migrate_grails.py

#!/bin/python
import click
from os import walk, makedirs
from os.path import join
from shutil import copy

@click.command()
@click.option('--source', help="""Path to the grails 2 project""", type=file)
@click.option('--destination',
        help="""Path to the bootstrapped grails 3 project""", type=file)
def migrate(source, destination):
    pass


def migrate_folder(old_folder, new_folder, destination_root):
    """
    Both old_folder and new_folder are expected to be paths (str)
    destination_root has to be an absolute one.
    will move files present in old_folder but not in new_folder.
    """
    old_files, old_folders = gather_paths(old_folder)
    new_files, new_folders = gather_paths(new_folder)
    create_folders(old_folders, new_folders)
    move_files(old_files, new_files)


def get_diff(paths1, paths2):
    """
    Returns paths present in paths1 but absent in paths2
    """
    diff = [p for p in paths1 if not p in paths2]
    return diff


def move_files(old_files, new_files, destination_root):
    diff = get_diff(old_files, new_files)
    diff = [(p,join(destination_root, p)) for p in diff]
    for old_path, new_path in diff:
        copy(old_path, new_path)


def create_folders(old_folders, new_folders, destination_root):
    diff = get_diff(old_folders, new_folders)
    diff = [join(destination_root, p) for p in diff]
    for p in diff:
        makedirs(p)

def gather_paths(folder):
    """
    For given path returns tuple:
    files, folders
    each being a list of paths relative to folder
    """
    files_present = []
    folders_present = []
    for root, dirs, files in walk(folder):
        for name in files:
            files_present.append(os.path.join(root, name))
        for name in dirs:
            folders_present.append(os.path.join(root, name))
    return files_present, folders_present


if __name__ == "__main__":
    migrate()