feat: frontend content flexible order priorities

framework/core/src/Admin/AdminServiceProvider.php

@@ -109,7 +109,7 @@ public function register(): void
             /** @var \Flarum\Frontend\Frontend $frontend */
             $frontend = $container->make('flarum.frontend.factory')('admin');
 
-            $frontend->content($container->make(Content\AdminPayload::class));
+            $frontend->content($container->make(Content\AdminPayload::class), 100);
 
             return $frontend;
         });

framework/core/src/Extend/Frontend.php

@@ -132,12 +132,13 @@ public function removeRoute(string $name): self
      * - \Psr\Http\Message\ServerRequestInterface $request
      *
      * The callable should return void.
+     * @param int $priority: The priority of the content. Higher priorities are executed first.
      *
      * @return self
      */
-    public function content(callable|string|null $callback): self
+    public function content(callable|string|null $callback, int $priority = 0): self
     {
-        $this->content[] = $callback;
+        $this->content[] = compact('callback', 'priority');
 
         return $this;
     }
@@ -303,7 +304,7 @@ private function registerContent(Container $container): void
             "flarum.frontend.$this->frontend",
             function (ActualFrontend $frontend, Container $container) {
                 foreach ($this->content as $content) {
-                    $frontend->content(ContainerUtil::wrapCallback($content, $container));
+                    $frontend->content(ContainerUtil::wrapCallback($content['callback'], $container), $content['priority']);
                 }
             }
         );
@@ -323,7 +324,7 @@ function (ActualFrontend $frontend, Container $container) {
                         $preloads = is_callable($preloadArr) ? ContainerUtil::wrapCallback($preloadArr, $container)($document) : $preloadArr;
                         $document->preloads = array_merge($document->preloads, $preloads);
                     }
-                });
+                }, 110);
             }
         );
     }

framework/core/src/Forum/ForumServiceProvider.php

@@ -22,6 +22,7 @@
 use Flarum\Frontend\AddTranslations;
 use Flarum\Frontend\Assets;
 use Flarum\Frontend\Compiler\Source\SourceCollector;
+use Flarum\Frontend\Frontend;
 use Flarum\Frontend\RecompileFrontendAssets;
 use Flarum\Http\Middleware as HttpMiddleware;
 use Flarum\Http\RouteCollection;
@@ -127,8 +128,15 @@ public function register(): void
             return $assets;
         });
 
-        $this->container->bind('flarum.frontend.forum', function (Container $container) {
-            return $container->make('flarum.frontend.factory')('forum');
+        $this->container->bind('flarum.frontend.forum', function (Container $container, array $parameters = []) {
+            /** @var Frontend $frontend */
+            $frontend = $container->make('flarum.frontend.factory')('forum');
+
+            if (isset($parameters['content'])) {
+                $frontend->content(is_callable($parameters['content']) ? $parameters['content'] : $container->make($parameters['content']), 100);
+            }
+
+            return $frontend;
         });
 
         $this->container->singleton('flarum.forum.discussions.sortmap', function () {

framework/core/src/Frontend/Frontend.php

@@ -17,7 +17,7 @@
 class Frontend
 {
     /**
-     * @var callable[]
+     * @var array<array{callback: callable, priority: int}>
      */
     protected array $content = [];
 
@@ -27,9 +27,9 @@ public function __construct(
     ) {
     }
 
-    public function content(callable $content): void
+    public function content(callable $callback, int $priority): void
     {
-        $this->content[] = $content;
+        $this->content[] = compact('callback', 'priority');
     }
 
     public function document(Request $request): Document
@@ -45,8 +45,14 @@ public function document(Request $request): Document
 
     protected function populate(Document $document, Request $request): void
     {
-        foreach ($this->content as $content) {
-            $content($document, $request);
+        $content = $this->content;
+
+        usort($content, function ($a, $b) {
+            return $b['priority'] <=> $a['priority'];
+        });
+
+        foreach ($content as $item) {
+            $item['callback']($document, $request);
         }
     }
 

framework/core/src/Frontend/FrontendServiceProvider.php

@@ -54,15 +54,16 @@ public function register(): void
 
         $this->container->singleton('flarum.frontend.factory', function (Container $container) {
             return function (string $name) use ($container) {
+                /** @var Frontend $frontend */
                 $frontend = $container->make(Frontend::class);
 
