node非回调同步遍历目录读取文件

记录，用于cv

var fs = require('fs');
const events = require('events');
var path = require('path');
const readline = require('readline');
init();
function init() {
  //要遍历的文件夹所在的路径
  const dirPath = path.resolve(__dirname, "data");
  //遍历目录
  fileDisplay(dirPath);
}
/**
 * 文件遍历
 * @param dirPath 需要遍历的文件路径
 */
 async function fileDisplay(dirPath) {
  //根据文件路径读取文件，返回文件列表
  let fileNameArr = fs.readdirSync(dirPath);
  //拼接
  const pathArr = fileNameArr.map(filename=> {
    return path.join(dirPath, filename);
  });
  while(pathArr.length>0) {
    //取首端元素 并删除
    let thePath = pathArr.shift();
    //根据文件路径获取文件信息，返回一个fs.Stats对象
    let stats = fs.statSync(thePath);
    if (stats.isFile()) {
      console.log(thePath);
      // let extName = path.extname(thePath).toLocaleLowerCase();
      // if (extName === ".txt") {
      //   //处理
      //   console.log(`开始处理文件${thePath}`);
      //   await readFileByLine(thePath);
      //   console.log(`完成处理文件${thePath}`);
      // }
    }
    if (stats.isDirectory()) {
      fileNameArr = fs.readdirSync(thePath);
      let theSonPathArr = fileNameArr.map(filename=> {
        return path.join(thePath, filename);
      });
      //将目录加入数组
      pathArr.push(...theSonPathArr);
    }
  }
}
function readFileByLine(fileLocation) {
  return new Promise(async (resolve) => {
    const fileStream = fs.createReadStream(fileLocation);
    const rl = readline.createInterface({
      input: fileStream,
      crlfDelay: Infinity,
    });
    rl.on('line', (line) => {
      console.log(`Line from file: ${line}`);
    });
    await events.once(rl, 'close');
    
    resolve(fileLocation + "success");
  })
}