feat: allow clients to feature detect symbol filtering

crates/rust-analyzer/src/caps.rs

@@ -122,6 +122,7 @@ pub fn server_capabilities(client_caps: &ClientCapabilities) -> ServerCapabiliti
             "runnables": {
                 "kinds": [ "cargo" ],
             },
+            "workspaceSymbolScopeKindFiltering": true,
         })),
     }
 }

docs/dev/lsp-extensions.md

@@ -651,32 +651,36 @@ export const enum Direction {
 }
 ```
 
-## Lookup workspace symbol search scope and kind
+## Workspace Symbols Filtering
 
 **Issue:** https://github.com/rust-analyzer/rust-analyzer/pull/7698
 
-This request is sent from client to server to search for workspace symbols filtered by an
+**Experimental Server Capability:** `{ "workspaceSymbolScopeKindFiltering": boolean }`
-optional search scope and / or an optional symbol kind.
 
-**Method:** `workspace/symbol`
+Extends the existing `workspace/symbol` request with ability to filter symbols by broad scope and kind of symbol.
+If this capability is set, `workspace/symbol` parameter gains two new optional fields:
 
-**Request:** `WorkspaceSymbolParams`
-
-**Response:** `SymbolInformation[] | null`
 
 ```typescript
-interface lsp_ext.WorkspaceSymbolParams extends WorkspaceSymbolParams {
+interface WorkspaceSymbolParams {
+    /**
+     * Return only the symbols defined in the specified scope.
+     */
     searchScope?: WorkspaceSymbolSearchScope;
+    /**
+     * Return only the symbols of specified kinds.
+     */
     searchKind?: WorkspaceSymbolSearchKind;
+    ...
 }
 
 const enum WorkspaceSymbolSearchScope {
-    Workspace = "Workspace",
+    Workspace = "workspace",
-    WorkspaceAndDependencies = "WorkspaceAndDependencies"
+    WorkspaceAndDependencies = "workspaceAndDependencies"
 }
 
 const enum WorkspaceSymbolSearchKind {
-    OnlyTypes = "OnlyTypes",
+    OnlyTypes = "onlyTypes",
-    AllSymbols = "AllSymbols"
+    AllSymbols = "allSymbols"
 }
 ```