mkDarwinSystem.nix

inputs:

{
  username,
  fullName,
  email,
  nixConfigDirectory, # directory on the system where this flake is located
  system ? "aarch64-darwin",

  # `nix-darwin` modules to include
  modules ? [ ],
  # Additional `nix-darwin` modules to include, useful when reusing a configuration with
  # `lib.makeOverridable`.
  extraModules ? [ ],

  # Value for `home-manager`'s `home.stateVersion` option.
  homeStateVersion,
  # `home-manager` modules to include
  homeModules ? [ ],
  # Additional `home-manager` modules to include, useful when reusing a configuration with
  # `lib.makeOverridable`.
  extraHomeModules ? [ ],
}:

inputs.darwin.lib.darwinSystem {
  inherit system;
  modules =
    modules
    ++ extraModules
    ++ [
      inputs.home-manager.darwinModules.home-manager
      (
        { config, ... }:
        {
          users.primaryUser = {
            inherit
              username
              fullName
              email
              nixConfigDirectory
              ;
          };

          # Support legacy workflows that use `<nixpkgs>` etc.
          nix.nixPath.nixpkgs = "${inputs.nixpkgs-unstable}";

          # `home-manager` config
          users.users.${username}.home = "/Users/${username}";
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.${username} = {
            imports = homeModules ++ extraHomeModules;
            home.stateVersion = homeStateVersion;
            home.user-info = config.users.primaryUser;
          };
        }
      )
    ];
}