justify

# File activesupport/lib/active_support/multibyte/handlers/utf8_handler.rb, line 427
      def justify(str, integer, way, padstr=' ')
        raise ArgumentError, "zero width padding" if padstr.length == 0
        padsize = integer - size(str)
        padsize = padsize > 0 ? padsize : 0
        case way
        when :right
          str.dup.insert(0, padding(padsize, padstr))
        when :left
          str.dup.insert(-1, padding(padsize, padstr))
        when :center
          lpad = padding((padsize / 2.0).floor, padstr)
          rpad = padding((padsize / 2.0).ceil, padstr)
          str.dup.insert(0, lpad).insert(-1, rpad)
        end
      end