gitclient.cpp

        cmdArgs << QLatin1String("diff") << QLatin1String(noColorOption)
                << userDiffArgs;

        if (!fileName.isEmpty())
            cmdArgs << QLatin1String("--") << fileName;
        executeGit(workingDirectory, cmdArgs, editor);
    }
}

void GitClient::diffBranch(const QString &workingDirectory,
                           const QStringList &diffArgs,
                           const QString &branchName)
{
    const QString title = tr("Git Diff Branch \"%1\"").arg(branchName);
    if (settings()->boolValue(GitSettings::useDiffEditorKey)) {
        DiffEditor::DiffEditor *editor =
                findExistingOrOpenNewDiffEditor("BranchName", branchName, title);

        int timeout = settings()->intValue(GitSettings::timeoutKey);
        GitDiffHandler *handler = new GitDiffHandler(editor, gitBinaryPath(), workingDirectory, processEnvironment(), timeout);
        handler->diffBranch(branchName);
    } else {
        const Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;
        const QString sourceFile = VcsBase::VcsBaseEditorWidget::getSource(workingDirectory, QStringList());

        VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("BranchName", branchName);
        if (!editor)
            editor = createVcsEditor(editorId, title, sourceFile, CodecSource, "BranchName", branchName,
                                     new GitBranchDiffArgumentsWidget(this, workingDirectory,
                                                                      diffArgs, branchName));
        editor->setDiffBaseDirectory(workingDirectory);

        GitBranchDiffArgumentsWidget *argWidget = qobject_cast<GitBranchDiffArgumentsWidget *>(editor->configurationWidget());
        QStringList userDiffArgs = argWidget->arguments();

        QStringList cmdArgs;
        cmdArgs << QLatin1String("diff") << QLatin1String(noColorOption)
                  << userDiffArgs  << branchName;

        executeGit(workingDirectory, cmdArgs, editor);
    }
}

void GitClient::merge(const QString &workingDirectory, const QStringList &unmergedFileNames)
{
    MergeTool *mergeTool = new MergeTool(this);
    if (!mergeTool->start(workingDirectory, unmergedFileNames))
        delete mergeTool;
}

void GitClient::status(const QString &workingDirectory)
{
    // @TODO: Use "--no-color" once it is supported
    QStringList statusArgs(QLatin1String("status"));
    statusArgs << QLatin1String("-u");
    VcsBase::VcsBaseOutputWindow *outwin = outputWindow();
    outwin->setRepository(workingDirectory);
    VcsBase::Command *command = executeGit(workingDirectory, statusArgs, 0, true);
    connect(command, SIGNAL(finished(bool,int,QVariant)), outwin, SLOT(clearRepository()),
            Qt::QueuedConnection);
}

void GitClient::log(const QString &workingDirectory, const QStringList &fileNames,
                    bool enableAnnotationContextMenu, const QStringList &args)
{
    const QString msgArg = fileNames.empty() ? workingDirectory :
                           fileNames.join(QLatin1String(", "));
    const QString title = tr("Git Log \"%1\"").arg(msgArg);
    const Core::Id editorId = Git::Constants::GIT_LOG_EDITOR_ID;
    const QString sourceFile = VcsBase::VcsBaseEditorWidget::getSource(workingDirectory, fileNames);
    VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("logFileName", sourceFile);
    if (!editor)
        editor = createVcsEditor(editorId, title, sourceFile, CodecLogOutput, "logFileName", sourceFile,
                                 new GitLogArgumentsWidget(this, workingDirectory,
                                                           enableAnnotationContextMenu,
                                                           args, fileNames));
    editor->setFileLogAnnotateEnabled(enableAnnotationContextMenu);

    QStringList arguments;
    arguments << QLatin1String("log") << QLatin1String(noColorOption)
              << QLatin1String(decorateOption);

    int logCount = settings()->intValue(GitSettings::logCountKey);
    if (logCount > 0)
         arguments << QLatin1String("-n") << QString::number(logCount);

