{
  description = "Arnie's nix flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    devshell = {
      url = "github:numtide/devshell";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, devshell }:
    let
      systems = nixpkgs.lib.genAttrs [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
    in
    {
      lib = {
        forAllSystems = function: systems (system:
          function (import nixpkgs {
            inherit system;
            overlays = [
              devshell.overlays.default
            ];
            config.allowUnfreePredicate = (pkg: builtins.elem (nixpkgs.lib.getName pkg) [ "terraform" ]);
          })
        );

        golangci-config-file = ./.golangci.yml;

        cd_root = "cd $PRJ_ROOT;";

        control4_env = self.lib.forAllSystems (pkgs: ([pkgs.lua5_1]));
      };

      formatter = self.lib.forAllSystems (pkgs: pkgs.nixpkgs-fmt);

      devShells = self.lib.forAllSystems (pkgs: {
        default = pkgs.devshell.mkShell {
          name = "nix";

          packages = [
            pkgs.nix-tree
            pkgs.golangci-lint
          ];

          commands = [
            {
              name = "fix";
              command = ''
                ${self.lib.cd_root}
                nix fmt .
              '';
            }
          ];
        };
      });
    };
}