gitclient.cpp

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**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
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** accordance with the commercial license agreement provided with the
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** use the contact form at http://qt.digia.com/contact-us.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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#include "gitclient.h"
#include "gitutils.h"

#include "commitdata.h"
#include "gitconstants.h"
#include "gitplugin.h"
#include "gitsubmiteditor.h"
#include "gitversioncontrol.h"
#include "mergetool.h"

#include <vcsbase/submitfilemodel.h>

#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/icore.h>
#include <coreplugin/vcsmanager.h>
#include <coreplugin/id.h>
#include <coreplugin/iversioncontrol.h>

#include <utils/hostosinfo.h>
#include <utils/qtcassert.h>
#include <utils/qtcprocess.h>
#include <utils/synchronousprocess.h>
#include <utils/fileutils.h>
#include <vcsbase/command.h>
#include <vcsbase/vcsbaseeditor.h>
#include <vcsbase/vcsbaseeditorparameterwidget.h>
#include <vcsbase/vcsbaseoutputwindow.h>
#include <vcsbase/vcsbaseplugin.h>

#include <diffeditor/diffeditor.h>
#include <diffeditor/diffshoweditor.h>
#include <diffeditor/diffeditorconstants.h>

#include <QCoreApplication>
#include <QDir>
#include <QFileInfo>
#include <QHash>
#include <QRegExp>
#include <QSignalMapper>
#include <QTime>

#include <QMessageBox>
#include <QPushButton>
#include <QToolButton>
#include <QTextCodec>

static const char GIT_DIRECTORY[] = ".git";
static const char graphLogFormatC[] = "%h %d %an %s %ci";
static const char HEAD[] = "HEAD";
static const char noColorOption[] = "--no-color";
static const char decorateOption[] = "--decorate";

namespace Git {
namespace Internal {

using VcsBase::VcsBasePlugin;

class GitDiffHandler : public QObject
{
    Q_OBJECT

public:
    enum RevisionType {
        WorkingTree,
        Index,
        Other
    };

    struct Revision {
        Revision() : type(WorkingTree) { }
        Revision(RevisionType t) : type(t) { }
        Revision(RevisionType t, const QString &i) : type(t), id(i) { }
        RevisionType type;
        QString id; // can be sha or HEAD
        QString infoText() const
        {
            switch (type) {
            case WorkingTree: return tr("Working tree");
            case Index:       return tr("Index");
            default:          return id;
            }
        }
    };

    GitDiffHandler(DiffEditor::DiffEditor *editor,
                   const QString &gitPath,
                   const QString &workingDirectory,
                   const QProcessEnvironment &environment,
                   int timeout);

    // index -> working tree
    void diffFile(const QString &fileName);
    // stagedFileNames:   HEAD -> index
    // unstagedFileNames: index -> working tree
    void diffFiles(const QStringList &stagedFileNames, const QStringList &unstagedFileNames);
    // index -> working tree
    void diffProjects(const QStringList &projectPaths);
    // index -> working tree
    void diffRepository();
    // branch HEAD -> working tree
    void diffBranch(const QString &branchName);
    // id^ -> id
    void show(const QString &id);

private slots:
    void slotShowDescriptionReceived(const QByteArray &data);
    void slotFileListReceived(const QByteArray &data);
    void slotFileContentsReceived(const QByteArray &data);

private:
    void collectShowDescription(const QString &id);
    void collectFilesList(const QStringList &additionalArguments);
    void prepareForCollection();
    void collectFilesContents();
    void feedEditor();
    QString workingTreeContents(const QString &fileName) const;

    QPointer<DiffEditor::DiffEditor> m_editor;
    const QString m_gitPath;
    const QString m_workingDirectory;
    const QProcessEnvironment m_processEnvironment;
    const int m_timeout;
    const QString m_waitMessage;

    struct RevisionRange {
        RevisionRange() { }
        RevisionRange(const Revision &b, const Revision &e) : begin(b), end(e) { }
        Revision begin;
        Revision end;
    };

    // filename, revision range
    QMap<QString, QList<RevisionRange> > m_requestedRevisionRanges;
    // filename, revision, dummy
    QMap<QString, QMap<Revision, bool> > m_pendingRevisions;
    // filename, revision, contents
    QMap<QString, QMap<Revision, QString> > m_collectedRevisions;