    GitLogArgumentsWidget *argWidget = qobject_cast<GitLogArgumentsWidget *>(editor->configurationWidget());
    QStringList userArgs = argWidget->arguments();

    arguments.append(userArgs);

    if (!fileNames.isEmpty())
        arguments << QLatin1String("--") << fileNames;

    executeGit(workingDirectory, arguments, editor);
}

// Do not show "0000" or "^32ae4"
static inline bool canShow(const QString &sha)
{
    if (sha.startsWith(QLatin1Char('^')))
        return false;
    if (sha.count(QLatin1Char('0')) == sha.size())
        return false;
    return true;
}

static inline QString msgCannotShow(const QString &sha)
{
    return GitClient::tr("Cannot describe \"%1\".").arg(sha);
}

void GitClient::show(const QString &source, const QString &id,
                     const QStringList &args, const QString &name)
{
    if (!canShow(id)) {
        outputWindow()->append(msgCannotShow(id));
        return;
    }

    const QString title = tr("Git Show \"%1\"").arg(name.isEmpty() ? id : name);
    const QFileInfo sourceFi(source);
    const QString workDir = sourceFi.isDir() ? sourceFi.absoluteFilePath() : sourceFi.absolutePath();
    if (settings()->boolValue(GitSettings::useDiffEditorKey)) {
        DiffEditor::DiffEditor *editor = findExistingOrOpenNewDiffEditor("show", id, title);

        int timeout = settings()->intValue(GitSettings::timeoutKey);
        GitDiffHandler *handler = new GitDiffHandler(editor, gitBinaryPath(),
                                                     findRepositoryForDirectory(workDir),
                                                     processEnvironment(), timeout);
        handler->show(id);
    } else {
        const Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;
        VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("show", id);
        if (!editor)
            editor = createVcsEditor(editorId, title, source, CodecSource, "show", id,
                                     new GitShowArgumentsWidget(this, source, args, id));

        GitShowArgumentsWidget *argWidget = qobject_cast<GitShowArgumentsWidget *>(editor->configurationWidget());
        QStringList userArgs = argWidget->arguments();

        QStringList arguments;
        arguments << QLatin1String("show") << QLatin1String(noColorOption);
        arguments << QLatin1String(decorateOption);
        arguments.append(userArgs);
        arguments << id;

        editor->setDiffBaseDirectory(workDir);
        executeGit(workDir, arguments, editor);
    }
}

void GitClient::saveSettings()
{
    settings()->writeSettings(Core::ICore::settings());
}

void GitClient::slotBlameRevisionRequested(const QString &source, QString change, int lineNumber)
{
    // This might be invoked with a verbose revision description
    // "SHA1 author subject" from the annotation context menu. Strip the rest.
    const int blankPos = change.indexOf(QLatin1Char(' '));
    if (blankPos != -1)
        change.truncate(blankPos);
    const QFileInfo fi(source);
    blame(fi.absolutePath(), QStringList(), fi.fileName(), change, lineNumber);
}

void GitClient::appendOutputData(const QByteArray &data) const
{
    const QTextCodec *codec = getSourceCodec(currentDocumentPath());
    outputWindow()->appendData(codec->toUnicode(data).toLocal8Bit());
}

void GitClient::appendOutputDataSilently(const QByteArray &data) const
{
    const QTextCodec *codec = getSourceCodec(currentDocumentPath());
    outputWindow()->appendDataSilently(codec->toUnicode(data).toLocal8Bit());
}

QTextCodec *GitClient::getSourceCodec(const QString &file) const
{
    if (QFileInfo(file).isFile())
        return VcsBase::VcsBaseEditorWidget::getCodec(file);
    QString encodingName = readConfigValue(file, QLatin1String("gui.encoding"));
    if (encodingName.isEmpty())
        encodingName = QLatin1String("utf-8");
    return QTextCodec::codecForName(encodingName.toLocal8Bit());
}

void GitClient::blame(const QString &workingDirectory,
                      const QStringList &args,
                      const QString &fileName,
                      const QString &revision,
                      int lineNumber)
{
    const Core::Id editorId = Git::Constants::GIT_BLAME_EDITOR_ID;
    const QString id = VcsBase::VcsBaseEditorWidget::getTitleId(workingDirectory, QStringList(fileName), revision);
    const QString title = tr("Git Blame \"%1\"").arg(id);
    const QString sourceFile = VcsBase::VcsBaseEditorWidget::getSource(workingDirectory, fileName);

    VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("blameFileName", id);
    if (!editor) {
        GitBlameArgumentsWidget *argWidget =
                new GitBlameArgumentsWidget(this, workingDirectory, args,
                                            revision, fileName);
        editor = createVcsEditor(editorId, title, sourceFile, CodecSource, "blameFileName", id, argWidget);
        argWidget->setEditor(editor);
    }

    GitBlameArgumentsWidget *argWidget = qobject_cast<GitBlameArgumentsWidget *>(editor->configurationWidget());
    QStringList userBlameArgs = argWidget->arguments();

