Extracted breadcrumb logic to a view function

app/Controllers/DirectoryController.php

@@ -65,8 +65,7 @@ class DirectoryController
             'files' => $search ? $files->name(
                 sprintf('/(?:.*)%s(?:.*)/i', preg_quote($search, '/'))
             ) : $files->depth(0),
-            'title' => $this->relativePath($path),
-            'breadcrumbs' => $this->breadcrumbs($path),
+            'relative_path' => $this->relativePath($path),
             'is_root' => $this->isRoot($path),
             'readme' => $this->readme($path),
             'search' => $search,
@@ -87,28 +86,6 @@ class DirectoryController
         )->filter()->implode('/');
     }
 
-    /**
-     * Build an array of breadcrumbs for a given path.
-     *
-     * @param string $path
-     *
-     * @return array
-     */
-    protected function breadcrumbs(string $path): array
-    {
-        $breadcrumbs = Collection::make(explode('/', $path))->diff(
-            explode('/', $this->container->get('base_path'))
-        )->filter();
-
-        return $breadcrumbs->filter(function (string $crumb) {
-            return $crumb !== '.';
-        })->reduce(function (array $carry, string $crumb) {
-            $carry[$crumb] = end($carry) . "/{$crumb}";
-
-            return $carry;
-        }, []);
-    }
-
     /**
      * Determine if a provided path is the root path.
      *

app/Providers/TwigProvider.php

@@ -15,6 +15,7 @@ class TwigProvider
     /** @const Constant description */
     protected const VIEW_FUNCTIONS = [
         ViewFunctions\Asset::class,
+        ViewFunctions\Breadcrumbs::class,
         ViewFunctions\Config::class,
         ViewFunctions\Icon::class,
         ViewFunctions\Markdown::class,

app/ViewFunctions/Breadcrumbs.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\ViewFunctions;
+
+use Tightenco\Collect\Support\Collection;
+
+class Breadcrumbs extends ViewFunction
+{
+    /** @var string The function name */
+    protected $name = 'breadcrumbs';
+
+    /**
+     * Build an array of breadcrumbs for a given path.
+     *
+     * @param string $path
+     *
+     * @return array
+     */
+    public function __invoke(string $path)
+    {
+        $breadcrumbs = Collection::make(explode('/', $path))->diff(
+            explode('/', $this->container->get('base_path'))
+        )->filter();
+
+        return $breadcrumbs->filter(function (string $crumb) {
+            return $crumb !== '.';
+        })->reduce(function (array $carry, string $crumb) {
+            $carry[$crumb] = end($carry) . "/{$crumb}";
+
+            return $carry;
+        }, []);
+    }
+}

app/resources/views/components/header.twig

@@ -3,7 +3,7 @@
         <div class="text-white text-sm tracking-tight mb-2 md:my-2">
             <a href="/" class="hover:underline">Home</a>
 
-            {% for name, path in breadcrumbs %}
+            {% for name, path in breadcrumbs(relative_path) %}
                 / <a href="{{ path }}" class="hover:underline">{{ name }}</a>
             {% endfor %}
         </div>

app/resources/views/layouts/app.twig

@@ -7,7 +7,7 @@
 
 <link rel="stylesheet" href="{{ asset('app.css') }}">
 
-<title>{{ title | default('Home') }} &bull; Directory Lister</title>
+<title>{{ relative_path | default('Home') }} &bull; Directory Lister</title>
 
 <div id="app" class="flex flex-col min-h-screen font-mono {{ config('dark_mode') ? 'dark-mode' : 'light-mode' }}">
     {% block content %}{% endblock %}

tests/ViewFunctions/BreadcrumbsTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Tests\ViewFunctions;
+
+use App\ViewFunctions\Breadcrumbs;
+use Tests\TestCase;
+
+class BreadcrumbsTest extends TestCase
+{
+    public function test_it_can_parse_breadcrumbs_from_the_path(): void
+    {
+        $breadcrumbs = new Breadcrumbs($this->container, $this->config);
+
+        $this->assertEquals([
+            'foo' => '/foo',
+            'bar' => '/foo/bar',
+            'baz' => '/foo/bar/baz',
+        ], $breadcrumbs('foo/bar/baz'));
+    }
+
+    public function test_it_can_parse_breadcrumbs_for_dot_path(): void
+    {
+        $breadcrumbs = new Breadcrumbs($this->container, $this->config);
+
+        $this->assertEquals([], $breadcrumbs('.'));
+    }
+}