Allow referencing other snips in snip

src/Controller/SnipController.php

@@ -44,25 +44,25 @@ class SnipController extends AbstractController
     }
 
     #[Route('/single/{snip}', name: '_single')]
-    public function single(Snip $snip): Response
+    public function single(Snip $snip, Pipeline $pl): Response
     {
         $this->denyAccessUnlessGranted(SnipVoter::VIEW, $snip);
 
         $snipService = $this->snipServiceFactory->create($snip);
         return $this->render('snip/single.html.twig', [
             'snip' => $snip,
-            'content' => (new Pipeline())->parse($snipService->get()),
+            'content' => $pl->parse($snipService->get()),
             'branch' => $snipService->getRepo()->getCurrentBranchName(),
         ]);
     }
 
     #[Route('/raw/{snip}', name: '_raw')]
-    public function raw(Snip $snip, Request $request): Response
+    public function raw(Snip $snip, Pipeline $pl, Request $request): Response
     {
         $this->denyAccessUnlessGranted(SnipVoter::VIEW, $snip);
 
         $response = new Response(
-            (new Pipeline())->clean($this->snipServiceFactory->create($snip)->get()),
+            $pl->clean($this->snipServiceFactory->create($snip)->get()),
             Response::HTTP_OK,
             ['Content-Type' => 'text/html']
         );
@@ -77,10 +77,6 @@ class SnipController extends AbstractController
         }
 
         return $response;
-//        return $this->render('snip/single.html.twig', [
-//            'snip' => $snip,
-//            'content' => $this->snipServiceFactory->create($snip)->get(),
-//        ]);
     }
 
     #[Route('/edit/{snip}', name: '_edit')]

src/Service/SnipParser/Pipeline.php

@@ -3,19 +3,28 @@
 namespace App\Service\SnipParser;
 
 use App\Service\SnipParser\Stages\HtmlEscapeStage;
+use App\Service\SnipParser\Stages\UrlReferenceStage;
 use App\Service\SnipParser\Stages\ReplaceBlocksStage;
+use App\Service\SnipParser\Stages\ReplaceStage;
 use League\Pipeline\PipelineBuilder;
 
 class Pipeline
 {
+    public function __construct(
+        private readonly UrlReferenceStage $referenceStage,
+    ) {}
+
     public function parse(string $payload): string
     {
         $builder = new PipelineBuilder();
         $pipeline = $builder
             ->add(new HtmlEscapeStage())
+            ->add(new ReplaceStage(PHP_EOL, '<br>'))
             ->add(new ReplaceBlocksStage('<pre><code class="hljs">', '</code></pre>', '```'))
             ->add(new ReplaceBlocksStage('<code class="hljs">', '</code>', '``'))
-            ->build();
+            ->add($this->referenceStage)
+            ->build()
+        ;
 
         return $pipeline->process($payload);
     }

src/Service/SnipParser/Stages/HtmlEscapeStage.php

@@ -8,6 +8,7 @@ class HtmlEscapeStage implements StageInterface
 {
     public function __invoke(mixed $payload): string
     {
-        return htmlspecialchars($payload, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
+        // https://www.php.net/manual/en/function.htmlspecialchars.php
+        return htmlspecialchars($payload, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML5, 'UTF-8');
     }
 }

src/Service/SnipParser/Stages/ReplaceStage.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Service\SnipParser\Stages;
+
+use League\Pipeline\StageInterface;
+
+class ReplaceStage implements StageInterface
+{
+    // replaces a string with another string
+    public function __construct(
+        public readonly string $search,
+        public readonly string $replace,
+    ) {}
+
+    public function __invoke(mixed $payload): string
+    {
+        return str_replace($this->search, $this->replace, $payload);
+    }
+}

src/Service/SnipParser/Stages/UrlReferenceStage.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Service\SnipParser\Stages;
+
+use App\Repository\SnipRepository;
+use App\Security\Voter\SnipVoter;
+use League\Pipeline\StageInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+
+class UrlReferenceStage implements StageInterface
+{
+    public function __construct(
+        private readonly UrlGeneratorInterface $router,
+        private readonly Security              $security,
+        private readonly SnipRepository        $snipRepository,
+    ) {}
+
+    public function __invoke(mixed $payload): string
+    {
+        return $this->replaceReferences($payload);
+    }
+
+    private function replaceReferences(mixed $payload): string
+    {
+        // replaces all references (#n) to other snips with links
+        $pattern = '/#(\d+)/';
+
+        return preg_replace_callback($pattern, function ($matches) {
+            dump($matches);
+            $snip = $this->snipRepository->find($matches[1]);
+            if ($snip === null) {
+                return sprintf('<span title="not found">%s</span>', $matches[0]);
+            }
+            if (!$this->security->isGranted(SnipVoter::VIEW, $snip)) {
+                return sprintf('<span title="access denied">%s</span>', $matches[0]);
+            }
+
+            $url = $this->router->generate('snip_single', ['snip' => $snip->getId()]);
+            return sprintf('<a href="%s" title="Owner: %s">#%s</a>', $url, $snip->getCreatedBy(), $snip->getId());
+        }, $payload);
+    }
+}

templates/snip/single.html.twig

@@ -24,7 +24,7 @@
     <div class="card" style="width: 100%;">
         <h4 class="card-header">
             {{ include('snip/badge.html.twig', {snip: snip}) }}
-            {{ snip }}
+            {{ snip }} <small class="text-muted">#{{ snip.id }}</small>
         </h4>
         <div class="card-header">
             <p class="card-text">Current branch: {{ branch }}</p>