pythonPackages.wheel: move expression to separate file

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

@@ -0,0 +1,32 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytest
+, pytestcov
+, coverage
+, jsonschema
+}:
+
+buildPythonPackage rec {
+  pname = "wheel";
+  version = "0.29.0";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1ebb8ad7e26b448e9caa4773d2357849bf80ff9e313964bcaf79cbf0201a1648";
+  };
+
+  buildInputs = [ pytest pytestcov coverage ];
+
+  propagatedBuildInputs = [ jsonschema ];
+
+  # We add this flag to ignore the copy installed by bootstrapped-pip
+  installFlags = [ "--ignore-installed" ];
+
+  meta = {
+    description = "A built-package format for Python";
+    license = with lib.licenses; [ mit ];
+    homepage = https://bitbucket.org/pypa/wheel/;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -25922,28 +25922,7 @@ EOF
     };
   };
 
-  wheel = buildPythonPackage rec {
+  wheel = callPackage ../development/python-modules/wheel { };
-    name = "wheel-${version}";
-    version = "0.29.0";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/w/wheel/${name}.tar.gz";
-      sha256 = "1ebb8ad7e26b448e9caa4773d2357849bf80ff9e313964bcaf79cbf0201a1648";
-    };
-
-    buildInputs = with self; [ pytest pytestcov coverage ];
-
-    propagatedBuildInputs = with self; [ jsonschema ];
-
-    # We add this flag to ignore the copy installed by bootstrapped-pip
-    installFlags = [ "--ignore-installed" ];
-
-    meta = {
-      description = "A built-package format for Python";
-      license = with licenses; [ mit ];
-      homepage = https://bitbucket.org/pypa/wheel/;
-    };
-  };
 
   widgetsnbextension = callPackage ../development/python-modules/widgetsnbextension { };