refactor(dotfiles): separate registry validation

src/dotfiles/registry.nix

@@ -19,14 +19,12 @@ let
       ];
     }).config;
 
-  data = validate (
-    lib.mapAttrs (
-      registryName: _registry:
-      lib.mapAttrs (hostName: host: host.config.registry.${registryName}.${hostName} or { }) hosts
-    ) definitions
-  );
-
   validate = import ./registry/validation.nix { inherit definitions lib; };
+
+  data = lib.mapAttrs (
+    registryName: _registry:
+    lib.mapAttrs (hostName: host: host.config.registry.${registryName}.${hostName} or { }) hosts
+  ) definitions;
 in
 {
   types = lib.mapAttrs (_name: definition: definition.type) definitions;
@@ -45,13 +43,16 @@ in
     ) definitions;
   };
 
-  collected = data // {
+  collected =
-    join =
+    assert validate data;
-      host: entry:
+    data
-      lib.filterAttrs (_name: value: value != null) (
+    // {
-        lib.mapAttrs (
+      join =
-          registryName: _registry: (data.${registryName}.${host} or { }).${entry} or null
+        host: entry:
-        ) definitions
+        lib.filterAttrs (_name: value: value != null) (
-      );
+          lib.mapAttrs (
-  };
+            registryName: _registry: (data.${registryName}.${host} or { }).${entry} or null
+          ) definitions
+        );
+    };
 }

src/dotfiles/registry/validation.nix

@@ -35,7 +35,6 @@ let
   assertions = validationAssertions data;
   failures = lib.filter (assertion: !assertion.assertion) assertions;
 in
-assert lib.assertMsg (lib.all (assertion: assertion.assertion) assertions) (
+lib.assertMsg (lib.all (assertion: assertion.assertion) assertions) (
   lib.concatMapStringsSep "\n" (assertion: assertion.message) failures
-);
+)
-data