Automatic record macro for Elixir

auto_records.ex

defmodule AutoRecords do

  defmacro __using__(_opts) do
    quote do
      require OpenTelemetry.Records.Auto
      import OpenTelemetry.Records.Auto, only: [auto_record: 2]
    end
  end

  defmacro auto_record(name, from_lib) do
    quote do
      require Record

      @structfields Record.extract(unquote(name), from_lib: unquote(from_lib))
      Record.defrecordp(unquote(name), @structfields)
      defstruct @structfields

      @spec from(record(unquote(name))) :: %__MODULE__{}
      def from(rec) when Record.is_record(rec, unquote(name)) do
        fields = unquote(name)(rec)
        struct!(__MODULE__, fields)
      end
    end
  end
end