move shellpattern module to borg.helpers

src/borg/manifest.py

@@ -11,7 +11,7 @@ from .logger import create_logger
 
 logger = create_logger()
 
-from . import shellpattern
+from .helpers import shellpattern
 from .constants import *  # NOQA
 from .helpers.datastruct import StableDict
 from .helpers.parseformat import bin_to_hex

src/borg/patterns.py

@@ -7,8 +7,7 @@ import unicodedata
 from collections import namedtuple
 from enum import Enum
 
-from . import shellpattern
-from .helpers import clean_lines
+from .helpers import clean_lines, shellpattern
 from .helpers.errors import Error
 
 

src/borg/testsuite/shellpattern.py

@@ -2,7 +2,7 @@ import re
 
 import pytest
 
-from .. import shellpattern
+from ..helpers import shellpattern
 
 
 def check(path, pattern):