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defragment.py
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defragment.py
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# Licensed under a 3-clause BSD style license - see LICENSE.rst
# -*- coding: utf-8 -*-
"""
Defragment command.
"""
import os
import asdf
from .main import Command
from .. import AsdfFile
__all__ = ['defragment']
class Defragment(Command):
@classmethod
def setup_arguments(cls, subparsers):
parser = subparsers.add_parser(
str("defragment"), help="Defragment an ASDF file..",
description="""Removes any unused blocks and unused space.""")
parser.add_argument(
'filename', nargs=1,
help="""The ASDF file to collect.""")
parser.add_argument(
"--output", "-o", type=str, nargs="?",
help="""The name of the output file.""")
parser.add_argument(
"--resolve-references", "-r", action="store_true",
help="""Resolve all references and store them directly in
the output file.""")
parser.add_argument(
"--compress", "-c", type=str, nargs="?",
choices=['zlib', 'bzp2', 'lz4'],
help="""Compress blocks using one of "zlib", "bzp2" or "lz4".""")
parser.set_defaults(func=cls.run)
return parser
@classmethod
def run(cls, args):
return defragment(args.filename[0], args.output,
args.resolve_references, args.compress)
def defragment(input, output=None, resolve_references=False, compress=None):
"""
Defragment a given ASDF file.
Parameters
----------
input : str or file-like object
The input file.
output : str of file-like object
The output file.
resolve_references : bool, optional
If `True` resolve all external references before saving.
compress : str, optional
Compression to use.
"""
with asdf.open(input) as ff:
ff2 = AsdfFile(ff)
if resolve_references:
ff2.resolve_references()
ff2.write_to(
output,
all_array_storage='internal',
all_array_compression=compress)