Before you reinvent the wheel, have you looked at Language.Haskell.Pretty?

http://haskell.org/ghc/docs/latest/html/libraries/haskell-src/Language-Haskell-Pretty.html

On Tue, Sep 16, 2008 at 10:30 AM, Mauricio <briqueabraque@yahoo.com> wrote:
Hi,

I would like to write a Haskell pretty-printer,
using standard libraries for that. How can I
check if the original and the pretty-printed
versions are the same? For instance, is there
a file generated by GHC at the compilation
pipe that is always guaranteed to have the
same MD5 hash when it comes from equivalent
source?

Thanks,
Maurício

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/jve