#!/bin/bash
set -eu

url="$(curl -s "$1" | \
        xmlstarlet sel    -T -N atom="http://www.w3.org/2005/Atom" \
        -t -m '//atom:link[@rel="enclosure"]'   -v @href -n  | \
        head -n 1 )"
test -z "$url" && exit 1
out="$(mktemp "--tmpdir=$TMPDIR" podcast-XXXXXXXX.ogg)"
trap 'rm -f "$out"' EXIT
wget -q "$url" -O "$out"
echo "file://$(realpath "$out")"
exit 0