Re-implement status display using LSP 3.15 progress event

editors/code/src/commands/watch_status.ts

@@ -57,7 +57,50 @@ export class StatusDisplay implements vscode.Disposable {
         this.statusBarItem.dispose();
     }
 
+    public handleProgressNotification(params: ProgressParams) {
+        const { token, value } = params;
+        if (token !== "rustAnalyzer/cargoWatcher") {
+            return;
+        }
+
+        console.log("Got progress notification", token, value)
+        switch (value.kind) {
+            case "begin":
+                this.show();
+                break;
+
+            case "report":
+                if (value.message) {
+                    this.packageName = value.message;
+                }
+                break;
+
+            case "end":
+                this.hide();
+                break;
+        }
+    }
+
     private frame() {
         return spinnerFrames[(this.i = ++this.i % spinnerFrames.length)];
     }
 }
+
+// FIXME: Replace this once vscode-languageclient is updated to LSP 3.15
+interface ProgressParams {
+    token: string
+    value: WorkDoneProgress
+}
+
+enum WorkDoneProgressKind {
+    Begin = "begin",
+    Report = "report",
+    End = "end"
+}
+
+interface WorkDoneProgress {
+    kind: WorkDoneProgressKind,
+    message?: string
+    cancelable?: boolean
+    percentage?: string
+}