fs_shim 2.1.0-7

A portable file system implementation working on io, browser and memory (through idb_shim)

fs_shim

A portable file system library to allow working on io, browser (though idb_shim) and memory (through idb_shim).

API supported

It contains a subset of the io File/Directory API. Basically all sync methods are removed since on the web indexedDB cannot be accessed in a synchronous way.

Classes

• File (create, openWrite, openRead, writeAsBytes, writeAsString, copy)
• Link (create, target)
• Directory (create, list)
• FileSystem (file, link, directory, 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

In memory

A simple usage example:

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

Future main() async {
  final fs = fileSystemMemory;

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

  // and a file in it
  final 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) {
    final 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());
}

Using IO API

Using fs_shim.dart

You can simply replace in the above example:

final fs = fileSystemMemory;

by

final fs = fileSystemIo;

Using fs_io.dart

If you only target io, you can still be able to use File and Directory constructor, replace

import 'dart:io';

by

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';

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

  // Create a top level directory
  // fs.directory('/dir');
  final dir = Directory(dirPath);
  print('dir: $dir');
  // delete its content
  if (await dir.exists()) {
    await dir.delete(recursive: true);
  }

  // and a file in it
  // fs.file(join(dir.path, "file"));
  final file = 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.newLink(join(dir.path, "link"));
    final link = Link(join(dir.path, 'link'));
    await link.create(file.path);

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

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

Browser usage

You can simply replace in the in memory example:

final fs = fileSystemMemory;

by

final fs = fileSystemWeb;

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: https://github.com/tekartik/fs_shim.dart

Features and bugs

• On windows file links are not supported (fs.supportsFileLink returns false)
• On windows directory link target are absolutes
• On the web, the size of the file system is limited by the limit size of indexedDB databases (browser dependent)