anchor.diff:      );
   
       ValidationType atomExists() {
  -      return exitsHappy(<String>['atom', '--version']) ? ValidationType.installed : ValidationType.missing;
  +      bool atomDirExists = FileSystemEntity.isDirectorySync(getAtomHomePath());
  +      return atomDirExists ? ValidationType.installed : ValidationType.missing;
       };
   
       ValidationType flutterPluginExists() {
  -      try {
  -        // apm list -b -p -i
  -        List<String> args = <String>['list', '-b', '-p', '-i'];
  -        printTrace('apm ${args.join(' ')}');
  -        ProcessResult result = Process.runSync('apm', args);
  -        if (result.exitCode != 0)
  -          return ValidationType.missing;
  -        bool available = (result.stdout as String).split('\n').any((String line) {
  -          return line.startsWith('flutter@');
  -        });
  -        return available ? ValidationType.installed : ValidationType.missing;
  -      } catch (error) {
  -        return ValidationType.missing;
  -      }
  +      String flutterPluginPath = path.join(getAtomHomePath(), 'packages', 'flutter');
  +      bool flutterPluginExists = FileSystemEntity.isDirectorySync(flutterPluginPath);
  +      return flutterPluginExists ? ValidationType.installed : ValidationType.missing;
       };
   
       atomValidator.addValidator(new Validator(
  
positive.code: 
  import 'dart:io';
  
  import 'android/android_workflow.dart';
  import 'base/context.dart';
  import 'base/process.dart';
  import 'globals.dart';
  import 'ios/ios_workflow.dart';
  
  
negative.code: }
  
  class _AtomValidator extends DoctorValidator {
    static String getAtomHomePath() {
      final Map<String, String> env = Platform.environment;
      if (env['ATOM_HOME'] != null)
        return env['ATOM_HOME'];
      return os.isWindows
        ? path.join(env['USERPROFILE'], '.atom')
        : path.join(env['HOME'], '.atom');
    }
  
    String get label => 'Atom development environment';
  
    ValidationResult validate() {
  