# If an external monitor is connected, place it with xrandr

function determineLocation() {
  local extLoc=$1
  local intOut=$2

  case "$extLoc" in
    left|LEFT) 
      OPTIONS="--left-of $intOut"
      ;;
    right|RIGHT)
      OPTIONS="--right-of $intOut"
      ;;
    top|TOP|above|ABOVE)
      OPTIONS="--above $intOut"
      ;;
    bottom|BOTTOM|below|BELOW)
      OPTIONS="--below $intOut"
      ;;
    *)
      OPTIONS="--above $intOut"
      ;;
  esac
}

function setupMonitor() {
  local intOut=$1
  local extOut=$2
  local options=$3

  xrandr | grep $extOut | grep " connected "

  if [ $? -eq 0 ]; then
    #printf "INTERNAL_OUTPUT: %s, EXTERNAL_OUTPUT: %s, OPTIONS: %s\n" "$intOut" "$extOut" "$options"
    xrandr --output $intOut --auto --output $extOut --auto $options
    # Alternative command in case of trouble:
    # (sleep 2; xrandr --output $intOut --auto --output $extOut --auto $options) &
  else
    #printf "INTERNAL_OUTPUT: %s, OPTIONS: %s\n" "$intOut" "$options"
    xrandr --output $intOut --auto --output $options --off
  fi
}


INTERNAL_OUTPUT="LVDS1"

# External output may be "VGA" or "VGA-0" or "DVI-0" or "TMDS-1"
EXTERNAL_OUTPUT="VGA1"
# EXTERNAL_LOCATION may be one of: left, right, above, or below
EXTERNAL_LOCATION="above"

determineLocation "$EXTERNAL_LOCATION" "$INTERNAL_OUTPUT"
setupMonitor "$INTERNAL_OUTPUT" "$EXTERNAL_OUTPUT" "$OPTIONS"

# External output may be "VGA" or "VGA-0" or "DVI-0" or "TMDS-1"
EXTERNAL_OUTPUT="HDMI1"
# EXTERNAL_LOCATION may be one of: left, right, above, or below
EXTERNAL_LOCATION="right"

determineLocation "$EXTERNAL_LOCATION" "$INTERNAL_OUTPUT"
setupMonitor "$INTERNAL_OUTPUT" "$EXTERNAL_OUTPUT" "$OPTIONS"