Remap buttons in Kensington Expert Mouse

#!/usr/bin/env bash

# 1 "Button Left"
# 2 "Button Middle"
# 3 "Button Right"
# 4 "Button Wheel Up"
# 5 "Button Wheel Down"
# 6 "Button Horiz Wheel Left"
# 7 "Button Horiz Wheel Right"
# 8 "Button Side"
# 9 "Button Extra"

# The trackball has the following keys by default
# ░░░░░░░░░░░░░
# ░╔════╤════╗░
# ░║░2░░│░░8░║░
# ░║░░░▄▄▄░░░║░
# ░╟───███───╢░
# ░║░░░▀▀▀░░░║░
# ░║░1░░│░░3░║░
# ░╚════╧════╝░
# ░░░░░░░░░░░░░

mouse_name="Kensington Expert Mouse"

check=$(xinput | grep "$mouse_name")

if [[ ! -z "$check" ]]; then
    mouse_id=$(xinput | grep "$mouse_name" | sed "s/^.*id=\([0-9]*\)[ \t].*$/\1/")
    echo "Device $mouse_id found"

    # Trackball button 1 will generate click 8 ("Button Side" interpreted as back)
    # Trackball button 2 will generate click 1 ("Button Left")
    # Trackball button 3 will generate click 9 ("Button Extra" interpreted as forward)
    # Trackball button 8 will generate click 3 ("Button Right")
    xinput set-button-map $mouse_id 8 1 9 4 5 6 7 3 2

    # we might want to enable better scrolling
    # xinput set-prop $mouse_id "libinput Natural Scrolling Enabled" 1

    # disable acceliration for the ball
    # xinput set-prop $mouse_id "libinput Accel Profile Enabled" 0, 1

    # allow scrolling by holding middle mouse button and using the ball to scroll ( really smooth and fast ).
    # xinput set-prop $mouse_id "libinput Scroll Method Enabled" 0, 0, 1

    # allow the remmaped middle mouse to be used for middle mouse scroll
    # xinput set-prop $mouse_id "libinput Button Scrolling Button" 3
fi