rotate

#!/bin/bash -e
# 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 -E 'LVDS-?1')"
    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 [[ $# -ne 1 ]]; then
    echo "Usage:"
    echo "  $(basename $0) <clockwise|counter-clockwise|normal|inverted|left|right>"
    exit 1
fi

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