fn pub home_directory -> Option[Path] {
  # Rather than performing all sorts of magical incantations to get the home
  # directory, we're just going to require that HOME is set.
  #
  # If the home is explicitly set to an empty string we still ignore it, because
  # there's no scenario in which Some("") is useful.
  match get('HOME') {
    case Ok(v) if v.size > 0 -> Option.Some(Path.new(v))
    case _ -> Option.None
  }
}