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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Maps do
   6   def put_if_present(map, key, value, value_function \\ &{:ok, &1}) when is_map(map) do
   7     with false <- is_nil(key),
   8          false <- is_nil(value),
   9          {:ok, new_value} <- value_function.(value) do
  10       Map.put(map, key, new_value)
  11     else
  12       _ -> map
  13     end
  14   end
  15 end