    RevisionRange m_requestedRevisionRange;
};

inline bool operator<(const GitDiffHandler::Revision &rev1, const GitDiffHandler::Revision &rev2)
{
    if (rev1.type != rev2.type)
        return rev1.type < rev2.type;
    return rev1.id < rev2.id;
}

GitDiffHandler::GitDiffHandler(DiffEditor::DiffEditor *editor,
               const QString &gitPath,
               const QString &workingDirectory,
               const QProcessEnvironment &environment,
               int timeout)
    : m_editor(editor),
      m_gitPath(gitPath),
      m_workingDirectory(workingDirectory),
      m_processEnvironment(environment),
      m_timeout(timeout),
      m_waitMessage(tr("Waiting for data..."))
{
}

void GitDiffHandler::diffFile(const QString &fileName)
{
    m_requestedRevisionRange = RevisionRange(
                Revision(Index),
                Revision(WorkingTree));

    collectFilesList(QStringList() << QLatin1String("--") << fileName);
}

void GitDiffHandler::diffFiles(const QStringList &stagedFileNames, const QStringList &unstagedFileNames)
{
    RevisionRange stagedRange = RevisionRange(
                Revision(Other, QLatin1String(HEAD)),
                Revision(Index));
    RevisionRange unstagedRange = RevisionRange(
                Revision(Index),
                Revision(WorkingTree));

    for (int i = 0; i < stagedFileNames.count(); i++)
        m_requestedRevisionRanges[stagedFileNames.at(i)].append(stagedRange);

    for (int i = 0; i < unstagedFileNames.count(); i++)
        m_requestedRevisionRanges[unstagedFileNames.at(i)].append(unstagedRange);

    prepareForCollection();
    collectFilesContents();
}

void GitDiffHandler::diffProjects(const QStringList &projectPaths)
{
    m_requestedRevisionRange = RevisionRange(
                Revision(Index),
                Revision(WorkingTree));

    collectFilesList(QStringList() << QLatin1String("--") << projectPaths);
}

void GitDiffHandler::diffRepository()
{
    m_requestedRevisionRange = RevisionRange(
                Revision(Index),
                Revision(WorkingTree));

    collectFilesList(QStringList());
}

void GitDiffHandler::diffBranch(const QString &branchName)
{
    m_requestedRevisionRange = RevisionRange(
                Revision(Other, branchName),
                Revision(WorkingTree));

    collectFilesList(QStringList() << branchName);
}

void GitDiffHandler::show(const QString &id)
{
    Revision begin(Other, id + QLatin1Char('^'));
    Revision end(Other, id);
    m_requestedRevisionRange = RevisionRange(begin, end);

    collectShowDescription(id);
}

void GitDiffHandler::collectShowDescription(const QString &id)
{
    if (m_editor.isNull())
        return;
    m_editor->clear(m_waitMessage);
    VcsBase::Command *command = new VcsBase::Command(m_gitPath, m_workingDirectory, m_processEnvironment);
    connect(command, SIGNAL(outputData(QByteArray)), this, SLOT(slotShowDescriptionReceived(QByteArray)));
    QStringList arguments;
    arguments << QLatin1String("show") << QLatin1String("-s") << QLatin1String("--format=fuller")
              << QLatin1String(noColorOption) << QLatin1String(decorateOption) << id;
    command->addJob(arguments, m_timeout);
    command->execute();
}

void GitDiffHandler::slotShowDescriptionReceived(const QByteArray &data)
{
    if (m_editor.isNull())
        return;
    const QString description = m_editor->editorWidget()->codec()->toUnicode(data).remove(QLatin1Char('\r'));

    DiffEditor::DiffShowEditor *editor = qobject_cast<DiffEditor::DiffShowEditor *>(m_editor);
    if (editor)
        editor->setDescription(description);

    collectFilesList(QStringList()
                     << m_requestedRevisionRange.begin.id
                     << m_requestedRevisionRange.end.id);
}

void GitDiffHandler::collectFilesList(const QStringList &additionalArguments)
{
    if (m_editor.isNull())
        return;
    m_editor->clear(m_waitMessage);
    VcsBase::Command *command = new VcsBase::Command(m_gitPath, m_workingDirectory, m_processEnvironment);
    connect(command, SIGNAL(outputData(QByteArray)), this, SLOT(slotFileListReceived(QByteArray)));
    QStringList arguments;
    arguments << QLatin1String("diff") << QLatin1String("--name-only") << additionalArguments;
    command->addJob(arguments, m_timeout);
    command->execute();
}

