rotate

#!/bin/bash
# Rotate the Microsoft Surface Pro touchscreen input
# Usage: rotate [clockwise|counter-clockwise|normal|inverted|left|right]
# The script will rotate the screen clockwise by default

matrix() {
	declare -A dict=(
		["normal"]="1 0 0 0 1 0 0 0 1"
		["inverted"]="-1 0 1 0 -1 1 0 0 1"
		["left"]="0 -1 1 1 0 0 0 0 1"
		["right"]="0 1 0 -1 0 1 0 0 1"
	)
	echo "${dict["$1"]}"
}
rotate() {
	M=$(matrix "$1")
	PROP='Coordinate Transformation Matrix'
	DEVICES=$(pointerID)
	xrandr -o $1
	for id in $DEVICES; do xinput set-prop $id "$PROP" $M; done;
	notify-send \
	"The system's display and touch-screen input have been rotated to $1" \
	"Pointer device ID(s): $(echo $DEVICES | tr ' ' '\n' | sort -n | \
	sed ':a;N;$!ba;s/\n/, /g')"
}
clockwise() {
	declare -A dict=(
		["normal"]="right"
		["inverted"]="left"
		["left"]="normal"
		["right"]="inverted"
	)
	echo "${dict["$1"]}"
}
counterClockwise() {
	declare -A dict=(
		["normal"]="left"
		["inverted"]="right"
		["left"]="inverted"
		["right"]="normal"
	)
	echo "${dict["$1"]}"
}
currentRotation() {
	INFO="$(xrandr -q --verbose | grep LVDS1)"
	if [ "$(echo $INFO | cut -d' ' -f 3)" = "primary" ];
	then
		echo "$(echo $INFO | cut -d' ' -f 6)"
	else
		echo "$(echo $INFO | cut -d' ' -f 5)"
	fi
}
pointerID() {
	echo "$(xinput --list | grep pointer | cut -f 2 | cut -d= -f 2)"
}

if [ "$1" = "" ] || [ "$1" = "clockwise" ];
then
	rotate "$(clockwise "$(currentRotation)")"
elif [ "$1" = "counter-clockwise" ];
then
	rotate "$(counterClockwise "$(currentRotation)")"
else
	rotate "$1"
fi