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# Configuration for nix

{ config, pkgs, lib, ... }:
let
    unstableTarball = fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
in
{
    # cleanup nix store after every build
    nix.settings.auto-optimise-store = true;

    # confgure garbage collector of nixos
    # to run weekly
    nix.gc = {
        automatic = true;
        dates = "weekly";
        options = "--delete-older-than 30d";
    };

    # enable unstable packages
    nixpkgs.config = {
        packageOverrides = pkgs: with pkgs; {
            unstable = import unstableTarball {
                config = config.nixpkgs.config;
            };
        };
    };
}