This is part of the DarcsLibraries agenda of stripping everything out of Darcs
that isn't about patches or repositories.
 http://wiki.darcs.net/DarcsLibraries

A possible first choice might be Text.PrettyPrint.HughesPJ (pretty).

Please propose answers to:
1. How to ensure compatibility (i.e. that we're not subtly changing on disk
patch representation [I'm assuming we use the printers for that]
2. How to get colour
3. How to have fine-grained control being able to disable colour in certain
contexts, with environment variables for example or just by virtue of printing
to a file

One option might actually be to take *our* printer module and turn in into a
standalone one first and then slowly replace components.

I'm making Nicolas nosy on this, because I think he's commented on this before.

See also issue40 for some fanciness

What is the state of third-party Printer libraries as of now?

Anyone knows an appropriate one? Shoot your proposals.

A comment from Petr on IRC:

-----8<-----
06:53	mornfall	Re issue 1598: I have picked something for patchlib,
maybe have a look...
06:54		(I.e. patchlib is not using Printer from darcs, but something
from hackage with a few compat things...)
----->8-----

See http://repos.mornfall.net/patchlib/Text/PrettyPrint.hs

g.