Extract config descriptions for translation

lib/pleroma/docs/translator.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Docs.Translator do
+  require Pleroma.Web.Gettext
+
+  @before_compile Pleroma.Docs.Translator.Compiler
+end

lib/pleroma/docs/translator/compiler.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Docs.Translator.Compiler do
+  @external_resource "config/description.exs"
+  @raw_config Pleroma.Config.Loader.read("config/description.exs")
+  @raw_descriptions @raw_config[:pleroma][:config_description]
+
+  defmacro __before_compile__(_env) do
+    strings =
+      __MODULE__.descriptions()
+      |> __MODULE__.extract_strings()
+
+    quote do
+      def placeholder do
+        unquote do
+          Enum.map(
+            strings,
+            fn string ->
+              quote do
+                Pleroma.Web.Gettext.dgettext_noop("config_descriptions", unquote(string))
+              end
+            end
+          )
+        end
+      end
+    end
+  end
+
+  def descriptions do
+    Pleroma.Web.ActivityPub.MRF.config_descriptions()
+    |> Enum.reduce(@raw_descriptions, fn description, acc -> [description | acc] end)
+    |> Pleroma.Docs.Generator.convert_to_strings()
+  end
+
+  def extract_strings(descriptions) do
+    descriptions
+    |> Enum.reduce([], &process_item/2)
+  end
+
+  defp process_item(entity, acc) do
+    current_level =
+      acc
+      |> process_desc(entity)
+      |> process_label(entity)
+
+    process_children(entity, current_level)
+  end
+
+  defp process_desc(acc, %{description: desc}) do
+    [desc | acc]
+  end
+
+  defp process_desc(acc, _) do
+    acc
+  end
+
+  defp process_label(acc, %{label: label}) do
+    [label | acc]
+  end
+
+  defp process_label(acc, _) do
+    acc
+  end
+
+  defp process_children(%{children: children}, acc) do
+    children
+    |> Enum.reduce(acc, &process_item/2)
+  end
+
+  defp process_children(_, acc) do
+    acc
+  end
+end