public function actionView()
{
$model = Document::read($this->path);
if (is_null($model) || $model->extension != 'md') {
throw new \yii\web\HttpException(404, 'File dosn\'t exists');
}
$breadcrumbs = Folder::pathToBreadcrumbs($this->path);
return $this->render('view', ['model' => $model, 'breadcrumbs' => $breadcrumbs]);
}
