gistfile1.rb

  files.sort! do |a, b|
    version_aware_compare(a, b)
  end

  def version_aware_compare(a, b)
    lhsegments = to_segments(a)
    rhsegments = to_segments(b)
    lhsize = lhsegments.size
    rhsize = rhsegments.size
    limit  = (lhsize > rhsize ? lhsize : rhsize) - 1

    0.upto(limit) do |i|
      lhs, rhs = lhsegments[i] || 0, rhsegments[i] || 0

      return  -1         if String  === lhs && Numeric === rhs
      return   1         if Numeric === lhs && String  === rhs
      return lhs <=> rhs if lhs != rhs
    end

    return 0
  end

  def to_segments(filename)
    filename.scan(/\d+|\D+/).map do |s|
      s =~ /^\d+$/ ? s.to_i : s
    end
  end