flake.nix

{
  description = "Darwin system flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin";
    nix-darwin.url = "github:LnL7/nix-darwin";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
    nix-homebrew.url = "github:zhaofengli-wip/nix-homebrew";
  };

  outputs = inputs@{ self, nix-darwin, nixpkgs, nix-homebrew }:
  let
    configuration = { pkgs, config, ... }: {

      nixpkgs.config.allowUnfree = true;

      # List packages installed in system profile. To search by name, run:
      # $ nix-env -qaP | grep wget
      environment.systemPackages = [
        pkgs.alacritty
        pkgs.btop
        pkgs.git
        pkgs.mkalias
        pkgs.obsidian
        pkgs.podman
        pkgs.ripgrep
        pkgs.rustup
        pkgs.tmux
      ];

      homebrew = {
        enable = true;
        brews = [
          "cmake"
          "conan"
          "mas"
          "neovim"
        ];
        casks = [
          "firefox"
        ];
        masApps = {
          "BitWarden" = 1352778147;
          "TickTick" = 966085870;
          "UTM" = 1538878817;
        };
        onActivation.cleanup = "zap";
        onActivation.autoUpdate = true;
        onActivation.upgrade = true;
      };

      fonts.packages = [
        (pkgs.nerdfonts.override { fonts = [ "JetBrainsMono" ]; })
      ];

      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 ${env}/Applications -maxdepth 1 -type l -exec readlink '{}' + |
        while read -r src; do
          app_name=$(basename "$src")
          echo "copying $src" >&2
          ${pkgs.mkalias}/bin/mkalias "$src" "/Applications/Nix Apps/$app_name"
        done
      '';

      system.defaults = {
        dock.autohide = true;
      };

      # 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";
    };
  in
  {
    # Build darwin flake using:
    # $ darwin-rebuild build --flake .#simple
    darwinConfigurations."zirgas" = nix-darwin.lib.darwinSystem {
      modules = [
        configuration
        nix-homebrew.darwinModules.nix-homebrew {
          nix-homebrew.enable = true;
          nix-homebrew.enableRosetta = true;
          nix-homebrew.user = "tybl";
        }
      ];
    };

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