ExFile

ExFile is a extendable file wraper in browser.

It extends native file and provide way to install plugins, but ExFile won't provide any feature it self.

Install

npm i -S @ex-file/ex-file
yarn add @ex-file/ex-file

Usage

Create ExFile like a native file, or create ExFile by pass a native file. and ExFile works just like native file.

import ExFile from '@ex-file/ex-file';

const exFile1 = new ExFile(['string'], 'filename.txt', {
  lastModified: 1188489600000
});
const nativeFile = new File(['string'], 'filename.txt', {
  lastModified: 1188489600000
});
const exFile2 = new ExFile(nativeFile);

// exFile1.size === nativeFile.size === exFile2.size
// exFile1.name === nativeFile.name === exFile2.name

Write a plugin for ExFile

A plugin is a object with property 'name', which contains a string, it should be same as the package name. and ExFile plugin should implements 'install' method, when plugin install to exfile, the method will be call and pass ExFile class.

import ExFile from '@ex-file/ex-file';

const plugin = {
  name: 'ex-file-is-modified-today',
  install(E) {
    E.prototype.isModifiedToday = function() {
      const currentDay = new Date();
      const modifiedDate = new Date(this.lastModified);
      return (
        currentDay.getFullYear() === modifiedDate.getFullYear() &&
        currentDay.getMonth() === modifiedDate.getMonth() &&
        currentDay.getDate() === modifiedDate.getDate()
      );
    };
  }
};

ExFile.use(plugin);

const today = new Date();
const todayFile = new YukineFile(['yukine'], 'yukine.txt', {
  lastModified: today.getTime()
});
todayFile.isModifiedToday();
// => true

const yestoday = new Date();
yestoday.setDate(yestoday.getDate() - 1);
const yestodayFile = new YukineFile(['yukine'], 'yukine.txt', {
  lastModified: yestoday.getTime()
});
yestodayFile.isModifiedToday();
// => false

Todo

I will publish some plugins for ExFile, the followings are todos.

• @ex-file/select-files: open a file select dialog by function call, and get ExFile asynchronous.
• @ex-file/read-as-stream: asynchronous read file part by part.
• @ex-file/get-md5: get the md5 of file using SparkMD5.
• @ex-file/get-local-url: get a blob url for a file.
• @ex-file/get-image-size: asynchronous get size of a image file.
• @ex-file/get-audio-duration: asynchronous get the audio duration of a audio file.
• @ex-file/read-text: asynchronous read text in a file.