#!/bin/sh

usage() {
    echo "usage: gpotp KEY-NAME"
}

set -e
while getopts h opt; do
    case "$opt" in
	h)
	    usage
	    exit 0
	    ;;
	*)
	    usage >&2
	    exit 1
	    ;;
    esac
done
shift $((OPTIND - 1))
if [ $# -lt 1 ]; then
    usage >&2
    exit 1
fi

if ! echo "$1" | grep -q /; then
    key="$HOME/passwd/otp/$1.gpg"
else
    key="$1"
fi
if [ ! -e "$key" ]; then
    echo "gpotp: $key: does not exist" >&2
    exit 1
fi

gpg --quiet --decrypt --armor <"$key" | (
    read type secret dig
    oathtool "--$type" -d "$dig" "$secret"
)