[Haskell-cafe] how to generate source code from TH Exp?

[Serguey Zefirov]

Just pretty-print a Exp.

It seems that "show $ ppr exp" will produce exactly what you need.

The same goes for Dec (declarations), etc.

2011/5/12 Stefan Kersten <sk at k-hornz.de>:
> hi,
>
> i was wondering if it's possible to directly generate Haskell source code
> from a Template Haskell `Q Exp', i.e. use TH as a kind of preprocessor? i am
> asking because currently the iOS port of ghc doesn't support TH and i need
> to generate some instances for the persistent package [1,2].
>
> i've been toying with
>
> fmap ppr . runQ $ q
>
> but the result needs to be edited by hand quite a bit. any ideas where to
> start?
>
> thanks,
> <sk>
>
> [1] http://hackage.haskell.org/package/persistent
> [2] http://hackage.haskell.org/package/persistent-template
>
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