tools/build/bazel/pom_file.bzl

# Copyright 2015 The Bazel Authors. All rights reserved.
#
# 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.

load("//tools/build/bazel:generate_workspace.bzl", "maven_coordinates")

def _impl(ctx):
  arguments = [
      ctx.outputs.pom.path,
      maven_coordinates(ctx.attr.artifact)
  ]

  for dep in ctx.attr.deps:
    arguments += [ maven_coordinates(dep.label) ]

  ctx.actions.run(
      inputs = ctx.files.deps,
      outputs = [ctx.outputs.pom],
      progress_message = "Generating pom file for %s" %  ctx.attr.name,
      arguments = arguments,
      executable = ctx.executable._pom_generator,
  )

pom_file = rule(
    attrs = {
        "artifact": attr.string(),
        "deps": attr.label_list(allow_files = True),
        "_pom_generator": attr.label(
            executable = True,
            cfg = "host",
            allow_files = True,
            default = Label("//tools/build/bazel:pom_generator"),
        )
    },
    implementation = _impl,
    outputs = {"pom" : "%{name}.pom"},
)