exercise.exs

@proto_version "1.0"

def process_options(opts) do
  ret = Enum.reduce(opts, [], fn
    {:in, _}, ret -> ["-in"|ret]
    {:err, :out}, ret -> ["-err", "out"|ret]
    {:err, :err}, ret -> ["-err", "err"|ret]
    {:dir, dir}, ret -> ["-dir", dir|ret]
    _ -> ret
  end)
    
  ret = case :application.get_env(:porcelain, :goon_driver_log) do
    :undefined -> ret
    {:ok, val} -> ["-log", val|ret]
  end

  ["-proto", @proto_version|ret]
end