Minimal worked solution

config/config.exs

@@ -6,6 +6,10 @@ config :logger, :console,
   metadata: [:request_id]
 
 config :translator,
+  input_folder: "input",
+  output_folder: "output",
+  base_folder: "priv",
+  translators: [Translator.Yandex],
   parsers: [Translator.Parser.YAML, Translator.Parser.JSON],
   availiable_languages: ~w(en zh ar es hi de ru be uk kk bn pl pt it fr)
 

lib/translator/batcher.ex

@@ -1,28 +1,79 @@
 defmodule Translator.Batcher do
-  alias Translator.Languages
+  alias Translator.{Languages, Parser}
+
+  def process(batch) do
+    #  ,:ok <- translate_and_save(loaded)
+    with {:ok, formed} <- parse(batch),
+         {:ok, loaded} <- load(formed),
+         :ok <- translate_and_save(loaded) do
+      loaded
+    end
+  end
+
+  defp base_folder(), do: Application.get_env(:translator, :base_folder, "priv")
+  defp output_folder(), do: Application.get_env(:translator, :output_folder, "output")
+  defp input_folder(), do: Application.get_env(:translator, :input_folder, "input")
+
+  defp input_path(), do: Path.join(base_folder(), input_folder())
+  defp output_path(), do: Path.join(base_folder(), output_folder())
+
+  defp load(batch) do
+    loaded =
+      batch.files
+      |> Enum.reduce([], fn filename, acc ->
+        path = Path.join(batch.from, filename)
+        {:ok, content} = Parser.load(path)
+
+        [{filename, content} | acc]
+      end)
+      |> Map.new()
+
+    {:ok, Map.put(batch, :loaded, loaded)}
+  end
 
   @spec parse(String.t()) :: {:ok, map} | {:error, String.t()}
-  def parse(path) do
-    batch = Path.basename(path)
-
-    folder =
-      Path.join(path, Languages.pattern())
+  defp parse(batch) do
+    from =
+      Path.join([input_path(), batch, Languages.pattern()])
       |> Path.wildcard()
       |> List.first()
 
-    case folder do
+    case from do
       nil ->
-        {:error, "Couldn't find input folder in batch '#{path}'"}
+        {:error, "Couldn't find input folder in batch at '#{from}'"}
 
       _ ->
+        files =
+          Path.wildcard(Path.join(from, "**"))
+          |> Enum.map(fn path -> Path.relative_to(path, from) end)
+
         {:ok,
          %{
-           name: batch,
-           folder: path,
-           input: folder,
-           language: Path.basename(folder),
-           files: Path.wildcard(Path.join(folder, "**"))
+           batch: batch,
+           from: from,
+           language: Path.basename(from),
+           files: files
          }}
     end
   end
+
+  defp translate_and_save(batch) do
+    target_languages = Languages.list() -- List.wrap(batch.language)
+
+    target_languages
+    |> Enum.each(fn language ->
+      language_path = Path.join([output_path, batch.batch, language])
+
+      File.mkdir_p(language_path)
+
+      batch.loaded
+      |> Enum.each(fn {filename, data} ->
+        {:ok, translation} = Translator.translate(data, language, batch.language)
+        file_path = Path.join(language_path, filename)
+        Parser.save(file_path, translation)
+      end)
+    end)
+
+    :ok
+  end
 end

lib/translator/parser.ex

@@ -55,9 +55,7 @@ defmodule Translator.Parser do
 
   @spec availiable() :: availiable_parsers_map
   defp availiable() do
-    parsers = Application.get_env(:translator, :parsers)
-
-    parsers
+    Application.get_env(:translator, :parsers)
     |> Enum.reduce(%{}, fn parser, avaliable_extensions_map ->
       {:ok, extensions} = parser.extensions()
 

lib/translator/parser/json.ex

@@ -7,19 +7,19 @@ defmodule Translator.Parser.JSON do
 
   @behaviour Translator.Parser.Base
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec parse(contents) :: {:ok, data} | {:error, atom | Jason.DecodeError.t()}
   def parse(contents) do
     Jason.decode(contents)
   end
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec generate(data) :: {:ok, contents} | {:error, any}
   def generate(data) do
     Jason.encode(data)
   end
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec extensions() :: {:ok, extensions}
   def extensions(), do: {:ok, @extensions}
 end

lib/translator/parser/yaml.ex

@@ -7,13 +7,13 @@ defmodule Translator.Parser.YAML do
 
   @behaviour Translator.Parser.Base
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec parse(contents) :: {:ok, data} | {:error, atom | Jason.DecodeError.t()}
   def parse(contents) do
     YamlElixir.read_from_string(contents)
   end
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec generate(data) :: {:ok, contents} | {:error, any}
   def generate(data) do
     {:ok, to_yaml(data)}
@@ -35,7 +35,7 @@ defmodule Translator.Parser.YAML do
   defp value_to_yaml(value, key, indentation) when is_map(value),
     do: "#{indentation}#{key}:\n#{to_yaml(value, "#{indentation}  ")}"
 
