If google is generating content that you will sell as a book yes. Legally you could get sued. Remember google uses the content under fair use for there service. You can't claim fair use when you try to sell someone elses code.
I agree that what Google does is considered fair use. They show your content as snippets and they gain knowledge about topics and improve their search engine based on your content. I don’t see a big issue with what Github is doing either, as long as it’s not a near duplicate of the original content.