more elixir metaprogramming

github.ex

defmodule Core.Github do
  @behaviour Core.Github.Adapter

  for {fun, arity} <- Core.Github.Adapter.behaviour_info(:callbacks) do
    args = Macro.generate_arguments(arity, __MODULE__)

    @impl true
    def unquote(fun)(unquote_splicing(args)) do
      apply(adapter(), unquote(fun), unquote(args))
    end
  end

  def adapter() do
    Application.fetch_env!(:core, [Core.Github, :api_adapter])
  end

  @doc """
  Creates a new client with the app token.

  ## Examples
      iex> {:app, %{}} = app_client()
  """
  def app_client(), do: adapter().app_client(Core.Github.JwtToken.generate_and_sign!())
end