void GitDiffHandler::slotFileListReceived(const QByteArray &data)
{
    if (m_editor.isNull())
        return;

    const QString fileList = m_editor->editorWidget()->codec()->toUnicode(data).remove(QLatin1Char('\r'));
    QStringList fileNames = fileList.split(QLatin1Char('\n'), QString::SkipEmptyParts);
    fileNames.removeDuplicates();

    for (int i = 0; i < fileNames.count(); i++)
        m_requestedRevisionRanges[fileNames.at(i)].append(m_requestedRevisionRange);

    prepareForCollection();
    collectFilesContents();
}

void GitDiffHandler::prepareForCollection()
{
    QMap<QString, QList<RevisionRange> >::const_iterator it
            = m_requestedRevisionRanges.constBegin();
    QMap<QString, QList<RevisionRange> >::const_iterator itEnd
            = m_requestedRevisionRanges.constEnd();
    while (it != itEnd) {
        const QString fileName = it.key();
        const QList<RevisionRange> &ranges = it.value();
        for (int i = 0; i < ranges.count(); i++) {
            const RevisionRange &range = ranges.at(i);
            m_pendingRevisions[fileName][range.begin] = false;
            m_pendingRevisions[fileName][range.end] = false;
        }

        ++it;
    }
}

void GitDiffHandler::collectFilesContents()
{
    QMap<QString, QMap<Revision, bool> >::iterator itFile
            = m_pendingRevisions.begin();
    QMap<QString, QMap<Revision, bool> >::iterator itFileEnd
            = m_pendingRevisions.end();
    while (itFile != itFileEnd) {
        const QString fileName = itFile.key();
        QMap<Revision, bool> &revisions = itFile.value();
        QMap<Revision, bool>::iterator itRev
                = revisions.begin();
        QMap<Revision, bool>::iterator itRevEnd
                = revisions.end();
        while (itRev != itRevEnd) {
            const Revision revision = itRev.key();
            if (revision.type == WorkingTree) {
                // collect file here

                m_collectedRevisions[fileName][revision] = workingTreeContents(fileName);

                itRev = revisions.erase(itRev); // iterate to the next revision
            } else {
                // prepare job here

                VcsBase::Command *command = new VcsBase::Command(m_gitPath, m_workingDirectory, m_processEnvironment);
                connect(command, SIGNAL(outputData(QByteArray)), this, SLOT(slotFileContentsReceived(QByteArray)));

                QString revisionArgument = (revision.type == Other)
                        ? revision.id : QString();
                revisionArgument += QLatin1String(":./");
                QStringList arguments;
                arguments << QLatin1String("show") << revisionArgument + fileName;
                command->addJob(arguments, m_timeout);
                command->execute();

                return;
            }
        }

        itFile = m_pendingRevisions.erase(itFile); // iterate to the next file
    }

    feedEditor();
}

void GitDiffHandler::slotFileContentsReceived(const QByteArray &data)
{
    if (m_editor.isNull())
        return;

    QMap<QString, QMap<Revision, bool> >::iterator itFile
            = m_pendingRevisions.begin();
    QMap<QString, QMap<Revision, bool> >::iterator itFileEnd
            = m_pendingRevisions.end();
    if (itFile != itFileEnd) {
        const QString fileName = itFile.key();
        QMap<Revision, bool> &revisions = itFile.value();
        QMap<Revision, bool>::iterator itRev
                = revisions.begin();
        QMap<Revision, bool>::iterator itRevEnd
                = revisions.end();
        if (itRev != itRevEnd) {
            const QString contents = m_editor->editorWidget()->codec()->toUnicode(data).remove(QLatin1Char('\r'));
            m_collectedRevisions[fileName][itRev.key()] = contents;

            itRev = revisions.erase(itRev);
            if (revisions.isEmpty())
                m_pendingRevisions.erase(itFile);
        }
    }

    collectFilesContents();
}

void GitDiffHandler::feedEditor()
{
    QList<DiffEditor::DiffEditorWidget::DiffFilesContents> list;

