Use native async/await support in pub.

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

-// Copyright (c) 2013, 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.serve;
-
-import 'dart:async';
-import 'dart:math' as math;
-
-import 'package:barback/barback.dart';
-
-import '../barback/asset_environment.dart';
-import '../barback/pub_package_provider.dart';
-import '../log.dart' as log;
-import '../utils.dart';
-import 'barback.dart';
-
-final _arrow = getSpecial('\u2192', '=>');
-
-/// Handles the `serve` pub command.
-class ServeCommand extends BarbackCommand {
-  String get name => "serve";
-  String get description =>
-      'Run a local web development server.\n\n'
-          'By default, this serves "web/" and "test/", but an explicit list of \n'
-          'directories to serve can be provided as well.';
-  String get invocation => "pub serve [directories...]";
-  String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-serve.html";
-
-  PubPackageProvider _provider;
-
-  String get hostname => argResults['hostname'];
-
-  /// The base port for the servers.
-  ///
-  /// This will print a usage error and exit if the specified port is invalid.
-  int get port => parseInt(argResults['port'], 'port');
-
-  /// The port for the admin UI.
-  ///
-  /// This will print a usage error and exit if the specified port is invalid.
-  int get adminPort {
-    var adminPort = argResults['admin-port'];
-    return adminPort == null ? null : parseInt(adminPort, 'admin port');
-  }
-
-  /// `true` if Dart entrypoints should be compiled to JavaScript.
-  bool get useDart2JS => argResults['dart2js'];
-
-  /// `true` if the admin server URL should be displayed on startup.
-  bool get logAdminUrl => argResults['log-admin-url'];
-
-  BarbackMode get defaultMode => BarbackMode.DEBUG;
-
-  List<String> get defaultSourceDirectories => ["web", "test"];
-
-  /// This completer is used to keep pub running (by not completing) and to
-  /// pipe fatal errors to pub's top-level error-handling machinery.
-  final _completer = new Completer();
-
-  ServeCommand() {
-    argParser.addOption(
-        'hostname',
-        defaultsTo: 'localhost',
-        help: 'The hostname to listen on.');
-    argParser.addOption(
-        'port',
-        defaultsTo: '8080',
-        help: 'The base port to listen on.');
-
-    // TODO(rnystrom): A hidden option to print the URL that the admin server
-    // is bound to on startup. Since this is currently only used for the Web
-    // Socket interface, we don't want to show it to users, but the tests and
-    // Editor need this logged to know what port to bind to.
-    // Remove this (and always log) when #16954 is fixed.
-    argParser.addFlag('log-admin-url', defaultsTo: false, hide: true);
-
-    // TODO(nweiz): Make this public when issue 16954 is fixed.
-    argParser.addOption('admin-port', hide: true);
-
-    argParser.addFlag(
-        'dart2js',
-        defaultsTo: true,
-        help: 'Compile Dart to JavaScript.');
-    argParser.addFlag(
-        'force-poll',
-        defaultsTo: false,
-        help: 'Force the use of a polling filesystem watcher.');
-  }
-
-  Future onRunTransformerCommand() {
-    final completer0 = new Completer();
-    scheduleMicrotask(() {
-      try {
-        var port = parseInt(argResults['port'], 'port');
-        join0(x0) {
-          var adminPort = x0;
-          join1(x1) {
-            var watcherType = x1;
-            new Future.value(
-                AssetEnvironment.create(
-                    entrypoint,
-                    mode,
-                    watcherType: watcherType,
-                    hostname: hostname,
-                    basePort: port,
-                    useDart2JS: useDart2JS)).then((x2) {
-              try {
-                var environment = x2;
-                var directoryLength = sourceDirectories.map(((dir) {
-                  return dir.length;
-                })).reduce(math.max);
-                new Future.value(
-                    environment.startAdminServer(adminPort)).then((x3) {
-                  try {
-                    var server = x3;
-                    server.results.listen(((_) {
-                      assert(false);
-                    }), onError: _fatalError);
-                    join2() {
-                      environment.pauseUpdates();
-                      var it0 = sourceDirectories.iterator;
-                      break0() {
-                        environment.barback.errors.listen(((error) {
-                          log.error(log.red("Build error:\n$error"));
-                        }));
-                        environment.barback.results.listen(((result) {
-                          if (result.succeeded) {
-                            log.message(
-                                "Build completed ${log.green('successfully')}");
-                          } else {
-                            log.message(
-                                "Build completed with " "${log.red(result.errors.length)} errors.");
-                          }
