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I'm trying so set up a NixOS VM for code development in haskell, and got into troubles with the basic installation of both xmonad and emacs. The relevant part of my /etc/nixos/configuration.nix is

environment.systemPackages = with pkgs; [
    emacs
    emacs24Packages.haskellMode
    xlibs.xmessage
    haskellPackages.haskellPlatform.ghc
    haskellPackages.xmobar
    haskellPackages.xmonad
    haskellPackages.xmonadContrib
    haskellPackages.xmonadExtras
];

  • xmonad: when I try to compile the code, xmonad complains that it couldn't find the module XMonad.Util.EZConfig. Compiling xmonad.hs with ghc is ok, and I'm also able to load the module into ghci. On the #nixos channel, I was told to use the function ghcWithPackages, but I wasn't able to correct the problem. Moreover, I'd like to understand why there is this problem in the first place, as it seems to me that this is a very simple use case. A minimal xmonad.hs with which I have the problem is:

    import XMonad
import XMonad.Util.EZConfig

main = xmonad $ defaultConfig
  { modMask = mod4Mask
  , terminal = "konsole"
  }
  `additionalKeysP`
  [ ("M-e", spawn "emacs")
  , ("M-f", spawn "firefox")
  ]

  • emacs: after the installation of the package haskellmode (look at the configuration.nix above), I'm not able to enter haskell-mode in emacs.

I put together these problems as I suspect they're both caused by a fundamental incomprehension of something on my behalf, so the cause may be common.

meditans
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3 Answers3

4

just add 

    windowManager.xmonad.enableContribAndExtras = true;

to 

    /etc/nixos/configuration.nix

Then start xmonad the usual way through your .xsession file

rmoro
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2

I can't add comment for now... But I think it's a problem with cabal local and global repositories.

As I see, "Nix allows users to install packages without requiring root privileges, and provides each user with its own view of the set of installed packages. Multiple versions of a program or library can be installed at the same time. Package upgrades are atomic and can be rolled back."

Maybe you can use ghc-pkg list to see if, in root and normal user, the packages are well installed.

grwp
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    Thank you for the reply. In the end I solved this with the help of the kind guys on #nixos. The point was that I had to add the line `windowManager.xmonad.enableContribAndExtras = true;`. This is because the packages installed in ghc are kept separate from those needed by xmonad to permit the installation of xmonad even without all the haskell infrastructure – meditans May 21 '14 at 23:43
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    @meditans - if you turn this comment into an answer and mark it as accepted it'll help make it clear the problem is solved. – Ganesh Sittampalam May 23 '14 at 05:41
1

I am unsure why you're unable to compile that... I can't offer a solution, but personally, I am able to compile my XMonad config which includes

import XMonad.Util.EZConfig

This is the relevant lines in my configuration.

    environment.systemPackages = with pkgs; [
      haskellPackages.xmobar
      haskellPackages.xmonad
      haskellPackages.xmonad-contrib
      haskellPackages.xmonad-extras
    ];

    programs.dconf.enable = true;

    services = {
      dbus = {
        enable = true;
        packages = [ pkgs.dconf ];
      };

      xserver = {
        enable = true;

        libinput = {
          enable = true;
          touchpad.disableWhileTyping = true;
        };

        serverLayoutSection = ''
          Option "StandbyTime" "0"
          Option "SuspendTime" "0"
          Option "OffTime"     "0"
        '';

        displayManager = {
          defaultSession = "none+xmonad";
          lightdm.enable = true;
          lightdm.greeters.mini.enable = true;
        };

        windowManager.xmonad = {
          enable = true;
          enableContribAndExtras = true;
        };

        xkbOptions = "caps:ctrl_modifier";
      };
    };

    env = {
      XMONAD_CONFIG_DIR = "$XDG_CONFIG_HOME/xmonad";
      XMONAD_CACHE_DIR = "$XDG_CONFIG_HOME/xmonad";
      XMONAD_DATA_DIR = "$XDG_CONFIG_HOME/xmonad";
    };

As someone pointed out, it might be because you don't have the line:

enableContribAndExtras = true;

I posted my configuration also so you could see how this would tie into a more extensive configuration, in this case for lightdm.

Christina Sørensen
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