#!/bin/bash
#
# Switch Display input on screen change  (DELL 24" monitor specific)
# by John Ryland
# Copyright 2018
#

# This can be made to be run by lightdm before login - see the install script

echo "Switcher started" > /tmp/switcher.log
echo "Synergy started" > /tmp/synergy.log

# Needs to be run with sudo so that it can control the monitor
# (this happens if allow it to be run by lightdm, see the install script)

# Run synergy client where output goes to console so can monitor for screen changes
LAST_LINE=
synergyc -f -d INFO 192.168.1.112 2>&1 | while read LINE
do
  if echo $LINE | grep -q "leaving screen"
  then
    if [ "$LAST_LINE" != "$LINE" ]
    then
      # Send a DDC command to the monitor (This is specific for the specific DELL monitor)

      # ddccontrol -r 0x60 -w 18 dev:/dev/i2c-4 2&>1 > /dev/null
      
      echo "Switching --$LINE--" >> /tmp/switcher.log
      LAST_LINE=$LINE
    fi
  fi
  echo $LINE >> /tmp/synergy.log
done