bash script to set multiple monitors with xrandr (generic approach)

monitorRight.sh

#!/bin/bash
# simple script that either connects or disconnects the external monitor
# the prime output is the local (laptop) screen
# the secondary is either discovered,but not connected or disconnected but not removed (screen size too big)

oldifs="$IFS"
IFS=$'\n'
export DISPLAY=:0.0
#sleep 2

stuff="$(/usr/bin/xrandr -q)"
echo "($stuff)"
#sometimes not primary???
#primeOutput=($(xrandr | grep -E " connected [1-9]+" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/"))
#either 'connected primary 1440.. or connected primary (normal
primeOutput=$(echo "$stuff" | grep -E " connected primary [1-9(]+" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
if [[ -z $primeOutput ]]; then
#we can't check for the real primary monitor if mirrored
  #primeOutput=$(echo "$stuff" | grep -E " connected [1-9]+[0-9x]+[+][0]" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
  monitors=$(echo "$stuff" | grep -E " connected [1-9]+" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
  monArray=($monitors)
  primeOutput="${monArray[0]}" 
  secondaryAttached="${monArray[1]}"
  echo "fallback"
else
  secondaryAttached=($(echo "$stuff" | grep -E " connected [0-9]+x"| sed -e "s/\([A-Z0-9]\+\) connected.*/\1/"))
fi

#secondaryAttached=$(echo "$stuff" | grep -E " connected [0-9x]+[0-9x]+[+][1-9]"| sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
secondaryFound=($(echo "$stuff" | grep " connected (" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/"))
#secondaryDisonnected=$(echo "$stuff" | grep -E " disconnected [1-9]+" | sed -e "s/\([A-Z0-9]\+\) disconnected.*/\1/")
secondaryDisconnected=($(echo "$stuff" | grep -E " disconnected " | sed -e "s/\([A-Z0-9]\+\) disconnected.*/\1/"))


echo "primary: ${primeOutput}"
echo "External discovered: ${#secondaryFound[@]}= "${secondaryFound[*]}
echo "External already attached: ${#secondaryAttached[@]} = "${secondaryAttached[*]}
echo "External to disconnect: ${#secondaryDisconnected[@]} = "${secondaryDisconnected[*]}

logger "Monitors: ${primeOutput} EXT: pending:"${secondaryFound[*]}" connected:"${secondaryAttached[*]}" disconnect:"${secondaryDisconnected[*]}


if [[ -n $secondaryFound ]]; then
  for (( i=0; i<${#secondaryFound[@]}; i++ )) do
    echo "Connecting ${secondaryFound[i]}"
    xrandr --output $primeOutput --auto --primary --output ${secondaryFound[i]} --auto --right-of $primeOutput
  done
fi

if [[ -n $secondaryDisconnected ]]; then
  for (( i=0; i<${#secondaryDisconnected[@]}; i++ )) do
    echo "Disconnecting ${secondaryDisconnected[i]} "
    xrandr --output $primeOutput --auto --output ${secondaryDisconnected[i]} --off
  done
fi

if [[ -n $secondaryAttached ]]; then
  for (( i=0; i<${#secondaryAttached[@]}; i++ )) do
     echo "enforce layout to attached: ${secondaryAttached[i]}"
     xrandr --output $primeOutput --auto --primary --output ${secondaryAttached[i]} --auto --right-of $primeOutput
  done
fi
IFS="$oldifs"