rnystrom@google.com
10f7ad94ae
Review URL: https://codereview.chromium.org//12262056 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@18550 260f80e4-7a28-3924-810f-c04153c831b5
76 lines
2.3 KiB
Dart
76 lines
2.3 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 'dart:async';
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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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return new Future.immediate(_isGitInstalledCache);
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}
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return _gitCommand.then((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,
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{String workingDir, Map<String, String> environment}) {
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return _gitCommand.then((git) {
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return runProcess(git, args, workingDir: workingDir,
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environment: environment);
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}).then((result) {
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if (!result.success) throw new Exception(
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'Git error. Command: git ${args.join(" ")}\n'
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'${result.stderr.join("\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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if (_gitCommandCache != null) {
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return new Future.immediate(_gitCommandCache);
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}
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return _tryGitCommand("git").then((success) {
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if (success) return "git";
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// Git is sometimes installed on Windows as `git.cmd`
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return _tryGitCommand("git.cmd").then((success) {
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if (success) return "git.cmd";
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return null;
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});
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}).then((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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// If "git --version" prints something familiar, git is working.
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return runProcess(command, ["--version"]).then((results) {
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var regexp = new RegExp("^git version");
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return results.stdout.length == 1 && regexp.hasMatch(results.stdout[0]);
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}).catchError((err) {
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// If the process failed, they probably don't have it.
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return false;
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});
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}
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