Theme: Updated view registration to be dynamic

Within the responsibility of the theme service instead
of being part of the app configuration.

app/App/Providers/ThemeServiceProvider.php

@@ -24,6 +24,7 @@ class ThemeServiceProvider extends ServiceProvider
     {
         // Boot up the theme system
         $themeService = $this->app->make(ThemeService::class);
+        $themeService->registerViewPathsForTheme($this->app->make('view')->getFinder());
         $themeService->readThemeActions();
         $themeService->dispatch(ThemeEvents::APP_BOOT, $this->app);
     }

app/Config/view.php

@@ -8,12 +8,6 @@
  * Do not edit this file unless you're happy to maintain any changes yourself.
  */
 
-// Join up possible view locations
-$viewPaths = [realpath(base_path('resources/views'))];
-if ($theme = env('APP_THEME', false)) {
-    array_unshift($viewPaths, base_path('themes/' . $theme));
-}
-
 return [
 
     // App theme
@@ -26,7 +20,7 @@ return [
     // Most templating systems load templates from disk. Here you may specify
     // an array of paths that should be checked for your views. Of course
     // the usual Laravel view path has already been registered for you.
-    'paths' => $viewPaths,
+    'paths' => [realpath(base_path('resources/views'))],
 
     // Compiled View Path
     // This option determines where all the compiled Blade templates will be

app/Theming/ThemeService.php

@@ -6,6 +6,7 @@ use BookStack\Access\SocialDriverManager;
 use BookStack\Exceptions\ThemeException;
 use Illuminate\Console\Application;
 use Illuminate\Console\Application as Artisan;
+use Illuminate\View\FileViewFinder;
 use Symfony\Component\Console\Command\Command;
 
 class ThemeService
@@ -90,6 +91,15 @@ class ThemeService
         }
     }
 
+    /**
+     * Register any extra paths for where we may expect views to be located
+     * with the provided FileViewFinder, to make custom views available for use.
+     */
+    public function registerViewPathsForTheme(FileViewFinder $finder): void
+    {
+        $finder->prependLocation(theme_path());
+    }
+
     /**
      * @see SocialDriverManager::addSocialDriver
      */