define apt::ppa (
  $key,
  $ensure = present,
  $ppa    ='ppa'
) {

  apt::key {$key:
    ensure => $ensure,
  }

  $ppa_name = inline_template("<%=
    if ppa.is_a?(Array)
      ppa.join('-')
    else
      ppa
    end %>")

  apt::sources_list {"${name}-${ppa_name}-${lsbdistcodename}":
    ensure  => $ensure,
    content => template('apt/ppa-list.erb'),
  }

}