fs_shim

A portable file system library to allow working on io, browser (though idb_shim), node and memory (through idb_shim), and soon google storage (through storage api), google drive (through google drive api).

It uses a small subset of the file io API (asynchronous only)

API supported

Classes

• File (create, openWrite, openRead, writeAsBytes, writeAsString, copy)
• Link (create, target)
• Directory (create, list)
• FileSystem (directory, file, link, type, isFile, isDirectory, isLink)
• FileSystemEntity (path, exists, delete, rename, absolute, isAbsolute, state, parent)
• FileStat
• FileSystemEntityType,
• FileSystemException,

Static method (IO only)

• Directory.current
• FileSystemEntity.isFile
• FileSystemEntity.isDirectory
• FileSystemEntity.isLink

Usage

Using IO API

Setup

Replace

import 'dart:io';

with

import 'package:fs_shim/fs_io.dart';

Then a reduced set of the IO API can be used, same source code that might requires some cleanup if you import from existing code

Simple example

import 'package:fs_shim/fs_io.dart';
import 'package:path/path.dart';

main() async {
  FileSystem fs = ioFileSystem;
  // safe place when running from package root
  String dirPath = join(Directory.current.path, 'test_out', 'example', 'dir');

  // Create a top level directory
  // fs.directory('/dir');
  Directory dir = new Directory(dirPath);

  // delete its content
  await dir.delete(recursive: true);

  // and a file in it
  // fs.file(join(dir.path, "file"));
  File file = new File(join(dir.path, "file"));

  // create a file
  await file.create(recursive: true);
  await file.writeAsString("Hello world!");

  // read a file
  print('file: ${await file.readAsString()}');

  // use a file link if supported
  if (fs.supportsFileLink) {
    // fs.link(join(dir.path, "link"));
    Link link = new Link(join(dir.path, "link"));
    await link.create(file.path);

    print('link: ${await new File(link.path).readAsString()}');
  }

  // list dir content
  print(await dir.list(recursive: true, followLinks: true).toList());
}

In memory

A simple usage example:

import 'package:fs_shim/fs.dart';
import 'package:fs_shim/fs_memory.dart';
import 'package:path/path.dart';

main() async {
  FileSystem fs = newMemoryFileSystem();

  // Create a top level directory
  Directory dir = fs.directory('/dir');

  // and a file in it
  File file = fs.file(join(dir.path, "file"));

  // create a file
  await file.create(recursive: true);
  await file.writeAsString("Hello world!");

  // read a file
  print('file: ${await file.readAsString()}');

  // use a file link if supported
  if (fs.supportsFileLink) {
    Link link = fs.link(join(dir.path, "link"));
    await link.create(file.path);

    print('link: ${await fs.file(link.path).readAsString()}');
  }

  // list dir content
  print(await dir.list(recursive: true, followLinks: true).toList());
}

Browser usage

import 'package:fs_shim/fs_browser.dart';
import 'package:fs_shim/fs_idb.dart';

FileSystem fs = fileSystemIdb;

Node

Setup

pubspec.yaml:

dependency:
  tekartik_fs_node:
    git:
      url: https://github.com/tekartik/fs_shim.dart
      path: fs_node

A simple usage example:

import 'package:tekartik_fs_node/fs.dart';
import 'package:path/path.dart';

main() async {
  FileSystem fs = fileSystemNode;
  ...

Utilities

• Lightweight glob support (**, * and ? in a posix style path)
• Copy utilities (copy files, directories recursively)

Testing

Dev dependencies

Stable

fs_shim: any

Bleeding age

fs_shim:
  git: 
    url: https://github.com/tekartik/fs_shim.dart
      path: fs

Testing with dartdevc

pub serve test --web-compiler=dartdevc --port=8079
pub run test -p chrome --pub-serve=8079

Features and bugs

• On windows file links are not supported (fs.supportsFileLink returns false)
• On windows directory link target are absolutes
• On node, links are node supported (using this great implementation)