Sync Philips Hue light temperature with redshift

huetemp.py

#!/usr/bin/env python

from __future__ import print_function

import phue
import re
import subprocess
import sys

import logging
logging.basicConfig()

redshift_output = subprocess.check_output(['redshift', '-p'])
for line in redshift_output.splitlines():
	if not line.startswith('Color temperature:'):
		continue
	result = re.search(r'([0-9]+)K', line)
	if result is None:
		print("Couldn't get colour temperature", file=sys.stderr)
		sys.exit(1)

	temperature = int(result.group(1))
	break

miren = float(1e6) / temperature

bridge = phue.Bridge('hue')
print("Setting lights to colour temperature %dK (%g miren)" % (temperature, miren))
for light in bridge.lights:
	if not light.on or light.colormode != 'ct':
		print('skipping %s' % light.name)
		continue
	light.colortemp_k = temperature