rules/license_impl.bzl

# Copyright 2022 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
#
# https://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.
"""Rules for declaring the licenses used by a package.

"""

load(
    "@rules_license//rules:providers.bzl",
    "LicenseInfo",
    "LicenseKindInfo",
)

# Debugging verbosity
_VERBOSITY = 0

def _debug(loglevel, msg):
    if _VERBOSITY > loglevel:
        print(msg)  # buildifier: disable=print

#
# license()
#

def license_rule_impl(ctx):
    provider = LicenseInfo(
        license_kinds = tuple([k[LicenseKindInfo] for k in ctx.attr.license_kinds]),
        copyright_notice = ctx.attr.copyright_notice,
        package_name = ctx.attr.package_name or ctx.build_file_path.rstrip("/BUILD"),
        package_url = ctx.attr.package_url,
        package_version = ctx.attr.package_version,
        license_text = ctx.file.license_text,
        label = ctx.label,
    )
    _debug(0, provider)
    return [provider]