[Nix-dev] Picking a GHC version to use

[Richard Wallace]

Thanks!  The -P option is what I was missing.  I think I'm starting to
get the hang of nix.  Now I just need to figure out how to manage
profiles so I can have one per project.  I'll ask that in a different
post.

Thanks again,
Rich

On Tue, Oct 30, 2012 at 9:39 AM, Vladimír Čunát <vcunat at gmail.com> wrote:
> On 10/30/2012 05:29 PM, Richard Wallace wrote:
>>
>> Ok, I guess I'm just not sure how to specify the compiler version.
>> When I ran `nix-env -qa | grep cabal-dev` after adding the .nix file
>> and modifying haskell-packages.nix, I saw something like 6
>> cabal-dev-0.9.1 possibilities.  I figured that those were different
>> derivations, but didn't know how to see more information about the
>> derivations or how to pick a specific one.
>
>
> When you add -P to nix-env -qa, you will also see attribute paths. These can
> be installed by adding -A to nix-env -i (the attr-paths are unique and their
> resolution is also quicker than by name).
>
> Some people also define things like "h = haskellPackagesXYZ" in their
> ~/.nix-defexpr/, so they can install stuff like "nix-env -iA h.pandoc". You
> can also create there some named favorite-package sets, e.g. those that you
> want to upgrade often, etc.
>
>
> Vlada
>
>
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