https://github.com/facebook/pfff is a tool which support pretty printing a bunch of different languages (currently c, c++, java, js, php, python, rust, and a bunch more).

The idea is to have a common AST (with parsers for each language) which keeps track of whitespace/comments/etc and then share a ton of logic by writing writing code at the AST layer.

You can use pfff to pretty print according to your style needs. Also supports a bunch of other neat things such as search/replace.