Feat: hide double underscored symbols from symbol search

crates/ide-db/src/symbol_index.rs

@@ -53,6 +53,7 @@ pub struct Query {
     case_sensitive: bool,
     only_types: bool,
     libs: bool,
+    include_hidden: bool,
 }
 
 impl Query {
@@ -66,9 +67,14 @@ impl Query {
             mode: SearchMode::Fuzzy,
             assoc_mode: AssocSearchMode::Include,
             case_sensitive: false,
+            include_hidden: false,
         }
     }
 
+    pub fn include_hidden(&mut self) {
+        self.include_hidden = true;
+    }
+
     pub fn only_types(&mut self) {
         self.only_types = true;
     }
@@ -192,7 +198,8 @@ impl<DB> std::ops::Deref for Snap<DB> {
 // Note that filtering does not currently work in VSCode due to the editor never
 // sending the special symbols to the language server. Instead, you can configure
 // the filtering via the `rust-analyzer.workspace.symbol.search.scope` and
-// `rust-analyzer.workspace.symbol.search.kind` settings.
+// `rust-analyzer.workspace.symbol.search.kind` settings. Symbols prefixed
+// with `__` are hidden from the search results unless configured otherwise.
 //
 // |===
 // | Editor  | Shortcut
@@ -374,6 +381,9 @@ impl Query {
                     if non_type_for_type_only_query || !self.matches_assoc_mode(symbol.is_assoc) {
                         continue;
                     }
+                    if self.should_hide_query(symbol) {
+                        continue;
+                    }
                     if self.mode.check(&self.query, self.case_sensitive, &symbol.name) {
                         cb(symbol);
                     }
@@ -382,6 +392,11 @@ impl Query {
         }
     }
 
+    fn should_hide_query(&self, symbol: &FileSymbol) -> bool {
+        // Hide symbols that start with `__` unless the query starts with `__`
+        !self.include_hidden && symbol.name.starts_with("__") && !self.query.starts_with("__")
+    }
+
     fn matches_assoc_mode(&self, is_trait_assoc_item: bool) -> bool {
         !matches!(
             (is_trait_assoc_item, self.assoc_mode),

crates/ide/src/navigation_target.rs

@@ -926,4 +926,25 @@ struct Foo;
         let navs = analysis.symbol_search(Query::new("foo".to_owned()), !0).unwrap();
         assert_eq!(navs.len(), 2)
     }
+
+    #[test]
+    fn test_ensure_hidden_symbols_are_not_returned() {
+        let (analysis, _) = fixture::file(
+            r#"
+fn foo() {}
+struct Foo;
+static __FOO_CALLSITE: () = ();
+"#,
+        );
+
+        // It doesn't show the hidden symbol
+        let navs = analysis.symbol_search(Query::new("foo".to_owned()), !0).unwrap();
+        assert_eq!(navs.len(), 2);
+
+        // Unless we configure a query to show hidden symbols
+        let mut query = Query::new("foo".to_owned());
+        query.include_hidden();
+        let navs = analysis.symbol_search(query, !0).unwrap();
+        assert_eq!(navs.len(), 3);
+    }
 }