#!/bin/sh

help() {
cat << EOF
${0}: Disable and Enable devices

options:
 -e [dev] 	Enable dev
 -d [dev]	Disable dev
 -t [dev]	Toggle dev
 -l 		List devices
 -h 		Print this message and exit

Note: Nondescriptive inputs may disable (or enable) unwanted devices.
EOF
}

err() {
	for line in "${@}"; do
		echo "${line}" >&2
	done
	exit 1
}

get_id() {
	if ! dev=$(xinput list --name-only | grep -i -m1 "${1}" ); then
		err "${0}: Couldn't get device"
	fi
	id="${dev#∼ }"
}

xenable() {
	echo "${id}"

	if ! xinput enable "${1}" > /dev/null 2>&1; then
		err "${0}: Failed to enable dev."
	else
		exit 0
	fi
}

xdisable() {
	echo "${id}"

	if ! xinput disable "${1}" > /dev/null 2>&1; then
		err "${0}: Failed to disable dev."
	else
		exit 0
	fi
}

if ! command -v xinput > /dev/null 2>&1; then
	err "${0}: xinput must be installed"
fi

while getopts "e:d:t:lh" option; do
	case "${option}" in
	e) get_id "${OPTARG}"; xenable "${id}" ;;

	d) get_id "${OPTARG}"; xdisable "${id}" ;;

	t)
		get_id "${OPTARG}"

		[ "${id}" = "${dev}" ] && xdisable "${id}"
		xenable "${id}"
	;;
	l)
		if ! xinput list 2>/dev/null; then
			err "${0}: Listing Failed"
		else 
			exit 0
		fi
	;;
	h) help; exit ;;

	*) err "Try '${0} -h' for help." ;;

	esac
done

err "${0}: Invalid usage" "Try '${0} -h' for help."