core/app/Providers/AppServiceProvider.php

<?php

namespace App\Providers;

use App\Handlers\Registrators\SearchEngineRegistrator;
use App\Handlers\Registrators\SettingsExtensionRegistrator;
use App\Handlers\Registrators\TemplateRegistrator;
use App\Handlers\Registrators\WidgetRegistrator;
use App\Handlers\Search\Content;
use App\Handlers\Search\Files;
use App\Handlers\Search\Presenters\AdminContent as AdminContentPresenter;
use App\Handlers\Search\Presenters\AdminFiles;
use App\Widgets\HtmlCode\HtmlCode;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        $this->registerWidgets();
        $this->registerTemplates();
        $this->registerSettings();
        $this->registerSearch();
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        if ($this->app->environment() == 'local') {
            $this->app->register('Iber\Generator\ModelGeneratorProvider');
            $this->app->register('Barryvdh\Debugbar\ServiceProvider');
        }

        // register PingPong module extension
        $this->app->register('Pingpong\Modules\ModulesServiceProvider');
        $this->app->register('Pingpong\Menus\MenusServiceProvider');

        // create singletons for registering widgets
        $this->app->singleton('registerWidget', function ($app) {
            return new WidgetRegistrator($app);
        });

        // create registrator for template directories
        $this->app->singleton('registerTemplateDir', function ($app) {
            return new TemplateRegistrator($app);
        });

        $this->app->singleton('registerSettingsExtension', function ($app) {
            return new SettingsExtensionRegistrator($app);
        });

        $this->app->singleton('registerSearchEngine', function ($app) {
            return new SearchEngineRegistrator($app);
        });
    }

    /**
     * Method for registering widgets.
     */
    private function registerWidgets()
    {
        /**
         * @var $registrator WidgetRegistrator
         */
        $registrator = $this->app->make('registerWidget');

        // register all available widgets
        $registrator->register(HtmlCode::class);
    }

    /**
     * Register path with editable contents
     */
    private function registerTemplates()
    {
        /**
         * @var $registrator TemplateRegistrator
         */
        $registrator = $this->app->make('registerTemplateDir');
        $registrator->setBaseDirectory('resources/views/visitor');

        $registrator->register(config('app.theme'), 'admin/templates.core');
    }

    /**
     * Register setting sections
     */
    private function registerSettings()
    {
        $registrator = $this->app->make('registerSettingsExtension');

        $registrator->register('basic', 'admin/settings.basic', 'admin.settings.parts.basic');
        $registrator->register('meta', 'admin/settings.meta', 'admin.settings.parts.meta');
    }

    /**
     * Register callbacks used for searching
     */
    private function registerSearch()
    {
        $registrator = $this->app->make('registerSearchEngine');

        $registrator->register(new Content(), new AdminContentPresenter(), SearchEngineRegistrator::ADMIN);
        $registrator->register(new Files(), new AdminFiles(), SearchEngineRegistrator::ADMIN);
    }
}