Macro to catch errors

report.ex

defmodule Report do
  defmacro __using__(_opts) do
    quote do
      import Report
    end
  end

  defmacro dispatch(name, do: block) do
    function_name = String.to_atom(name)

    IO.inspect(block)
    {:with, _, params} = block

    with_else =
      params
      |> List.last()
      |> Keyword.put(:else,
    quote do
      error -> error
    end)

    params = List.replace_at(params, 1, with_else)

    block =
      block
      |> Tuple.delete_at(2)
      |> Tuple.insert_at(2, params)
    IO.inspect(block)

    quote do
      def unquote(function_name)() do
        unquote(block)
      end
    end
  end
end

defmodule Request do
  use Report

  dispatch "get_level" do
    with {:ok, value} <- test() do
      value
    end
  end

  defp test do
    {:error, "n funfou"}
  end
end