Hi Peter! I see that you're on NixOS as well. You might remember me from the Arch-Haskell list some time ago...
On Tue, Nov 29, 2011 at 06:02:33PM +0100, Peter Simons wrote: > Hi Linus, > > > But I must ask, how did you install xmonad? I tried "nix-env -i > > xmonad" but it did not work [...] > > Haskell packages that contain library code generally depend on the > version of the compiler they've been built with. Almost all Haskell > packages have the appropriate compiler version baked into their package > name. Consequently, there are many different versions of XMonad: > > $ nix-env -qaP \* | grep xmonad-ghc > haskellPackages_ghc6104.xmonad > haskell-xmonad-ghc6.10.4-0.10 > haskellPackages_ghc6123.xmonad > haskell-xmonad-ghc6.12.3-0.10 > haskellPackages_ghc704_no_profiling.xmonad > haskell-xmonad-ghc7.0.4-0.10 > haskellPackages_ghc704_profiling.xmonad > haskell-xmonad-ghc7.0.4-0.10-profiling > haskellPackages_ghc721.xmonad > haskell-xmonad-ghc7.2.1-0.10 > haskellPackages_ghc722.xmonad > haskell-xmonad-ghc7.2.2-0.10 > > Which version is preferable to you depends on the compiler that you > prefer. At the moment, I would recommend to stick to GHC 7.0.4. Yes, I got this impression from seeing all the different xmonad/ghc packages with the different versions. I did $ nix-env -qa \* > pkgs and kept that file around as a sort of primitive reference for all the available packages, and that's how I learned about all the different versions. I did something like $ nix-env -i haskell-xmonad-ghc7.0.4 $ nix-env -i haskell-ghc7.0.4 to get my Haskell packages installd. > > Strangely, it appears that the haskell packages cannot see each other > > properly, because I cannot use any of the xmonad-contrib modules in > > my xmonad.hs, even though I've installed xmonad-contrib. I can fire > > up ghci, but I can't even load up the "XMonad" Haskell module, > > either. Strange... > > I cannot reproduce that problem: > > $ nix-env -iA haskellPackages.{xmonad,ghc} > installing `haskell-xmonad-ghc7.0.4-0.10' > installing `ghc-7.0.4-wrapper' > building path(s) > `/nix/store/6k520bqkbmcbqgl1s1371jr7zj2774b9-user-environment' > created 7452 symlinks in user environment > $ ghci > GHCi, version 7.0.4: http://www.haskell.org/ghc/ :? for help > Loading package ghc-prim ... linking ... done. > Loading package integer-gmp ... linking ... done. > Loading package base ... linking ... done. > Loading package ffi-1.0 ... linking ... done. > Prelude> :m XMonad > Prelude XMonad> :browse > (-->) :: (Monad m, Data.Monoid.Monoid a) => m Bool -> m a -> m a > class Num a => Data.Bits.Bits a where > [...] If I had known about the simple "haskellPackages.foo" syntax I would have used it with my nix-env invocations! Another thing to add to the wiki... Strangely, I can't use this convenient syntax, because nix throws an error: $ nix-env -iA haskellPackages.{xmonad,ghc} error: attribute `haskellPackages' in selection path `haskellPackages' not found I've already done a nixos-checkout, so, I don't understand why my freshly-installed NixOS is coughing up this error... > Generally speaking, GHC can see all Haskell packages that have been > installed into the same profile as the compiler itself. Evidently, my newbie, trial-and-error attempt to install xmonad/ghc with nix-env has already broken my Haskell-package setup... I just read the manual for nix-env to find out more about the -A flag, and found this sentence: "To find out the attribute paths of available packages, use nix-env -qaA '*'." Unfortunately, this does not work for me: $ nix-env -qaA '*' warning: you probably meant to specify the argument '*' to show all packages error: attribute `*' in selection path `*' not found It appears that something has gone horribly wrong... -Linus P.S. I apologize in advance for any typos in the error messages/console output --- the problematic NixOS install on my spare laptop is not in a workable state so I'm just copying everything by hand into another laptop to send these emails. _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev