From: Igor Pirnovar <gooigpi@...>
Date: 2009-02-20T09:03:41+09:00
Subject: Re: ASCII Menu in Ruby, is it possible?

If you are planning to do some data entry checking on Linux platforms 
you may need to set the STDOUT.sync = true. I am including a simple 
program to show you the difference. Indeed on MS Windows you will not 
experience any difference if you comment out "STDOUT.sync = true"; on 
Linux if buffering is turned on you will!

> STDOUT.sync = true

#!/usr/bin/env ruby

STDOUT.sync = true  # (cross-platform compatibility issue)

loop do
  print "\n\n\tPLEASE SELECT:\n\n"
  print "\t\t(1) ..... enter one number\n"
  print "\t\t(2) ..... enter two numbers "
  print "(no seoarators like commas, ...)\n"
  print "\t\t(Q) ..... Quit\n\n"
  print "\tPlease select one of the above: "
  answer = gets
  printf "You've selected %s\n", answer

  case answer.chomp
  when "1"
    num = nil
    while num !~ /\d+.*[^\d]*/
      print "Please enter a single number: "
      num = gets
      num.chomp!  # note exclamation mark (!)
      if num.split(/\s+/).size != 1|| num !~ /\d+/
        puts  "You should have entered a single number not [#{num}]"
        print "Press <Enter> to continue "
        any = gets
      else
        puts "Thank you for [#{num}]."
      end
    end
  when "2"
    num = nil
    while num !~ /\d+[\s,]+\d+/
      print "Please enter two numbers: "
      num = gets
      num.chomp!  # note exclamation mark (!)
      if num.split(/\s+/).size != 2 || num !~ /\d+\s+\d+/
        puts  "You must enter two numbers number, not [#{num}]"
        print "Press <Enter> to continue "
        any = gets
      else
        puts "Thank you for [#{num}]."
      end
    end
  when /q|Q/
    exit
  else
    print "Illegal selection; Please try again! "
    print "Please enter a single number:\n"
    print "Press <Enter> to continue "
    any = gets
  end
end

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