[Translation] Introduce a way to configure the enabled locales

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php

@@ -677,6 +677,16 @@ class Configuration implements ConfigurationInterface
                         ->arrayNode('paths')
                             ->prototype('scalar')->end()
                         ->end()
+                        ->arrayNode('enabled_locales')
+                            ->prototype('scalar')
+                            ->defaultValue([])
+                            ->beforeNormalization()
+                                ->always()
+                                ->then(function ($config) {
+                                    return array_unique((array) $config);
+                                })
+                            ->end()
+                        ->end()
                     ->end()
                 ->end()
             ->end()

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -1039,6 +1039,8 @@ class FrameworkExtension extends Extension
         $defaultOptions['cache_dir'] = $config['cache_dir'];
         $translator->setArgument(4, $defaultOptions);
 
+        $translator->setArgument(6, $config['enabled_locales']);
+
         $container->setParameter('translator.logging', $config['logging']);
         $container->setParameter('translator.default_path', $config['default_path']);
 

src/Symfony/Bundle/FrameworkBundle/Resources/config/translation.xml

@@ -16,6 +16,7 @@
                 <argument key="cache_dir">%kernel.cache_dir%/translations</argument>
                 <argument key="debug">%kernel.debug%</argument>
             </argument>
+            <argument type="collection" /> <!-- enabled locales -->
             <call method="setConfigCacheFactory">
                 <argument type="service" id="config_cache_factory" />
             </call>

src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php

@@ -373,6 +373,7 @@ class ConfigurationTest extends TestCase
                 'formatter' => 'translator.formatter.default',
                 'paths' => [],
                 'default_path' => '%kernel.project_dir%/translations',
+                'enabled_locales' => [],
             ],
             'validation' => [
                 'enabled' => !class_exists(FullStack::class),

src/Symfony/Bundle/FrameworkBundle/Tests/Translation/TranslatorTest.php

@@ -109,7 +109,7 @@ class TranslatorTest extends TestCase
 
     public function testLoadResourcesWithoutCaching()
     {
-        $loader = new \Symfony\Component\Translation\Loader\YamlFileLoader();
+        $loader = new YamlFileLoader();
         $resourceFiles = [
             'fr' => [
                 __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
@@ -186,7 +186,7 @@ class TranslatorTest extends TestCase
 
     public function testCatalogResourcesAreAddedForScannedDirectories()
     {
-        $loader = new \Symfony\Component\Translation\Loader\YamlFileLoader();
+        $loader = new YamlFileLoader();
         $resourceFiles = [
             'fr' => [
                 __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
@@ -329,9 +329,9 @@ class TranslatorTest extends TestCase
         return $container;
     }
 
-    public function getTranslator($loader, $options = [], $loaderFomat = 'loader', $translatorClass = '\Symfony\Bundle\FrameworkBundle\Translation\Translator', $defaultLocale = 'en')
+    public function getTranslator($loader, $options = [], $loaderFomat = 'loader', $translatorClass = '\Symfony\Bundle\FrameworkBundle\Translation\Translator', $defaultLocale = 'en', array $enabledLocales = [])
     {
-        $translator = $this->createTranslator($loader, $options, $translatorClass, $loaderFomat, $defaultLocale);
+        $translator = $this->createTranslator($loader, $options, $translatorClass, $loaderFomat, $defaultLocale, $enabledLocales);
 
         if ('loader' === $loaderFomat) {
             $translator->addResource('loader', 'foo', 'fr');
@@ -348,7 +348,7 @@ class TranslatorTest extends TestCase
 
     public function testWarmup()
     {
-        $loader = new \Symfony\Component\Translation\Loader\YamlFileLoader();
+        $loader = new YamlFileLoader();
         $resourceFiles = [
             'fr' => [
                 __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
@@ -371,9 +371,34 @@ class TranslatorTest extends TestCase
         $this->assertEquals('répertoire', $translator->trans('folder'));
     }
 
