Add synth.py for automating client library generation

synth.py

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+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This script is used to synthesize generated parts of this library."""
+
+from synthtool import _tracked_paths
+import synthtool as s
+import synthtool.log as log
+import synthtool.shell as shell
+import synthtool.sources.git as git
+import logging
+
+logging.basicConfig(level=logging.DEBUG)
+
+repository_url = "https://github.com/google/google-api-nodejs-client.git"
+
+log.debug(f"Cloning {repository_url}.")
+repository = git.clone(repository_url, depth=1)
+
+log.debug("Installing dependencies.")
+shell.run("npm install".split(), cwd=repository)
+
+log.debug("Generating all libraries.")
+shell.run("make generate".split(), cwd=repository)
+
+# copy src, test, samples directories
+s.copy(repository / "src")
+s.copy(repository / "test")
+s.copy(repository / "samples")