#####################
# 
# Author: F. Lionetto
# Date: 07/10/2014
#

'''
Change the extension of all files in a given directory.

Run with:

python ChangeExtension.py --f <directory> --o <old extension> --n <new extension>
'''

import argparse
import os, sys

parser = argparse.ArgumentParser(description='Define directory, old extension, and new extension.')
# Define folder.
parser.add_argument('--f',type=str,help='directory')
# Define old extension.
parser.add_argument('--o',type=str,help='old extension')
# Define new extension.
parser.add_argument('--n',type=str,help='new extension')
args = parser.parse_args()

directory = args.f
for filename in os.listdir(directory) :
    infilename = os.path.join(directory,filename)
    if not os.path.isfile(infilename) : continue
    oldbase = os.path.splitext(filename)
    newname = infilename.replace(args.o,args.n)
    output = os.rename(infilename,newname)