home-manager: home-manager as a flake

.config/home-manager/common.nix

@@ -1,13 +1,9 @@
 { config, lib, pkgs, ... }:
 
 {
-  imports = [ ./platform.nix ];
-
-  home.stateVersion = "24.05";
   programs.home-manager.enable = true;
 
   home = {
-    username = "pratham";
     packages = with pkgs; [
       gawk
       gnugrep

.config/home-manager/darwin.nix

@@ -1,7 +1,11 @@
 { config, lib, pkgs, ... }:
+let
+  me = "pratham";
+in
 
 {
-  home.homeDirectory = "/Users/pratham";
+  home.username = "${me}";
+  home.homeDirectory = "/Users/${me}";
 
   targets.darwin = {
     currentHostDefaults = {

.config/home-manager/hm.flake.nix

@@ -0,0 +1,33 @@
+{
+  inputs = {
+    # a better way of using the latest stable version of nixpkgs
+    # without specifying specific release
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
+    home-manager.url = "github:nix-community/home-manager/release-23.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, home-manager, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
+      in
+      {
+        packages.homeConfigurations = {
+          "pratham" = home-manager.lib.homeManagerConfiguration {
+            inherit pkgs;
+            modules = [
+              ./home.nix
+              (if pkgs.stdenv.isLinux then ./linux.nix else ./darwin.nix)
+              {
+                home.stateVersion = "23.11";
+              }
+            ];
+          };
+        };
+      }
+    );
+}

.config/home-manager/linux.nix

@@ -1,6 +1,10 @@
 { config, lib, pkgs, ... }:
+let
+  me = "pratham";
+in
 
 {
-  home.homeDirectory = "/home/pratham";
+  home.username = "${me}";
+  home.homeDirectory = "/home/${me}";
   targets.genericLinux.enable = true;
 }