ai-diff-preview/scripts/hook-trigger.js

#!/usr/bin/env node
/**
 * Claude Code PostToolUse Hook 脚本
 *
 * 当 Claude Code 执行 Write 或 Edit 工具后，此脚本被调用。
 * 它从 stdin 读取 JSON，将事件写入触发文件，供 VSCode 扩展监听。
 *
 * stdin JSON 格式:
 * {
 *   "session_id": "abc123",
 *   "tool_name": "Write" | "Edit",
 *   "tool_input": { "file_path": "...", "content": "..." },
 *   "tool_response": { "success": true }
 * }
 */

const fs = require('fs');
const path = require('path');

// 触发文件目录 - VSCode 扩展会监听此目录
const TRIGGER_DIR = path.join(__dirname, '..', '.claude', 'hooks');
const TRIGGER_FILE = path.join(TRIGGER_DIR, 'pending.json');

async function main() {
  // 读取 stdin
  const chunks = [];
  for await (const chunk of process.stdin) {
    chunks.push(chunk);
  }
  const input = Buffer.concat(chunks).toString('utf-8');

  let data;
  try {
    data = JSON.parse(input);
  } catch (e) {
    // 非 JSON 输入，忽略
    process.exit(0);
  }

  const { tool_name, tool_input, tool_response } = data;

  // 只处理成功的 Write/Edit 操作
  if (!tool_response || tool_response.error) {
    process.exit(0);
  }

  const filePath = tool_input?.file_path || tool_response?.filePath;
  if (!filePath) {
    process.exit(0);
  }

  // 构造事件数据
  const event = {
    type: tool_name === 'Write' ? 'after_write_file' : 'after_code_edit',
    filePath: filePath,
    content: tool_input?.content || '',
    patch: tool_input?.new_content || tool_input?.content || '',
    oldString: tool_input?.old_string || '',
    newString: tool_input?.new_string || '',
    timestamp: Date.now(),
    toolName: tool_name,
  };

  // 确保目录存在
  if (!fs.existsSync(TRIGGER_DIR)) {
    fs.mkdirSync(TRIGGER_DIR, { recursive: true });
  }

  // 写入触发文件（原子写入：先写临时文件再重命名）
  const tmpFile = TRIGGER_FILE + '.tmp';
  fs.writeFileSync(tmpFile, JSON.stringify(event, null, 2), 'utf-8');
  fs.renameSync(tmpFile, TRIGGER_FILE);
}

main().catch(() => {
  // 静默失败，不阻塞 Claude Code
  process.exit(0);
});