#!/usr/bin/env python2
try:
    import os,shutil,sys
except ImportError:
    print "[!] One or more library is missing...\n\n"
    exit(-1)

current_dir = '.'

if len(sys.argv) != 3:
    print 'Usage:\n\n%s <old_value> <new_value>\n\n' % (sys.argv[0])
    exit(-1)

for subdirs, dirs, files in os.walk(current_dir):
    for item in files:
        old_value = sys.argv[1].lower()
        new_value = sys.argv[2]

        #Getting a backup of the file
        shutil.copyfile(os.path.join(subdirs,item),os.path.join(subdirs,item)+'.backup')

        #Checking filename if it contains old value
        item_name = os.path.join(subdirs,item).lower()

        fp = open(item,'r')
        file_contents = fp.read()
        new_file_contents = file_contents.replace(old_value, new_value)

        if item_name.find(old_value) == -1:
            fp.write(new_file_contents)
        else:
            new_fp = open(item_name.replace(old_value, new_value),'w')
            new_fp.write(new_file_contents)
            new_fp.close()
        fp.close()