Rename set of directories with numeric part in it by adding 1 to the number.

FolderRotate.py

# coding=utf-8


#The MIT License (MIT)
#
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#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#THE SOFTWARE.


#  This small script renames a set of directories with numeric part in their name 
#  by adding 1 to the number.   It takes special care to numerically sort the 
#  list of directories and work from highest numbered directory to the lowest.
#  This way there will be no collisions
#
#  Example usage.
#
#  Say you have directories names /a/bob1.git /a/bob2.git /a/bob3.git
#
#  After running  this command
#
#   ./FolderRotate /a/bob*.git
#
#  You will end up with directories named  /a/bob2.git /a/bob3.git /a/bob4.git




import re
import sys
import os.path
from os import listdir, rename




def extract_num(name):
    """
    >>> extract_num('bob.1')
    '1'
    >>> extract_num('bob.2')
    '2'
    >>> extract_num('bob.2.git')
    '2'
    """
    m = re.search('[0-9]+', name )

    return m.group(0)


def incrname(name):
    """
    >>> incrname("bob.1.git")
    'bob.2.git'

    >>> incrname('x4')
    'x5'

    """

    n = extract_num(name)

    return re.sub(n,str(int(n)+1),name)


def ren_list(list):
    """
    >>> tList = ['bob.10.git', 'bob.2.git','bob.1.git','bob.3.git']
    >>> ren_list(tList)
    [('bob.10.git', 'bob.11.git'), ('bob.3.git', 'bob.4.git'), ('bob.2.git', 'bob.3.git'), ('bob.1.git', 'bob.2.git')]


    >>> tList = ['bob.8', 'bob.9','bob.10','bob.11']
    >>> ren_list(tList)
    [('bob.11', 'bob.12'), ('bob.10', 'bob.11'), ('bob.9', 'bob.10'), ('bob.8', 'bob.9')]


    """

    return [(x, incrname(x)) for x in sorted(list, key=lambda x: int(extract_num(x)), reverse=True)]



def rename_folders(folders):


    for (x,y) in ren_list(folders):

        print x, y

        os.rename(x, y)


def main():

    print sys.argv[1:]
    rename_folders(sys.argv[1:])


if __name__ == "__main__":
    main()