one pretty printer “to rule them all”

Question

I\'m looking for a tool that can pretty-print (AKA tidy or beautify) source code in as many languages as possible. Those I\'m particularly keen on include:

• Jav

Answer 1

For Haskell, I have this in ~/bin/pp.hs:

#!/usr/bin/env runhaskell
module Main (main) where
import Language.Haskell.Parser
import Language.Haskell.Pretty
import System.Environment
pp f = case parseModule f
        of ParseOk m -> prettyPrint m
           a -> show a
main = do args <- getArgs
          mapM_ (>>= putStrLn . pp) $
            if null args then [getContents] else map readFile args

In Vim, :set equalprg=~/bin/pp.hs, select a region, hit =, and boom, it gets prettified.

Okay, it's not very general. But I figure it has a small chance of helping somebody if I add it here.