py-pyface: add new package (#15743)

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

+# Copyright 2013-2020 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)
+
+
+class PyPyface(PythonPackage):
+    """The pyface project contains a toolkit-independent GUI abstraction layer,
+    which is used to support the "visualization" features of the Traits
+    package. Thus, you can write code in terms of the Traits API (views, items,
+    editors, etc.), and let pyface and your selected toolkit and back-end take
+    care of the details of displaying them."""
+
+    homepage = "https://docs.enthought.com/pyface"
+    url      = "https://pypi.io/packages/source/p/pyface/pyface-6.1.2.tar.gz"
+
+    version('6.1.2', sha256='7c2ac3d5cbec85e8504b3b0b63e9307be12c6d710b46bae372ce6562d41f4fbc')
+
+    variant('backend', default='pyqt5', description='Default backend',
+            values=('wx', 'pyqt', 'pyqt5', 'pyside'), multi=False)
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-traits', type=('build', 'run'))
+
+    # Backends
+    depends_on('py-wxpython@2.8.10:', when='backend=wx', type=('build', 'run'))
+    depends_on('py-numpy', when='backend=wx', type=('build', 'run'))
+    depends_on('py-pyqt4@4.10:', when='backend=pyqt', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyqt', type=('build', 'run'))
+    depends_on('py-pyqt5@5:', when='backend=pyqt5', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyqt5', type=('build', 'run'))
+    depends_on('py-pyside@1.2:', when='backend=pyside', type=('build', 'run'))
+    depends_on('py-pygments', when='backend=pyside', type=('build', 'run'))