Extract gettext translations inside macro

[Eiji]

Glad to hear that not only me is looking for this.

This is about said data argument in some_dsl macro, see:

@Eiji

defmodule MyApp.Example do
  use MyLib.DSL, gettext_backend: MyApp.GettextBackend

  some_dsl "text to translate"

  # vs generated

  for data <- ~w[first second third] do
    some_dsl data
  end
end