protected function addCell($text, $wrap = ['', '']) {
        if ($this->currentRow === null) {
            $this->row();
        }

        $i = count($this->currentRow);
        $this->columnWidths[$i] = max(strlen($text), Cli::val($i, $this->columnWidths, 0)); // max column width

        $this->currentRow[$i] = [$text, $wrap];
        return $this;
    }