#   Copyright 2021 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.
"""Tool to generate external api_docs for FQE (Shameless copy from TFQ)."""

import os

from absl import app
from absl import flags
from tensorflow_docs.api_generator import doc_controls
from tensorflow_docs.api_generator import generate_lib
from tensorflow_docs.api_generator import public_api

import fqe

flags.DEFINE_string("output_dir", "/tmp/openfermion_api",
                    "Where to output the docs")

flags.DEFINE_string("code_url_prefix",
                    ("https://github.com/quantumlib/OpenFermion-FQE/tree/master/src"
                     "fqe"), "The url prefix for links to code.")

flags.DEFINE_bool("search_hints", True,
                  "Include metadata search hints in the generated files")

flags.DEFINE_string("site_path", "quark/openfermion_fqe/api_docs/python",
                    "Path prefix in the _toc.yaml")

FLAGS = flags.FLAGS


def main(unused_argv):

    doc_generator = generate_lib.DocGenerator(
        root_title="OpenFermion-FQE",
        py_modules=[("fqe", fqe)],
        base_dir=os.path.dirname(fqe.__file__),
        code_url_prefix=FLAGS.code_url_prefix,
        search_hints=FLAGS.search_hints,
        site_path=FLAGS.site_path,
        callbacks=[public_api.local_definitions_filter],
    )

    doc_generator.build(output_dir=FLAGS.output_dir)


if __name__ == "__main__":
    app.run(main)

Add script to build API docs.