gapic_generator_java.bzl

# Copyright 2020 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.

def google_java_format(name, srcs, formatter):
    native.genrule(
        name = name,
        outs = ["%s.sh" % name],
        srcs = srcs,
        # TODO: this may fail if list of files is too long (exceeds max command line limit in shell).
        #       Split the command into multiple executions if this ever fails (good enough for now)
        cmd = "echo ' $(location %s) --replace $(SRCS)' > $@" % formatter,
        executable = True,
        tools = [formatter],
        local = 1,
    )

def _google_java_format_verification_impl(ctx):
    src_files = [src.path for src in ctx.files.srcs]
    output_file = ctx.outputs.output_file
    formatter = ctx.executable.formatter

    ctx.actions.run_shell(
        inputs = ctx.files.srcs,
        arguments = ["--dry-run", "--set-exit-if-changed"] + src_files,
        tools = [formatter],
        command = "%s $@ > %s" % (formatter.path, output_file.path),
        outputs = [output_file],
        progress_message =
            "If this target fails check the list of files that must be formatted in %s" % output_file.path,
    )

google_java_format_verification = rule(
    attrs = {
        "srcs": attr.label_list(allow_files = True),
        "formatter": attr.label(
            executable = True,
            cfg = "host",
        ),
    },
    outputs = {"output_file": "%{name}.txt"},
    implementation = _google_java_format_verification_impl,
)