refactor: use snowfall

modules/darwin/activation/default.nix

@@ -0,0 +1,8 @@
+{pkgs}: {
+  system.activationScripts.extraActivation = {
+    text = ''
+      set -eo pipefail
+      HOME="/var/root" ${pkgs.lib.getExe pkgs.nvd} --nix-bin-dir=${pkgs.nix}/bin diff /run/current-system "$systemConfig"
+    '';
+  };
+}

modules/darwin/homebrew/default.nix

@@ -0,0 +1,39 @@
+_: {
+  environment.variables = {
+    HOMEBREW_NO_ANALYTICS = "1";
+    HOMEBREW_NO_INSECURE_REDIRECT = "1";
+    HOMEBREW_NO_EMOJI = "1";
+  };
+
+  homebrew = {
+    enable = true;
+    caskArgs.require_sha = true;
+    onActivation = {
+      autoUpdate = true;
+      cleanup = "uninstall";
+      upgrade = true;
+    };
+
+    brews = [
+      "pandoc"
+    ];
+
+    casks = let
+      noQuarantine = name: {
+        inherit name;
+        args = {
+          no_quarantine = true;
+        };
+      };
+    in [
+      "blackhole-16ch"
+      (noQuarantine "eloston-chromium")
+      "sf-symbols"
+      "1password/tap/1password-cli"
+    ];
+
+    taps = [
+      "1password/tap"
+    ];
+  };
+}

modules/darwin/nix/default.nix

@@ -0,0 +1,44 @@
+{
+  pkgs,
+  inputs,
+  config,
+  ...
+}: {
+  services.nix-daemon.enable = true;
+  nix.package = pkgs.nix;
+
+  nix.registry = {
+    n.flake = inputs.nixpkgs;
+  };
+
+  nix.nixPath = [
+    "nixpkgs=${inputs.nixpkgs.outPath}"
+  ];
+
+  nix.settings = {
+    experimental-features = "nix-command flakes";
+    auto-optimise-store = true;
+    extra-platforms = ["x86_64-darwin" "aarch64-darwin"];
+
+    build-users-group = "nixbld";
+    trusted-users = ["ryanccn"];
+    sandbox = true;
+
+    nix-path = config.nix.nixPath;
+  };
+
+  nixpkgs = {
+    overlays = [
+      inputs.fenix.overlays.default
+      inputs.am.overlays.default
+      inputs.nish.overlays.default
+      inputs.nrr.overlays.default
+      inputs.choirpack.overlays.default
+      inputs.nyoom.overlays.default
+      inputs.fh.overlays.default
+    ];
+
+    config.allowUnfree = true;
+    hostPlatform = "aarch64-darwin";
+  };
+}