Initial commit

flake/den/modules/aspects/provides/define-user.nix

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+{ lib, den, ... }:
+let
+  description = ''
+    Defines a user at OS and Home levels.
+
+    Works in NixOS/Darwin and standalone Home-Manager
+
+    ## Usage
+
+       # for NixOS/Darwin
+       den.aspects.my-user.includes = [ den._.define-user ]
+
+       # for standalone home-manager
+       den.aspects.my-home.includes = [ den._.define-user ]
+
+    or globally (automatically applied depending on context):
+
+       den.default.includes = [ den._.define-user ]
+  '';
+
+  homeDir =
+    host: user:
+    if lib.hasSuffix "darwin" host.system then "/Users/${user.userName}" else "/home/${user.userName}";
+
+  userContext =
+    { host, user, ... }:
+    {
+      nixos.users.users.${user.userName}.isNormalUser = true;
+      darwin.users.users.${user.userName} = {
+        name = user.userName;
+        home = homeDir host user;
+      };
+      homeManager = {
+        home.username = user.userName;
+        home.homeDirectory = homeDir host user;
+      };
+    };
+
+  hmContext =
+    { home, ... }:
+    userContext {
+      host.system = home.system;
+      user.userName = home.userName;
+    };
+in
+{
+  den.provides.define-user = {
+    inherit description;
+    includes = [
+      userContext
+      hmContext
+    ];
+    __functor = den.lib.parametric.atLeast;
+  };
+}