りょうめん！

ryoumen.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

begin
  page = ARGV[0].to_i

  raise 'invalid arguments' if page <= 0 || page % 4 != 0

  column_width = 5
  row_width = 17

  result = ['=' * row_width]

  (page / 2).times do |i|
    remainder = i % 2

    numbers = [
        ("%03d" % (page - i)).center(column_width),
        ("%03d" % (i + 1)).center(column_width)
      ]

    numbers.reverse! if remainder == 0

    result << "| %s | %s |" % numbers << %w|- =|[remainder] * row_width
  end

  puts result.join "\n"
rescue 
  STDERR.puts $!.message
end

ryoumen.txt

$ ./ryoumen.rb 24
=================
|  001  |  024  |
-----------------
|  023  |  002  |
=================
|  003  |  022  |
-----------------
|  021  |  004  |
=================
|  005  |  020  |
-----------------
|  019  |  006  |
=================
|  007  |  018  |
-----------------
|  017  |  008  |
=================
|  009  |  016  |
-----------------
|  015  |  010  |
=================
|  011  |  014  |
-----------------
|  013  |  012  |
=================