From 86e7ecd4a9382128f96cd345120485aeba25177f Mon Sep 17 00:00:00 2001
From: Aaron LI <aaronly.me@outlook.com>
Date: Mon, 11 Jul 2016 22:27:38 +0800
Subject: calc_coolfunc.py: Use a default config to allow a minimal user config

---
 calc_coolfunc.py | 48 ++++++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 22 deletions(-)

diff --git a/calc_coolfunc.py b/calc_coolfunc.py
index a9bee09..32a7ada 100755
--- a/calc_coolfunc.py
+++ b/calc_coolfunc.py
@@ -4,9 +4,11 @@
 #
 # Aaron LI
 # Created: 2016-06-19
-# Updated: 2016-07-04
+# Updated: 2016-07-11
 #
 # Change logs:
+# 2016-07-11:
+#   * Use a default config to allow a minimal user config
 # 2016-07-04:
 #   * Use "AstroParams"
 #   * Update to use 3-column temperature profile
@@ -39,27 +41,40 @@ using the XSPEC `flux` command, and the cooling function has
 dimension of [ FLUX / EM ].
 
 See also the documentation of `deproject_sbp.py` for more details.
+"""
+
+
+import argparse
+import subprocess
+import sys
+import os
+from datetime import datetime
+
+import numpy as np
+import astropy.units as au
+from astropy.cosmology import FlatLambdaCDM
+from configobj import ConfigObj
+
+from astro_params import AstroParams
 
 
-Sample configuration file:
-------------------------------------------------------------
+config_default = """
 ## Configuration file for `calc_coolfunc.py`
-## 2016-07-04
 
 # temperature profile fitted & extrapolated by model: [r, T]
 t_profile = t_profile.txt
 
 # average abundance (unit: solar)
-abundance = <ABUND>
+abundance = -1
 
 # abundance table (default: grsa)
 abund_table = grsa
 
 # redshift of the object
-redshift = <REDSHIFT>
+redshift = -1
 
 # H column density (unit: 10^22 cm^-2)
-nh = <NH>
+nh = -1
 
 # energy range within which to calculate the cooling function (unit: keV)
 energy_low = 0.7
@@ -70,22 +85,8 @@ xspec_script = coolfunc.xcm
 
 # output file of the cooling function profile: [r, CF]
 coolfunc = coolfunc_profile.txt
-------------------------------------------------------------
 """
 
-import argparse
-import subprocess
-import sys
-import os
-from datetime import datetime
-
-import numpy as np
-import astropy.units as au
-from astropy.cosmology import FlatLambdaCDM
-from configobj import ConfigObj
-
-from astro_params import AstroParams
-
 
 def gen_xspec_script(outfile, data):
     """
@@ -181,7 +182,10 @@ def main():
                         help="config for cooling function calculation " +
                              "(default: coolfunc.conf)")
     args = parser.parse_args()
-    config = ConfigObj(args.config)
+
+    config = ConfigObj(config_default.splitlines())
+    config_user = ConfigObj(args.config)
+    config.merge(config_user)
 
     redshift = config.as_float("redshift")
     config_data = {
-- 
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