Issue #3185016 by hanoii, Chi: Translation filter

src/TwigTweakExtension.php

@@ -112,6 +112,7 @@ class TwigTweakExtension extends AbstractExtension {
       new TwigFilter('children', [self::class, 'childrenFilter']),
       new TwigFilter('file_uri', [self::class, 'fileUriFilter']),
       new TwigFilter('file_url', [self::class, 'fileUrlFilter']),
+      new TwigFilter('translation', [self::class, 'entityTranslation']),
     ];
 
     if (Settings::get('twig_tweak_enable_php_filter')) {
@@ -601,6 +602,22 @@ class TwigTweakExtension extends AbstractExtension {
     return \Drupal::service('twig_tweak.url_extractor')->extractUrl($input, $relative);
   }
 
+  /**
+   * Returns the translation for the given entity.
+   *
+   * @param \Drupal\Core\Entity\EntityInterface $entity
+   *   The entity to get the translation from.
+   * @param string $langcode
+   *   (optional) For which language the translation should be looked for,
+   *   defaults to the current language context.
+   *
+   * @return \Drupal\Core\Entity\EntityInterface
+   *   The appropriate translation for the given language context.
+   */
+  public static function entityTranslation(EntityInterface $entity, string $langcode = NULL): EntityInterface {
+    return \Drupal::service('entity.repository')->getTranslationFromContext($entity, $langcode);
+  }
+
   /**
    * Evaluates a string of PHP code.
    *

tests/src/Functional/TwigTweakTest.php

@@ -379,6 +379,11 @@ final class TwigTweakTest extends BrowserTestBase {
     $xpath = '//div[@class = "tt-file-url-from-media-field" and contains(text(), "/files/image-1.png")]';
     $this->assertXpath($xpath);
 
+    // -- Entity translation.
+    // This is just a smoke test because the node is not translatable.
+    $xpath = '//div[@class = "tt-translation" and contains(text(), "Alpha")]';
+    $this->assertXpath($xpath);
+
     // -- Hook twig_tweak_functions_alter().
     $xpath = '//div[@class = "tt-functions_alter" and text() = "-=bar=-"]';
     $this->assertXpath($xpath);

tests/twig_tweak_test/templates/twig-tweak-test.html.twig

@@ -97,6 +97,7 @@
   <div class="tt-file-url-from-image-field">{{ node.field_image|file_url }}</div>
   <div class="tt-file-url-from-image-field-delta">{{ node.field_image[0]|file_url }}</div>
   <div class="tt-file-url-from-media-field">{{ node.field_media|file_url }}</div>
+  <div class="tt-translation">{{ (node|translation).title.value }}</div>
   <div class="tt-functions_alter">{{ foo('bar') }}</div>
   <div class="tt-filters_alter">{{ 'foo'|bar }}</div>
   <div class="tt-tests_alter">{{ 'ok' is ok ? 'Yes' : 'No' }}</div>