fix: add base tag to allow relative links to other chapters

Author: innocenzi

src/Web/BaseUriViewProcessor.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Web;
+
+use App\GitHub\GetStargazersCount;
+use Tempest\Router\Request;
+use Tempest\View\View;
+use Tempest\View\ViewProcessor;
+
+use function Tempest\Support\Str\strip_end;
+
+/**
+ * This processor is used to add a `<base>` tag without the trailing slash,
+ * allowing the documentation to use relative links to other chapters.
+ */
+final readonly class BaseUriViewProcessor implements ViewProcessor
+{
+    public function __construct(
+        private Request $request,
+    ) {
+    }
+
+    #[\Override]
+    public function process(View $view): View
+    {
+        return $view->data(baseUri: strip_end($this->request->uri, suffix: '/'));
+    }
+}

src/Web/x-base.view.php

@@ -6,6 +6,7 @@
 
     <meta charset="UTF-8"/>
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+    <base :href="$baseUri">
 
     <!-- Current meta image -->
     <?php