public function level($level)
    {
        if ($level === null) {
            return $this;
        }
        
        $this->prepend = '   ' . (str_repeat('  ', $level));
        
        return $this;
    }
public function level($level)
    {
        if ($level === null) {
            return $this;
        }
        
        $this->prepend = '   ' . (str_repeat('  ', $level));
        
        return $this;
    }
public function level ( $ level ) { if ( $ level === null ) { return $ this ; } $ this -> prepend = '   ' . ( str_repeat ( '  ' , $ level ) ) ; return $ this ; }
Set the output's indentation level.

@param  int $level
@return \CupOfTea\TwoStream\Console\Output
Set the output s indentation level .