showoptions

#!/usr/bin/env python3
#
# Display the contents of an Options ntuple within a ROOT file.
# 06-Dec-2022 WGS

import sys
from ROOT import TFile, gDirectory
debug = False

# Look at the arguments.
if ( len(sys.argv) < 2 ):
   print (sys.argv[0]," needs at least one argument: the name of the ROOT file with an Options nutple")
   sys.exit(1)

# Open the file. 
fileName = sys.argv[1]
try:
    myfile = TFile( fileName )
except OSError as error:
    print (error)
    sys.exit(1)

# If there is a second argument, it's the name of the ntuple
# that contains the options. 
ntupleName = 'Options'
if ( len(sys.argv) > 2 ):
   ntupleName = sys.argv[2]

# Retrieve the Options ntuple.
optionsNtuple = gDirectory.Get( ntupleName )

# Number of rows in the ntuple.
try:
    entries = optionsNtuple.GetEntriesFast()
except AttributeError as error:
    print ("There is no ntuple with the name",ntupleName,"in file",fileName)
    sys.exit(1)

if (debug):
    print ("number of options = ",entries)

# How we'll format the output. The "{:N.N}" format assures
# that the column width will be exactly N characters, truncating
# any strings that are longer than that. 
# Use different formats for string, int, and double values.

outputstring = "{:3.3} {:24.24} {:>18.18}  {:30.30}  {:15.15}"
outputint = "{:3.3} {:24.24} {:18}  {:30.30}  {:15.15}"
outputdouble = "{:3.3} {:24.24} {:18.15}  {:30.30}  {:15.15}"
outputunderline = "{:*^3} {:*^24} {:*^18}  {:*^30}  {:*^15}"

# Print a table heading
print (outputunderline.format("","","","",""))
print (outputstring.format("Abb","Name","Value","Description","Source"))
print (outputunderline.format("","","","",""))

# For each row in the ntuple:
for jentry in range( entries ):

    # Copy next entry into memory and verify.
    nb = optionsNtuple.GetEntry( jentry )
    if nb <= 0:
        continue

    try:
        name = optionsNtuple.OptionName
        value = optionsNtuple.OptionValue
        otype = optionsNtuple.OptionType
        brief = optionsNtuple.OptionBrief
        desc = optionsNtuple.OptionDesc
        source = optionsNtuple.OptionSource
    except AttributeError as error:
        print ("ntuple",ntupleName,"in file",fileName,"is not a complete options ntuple")
        sys.exit(1)

    # Display the numeric and boolean values in a more "natural" format.
    if ( otype == 'integer' ):
        ivalue = int(value)
        print (outputint.format(brief,name,ivalue,desc,source))
    elif ( otype == 'double' ):
        fvalue = float(value)
        print (outputdouble.format(brief,name,fvalue,desc,source))
    elif ( otype == 'flag'  or  otype == 'boolean'):
        bvalue = 'False'
        if ( value == '1' ):
            bvalue = 'True'
        print (outputstring.format(brief,name,bvalue,desc,source))
    else: 
        print (outputstring.format(brief,name,value,desc,source))

# Write a "bottom of table" delimiter.
print (outputunderline.format("","","","",""))