rotate-screen.sh

#!/bin/bash

# Usage: rotate-screen [absolute] [action]
#
# ACTIONS:
#   flip|invert - invert the screen from the current rotation
#   left        - rotate to the left
#   right       - rotate to the right
#
# OPTION:
#   absolute - this forces the rotation to be relative to "normal" rotation vs current

: ${output:="LVDS1"}
: ${default_rotation:="normal"}

cr=$(xrandr -q |grep " connected" | awk '{print $4}' | cut -b 1)
case $cr in
  l) current_rotation="left" ;;
  r) current_rotation="right" ;;
  i) current_rotation="inverted" ;;
  *) current_rotation="normal" ;;
esac

# Act like we are in normal mode so the switch will go to the default rotation
if [[ "$1" = "absolute" ]] ; then
  current_rotation="normal"
  shift
fi

case "$1" in
flip|inverted|invert)
  case "$current_rotation" in
    left) rotation="right" ;;
    right) rotation="left" ;;
    normal) rotation="inverted" ;;
    #inverted) rotation="normal" ;;
    *) rotation="normal" ;;
  esac
  ;;
upsidedown|forfriend|look)
  rotation="inverted"
  ;;
left)
  case "$current_rotation" in
    left) rotation="inverted" ;;
    inverted) rotation="right" ;;
    right) rotation="normal" ;;
    *) rotation="left" ;;
  esac
  ;;
right)
  case "$current_rotation" in
    right) rotation="inverted" ;;
    inverted) rotation="left" ;;
    left) rotation="normal" ;;
    *) rotation="right" ;;
  esac
  ;;
*)
  rotation="normal"
  ;;
esac


xrandr --output "$output" --rotate "$rotation"