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95 lines
2.4 KiB
95 lines
2.4 KiB
from __future__ import absolute_import
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import argparse
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import io
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import sys
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from . import snappy_formats as formats
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from .snappy import UncompressError
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def cmdline_main():
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"""This method is what is run when invoking snappy via the commandline.
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Try python -m snappy --help
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"""
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stdin = sys.stdin
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if hasattr(sys.stdin, "buffer"):
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stdin = sys.stdin.buffer
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stdout = sys.stdout
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if hasattr(sys.stdout, "buffer"):
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stdout = sys.stdout.buffer
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parser = argparse.ArgumentParser(
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description="Compress or decompress snappy archive"
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)
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument(
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'-c',
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dest='compress',
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action='store_true',
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help='Compress'
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)
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group.add_argument(
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'-d',
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dest='decompress',
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action='store_true',
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help='Decompress'
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)
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parser.add_argument(
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'-t',
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dest='target_format',
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default=formats.DEFAULT_FORMAT,
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choices=formats.ALL_SUPPORTED_FORMATS,
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help=(
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'Target format, default is "{}"'.format(formats.DEFAULT_FORMAT)
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)
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)
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parser.add_argument(
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'infile',
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nargs='?',
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type=argparse.FileType(mode='rb'),
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default=stdin,
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help="Input file (or stdin)"
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)
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parser.add_argument(
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'outfile',
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nargs='?',
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type=argparse.FileType(mode='wb'),
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default=stdout,
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help="Output file (or stdout)"
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)
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args = parser.parse_args()
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# workaround for https://bugs.python.org/issue14156
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if isinstance(args.infile, io.TextIOWrapper):
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args.infile = stdin
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if isinstance(args.outfile, io.TextIOWrapper):
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args.outfile = stdout
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additional_args = {}
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if args.compress:
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method = formats.get_compress_function(args.target_format)
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else:
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try:
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method, read_chunk = formats.get_decompress_function(
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args.target_format,
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args.infile
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)
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except UncompressError as err:
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sys.exit("Failed to get decompress function: {}".format(err))
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additional_args['start_chunk'] = read_chunk
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method(args.infile, args.outfile, **additional_args)
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if __name__ == "__main__":
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try:
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cmdline_main()
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except Exception as err:
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sys.exit("%s: %s" % (err.__class__.__name__, err))
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