FileReplaceWithNewer

File copying

Description

I built this program so I can back up my files with only new files or files that have changed since the last backup. This program recursively walks down every directory tree until it finds a file, then adds or replaces this file into the backup directory.

Functionality

• Directory walking
• Selective file copying

Instructions

It uses only the standard library so can be run as is.

Source Code: replace_with_newer.py

import os
import shutil

from contextlib import contextmanager
from pathlib import Path


@contextmanager
def copy_work(working_dir, text_to_replace, replacement_text):
    """
    Recursive function that iterates down through source directory until a file is reached. If file is newer than same
    file in the target directory then replaces target file with source version. If source doesn't exist in target
    directory then copies source file into target directory.
    :param replacement_text: replacement text to put into source path i.e /a/b/<replacement_text>/file
    :param text_to_replace: text that needs to be replaced in source path i.e /a/b/<text_to_replace>/file
    :param working_dir: the source directory that contains the newest files.
    :return: copied file
    """
    os.chdir(working_dir)
    for file in Path.cwd().iterdir():
        if file.is_file():
            try:
                p1, p2 = os.path.getmtime(Path(file.as_posix())), os.path.getmtime(Path(
                    f'{os.path.split(file.as_posix())[0].replace(text_to_replace, replacement_text)}/{os.path.split(file.as_posix())[1]}').as_posix())
                if p1 > p2:
                    shutil.copy(Path(file).as_posix(), Path(
                        f'{os.path.split(file.as_posix())[0].replace(text_to_replace, replacement_text)}/{os.path.split(file.as_posix())[1]}'))
                    print(f'{Path(file).name} replaced.')
            except:
                shutil.copy(Path(file).as_posix(), Path(
                    f'{os.path.split(file.as_posix())[0].replace(text_to_replace, replacement_text)}/{os.path.split(file.as_posix())[1]}'))
                print(f'{Path(file).name} added.')
        else:
            copy_work(file, text_to_replace, replacement_text)