well_behaved

defmodule WellBehaved do
  @moduledoc "README.md" |> File.read!() |> String.replace("(#", "(#module-")
  defmacro __using__(_opts) do
    quote do
      Module.register_attribute(__MODULE__, :behave, accumulate: true)
      @before_compile WellBehaved
    end
  end

  defmacro __before_compile__(env) do
    behaviors = Module.get_attribute(env.module, :behave) || []

    for behavior_module <- behaviors do
      quote do
        @behaviour unquote(behavior_module)
      end
    end
  end
end