nix: autoupdate module

nix/homeModules/named/carbon/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
 let
   inherit (pkgs) myPkgs;
@@ -48,4 +48,31 @@ in
 
   i18n.inputMethod.enabled = "fcitx5";
 
+  services.autoupdate = {
+    enable = true;
+    settings =
+      let
+        updateInputs = lib.concatMapStrings (input: ''
+          ${lib.getExe pkgs.nix} flake update ${input}
+        '');
+      in
+      {
+        "dotfiles" = {
+          path = "/home/leana/.dotfiles";
+          updateCommand = ''
+            ${updateInputs [
+              "nixpkgs"
+              "home-manager"
+              "nur"
+              "flake-parts"
+              "pre-commit-hooks"
+              "deploy-rs"
+            ]}
+
+            ${lib.getExe pkgs.nix} build ".#nixosConfigurations.carbon.config.system.build.toplevel"
+          '';
+          commitMessageCommand = ''${lib.getExe pkgs.nvd} diff "/nix/var/nix/profiles/system" result'';
+        };
+      };
+  };
 }