    QStringList arguments(QLatin1String("blame"));
    arguments << QLatin1String("--root");
    arguments.append(userBlameArgs);
    arguments << QLatin1String("--") << fileName;
    if (!revision.isEmpty())
        arguments << revision;
    executeGit(workingDirectory, arguments, editor, false, lineNumber);
}

bool GitClient::synchronousCheckout(const QString &workingDirectory,
                                          const QString &ref,
                                          QString *errorMessage /* = 0 */)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("checkout") << ref;
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    const QString output = commandOutputFromLocal8Bit(outputText);
    outputWindow()->append(output);
    if (!rc) {
        const QString stdErr = commandOutputFromLocal8Bit(errorText);
        //: Meaning of the arguments: %1: Branch, %2: Repository, %3: Error message
        const QString msg = tr("Cannot checkout \"%1\" of \"%2\": %3").arg(ref, workingDirectory, stdErr);
        if (errorMessage)
            *errorMessage = msg;
        else
            outputWindow()->appendError(msg);
        return false;
    }
    promptSubmoduleUpdate(workingDirectory);
    return true;
}

void GitClient::reset(const QString &workingDirectory, const QString &argument, const QString &commit)
{
    QStringList arguments;
    arguments << QLatin1String("reset") << argument;
    if (!commit.isEmpty())
        arguments << commit;

    VcsBase::Command *cmd = executeGit(workingDirectory, arguments, 0, true);
    connectRepositoryChanged(workingDirectory, cmd);
}

void GitClient::addFile(const QString &workingDirectory, const QString &fileName)
{
    QStringList arguments;
    arguments << QLatin1String("add") << fileName;

    executeGit(workingDirectory, arguments, 0);
}

bool GitClient::synchronousLog(const QString &workingDirectory, const QStringList &arguments,
                               QString *output, QString *errorMessageIn)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList allArguments;
    allArguments << QLatin1String("log") << QLatin1String(GitClient::noColorOption);
    allArguments.append(arguments);
    const bool rc = fullySynchronousGit(workingDirectory, allArguments, &outputText, &errorText);
    if (rc) {
        QString encodingName = readConfigValue(workingDirectory, QLatin1String("i18n.logOutputEncoding"));
        if (encodingName.isEmpty())
            encodingName = QLatin1String("utf-8");
        QTextCodec *codec = QTextCodec::codecForName(encodingName.toLocal8Bit());
        if (codec)
            *output = codec->toUnicode(outputText);
        else
            *output = commandOutputFromLocal8Bit(outputText);
    } else {
        const QString errorMessage = tr("Cannot obtain log of \"%1\": %2").
                                     arg(QDir::toNativeSeparators(workingDirectory),
                                         commandOutputFromLocal8Bit(errorText));
        if (errorMessageIn)
            *errorMessageIn = errorMessage;
        else
            outputWindow()->appendError(errorMessage);
    }
    return rc;
}

// Warning: 'intendToAdd' works only from 1.6.1 onwards
bool GitClient::synchronousAdd(const QString &workingDirectory,
                               bool intendToAdd,
                               const QStringList &files)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("add");
    if (intendToAdd)
        arguments << QLatin1String("--intent-to-add");
    arguments.append(files);
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    if (!rc) {
        const QString errorMessage = tr("Cannot add %n file(s) to \"%1\": %2", 0, files.size()).
                                     arg(QDir::toNativeSeparators(workingDirectory),
                                     commandOutputFromLocal8Bit(errorText));
        outputWindow()->appendError(errorMessage);
    }
    return rc;
}

bool GitClient::synchronousDelete(const QString &workingDirectory,
                                  bool force,
                                  const QStringList &files)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("rm");
    if (force)
        arguments << QLatin1String("--force");
    arguments.append(files);
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    if (!rc) {
        const QString errorMessage = tr("Cannot remove %n file(s) from \"%1\": %2", 0, files.size()).
                                     arg(QDir::toNativeSeparators(workingDirectory), commandOutputFromLocal8Bit(errorText));
        outputWindow()->appendError(errorMessage);
    }
    return rc;
}

bool GitClient::synchronousMove(const QString &workingDirectory,
                                const QString &from,
                                const QString &to)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("mv");
    arguments << (from);
    arguments << (to);
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    if (!rc) {
        const QString errorMessage = tr("Cannot move from \"%1\" to \"%2\": %3").
                                     arg(from, to, commandOutputFromLocal8Bit(errorText));
        outputWindow()->appendError(errorMessage);
    }
    return rc;
}

