new package: py-tensorboard-plugin-wit (#15898)

* new package: py-tensorboard-plugin-wit

dependency for py-tensorboard >= 2.2.0

* incorporate feedback

var/spack/repos/builtin/packages/py-tensorboard-plugin-wit/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 PyTensorboardPluginWit(Package):
+    """The What-If Tool makes it easy to efficiently and
+       intuitively explore up to two models' performance
+       on a dataset. Investigate model performances for
+       a range of features in your dataset, optimization
+       strategies and even manipulations to individual
+       datapoint values. All this and more, in a visual way
+       that requires minimal code."""
+
+    homepage = "https://pypi.python.org/project/tensorboard-plugin-wit"
+    git      = "https://github.com/pair-code/what-if-tool.git"
+
+    version('master', branch='master')
+    depends_on('bazel@0.26.1:', type='build')
+    depends_on('py-setuptools@36.2.0:', type='build')
+    depends_on('python@2.7:2.8,3.2:', type=('build', 'run'))
+    depends_on('py-wheel', type='build')
+
+    extends('python')
+
+    phases = ['setup', 'build', 'install']
+
+    def setup_build_environment(self, env):
+        tmp_path = '/tmp/spack/tb-plugin'
+        mkdirp(tmp_path)
+        env.set('TEST_TMPDIR', tmp_path)
+
+    def setup(self, spec, prefix):
+        builddir = join_path(self.stage.source_path, 'spack-build')
+        mkdirp(builddir)
+        filter_file(r'dest=.*',
+                    'dest="{0}"'.format(builddir),
+                    'tensorboard_plugin_wit/pip_package/build_pip_package.sh')
+        filter_file(r'pip install .*',
+                    ''.format(builddir),
+                    'tensorboard_plugin_wit/pip_package/build_pip_package.sh')
+        filter_file(r'command \-v .*',
+                    ''.format(builddir),
+                    'tensorboard_plugin_wit/pip_package/build_pip_package.sh')
+        filter_file(r'virtualenv venv',
+                    ''.format(builddir),
+                    'tensorboard_plugin_wit/pip_package/build_pip_package.sh')
+
+    def build(self, spec, prefix):
+        tmp_path = env['TEST_TMPDIR']
+        bazel('--nohome_rc',
+              '--nosystem_rc',
+              '--output_user_root=' + tmp_path,
+              'run',
+              '--verbose_failures',
+              '--subcommands=pretty_print',
+              'tensorboard_plugin_wit/pip_package:build_pip_package')
+
+    def install(self, spec, prefix):
+        with working_dir('spack-build/release'):
+            setup_py('install', '--prefix={0}'.format(prefix),
+                     '--single-version-externally-managed', '--root=/')