public function run()
	{
		if (!is_dir($this->path)) {
			$message = 'The directory with CSS files was not found.';

		} elseif (!$this->findCssFiles($this->path)) {
			$message = 'The directory does not contain any CSS files.';

		} else {
			$this->applyCssRules($this->findCssFiles($this->path), $this->filename);
			$file = 'CSS file: ' . $this->filename . ' size: ' . filesize($this->filename) . ' Bytes were generated.';
		}
		return print isset($file) ? $file : $message;
	}