Adding some wiring to allow the Ink app to warn if there are local development changes that haven't been captured in the recent build of the Gemini CLI.

package.json

@@ -9,7 +9,7 @@
   "scripts": {
     "build": "npm run build --workspaces",
     "test": "npm run test --workspaces",
-    "start": "npm run start --workspace=gemini-code-cli -- \"$@\"",
+    "start": "node ./scripts/check-build-status.js && npm run start --workspace=gemini-code-cli -- \"$@\"",
     "lint": "eslint .",
     "format": "prettier --write ."
   },

packages/cli/package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "main": "dist/gemini.js",
   "scripts": {
-    "build": "tsc",
+    "build": "tsc && touch dist/.last_build",
     "start": "node dist/gemini.js",
     "debug": "node --inspect-brk dist/gemini.js",
     "lint": "eslint . --ext .ts,.tsx",

packages/cli/src/core/gemini-client.ts

@@ -9,7 +9,7 @@ import {
   Content,
 } from '@google/genai';
 import { getApiKey } from '../config/env.js';
-import { getModel } from '../config/globalConfig.js';
+import { getModel } from '../config/globalConfig.js';  
 import { CoreSystemPrompt } from './prompts.js';
 import {
   type ToolCallEvent,

packages/cli/src/ui/App.tsx

@@ -1,5 +1,8 @@
 import React, { useState, useEffect } from 'react';
 import { Box, Text } from 'ink';
+import fs from 'fs';
+import path from 'path';
+import os from 'os';
 import type { HistoryItem } from './types.js';
 import { useGeminiStream } from './hooks/useGeminiStream.js';
 import { useLoadingIndicator } from './hooks/useLoadingIndicator.js';
@@ -12,6 +15,8 @@ import Footer from './components/Footer.js';
 import { StreamingState } from '../core/gemini-stream.js';
 import { PartListUnion } from '@google/genai';
 
+const warningsFilePath = path.join(os.tmpdir(), 'gemini-code-cli-warnings.txt');
+
 interface AppProps {
   directory: string;
 }
@@ -19,11 +24,31 @@ interface AppProps {
 const App = ({ directory }: AppProps) => {
   const [query, setQuery] = useState('');
   const [history, setHistory] = useState<HistoryItem[]>([]);
+  const [startupWarnings, setStartupWarnings] = useState<string[]>([]);
   const { streamingState, submitQuery, initError } =
     useGeminiStream(setHistory);
   const { elapsedTime, currentLoadingPhrase } =
     useLoadingIndicator(streamingState);
 
+  useEffect(() => {
+    try {
+      if (fs.existsSync(warningsFilePath)) {
+        console.log('[App] Found warnings file:', warningsFilePath);
+        const warningsContent = fs.readFileSync(warningsFilePath, 'utf-8');
+        setStartupWarnings(warningsContent.split('\n').filter(line => line.trim() !== ''));
+        try {
+            fs.unlinkSync(warningsFilePath);
+        } catch (unlinkErr: any) {
+             console.warn(`[App] Warning: Could not delete warnings file: ${unlinkErr.message}`);
+        }
+      } else {
+         console.log('[App] No warnings file found.');
+      }
+    } catch (err: any) {
+      console.error(`[App] Error checking/reading warnings file: ${err.message}`);
+    }
+  }, []);
+
   const handleInputSubmit = (value: PartListUnion) => {
     submitQuery(value)
       .then(() => {
@@ -63,6 +88,22 @@ const App = ({ directory }: AppProps) => {
     <Box flexDirection="column" padding={1} marginBottom={1} width="100%">
       <Header cwd={directory} />
 
+      {startupWarnings.length > 0 && (
+        <Box
+          borderStyle="round"
+          borderColor="yellow"
+          paddingX={1}
+          marginY={1}
+          flexDirection="column"
+        >
+          {startupWarnings.map((warning, index) => (
+            <Text key={index} color="yellow">
+              {warning}
+            </Text>
+          ))}
+        </Box>
+      )}
+
       <Tips />
 