+    public function testEnabledLocales()
+    {
+        $loader = new YamlFileLoader();
+        $resourceFiles = [
+            'fr' => [
+                __DIR__.'/../Fixtures/Resources/translations/messages.fr.yml',
+            ],
+        ];
+
+        // prime the cache without configuring the enabled locales
+        $translator = $this->getTranslator($loader, ['cache_dir' => $this->tmpDir, 'resource_files' => $resourceFiles], 'yml', Translator::class, 'en', []);
+        $translator->setFallbackLocales(['fr']);
+        $translator->warmup($this->tmpDir);
+
+        $this->assertCount(2, glob($this->tmpDir.'/catalogue.*.*.php'), 'Both "en" and "fr" catalogues are generated.');
+
+        // prime the cache and configure the enabled locales
+        $this->deleteTmpDir();
+        $translator = $this->getTranslator($loader, ['cache_dir' => $this->tmpDir, 'resource_files' => $resourceFiles], 'yml', Translator::class, 'en', ['fr']);
+        $translator->setFallbackLocales(['fr']);
+        $translator->warmup($this->tmpDir);
+
+        $this->assertCount(1, glob($this->tmpDir.'/catalogue.*.*.php'), 'Only the "fr" catalogue is generated.');
+    }
+
     public function testLoadingTranslationFilesWithDotsInMessageDomain()
     {
-        $loader = new \Symfony\Component\Translation\Loader\YamlFileLoader();
+        $loader = new YamlFileLoader();
         $resourceFiles = [
             'en' => [
                 __DIR__.'/../Fixtures/Resources/translations/domain.with.dots.en.yml',
@@ -386,14 +411,15 @@ class TranslatorTest extends TestCase
         $this->assertEquals('It works!', $translator->trans('message', [], 'domain.with.dots'));
     }
 
-    private function createTranslator($loader, $options, $translatorClass = '\Symfony\Bundle\FrameworkBundle\Translation\Translator', $loaderFomat = 'loader', $defaultLocale = 'en')
+    private function createTranslator($loader, $options, $translatorClass = '\Symfony\Bundle\FrameworkBundle\Translation\Translator', $loaderFomat = 'loader', $defaultLocale = 'en', array $enabledLocales = [])
     {
         if (null === $defaultLocale) {
             return new $translatorClass(
                 $this->getContainer($loader),
                 new MessageFormatter(),
                 [$loaderFomat => [$loaderFomat]],
-                $options
+                $options,
+                $enabledLocales
             );
         }
 
@@ -402,7 +428,8 @@ class TranslatorTest extends TestCase
             new MessageFormatter(),
             $defaultLocale,
             [$loaderFomat => [$loaderFomat]],
-            $options
+            $options,
+            $enabledLocales
         );
     }
 }

src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php

@@ -57,6 +57,11 @@ class Translator extends BaseTranslator implements WarmableInterface
      */
     private $scannedDirectories;
 
+    /**
+     * @var string[]
+     */
+    private $enabledLocales;
+
     /**
      * Constructor.
      *
@@ -69,10 +74,11 @@ class Translator extends BaseTranslator implements WarmableInterface
      *
      * @throws InvalidArgumentException
      */
-    public function __construct(ContainerInterface $container, MessageFormatterInterface $formatter, string $defaultLocale, array $loaderIds = [], array $options = [])
+    public function __construct(ContainerInterface $container, MessageFormatterInterface $formatter, string $defaultLocale, array $loaderIds = [], array $options = [], array $enabledLocales = [])
     {
         $this->container = $container;
         $this->loaderIds = $loaderIds;
+        $this->enabledLocales = $enabledLocales;
 
         // check option names
         if ($diff = array_diff(array_keys($options), array_keys($this->options))) {
@@ -97,8 +103,9 @@ class Translator extends BaseTranslator implements WarmableInterface
             return;
         }
 
-        $locales = array_merge($this->getFallbackLocales(), [$this->getLocale()], $this->resourceLocales);
+        $localesToWarmUp = $this->enabledLocales ?: array_merge($this->getFallbackLocales(), [$this->getLocale()], $this->resourceLocales);
-        foreach (array_unique($locales) as $locale) {
+
+        foreach (array_unique($localesToWarmUp) as $locale) {
             // reset catalogue in case it's already loaded during the dump of the other locales.
             if (isset($this->catalogues[$locale])) {
                 unset($this->catalogues[$locale]);