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Add a rule to create providers for subdirectories
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# Copyright 2024 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. | ||
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"""Skylib module containing rules to create metadata about subdirectories.""" | ||
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load(":providers.bzl", "DirectoryInfo") | ||
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visibility("public") | ||
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_DIR_NOT_FOUND = """{dir} does not contain a directory named {name}. | ||
Instead, it contains the directories {children}.""" | ||
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def _subdirectory_impl(ctx): | ||
dir = ctx.attr.parent[DirectoryInfo] | ||
if ctx.attr.path.startswith("/"): | ||
fail("Invalid path. Path must be relative to the parent directory") | ||
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for dirname in ctx.attr.path.split("/"): | ||
if dirname not in dir.directories: | ||
fail(_DIR_NOT_FOUND.format( | ||
dir = dir.source_path, | ||
name = repr(dirname), | ||
children = repr(sorted(dir.directories)), | ||
)) | ||
dir = dir.directories[dirname] | ||
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return [ | ||
dir, | ||
DefaultInfo(files = dir.transitive_files), | ||
] | ||
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subdirectory = rule( | ||
implementation = _subdirectory_impl, | ||
attrs = { | ||
"parent": attr.label(providers = [DirectoryInfo], mandatory = True), | ||
"path": attr.string(mandatory = True), | ||
}, | ||
provides = [DirectoryInfo], | ||
) |
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