[Nix-dev] Correct XMonad Configuration

[Taeer Bar-Yam]

Are you on the unstable channel? You might want to consider switching to it.
Using:
$ nix-channel --remove nixos
$ nix-channel --add https://nixos.org/channels/nixos-unstable nixos

I ran into the same exact issue, and I'm pretty sure there was a workaround using the stable channel (which I don't remember, sorry), but that this problem has been actually fixed in the unstable channel, and in fact, this is my entire xmonad setup (in configuration.nix):
    windowManager.default = "xmonad";
    windowManager.xmonad = {
      enable = true;
      enableContribAndExtras = true;
    };
I don't even need extraPackages.

Hope that helps,
  --Taeer

> On Jan 10, 2016, at 10:05 AM, Sergiu Ivanov <sivanov at colimite.fr> wrote:
> 
> 
> Dear NixOS Community,
> 
> My name is Sergiu; I teach Computer Science and do research in
> Theoretical Computer Science.  I have some experience with Haskell
> development.  I came across NixOS quite some time ago and now I finally
> have the opportunity to install it and maybe even try to contribute :-)
> 
> I attach my configuration.nix; here's the XMonad-related snippet:
> 
> 
>  services.xserver.windowManager.xmonad = {
>    enable = true;
>    enableContribAndExtras = true;
>    extraPackages = self: [
>      self.xmonad-contrib
>      self.xmonad-extras
>    ];
>  };
> 
> 
> When I try to xmonad --recompile the following xmonad.hs:
> 
> 
>  import XMonad
>  main = xmonad defaultConfig
>         { terminal = "termite"
>         , modMask = mod4Mask
>         , focusedBorderColor = "blue"
>         }
> 
> 
> I get the error message that the module XMonad could not be found.
> 
> I would like to minimise the number of Haskell packages installed at the
> system level, so I don't add any to environment.systemPackages.  Yet,
> adding xmonad, xmonad-contrib, and xmonad-extras to
> environment.systemPackages (and haskellPlatform, FWIW) doesn't change
> anything for me (I still get the error).
> 
> I tried cabal installing xmonad, xmonad-contrib, and xmonad-extras in a
> Cabal sandbox, but I got an error about missing X11 libraries.
> 
> I haven't tried ghcWithPackages yet, because I'm really not sure it's
> going to help me: after all, I'm not compiling my xmonad.hs with GHC (at
> least I don't seem to be).  And then people seem to have been able to
> address the issue without ghcWithPackages [0].
> 
> Do you see anything flagrant with my setup?
> 
> -- 
> Sergiu
> 
> <configuration.nix>
> [0] https://github.com/NixOS/nixos/issues/194
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