55 lines
1.7 KiB
Python
55 lines
1.7 KiB
Python
# Copyright 2020 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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select_file() build rule implementation.
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Selects a single file from the outputs of some target by given relative path.
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"""
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def _impl(ctx):
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if ctx.attr.subpath and len(ctx.attr.subpath) == 0:
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fail("Subpath can not be empty.")
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out = None
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canonical = ctx.attr.subpath.replace("\\", "/")
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for file_ in ctx.attr.srcs.files.to_list():
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if file_.path.replace("\\", "/").endswith(canonical):
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out = file_
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break
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if not out:
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files_str = ",\n".join([
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str(f.path)
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for f in ctx.attr.srcs.files.to_list()
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])
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fail("Can not find specified file in [%s]" % files_str)
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return [DefaultInfo(files = depset([out]))]
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select_file = rule(
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implementation = _impl,
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doc = "Selects a single file from the outputs of some target \
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by given relative path",
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attrs = {
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"srcs": attr.label(
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allow_files = True,
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mandatory = True,
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doc = "The target producing the file among other outputs",
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),
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"subpath": attr.string(
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mandatory = True,
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doc = "Relative path to the file",
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),
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},
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)
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