#!/usr/bin/env python3
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.

"""Rename all files in the given directory

Allows the current dir or chosen dir
Will append an extention given
"""
__all__ = ['main', 'input_opts']
__author__ = "Cody A. Taylor ( codemister99@yahoo.com )"
__version__ = "0.2 alpha"

import os, sys

def main():
    extention, dir = input_opts()
    for filename in sorted(os.listdir(dir)):
        new_name = input('Rename "{}" to: '.format(filename))
        if not new_name.endswith(extention):
            new_name += extention
        os.rename(dir + os.sep + filename, dir + os.sep + new_name)

def input_opts():
    if len(sys.argv) == 1:
        extention = input("Extention: ")
        dir = input("Directory [default {}]: ".format(os.getcwd())) or "."
        print(dir)
    else:
        if "--help" in sys.argv[1:]:
            print("Usage: {} [extention] [dir]".format(sys.argv[0]),
                  "Changes the name of all files in the given dir [default: $PWD]",
                  sep="\n")
            sys.exit(0)
        else:
            extention = sys.argv[1]
            try:
                dir = sys.argv[2]
            except IndexError:
                dir = "."
    return extention, dir

if __name__ == "__main__":
    main()