LettersMixer - simple letters mixing

lettersmixer.rb

# encoding: UTF-8
module LettersMixer

  REGEXP = /[A-zА-я]{2,}/
  DEFAULT_MODE = :shuffle

  module Modes
    def self.full_shuffle(word, options = {})
      word.split("").shuffle(options).join
    end

    def self.full_sort(word, options = {})
      load_active_support
      word.split("").sort{|a,b| a.mb_chars.downcase.to_s <=> b.mb_chars.downcase.to_s}.join
    end


    def self.shuffle(word, options = {})
      return if word.length <= 2
      word[1..-2] = full_shuffle(word[1..-2], options)
      word
    end

    def self.sort(word, options = {})
      return if word.length <= 2
      word[1..-2] = full_sort(word[1..-2], options)
      word
    end

    private

    # Used for downcasing
    def self.load_active_support
      $active_support_loaded ||= require "active_support/core_ext"
    end
  end

  def self.rebuild_text(text, options = {})
    options[:regexp] ||= REGEXP
    options[:mode]   ||= DEFAULT_MODE

    options[:mode] = options[:mode].to_sym

    raise "Unknown mode" unless Modes.respond_to?(options[:mode])
    text.gsub(options[:regexp]) do |word|
      new_word = Modes.send(options[:mode], word)
      new_word || word
    end
  end
end

if $0 == __FILE__
  print LettersMixer.rebuild_text(File.read(ARGV[0], :encoding => 'utf-8'), mode: ARGV[1])
end