xrandr wrapper for basic external monitor management

display.sh

#!/usr/bin/bash
# Script to setup external display. Really on meant for setups with
# a laptop display and no more than ONE External display.

# import usage_self() from humanism.sh
if ! type usage_self >/dev/null 2>&1 ; then
  source $HOME/git/humanism.sh/humanism.sh usage_self
fi

ACTIVE=$(xrandr | grep -E " connected (primary )?[1-9]+" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
CONNECTED=$(xrandr | grep " connected " | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
LAPTOP=$(echo "$ACTIVE" | head -1)
OTHER=$(echo "$CONNECTED" | grep -v "$LAPTOP")

case "$1" in
  list)
  # List available display ports and connection status 
	xrandr --query | \
	  egrep 'connected|disconnected' | \
	  awk '{print $1" "$2}' | \
	  sed 's/ connected/ connected <--/' | \
	  egrep --color '\S* '
	;;
  connect)
  # Setup external display args: [left|right|above|below|mirror] [port]
  #   default possition assumed left. 
  #   default port assumed to be first connected monitor other than laptop lcd
  #   eg.
  #    $0 left
  #    $0 VGA1 right
  #    $0 mirror DP1

	#echo -e "ACTIVE:\n$ACTIVE\nCONNECTED:\n$CONNECTED\n"
	#echo -e "LAPTOP:$LAPTOP OTHER:$OTHER\n"

	if [ -z "$OTHER" ]; then
		echo -e "No external connected\nAvailable:"
		$0 list
		exit 1
	fi

	PORT=$(echo "$OTHER" | tail -1)
	POS="--left-of $LAPTOP"

	for arg in "${@:2}"; do
	  case "$arg" in
	    right) POS="--right-of $LAPTOP" ;;
	    above) POS="--above $LAPTOP" ;;
	    below) POS="--below $LAPTOP" ;;
	    mirror) POS="" ;;
	    left) ;;
	    *)
		if echo "$CONNECTED" | grep -q "$arg"; then
		  PORT="$arg"
		else
		  echo "Could not find connected display named \"$arg\""
		  $0 list
		  exit 1
	        fi
		;;
	  esac
	done
	echo "Connecting \"$PORT\" at \"$POS\""
	echo xrandr --output $PORT --auto $POS
	xrandr --output $PORT --auto $POS
	;;
  disconnect)
  # Disconnect display. 
	#xrandr --auto 
	PORT=$(echo "$OTHER" | head -1)
	xrandr --output $PORT --off
	;;

  *)
	usage_self
	;;
esac

exit 0