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"""Utils function relative to files
"""

__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "19/09/2016"

import os.path
import glob


def expand_filenames(filenames):
    """
    Takes a list of paths and expand it into a list of files.

    :param List[str] filenames: list of filenames or path with wildcards
    :rtype: List[str]
    :return: list of existing filenames or non-existing files
        (which was provided as input)
    """
    result = []
    for filename in filenames:
        if os.path.exists(filename):
            result.append(filename)
        elif glob.has_magic(filename):
            expanded_filenames = glob.glob(filename)
            if expanded_filenames:
                result += expanded_filenames
            else:  # Cannot expand, add as is
                result.append(filename)
        else:
            result.append(filename)
    return result
