Check language server symbol renaming support before prompting (#6257)

Co-authored-by: Poliorcetics <poliorcetics@users.noreply.github.com>

helix-lsp/src/client.rs

@@ -1136,20 +1136,23 @@ impl Client {
         Some(self.call::<lsp::request::CodeActionRequest>(params))
     }
 
+    pub fn supports_rename(&self) -> bool {
+        let capabilities = self.capabilities.get().unwrap();
+        matches!(
+            capabilities.rename_provider,
+            Some(lsp::OneOf::Left(true) | lsp::OneOf::Right(_))
+        )
+    }
+
     pub fn rename_symbol(
         &self,
         text_document: lsp::TextDocumentIdentifier,
         position: lsp::Position,
         new_name: String,
     ) -> Option<impl Future<Output = Result<lsp::WorkspaceEdit>>> {
-        let capabilities = self.capabilities.get().unwrap();
-
-        // Return early if the language server does not support renaming.
-        match capabilities.rename_provider {
-            Some(lsp::OneOf::Left(true)) | Some(lsp::OneOf::Right(_)) => (),
-            // None | Some(false)
-            _ => return None,
-        };
+        if !self.supports_rename() {
+            return None;
+        }
 
         let params = lsp::RenameParams {
             text_document_position: lsp::TextDocumentPositionParams {

helix-term/src/commands/lsp.rs

@@ -1316,6 +1316,12 @@ pub fn rename_symbol(cx: &mut Context) {
     let language_server = language_server!(cx.editor, doc);
     let offset_encoding = language_server.offset_encoding();
 
+    if !language_server.supports_rename() {
+        cx.editor
+            .set_error("Language server does not support symbol renaming");
+        return;
+    }
+
     let pos = doc.position(view.id, offset_encoding);
 
     match language_server.prepare_rename(doc.identifier(), pos) {