Refactor to avoid calling Mobilizon.Cldr.known_locale_name with a string

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/resolvers/admin.ex

@@ -176,8 +176,7 @@ defmodule Mobilizon.GraphQL.Resolvers.Admin do
 
   @spec get_list_of_languages(any(), any(), any()) :: {:ok, String.t()} | {:error, any()}
   def get_list_of_languages(_parent, %{codes: codes}, _resolution) when is_list(codes) do
-    locale = Gettext.get_locale()
-    locale = if Cldr.known_locale_name?(locale), do: locale, else: "en"
+    locale = Mobilizon.Cldr.locale_or_default(Gettext.get_locale())
 
     case Language.known_languages(locale) do
       data when is_map(data) ->

lib/mobilizon/cldr.ex

@@ -12,4 +12,18 @@ defmodule Mobilizon.Cldr do
         else: nil
       ),
     providers: [Cldr.Number, Cldr.Calendar, Cldr.DateTime, Cldr.Language]
+
+  def known_locale?(locale) do
+    Mobilizon.Cldr.known_locale_names()
+    |> Enum.map(&Atom.to_string/1)
+    |> Enum.member?(locale)
+  end
+
+  def locale_or_default(locale, default \\ "en") do
+    if known_locale?(locale) do
+      locale
+    else
+      default
+    end
+  end
 end

lib/service/date_time/date_time.ex

@@ -8,17 +8,26 @@ defmodule Mobilizon.Service.DateTime do
 
   @spec datetime_to_string(DateTime.t(), String.t(), to_string_format()) :: String.t()
   def datetime_to_string(%DateTime{} = datetime, locale \\ "en", format \\ :medium) do
-    Mobilizon.Cldr.DateTime.to_string!(datetime, format: format, locale: locale_or_default(locale))
+    Mobilizon.Cldr.DateTime.to_string!(datetime,
+      format: format,
+      locale: Mobilizon.Cldr.locale_or_default(locale)
+    )
   end
 
   @spec datetime_to_time_string(DateTime.t(), String.t(), to_string_format()) :: String.t()
   def datetime_to_time_string(%DateTime{} = datetime, locale \\ "en", format \\ :short) do
-    Mobilizon.Cldr.Time.to_string!(datetime, format: format, locale: locale_or_default(locale))
+    Mobilizon.Cldr.Time.to_string!(datetime,
+      format: format,
+      locale: Mobilizon.Cldr.locale_or_default(locale)
+    )
   end
 
   @spec datetime_to_date_string(DateTime.t(), String.t(), to_string_format()) :: String.t()
   def datetime_to_date_string(%DateTime{} = datetime, locale \\ "en", format \\ :short) do
-    Mobilizon.Cldr.Date.to_string!(datetime, format: format, locale: locale_or_default(locale))
+    Mobilizon.Cldr.Date.to_string!(datetime,
+      format: format,
+      locale: Mobilizon.Cldr.locale_or_default(locale)
+    )
   end
 
   @spec datetime_tz_convert(DateTime.t(), String.t() | nil) :: DateTime.t()
@@ -38,18 +47,10 @@ defmodule Mobilizon.Service.DateTime do
   def datetime_relative(%DateTime{} = datetime, locale \\ "en") do
     Relative.to_string!(datetime, Mobilizon.Cldr,
       relative_to: DateTime.utc_now(),
-      locale: locale_or_default(locale)
+      locale: Mobilizon.Cldr.locale_or_default(locale)
     )
   end
 
-  defp locale_or_default(locale) do
-    if Mobilizon.Cldr.known_locale_name(locale) do
-      locale
-    else
-      "en"
-    end
-  end
-
   @spec is_first_day_of_week(Date.t(), String.t()) :: boolean()
   defp is_first_day_of_week(%Date{} = date, locale) do
     Date.day_of_week(date) == Cldr.Calendar.first_day_for_locale(locale)