On Tue, 2010-06-15 at 20:43 +0200, JP Moresmau wrote:
Hello, I was wondering if there are instances for Typeable and Data available somewhere for GenericPackageDescription. Automatic deriving fails, probably, if I read the docs right, because some types in there have more than 7 parameters. It would help me to use the cabal file parsing functions and convert the result automatically to JSON for use in Eclipse through Scion. Of course if there isn't I suppose I can write my own instances and maybe share them with who ever is interested.
I'm happy to accept patches. One thing to keep in mind is that the Cabal library must be compilable with hugs and nhc98 as well as ghc. I think that means we cannot use deriving Typeable or Data since, as far as I know, neither of those compilers supports that language extension. Note that the ModuleName constructor is not exported on purpose. Do Data instances make sense for abstract types? Duncan