feat: Show model thoughts while loading (#992)

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -21,6 +21,7 @@ import {
   logUserPrompt,
   GitService,
   EditorType,
+  ThoughtSummary,
 } from '@gemini-cli/core';
 import { type Part, type PartListUnion } from '@google/genai';
 import {
@@ -90,6 +91,7 @@ export const useGeminiStream = (
   const [initError, setInitError] = useState<string | null>(null);
   const abortControllerRef = useRef<AbortController | null>(null);
   const [isResponding, setIsResponding] = useState<boolean>(false);
+  const [thought, setThought] = useState<ThoughtSummary | null>(null);
   const [pendingHistoryItemRef, setPendingHistoryItem] =
     useStateAndRef<HistoryItemWithoutId | null>(null);
   const logger = useLogger();
@@ -393,6 +395,9 @@ export const useGeminiStream = (
       const toolCallRequests: ToolCallRequestInfo[] = [];
       for await (const event of stream) {
         switch (event.type) {
+          case ServerGeminiEventType.Thought:
+            setThought(event.value);
+            break;
           case ServerGeminiEventType.Content:
             geminiMessageBuffer = handleContentEvent(
               event.value,
@@ -730,5 +735,6 @@ export const useGeminiStream = (
     submitQuery,
     initError,
     pendingHistoryItems,
+    thought,
   };
 };