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";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };
  outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager }:
  let
    system = "aarch64-darwin";
    configuration = { pkgs, config, ... }: {
      # List packages installed in system profile. To search by name, run:
      # $ nix-env -qaP | grep wget
      environment.systemPackages =
        [
          pkgs.vim
          pkgs.neovim
          pkgs.tmux
          pkgs.tmuxinator
          pkgs.alacritty
          pkgs.mkalias
          pkgs.zsh
        ];
      # MacOS doesn't index symlinks for spotlight.
      # This means that we can't search for GUI applications installed via nix unless we configure it like below
      system.activationScripts.applications.text = let
        env = pkgs.buildEnv {
          name = "system-applications";
          paths = config.environment.systemPackages;
          pathsToLink = "/Applications";
        };
      in
        pkgs.lib.mkForce ''
        # Set up applications.
        echo "setting up /Applications..." >&2
        rm -rf /Applications/Nix\ Apps
        mkdir -p /Applications/Nix\ Apps
        find ${env}/Applications -maxdepth 1 -type l -exec readlink '{}' + |
        while read src; do
          app_name=$(basename "$src")
          echo "copying $src" >&2
          ${pkgs.mkalias}/bin/mkalias "$src" "/Applications/Nix Apps/$app_name"
        done
            '';
      # Auto upgrade nix package and the daemon service.
      services.nix-daemon.enable = true;
      # nix.package = pkgs.nix;
      # Necessary for using flakes on this system.
      nix.settings.experimental-features = "nix-command flakes";
      # 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 = 5;
      # The platform the configuration will be used on.
      nixpkgs.hostPlatform = "aarch64-darwin";

      # Define user to fix HOME directory issue
      users.users.iandias = {
        name = "iandias";
        home = "/Users/iandias";
      };

      # Add home-manager configuration
      home-manager.useGlobalPkgs = true;
      home-manager.useUserPackages = true;
      home-manager.users.iandias = import ./home.nix;
    };
  in
  {
    # Build darwin flake using:
    # $ darwin-rebuild build --flake .#MacBook-Pro-Work
    darwinConfigurations."MacBook-Pro-Work" = nix-darwin.lib.darwinSystem {
      inherit system;
      modules = [
        configuration
        home-manager.darwinModules.home-manager
      ];
    };
    # Expose the package set, including overlays, for convenience.
    darwinPackages = self.darwinConfigurations."MacBook-Pro-Work".pkgs;
  };
}