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

// Copyright 2016 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 'package:path/path.dart' as path;

import '../base/process.dart';
import '../cache.dart';
import '../globals.dart';
import '../runner/flutter_command.dart';

class FormatCommand extends FlutterCommand {
  @override
  final String name = 'format';

  @override
  List<String> get aliases => const <String>['dartfmt'];

  @override
  final String description = 'Format one or more dart files.';

  @override
  String get invocation => "${runner.executableName} $name <one or more paths>";

  @override
  Future<int> runCommand() async {
    if (argResults.rest.isEmpty) {
      printStatus('No files specified to be formatted.');
      printStatus('');
      printStatus('To format all files in the current directory tree:');
      printStatus('${runner.executableName} $name .');
      printStatus('');
      printStatus(usage);
      return 1;
    }

    String dartfmt = path.join(
        Cache.flutterRoot, 'bin', 'cache', 'dart-sdk', 'bin', 'dartfmt');
    List<String> cmd = <String>[dartfmt, '-w']..addAll(argResults.rest);
    return runCommandAndStreamOutput(cmd);
  }
}