2020 leap day correction
        year, month, day = today.year, today.month, today.day
    p = (julian(year, month, day) - julian(2000, 1, 6)) % 29.530588853

    if p < 1.84566:
        return "🌑"  # new
    elif p < 5.53699:
        return "🌒"  # waxing crescent
    elif p < 9.22831:
        return "🌓"  # first quarter
    elif p < 12.91963:
        return "🌔"  # waxing gibbous
    elif p < 16.61096:
        return "🌕"  # full
    elif p < 20.30228:
        return "🌖"  # waning gibbous
    elif p < 23.99361:
        return "🌗"  # last quarter
    elif p < 27.68493:
        return "🌘"  # waning crescent
    else:
        return "🌑"  # new


def tweet(event, context):
    credentials = {
        "consumer_key": os.environ["CONSUMER_KEY"].strip(),
        "consumer_secret": os.environ["CONSUMER_SECRET"].strip(),
        "token": os.environ["TOKEN"].strip(),
        "token_secret": os.environ["TOKEN_SECRET"].strip(),
    }
    auth = tw.OAuth(**credentials)
    t = tw.Twitter(auth=auth)
    t.statuses.update(status=phase())


if __name__ == "__main__":
    print(phase())