[Haskell-cafe] Custom Setup.hs and Paths module

[Daniel Díaz Casanueva]

Hello Erik.

Yes, that solution may work, but seems ad-hoc to me. I would like to see a
way to actually import the Paths module. In the meanwhile, I will be using
your idea. Thank you for the response.

Anybody knows how to hack the Setup.hs so I can use the real Paths module?


On Wed, Jul 3, 2013 at 3:39 AM, Erik de Castro Lopo <mle+hs at mega-nerd.com>wrote:

> Daniel Díaz Casanueva wrote:
>
> > Hi everyone.
> >
> > I am writing a package where I am using the Paths module that cabal
> > generates automatically. After adding the Paths module to the
> > "other-modules" section in my cabal file everything worked just fine,
> until
> > I wanted to write a custom Setup.hs. This Setup.hs just writes a couple
> of
> > files in the system and then calls "defaultMain". The thing is that now
> > "cabal install" does not find the Paths module, so the package is broken.
>
> I ran into the same problem. I ended up fixing it by *not* using the auto
> generated Paths module and instead parsing the cabal file in Setup.hs.
>
> This is not has horrible as it sounds as I used the Cabal insfrastructure
> to do it. Basically something like this:
>
>     import Distribution.Simple
>     import Distribution.PackageDescription
>     import Distribution.PackageDescription.Parse (readPackageDescription)
>     import Distribution.Verbosity (silent)
>
>     version <- fmap (showVersion . pkgVersion . package .
> packageDescription)
>                     $ readPackageDescription silent "my-package.cabal"
>
> and then used that version String to write a trivial 5 line file
> Version.hs.
>
> HTH,
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
>
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