Initial commit

flake/den/modules/aspects/provides/home-manager.nix

@@ -0,0 +1,76 @@
+{
+  inputs,
+  lib,
+  den,
+  ...
+}:
+let
+  description = ''
+    integrates home-manager into nixos/darwin OS classes.
+
+    usage:
+
+      for using home-manager in just a particular host:
+
+        den.aspects.my-laptop.includes = [ den._.home-manager ];
+
+      for enabling home-manager by default on all hosts:
+
+        den.default.includes = [ den._.home-manager ];
+
+    Does nothing for hosts that have no users with `homeManager` class.
+    Expects `inputs.home-manager` to exist. If `<host>.hm-module` exists
+    it is the home-manager.{nixos/darwin}Modules.home-manager.
+
+    For each user resolves den.aspects.''${user.aspect} and imports its homeManager class module.
+  '';
+
+  homeManager =
+    { OS, host }:
+    { class, aspect-chain }:
+    let
+      hmClass = "homeManager";
+      hmUsers = builtins.filter (u: u.class == hmClass) (lib.attrValues host.users);
+
+      hmUserModule =
+        user:
+        let
+          ctx = {
+            inherit aspect-chain;
+            class = hmClass;
+          };
+          HM = den.aspects.${user.aspect};
+          aspect = HM {
+            inherit host user;
+            OS-HM = { inherit OS HM; };
+          };
+          module = aspect.resolve ctx;
+        in
+        module;
+
+      users = map (user: {
+        name = user.userName;
+        value.imports = [ (hmUserModule user) ];
+      }) hmUsers;
+
+      hmModule = host.hm-module or inputs.home-manager."${class}Modules".home-manager;
+      aspect.${class} = {
+        imports = [ hmModule ];
+        home-manager.users = lib.listToAttrs users;
+      };
+
+      supportedOS = builtins.elem class [
+        "nixos"
+        "darwin"
+      ];
+      enabled = supportedOS && builtins.length hmUsers > 0;
+    in
+    if enabled then aspect else { };
+
+in
+{
+  den.provides.home-manager = {
+    inherit description;
+    __functor = _: den.lib.take.exactly homeManager;
+  };
+}