Add Mermaid diagrams converter

app/SculpinKernel.php

@@ -1,6 +1,7 @@
 <?php
 
 use App\Bundles\AtomFeedGeneratorBundle\SculpinAtomFeedGeneratorBundle;
+use App\Bundles\MermaidBundle\SculpinMermaidBundle;
 use App\Bundles\SharingImageGeneratorBundle\SculpinSharingImageGeneratorBundle;
 use Sculpin\Bundle\SculpinBundle\HttpKernel\AbstractKernel;
 
@@ -10,7 +11,8 @@ protected function getAdditionalSculpinBundles(): array
     {
         return [
             SculpinAtomFeedGeneratorBundle::class,
-            SculpinSharingImageGeneratorBundle::class
+            SculpinSharingImageGeneratorBundle::class,
+            SculpinMermaidBundle::class,
         ];
     }
-}
+}

app/src/Bundles/MermaidBundle/DependencyInjection/Configuration.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Bundles\MermaidBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+class Configuration implements ConfigurationInterface
+{
+    public function getConfigTreeBuilder(): TreeBuilder
+    {
+        return new TreeBuilder('sculpin_mermaid_converter');
+    }
+}

app/src/Bundles/MermaidBundle/DependencyInjection/SculpinMermaidExtension.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Bundles\MermaidBundle\DependencyInjection;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+
+class SculpinMermaidExtension extends Extension
+{
+    public function load(array $configs, ContainerBuilder $container): void
+    {
+        $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
+        $loader->load('services.xml');
+    }
+}

app/src/Bundles/MermaidBundle/MermaidConverter.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace App\Bundles\MermaidBundle;
+
+use Dflydev\DotAccessConfiguration\Configuration;
+use Sculpin\Core\Event\ConvertEvent;
+use Sculpin\Core\Sculpin;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Finder\Finder;
+use Symfony\Component\Process\Process;
+
+class MermaidConverter implements EventSubscriberInterface
+{
+    private Configuration $configuration;
+
+    public function __construct(Configuration $configuration)
+    {
+        $this->configuration = $configuration;
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            Sculpin::EVENT_BEFORE_CONVERT => 'beforeConvert',
+        ];
+    }
+
+    public function beforeConvert(ConvertEvent $event): void
+    {
+        $env = $this->configuration->get('env') ?? 'dev';
+
+        $source = $event->source();
+        $original_file = file_get_contents($source->file()->getRealPath());
+        $original_content = $source->content();
+        if (is_null($original_content) || !str_contains($original_content, '```mermaid')) {
+            return;
+        }
+
+        $year = date('Y', $source->data()->get('date'));
+        $slug = basename($source->data()->get('url'));
+        $filesystem = new Filesystem();
+        $assets_path = "/assets/post-images/{$year}/{$slug}/";
+        $image_path = "output_$env{$assets_path}";
+        if (!$filesystem->exists($image_path)) {
+            $filesystem->mkdir($image_path);
+        }
+
+        $process = new Process([
+            'npx', '-p', '@mermaid-js/mermaid-cli', 
+            'mmdc', '-i', $source->file()->getRealPath(),
+//            '-o', $source->file()->getRealPath(),
+        ]);
+        echo "\n";
+        $process->run(function($type, $buffer) { echo($buffer); });
+
+        $finder = new Finder();
+        $finder->files()->in(dirname($source->file()->getRealPath()))->name('*.svg');
+
+        $mermaid_block_regex = '/```mermaid([^\S\n]*\r?\n([\s\S]*?))```/';
+
+        $diagrams = [];
+        foreach ($finder as $file) {
+            $filesystem->copy($file->getRealPath(), $image_path . $file->getFilename());
+            $diagrams[] = $assets_path . $file->getFilename();
+            $filesystem->remove($file->getRealPath());
+        }
+
+        $new_content = $original_content;
+        $i = 0;
+        $new_content = preg_replace_callback(
+            $mermaid_block_regex,
+            function ($matches) use ($diagrams, &$i) {
+                return sprintf("![Diagram %d](%s)", $i, $diagrams[$i++]);
+            },
+            $new_content
+        );
+
+        $source->setContent($new_content);
+    }
+}

app/src/Bundles/MermaidBundle/Resources/config/services.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" ?>
+<container xmlns="http://symfony.com/schema/dic/services"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+
+  <services>
+    <service id="sculpin_mermaid.converter"
+             class="App\Bundles\MermaidBundle\MermaidConverter">
+      <argument type="service" id="sculpin.site_configuration"/>
+
+      <tag name="kernel.event_subscriber"/>
+    </service>
+  </services>
+
+</container>

app/src/Bundles/MermaidBundle/SculpinMermaidBundle.php

@@ -0,0 +1,9 @@
+<?php
+
+namespace App\Bundles\MermaidBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class SculpinMermaidBundle extends Bundle
+{
+}

composer.json

@@ -14,7 +14,8 @@
     "php": "^8.3",
     "ext-gd": "*",
     "ext-dom": "*",
-    "sculpin/sculpin": "3.3.0-alpha"
+    "sculpin/sculpin": "3.3.0-alpha",
+    "symfony/process": "^6.4|^7.0"
   },
   "require-dev": {
     "roave/security-advisories": "dev-latest"