Initial commit

flake/den/templates/examples/modules/_example/ci/top-level-parametric.nix

@@ -0,0 +1,47 @@
+# it is possible for top-level aspects directly under
+# den.aspects to take a context argument.
+{ den, lib, ... }:
+let
+  # A module to test that toplevel had context.
+  topLevel = name: {
+    config.tops = name;
+    options.tops = lib.mkOption { type = lib.types.str; };
+  };
+in
+{
+
+  den.aspects.toplevel-user =
+    { user, ... }:
+    {
+      nixos.imports = [ (topLevel user.name) ];
+    };
+
+  den.aspects.toplevel-host =
+    { host, ... }:
+    {
+      homeManager.imports = [ (topLevel host.name) ];
+    };
+
+  den.aspects.alice.includes = [
+    den.aspects.toplevel-host
+    den.aspects.toplevel-user
+  ];
+
+  perSystem =
+    {
+      checkCond,
+      alice-at-rockhopper,
+      rockhopper,
+      ...
+    }:
+    {
+      checks.alice-toplevel-user = checkCond "alice toplevel param aspect" (
+        rockhopper.config.tops == "alice"
+      );
+
+      checks.alice-toplevel-host = checkCond "alice toplevel param aspect" (
+        alice-at-rockhopper.tops == "rockhopper"
+      );
+    };
+
+}