forked from lix-project/lix
Qyriad
723ddadf92
This should be capable of replacing every invocation of
nix eval --write-to.
Change-Id: I60387bc9b0fc54a91244eddb639beaa64d705878
62 lines
1.8 KiB
Python
Executable file
62 lines
1.8 KiB
Python
Executable file
#!/usr/bin/env python3
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"""
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This script is a helper for this project's Meson buildsystem, to replace its
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usage of `nix eval --write-to`. Writing a JSON object as a nested directory
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tree is more generic, easier to maintain, and far, far less cursed. Nix
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has 'good' support for JSON output. Let's just use it.
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"""
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import argparse
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from pathlib import Path
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import json
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import sys
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name = 'json-to-tree.py'
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def log(*args, **kwargs):
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kwargs['file'] = sys.stderr
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return print(f'{name}:', *args, **kwargs)
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def write_dict_to_directory(current_directory: Path, data: dict, files_written=0):
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current_directory.mkdir(parents=True, exist_ok=True)
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for key, value in data.items():
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nested_path = current_directory / key
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match value:
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case dict(nested_data):
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files_written += write_dict_to_directory(nested_path, nested_data)
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case str(content):
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nested_path.write_text(content)
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files_written += 1
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case rest:
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assert False, \
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f'should have been called on a dict or string, not {type(rest)=}\n\t{rest=}'
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return files_written
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def main():
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parser = argparse.ArgumentParser(name)
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parser.add_argument('-i', '--input', type=argparse.FileType('r'), default='-',
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help='The JSON input to operate on and output as a directory tree',
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)
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parser.add_argument('-o', '--output', type=Path, required=True,
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help='The place to put the directory tree',
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)
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args = parser.parse_args()
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json_string = args.input.read()
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try:
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data = json.loads(json_string)
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except json.JSONDecodeError:
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log(f'could not decode JSON from input: {json_string}')
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raise
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files_written = write_dict_to_directory(args.output, data)
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log(f'wrote {files_written} files')
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sys.exit(main())
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