1 files changed, 47 insertions, 0 deletions
diff --git a/rules/license_impl.bzl b/rules/license_impl.bzl
new file mode 100644
index 0000000..03477c6
--- /dev/null
+++ b/rules/license_impl.bzl
@@ -0,0 +1,47 @@
+# 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,
+        namespace = ctx.attr.namespace,
+    )
+    _debug(0, provider)
+    return [provider]