py-black: add new package

var/spack/repos/builtin/packages/py-black/package.py

@@ -0,0 +1,29 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyBlack(PythonPackage):
+    """Black is the uncompromising Python code formatter. By using it, you agree to
+    cede control over minutiae of hand-formatting. In return, Black gives you
+    speed, determinism, and freedom from pycodestyle nagging about formatting.
+    """
+
+    homepage = "https://github.com/ambv/black"
+    url      = "https://pypi.io/packages/source/b/black/black-18.9b0.tar.gz"
+
+    version('18.9b0', sha256='e030a9a28f542debc08acceb273f228ac422798e5215ba2a791a6ddeaaca22a5')
+
+    depends_on('python@3.6.0:')
+    # Needs setuptools at runtime so that `import pkg_resources` succeeds
+    # See #8843 and #8689 for examples of setuptools added as a runtime dep
+    depends_on('py-setuptools', type=('build', 'run'))
+    # Translated from black's setup.py:
+    # https://github.com/ambv/black/blob/master/setup.py
+    depends_on('py-attrs@18.1.0:', type=('build', 'run'))
+    depends_on('py-click@6.5:', type=('build', 'run'))
+    depends_on('py-appdirs', type=('build', 'run'))
+    depends_on('py-toml@0.9.4:', type=('build', 'run'))