Added bang(!) commands as a shell passthrough

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

@@ -0,0 +1,93 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { exec as _exec } from 'child_process';
+import { useCallback } from 'react';
+import { Config } from '@gemini-code/server';
+import { type PartListUnion } from '@google/genai';
+import { HistoryItem, StreamingState } from '../types.js';
+import { getCommandFromQuery } from '../utils/commandUtils.js';
+
+// Helper function (consider moving to a shared util if used elsewhere)
+const addHistoryItem = (
+  setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>,
+  itemData: Omit<HistoryItem, 'id'>,
+  id: number,
+) => {
+  setHistory((prevHistory) => [
+    ...prevHistory,
+    { ...itemData, id } as HistoryItem,
+  ]);
+};
+
+export const useShellCommandProcessor = (
+  setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>,
+  setStreamingState: React.Dispatch<React.SetStateAction<StreamingState>>,
+  setDebugMessage: React.Dispatch<React.SetStateAction<string>>,
+  getNextMessageId: (baseTimestamp: number) => number,
+  config: Config,
+) => {
+  const handleShellCommand = useCallback(
+    (rawQuery: PartListUnion): boolean => {
+      if (typeof rawQuery !== 'string') {
+        return false; // Passthrough only works with string commands
+      }
+
+      const [symbol] = getCommandFromQuery(rawQuery);
+      if (symbol !== '!' && symbol !== '$') {
+        return false;
+      }
+      // Remove symbol from rawQuery
+      const trimmed = rawQuery.trim().slice(1);
+
+      // Add user message *before* execution starts
+      const userMessageTimestamp = Date.now();
+      addHistoryItem(
+        setHistory,
+        { type: 'user', text: rawQuery },
+        userMessageTimestamp,
+      );
+
+      // Execute and capture output
+      const targetDir = config.getTargetDir();
+      setDebugMessage(`Executing shell command in ${targetDir}: ${trimmed}`);
+      const execOptions = {
+        cwd: targetDir,
+      };
+
+      // Set state to Responding while the command runs
+      setStreamingState(StreamingState.Responding);
+
+      _exec(trimmed, execOptions, (error, stdout, stderr) => {
+        const timestamp = getNextMessageId(userMessageTimestamp); // Use user message time as base
+        if (error) {
+          addHistoryItem(
+            setHistory,
+            { type: 'error', text: error.message },
+            timestamp,
+          );
+        } else if (stderr) {
+          // Treat stderr as info for passthrough, as some tools use it for non-error output
+          addHistoryItem(setHistory, { type: 'info', text: stderr }, timestamp);
+        } else {
+          // Add stdout as an info message
+          addHistoryItem(
+            setHistory,
+            { type: 'info', text: stdout || '(Command produced no output)' },
+            timestamp,
+          );
+        }
+        // Set state back to Idle *after* command finishes and output is added
+        setStreamingState(StreamingState.Idle);
+      });
+
+      return true; // Command was handled
+    },
+    [config, setDebugMessage, setHistory, setStreamingState, getNextMessageId],
+  );
+
+  return { handleShellCommand };
+};