-  @impl Translator.Parser.Base
+  @impl true
   @spec extensions() :: {:ok, extensions}
   def extensions(), do: {:ok, @extensions}
 end

lib/translator/translator.ex

@@ -1,4 +1,61 @@
 defmodule Translator do
-  defdelegate translate(text, to, from), to: YandexTranslate
-  defdelegate translate(text, to), to: YandexTranslate
+  @type text :: String.t()
+  @type locale :: String.t()
+  @type from :: locale
+  @type to :: locale
+  @type message :: String.t()
+  @type translator :: atom
+
+  @spec availiable :: [atom]
+  def availiable(), do: Application.get_env(:translator, :translators)
+
+  @spec default :: atom
+  def default(), do: availiable() |> List.first()
+
+  def translate(data, to, from, translator \\ default())
+
+  @spec translate(nil, to, from, translator) :: {:ok, nil} | {:error, message}
+  def translate(value, _to, _from, _translator)
+      when is_nil(value) or is_number(value) or is_boolean(value) or is_atom(value),
+      do: {:ok, value}
+
+  @spec translate(text, to, from, translator) :: {:ok, text} | {:error, message}
+  def translate(text, to, from, translator) when is_bitstring(text),
+    do: translator.translate(text, to, from)
+
+  @spec translate(map, to, from, translator) :: {:ok, map} | {:error, message}
+  def translate(map, to, from, translator) when is_map(map) do
+    {:ok, translate_map!(map, to, from, translator)}
+  end
+
+  @spec translate([map | text], to, from, translator) :: {:ok, [map | text]} | {:error, message}
+  def translate(list, to, from, translator) when is_list(list) do
+    {:ok, translate_list!(list, to, from, translator)}
+  end
+
+  @spec translate_list!(list, to, from, translator) :: [map | text] | {:error, message}
+  defp translate_list!(list, to, from, translator) when is_list(list) do
+    list
+    |> Enum.map(fn source ->
+      case translate(source, to, from, translator) do
+        {:ok, translation} -> translation
+        {:error, _message} -> source
+      end
+    end)
+  end
+
+  @spec translate_map!(map, to, from, translator) :: map | {:error, message}
+  defp translate_map!(data, to, from, translator) when is_map(data) do
+    data
+    |> Map.keys()
+    |> Enum.map(fn key ->
+      source = Map.fetch!(data, key)
+
+      case translate(source, to, from, translator) do
+        {:ok, translation} -> {key, translation}
+        {:error, _message} -> {key, source}
+      end
+    end)
+    |> Map.new()
+  end
 end

lib/translator/translator/base.ex

@@ -0,0 +1,22 @@
+defmodule Translator.Base do
+  @typedoc """
+  Plain Text
+  """
+  @type text :: String.t()
+
+  @typedoc """
+  Locale
+  """
+  @type locale :: String.t()
+  @type from :: locale
+  @type to :: locale
+
+  @typedoc """
+  Error Message
+  """
+  @type message :: String.t()
+
+  @callback detect(text) :: {:ok, locale} | {:error, message}
+  @callback translate(text, to) :: {:ok, text} | {:error, message}
+  @callback translate(text, to, from) :: {:ok, text} | {:error, message}
+end

lib/translator/translator/yandex.ex

@@ -0,0 +1,57 @@
+defmodule Translator.Yandex do
+  @type text :: String.t()
+  @type locale :: String.t()
+  @type from :: locale
+  @type to :: locale
+  @type message :: String.t()
+
+  @behaviour Translator.Base
+
+  @impl true
+  @spec detect(text) :: {:ok, locale} | {:error, message}
+  def detect(text) do
+    case YandexTranslate.detect(text) do
+      %{languageCode: locale} -> {:ok, locale}
+      %{message: message} -> {:error, message}
+    end
+  end
+
+  @impl true
+  @spec translate(text, to) :: {:ok, text} | {:error, message}
+  def translate(text, to) do
+    case detect(text) do
+      {:ok, from} -> translate(text, to, from)
+      {:error, message} -> {:error, message}
+    end
+  end
+
+  @impl true
+  @spec translate(text, to, from) :: {:ok, text} | {:error, message}
+  def translate(text, to, from) do
+    case YandexTranslate.translate(text, to, from) do
+      %{translations: translations} ->
+        translations
+        |> List.first()
+        |> Map.fetch(:text)
+        |> normalize()
+
+      %{message: message} ->
+        {:error, message}
+    end
+  end
+
+  @spec normalize({:ok, text}) :: {:ok, text} | {:error, message}
+  defp normalize({:ok, text}), do: normalize(text)
+
+  @spec normalize(text) :: {:ok, text} | {:error, message}
+  defp normalize(text) do
+    result =
+      text
+      |> String.replace(~r/(<)(\s)?(\/)?(\s)?(\w+)(\s)?(\/)?(\s)?(>)/, "\\1\\3\\5\\7\\9")
+      |> String.replace(~r/<(\w|\/)+>/, fn tag -> String.downcase(tag) end)
+      |> String.replace("> <", "><")
+      |> String.replace("% {", "%{")
+
+    {:ok, result}
+  end
+end