Add TalkExtension as a Twig extension

app/config/sculpin_kernel.yml

@@ -6,3 +6,8 @@ sculpin_content_types:
         taxonomies: [tags]
     talks:
         permalink: talks/:basename/
+
+services:
+    App\TwigExtension\TalkExtension:
+        tags:
+            - { name: twig.extension }

src/TwigExtension/TalkExtension.php

@@ -5,10 +5,19 @@ declare(strict_types=1);
 namespace App\TwigExtension;
 
 use Illuminate\Support\Collection;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFunction;
 
-final class TalkExtension
+final class TalkExtension extends AbstractExtension
 {
-    public function getPastTalksCount(array $talks = []): int
+    public function getFunctions()
+    {
+        return [
+            new TwigFunction('get_past_talk_count', [$this, 'getPastTalkCount']),
+        ];
+    }
+
+    public function getPastTalkCount(array $talks = []): int
     {
         $talkCollection = new Collection($talks);
 

tests/TalkExtensionTest.php

@@ -10,6 +10,6 @@ final class TalkExtensionTest extends TestCase
     /** @test */
     public function it_returns_zero_if_there_are_no_talks(): void
     {
-        $this->assertSame(0, (new TalkExtension())->getPastTalksCount([]));
+        $this->assertSame(0, (new TalkExtension())->getPastTalkCount([]));
     }
 }