Turns off wemo devices when computer monitor is off

desktop-led.sh

#!/bin/bash
################################################################################
################################################################################
# Name:        desktop-led.sh
# Usage:
# Description: Turns off Desktop lights when monitors is off
# Created:
# Copyright 2014, Victor Mendonca - http://victormendonca.com
#                                 - https://github.com/victorbrca
# License: Released under the terms of the GNU GPL license v3
################################################################################
################################################################################


#-------------------------------------------------------------------------------
# Sets variables
#-------------------------------------------------------------------------------
# Create the folder ${HOME}/bin/var/log
runfolder="${HOME}/bin"
log=${runfolder}/var/log/desktop-led.log

# Download wemo_control.sh from my gists
if [[ ! -x "${runfolder}/devices/wemo_control.sh" ]] ; then
  echo "We need ${runfolder}/devices/wemo_control.sh for this script"
  exit 1
fi

# Change below to the IP address of your Wemo devices
devices="192.168.1.3 192.168.1.2"

#-------------------------------------------------------------------------------
# Functions
#-------------------------------------------------------------------------------

_getMonitorStatus () {
  monitor_status=$(xset -q | grep Monitor | awk '{print $3}')
  if [[ ! "$monitor_status" ]] ; then
    echo "Could not set status"
    exit 1
  fi
}

_turnOffLights () {
  for device in $devices ; do
    ./wemo_control.sh "$device" off
  done
}

_turnOnLights () {
  for device in $devices ; do
    ./wemo_control.sh "$device" on
  done
}

_actOnStatus () {
  case $monitor_status in
    On) _turnOnLights ;;
    Off) _turnOffLights ;;
  esac
}


#-------------------------------------------------------------------------------
# Starts script
#-------------------------------------------------------------------------------

while true ; do
  _getMonitorStatus
  if [[ "$current_status" ]] ; then
    if [[ "$current_status" != "$monitor_status" ]] ; then
      _actOnStatus
    fi
  else
    _actOnStatus
  fi
  current_status="$monitor_status"
  sleep 2
done