default.nix

{ inputs, config, lib, pkgs, ... }:
let inherit (lib) mapAttrs filterAttrs mapAttrsToList mkDefault mkIf;
in
{
  imports =
    # I use home-manager to deploy files to $HOME; little else
    [
      inputs.home-manager.nixosModules.home-manager
    ]
    # All my personal modules
    ++ (lib.my.mapModulesRec' (toString ./modules) import);

  # Common config for all nixos machines; and to ensure the flake operates
  # soundly
  environment.variables.DOTFILES = config.dotfiles.dir;
  environment.variables.DOTFILES_BIN = config.dotfiles.binDir;

  # Configure nix and nixpkgs
  environment.variables.NIXPKGS_ALLOW_UNFREE = "1";
  nix =
    let
      filteredInputs = filterAttrs (n: _: n != "self") inputs;
      nixPathInputs = mapAttrsToList (n: v: "${n}=${v}") filteredInputs;
      registryInputs = mapAttrs (_: v: { flake = v; }) filteredInputs;
    in
    {
      extraOptions = "experimental-features = nix-command flakes";
      nixPath = nixPathInputs ++ [
        "nixpkgs-overlays=${config.dotfiles.dir}/overlays"
        "dotfiles=${config.dotfiles.dir}"
      ];
      # binaryCaches = [ "https://nix-community.cachix.org" ];
      # binaryCachePublicKeys = [
      #   "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
      # ];
      registry = registryInputs // { dotfiles.flake = inputs.self; };
      settings.auto-optimise-store = true;
    };
  system.configurationRevision = with inputs; mkIf (self ? rev) self.rev;

  ## Some reasonable, global defaults
  # This is here to appease 'nix flake check' for generic hosts with no
  # hardware-configuration.nix or fileSystem config.
  # fileSystems."/".device = mkDefault "/dev/disk/by-label/nixos";

  # Use the latest kernel
  # boot = {
  #   kernelPackages = mkDefault pkgs.linuxPackages_5_10;
  #   loader = {
  #     efi.canTouchEfiVariables = mkDefault true;
  #     systemd-boot.configurationLimit = 10;
  #     systemd-boot.enable = mkDefault true;
  #   };
  # };

  # Just the bear necessities...
  # environment.systemPackages = with pkgs; [
  #   bind
  #   cached-nix-shell
  #   coreutils
  #   git
  #   vim
  #   wget
  #   gnumake
  #   unzip
  # ];
}