#!/bin/sh
set -e

str isvalue "$1" \
		&& printf "Usage: %s\n" "$0" 1>&2 \
		&& exit 64 \
|| str isvalue "$PIGPEN" \
		&& printf "%s\n" "$PIGPEN" \
		&& exit 0 \
	|| str isvalue "$XDG_CONFIG_HOME" \
		&& printf "%s\n" "$XDG_CONFIG_HOME" \
		&& exit 0 \
	|| printf "%s/.pigpen\n" "$HOME" \
		&& exit 0 \
	|| exit 1