Function callback

src/pkg/utils/file-tracker.ts:27–67

(records: FileSystemChangeRecord[], observer: FileSystemObserverInstance)

};

const callback = async (records: FileSystemChangeRecord[], observer: FileSystemObserverInstance) => {
  try {
    for (const record of records) {
      const { root, type } = record;
      if (!(root instanceof FileSystemFileHandle)) continue;
      // 只要 FileSystemObserver 侦测到档案改变，就试一下找记录和读档
      const ftInfo = await getHandleRecord(root, observer);
      // 如没有记录则忽略
      if (!ftInfo) continue;
      let file: File | null = null;
      try {
        const fRead = await root.getFile();
        if (fRead && fRead.lastModified > 0 && fRead.size > 0) {
          // 有档案内容读取权限，排除空档案
          file = fRead;
        }
      } catch (e) {
        // 档案改名或删掉时，或会被此捕捉（预期报错）
        console.warn(e);
        unmountFileTrack(root);
        ftInfo.onFileError();
      }
      // 如读档失败则忽略
      if (!file) continue;
      // 如成功读档但显示为失败，则重新 observe
      if (type === "errored") {
        observer.observe(root);
      }
      // 以 lastModified 判断避免重复更新
      if (ftInfo.lastModified === file.lastModified) continue;
      ftInfo.lastModified = file.lastModified;
      const code = await file.text();
      if (code && typeof code === "string") {
        ftInfo.setCode(code, false);
      }
    }
  } catch (e) {
    // 捕捉非预期错误
    console.warn(e);
  }
};

export const startFileTrack = (fileHandle: FileSystemFileHandle, ftInfo: FTInfo) => {
  const fileObserver = new FileSystemObserver(callback);