#!/bin/bash

latestVersion="$(\
  curl "http://lilypond.org/downloads/sources/" 2> /dev/null | \
    tr "\"/" "\n\n" | \
    grep "^v[[:digit:]]\+\.[[:digit:]]\+\$" | \
    sed "s/^v//" | \
    sort -V | \
    tail -n1)"

curl "http://lilypond.org/downloads/sources/v${latestVersion}/" 2> /dev/null | \
  tr "\"/" "\n\n" | \
  grep "^lilypond-${latestVersion}\.[[:digit:]]\+\.tar\.gz\$" | \
  sed "s/^lilypond-\([[:digit:]]\(\.[[:digit:]]\+\)*\)\.tar\.gz\$/\1/" | \
  sort -V | \
  tail -n1