[Haskell-cafe] I wish cabal-dev to travel back in time

Simon Hengel sol at typeful.net
Sat May 11 11:25:33 CEST 2013


Personally I think we need something akin to Ruby's `Gemfile.lock`
mechanism (ideally directly integrated into Cabal).

Cheers,
Simon

On Sat, May 11, 2013 at 11:10:45AM +0200, Alberto G. Corona  wrote:
> Hi Café:
> 
> 
> 
> I created just now an issue in cabal-dev:
> 
> 
> 
> https://github.com/creswick/cabal-dev/issues/101
> 
> 
> 
> When compiling old developments, I wish cabal-dev to install and build
> dependencies that were available at a that time
> 
> I don't know if  there are alternatives to solving this issue. I think that
> this is very useful and necessary, specially now when library updates are
> increasingly frequent.
> 
> Maybe this problem is already solved and I just don´t know (as is often the
> case, for example when, in a sudden aha moment, I reinvented cabal-install
> months after the release). That is the reason why I tell you about it here
> in order to discuss it.
> 
> motivation:
> 
> I´m installing now an old soft development. Since many of my dependencies
> were labeled with -any or with > , neither I neither cabal know which
> library versions are the right ones. By taking into account a date
> parameter, cabal-dev can figure out which libraries were the latest and the
> right ones at that time.
> -- 
> Alberto.

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