    QMap<QString, QList<RevisionRange> >::const_iterator itFile
            = m_requestedRevisionRanges.constBegin();
    QMap<QString, QList<RevisionRange> >::const_iterator itFileEnd
            = m_requestedRevisionRanges.constEnd();
    while (itFile != itFileEnd) {
        const QString fileName = itFile.key();
        const QList<RevisionRange> &ranges = itFile.value();
        for (int i = 0; i < ranges.count(); i++) {
            const Revision leftRevision = ranges.at(i).begin;
            const Revision rightRevision = ranges.at(i).end;

            DiffEditor::DiffEditorWidget::DiffFilesContents dfc;
            dfc.leftFileInfo = DiffEditor::DiffEditorWidget::DiffFileInfo(fileName, leftRevision.infoText());
            dfc.leftText = m_collectedRevisions[fileName][leftRevision];
            dfc.rightFileInfo = DiffEditor::DiffEditorWidget::DiffFileInfo(fileName, rightRevision.infoText());
            dfc.rightText = m_collectedRevisions[fileName][rightRevision];
            list.append(dfc);
        }

        ++itFile;
    }

    m_editor->setDiff(list, m_workingDirectory);
    deleteLater();
}

QString GitDiffHandler::workingTreeContents(const QString &fileName) const
{
    QDir workingDir(m_workingDirectory);
    QString absoluteFileName = workingDir.absoluteFilePath(fileName);

    QFile file(absoluteFileName);
    if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        return m_editor->editorWidget()->codec()->toUnicode(file.readAll());
    }
    return QString();
}

///////////////////////////////////////////////////////////

class BaseGitDiffArgumentsWidget : public VcsBase::VcsBaseEditorParameterWidget
{
    Q_OBJECT

public:
    BaseGitDiffArgumentsWidget(GitClient *client, const QString &directory,
                               const QStringList &args) :
        m_workingDirectory(directory),
        m_client(client)
    {
        QTC_ASSERT(!directory.isEmpty(), return);
        QTC_ASSERT(m_client, return);

        m_patienceButton = addToggleButton(QLatin1String("--patience"), tr("Patience"),
                                           tr("Use the patience algorithm for calculating the differences."));
        mapSetting(m_patienceButton, client->settings()->boolPointer(GitSettings::diffPatienceKey));
        m_ignoreWSButton = addToggleButton(QLatin1String("--ignore-space-change"), tr("Ignore Whitespace"),
                                           tr("Ignore whitespace only changes."));
        mapSetting(m_ignoreWSButton, m_client->settings()->boolPointer(GitSettings::ignoreSpaceChangesInDiffKey));

        setBaseArguments(args);
    }

protected:
    QString m_workingDirectory;
    GitClient *m_client;
    QToolButton *m_patienceButton;
    QToolButton *m_ignoreWSButton;
};

class GitCommitDiffArgumentsWidget : public BaseGitDiffArgumentsWidget
{
    Q_OBJECT

public:
    GitCommitDiffArgumentsWidget(Git::Internal::GitClient *client, const QString &directory,
                                 const QStringList &args, const QStringList &unstaged,
                                 const QStringList &staged) :
        BaseGitDiffArgumentsWidget(client, directory, args),
        m_unstagedFileNames(unstaged),
        m_stagedFileNames(staged)
    { }

    void executeCommand()
    {
        m_client->diff(m_workingDirectory, arguments(), m_unstagedFileNames, m_stagedFileNames);
    }

private:
    const QStringList m_unstagedFileNames;
    const QStringList m_stagedFileNames;
};

class GitFileDiffArgumentsWidget : public BaseGitDiffArgumentsWidget
{
    Q_OBJECT
public:
    GitFileDiffArgumentsWidget(Git::Internal::GitClient *client, const QString &directory,
                               const QStringList &args, const QString &file) :
        BaseGitDiffArgumentsWidget(client, directory, args),
        m_fileName(file)
    { }

    void executeCommand()
    {
        m_client->diff(m_workingDirectory, arguments(), m_fileName);
    }

private:
    const QString m_fileName;
};

class GitBranchDiffArgumentsWidget : public BaseGitDiffArgumentsWidget
{
    Q_OBJECT
public:
    GitBranchDiffArgumentsWidget(Git::Internal::GitClient *client, const QString &directory,
                                 const QStringList &args, const QString &branch) :
        BaseGitDiffArgumentsWidget(client, directory, args),
        m_branchName(branch)
    { }

    void executeCommand()
    {
        m_client->diffBranch(m_workingDirectory, arguments(), m_branchName);
    }

private:
    const QString m_branchName;
};

