adding packages

deprecated/flutter_cli/lib/src/commands/command.dart

@@ -0,0 +1,51 @@
+// Copyright 2017 Google Inc.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+import 'package:args/args.dart';
+import 'package:args/command_runner.dart';
+import 'package:recase/recase.dart';
+
+/// Base class for commands for ngflutter executable.
+abstract class NgDartCommand extends Command {
+  static const binaryName = 'ngflutter';
+  ArgParser get argParser => _argParser;
+  final _argParser = new ArgParser(allowTrailingOptions: true);
+
+  /// Reads argument for current command.
+  String readArg(String errorMessage) {
+    var args = argResults.rest;
+
+    if (args == null || args.length == 0) {
+      // Usage is provided by command runner.
+      throw new UsageException(errorMessage, '');
+    }
+
+    var arg = args.first;
+    args = args.skip(1).toList();
+
+    if (args.length > 0) {
+      throw new UsageException('Unexpected argument $args', '');
+    }
+
+    return arg;
+  }
+
+  /// Reads argument for current command and create an EntityName.
+  ReCase readArgAsEntityName(String errorMessage) =>
+      getEntityName(readArg(errorMessage));
+
+  ReCase getEntityName(String entity) {
+    ReCase entityName;
+
+    try {
+      entityName = new ReCase(entity);
+    } on ArgumentError catch (error) {
+      throw new UsageException(error.message, '');
+    }
+
+    return entityName;
+  }
+}