bool GitClient::synchronousReset(const QString &workingDirectory,
                                 const QStringList &files,
                                 QString *errorMessage)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("reset");
    if (files.isEmpty())
        arguments << QLatin1String("--hard");
    else
        arguments << QLatin1String(HEAD) << QLatin1String("--") << files;
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    const QString output = commandOutputFromLocal8Bit(outputText);
    outputWindow()->append(output);
    // Note that git exits with 1 even if the operation is successful
    // Assume real failure if the output does not contain "foo.cpp modified"
    // or "Unstaged changes after reset" (git 1.7.0).
    if (!rc && (!output.contains(QLatin1String("modified"))
         && !output.contains(QLatin1String("Unstaged changes after reset")))) {
        const QString stdErr = commandOutputFromLocal8Bit(errorText);
        const QString msg = files.isEmpty() ?
                            tr("Cannot reset \"%1\": %2").arg(QDir::toNativeSeparators(workingDirectory), stdErr) :
                            tr("Cannot reset %n file(s) in \"%1\": %2", 0, files.size()).
                            arg(QDir::toNativeSeparators(workingDirectory), stdErr);
        if (errorMessage)
            *errorMessage = msg;
        else
            outputWindow()->appendError(msg);
        return false;
    }
    return true;
}

// Initialize repository
bool GitClient::synchronousInit(const QString &workingDirectory)
{
    QByteArray outputText;
    QByteArray errorText;
    const QStringList arguments(QLatin1String("init"));
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    // '[Re]Initialized...'
    outputWindow()->append(commandOutputFromLocal8Bit(outputText));
    if (!rc)
        outputWindow()->appendError(commandOutputFromLocal8Bit(errorText));
    else {
        // TODO: Turn this into a VcsBaseClient and use resetCachedVcsInfo(...)
        Core::ICore::vcsManager()->resetVersionControlForDirectory(workingDirectory);
    }
    return rc;
}

/* Checkout, supports:
 * git checkout -- <files>
 * git checkout revision -- <files>
 * git checkout revision -- . */
bool GitClient::synchronousCheckoutFiles(const QString &workingDirectory,
                                         QStringList files /* = QStringList() */,
                                         QString revision /* = QString() */,
                                         QString *errorMessage /* = 0 */,
                                         bool revertStaging /* = true */)
{
    if (revertStaging && revision.isEmpty())
        revision = QLatin1String(HEAD);
    if (files.isEmpty())
        files = QStringList(QString(QLatin1Char('.')));
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("checkout");
    if (revertStaging)
        arguments << revision;
    arguments << QLatin1String("--") << files;
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    if (!rc) {
        const QString fileArg = files.join(QLatin1String(", "));
        //: Meaning of the arguments: %1: revision, %2: files, %3: repository,
        //: %4: Error message
        const QString msg = tr("Cannot checkout \"%1\" of %2 in \"%3\": %4").
                            arg(revision, fileArg, workingDirectory, commandOutputFromLocal8Bit(errorText));
        if (errorMessage)
            *errorMessage = msg;
        else
            outputWindow()->appendError(msg);
        return false;
    }
    return true;
}

static inline QString msgParentRevisionFailed(const QString &workingDirectory,
                                              const QString &revision,
                                              const QString &why)
{
    //: Failed to find parent revisions of a SHA1 for "annotate previous"
    return GitClient::tr("Cannot find parent revisions of \"%1\" in \"%2\": %3").arg(revision, workingDirectory, why);
}

static inline QString msgInvalidRevision()
{
    return GitClient::tr("Invalid revision");
}

// Split a line of "<commit> <parent1> ..." to obtain parents from "rev-list" or "log".
static inline bool splitCommitParents(const QString &line,
                                      QString *commit = 0,
                                      QStringList *parents = 0)
{
    if (commit)
        commit->clear();
    if (parents)
        parents->clear();
    QStringList tokens = line.trimmed().split(QLatin1Char(' '));
    if (tokens.size() < 2)
        return false;
    if (commit)
        *commit = tokens.front();
    tokens.pop_front();
    if (parents)
        *parents = tokens;
    return true;
}

bool GitClient::synchronousRevListCmd(const QString &workingDirectory, const QStringList &arguments,
                                      QString *output, QString *errorMessage)
{
    QByteArray outputTextData;
    QByteArray errorText;

    QStringList args(QLatin1String("rev-list"));
    args << QLatin1String(noColorOption) << arguments;

    const bool rc = fullySynchronousGit(workingDirectory, args, &outputTextData, &errorText);
    if (!rc) {
        if (errorMessage)
            *errorMessage = commandOutputFromLocal8Bit(errorText);
        else
            outputWindow()->append(tr("Cannot execute \"git %1\" in \"%2\": %3").arg(
                                       args.join(QLatin1String(" ")), workingDirectory,
                                       commandOutputFromLocal8Bit(errorText)));
        return false;
    }
    *output = commandOutputFromLocal8Bit(outputTextData);
    return true;
}

