kleaf/print_debug.bzl

# Copyright (C) 2022 The Android Open Source Project
#
# 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.

def _print_debug_impl(ctx):
    prefix = {}
    if ctx.attr.prefix_label:
        prefix = "{}: ".format(ctx.label)
    print("{}{}".format(prefix, ctx.attr.content))

print_debug = rule(
    implementation = _print_debug_impl,
    doc = "A rule that prints a debug string when built. No outputs are generated.",
    attrs = {
        "prefix_label": attr.bool(
            default = True,
            doc = "Prefix with the label of this target.",
        ),
        "content": attr.string(doc = "The string to print."),
    },
)