Script for fixing the aspect ratio of a wacom table using xsetwacom

set-tablet.sh

#!/bin/bash

set -e

screen_width="$(xrandr | grep current | cut -d ' ' -f 8)"
screen_height="$(xrandr | grep current | cut -d ' ' -f 10 | cut -d , -f 1)"

dev_id="$(xsetwacom list | grep STYLUS | head -n 1 | sed -r 's/^.*id: ([0-9]*) *.*$/\1/')"

xsetwacom set "${dev_id}" ResetArea
device_width="$(xsetwacom get "${dev_id}" Area | cut -d ' ' -f 3)"
device_height="$(xsetwacom get "${dev_id}" Area | cut -d ' ' -f 4)"

new_height="$(echo "${device_width} * ${screen_height} / ${screen_width}" | bc -l | cut -d . -f 1)"
offset=$(( (device_height - new_height) / 2 ))

xsetwacom list | grep -e STYLUS -e ERASER | while IFS="" read -r line || [ -n "$line" ]
do
    dev_id="$(echo "${line}" | sed -r 's/^.*id: ([0-9]*) *.*$/\1/')"
    xsetwacom set "${dev_id}" Area 0 "${offset}" "${device_width}" "$(( new_height + offset ))"
done