pythonPackages.xlib: refactor move to python-modules

pkgs/development/python-modules/xlib/default.nix

···
+{ stdenv
+, buildPythonPackage
+, fetchFromGitHub
+, six
+, setuptools_scm
+, pkgs
+}:
+
+buildPythonPackage rec {
+  pname = "xlib";
+  version = "0.17";
+
+  src = fetchFromGitHub {
+    owner = "python-xlib";
+    repo = "python-xlib";
+    rev = "${version}";
+    sha256 = "1iiz2nq2hq9x6laavngvfngnmxbgnwh54wdbq6ncx4va7v98liyi";
+  };
+
+  # Tests require `pyutil' so disable them to avoid circular references.
+  doCheck = false;
+
+  propagatedBuildInputs = [ six setuptools_scm pkgs.xorg.libX11 ];
+
+  meta = with stdenv.lib; {
+    description = "Fully functional X client library for Python programs";
+    homepage = http://python-xlib.sourceforge.net/;
+    license = licenses.gpl2Plus;
+  };
+
+}

pkgs/top-level/python-packages.nix

···
 
   xcaplib = callPackage ../development/python-modules/xcaplib { };
 
-  xlib = buildPythonPackage (rec {
-    name = "xlib-${version}";
-    version = "0.17";
-
-    src = pkgs.fetchFromGitHub {
-      owner = "python-xlib";
-      repo = "python-xlib";
-      rev = "${version}";
-      sha256 = "1iiz2nq2hq9x6laavngvfngnmxbgnwh54wdbq6ncx4va7v98liyi";
-    };
-
-    # Tests require `pyutil' so disable them to avoid circular references.
-    doCheck = false;
-
-    propagatedBuildInputs = with self; [ six setuptools_scm pkgs.xorg.libX11 ];
-
-    meta = {
-      description = "Fully functional X client library for Python programs";
-
-      homepage = http://python-xlib.sourceforge.net/;
-
-      license = licenses.gpl2Plus;
-    };
-  });
+  xlib = callPackage ../development/python-modules/xlib { };
 
   xml2rfc = callPackage ../development/python-modules/xml2rfc { };