class GitShowArgumentsWidget : public BaseGitDiffArgumentsWidget
{
    Q_OBJECT

public:
    GitShowArgumentsWidget(Git::Internal::GitClient *client,
                           const QString &directory,
                           const QStringList &args,
                           const QString &id) :
        BaseGitDiffArgumentsWidget(client, directory, args),
        m_client(client),
        m_workingDirectory(directory),
        m_id(id)
    {
        QList<ComboBoxItem> prettyChoices;
        prettyChoices << ComboBoxItem(tr("oneline"), QLatin1String("oneline"))
                      << ComboBoxItem(tr("short"), QLatin1String("short"))
                      << ComboBoxItem(tr("medium"), QLatin1String("medium"))
                      << ComboBoxItem(tr("full"), QLatin1String("full"))
                      << ComboBoxItem(tr("fuller"), QLatin1String("fuller"))
                      << ComboBoxItem(tr("email"), QLatin1String("email"))
                      << ComboBoxItem(tr("raw"), QLatin1String("raw"));
        mapSetting(addComboBox(QStringList(QLatin1String("--pretty=%1")), prettyChoices),
                   m_client->settings()->intPointer(GitSettings::showPrettyFormatKey));
    }

    void executeCommand()
    {
        m_client->show(m_workingDirectory, m_id, arguments());
    }

private:
    GitClient *m_client;
    QString m_workingDirectory;
    QString m_id;
};

class GitBlameArgumentsWidget : public VcsBase::VcsBaseEditorParameterWidget
{
    Q_OBJECT

public:
    GitBlameArgumentsWidget(Git::Internal::GitClient *client,
                            const QString &directory,
                            const QStringList &args,
                            const QString &revision, const QString &fileName) :
        m_editor(0),
        m_client(client),
        m_workingDirectory(directory),
        m_revision(revision),
        m_fileName(fileName)
    {
        mapSetting(addToggleButton(QString(), tr("Omit Date"),
                                   tr("Hide the date of a change from the output.")),
                   m_client->settings()->boolPointer(GitSettings::omitAnnotationDateKey));
        mapSetting(addToggleButton(QLatin1String("-w"), tr("Ignore Whitespace"),
                                   tr("Ignore whitespace only changes.")),
                   m_client->settings()->boolPointer(GitSettings::ignoreSpaceChangesInBlameKey));

        setBaseArguments(args);
    }

    void setEditor(VcsBase::VcsBaseEditorWidget *editor)
    {
        QTC_ASSERT(editor, return);
        m_editor = editor;
    }

    void executeCommand()
    {
        int line = -1;
        if (m_editor)
            line = m_editor->lineNumberOfCurrentEditor();
        m_client->blame(m_workingDirectory, arguments(), m_fileName, m_revision, line);
    }

private:
    VcsBase::VcsBaseEditorWidget *m_editor;
    GitClient *m_client;
    QString m_workingDirectory;
    QString m_revision;
    QString m_fileName;
};

class GitLogArgumentsWidget : public BaseGitDiffArgumentsWidget
{
    Q_OBJECT

public:
    GitLogArgumentsWidget(Git::Internal::GitClient *client,
                          const QString &directory,
                          bool enableAnnotationContextMenu,
                          const QStringList &args,
                          const QStringList &fileNames) :
        BaseGitDiffArgumentsWidget(client, directory, args),
        m_client(client),
        m_workingDirectory(directory),
        m_enableAnnotationContextMenu(enableAnnotationContextMenu),
        m_fileNames(fileNames)
    {
        QTC_ASSERT(!directory.isEmpty(), return);
        QToolButton *diffButton = addToggleButton(QLatin1String("--patch"), tr("Show Diff"),
                                              tr("Show difference."));
        mapSetting(diffButton, m_client->settings()->boolPointer(GitSettings::logDiffKey));
        connect(diffButton, SIGNAL(toggled(bool)), m_patienceButton, SLOT(setVisible(bool)));
        connect(diffButton, SIGNAL(toggled(bool)), m_ignoreWSButton, SLOT(setVisible(bool)));
        m_patienceButton->setVisible(diffButton->isChecked());
        m_ignoreWSButton->setVisible(diffButton->isChecked());
        QStringList graphArguments(QLatin1String("--graph"));
        graphArguments << QLatin1String("--oneline") << QLatin1String("--topo-order");
        graphArguments << (QLatin1String("--pretty=format:") + QLatin1String(graphLogFormatC));
        QToolButton *graphButton = addToggleButton(graphArguments, tr("Graph"),
                                              tr("Show textual graph log."));
        mapSetting(graphButton, m_client->settings()->boolPointer(GitSettings::graphLogKey));
    }

