fn.readcountdown

readcountdown1 () {
	if [[ "$#" -lt 3 ]]; then
		cat <<-EOT
			Accepts a single char of user input
			Usage: readcountdown1 seconds variable message
			Ex: readcountdown1 5 inp '(d)elete (anything else exits)'
			gives 5 seconds and sets inp if anything (even enter) entered
			returns 0 on success, 1 for timeout
		EOT
		return 1
	fi
	local secs="$1"
	local var="$2"
	local msg="$3"
	local uinp
	for ((i=secs; i>0; i--)); do
		unset "$var"
		if ! read -r -n 1 -t 1 -p "$msg (${i}s): " uinp; then
			echo -ne '\r'
		else
			if [[ "$uinp" != '' ]]; then echo; fi # for enter
			eval "export $var='$uinp'"
			return 0
		fi
	done
	if [[ "$i" -lt 1 ]]; then echo; fi
	return 1
}