add twig extension for settings

core/Twig/Extension/SettingExtension.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Core\Twig\Extension;
+
+use App\Core\Setting\SettingManager;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
+
+class SettingExtension extends AbstractExtension
+{
+    private SettingManager $manager;
+
+    public function __construct(SettingManager $manager)
+    {
+        $this->manager = $manager;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions(): array
+    {
+        return [
+            new TwigFunction('setting', [$this, 'getSetting']),
+        ];
+    }
+
+    public function getSetting(string $code)
+    {
+        $entity = $this->manager->get($code);
+
+        return $entity ? $entity->getValue() : null;
+    }
+}