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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { useState, useEffect, useCallback } from 'react';
import * as fs from 'fs/promises';
import * as path from 'path';
import { isNodeError, getProjectTempDir } from '@google/gemini-cli-core';
const HISTORY_FILE = 'shell_history';
const MAX_HISTORY_LENGTH = 100;
export interface UseShellHistoryReturn {
history: string[];
addCommandToHistory: (command: string) => void;
getPreviousCommand: () => string | null;
getNextCommand: () => string | null;
resetHistoryPosition: () => void;
}
async function getHistoryFilePath(projectRoot: string): Promise<string> {
const historyDir = getProjectTempDir(projectRoot);
return path.join(historyDir, HISTORY_FILE);
}
// Handle multiline commands
async function readHistoryFile(filePath: string): Promise<string[]> {
try {
const text = await fs.readFile(filePath, 'utf-8');
const result: string[] = [];
let cur = '';
for (const raw of text.split(/\r?\n/)) {
if (!raw.trim()) continue;
const line = raw;
const m = cur.match(/(\\+)$/);
if (m && m[1].length % 2) {
// odd number of trailing '\'
cur = cur.slice(0, -1) + ' ' + line;
} else {
if (cur) result.push(cur);
cur = line;
}
}
if (cur) result.push(cur);
return result;
} catch (err) {
if (isNodeError(err) && err.code === 'ENOENT') return [];
console.error('Error reading history:', err);
return [];
}
}
async function writeHistoryFile(
filePath: string,
history: string[],
): Promise<void> {
try {
await fs.mkdir(path.dirname(filePath), { recursive: true });
await fs.writeFile(filePath, history.join('\n'));
} catch (error) {
console.error('Error writing shell history:', error);
}
}
export function useShellHistory(projectRoot: string): UseShellHistoryReturn {
const [history, setHistory] = useState<string[]>([]);
const [historyIndex, setHistoryIndex] = useState(-1);
const [historyFilePath, setHistoryFilePath] = useState<string | null>(null);
useEffect(() => {
async function loadHistory() {
const filePath = await getHistoryFilePath(projectRoot);
setHistoryFilePath(filePath);
const loadedHistory = await readHistoryFile(filePath);
setHistory(loadedHistory.reverse()); // Newest first
}
loadHistory();
}, [projectRoot]);
const addCommandToHistory = useCallback(
(command: string) => {
if (!command.trim() || !historyFilePath) {
return;
}
const newHistory = [command, ...history.filter((c) => c !== command)]
.slice(0, MAX_HISTORY_LENGTH)
.filter(Boolean);
setHistory(newHistory);
// Write to file in reverse order (oldest first)
writeHistoryFile(historyFilePath, [...newHistory].reverse());
setHistoryIndex(-1);
},
[history, historyFilePath],
);
const getPreviousCommand = useCallback(() => {
if (history.length === 0) {
return null;
}
const newIndex = Math.min(historyIndex + 1, history.length - 1);
setHistoryIndex(newIndex);
return history[newIndex] ?? null;
}, [history, historyIndex]);
const getNextCommand = useCallback(() => {
if (historyIndex < 0) {
return null;
}
const newIndex = historyIndex - 1;
setHistoryIndex(newIndex);
if (newIndex < 0) {
return '';
}
return history[newIndex] ?? null;
}, [history, historyIndex]);
const resetHistoryPosition = useCallback(() => {
setHistoryIndex(-1);
}, []);
return {
history,
addCommandToHistory,
getPreviousCommand,
getNextCommand,
resetHistoryPosition,
};
}
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