2020/day04-1.sh


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#!/bin/sh
valid=0
validate() {
	[ \
		-n "${byr}" -a \
		-n "${iyr}" -a \
		-n "${eyr}" -a \
		-n "${hgt}" -a \
		-n "${hcl}" -a \
		-n "${ecl}" -a \
		-n "${pid}" \
	] && valid=$((valid + 1))
	unset byr iyr eyr hgt hcl ecl pid cid
}
while :; do
	read -r line
	last=$?
	if [ -n "${line}" ]; then
		for pair in $line; do
			var=${pair%:*}
			val=${pair#*:}
			eval "${var}=${val}"
		done
	else
		validate
	fi
	[ $last -ne 0 ] && break
done
validate
echo $valid