// Find out the immediate parent revisions of a revision of the repository.
// Might be several in case of merges.
bool GitClient::synchronousParentRevisions(const QString &workingDirectory,
                                           const QStringList &files /* = QStringList() */,
                                           const QString &revision,
                                           QStringList *parents,
                                           QString *errorMessage)
{
    QString outputText;
    QString errorText;
    QStringList arguments;
    if (parents && !isValidRevision(revision)) { // Not Committed Yet
        *parents = QStringList(QLatin1String(HEAD));
        return true;
    }
    arguments << QLatin1String("--parents") << QLatin1String("--max-count=1") << revision;
    if (!files.isEmpty()) {
        arguments.append(QLatin1String("--"));
        arguments.append(files);
    }

    if (!synchronousRevListCmd(workingDirectory, arguments, &outputText, &errorText)) {
        *errorMessage = msgParentRevisionFailed(workingDirectory, revision, errorText);
        return false;
    }
    // Should result in one line of blank-delimited revisions, specifying current first
    // unless it is top.
    outputText.remove(QLatin1Char('\n'));
    if (!splitCommitParents(outputText, 0, parents)) {
        *errorMessage = msgParentRevisionFailed(workingDirectory, revision, msgInvalidRevision());
        return false;
    }
    return true;
}

// Short SHA1, author, subject
static const char defaultShortLogFormatC[] = "%h (%an \"%s";
static const int maxShortLogLength = 120;

QString GitClient::synchronousShortDescription(const QString &workingDirectory, const QString &revision)
{
    // Short SHA 1, author, subject
    QString output = synchronousShortDescription(workingDirectory, revision,
                                                 QLatin1String(defaultShortLogFormatC));
    if (output != revision) {
        if (output.length() > maxShortLogLength) {
            output.truncate(maxShortLogLength);
            output.append(QLatin1String("..."));
        }
        output.append(QLatin1String("\")"));
    }
    return output;
}

QString GitClient::synchronousCurrentLocalBranch(const QString &workingDirectory)
{
    QByteArray outputTextData;
    QStringList arguments;
    arguments << QLatin1String("symbolic-ref") << QLatin1String(HEAD);
    if (fullySynchronousGit(workingDirectory, arguments, &outputTextData, 0, false)) {
        QString branch = commandOutputFromLocal8Bit(outputTextData.trimmed());
        const QString refsHeadsPrefix = QLatin1String("refs/heads/");
        if (branch.startsWith(refsHeadsPrefix)) {
            branch.remove(0, refsHeadsPrefix.count());
            return branch;
        }
    }
    return QString();
}

static inline QString msgCannotDetermineBranch(const QString &workingDirectory, const QString &why)
{
    return GitClient::tr("Cannot retrieve branch of \"%1\": %2").arg(QDir::toNativeSeparators(workingDirectory), why);
}

static inline QString msgCannotRun(const QString &command, const QString &workingDirectory, const QString &why)
{
    return GitClient::tr("Cannot run \"%1\" in \"%2\": %3")
        .arg(command, QDir::toNativeSeparators(workingDirectory), why);
}

bool GitClient::synchronousHeadRefs(const QString &workingDirectory, QStringList *output,
                                    QString *errorMessage)
{
    QStringList args;
    args << QLatin1String("show-ref") << QLatin1String("--head")
         << QLatin1String("--abbrev=10") << QLatin1String("--dereference");
    QByteArray outputText;
    QByteArray errorText;
    const bool rc = fullySynchronousGit(workingDirectory, args, &outputText, &errorText);
    if (!rc) {
        QString message = msgCannotRun(QLatin1String("git show-ref --head"), workingDirectory, commandOutputFromLocal8Bit(errorText));

        if (errorMessage)
            *errorMessage = message;
        else
            outputWindow()->append(message);
        return false;
    }

    QByteArray headSha = outputText.left(10);
    QByteArray newLine("\n");

    int currentIndex = 15;

    while (true) {
        currentIndex = outputText.indexOf(headSha, currentIndex);
        if (currentIndex < 0)
            break;
        currentIndex += 11;
        output->append(QString::fromLocal8Bit(outputText.mid(currentIndex,
                                outputText.indexOf(newLine, currentIndex) - currentIndex)));
   }

    return true;
}

struct TopicData
{
    QDateTime timeStamp;
    QString topic;
};

