areas_without_callbacks.exs

"lib/**/*.ex"
|> Path.wildcard()
|> Enum.filter(&File.regular?/1)
|> Enum.filter(fn contract_path ->
  contract = File.read!(contract_path)
  legacy = String.contains?(contract, "Legacy")
  is_contract = String.contains?(contract, "@owner")
  has_callback = String.contains?(contract, "@callback")

  not legacy and is_contract and not has_callback
end)
|> Enum.map(&String.replace(&1, "lib/", ""))
|> Enum.map(&String.replace(&1, ".ex", ""))
|> Enum.map(&Path.dirname/1)
|> Enum.each(&IO.puts/1)