How can I detect a user's input language using Ruby without using an online service?

Question

I\'m looking for a library or technique to detect the input language of blocks of text provided by users. Online lookups (like Google translate) won\'t work for this task as

Answer 1

A quick demo of WhatLanguage in Ruby:

http://www.youtube.com/watch?v=lNqZ2cqOReo&list=UUJ_3fstMOH-g4yBxtvgAWkw&index=0&feature=plcp