Add backend filter for field name

pylib/anki/collection.py

@@ -505,6 +505,7 @@ class Collection:
         added_in: Optional[int] = None,
         due_in: Optional[int] = None,
         nids: Optional[List[int]] = None,
+        field_name: Optional[str] = None,
     ) -> str:
         filters = searches or []
 
@@ -532,6 +533,8 @@ class Collection:
             append_filter(FilterToSearchIn(due_in=due_in))
         if nids:
             append_filter(FilterToSearchIn(nids=NoteIDs(nids=nids)))
+        if field_name:
+            append_filter(FilterToSearchIn(field_name=field_name))
         if concat_by_or:
             sep = ConcatSeparator.OR
         else:

rslib/backend.proto

@@ -802,6 +802,7 @@ message FilterToSearchIn {
     // will be due in the next x days
     int32 due_in = 9;
     NoteIDs nids = 10;
+    string field_name = 11;
   }
 }
 

rslib/src/backend/mod.rs

@@ -351,6 +351,11 @@ impl From<pb::FilterToSearchIn> for Node<'_> {
                 kind: PropertyKind::Due(i),
             }),
             Filter::Nids(nids) => Node::Search(SearchNode::NoteIDs(nids.into_id_string().into())),
+            Filter::FieldName(s) => Node::Search(SearchNode::SingleField {
+                field: escape_anki_wildcards(&s).into_owned().into(),
+                text: "*".to_string().into(),
+                is_re: false,
+            }),
         }
     }
 }