       {initError &&

scripts/check-build-status.js

@@ -0,0 +1,129 @@
+import fs from 'fs';
+import path from 'path';
+import os from 'os'; // Import os module
+
+// --- Configuration ---
+const cliPackageDir = path.resolve('packages', 'cli'); // Base directory for the CLI package
+const buildTimestampPath = path.join(cliPackageDir, 'dist', '.last_build'); // Path to the timestamp file within the CLI package
+const sourceDirs = [path.join(cliPackageDir, 'src')]; // Source directory within the CLI package
+const filesToWatch = [path.join(cliPackageDir, 'package.json'), path.join(cliPackageDir, 'tsconfig.json')]; // Specific files within the CLI package
+const buildDir = path.join(cliPackageDir, 'dist'); // Build output directory within the CLI package
+const warningsFilePath = path.join(os.tmpdir(), 'gemini-code-cli-warnings.txt'); // Temp file for warnings
+// ---------------------
+
+function getMtime(filePath) {
+  try {
+    return fs.statSync(filePath).mtimeMs; // Use mtimeMs for higher precision
+  } catch (err) {
+    if (err.code === 'ENOENT') {
+      return null; // File doesn't exist
+    }
+    console.error(`Error getting stats for ${filePath}:`, err);
+    process.exit(1); // Exit on unexpected errors getting stats
+  }
+}
+
+function findSourceFiles(dir, allFiles = []) {
+  const entries = fs.readdirSync(dir, { withFileTypes: true });
+  for (const entry of entries) {
+    const fullPath = path.join(dir, entry.name);
+    // Simple check to avoid recursing into node_modules or build dir itself
+    if (entry.isDirectory() && entry.name !== 'node_modules' && fullPath !== buildDir) {
+      findSourceFiles(fullPath, allFiles);
+    } else if (entry.isFile()) {
+      allFiles.push(fullPath);
+    }
+  }
+  return allFiles;
+}
+
+console.log('Checking build status...');
+
+// Clean up old warnings file before check
+try {
+  if (fs.existsSync(warningsFilePath)) {
+    fs.unlinkSync(warningsFilePath);
+  }
+} catch (err) {
+  console.warn(`[Check Script] Warning: Could not delete previous warnings file: ${err.message}`);
+}
+
+const buildMtime = getMtime(buildTimestampPath);
+if (!buildMtime) {
+  // If build is missing, write that as a warning and exit(0) so app can display it
+  const errorMessage = `ERROR: Build timestamp file (${path.relative(process.cwd(), buildTimestampPath)}) not found. Run \`npm run build\` first.`;
+  console.error(errorMessage); // Still log error here
+  try {
+    fs.writeFileSync(warningsFilePath, errorMessage);
+  } catch (writeErr) {
+     console.error(`[Check Script] Error writing missing build warning file: ${writeErr.message}`);
+  }
+  process.exit(0); // Allow app to start and show the error
+}
+
+let newerSourceFileFound = false;
+const warningMessages = []; // Collect warnings here
+const allSourceFiles = [];
+
+// Collect files from specified directories
+sourceDirs.forEach((dir) => {
+    const dirPath = path.resolve(dir);
+    if (fs.existsSync(dirPath)) {
+        findSourceFiles(dirPath, allSourceFiles);
+    } else {
+        console.warn(`Warning: Source directory "${dir}" not found.`);
+    }
+});
+
+// Add specific files
+filesToWatch.forEach((file) => {
+    const filePath = path.resolve(file);
+     if (fs.existsSync(filePath)) {
+        allSourceFiles.push(filePath);
+    } else {
+         console.warn(`Warning: Watched file "${file}" not found.`);
+    }
+});
+
+
+// Check modification times
+for (const file of allSourceFiles) {
+  const sourceMtime = getMtime(file);
+  const relativePath = path.relative(process.cwd(), file);
+  const isNewer = sourceMtime && sourceMtime > buildMtime;
+
+  if (isNewer) {
+    const warning = `Warning: Source file "${relativePath}" has been modified since the last build.`;
+    console.warn(warning); // Keep console warning for script debugging
+    warningMessages.push(warning);
+    newerSourceFileFound = true;
+    // break; // Uncomment to stop checking after the first newer file
+  }
+}
+
+if (newerSourceFileFound) {
+  const finalWarning = '\nRun "npm run build" to incorporate changes before starting.';
+  warningMessages.push(finalWarning);
+  console.warn(finalWarning);
+
+  // Write warnings to the temp file
+  try {
+    fs.writeFileSync(warningsFilePath, warningMessages.join('\n'));
+    // Removed debug log
+  } catch (err) {
+    console.error(`[Check Script] Error writing warnings file: ${err.message}`);
+    // Proceed without writing, app won't show warnings
+  }
+} else {
+  console.log('Build is up-to-date.');
+  // Ensure no stale warning file exists if build is ok
+  try {
+      if (fs.existsSync(warningsFilePath)) {
+          fs.unlinkSync(warningsFilePath);
+      }
+  } catch (err) {
+       console.warn(`[Check Script] Warning: Could not delete previous warnings file: ${err.message}`);
+  }
+}
+
+process.exit(0); // Always exit successfully so the app starts