Move all files to docs/

docs/step4-adding-the-blog-repository/src/Controller/BlogPageController.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Drupal\my_module\Controller;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\my_module\Repository\ArticleRepository;
+
+class BlogPageController {
+
+  use StringTranslationTrait;
+
+  /**
+   * @var \Drupal\my_module\Repository\ArticleRepository
+   */
+  private $articleRepository;
+
+  /**
+   * @var \Drupal\Core\Entity\EntityViewBuilderInterface
+   */
+  private $nodeViewBuilder;
+
+  public function __construct(
+    EntityTypeManagerInterface $entityTypeManager,
+    ArticleRepository $articleRepository
+  ) {
+    $this->nodeViewBuilder = $entityTypeManager->getViewBuilder('node');
+    $this->articleRepository = $articleRepository;
+  }
+
+  public function __invoke(): array {
+    $build = [];
+
+    $articles = $this->articleRepository->getAll();
+
+    foreach ($articles as $article) {
+      $build[] = $this->nodeViewBuilder->view($article, 'teaser');
+    }
+
+    return [
+      '#markup' => render($build),
+    ];
+  }
+
+}

docs/step4-adding-the-blog-repository/src/Repository/ArticleRepository.php

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+<?php
+
+namespace Drupal\my_module\Repository;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\node\Entity\Node;
+use Drupal\node\NodeInterface;
+
+class ArticleRepository {
+
+  /**
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  private $nodeStorage;
+
+  public function __construct(EntityTypeManagerInterface $entityTypeManager) {
+    $this->nodeStorage = $entityTypeManager->getStorage('node');
+  }
+
+  public function getAll(): array {
+    $articles = $this->nodeStorage->loadByProperties([
+      'status' => Node::PUBLISHED,
+      'type' => 'article',
+    ]);
+
+    uasort($articles, function (NodeInterface $a, NodeInterface $b): bool {
+      return $a->getCreatedTime() < $b->getCreatedTime();
+    });
+
+    return $articles;
+  }
+
+}