No. Because those macros are not necessarily used just by the top level mix application (if there even is one).

Yup, I’m gonna just do this, and change it later if a better solution arises.

The problem is that this is library code, that is supposed to look into your project, but also, other libraries, so it’s a no-no, to need to adhere to that standard.

For now goes like this:

app_name = find_app_name(env.file)

...

  def find_app_name(module_file) when is_binary(module_file) do
    module_file |> Path.dirname() |> find_app_name_in_dir()
  end

  defp find_app_name_in_dir(dir) do
    {:ok, files} = File.ls(dir)

    if "mix.exs" in files do
      mix_file = Path.join(dir, "mix.exs")
      {:ok, content} = File.read(mix_file)

      case Regex.named_captures(~r/app: :(?<app_name>[a-z_]+),*\n/, content) do
        %{"app_name" => app_name} -> String.to_existing_atom(app_name)
        _ -> raise("Failed to read an app name from #{mix_file}")
      end
    else
      dir |> Path.dirname() |> find_app_name_in_dir()
    end
  end