refactor(nix): Use home-manager

Looks like nix-darwin is planning to drop per-user launchd (or perhaps
per-user feature entirely).

.config/nix/darwin/configuration.nix

@@ -49,16 +49,25 @@
   # Set Git commit hash for darwin-version.
   system.configurationRevision = vars.rev or null;
 
-  # Used for backwards compatibility, please read the changelog before changing.
-  # $ darwin-rebuild changelog
-  system.stateVersion = 4;
-
   # The platform the configuration will be used on.
   nixpkgs.hostPlatform = vars.arch;
 
+  # Used for backwards compatibility, please read the changelog before changing.
+  # $ darwin-rebuild changelog
+  system = {
+    stateVersion = 4;
+  };
+
+  users.users.ziro = {
+    name = "ziro";
+    home = "/Users/ziro";
+  };
+  home-manager.users.ziro = {
+    home.stateVersion = "22.05";
     # Swap CapsLock with Esc for better vi-mode experience.
-  launchd.user.agents.CapsEscSwap = {
+    launchd.agents.CapsEscSwap = {
-    serviceConfig = {
+      enable = true;
+      config = {
         ProgramArguments = [
           "/usr/bin/hidutil"
           "property"
@@ -68,5 +77,6 @@
         RunAtLoad = true;
       };
     };
+  };
 }
 # vim:set ts=2 sw=2 et:

.config/nix/darwin/default.nix

@@ -1,4 +1,4 @@
-{ inputs, nixpkgs, nix-darwin, vars, ... }:
+{ inputs, nixpkgs, nix-darwin, home-manager, vars, ... }:
 
 let
   systemConfig = system: {
@@ -23,8 +23,15 @@ in
     in
     nix-darwin.lib.darwinSystem {
       inherit system;
-      specialArgs = { inherit inputs pkgs vars; };
+      specialArgs = { inherit inputs pkgs home-manager vars; };
-      modules = [ ./configuration.nix ];
+      modules = [
+        ./configuration.nix
+        home-manager.darwinModules.home-manager
+        {
+          home-manager.useGlobalPkgs = true;
+          home-manager.useUserPackages = true;
+        }
+      ];
     };
 
   # Imaginary M1, just for reference
@@ -35,8 +42,15 @@ in
     in
     nix-darwin.lib.darwinSystem {
       inherit system;
-      specialArgs = { inherit inputs pkgs vars; };
+      specialArgs = { inherit inputs pkgs home-manager vars; };
-      modules = [ ./configuration.nix ];
+      modules = [
+        ./configuration.nix
+        home-manager.darwinModules.home-manager
+        {
+          home-manager.useGlobalPkgs = true;
+          home-manager.useUserPackages = true;
+        }
+      ];
     };
 }
 # vim:set ts=2 sw=2 et:

.config/nix/flake.lock

@@ -1,5 +1,26 @@
 {
   "nodes": {
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1720042825,
+        "narHash": "sha256-A0vrUB6x82/jvf17qPCpxaM+ulJnD8YZwH9Ci0BsAzE=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "e1391fb22e18a36f57e6999c7a9f966dc80ac073",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "release-24.05",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
     "nix-darwin": {
       "inputs": {
         "nixpkgs": [
@@ -38,6 +59,7 @@
     },
     "root": {
       "inputs": {
+        "home-manager": "home-manager",
         "nix-darwin": "nix-darwin",
         "nixpkgs": "nixpkgs"
       }

.config/nix/flake.nix

@@ -3,11 +3,17 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-24.05-darwin";
-    nix-darwin.url = "github:LnL7/nix-darwin";
+    nix-darwin = {
-    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
+      url = "github:LnL7/nix-darwin";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    home-manager = {
+      url = "github:nix-community/home-manager/release-24.05";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = inputs@{ self, nix-darwin, nixpkgs }:
+  outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager }:
   let
     vars = {
       rev = self.rev or self.dirtyRev or null;
@@ -17,7 +23,7 @@
     darwinConfigurations = (
       import ./darwin {
         inherit (nixpkgs) lib;
-        inherit inputs nixpkgs nix-darwin vars;
+        inherit inputs nixpkgs nix-darwin home-manager vars;
       }
     );
   };