refactor: mkHost load-all infrastructure and convert simple features

features/direnv/default.nix

@@ -1,26 +1,40 @@
 {
   nixos =
-    { inputs, ... }:
+    { config, lib, inputs, ... }:
+    let
+      cfg = config.features.direnv;
+    in
     {
-      nix.registry.dev = {
-        from = {
-          type = "indirect";
-          id = "dev";
-        };
-        to = {
-          type = "path";
-          path = inputs.self.outPath;
+      options.features.direnv.enable = lib.mkEnableOption "direnv";
+
+      config = lib.mkIf cfg.enable {
+        nix.registry.dev = {
+          from = {
+            type = "indirect";
+            id = "dev";
+          };
+          to = {
+            type = "path";
+            path = inputs.self.outPath;
+          };
         };
       };
     };
 
-  home = _: {
-    programs.direnv = {
-      enable = true;
-      nix-direnv.enable = true;
-      config.global.hide_env_diff = true;
-    };
+  home =
+    { lib, osConfig, ... }:
+    let
+      cfg = osConfig.features.direnv;
+    in
+    {
+      config = lib.mkIf cfg.enable {
+        programs.direnv = {
+          enable = true;
+          nix-direnv.enable = true;
+          config.global.hide_env_diff = true;
+        };
 
-    xdg.configFile."direnv/lib/use_dev.sh".source = ./use_dev.sh;
-  };
+        xdg.configFile."direnv/lib/use_dev.sh".source = ./use_dev.sh;
+      };
+    };
 }