{ pkgs, lib, ... }:
{
  environment.systemPackages = with pkgs; [
    (writeShellScriptBin "nix-referrers" "nix-store --query --referrers $@")
    (writeShellScriptBin "nixpkgs-review-head" "nixpkgs-review rev HEAD")
    (writeShellScriptBin "rebuild" "bash -c \"nixos-rebuild switch |& nom\"")

    nixpkgs-review
    nixfmt-rfc-style
    nixd
    nixpkgs-hammering
    nix-output-monitor
    nix-search-cli
    niv
    vulnix
  ];

  environment.sessionVariables = lib.mkIf pkgs.config.allowUnfree { NIXPKGS_ALLOW_UNFREE = "1"; };

  grimmShared.tooling.nvim = {
    plugins = with pkgs.vimPlugins; [ vim-nix ];
  };

  grimmShared.tooling.lang_servers = [
    {
      lsp.package = pkgs.nixd;
      fmt = {
        package = pkgs.nixpkgs-fmt;
        includes = [ "*.nix" ];
      };
    }
  ];

  nix.settings = {
    experimental-features = [
      "nix-command"
      "flakes"
    ];
    warn-dirty = false;
  };
  nix.gc = {
    automatic = true;
    dates = "weekly";
    options = "--delete-older-than 30d";
  };

  # nix.package = pkgs.nixVersions.latest;
  nix.optimise.automatic = true;
}