I see that there is a flake for NixOS users #515

refaelsh · 2024-09-28T19:35:44Z

refaelsh
Sep 28, 2024

I use Nixos, btw.
Currently I have this in my config:

    services.xserver.windowManager.xmonad = {
      enable = true;
      enableConfiguredRecompile = true;
      enableContribAndExtras = true;
      extraPackages = haskellPackages: [
        haskellPackages.xmonad-contrib
        haskellPackages.xmobar
      ];
      config = builtins.readFile ./xmonad.hs;
    };

Everything is working fine.
But now, I discovered that there is a flake of Xmonad here: https://github.com/xmonad/xmonad-contrib/blob/master/NIX.md.
If I use the flake, I would have something like this:

  services.xserver.windowManager.xmonad = {
    enable = true;
    enableContribAndExtras = true;
    flake = {
      enable = true;
    # prefix = "unstable";
      compiler = "ghc924";
    };
  };

The questions:

Why would I use that flake? To save 2 lines of nix code in my configuration.nix?
It seems that, from time-to-time, I will need to manually update the compiler = "ghc924";? Manually --> bad thing.
I cant seems to find the documentation of the NixOS module that seems provided with the flake.

Thanks in advance.

Answered by LSLeary

Sep 28, 2024

Directly below that example xmonad.flake config:

1:

This will use core and contrib from git for your system xmonad, building your config with the compiler of your choice.

That's it. It's an easy way to use xmonad from git-master or a PR branch or your local changes, with the GHC version of your choice.

2:

With the flake enabled, the xmonad.haskellPackages option is not used directly, and is instead set by the flake.compiler option. When compiler is unset, the default pkgs.haskellPackages is used.

Setting compiler is optional; it doesn't need updating if you don't care about it.

3:

See the flakes themselves and nix flake documentation for full detail.

Sorry, but that NIX.md file and …

View full answer

LSLeary · 2024-09-28T21:54:49Z

LSLeary
Sep 28, 2024

Directly below that example xmonad.flake config:

1:

This will use core and contrib from git for your system xmonad, building your config with the compiler of your choice.

That's it. It's an easy way to use xmonad from git-master or a PR branch or your local changes, with the GHC version of your choice.

2:

With the flake enabled, the xmonad.haskellPackages option is not used directly, and is instead set by the flake.compiler option. When compiler is unset, the default pkgs.haskellPackages is used.

Setting compiler is optional; it doesn't need updating if you don't care about it.

3:

See the flakes themselves and nix flake documentation for full detail.

Sorry, but that NIX.md file and the contents of the flake.nix files themselves is all we got.

1 reply

refaelsh Sep 28, 2024
Author

I understand. Thank you very much :-)

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refaelsh Sep 28, 2024 Author

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Sep 28, 2024

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LSLeary
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refaelsh Sep 28, 2024
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