... and this is a Ruby program that generates Scala program that generates Scheme program that generates ...(through 100 languages in total)... REXX program that generates the original Ruby code again.
If you are looking for E-Books about programming, check out @javaebooks.
It's run by a member of @theprogrammingartgroup and has a really good and wide selection of books about almost all topics (Algorithms, Data Structure, C, C++, Java, Android, PHP, .NET, Interviews and much more).
He helped us out a lot by sharing our group in the beginning, so check out his channel!