expandtabs ruby

expandtabs ruby

class String
  # like python expandtabs
  def expandtabs tabsize=8
    self.gsub(/[^\r\n]*/) do |line|
      next line if line == ''
      ss = line.split("\t", -1)
      next line if ss.size == 1
      sa = []
      lasts = ss.pop
      ss.each do |s|
        sa << s
        m = s.b.size % tabsize    # FIXME. graph width 2, but utf-8 byte 3/4
        sa << ' ' * ( tabsize - m )
      end
      sa << lasts
      sa.join
    end
  end unless defined? expandtabs
end