                 $frontend->content(function (Document $document) use ($name) {
                     $document->layoutView = 'flarum::frontend.'.$name;
-                });
+                }, 200);
 
-                $frontend->content($container->make(Content\Assets::class)->forFrontend($name));
-                $frontend->content($container->make(Content\CorePayload::class));
-                $frontend->content($container->make(Content\Meta::class));
+                $frontend->content($container->make(Content\Assets::class)->forFrontend($name), 190);
+                $frontend->content($container->make(Content\CorePayload::class), 180);
+                $frontend->content($container->make(Content\Meta::class), 170);
 
                 $frontend->content(function (Document $document) use ($container) {
                     $default_preloads = $container->make('flarum.frontend.default_preloads');
@@ -90,7 +91,7 @@ public function register(): void
                         $default_preloads,
                         $document->preloads,
                     );
-                });
+                }, 160);
 
                 return $frontend;
             };

framework/core/src/Http/RouteHandlerFactory.php

@@ -40,11 +40,7 @@ public function toController(callable|string $controller): Closure
     public function toFrontend(string $frontend, callable|string|null $content = null): Closure
     {
         return $this->toController(function (Container $container) use ($frontend, $content) {
-            $frontend = $container->make("flarum.frontend.$frontend");
-
-            if ($content) {
-                $frontend->content(is_callable($content) ? $content : $container->make($content));
-            }
+            $frontend = $container->make("flarum.frontend.$frontend", compact('content'));
 
             return new FrontendController($frontend);
         });

framework/core/tests/integration/extenders/FrontendContentTest.php

@@ -0,0 +1,89 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration\extenders;
+
+use Flarum\Extend\Frontend;
+use Flarum\Frontend\Document;
+use Flarum\Testing\integration\RetrievesAuthorizedUsers;
+use Flarum\Testing\integration\TestCase;
+
+class FrontendContentTest extends TestCase
+{
+    use RetrievesAuthorizedUsers;
+
+    /**
+     * @test
+     */
+    public function content_added_with_low_priority_by_default()
+    {
+        $title = null;
+
+        $this->extend(
+            (new Frontend('forum'))
+                ->content(function (Document $document) use (&$title) {
+                    $title = $document->title;
+                }),
+        );
+
+        $body = $this->send(
+            $this->request('GET', '/')
+        )->getBody()->getContents();
+
+        $this->assertNotNull($title, $body);
+    }
+
+    /**
+     * @test
+     */
+    public function content_can_be_added_with_high_priority()
+    {
+        $title = 1;
+
+        $this->extend(
+            (new Frontend('forum'))
+                ->content(function (Document $document) use (&$title) {
+                    $title = $document->title;
+                }, 110),
+        );
+
+        $body = $this->send(
+            $this->request('GET', '/')
+        )->getBody()->getContents();
+
+        $this->assertNull($title, $body);
+    }
+
+    /**
+     * @test
+     */
+    public function contents_can_be_added_with_different_priorities()
+    {
+        $test = [];
+
+        $this->extend(
+            (new Frontend('forum'))
+                ->content(function (Document $document) use (&$test) {
+                    $test[] = 1;
+                }, 110)
+                ->content(function (Document $document) use (&$test) {
+                    $test[] = 3;
+                }, 90)
+                ->content(function (Document $document) use (&$test) {
+                    $test[] = 2;
+                }, 100),
+        );
+
+        $body = $this->send(
+            $this->request('GET', '/')
+        )->getBody()->getContents();
+
+        $this->assertEquals([1, 2, 3], $test, $body);
+    }
+}