modules/nix.nix


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{ inputs, config, lib, ... }:
{
    options.teh-nix.nix = with lib; {
        enable = mkEnableOption "Use the TehNix nix settings";
    };

    config = lib.mkIf config.teh-nix.nix.enable {
        nix.nixPath = [ "/etc/nix/path" ];
        nix.registry.nixpkgs.flake = inputs.nixpkgs;
        environment.etc."nix/path/nixpkgs".source = inputs.nixpkgs;
        
        nix = {
            settings = {
                experimental-features = [ "nix-command" "flakes" ];
                auto-optimise-store = true;
                
                trusted-users = [ "boss" ];

                substituters = [
                    "https://cache.nixos.org"
                ];

                # trusted-public-keys = [
                #     "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
                # ];
            };
            optimise.automatic = true;
        };

        # nh's cleaner replaces nix.gc (the nh module asserts they aren't both on)
        programs.nh = {
            enable = true;
            clean = {
                enable = true;
                dates = "weekly";
                # --no-direnv keeps nix-direnv's gcroots so dev shells survive
                extraArgs = "--keep-since 7d --keep 5 --no-direnv";
            };
        };
    };
}