4ef7a1a594
- Allow passing list of explicit fieldnames, instead of sorting header names. - Allow passing a single zip file with all CSV files to merge. Bug: 145132366 Test: diff -w out/soong/hiddenapi/hiddenapi-greylist.csv Change-Id: I7c6db369069452293c15eec290c635fb3879275d
70 lines
2.4 KiB
Python
Executable File
70 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Copyright (C) 2018 The Android Open Source Project
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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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Merge multiple CSV files, possibly with different columns.
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"""
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import argparse
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import csv
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import io
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from zipfile import ZipFile
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args_parser = argparse.ArgumentParser(description='Merge given CSV files into a single one.')
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args_parser.add_argument('--header', help='Comma separated field names; '
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'if missing determines the header from input files.')
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args_parser.add_argument('--zip_input', help='ZIP archive with all CSV files to merge.')
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args_parser.add_argument('--output', help='Output file for merged CSV.',
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default='-', type=argparse.FileType('w'))
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args_parser.add_argument('files', nargs=argparse.REMAINDER)
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args = args_parser.parse_args()
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def dict_reader(input):
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return csv.DictReader(input, delimiter=',', quotechar='|')
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if args.zip_input and len(args.files) > 0:
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raise ValueError('Expecting either a single ZIP with CSV files'
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' or a list of CSV files as input; not both.')
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csv_readers = []
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if len(args.files) > 0:
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for file in args.files:
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csv_readers.append(dict_reader(open(file, 'r')))
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elif args.zip_input:
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with ZipFile(args.zip_input) as zip:
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for entry in zip.namelist():
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if entry.endswith('.uau'):
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csv_readers.append(dict_reader(io.TextIOWrapper(zip.open(entry, 'r'))))
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headers = set()
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if args.header:
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fieldnames = args.header.split(',')
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else:
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# Build union of all columns from source files:
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for reader in csv_readers:
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headers = headers.union(reader.fieldnames)
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fieldnames = sorted(headers)
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# Concatenate all files to output:
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writer = csv.DictWriter(args.output, delimiter=',', quotechar='|', quoting=csv.QUOTE_MINIMAL,
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dialect='unix', fieldnames=fieldnames)
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writer.writeheader()
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for reader in csv_readers:
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for row in reader:
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writer.writerow(row)
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