trackpad-watcher.sh

#!/usr/bin/env bash

TRACKPOINT_NAME="DualPoint Stick"
TRACKPAD_NAME="AlpsPS/2 ALPS GlidePoint"
POLL_INTERVAL=1.0s

point_xid=$(xinput --list --id-only "$TRACKPOINT_NAME")
pad_xid=$(xinput --list --id-only "$TRACKPAD_NAME")

is_enabled() {
    en=$(xinput --list-props "$1" | grep -i Enabled | awk '{print $4}')
    [ $en = '1' ]
}

in_use() {
    node=$(xinput --list-props "$1" | grep -i "Device Node" | awk '{print $4}')
    node="${node%\"}"
    node="${node#\"}"
    timeout $POLL_INTERVAL xxd -p -l 1 $node > /dev/null
}

trap "exit" INT
while true; do
        
    if in_use $point_xid; then
        # TrackPoint is in use
        if is_enabled $pad_xid; then
            # TrackPad is Enabled
            xinput --disable $pad_xid
        fi
        sleep $POLL_INTERVAL
    else
        # TrackPoint is not in use
        if ! is_enabled $pad_xid; then
            # TrackPad is not enabled
            xinput --enable $pad_xid
        fi
    fi

done