-                        }), onError: _fatalError);
-                        environment.resumeUpdates();
-                        new Future.value(_completer.future).then((x4) {
-                          try {
-                            x4;
-                            completer0.complete();
-                          } catch (e0, s0) {
-                            completer0.completeError(e0, s0);
-                          }
-                        }, onError: completer0.completeError);
-                      }
-                      var trampoline0;
-                      continue0() {
-                        trampoline0 = null;
-                        if (it0.moveNext()) {
-                          var directory = it0.current;
-                          new Future.value(
-                              _startServer(environment, directory, directoryLength)).then((x5) {
-                            trampoline0 = () {
-                              trampoline0 = null;
-                              try {
-                                x5;
-                                trampoline0 = continue0;
-                                do trampoline0(); while (trampoline0 != null);
-                              } catch (e1, s1) {
-                                completer0.completeError(e1, s1);
-                              }
-                            };
-                            do trampoline0(); while (trampoline0 != null);
-                          }, onError: completer0.completeError);
-                        } else {
-                          break0();
-                        }
-                      }
-                      trampoline0 = continue0;
-                      do trampoline0(); while (trampoline0 != null);
-                    }
-                    if (logAdminUrl) {
-                      log.message(
-                          "Running admin server on " "${log.bold('http://${hostname}:${server.port}')}");
-                      join2();
-                    } else {
-                      join2();
-                    }
-                  } catch (e2, s2) {
-                    completer0.completeError(e2, s2);
-                  }
-                }, onError: completer0.completeError);
-              } catch (e3, s3) {
-                completer0.completeError(e3, s3);
-              }
-            }, onError: completer0.completeError);
-          }
-          if (argResults['force-poll']) {
-            join1(WatcherType.POLLING);
-          } else {
-            join1(WatcherType.AUTO);
-          }
-        }
-        if (argResults['admin-port'] == null) {
-          join0(null);
-        } else {
-          join0(parseInt(argResults['admin-port'], 'admin port'));
-        }
-      } catch (e, s) {
-        completer0.completeError(e, s);
-      }
-    });
-    return completer0.future;
-  }
-
-  Future _startServer(AssetEnvironment environment, String rootDirectory,
-      int directoryLength) {
-    final completer0 = new Completer();
-    scheduleMicrotask(() {
-      try {
-        new Future.value(environment.serveDirectory(rootDirectory)).then((x0) {
-          try {
-            var server = x0;
-            join0() {
-              var prefix =
-                  log.gray(padRight("[${server.rootDirectory}]", directoryLength + 2));
-              server.results.listen(((result) {
-                var buffer = new StringBuffer();
-                buffer.write("$prefix ");
-                if (result.isSuccess) {
-                  buffer.write(
-                      "${log.green('GET')} ${result.url.path} $_arrow ${result.id}");
-                } else {
-                  buffer.write("${log.red('GET')} ${result.url.path} $_arrow");
-                  var error = result.error.toString();
-                  if (error.contains("\n")) {
-                    buffer.write("\n${prefixLines(error)}");
-                  } else {
-                    buffer.write(" $error");
-                  }
-                }
-                log.message(buffer);
-              }), onError: _fatalError);
-              log.message(
-                  "Serving ${entrypoint.root.name} "
-                      "${padRight(server.rootDirectory, directoryLength)} "
-                      "on ${log.bold('http://${hostname}:${server.port}')}");
-              completer0.complete();
-            }
-            if (mode == BarbackMode.RELEASE) {
-              server.allowAsset = ((url) {
-                return !url.path.endsWith(".dart");
-              });
-              join0();
-            } else {
-              join0();
-            }
-          } catch (e0, s0) {
-            completer0.completeError(e0, s0);
-          }
-        }, onError: completer0.completeError);
-      } catch (e, s) {
-        completer0.completeError(e, s);
-      }
-    });
-    return completer0.future;
-  }
-
-  /// Reports [error] and exits the server.
-  void _fatalError(error, [stackTrace]) {
-    if (_completer.isCompleted) return;
-    _completer.completeError(error, stackTrace);
-  }
-}