defmodule Processor.Source do
  # [upgrade] use Saxy.parse_stream, and file i/o streams.
  def read(glob, parser) do
    glob
    |> Path.wildcard()
    |> Enum.map(&File.read!/1)
    |> map_xml(parser)
  end

  # [upgrade] use Saxy.parse_stream, and file i/o streams.
  # sources: an enumerable of xml strings
  # parser: a Saxy.XML parser
  def map_xml(sources, parser) do
    sources
    |> Enum.map(fn source -> Task.async(fn ->
      {:ok, refs} = source |> Saxy.parse_string(parser, [])
      refs |> Enum.reverse
    end) end)
    |> Task.await_many()
  end
end