Use .pub-cache from Flutter root, if it exists. (#13358)

The purpose of this PR is to make it so that when the user runs 'flutter', if they have a .pub-cache directory in their flutter root, we use that instead of the default location for the pub cache. Otherwise, it should act as before.

The eventual goal is to support a pre-populated flutter .zip/.tar.gz file that has everything the developer needs in one bundle. In order for that to actually work, we need to have the pub cache be self-contained, and not in the user's home dir.

Another advantage of this is that if you have multiple flutter repos that you're switching between, then the versions in the pub cache will remain static when you switch between them.

This is an attempt to re-land: #13248. Includes a fix for the test that makes it work on bots in the presence of PUB_CACHE being set, and no other changes.
8 files changed
tree: 071428f3fc91d74b7770fc8138b448e8547eea62
  1. bin/
  2. dev/
  3. examples/
  4. packages/
  5. .gitattributes
  6. .gitignore
  7. .travis.yml
  8. analysis_options.yaml
  9. analysis_options_repo.yaml
  10. appveyor.yml
  11. AUTHORS
  12. CONTRIBUTING.md
  13. ISSUE_TEMPLATE.md
  14. LICENSE
  15. PATENTS
  16. README.md
  17. VERSION
README.md

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A new mobile app SDK to help developers and designers build modern mobile apps for iOS and Android. Flutter is an alpha, open-source project.

Documentation

Fast development

Flutter's hot reload helps you quickly and easily experiment, build UIs, add features, and fix bugs faster. Experience sub-second reload times, without losing state, on emulators, simulators, and hardware for iOS and Android.

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Easily compose your UI with Flutter's modern functional-reactive framework and rich set of platform, layout, and foundation widgets. Solve your tough UI challenges with powerful and flexible APIs for 2D, animation, gestures, effects, and more.

class CounterState extends State<Counter> {
  int counter = 0;

  void increment() {
    // Tells the Flutter framework that state has changed,
    // so the framework can run build() and update the display.
    setState(() {
      counter++;
    });
  }

  Widget build(BuildContext context) {
    // This method is rerun every time setState is called.
    // The Flutter framework has been optimized to make rerunning
    // build methods fast, so that you can just rebuild anything that
    // needs updating rather than having to individually change
    // instances of widgets.
    return new Row(
      children: <Widget>[
        new RaisedButton(
          onPressed: increment,
          child: new Text('Increment'),
        ),
        new Text('Count: $counter'),
      ],
    );
  }
}

Browse the widget catalog and learn more about the functional-reactive framework.

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Make your app come to life with platform APIs, 3rd party SDKs, and native code. Flutter lets you reuse your existing Java, Swift, and ObjC code, and access native features and SDKs on iOS and Android.

Accessing platform features is easy. Here is a snippet from our interop example:

Future<Null> getBatteryLevel() async {
  var batteryLevel = 'unknown';
  try {
    int result = await methodChannel.invokeMethod('getBatteryLevel');
    batteryLevel = 'Battery level: $result%';
  } on PlatformException {
    batteryLevel = 'Failed to get battery level.';
  }
  setState(() {
    _batteryLevel = batteryLevel;
  });
}

Learn how to use packages, or write platform channels, to access native code, APIs, and SDKs.

Unified app development

Flutter has the tools and libraries to help you easily bring your ideas to life on iOS and Android. If you don't have any mobile development experience, Flutter is an easy and fast way to build beautiful mobile apps. If you are an experienced iOS or Android developer, you can use Flutter for your views and leverage much of your existing Java/ObjC/Swift investment.

Build

  • Beautiful app UIs
    • Rich 2D GPU-accelerated APIs
    • Reactive framework
    • Animation/motion APIs
    • Material Design and iOS widgets
  • Fluid coding experience
    • Sub-second, stateful hot reload
    • IntelliJ: refactor, code completion, etc
    • Dart language and core libs
    • Package manager
  • Full-featured apps
    • Interop with mobile OS APIs & SDKs
    • Maven/Java
    • Cocoapods/ObjC/Swift

Optimize

  • Test
    • Unit testing
    • Integration testing
    • On-device testing
  • Debug
    • IDE debugger
    • Web-based debugger
    • async/await aware
    • Expression evaluator
  • Profile
    • Timeline
    • CPU and memory
    • In-app perf charts

Deploy

  • Compile
    • Native ARM code
    • Dead code elimination
  • Distribution
    • App Store
    • Play Store

Learn more about what makes Flutter special in the technical overview.

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