google styled doc

mail_intake/parsers/subject.py

@@ -1,6 +1,10 @@
 """
 Subject line normalization utilities for Mail Intake.
 
+---
+
+## Summary
+
 This module provides helper functions for normalizing email subject lines
 to enable reliable thread-level comparison and grouping.
 
@@ -12,27 +16,34 @@ import re
 
 
 _PREFIX_RE = re.compile(r"^(re|fw|fwd)\s*:\s*", re.IGNORECASE)
-"""Regular expression matching common reply/forward subject prefixes."""
+"""
+Regular expression matching common reply/forward subject prefixes.
+"""
 
 
 def normalize_subject(subject: str) -> str:
     """
     Normalize an email subject for thread-level comparison.
 
-    Operations:
-    - Strips common prefixes such as ``Re:``, ``Fwd:``, and ``FW:``
-    - Repeats prefix stripping to handle stacked prefixes
-    - Collapses excessive whitespace
-    - Preserves original casing (no lowercasing)
-
-    This function is intentionally conservative and avoids aggressive
-    transformations that could alter the semantic meaning of the subject.
-
     Args:
-        subject: Raw subject line from a message header.
+        subject (str):
+            Raw subject line from a message header.
 
     Returns:
-        Normalized subject string suitable for thread grouping.
+        str:
+            Normalized subject string suitable for thread grouping.
+
+    Notes:
+        **Responsibilities:**
+
+            - Strips common prefixes such as ``Re:``, ``Fwd:``, and ``FW:``
+            - Repeats prefix stripping to handle stacked prefixes
+            - Collapses excessive whitespace
+            - Preserves original casing (no lowercasing)
+
+        **Guarantees:**
+
+            - This function is intentionally conservative and avoids aggressive transformations that could alter the semantic meaning of the subject
     """
     if not subject:
         return ""