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# Copyright 2022 Google LLC. 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.
"""FileFactory"""
load("//:visibility.bzl", "RULES_KOTLIN")
def FileFactory(ctx, base):
"""Creates files with names derived from some base file or prefix
Including the name of a rule is not always enough to guarantee unique filenames. For example,
helper functions that declare their own output files may be called multiple times in the same
rule impl.
Args:
ctx: ctx
base: [File|string] The file to derive other filenames from, or an exact base prefix
Returns:
FileFactory
"""
if type(base) == "File":
base = _scrub_base_file(ctx, base)
def declare_directory(suffix):
return ctx.actions.declare_directory(base + suffix)
def declare_file(suffix):
return ctx.actions.declare_file(base + suffix)
def derive(suffix):
return FileFactory(ctx, base + suffix)
return struct(
base_as_path = ctx.bin_dir.path + "/" + ctx.label.package + "/" + base,
declare_directory = declare_directory,
declare_file = declare_file,
derive = derive,
)
def _scrub_base_file(ctx, file):
if not file.extension:
fail("Base file must have an extension: was %s" % (file.path))
if file.owner.package != ctx.label.package:
fail("Base file must be from ctx package: was %s expected %s" % (file.owner.package, ctx.label.package))
return file.short_path.removeprefix(ctx.label.package + "/").rsplit(".", 1)[0]
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