gistfile1.rb

require 'digest/sha1'

def suffix(seqnum)
  o = ""
  5.times do
    o << (33 + (seqnum % 93)).chr
    seqnum /= 93
  end
  return o
end

# apply_mask("ab",1) #=> 'Ab'
# but not working on ruby*12
def apply_mask(sentence,mask)
 i = 0
 sentence.gsub(/\S/) do |char|
   char = char.swapcase if mask[i] == 1 
   i += 1
   char
 end
end

def sha1(phrase)
  Digest::SHA1.hexdigest(phrase)
end
 
def suffix(seqnum)
  o = ""
  5.times do
    o << (33 + (seqnum % 93)).chr
    seqnum /= 93
  end
  return o
end

def suffix_to_seqnum(str)
  total = 0
  str.split('').map {|c| c[0] - 33 }.each_with_index do |num,i|
    total += num * 93 ** i
  end
  return total
end
 
class PhraseGenerator
  
  def initialize(case_seqnum=0,suffix_seqnum=0)
    @words = ["ruby"]*12
    @phrase = apply_mask(@words.join(' '),case_seqnum)
    @case_seqnum   = case_seqnum
    @suffix_seqnum = suffix_seqnum
  end
  
  def permute_suffix
    if ((@suffix_seqnum += 1) > 6956883693)
      @suffix_seqnum = 0
      return false
    else
      return true
    end
  end
  
  def permute_caps
    @case_seqnum += 1
    @phrase = apply_mask(@words.join(' '),@case_seqnum)
  end
  
  def next
    suffix=suffix(@suffix_seqnum)
    full_phrase = "#{@phrase} #{suffix}"
    hash = sha1(full_phrase)
    rec = "#{hash},#{@case_seqnum},#{suffix}"
    
    # permute something.
    unless permute_suffix
      permute_caps
    end
 
    return rec
  end    
end
 
case_num = ARGV.shift.to_i || 0
suff_num = suffix_to_sum(ARGV.shift || '!!!!!')
pg = PhraseGenerator.new(case_num,suff_num)
loop do 
  puts pg.next
end