// Retrieve topic (branch, tag or HEAD hash)
QString GitClient::synchronousTopic(const QString &workingDirectory)
{
    static QHash<QString, TopicData> topicCache;
    QString gitDir = findGitDirForRepository(workingDirectory);
    if (gitDir.isEmpty())
        return QString();
    TopicData &data = topicCache[gitDir];
    QDateTime lastModified = QFileInfo(gitDir + QLatin1String("/HEAD")).lastModified();
    if (lastModified == data.timeStamp)
        return data.topic;
    data.timeStamp = lastModified;
    // First try to find branch
    QString branch = synchronousCurrentLocalBranch(workingDirectory);
    if (!branch.isEmpty())
        return data.topic = branch;

    switch (checkCommandInProgressInGitDir(gitDir)) {
    case Rebase:
    case RebaseMerge:
        return data.topic = tr("REBASING");
    case Revert:
        return data.topic = tr("REVERTING");
    case CherryPick:
        return data.topic = tr("CHERRY-PICKING");
    case Merge:
        return data.topic = tr("MERGING");
    default:
        break;
    }

    // Detached HEAD, try a tag or remote branch
    QStringList references;
    if (!synchronousHeadRefs(workingDirectory, &references))
        return QString();

    const QString tagStart(QLatin1String("refs/tags/"));
    const QString remoteStart(QLatin1String("refs/remotes/"));
    const QString dereference(QLatin1String("^{}"));
    QString remoteBranch;

    foreach (const QString &ref, references) {
        int derefInd = ref.indexOf(dereference);
        if (ref.startsWith(tagStart)) {
            return data.topic = ref.mid(tagStart.size(),
                                        (derefInd == -1) ? -1 : derefInd - tagStart.size());
        }
        if (ref.startsWith(remoteStart)) {
            remoteBranch = ref.mid(remoteStart.size(),
                                   (derefInd == -1) ? -1 : derefInd - remoteStart.size());
        }
    }

    // No tag
    return data.topic = remoteBranch.isEmpty() ? tr("Detached HEAD") : remoteBranch;
}

// Retrieve head revision
QString GitClient::synchronousTopRevision(const QString &workingDirectory, QString *errorMessageIn)
{
    QByteArray outputTextData;
    QByteArray errorText;
    QStringList arguments;
    QString errorMessage;
    // get revision
    arguments << QLatin1String("rev-parse") << QLatin1String(HEAD);
    if (!fullySynchronousGit(workingDirectory, arguments, &outputTextData, &errorText, false)) {
        errorMessage = tr("Cannot retrieve top revision of \"%1\": %2")
                .arg(QDir::toNativeSeparators(workingDirectory), commandOutputFromLocal8Bit(errorText));
        return QString();
    }
    QString revision = commandOutputFromLocal8Bit(outputTextData);
    revision.remove(QLatin1Char('\n'));
    if (revision.isEmpty() && !errorMessage.isEmpty()) {
        if (errorMessageIn)
            *errorMessageIn = errorMessage;
        else
            outputWindow()->appendError(errorMessage);
    }
    return revision;
}

void GitClient::synchronousTagsForCommit(const QString &workingDirectory, const QString &revision,
                                         QByteArray &precedes, QByteArray &follows)
{
    QStringList arguments;
    arguments << QLatin1String("describe") << QLatin1String("--contains") << revision;
    fullySynchronousGit(workingDirectory, arguments, &precedes, 0, false);
    int tilde = precedes.indexOf('~');
    if (tilde != -1)
        precedes.truncate(tilde);
    else
        precedes = precedes.trimmed();

    QStringList parents;
    QString errorMessage;
    synchronousParentRevisions(workingDirectory, QStringList(), revision, &parents, &errorMessage);
    foreach (const QString &p, parents) {
        QByteArray pf;
        arguments.clear();
        arguments << QLatin1String("describe") << QLatin1String("--tags")
                  << QLatin1String("--abbrev=0") << p;
        fullySynchronousGit(workingDirectory, arguments, &pf, 0, false);
        pf.truncate(pf.lastIndexOf('\n'));
        if (!pf.isEmpty()) {
            if (!follows.isEmpty())
                follows += ", ";
            follows += pf;
        }
    }
}

// Format an entry in a one-liner for selection list using git log.
QString GitClient::synchronousShortDescription(const QString &workingDirectory, const QString &revision,
                                            const QString &format)
{
    QString description;
    QByteArray outputTextData;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("log") << QLatin1String(GitClient::noColorOption)
              << (QLatin1String("--pretty=format:") + format)
              << QLatin1String("--max-count=1") << revision;
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputTextData, &errorText);
    if (!rc) {
        VcsBase::VcsBaseOutputWindow *outputWindow = VcsBase::VcsBaseOutputWindow::instance();
        outputWindow->appendSilently(tr("Cannot describe revision \"%1\" in \"%2\": %3")
                                     .arg(revision, workingDirectory, commandOutputFromLocal8Bit(errorText)));
        return revision;
    }
    description = commandOutputFromLocal8Bit(outputTextData);
    if (description.endsWith(QLatin1Char('\n')))
        description.truncate(description.size() - 1);
    return description;
}

