Configure linters.

Introduce flake8 and mypy for better error checking.
Fix all errors and warnings emitted by those.
Also fix type error with `url_for`.

1 files changed, 7 insertions, 2 deletions

diff --git a/mu4web/util.py b/mu4web/util.py
index c8ccc7d..41601c5 100644
--- a/mu4web/util.py
+++ b/mu4web/util.py
@@ -1,8 +1,13 @@
 import subprocess
+from os import PathLike
+from typing import (
+    Union,
+)
 
 
-def find(basedir, **flags) -> list[bytes]:
-    cmdline = ['find', basedir]
+def find(basedir: PathLike,
+         **flags: str | bytes) -> list[bytes]:
+    cmdline: list[Union[str, bytes, PathLike]] = ['find', basedir]
     for key, value in flags.items():
         cmdline += [f'-{key}', value]
     cmdline.append('-print0')