cftun () {
	if [[ -z "$CFTUN_KEY" ]]
	then
		echo "Error: CFTUN_KEY environment variable not set"
		return 1
	fi
	if [[ -z "$1" ]]
	then
		cloudflared tunnel run --token "$CFTUN_KEY"
	elif [[ $1 =~ ^[0-9]+$ ]]
	then
		cloudflared tunnel run --token "$CFTUN_KEY" --url "http://localhost:$1"
	else
		cloudflared tunnel run --token "$CFTUN_KEY" --url "$1"
	fi
}