protected function _progressBar()
    {
        if ($this->_current > $this->_total) {
            return;
        }

        $percent = $this->_current / $this->_total;
        $nb = $percent * $this->_size;

        $b = str_repeat($this->_chars['bar'], floor($nb));
        $i = '';

        if ($nb < $this->_size) {
            $i = str_pad($this->_chars['indicator'], $this->_size - strlen($b));
        }

        $p = floor($percent * 100);

        $string = Text::insert($this->_format, compact('p', 'b', 'i'));

        $this->write("\r" . $string, $this->_color);
    }