flake.nix

{
  description = "Darwin system flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    nix-darwin.url = "github:LnL7/nix-darwin";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = inputs@{ self, nix-darwin, nixpkgs }:
  let
    configuration = { pkgs, ... }: {
      # List packages installed in system profile. To search by name, run:
      # $ nix-env -qaP | grep wget
      environment.systemPackages = [
        pkgs.vim
      ];

      # Auto upgrade nix package and the daemon service.
      services.nix-daemon.enable = true;
      nix.package = pkgs.nixVersions.latest;

      # Necessary for using flakes on this system.
      nix.settings.experimental-features = "nix-command flakes";
      nix.settings.trusted-users = [ "@admin" ];
      
      # Set up Linux builder
      nix.linux-builder = {
        enable = true;
        ephemeral = true;
        maxJobs = 4;
        config = {
          virtualisation = {
            darwin-builder = {
              diskSize = 40 * 1024;
              memorySize = 8 * 1024;
            };
            cores = 6;
          };
        };
      };

      # Create /etc/zshrc that loads the nix-darwin environment.
      programs.zsh.enable = true;  # default shell on catalina
      # programs.fish.enable = true;

      # Set Git commit hash for darwin-version.
      system.configurationRevision = self.rev or self.dirtyRev or null;

      # Used for backwards compatibility, please read the changelog before changing.
      # $ darwin-rebuild changelog
      system.stateVersion = 4;

      # The platform the configuration will be used on.
      nixpkgs.hostPlatform = "aarch64-darwin";
    };
  in
  {
    # Build darwin flake using:
    # $ darwin-rebuild build --flake .#macbookpro
    darwinConfigurations."macbookpro" = nix-darwin.lib.darwinSystem {
      modules = [ configuration ];
    };

    # Expose the package set, including overlays, for convenience.
    darwinPackages = self.darwinConfigurations."macbookpro".pkgs;
  };
}