    void executeCommand()
    {
        m_client->log(m_workingDirectory, m_fileNames, m_enableAnnotationContextMenu, arguments());
    }

private:
    GitClient *m_client;
    QString m_workingDirectory;
    bool m_enableAnnotationContextMenu;
    QStringList m_fileNames;
};

class ConflictHandler : public QObject
{
    Q_OBJECT
public:
    ConflictHandler(VcsBase::Command *parentCommand,
                    const QString &workingDirectory,
                    const QString &command = QString())
        : QObject(parentCommand),
          m_workingDirectory(workingDirectory),
          m_command(command)
    {
        if (parentCommand) {
            parentCommand->setExpectChanges(true);
            connect(parentCommand, SIGNAL(outputData(QByteArray)), this, SLOT(readStdOut(QByteArray)));
            connect(parentCommand, SIGNAL(errorText(QString)), this, SLOT(readStdErr(QString)));
        }
    }

    ~ConflictHandler()
    {
        GitClient *client = GitPlugin::instance()->gitClient();
        if (m_commit.isEmpty() && m_files.isEmpty()) {
            if (client->checkCommandInProgress(m_workingDirectory) == GitClient::NoCommand)
                client->endStashScope(m_workingDirectory);
        } else {
            client->handleMergeConflicts(m_workingDirectory, m_commit, m_files, m_command);
        }
    }

    void readStdOutString(const QString &data)
    {
        static QRegExp patchFailedRE(QLatin1String("Patch failed at ([^\\n]*)"));
        static QRegExp conflictedFilesRE(QLatin1String("Merge conflict in ([^\\n]*)"));
        if (patchFailedRE.indexIn(data) != -1)
            m_commit = patchFailedRE.cap(1);
        int fileIndex = -1;
        while ((fileIndex = conflictedFilesRE.indexIn(data, fileIndex + 1)) != -1) {
            m_files.append(conflictedFilesRE.cap(1));
        }
    }
public slots:
    void readStdOut(const QByteArray &data)
    {
        readStdOutString(QString::fromUtf8(data));
    }

    void readStdErr(const QString &data)
    {
        static QRegExp couldNotApplyRE(QLatin1String("[Cc]ould not (?:apply|revert) ([^\\n]*)"));
        if (couldNotApplyRE.indexIn(data) != -1)
            m_commit = couldNotApplyRE.cap(1);
    }
private:
    QString m_workingDirectory;
    QString m_command;
    QString m_commit;
    QStringList m_files;
};


Core::IEditor *locateEditor(const char *property, const QString &entry)
{
    foreach (Core::IEditor *ed, Core::ICore::editorManager()->openedEditors())
        if (ed->document()->property(property).toString() == entry)
            return ed;
    return 0;
}

// Return converted command output, remove '\r' read on Windows
static inline QString commandOutputFromLocal8Bit(const QByteArray &a)
{
    QString output = QString::fromLocal8Bit(a);
    output.remove(QLatin1Char('\r'));
    return output;
}

// Return converted command output split into lines
static inline QStringList commandOutputLinesFromLocal8Bit(const QByteArray &a)
{
    QString output = commandOutputFromLocal8Bit(a);
    const QChar newLine = QLatin1Char('\n');
    if (output.endsWith(newLine))
        output.truncate(output.size() - 1);
    if (output.isEmpty())
        return QStringList();
    return output.split(newLine);
}

static inline VcsBase::VcsBaseOutputWindow *outputWindow()
{
    return VcsBase::VcsBaseOutputWindow::instance();
}

static inline QString msgRepositoryNotFound(const QString &dir)
{
    return GitClient::tr("Cannot determine the repository for \"%1\".").arg(dir);
}

static inline QString msgParseFilesFailed()
{
    return  GitClient::tr("Cannot parse the file output.");
}

static inline QString currentDocumentPath()
{
    if (Core::IEditor *editor = Core::EditorManager::currentEditor())
        return QFileInfo(editor->document()->fileName()).path();
    return QString();
}

// ---------------- GitClient

const char *GitClient::stashNamePrefix = "stash@{";

