from __future__ import unicode_literals

import os.path


class Prefix(object):
    def __init__(self, prefix_dir):
        self.prefix_dir = prefix_dir

    def path(self, *parts):
        return os.path.normpath(os.path.join(self.prefix_dir, *parts))

    def exists(self, *parts):
        return os.path.exists(self.path(*parts))

    def star(self, end):
        paths = os.listdir(self.prefix_dir)
        return tuple(path for path in paths if path.endswith(end))