wp-rename

#! /usr/bin/env python3

import os
import random

PATH = os.getcwd()
BLACKLIST = [".git"]
ATLAS = [i for i in "abcdefghijklmnopqrstuvwxyz"]
WALL_DIR = "/media/storage/pictures/wallpapers/"

prevFiles = [os.path.splitext(f)[0] for f in os.listdir(WALL_DIR)]

def permutation(n, r):
    def factorial(n):
        if n == 0:
            return 1
        else:
            return n*factorial(n-1)
    return int(factorial(n)/factorial(n-r))


def nameGenerator(template: list, length: int) -> str:
    name = []
    while len(name) < length:
        letter = random.choice(template)
        if letter not in name:
            name.append(letter)
    return "".join(name)


def multiNameGenerator(template: list, length: int, amt: int) -> str:
    names = []
    while len(names) < amt:
        name = nameGenerator(template, length)
        if name not in names:
            if name not in prevFiles:
                names.append(name)
    return names


def randomRenamer(dire: str, blacklist: list, atlas: list, length: int) -> None:
    oldFiles = [i for i in os.listdir(dire) if i not in blacklist]
    nFiles = len(oldFiles)
    interFiles = [str(_+1).zfill(4)+os.path.splitext(oldFiles[_])[-1]
                  for _ in range(nFiles)]
    newNames = multiNameGenerator(atlas, length, nFiles)
    newFiles = [newNames[_] +
                os.path.splitext(oldFiles[_])[-1] for _ in range(nFiles)]
    confirmation = input(f"Are you sure you want to rename {nFiles} files? (Y/n) ")
    if confirmation in ["y", ""]:
        for _ in range(nFiles):
            os.rename(os.path.join(dire, oldFiles[_]), os.path.join(
                dire, interFiles[_]))
        for _ in range(nFiles):
            os.rename(os.path.join(
                dire, interFiles[_]), os.path.join(dire, newFiles[_]))
        print("Renamed %d files" % nFiles)
    elif confirmation=="n":
        pass
    else:
        print("Invalid option entered.")


if __name__ == "__main__":
    randomRenamer(PATH, BLACKLIST, ATLAS, 8)