GitClient::GitClient(GitSettings *settings) :
    m_cachedGitVersion(0),
    m_msgWait(tr("Waiting for data...")),
    m_settings(settings),
    m_disableEditor(false)
{
    QTC_CHECK(settings);
    connect(Core::ICore::instance(), SIGNAL(saveSettingsRequested()), this, SLOT(saveSettings()));
    m_gitQtcEditor = QString::fromLatin1("\"%1\" -client -block -pid %2")
            .arg(QCoreApplication::applicationFilePath())
            .arg(QCoreApplication::applicationPid());
}

GitClient::~GitClient()
{
}

QString GitClient::findRepositoryForDirectory(const QString &dir)
{
    if (dir.isEmpty() || dir.endsWith(QLatin1String("/.git"))
            || dir.contains(QLatin1String("/.git/"))) {
        return QString();
    }
    QDir directory(dir);
    QString dotGit = QLatin1String(GIT_DIRECTORY);
    // QFileInfo is outside loop, because it is faster this way
    QFileInfo fileInfo;
    do {
        if (directory.exists(dotGit)) {
            fileInfo.setFile(directory, dotGit);
            if (fileInfo.isFile())
                return directory.absolutePath();
            else if (directory.exists(QLatin1String(".git/config")))
                return directory.absolutePath();
        }
    } while (directory.cdUp());
    return QString();
}

QString GitClient::findGitDirForRepository(const QString &repositoryDir) const
{
    static QHash<QString, QString> repoDirCache;
    QString &res = repoDirCache[repositoryDir];
    if (!res.isEmpty())
        return res;
    QByteArray outputText;
    QStringList arguments;
    arguments << QLatin1String("rev-parse") << QLatin1String("--git-dir");
    fullySynchronousGit(repositoryDir, arguments, &outputText, 0, false);
    res = QString::fromLocal8Bit(outputText.trimmed());
    if (!QDir(res).isAbsolute())
        res.prepend(repositoryDir + QLatin1Char('/'));
    return res;
}

VcsBase::VcsBaseEditorWidget *GitClient::findExistingVCSEditor(const char *registerDynamicProperty,
                                                               const QString &dynamicPropertyValue) const
{
    VcsBase::VcsBaseEditorWidget *rc = 0;
    Core::IEditor *outputEditor = locateEditor(registerDynamicProperty, dynamicPropertyValue);
    if (!outputEditor)
        return 0;

    // Exists already
    Core::EditorManager::activateEditor(outputEditor);
    outputEditor->createNew(m_msgWait);
    rc = VcsBase::VcsBaseEditorWidget::getVcsBaseEditor(outputEditor);

    return rc;
}

DiffEditor::DiffEditor *GitClient::findExistingOrOpenNewDiffEditor(const char *registerDynamicProperty,
    const QString &dynamicPropertyValue, const QString &titlePattern, const Core::Id editorId) const
{
    Core::IEditor *outputEditor = locateEditor(registerDynamicProperty, dynamicPropertyValue);
    if (outputEditor) {
        // Exists already
        Core::EditorManager::activateEditor(outputEditor);
        outputEditor->createNew(m_msgWait);
    }

    DiffEditor::DiffEditor *editor = qobject_cast<DiffEditor::DiffEditor *>(outputEditor);
    if (!editor) {
        QString title = titlePattern;
        editor = qobject_cast<DiffEditor::DiffEditor *>(
                    Core::EditorManager::openEditorWithContents(editorId, &title, m_msgWait));
        editor->document()->setProperty(registerDynamicProperty, dynamicPropertyValue);
        Core::EditorManager::activateEditor(editor);
    }
    return editor;
}


/* Create an editor associated to VCS output of a source file/directory
 * (using the file's codec). Makes use of a dynamic property to find an
 * existing instance and to reuse it (in case, say, 'git diff foo' is
 * already open). */
VcsBase::VcsBaseEditorWidget *GitClient::createVcsEditor(const Core::Id &id,
                                                         QString title,
                                                         // Source file or directory
                                                         const QString &source,
                                                         CodecType codecType,
                                                         // Dynamic property and value to identify that editor
                                                         const char *registerDynamicProperty,
                                                         const QString &dynamicPropertyValue,
                                                         QWidget *configWidget) const
{
    VcsBase::VcsBaseEditorWidget *rc = 0;
    QTC_CHECK(!findExistingVCSEditor(registerDynamicProperty, dynamicPropertyValue));

