ghc-pkg query feature request

Simon Marlow simonmar at
Tue Jul 26 06:23:36 EDT 2005

On 26 July 2005 09:23, Lennart Kolmodin wrote:

> When working with multiple versions of a package you often want to use
>    the most recent version.
> A feature that would help for package systems is to be able to query
> ghc-pkg for the best version, or to list the versions in increasing
> version order.
> Something like:
> $ ghc-pkg best_version Cabal
> Cabal-1.1.1
> $ ghc-pkg versions Cabal
> Cabal-1.0 Cabal-1.1.1
> You get the picture. Obviously, this feature isn't critical since we
> could use 'ghc-pkg list' and work our way from there, but it would be
> nice. If you like the idea we might send you a patch.
> What do you think?

Sure, I'll commit a patch if you send one.  Perhaps 

  $ ghc-pkg list Cabal
  Cabal-1.0 Cabal-1.1.1

would be the simplest extension?


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