import os
import datalad.api as dl


def move_submodule(repo_path, old_path, new_path):
    """
    Move a submodule to a new location.

    Parameters
    ----------

    old_path: str
        The old path of the module.
    new_path: str
        The new path of the module.
    """

    os.rename(repo_path + "/" + old_path, repo_path + "/" + new_path)
    with open(repo_path + '/.gitmodules', 'r') as fp:
        lines = fp.readlines()

    for line in lines:
        if line.startswith('\tpath'):
            line = line.replace(old_path, new_path)
            break
        if line.startswith('[submodule "projects/tmp"]'):
            line = line.replace(old_path, new_path)
            break
    with open(repo_path + '/.gitmodules', 'w') as fp:
        fp.writelines(lines)
    dl.save(repo_path, message="Move module from " + old_path + " to " + new_path, dataset=repo_path)