Adds a basic script for generating API docs from the mediapipe Python package

This is pretty bare-bones for now, but I need something to start wiring up the rest of the automation. Plus this should be easy enough for anyone to riff on once it's in place.

I couldn't find a great location within the existing directory structure for this, so LMK if it should be re-homed.

PiperOrigin-RevId: 484426543

docs/BUILD

@@ -0,0 +1,14 @@
+# Placeholder for internal Python strict binary compatibility macro.
+
+py_binary(
+    name = "build_py_api_docs",
+    srcs = ["build_py_api_docs.py"],
+    deps = [
+        "//mediapipe",
+        "//third_party/py/absl:app",
+        "//third_party/py/absl/flags",
+        "//third_party/py/tensorflow_docs",
+        "//third_party/py/tensorflow_docs/api_generator:generate_lib",
+        "//third_party/py/tensorflow_docs/api_generator:public_api",
+    ],
+)

docs/build_py_api_docs.py

@@ -0,0 +1,85 @@
+# Copyright 2022 The TensorFlow Authors. All Rights Reserved.
+#
+# 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.
+# ==============================================================================
+r"""MediaPipe reference docs generation script.
+
+This script generates API reference docs for the `mediapipe` PIP package.
+
+$> pip install -U git+https://github.com/tensorflow/docs mediapipe
+$> python build_py_api_docs.py
+"""
+
+import os
+
+from absl import app
+from absl import flags
+
+from tensorflow_docs.api_generator import generate_lib
+from tensorflow_docs.api_generator import public_api
+
+try:
+  # mediapipe has not been set up to work with bazel yet, so catch & report.
+  import mediapipe  # pytype: disable=import-error
+except ImportError as e:
+  raise ImportError('Please `pip install mediapipe`.') from e
+
+
+PROJECT_SHORT_NAME = 'mp'
+PROJECT_FULL_NAME = 'MediaPipe'
+
+_OUTPUT_DIR = flags.DEFINE_string(
+    'output_dir',
+    default='/tmp/generated_docs',
+    help='Where to write the resulting docs.')
+
+_URL_PREFIX = flags.DEFINE_string(
+    'code_url_prefix',
+    'https://github.com/google/mediapipe/tree/master/mediapipe',
+    'The url prefix for links to code.')
+
+_SEARCH_HINTS = flags.DEFINE_bool(
+    'search_hints', True,
+    'Include metadata search hints in the generated files')
+
+_SITE_PATH = flags.DEFINE_string('site_path', '/mediapipe/api_docs/python',
+                                 'Path prefix in the _toc.yaml')
+
+
+def gen_api_docs():
+  """Generates API docs for the mediapipe package."""
+
+  doc_generator = generate_lib.DocGenerator(
+      root_title=PROJECT_FULL_NAME,
+      py_modules=[(PROJECT_SHORT_NAME, mediapipe)],
+      base_dir=os.path.dirname(mediapipe.__file__),
+      code_url_prefix=_URL_PREFIX.value,
+      search_hints=_SEARCH_HINTS.value,
+      site_path=_SITE_PATH.value,
+      # This callback ensures that docs are only generated for objects that
+      # are explicitly imported in your __init__.py files. There are other
+      # options but this is a good starting point.
+      callbacks=[public_api.explicit_package_contents_filter],
+  )
+
+  doc_generator.build(_OUTPUT_DIR.value)
+
+  print('Docs output to:', _OUTPUT_DIR.value)
+
+
+def main(_):
+  gen_api_docs()
+
+
+if __name__ == '__main__':
+  app.run(main)