feat(sessions): add resuming to geminiChat and add CLI flags for session management (#10719)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/cli/src/nonInteractiveCli.ts

@@ -7,6 +7,7 @@
 import type {
   Config,
   ToolCallRequestInfo,
+  ResumedSessionData,
   CompletedToolCall,
   UserFeedbackPayload,
 } from '@google/gemini-cli-core';
@@ -32,6 +33,7 @@ import {
 import type { Content, Part } from '@google/genai';
 import readline from 'node:readline';
 
+import { convertSessionToHistoryFormats } from './ui/hooks/useSessionBrowser.js';
 import { handleSlashCommand } from './nonInteractiveCliCommands.js';
 import { ConsolePatcher } from './ui/utils/ConsolePatcher.js';
 import { handleAtCommand } from './ui/hooks/atCommandProcessor.js';
@@ -49,6 +51,7 @@ interface RunNonInteractiveParams {
   input: string;
   prompt_id: string;
   hasDeprecatedPromptArg?: boolean;
+  resumedSessionData?: ResumedSessionData;
 }
 
 export async function runNonInteractive({
@@ -57,6 +60,7 @@ export async function runNonInteractive({
   input,
   prompt_id,
   hasDeprecatedPromptArg,
+  resumedSessionData,
 }: RunNonInteractiveParams): Promise<void> {
   return promptIdContext.run(prompt_id, async () => {
     const consolePatcher = new ConsolePatcher({
@@ -185,6 +189,16 @@ export async function runNonInteractive({
 
       const geminiClient = config.getGeminiClient();
 
+      // Initialize chat.  Resume if resume data is passed.
+      if (resumedSessionData) {
+        await geminiClient.resumeChat(
+          convertSessionToHistoryFormats(
+            resumedSessionData.conversation.messages,
+          ).clientHistory,
+          resumedSessionData,
+        );
+      }
+
       // Emit init event for streaming JSON
       if (streamFormatter) {
         streamFormatter.emitEvent({