defmodule Dec.Pipeline do
      # of macros

  def split({:|>, _, _} = ppln) do
    split(ppln, [])
  end

  def split({:|>, opts, [first, second]}, result) do
    split(first, [{opts, second} | result])
  end

  def split({:@, _, [{:dec, _, _} = dec]}, result) do
    {dec, result}
  end

  def combine([], result) do
    result
  end

  def combine(elements, result) do
    [{opts, value} | elements] = elements
    combine(elements, {:|>, opts, [result, value]})
  end

end