pythonPackages.pygments: move expression to own file

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

@@ -0,0 +1,28 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, docutils
+}:
+
+buildPythonPackage rec {
+  pname = "Pygments";
+  version = "2.2.0";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1k78qdvir1yb1c634nkv6rbga8wv4289xarghmsbbvzhvr311bnv";
+  };
+
+  propagatedBuildInputs = [ docutils ];
+
+  # Circular dependency with sphinx
+  doCheck = false;
+
+  meta = {
+    homepage = http://pygments.org/;
+    description = "A generic syntax highlighter";
+    license = lib.licenses.bsd2;
+    maintainers = with lib.maintainers; [ nckx garbas ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -19902,30 +19902,10 @@ in {
     };
   };
 
-  pygments = buildPythonPackage rec {
+  pygments = callPackage ../development/python-modules/Pygments { };
-    version = "2.2.0";
-    name = "Pygments-${version}";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/P/Pygments/${name}.tar.gz";
-      sha256 = "1k78qdvir1yb1c634nkv6rbga8wv4289xarghmsbbvzhvr311bnv";
-    };
-
-    propagatedBuildInputs = with self; [ docutils ];
-
-    # Circular dependency with sphinx
-    doCheck = false;
-
-    meta = {
-      homepage = http://pygments.org/;
-      description = "A generic syntax highlighter";
-      license = licenses.bsd2;
-      maintainers = with maintainers; [ nckx garbas ];
-    };
-  };
 
   # For Pelican 3.6.3
-  pygments_2_0 = self.pygments.override rec {
+  pygments_2_0 = self.pygments.overrideAttrs( oldAttrs: rec {
     version = "2.0.2";
     name = "Pygments-${version}";
 
@@ -19933,7 +19913,7 @@ in {
       url = "mirror://pypi/P/Pygments/${name}.tar.gz";
       sha256 = "7320919084e6dac8f4540638a46447a3bd730fca172afc17d2c03eed22cf4f51";
     };
-  };
+  });
 
   pygpgme = buildPythonPackage rec {
     version = "0.3";