Use native async/await support in pub.

sdk/lib/_internal/pub_generated/lib/src/git.dart

-// Copyright (c) 2012, 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.
-
-/// Helper functionality for invoking Git.
-library pub.git;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:stack_trace/stack_trace.dart';
-
-import 'exceptions.dart';
-import 'io.dart';
-import 'log.dart' as log;
-import 'utils.dart';
-
-/// An exception thrown because a git command failed.
-class GitException implements ApplicationException {
-  /// The arguments to the git command.
-  final List<String> args;
-
-  /// The standard error emitted by git.
-  final String stderr;
-
-  String get message => 'Git error. Command: git ${args.join(" ")}\n$stderr';
-
-  GitException(Iterable<String> args, this.stderr)
-      : args = args.toList();
-
-  String toString() => message;
-}
-
-/// Tests whether or not the git command-line app is available for use.
-bool get isInstalled {
-  if (_isInstalledCache != null) return _isInstalledCache;
-  _isInstalledCache = _gitCommand != null;
-  return _isInstalledCache;
-}
-bool _isInstalledCache;
-
-/// Run a git process with [args] from [workingDir].
-///
-/// Returns the stdout as a list of strings if it succeeded. Completes to an
-/// exception if it failed.
-Future<List<String>> run(List<String> args, {String workingDir, Map<String,
-    String> environment}) {
-  if (!isInstalled) {
-    fail(
-        "Cannot find a Git executable.\n" "Please ensure Git is correctly installed.");
-  }
-
-  log.muteProgress();
-  return runProcess(
-      _gitCommand,
-      args,
-      workingDir: workingDir,
-      environment: environment).then((result) {
-    if (!result.success) throw new GitException(args, result.stderr.join("\n"));
-
-    return result.stdout;
-  }).whenComplete(() {
-    log.unmuteProgress();
-  });
-}
-
-/// Like [run], but synchronous.
-List<String> runSync(List<String> args, {String workingDir, Map<String,
-    String> environment}) {
-  if (!isInstalled) {
-    fail(
-        "Cannot find a Git executable.\n" "Please ensure Git is correctly installed.");
-  }
-
-  var result = runProcessSync(
-      _gitCommand,
-      args,
-      workingDir: workingDir,
-      environment: environment);
-  if (!result.success) throw new GitException(args, result.stderr.join("\n"));
-  return result.stdout;
-}
-
-/// Returns the name of the git command-line app, or null if Git could not be
-/// found on the user's PATH.
-String get _gitCommand {
-  if (_commandCache != null) return _commandCache;
-
-  var command;
-  if (_tryGitCommand("git")) {
-    _commandCache = "git";
-  } else if (_tryGitCommand("git.cmd")) {
-    _commandCache = "git.cmd";
-  } else {
-    return null;
-  }
-
-  log.fine('Determined git command $command.');
-  return _commandCache;
-}
-String _commandCache;
-
-/// Checks whether [command] is the Git command for this computer.
-bool _tryGitCommand(String command) {
-  // If "git --version" prints something familiar, git is working.
-  try {
-    var result = runProcessSync(command, ["--version"]);
-    var regexp = new RegExp("^git version");
-    return result.stdout.length == 1 && regexp.hasMatch(result.stdout.single);
-  } on ProcessException catch (error, stackTrace) {
-    var chain = new Chain.forTrace(stackTrace);
-    // If the process failed, they probably don't have it.
-    log.message('Git command is not "$command": $error\n$chain');
-    return false;
-  }
-}