Toggle built-in laptop keyboard on/off on Linux while using external keyboard on top of laptop

keyboard-toggle.sh

#!/usr/bin/env bash

set -euo pipefail

# Map hostname to its internal keyboard name.
# Find name with: xinput list
declare -A keyboards=( ["my-hostname"]="AT Translated Set 2 keyboard" )

id=0
host=$(hostname)

log() {
  logger -s "${BASH_SOURCE}" "$@"
}

if [[ -v keyboards[$host] ]]; then
  name="${keyboards[$host]}"
  id=$(xinput list | grep "${name}" | cut -f2 | cut -f2 -d=)
  log "Found keyboard '${name}' on host '${host}': id=${id}"
fi

if [ "${id}" = "0" ]; then
  notify-send "No toggleable keyboard found"
  exit
fi

enabled=$(xinput list-props "${id}" | grep "Device Enabled" | cut -f3)

if [ "${enabled}" = "0" ]; then
  notify-send "Enabling keyboard..." \ "ON - keyboard connected";
  log "Enabling keyboard '${name}'"
  xinput enable "${id}"
elif [ "${enabled}" = "1" ]; then
  notify-send "Disabling Keyboard" \ "OFF - keyboard disconnected";
  log "Disabling keyboard '${name}'"
  xinput disable "${id}"
else
  log "Unknown keyboard state: ${enabled}"
  exit 1
fi