pythonPackages.pytest-raisesregexp: Move to own file

pkgs/development/python-modules/pytest-raisesregexp/default.nix

@@ -0,0 +1,26 @@
+{ stdenv, buildPythonPackage, fetchPypi
+, py, pytest }:
+
+buildPythonPackage rec {
+  pname = "pytest-raisesregexp";
+  version = "2.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0q8yby4g3il86rp7rhk89792wm17cykzsqcwbxpbbyal3an8mphg";
+  };
+
+  buildInputs = [ py pytest ];
+
+  # https://github.com/kissgyorgy/pytest-raisesregexp/pull/3
+  prePatch = ''
+    sed -i '3i\import io' setup.py
+    substituteInPlace setup.py --replace "long_description=open('README.rst').read()," "long_description=io.open('README.rst', encoding='utf-8').read(),"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Simple pytest plugin to look for regex in Exceptions";
+    homepage = https://github.com/Walkman/pytest_raisesregexp;
+    license = with licenses; [ mit ];
+  };
+}