1 files changed, 62 insertions, 0 deletions
diff --git a/scripts/chandra_acis.py b/scripts/chandra_acis.py
new file mode 100755
index 0000000..2dcc62e
--- /dev/null
+++ b/scripts/chandra_acis.py
@@ -0,0 +1,62 @@
+#!/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.
+"""
+
+import argparse
+import subprocess
+import re
+
+from setup_pfiles import setup_pfiles
+
+
+def get_acis_type(infile):
+    """
+    Determine the Chandra ACIS type (``I`` or ``S``) according the
+    active ACIS chips.
+
+    Parameters
+    ----------
+    infile : str
+        Filename of the 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" % infile, "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 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()