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c48e487998
Previously code generators would unconditionally write the generated files even if they didn't change, causing all many more files to be rebuilt than necessary. Make extract_json.py check the file content to skip writing if it can to fix this. Bug: None Change-Id: I22389444179c9b16a7ccc03ea133a973d419fad3 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/45761 Auto-Submit: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Austin Eng <enga@chromium.org>
45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
#!/usr/bin/env python3
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# Copyright 2018 The Dawn Authors
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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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import os, sys, json
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if __name__ == "__main__":
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if len(sys.argv) != 3:
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print("Usage: extract_json.py JSON DIR")
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sys.exit(1)
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with open(sys.argv[1]) as f:
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files = json.loads(f.read())
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output_dir = sys.argv[2]
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for (name, content) in files.items():
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output_file = output_dir + os.path.sep + name
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# Create the output directory if needed.
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directory = os.path.dirname(output_file)
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if not os.path.exists(directory):
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os.makedirs(directory)
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# Skip writing to the file if it already has the correct content.
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try:
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with open(output_file, 'r') as outfile:
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if outfile.read() == content:
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continue
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except (OSError, EnvironmentError):
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pass
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with open(output_file, 'w') as outfile:
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outfile.write(content)
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