Update NOTES.md

NOTES.md

@@ -1,9 +1,44 @@
 # ToDo's
 
-- find a good abstraction for systems that allows setting nixpkgs.localSystem per systems
+- https://nixos.wiki/wiki/Binary_Cache
-  - e.g. build utility function with a module based interface to set things like march and hostname
+- build a good abstraction for systems 
+  - allows setting nixpkgs.localSystem per systems
   - should yield a `nixosConfiguration.${hostname} = nixpkgs.lib.nixosSystem {...}`
-- set localSystem per system like this:
+  - example module abstraction
+    ```nix
+    # TODO think about partitions/hardware/system specific conf
+    # TODO think about hardware.nix like things
+    { config,
+      inputs,
+      lib,
+      ...
+    }: {
+      home_conf = {
+        # ...
+      };
+      os_conf = {
+        # ...
+      };
+    }
+  - example mkSystem abstraction
+    ```nix
+    let opts = {
+      hostname = "test";
+      opt = "znver2";
+      users = {
+        { name = "tristand", groups=[..] },
+        { name = "tester", groups=[..] },
+      };
+      modules = [
+        ./my_module.nix
+      ];
+    };
+    in {
+      mylib.mkSystem opts?            #
+      # take a path? just let the user call import ?
+    }
+    ```
+  - example localSystem conf
     ```nix
     # to allow building
     nix.extraOptions = ''