[Haskell-cafe] On Haskell IDEs

[Maxim Kulkin]

ghc package depends on exact version of Cabal pacakge. I understand why old
package depends on some other old package. I just don't understand why GHC
depends on Cabal.


On Tue, Mar 11, 2014 at 11:26 AM, Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk
> wrote:

> On 11/03/14 07:19, Maxim Kulkin wrote:
> > I played a bit with GHC API and Cabal (and even implemented .cabal
> support
> > for hdevtools) and now I see issues with this approach:
> >
> > 1. GHC depends on Cabal (rly?) and this is most likely some old version
> of
> > Cabal, not the one you use currently (e.g. I use cabal-install and Cabal
> > 1.18, but GHC 7.6.3 -- the latest stable -- depends on Cabal 1.16). This
> > makes it hard to develop tools that both use GHC API and latest Cabal.
> > Hopefully this dependency will be removed in future versions of GHC.
>
> Actually, 1.16 was the bleeding edge release when 7.6.3 came out so
> technically it was new. Old compiler depends on an old version, I don't
> see why you find this odd. 7.8 will ship with a newer version (whether
> we like this or not).
>
> Having said that, I don't think GHC API depends on Cabal API, does it?
>
> > 2. Sometimes you get stuck with types and can't get source code compile
> and
> > GHC API-based tools are of no help in this situation, because they won't
> be
> > able to provide type for some variable in source file because this source
> > file contains a syntax/type error in some other part. I'm not sure if GHC
> > API can be tweaked to bypass errors and do the best effort of
> > parsing/desugaring of other parts of sources with errors. Maybe some
> > external parser (haskell-src-exts) should be used for source inspection.
> >
>
>
> --
> Mateusz K.
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