pythonPackages.setuptoolsDarcs: refactor move to python-modules

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

@@ -0,0 +1,30 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, darcsver
+}:
+
+buildPythonPackage rec {
+  pname = "setuptools_darcs";
+  version = "1.2.11";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1wsh0g1fn10msqk87l5jrvzs0yj5mp6q9ld3gghz6zrhl9kqzdn1";
+  };
+
+  # In order to break the dependency on darcs -> ghc, we don't add
+  # darcs as a propagated build input.
+  propagatedBuildInputs = [ darcsver ];
+
+  # ugly hack to specify version that should otherwise come from darcs
+  patchPhase = ''
+    substituteInPlace setup.py --replace "name=PKG" "name=PKG, version='${version}'"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Setuptools plugin for the Darcs version control system";
+    homepage = http://allmydata.org/trac/setuptools_darcs;
+    license = licenses.bsd0;
+  };
+}