detect(nil) return error

README.md

@@ -10,7 +10,7 @@ by adding `localizator` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:localizator, "~> 0.1.15"}
+    {:localizator, "~> 0.1.16"}
   ]
 end
 ```

lib/translator/microsoft.ex

@@ -8,6 +8,10 @@ defmodule Localizator.Translator.Microsoft do
 
   @behaviour Localizator.Translator.Base
 
+  @impl true
+  @spec detect(nil) :: {:error, message}
+  def detect(nil), do: {:error, "Couldn't detect language"}
+
   @impl true
   @spec detect(text) :: {:ok, locale} | {:error, message}
   def detect(text) when is_bitstring(text) do
@@ -21,11 +25,7 @@ defmodule Localizator.Translator.Microsoft do
   @spec detect(map) :: {:ok, locale} | {:error, message}
   def detect(map) when is_map(map) do
     {:ok, sample} = Map.fetch(map, List.first(Map.keys(map)))
-
-    case MicrosoftTranslator.detect(sample) do
-      %{languageCode: locale} -> {:ok, locale}
-      %{} -> {:error, "Couldn't detect language"}
-    end
+    detect(sample)
   end
 
   @impl true

lib/translator/yandex.ex

@@ -8,6 +8,10 @@ defmodule Localizator.Translator.Yandex do
 
   @behaviour Localizator.Translator.Base
 
+  @impl true
+  @spec detect(nil) :: {:error, message}
+  def detect(nil), do: {:error, "Couldn't detect language"}
+
   @impl true
   @spec detect(text) :: {:ok, locale} | {:error, message}
   def detect(text) when is_bitstring(text) do
@@ -21,11 +25,7 @@ defmodule Localizator.Translator.Yandex do
   @spec detect(map) :: {:ok, locale} | {:error, message}
   def detect(map) when is_map(map) do
     {:ok, sample} = Map.fetch(map, List.first(Map.keys(map)))
-
-    case YandexTranslate.detect(sample) do
-      %{languageCode: locale} -> {:ok, locale}
-      %{} -> {:error, "Couldn't detect language"}
-    end
+    detect(sample)
   end
 
   @impl true

mix.exs

@@ -4,7 +4,7 @@ defmodule Localizator.MixProject do
   def project do
     [
       app: :localizator,
-      version: "0.1.15",
+      version: "0.1.16",
       elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()