原稿用紙枚数換算シンプル

genko.rb

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

GYO   = 20
RETSU = 20

num_letters = num_gyo = num_retsu = 0

open(ARGV.last) do |io|
  io.each_char do |c|
    if c.match(/\r?\n/)
      num_gyo += 1
    else
      num_retsu += 1
      num_letters += 1
      if num_retsu >= RETSU
        num_gyo += 1
        num_retsu = 0
      end
    end
  end
end

div, mod = num_gyo.divmod(GYO)

puts <<-RESULT
文字数#{num_letters}
行数#{num_gyo}
枚数#{div}枚と#{mod}行
RESULT