nix: move all darwin configuration to darwinModules

nix/darwinModules/default.nix

@@ -1,5 +1,7 @@
-{
-  flake.darwinModules.commonModules =
+{ lib, modulesFromDir, ... }:
+
+let
+  commonModules =
     { pkgs, hostname, ... }:
     {
       services.nix-daemon.enable = true;
@@ -23,4 +25,17 @@
       # https://github.com/nix-community/home-manager/issues/4026
       users.users."leana".home = "/Users/leana";
     };
+
+  # per host configuration
+  named = lib.mapAttrs' (name: value: {
+    name = "named-" + name;
+    inherit value;
+  }) (modulesFromDir ./named);
+in
+
+{
+  flake.darwinModules = lib.mergeAttrsList [
+    { inherit commonModules; }
+    named
+  ];
 }

nix/darwinModules/named/bismuth/default.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = [
+    pkgs.vim
+    pkgs.gnumake
+    pkgs.gnused
+    pkgs.cachix
+  ];
+}