Blink(1)/Digispark+RGB Meeting warning light. A script to find your next appointment in your Google Calendar and change the colour of a your device depending on how much time before it starts. Moving from green at 20min (or more) to red in the last 5 mins before a meeting. The light turns blue for the duration of the meeting.

icsBlink.py

#!/usr/bin/python
 
import sys
import getopt
from array import array
import pycurl
import subprocess
import StringIO
from icalendar import Calendar, Event
from datetime import datetime, timedelta

def main(argv):
  try:
    opts, args = getopt.getopt(argv,"bdhu:f:")
  except getopt.GetoptError:
    print 'icsBlink.py -u <URL for calendar>|-f <path to ics file> -b|-d'
    print '-u <URL> - URL pointing to Google calendar'
    print '-f <File> - ICS file'
    print '-b - Use Blink(1)'
    print '-d - Use Digispark + RGB'
    sys.exit(2)
  
  out = 'digi'
  rgb = array('i',[0,200,0])

  for opt, arg in opts:
    if opt == '-h':
      print 'icsBlink.py -u <URL for calendar>|-f <path to ics file> -b|-d'
      print '-u <URL> - URL pointing to Google calendar'
      print '-f <File> - ICS file'
      print '-b - Use Blink(1)'
      print '-d - Use Digispark + RGB'
      sys.exit(1)
    elif opt == '-u':
      curl = pycurl.Curl()
      curl.setopt(pycurl.URL,arg)
      body = StringIO.StringIO()
      curl.setopt(pycurl.WRITEFUNCTION, body.write)
      curl.perform()
      cal = Calendar.from_ical(body.getvalue())
      body.close()
    elif opt == '-f':
      cal = Calendar.from_ical(open(arg,'rb').read())
    elif opt == '-d':
      out = 'digi'
    elif opt == '-b':
      out = 'blink'

 
  now = datetime.now()
 
  offset = 3600
 
  for component in cal.walk():
    if component.name == "VEVENT":
      dtstart = component["dtstart"].to_ical()
      dtend = component["dtend"].to_ical()
      if "T" in dtstart:
        dt = datetime.strptime(dtstart, "%Y%m%dT%H%M%SZ")
        end = datetime.strptime(dtend, "%Y%m%dT%H%M%SZ")
 
        if dt > now:
          delta = dt - now
          if delta.days == 0:
            if delta.seconds < offset:
              offset = delta.seconds
        elif end > now and dt < now:
          offset = -1
          break
 
  if offset > 0 and offset < 300:
    rgb[0] = 200
    rgb[1] = 0
    rgb[2] = 0
  elif offset >= 300 and offset < 600:
    rgb[0] = 150
    rgb[1] = 50
    rgb[2] = 0
  elif offset >= 600 and offset < 900:
    rgb[0] = 100
    rgb[1] = 100
    rgb[2] = 0
  elif offset >= 900 and offset < 1200:
    rgb[0] = 50
    rgb[1] = 150
    rgb[2] = 0
  elif offset == -1:
    rgb[0] = 0
    rgb[1] = 0
    rgb[2] = 200
  else:
    rgb[0] = 0
    rgb[1] = 200
    rgb[2] = 0

  if out == 'blink':
    subprocess.call(['blink1-tool','--rgb','{0},{1},{2}'.format(rgb[0],rgb[1],rgb[2])])
  elif out == 'digi':
    subprocess.call(['DigiRGB.py','{0}'.format(rgb[0]),'{0}'.format(rgb[1]),'{0}'.format(rgb[2])])

if __name__ == "__main__":
  main(sys.argv[1:])

instructions

Add the following your crontab to have the script check your calendar every 5 mins

*/5 * * * * /path/to/icsBlink.py <calendar URL>