feat(nix): pass flake self to darwin modules and add revision

flake.nix

@@ -1,11 +1,14 @@
 {
   outputs =
-    inputs:
+    { self, ... }@inputs:
     inputs.flake-parts.lib.mkFlake { inherit inputs; } (
       (inputs.import-tree ./nix)
       // {
         systems = import inputs.systems;
-        flake.paths.root = ./.;
+        flake = {
+          inherit self;
+          paths.root = ./.;
+        };
       }
     );
   inputs = {

nix/configurations.nix

@@ -38,6 +38,7 @@ let
         }
       else if class == "darwin" then
         darwinSystem {
+          specialArgs = { inherit (config.flake) self; };
           modules = [ cfg.modules.darwin.default ];
         }
       else

nix/meta.nix

@@ -56,6 +56,7 @@ let
 in
 {
   options.flake = mkSubmoduleOptions {
+    self = mkOption { type = raw; };
     lib = mkOption {
       type = lazyAttrsOf raw;
       default = { };

nix/modules/cli/nix.nix

@@ -3,4 +3,11 @@
     "nix-command"
     "flakes"
   ];
+  flake.modules.darwin.default = {
+    nix.enable = false;
+    nix.settings.experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+  };
 }

nix/modules/system/system.nix

@@ -12,6 +12,11 @@
       {
         home.stateVersion = osConfig.system.stateVersion;
       };
-    darwin.default.system.stateVersion = 6;
+    darwin.default =
+      { self, ... }:
+      {
+        system.configurationRevision = self.rev or self.dirtyRev or null;
+        system.stateVersion = 6;
+      };
   };
 }