emacsPackages.urweb: extract from manual-packages.nix

pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix

@@ -237,24 +237,7 @@
     };
   };
 
-  urweb-mode = self.trivialBuild {
-    pname = "urweb-mode";
-
-    inherit (pkgs.urweb) src version;
-
-    packageRequires = [
-      self.cl-lib
-      self.flycheck
-    ];
-
-    postUnpack = "sourceRoot=$sourceRoot/src/elisp";
-
-    meta = {
-      description = "Major mode for editing Ur/Web";
-      inherit (pkgs.urweb.meta) license homepage;
-      maintainers = [ lib.maintainers.sternenseemann ];
-    };
-  };
+  urweb-mode = callPackage ./urweb-mode { };
 
   # Packages made the classical callPackage way
 

pkgs/applications/editors/emacs/elisp-packages/urweb-mode/default.nix

@@ -0,0 +1,27 @@
+{ lib
+, trivialBuild
+, urweb
+, cl-lib
+, flycheck
+}:
+
+trivialBuild {
+  pname = "urweb-mode";
+
+  inherit (urweb) src version;
+
+  packageRequires = [
+    cl-lib
+    flycheck
+  ];
+
+  postUnpack = ''
+    sourceRoot=$sourceRoot/src/elisp
+  '';
+
+  meta = {
+    description = "Major mode for editing Ur/Web";
+    inherit (urweb.meta) license homepage;
+    maintainers = [ lib.maintainers.sternenseemann ];
+  };
+}