1 files changed, 10 insertions, 0 deletions
diff --git a/mdbp/common.py b/mdbp/common.py
index ba4b20d..df434cb 100644
--- a/mdbp/common.py
+++ b/mdbp/common.py
@@ -4,6 +4,7 @@
 from __future__ import annotations
 import argparse
 import contextlib
+import fnmatch
 import hashlib
 import importlib.resources
 import json
@@ -181,3 +182,12 @@ def tar_add(tarobj: tarfile.TarFile, path: pathlib.Path) -> None:
     info.mtime = int(statres.st_mtime)
     with path.open("rb") as fobj:
         tarobj.addfile(info, fobj)
+
+
+def clean_dir(directory: pathlib.Path, patterns: typing.List[str]) -> None:
+    """Delete all entries of `directory` that match none of the given
+    `patterns`."""
+    for entry in directory.iterdir():
+        if not any(fnmatch.fnmatchcase(entry.name, pattern)
+                   for pattern in patterns):
+            entry.unlink()