modules: refactor plugins code in top-level

modules/top-level/plugins/utils.nix

@@ -0,0 +1,38 @@
+lib:
+lib.fix (self: {
+  normalizedPluginType = lib.types.submodule {
+    options = {
+      plugin = lib.mkOption {
+        type = lib.types.package;
+      };
+
+      config = lib.mkOption {
+        type = with lib.types; nullOr str;
+      };
+
+      optional = lib.mkOption {
+        type = lib.types.bool;
+      };
+    };
+  };
+
+  # Normalize a plugin in a standard { plugin, config, optional } attrs
+  normalizePlugin =
+    p:
+    let
+      defaultPlugin = {
+        plugin = null;
+        config = null;
+        optional = false;
+      };
+    in
+    defaultPlugin // (if p ? plugin then p else { plugin = p; });
+
+  # Normalize a list of plugins
+  normalizePlugins = builtins.map self.normalizePlugin;
+
+  getAndNormalizeDeps = p: self.normalizePlugins (p.plugin.dependencies or [ ]);
+
+  # Remove dependencies from all plugins in a list
+  removeDeps = map (p: p // { plugin = removeAttrs p.plugin [ "dependencies" ]; });
+})