Pagekit\System\SystemModule::main PHP Method

    public function main(App $app)
    {
        $app['system'] = $this;
        $app['isAdmin'] = false;
        $app->factory('finder', function () {
            return Finder::create();
        });
        $app->extend('assets', function ($factory) use($app) {
            $secret = $this->config['secret'];
            $version = substr(sha1($app['version'] . $secret), 0, 4);
            $factory->setVersion($version);
            return $factory;
        });
        $theme = $this->config('site.theme');
        $app['module']->addLoader(function ($module) use($app, $theme) {
            if (in_array($module['name'], $this->config['extensions'])) {
                $module['type'] = 'extension';
                $app['locator']->add("{$module['name']}:", $module['path']);
                $app['locator']->add("views:{$module['name']}", "{$module['path']}/views");
            } else {
                if ($module['name'] == $theme) {
                    $module['type'] = 'theme';
                    $app['locator']->add('theme:', $module['path']);
                    $app['locator']->add('views:', "{$module['path']}/views");
                }
            }
            return $module;
        });
        foreach (array_merge($this->config['extensions'], (array) $theme) as $module) {
            try {
                $app['module']->load($module);
            } catch (\RuntimeException $e) {
                $module = ucfirst($module);
                $app['log']->error("[{$module} exception]: {$e->getMessage()}");
            }
        }
        if (!($app['theme'] = $app->module($theme))) {
            $app['theme'] = new Module(['name' => 'theme-default', 'type' => 'theme', 'path' => '', 'config' => [], 'layout' => 'views:system/blank.php']);
        }
    }