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#!/bin/bash
if [ "a$1" == "a-h" ] || [ "a$1" == "a--help" ]; then
cat <<EOF
Usage: $0
Reads a single key from stdin and parses some key codes such as arrow keys and enter.
EOF
fi
read -rsN1 key
read -rsN1 -t 0.0001 k1
read -rsN1 -t 0.0001 k2
read -rsN1 -t 0.0001 k3
key+="${k1}${k2}${k3}"
case "$key" in
$'\e[A' | $'\e0A')
echo up
;;
$'\e[D' | $'\e0D')
echo left
;;
$'\e[B' | $'\e0B')
echo down
;;
$'\e[C' | $'\e0C')
echo right
;;
$'\n')
echo enter
;;
*)
echo "$key"
;;
esac
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