Rename custom module directories

- Rename `opdavies_blog` to `blog`.
- Rename `opdavies_blog_test` to `blog_test`.
- Rename `opdavies_talks` to `talks`.
- Rename `opdavies_talks_test` to `talks_test`.

The files within the directories haven't changed, so there is no
breaking change caused by renaming the directories.

 Please enter the commit message for your changes. Lines starting

web/modules/custom/blog/src/Entity/Node/Post.php

@@ -0,0 +1,83 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\opdavies_blog\Entity\Node;
+
+use Drupal\discoverable_entity_bundle_classes\ContentEntityBundleInterface;
+use Drupal\node\Entity\Node;
+use Drupal\taxonomy\Entity\Term;
+use Illuminate\Support\Collection;
+
+/**
+ * Defines an blog post node class.
+ *
+ * @ContentEntityBundleClass(
+ *   label = @Translation("Blog post"),
+ *   entity_type = "node",
+ *   bundle = "post"
+ * );
+ */
+class Post extends Node implements ContentEntityBundleInterface {
+
+  public function getExternalLink(): ?array {
+    return ($link = $this->get('field_external_link')->get(0))
+      ? $link->getValue()
+      : NULL;
+  }
+
+  /**
+   * @return Collection|Term[]
+   */
+  public function getTags(): Collection {
+    return new Collection($this->get('field_tags')->referencedEntities());
+  }
+
+  public function hasBeenSentToSocialMedia(): bool {
+    return (bool) $this->get('field_sent_to_social_media')->getString();
+  }
+
+  public function hasTweet(): bool {
+    return (bool) $this->get('field_has_tweet')->getString();
+  }
+
+  public function isExternalPost(): bool {
+    return (bool) $this->getExternalLink();
+  }
+
+  public function setTags(array $tags): void {
+    $this->set('field_tags', $tags);
+  }
+
+  public function toTweet(): string {
+    $parts = [
+      $this->label(),
+      $this->url('canonical', ['absolute' => TRUE]),
+      $this->convertTermsToHashtags(),
+    ];
+
+    return implode(PHP_EOL . PHP_EOL, $parts);
+  }
+
+  private function convertTermsToHashtags(): string {
+    return $this->getTags()
+      ->filter(fn(Term $term) => !$this->tagsToRemove()
+        ->contains($term->label()))
+      ->map(fn(Term $term) => $this->convertTermToHashtag($term))
+      ->implode(' ');
+  }
+
+  private function tagsToRemove(): Collection {
+    // TODO: Move these values into configuration/settings.php.
+    return new Collection([
+      'Drupal Planet',
+    ]);
+  }
+
+  private function convertTermToHashtag(Term $tag): string {
+    return '#' . (new Collection(explode(' ', $tag->label())))
+        ->map(fn(string $word): string => ucfirst($word))
+        ->implode('');
+  }
+
+}