Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/lib/src/command/run.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library pub.command.run;
+
+import 'dart:async';
+
+import 'package:barback/barback.dart';
+import 'package:path/path.dart' as p;
+
+import '../command.dart';
+import '../executable.dart';
+import '../io.dart';
+import '../utils.dart';
+
+/// Handles the `run` pub command.
+class RunCommand extends PubCommand {
+  String get name => "run";
+  String get description =>
+      "Run an executable from a package.\n"
+          "NOTE: We are currently optimizing this command's startup time.";
+  String get invocation => "pub run <executable> [args...]";
+  bool get allowTrailingOptions => false;
+
+  RunCommand() {
+    argParser.addOption(
+        "mode",
+        help: 'Mode to run transformers in.\n'
+            '(defaults to "release" for dependencies, "debug" for ' 'entrypoint)');
+  }
+
+  Future run() {
+    final completer0 = new Completer();
+    scheduleMicrotask(() {
+      try {
+        join0() {
+          var package = entrypoint.root.name;
+          var executable = argResults.rest[0];
+          var args = argResults.rest.skip(1).toList();
+          join1() {
+            var mode;
+            join2() {
+              new Future.value(
+                  runExecutable(entrypoint, package, executable, args, mode: mode)).then((x0) {
+                try {
+                  var exitCode = x0;
+                  new Future.value(flushThenExit(exitCode)).then((x1) {
+                    try {
+                      x1;
+                      completer0.complete();
+                    } catch (e0, s0) {
+                      completer0.completeError(e0, s0);
+                    }
+                  }, onError: completer0.completeError);
+                } catch (e1, s1) {
+                  completer0.completeError(e1, s1);
+                }
+              }, onError: completer0.completeError);
+            }
+            if (argResults['mode'] != null) {
+              mode = new BarbackMode(argResults['mode']);
+              join2();
+            } else {
+              join3() {
+                join2();
+              }
+              if (package == entrypoint.root.name) {
+                mode = BarbackMode.DEBUG;
+                join3();
+              } else {
+                mode = BarbackMode.RELEASE;
+                join3();
+              }
+            }
+          }
+          if (executable.contains(":")) {
+            var components = split1(executable, ":");
+            package = components[0];
+            executable = components[1];
+            join4() {
+              join1();
+            }
+            if (p.split(executable).length > 1) {
+              usageException(
+                  "Cannot run an executable in a subdirectory of a " + "dependency.");
+              join4();
+            } else {
+              join4();
+            }
+          } else {
+            join1();
+          }
+        }
+        if (argResults.rest.isEmpty) {
+          usageException("Must specify an executable to run.");
+          join0();
+        } else {
+          join0();
+        }
+      } catch (e, s) {
+        completer0.completeError(e, s);
+      }
+    });
+    return completer0.future;
+  }
+}