black-macchiato: init at 1.3.0

Adds the Python package `black-macchiato`, which allows the usage of
`black` for subsets of an entire file.

pkgs/development/python-modules/black-macchiato/default.nix

@@ -0,0 +1,35 @@
+{ stdenv,
+  buildPythonPackage,
+  fetchFromGitHub,
+  pythonOlder,
+  pytestCheckHook,
+  black
+}:
+
+buildPythonPackage rec {
+  pname = "black-macchiato";
+  version = "1.3.0";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner  = "wbolster";
+    repo   = pname;
+    rev    = version;
+    sha256 = "0lc9w50nlbmlzj44krk7kxcia202fhybbnwfh77xixlc7vb4rayl";
+  };
+
+  propagatedBuildInputs = [ black ];
+
+  checkInputs = [ pytestCheckHook black ];
+
+  pythonImportsCheck = [ "black" ];
+
+  meta = with stdenv.lib; {
+    description = "This is a small utility built on top of the black Python code formatter to enable formatting of partial files";
+    homepage    = "https://github.com/wbolster/black-macchiato";
+    license     = licenses.bsd3;
+    maintainers = with maintainers; [ jperras ];
+  };
+
+}