defmodule KeySigil do
  defmacro sigil_K({:<<>>, _meta, [keys|_]}, _modifiers) do
    keys
    |> String.split(" ")
    |> Enum.map(&String.to_atom/1)
    |> Enum.reverse
    |> Enum.reduce(quote(do: []), &addition/2)
  end

  defp addition(key, acc) do
    quote bind_quoted: [acc: acc, key: key, value: Macro.var(key, nil)] do
      acc |> Keyword.put(key, value)
    end
  end
end