// Create a default message to be used for describing stashes
static inline QString creatorStashMessage(const QString &keyword = QString())
{
    QString rc = QCoreApplication::applicationName();
    rc += QLatin1Char(' ');
    if (!keyword.isEmpty()) {
        rc += keyword;
        rc += QLatin1Char(' ');
    }
    rc += QDateTime::currentDateTime().toString(Qt::ISODate);
    return rc;
}

/* Do a stash and return the message as identifier. Note that stash names (stash{n})
 * shift as they are pushed, so, enforce the use of messages to identify them. Flags:
 * StashPromptDescription: Prompt the user for a description message.
 * StashImmediateRestore: Immediately re-apply this stash (used for snapshots), user keeps on working
 * StashIgnoreUnchanged: Be quiet about unchanged repositories (used for IVersionControl's snapshots). */

QString GitClient::synchronousStash(const QString &workingDirectory, const QString &messageKeyword,
                                    unsigned flags, bool *unchanged)
{
    if (unchanged)
        *unchanged = false;
    QString message;
    bool success = false;
    // Check for changes and stash
    QString errorMessage;
    switch (gitStatus(workingDirectory, StatusMode(NoUntracked | NoSubmodules), 0, &errorMessage)) {
    case  StatusChanged: {
        message = creatorStashMessage(messageKeyword);
        do {
            if ((flags & StashPromptDescription)) {
                if (!inputText(Core::ICore::mainWindow(),
                               tr("Stash Description"), tr("Description:"), &message))
                    break;
            }
            if (!executeSynchronousStash(workingDirectory, message))
                break;
            if ((flags & StashImmediateRestore)
                && !synchronousStashRestore(workingDirectory, QLatin1String("stash@{0}")))
                break;
            success = true;
        } while (false);
        break;
    }
    case StatusUnchanged:
        if (unchanged)
            *unchanged = true;
        if (!(flags & StashIgnoreUnchanged))
            outputWindow()->append(msgNoChangedFiles());
        break;
    case StatusFailed:
        outputWindow()->append(errorMessage);
        break;
    }
    if (!success)
        message.clear();
    return message;
}

bool GitClient::executeSynchronousStash(const QString &workingDirectory,
                                        const QString &message,
                                        QString *errorMessage)
{
    QByteArray outputText;
    QByteArray errorText;
    QStringList arguments;
    arguments << QLatin1String("stash");
    if (!message.isEmpty())
        arguments << QLatin1String("save") << message;
    const bool rc = fullySynchronousGit(workingDirectory, arguments, &outputText, &errorText);
    if (!rc) {
        const QString msg = tr("Cannot stash in \"%1\": %2").
                            arg(QDir::toNativeSeparators(workingDirectory),
                                commandOutputFromLocal8Bit(errorText));
        if (errorMessage)
            *errorMessage = msg;
        else
            outputWindow()->appendError(msg);
        return false;
    }
    return true;
}

// Resolve a stash name from message
bool GitClient::stashNameFromMessage(const QString &workingDirectory,
                                     const QString &message, QString *name,
                                     QString *errorMessage)
{
    // All happy
    if (message.startsWith(QLatin1String(stashNamePrefix))) {
        *name = message;
        return true;
    }
    // Retrieve list and find via message
    QList<Stash> stashes;
    if (!synchronousStashList(workingDirectory, &stashes, errorMessage))
        return false;
    foreach (const Stash &s, stashes) {
        if (s.message == message) {
            *name = s.name;
            return true;
        }
    }
    //: Look-up of a stash via its descriptive message failed.
    const QString msg = tr("Cannot resolve stash message \"%1\" in \"%2\".").arg(message, workingDirectory);
    if (errorMessage)
        *errorMessage = msg;
    else
        outputWindow()->append(msg);
    return  false;
}

bool GitClient::synchronousBranchCmd(const QString &workingDirectory, QStringList branchArgs,
                                     QString *output, QString *errorMessage)
{
    branchArgs.push_front(QLatin1String("branch"));
    QByteArray outputText;
    QByteArray errorText;
    const bool rc = fullySynchronousGit(workingDirectory, branchArgs, &outputText, &errorText);
    *output = commandOutputFromLocal8Bit(outputText);
    if (!rc) {
        *errorMessage = msgCannotRun(QLatin1String("git branch"), workingDirectory, commandOutputFromLocal8Bit(errorText));
        return false;
    }
    return true;
}

