rnystrom@google.com
12b11b4cc0
Previously, it was a mix of both styles. Now it's consistent. :) Review URL: https://codereview.chromium.org//11638010 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@16354 260f80e4-7a28-3924-810f-c04153c831b5
86 lines
2.6 KiB
Dart
86 lines
2.6 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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/// Helper functionality for invoking Git.
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library git;
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import 'io.dart';
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import 'log.dart' as log;
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import 'utils.dart';
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/// Tests whether or not the git command-line app is available for use.
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Future<bool> get isInstalled {
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if (_isGitInstalledCache != null) {
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// TODO(rnystrom): The sleep is to pump the message queue. Can use
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// Future.immediate() when #3356 is fixed.
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return sleep(0).transform((_) => _isGitInstalledCache);
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}
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return _gitCommand.transform((git) => git != null);
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}
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/// Run a git process with [args] from [workingDir]. Returns the stdout as a
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/// list of strings if it succeeded. Completes to an exception if it failed.
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Future<List<String>> run(List<String> args, {String workingDir}) {
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return _gitCommand.chain((git) {
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return runProcess(git, args, workingDir: workingDir);
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}).transform((result) {
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if (!result.success) throw new Exception(
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'Git error. Command: git ${Strings.join(args, " ")}\n'
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'${Strings.join(result.stderr, "\n")}');
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return result.stdout;
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});
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}
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bool _isGitInstalledCache;
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/// The cached Git command.
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String _gitCommandCache;
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/// Returns the name of the git command-line app, or null if Git could not be
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/// found on the user's PATH.
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Future<String> get _gitCommand {
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// TODO(nweiz): Just use Future.immediate once issue 3356 is fixed.
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if (_gitCommandCache != null) {
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return sleep(0).transform((_) => _gitCommandCache);
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}
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return _tryGitCommand("git").chain((success) {
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if (success) return new Future.immediate("git");
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// Git is sometimes installed on Windows as `git.cmd`
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return _tryGitCommand("git.cmd").transform((success) {
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if (success) return "git.cmd";
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return null;
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});
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}).transform((command) {
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log.fine('Determined git command $command.');
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_gitCommandCache = command;
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return command;
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});
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}
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/// Checks whether [command] is the Git command for this computer.
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Future<bool> _tryGitCommand(String command) {
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var completer = new Completer<bool>();
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// If "git --version" prints something familiar, git is working.
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var future = runProcess(command, ["--version"]);
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future.then((results) {
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var regex = new RegExp("^git version");
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completer.complete(results.stdout.length == 1 &&
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regex.hasMatch(results.stdout[0]));
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});
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future.handleException((err) {
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// If the process failed, they probably don't have it.
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completer.complete(false);
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return true;
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});
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return completer.future;
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}
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