| // 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 git; |
| |
| import 'io.dart'; |
| import 'utils.dart'; |
| |
| /// Tests whether or not the git command-line app is available for use. |
| Future<bool> get isInstalled { |
| if (_isGitInstalledCache != null) { |
| // TODO(rnystrom): The sleep is to pump the message queue. Can use |
| // Future.immediate() when #3356 is fixed. |
| return sleep(0).transform((_) => _isGitInstalledCache); |
| } |
| |
| return _gitCommand.transform((git) => git != null); |
| } |
| |
| /// 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}) { |
| return _gitCommand.chain((git) { |
| return runProcess(git, args, workingDir: workingDir); |
| }).transform((result) { |
| if (!result.success) throw new Exception( |
| 'Git error. Command: git ${Strings.join(args, " ")}\n' |
| '${Strings.join(result.stderr, "\n")}'); |
| |
| return result.stdout; |
| }); |
| } |
| |
| bool _isGitInstalledCache; |
| |
| /// The cached Git command. |
| String _gitCommandCache; |
| |
| /// Returns the name of the git command-line app, or null if Git could not be |
| /// found on the user's PATH. |
| Future<String> get _gitCommand { |
| // TODO(nweiz): Just use Future.immediate once issue 3356 is fixed. |
| if (_gitCommandCache != null) { |
| return sleep(0).transform((_) => _gitCommandCache); |
| } |
| |
| return _tryGitCommand("git").chain((success) { |
| if (success) return new Future.immediate("git"); |
| |
| // Git is sometimes installed on Windows as `git.cmd` |
| return _tryGitCommand("git.cmd").transform((success) { |
| if (success) return "git.cmd"; |
| return null; |
| }); |
| }).transform((command) { |
| _gitCommandCache = command; |
| return command; |
| }); |
| } |
| |
| /// Checks whether [command] is the Git command for this computer. |
| Future<bool> _tryGitCommand(String command) { |
| var completer = new Completer<bool>(); |
| |
| // If "git --version" prints something familiar, git is working. |
| var future = runProcess(command, ["--version"]); |
| |
| future.then((results) { |
| var regex = new RegExp("^git version"); |
| completer.complete(results.stdout.length == 1 && |
| regex.hasMatch(results.stdout[0])); |
| }); |
| |
| future.handleException((err) { |
| // If the process failed, they probably don't have it. |
| completer.complete(false); |
| return true; |
| }); |
| |
| return completer.future; |
| } |