chore(lsp): check rename capabilities before send rename action (#2203)

helix-lsp/src/client.rs

@@ -3,6 +3,7 @@ use crate::{
     Call, Error, OffsetEncoding, Result,
 };
 
+use anyhow::anyhow;
 use helix_core::{find_root, ChangeSet, Rope};
 use jsonrpc_core as jsonrpc;
 use lsp_types as lsp;
@@ -861,6 +862,19 @@ impl Client {
         position: lsp::Position,
         new_name: String,
     ) -> anyhow::Result<lsp::WorkspaceEdit> {
+        let capabilities = self.capabilities.get().unwrap();
+
+        // check if we're able to rename
+        match capabilities.rename_provider {
+            Some(lsp::OneOf::Left(true)) | Some(lsp::OneOf::Right(_)) => (),
+            // None | Some(false)
+            _ => {
+                let err = "The server does not support rename";
+                log::warn!("rename_symbol failed: {}", err);
+                return Err(anyhow!(err));
+            }
+        };
+
         let params = lsp::RenameParams {
             text_document_position: lsp::TextDocumentPositionParams {
                 text_document,

helix-term/src/commands/lsp.rs

@@ -674,8 +674,10 @@ pub fn rename_symbol(cx: &mut Context) {
             let pos = doc.position(view.id, offset_encoding);
 
             let task = language_server.rename_symbol(doc.identifier(), pos, input.to_string());
-            let edits = block_on(task).unwrap_or_default();
+            match block_on(task) {
-            apply_workspace_edit(cx.editor, offset_encoding, &edits);
+                Ok(edits) => apply_workspace_edit(cx.editor, offset_encoding, &edits),
+                Err(err) => cx.editor.set_error(err.to_string()),
+            }
         },
     );
 }