Fix and harden linter checks.

Harden the requirements of mypy, and also check against flake8
docstrings. And fix all errors and warnings resulting from that.

1 files changed, 9 insertions, 0 deletions

diff --git a/mu4web/maildir.py b/mu4web/maildir.py
index dd5be1c..cbac7c4 100644
--- a/mu4web/maildir.py
+++ b/mu4web/maildir.py
@@ -1,3 +1,10 @@
+"""
+Functions for finding and querying maildirs.
+
+A maildir here is a directory containing a cur, new, and tmp
+directory.
+"""
+
 from dataclasses import dataclass
 import os.path
 
@@ -21,12 +28,14 @@ except ModuleNotFoundError:
 @dataclass
 class MaildirEntry:
     """A single maildir, used by find_maildirs."""
+
     name: str
 
 
 @dataclass
 class MaildirGroup:
     """A group of maildir, which isn't a maildir in itself."""
+
     name: str
     children: list[Union[MaildirEntry, 'MaildirGroup']]