[I could live with pretty printing, but the default prettyPrint gives me a very strange formatting where something like:

main = do

  putStrLn "Hello"

becomes:

main = do putStrLn "Hello"]

The closest I've got is to parse the file with comments and then get inside Module ...decls and do printExact with an empty comment list for the decl I'm interested in. This gives me the original formatting and empty lines where comments were that I can then remove.

But if there was anything already out there that just take a String for the toplevel I'm interested in and convert that only, I'd love to know.