feat: Initial draft of GAPIC Bazel Extensions gapic-generator-python

BUILD.bazel

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+load("@gapic_generator_python_pip_deps//:requirements.bzl", "requirement")
+
+py_binary(
+    name = "gapic_generator_python",
+    srcs = glob(["gapic/**/*.py"]),
+    data = glob(["gapic/**/*.j2"]),
+    main = "gapic/cli/generate.py",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_google_protobuf//:protobuf_python",
+        requirement("click"),
+        requirement("google-api-core"),
+        requirement("googleapis-common-protos"),
+        requirement("grpcio"),
+        requirement("protobuf"),
+        requirement("jinja2"),
+        requirement("pypandoc"),
+        requirement("PyYAML"),
+    ],
+    python_version = "PY3",
+)

WORKSPACE

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+workspace(name = "gapic_generator_python")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+http_archive(
+    name = "rules_python",
+    url = "https://github.com/bazelbuild/rules_python/archive/748aa53d7701e71101dfd15d800e100f6ff8e5d1.zip",
+    strip_prefix = "rules_python-748aa53d7701e71101dfd15d800e100f6ff8e5d1"
+)
+load("@rules_python//python:repositories.bzl", "py_repositories")
+py_repositories()
+
+# Only needed if using the packaging rules.
+load("@rules_python//python:pip.bzl", "pip_repositories")
+pip_repositories()
+
+
+
+load("@rules_python//python:pip.bzl", "pip_import")
+
+pip_import(   # or pip3_import
+   name = "gapic_generator_python_pip_deps",
+   requirements = "@gapic_generator_python//:requirements.txt",
+   python_interpreter = "python3",
+)
+
+load("@gapic_generator_python_pip_deps//:requirements.bzl", "pip_install")
+pip_install()
+
+local_repository(
+    name = "com_google_api_codegen",
+    path = "/usr/local/google/home/vam/_/projects/github/vam-google/gapic-generator",
+)

repositories.bzl

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+load("@rules_python//python:pip.bzl", "pip_import")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+def com_google_protoc_java_resource_names_plugin_repositories():
+    _protobuf_version = "3.11.2"
+    _protobuf_version_in_link = "v%s" % _protobuf_version
+    _maybe(
+        http_archive,
+        name = "com_google_protobuf",
+        urls = ["https://github.com/protocolbuffers/protobuf/archive/%s.zip" % _protobuf_version_in_link],
+        strip_prefix = "protobuf-%s" % _protobuf_version,
+    )
+
+    _maybe(
+        http_archive,
+        name = "bazel_skylib",
+        sha256 = "bbccf674aa441c266df9894182d80de104cabd19be98be002f6d478aaa31574d",
+        strip_prefix = "bazel-skylib-2169ae1c374aab4a09aa90e65efe1a3aad4e279b",
+        urls = ["https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz"],
+    )
+
+
+    pip_import(
+        name = "examples_helloworld",
+        requirements = "@rules_python//examples/helloworld:requirements.txt",
+    )
+
+
+def _maybe(repo_rule, name, strip_repo_prefix = "", **kwargs):
+    if not name.startswith(strip_repo_prefix):
+        return
+    repo_name = name[len(strip_repo_prefix):]
+    if repo_name in native.existing_rules():
+        return
+    repo_rule(name = repo_name, **kwargs)

requirements.txt

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+click >= 6.7
+google-api-core >= 1.14.3
+googleapis-common-protos >= 1.6.0
+grpcio >= 1.24.3
+jinja2 >= 2.10
+protobuf >= 3.7.1
+pypandoc >= 1.4
+PyYAML >= 5.1.1

rules_python_gapic/py_gapic.bzl

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+load("@com_google_api_codegen//rules_gapic:gapic.bzl", "proto_custom_library")
+
+def py_gapic_library2(name, srcs, **kwargs):
+#    srcjar_target_name = "%s_srcjar" % name
+    srcjar_target_name = name
+    srcjar_output_suffix = ".srcjar"
+
+    proto_custom_library(
+        name = srcjar_target_name,
+        deps = srcs,
+        plugin = Label("@gapic_generator_python//:gapic_generator_python"),
+        plugin_args = [],
+        plugin_file_args = {},
+        output_type = "python_gapic",
+        output_suffix = srcjar_output_suffix,
+        **kwargs
+    )
+