PEP 676: Display mailing list names for thread links in Discussions-To

pep_sphinx_extensions/pep_processor/transforms/pep_headers.py

@@ -39,12 +39,12 @@ def apply(self) -> None:
         # Extract PEP number
         value = pep_field[1].astext()
         try:
-            pep = int(value)
+            pep_num = int(value)
         except ValueError:
             raise PEPParsingError(f"'PEP' header must contain an integer. '{value}' is invalid!")
 
         # Special processing for PEP 0.
-        if pep == 0:
+        if pep_num == 0:
             pending = nodes.pending(pep_zero.PEPZero)
             self.document.insert(1, pending)
             self.document.note_pending(pending)
@@ -71,9 +71,16 @@ def apply(self) -> None:
             if name in {"author", "bdfl-delegate", "pep-delegate", "discussions-to", "sponsor"}:
                 # mask emails
                 for node in para:
-                    if isinstance(node, nodes.reference):
-                        pep_num = pep if name == "discussions-to" else None
-                        node.replace_self(_mask_email(node, pep_num))
+                    if not isinstance(node, nodes.reference):
+                        continue
+                    if name == "discussions-to":
+                        if node["refuri"].startswith("http"):
+                            node[0] = _list_name_from_thread(node)
+                        else:
+                            node[0] = _mask_email(node)
+                            node["refuri"] += f"?subject=PEP%20{pep_num}"
+                    else:
+                        node.replace_self(_mask_email(node))
             elif name in {"replaces", "superseded-by", "requires"}:
                 # replace PEP numbers with normalised list of links to PEPs
                 new_body = []
@@ -88,3 +95,22 @@ def apply(self) -> None:
         # Remove unneeded fields
         for field in fields_to_remove:
             field.parent.remove(field)
+
+
+def _list_name_from_thread(node: nodes.reference) -> nodes.raw:
+    # mailman structure is
+    # https://mail.python.org/archives/list/<list name>/thread/<id>
+    # pipermail structure is
+    # https://mail.python.org/pipermail/<list name>/<month-year>/<id>
+    parts = node[0].split("/")
+    try:
+        list_name = parts[parts.index("archives") + 2]
+        masked_name = list_name.replace("@", "&#32;&#97;t&#32;")
+    except ValueError:
+        try:
+            list_name = parts[parts.index("pipermail") + 1]
+            masked_name = list_name + "&#32;&#97;t&#32;python.org"
+        except ValueError:
+            # archives and pipermail not in list, e.g. PEP 245
+            return node[0]
+    return nodes.raw("", masked_name, format="html")

pep_sphinx_extensions/pep_processor/transforms/pep_zero.py

@@ -74,23 +74,20 @@ def visit_entry(self, node: nodes.entry) -> None:
                 para[0] = nodes.reference("", pep_str, refuri=ref)
 
 
-def _mask_email(ref: nodes.reference, pep_num: int | None = None) -> nodes.reference:
+def _mask_email(ref: nodes.reference) -> nodes.reference:
     """Mask the email address in `ref` and return a replacement node.
 
     `ref` is returned unchanged if it contains no email address.
 
     If given an email not explicitly whitelisted, process it such that
     `user@host` -> `user at host`.
 
-    If given a PEP number `pep_num`, add a default email subject.
+    The returned node has no refuri link attribute.
 
     """
     if "refuri" not in ref or not ref["refuri"].startswith("mailto:"):
         return ref
-    non_masked_addresses = {"[email protected]", "[email protected]", "[email protected]"}
-    if ref["refuri"].removeprefix("mailto:").strip() not in non_masked_addresses:
-        ref[0] = nodes.raw("", ref[0].replace("@", " at "), format="html")
-    if pep_num is None:
-        return ref[0]  # return email text without mailto link
-    ref["refuri"] += f"?subject=PEP%20{pep_num}"
-    return ref
+    list_name = ref["refuri"].removeprefix("mailto:").strip()
+    if list_name in {"[email protected]", "[email protected]", "[email protected]"}:
+        return ref[0]
+    return nodes.raw("", ref[0].replace("@", " at "), format="html")