bool GitClient::synchronousShowRefCmd(const QString &workingDirectory, QStringList args,
                                      QString *output, QString *errorMessage)
{
    args.push_front(QLatin1String("show-ref"));
    QByteArray outputText;
    QByteArray errorText;
    const bool rc = fullySynchronousGit(workingDirectory, args, &outputText, &errorText);
    *output = commandOutputFromLocal8Bit(outputText);
    if (!rc) {
        *errorMessage = msgCannotRun(QLatin1String("git show-ref"),  workingDirectory, commandOutputFromLocal8Bit(errorText));

        return false;
    }
    return true;
}

bool GitClient::synchronousRemoteCmd(const QString &workingDirectory, QStringList remoteArgs,
                                     QString *output, QString *errorMessage)
{
    remoteArgs.push_front(QLatin1String("remote"));
    QByteArray outputText;
    QByteArray errorText;
    const bool rc = fullySynchronousGit(workingDirectory, remoteArgs, &outputText, &errorText);
    if (!rc) {
        *errorMessage = msgCannotRun(QLatin1String("git remote"), workingDirectory, commandOutputFromLocal8Bit(errorText));
        return false;
    }
    *output = commandOutputFromLocal8Bit(outputText);
    return true;
}

QMap<QString,QString> GitClient::synchronousRemotesList(const QString &workingDirectory,
                                                        QString *errorMessage)
{
    QMap<QString,QString> result;
    QString output;
    QString error;
    QStringList args(QLatin1String("-v"));
    if (!synchronousRemoteCmd(workingDirectory, args, &output, &error)) {
        if (errorMessage)
            *errorMessage = error;
        else
            outputWindow()->append(error);
        return result;
    }
    QStringList remotes = output.split(QLatin1String("\n"));

    foreach (const QString &remote, remotes) {
        if (!remote.endsWith(QLatin1String(" (push)")))
            continue;

        QStringList tokens = remote.split(QRegExp(QLatin1String("\\s")),
                                          QString::SkipEmptyParts);
        if (tokens.count() != 3)
            continue;

        result.insert(tokens.at(0), tokens.at(1));
    }
    return result;
}

SubmoduleDataMap GitClient::submoduleList(const QString &workingDirectory)
{
    SubmoduleDataMap result;
    QString gitmodulesFileName = workingDirectory + QLatin1String("/.gitmodules");
    if (!QFile::exists(gitmodulesFileName))
        return result;

    static QMap<QString, SubmoduleDataMap> cachedSubmoduleData;

    if (cachedSubmoduleData.contains(workingDirectory))
        return cachedSubmoduleData.value(workingDirectory);
    QStringList args(QLatin1String("-l"));

    QStringList allConfigs = readConfig(workingDirectory, args).split(QLatin1Char('\n'));
    const QString submoduleLineStart = QLatin1String("submodule.");
    foreach (const QString &configLine, allConfigs) {
        if (!configLine.startsWith(submoduleLineStart))
            continue;

        int nameStart = submoduleLineStart.size();
        int nameEnd   = configLine.indexOf(QLatin1Char('.'), nameStart);

        QString submoduleName = configLine.mid(nameStart, nameEnd - nameStart);

        SubmoduleData submoduleData;
        if (result.contains(submoduleName))
            submoduleData = result[submoduleName];

        if (configLine.mid(nameEnd, 5) == QLatin1String(".url="))
            submoduleData.url = configLine.mid(nameEnd + 5);
        else if (configLine.mid(nameEnd, 8) == QLatin1String(".ignore="))
            submoduleData.ignore = configLine.mid(nameEnd + 8);
        else
            continue;

        result.insert(submoduleName, submoduleData);
    }

    // if config found submodules
    if (!result.isEmpty()) {
        QSettings gitmodulesFile(gitmodulesFileName, QSettings::IniFormat);

        foreach (const QString &submoduleName, result.keys()) {
            gitmodulesFile.beginGroup(QLatin1String("submodule \"") +
                                      submoduleName + QLatin1Char('"'));
            result[submoduleName].dir = gitmodulesFile.value(QLatin1String("path")).toString();
            QString ignore = gitmodulesFile.value(QLatin1String("ignore")).toString();
            if (!ignore.isEmpty() && result[submoduleName].ignore.isEmpty())
                result[submoduleName].ignore = ignore;