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My approach isn't terribly complex, but it was fun to write.  It
requires that you have a plain text file "book.txt" in the directory of
execution.  I used http://www.gutenberg.org/dirs/etext91/alice30.txt for
all of my tests and my favorite phrase that it came up with was:

Beautiful soup beauootiful soooop soooop of evidence said the queen turning to the dormouse.

How is works is loads each word into a hash stripping punctuation and
capitalization associating each word with an array of common words that
it is followed by.  One word is picked by random to start us off then it
picks randomly commonly chained words from there till it ends up with a
word that was at the end of sentence in the original document.

Kind Regards,
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Barry Dmytro
badcherry / mailc.net
http://badcherry.org/
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#!/usr/bin/env ruby

class Array
	def rand
		self[Kernel::rand(self.size-1)]
	end
end

words = {}

File::open("book.txt") do |f|
	book = f.read.gsub(/\n/,"")
	arr = book.split
	arr.each_with_index do |word,index|
		eos = false
		eos = true if word[word.size-1].chr == "."
		word = word.gsub(/\W/,"").downcase
		words[word] = [] unless words.has_key? word
		if eos == true then
			words[word] << :EOS
		elsif arr.size-1 != index then
			next_word = arr[index+1]
			next_word = next_word.gsub(/\W/,"").downcase
			words[word] << next_word
		else
			words[word] << :EOS
		end
	end
end

word = words.keys.rand
state = word.capitalize
while true
	word = words[word].rand
	break if word == :EOS
	state << " " << word
end
puts state + "."

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