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#!/usr/bin/env python3
#
# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
# MIT license
#
# Weitian LI
# 2017-02-06
"""
Determine the Chandra ACIS type for the given observation.
TODO: move these methods to module `acis.py`
"""
import argparse
import subprocess
import re
from setup_pfiles import setup_pfiles
def get_acis_type(filepath):
"""
Determine the Chandra ACIS type (``I`` or ``S``) according the
active ACIS chips.
Parameters
----------
filepath : str
Path to the input FITS file
Returns
-------
acis_type : str
``I`` if ACIS-I, ``S`` if ACIS-S, otherwise, ``ValueError`` raised.
"""
subprocess.check_call(["punlearn", "dmkeypar"])
detnam = subprocess.check_output([
"dmkeypar", "infile=%s" % filepath, "keyword=DETNAM", "echo=yes"
]).decode("utf-8").strip()
if re.match(r"^ACIS-0123", detnam):
return "I"
elif re.match(r"^ACIS-[0-6]*7", detnam):
return "S"
else:
raise ValueError("unknown chip combination: %s" % detnam)
def get_chips(filepath, sep=":"):
"""
Get the corresponding chips of interest according to the active ACIS type.
Parameters
----------
filepath : str
Path to the input FITS file
sep : str, optional
Separator to join the chip ranges, e.g., 0:3, 0-3
Returns
-------
chips : str
``0:3`` if ACIS-I, ``7`` if ACIS-S, otherwise, ``ValueError`` raised.
"""
acis_type = get_acis_type(filepath)
if acis_type == "I":
return sep.join(["0", "3"])
elif acis_type == "S":
return "7"
else:
raise ValueError("unknown ACIS type")
def main():
parser = argparse.ArgumentParser(description="Determine Chandra ACIS type")
parser.add_argument("-b", "--brief", dest="brief",
action="store_true", help="Be brief")
parser.add_argument("infile", help="Input FITS file")
args = parser.parse_args()
setup_pfiles(["dmkeypar"])
acis_type = get_acis_type(args.infile)
if not args.brief:
print("ACIS-type:", end=" ")
print(acis_type)
if __name__ == "__main__":
main()
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