Add html indent bundle

bundle/HtmlPrettierBundle/DependencyInjection/HtmlPrettierExtension.php

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+<?php
+
+namespace Homepage\HtmlPrettierBundle\DependencyInjection;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+
+class HtmlPrettierExtension extends Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
+        $loader->load('services.yml');
+    }
+}

bundle/HtmlPrettierBundle/HtmlPrettier.php

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+<?php
+
+namespace Homepage\HtmlPrettierBundle;
+
+use Gajus\Dindent\Indenter;
+use Sculpin\Core\Event\SourceSetEvent;
+use Sculpin\Core\Sculpin;
+use Sculpin\Core\Source\SourceSet;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+class HtmlPrettier implements EventSubscriberInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            Sculpin::EVENT_AFTER_FORMAT => ['formatHtml', -100],
+        ];
+    }
+
+    public function formatHtml(SourceSetEvent $event): void
+    {
+        $indenter = new Indenter([
+            'indentation_character' => '  ',
+        ]);
+
+        $sources = $this->filterSource($event->sourceSet());
+
+        /** @var \Sculpin\Core\Source\SourceInterface $source */
+        foreach ($sources as $source) {
+            $html = $source->formattedContent();
+            $formatted = $indenter->indent($html);
+            $source->setFormattedContent($formatted);
+        }
+    }
+
+    private function filterSource(SourceSet $sourceSet): \Generator
+    {
+        /** @var \Sculpin\Core\Source\SourceInterface $source */
+        foreach ($sourceSet->allSources() as $source) {
+            $filename = $source->filename();
+            if ($this->endsWith($filename, '.md') || $this->endsWith($filename, '.html.twig')) {
+                yield $source;
+            }
+        }
+    }
+
+    private function endsWith($haystack, $needle): bool
+    {
+        $length = \strlen($needle);
+
+        return $length === 0 || (substr($haystack, -$length) === $needle);
+    }
+}

bundle/HtmlPrettierBundle/HtmlPrettierBundle.php

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+<?php
+
+namespace Homepage\HtmlPrettierBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class HtmlPrettierBundle extends Bundle
+{
+    public const class_name = __CLASS__;
+}

bundle/HtmlPrettierBundle/Resources/config/services.yml

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+services:
+
+  homepage.html_prettier:
+    class: \Homepage\HtmlPrettierBundle\HtmlPrettier
+    tags:
+      - { name: kernel.event_subscriber }