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"""
Implementation of command for converting ASDF-in-FITS to standalone ASDF file.
"""
import asdf
from asdf.fits_embed import AsdfInFits
from .main import Command
__all__ = ["extract_file"]
class AsdfExtractor(Command): # pragma: no cover
"""This class is the plugin implementation for the asdftool runner."""
@classmethod
def setup_arguments(cls, subparsers):
parser = subparsers.add_parser(
"extract",
help="Extract ASDF extensions in ASDF-in-FITS files into pure ASDF files",
description="Extracts ASDF extensions into pure ASDF files.",
)
parser.add_argument(
"infile", action="store", type=str, help="Name of ASDF-in-FITS file containing extension to be extracted"
)
parser.add_argument(
"outfile", action="store", type=str, help="Name of new pure ASDF file containing extracted extension"
)
parser.set_defaults(func=cls.run)
return parser
@classmethod
def run(cls, args):
return extract_file(args.infile, args.outfile)
def extract_file(input_file, output_file):
"""Function for performing extraction from ASDF-in-FITS to pure ASDF."""
try:
with asdf.open(input_file) as ih:
if not isinstance(ih, AsdfInFits):
raise RuntimeError(f"Given input file '{input_file}' is not ASDF-in-FITS")
with asdf.AsdfFile(ih.tree) as oh:
oh.write_to(output_file)
except (OSError, ValueError) as error:
raise RuntimeError(str(error))
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