packages/flutter_tools/lib/src/commands/devices.dart

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import '../base/common.dart';
import '../base/utils.dart';
import '../device.dart';
import '../doctor.dart';
import '../globals.dart';
import '../runner/flutter_command.dart';

class DevicesCommand extends FlutterCommand {
  @override
  final String name = 'devices';

  @override
  final String description = 'List all connected devices.';

  @override
  Future<Null> runCommand() async {
    if (!doctor.canListAnything) {
      throwToolExit(
        "Unable to locate a development device; please run 'flutter doctor' for "
        'information about installing additional components.',
        exitCode: 1);
    }

    final List<Device> devices = await deviceManager.getAllConnectedDevices().toList();

    if (devices.isEmpty) {
      printStatus(
        'No devices detected.\n\n'
        "Run 'flutter emulators' to list and start any available device emulators.\n\n"
        'Or, if you expected your device to be detected, please run "flutter doctor" to diagnose\n'
        'potential issues, or visit https://flutter.io/setup/ for troubleshooting tips.');
      final List<String> diagnostics = await deviceManager.getDeviceDiagnostics();
      if (diagnostics.isNotEmpty) {
        printStatus('');
        for (String diagnostic in diagnostics) {
          printStatus('• ${diagnostic.replaceAll('\n', '\n  ')}');
        }
      }
    } else {
      printStatus('${devices.length} connected ${pluralize('device', devices.length)}:\n');
      await Device.printDevices(devices);
    }
  }
}