    // Create new, set wait message, set up with source and codec
    Core::IEditor *outputEditor = Core::EditorManager::openEditorWithContents(id, &title, m_msgWait);
    outputEditor->document()->setProperty(registerDynamicProperty, dynamicPropertyValue);
    rc = VcsBase::VcsBaseEditorWidget::getVcsBaseEditor(outputEditor);
    connect(rc, SIGNAL(annotateRevisionRequested(QString,QString,int)),
            this, SLOT(slotBlameRevisionRequested(QString,QString,int)));
    QTC_ASSERT(rc, return 0);
    rc->setSource(source);
    if (codecType == CodecSource) {
        rc->setCodec(getSourceCodec(source));
    } else if (codecType == CodecLogOutput) {
        QString encodingName = readConfigValue(source, QLatin1String("i18n.logOutputEncoding"));
        if (encodingName.isEmpty())
            encodingName = QLatin1String("utf-8");
        rc->setCodec(QTextCodec::codecForName(encodingName.toLocal8Bit()));
    }

    rc->setForceReadOnly(true);
    Core::EditorManager::activateEditor(outputEditor);

    if (configWidget)
        rc->setConfigurationWidget(configWidget);

    return rc;
}

void GitClient::diff(const QString &workingDirectory,
                     const QStringList &diffArgs,
                     const QStringList &unstagedFileNames,
                     const QStringList &stagedFileNames)
{
    const QString title = tr("Git Diff");
    const int timeout = settings()->intValue(GitSettings::timeoutKey);

    if (settings()->boolValue(GitSettings::useDiffEditorKey)) {
        DiffEditor::DiffEditor *editor = findExistingOrOpenNewDiffEditor(
                    "originalFileName",
                    workingDirectory,
                    title,
                    DiffEditor::Constants::DIFF_EDITOR_ID);

        GitDiffHandler *handler = new GitDiffHandler(editor, gitBinaryPath(), workingDirectory, processEnvironment(), timeout);

        if (unstagedFileNames.empty() && stagedFileNames.empty()) {
            // local repository diff
            handler->diffRepository();
        } else if (!stagedFileNames.empty()) {
            // diff of selected files only with --cached option, used in commit editor
            handler->diffFiles(stagedFileNames, unstagedFileNames);
        } else {
            // current project diff
            handler->diffProjects(unstagedFileNames);
        }
    } else {
        const QString binary = settings()->stringValue(GitSettings::binaryPathKey);
        const Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;

        VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("originalFileName", workingDirectory);
        if (!editor) {
            GitCommitDiffArgumentsWidget *argWidget =
                    new GitCommitDiffArgumentsWidget(this, workingDirectory, diffArgs,
                                                     unstagedFileNames, stagedFileNames);

            editor = createVcsEditor(editorId, title,
                                     workingDirectory, CodecSource, "originalFileName", workingDirectory, argWidget);
            connect(editor, SIGNAL(diffChunkReverted(VcsBase::DiffChunk)), argWidget, SLOT(executeCommand()));
        }

        GitCommitDiffArgumentsWidget *argWidget = qobject_cast<GitCommitDiffArgumentsWidget *>(editor->configurationWidget());
        QStringList userDiffArgs = argWidget->arguments();
        editor->setDiffBaseDirectory(workingDirectory);

        // Create a batch of 2 commands to be run after each other in case
        // we have a mixture of staged/unstaged files as is the case
        // when using the submit dialog.
        VcsBase::Command *command = createCommand(workingDirectory, editor);
        // Directory diff?

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

        if (unstagedFileNames.empty() && stagedFileNames.empty()) {
            QStringList arguments(cmdArgs);
            arguments << userDiffArgs;
            outputWindow()->appendCommand(workingDirectory, binary, arguments);
            command->addJob(arguments, timeout);
        } else {
            // Files diff.
            if (!unstagedFileNames.empty()) {
                QStringList arguments(cmdArgs);
                arguments << userDiffArgs;
                arguments << QLatin1String("--") << unstagedFileNames;
                outputWindow()->appendCommand(workingDirectory, binary, arguments);
                command->addJob(arguments, timeout);
            }
            if (!stagedFileNames.empty()) {
                QStringList arguments(cmdArgs);
                arguments << userDiffArgs;
                arguments << QLatin1String("--cached") << diffArgs << QLatin1String("--") << stagedFileNames;
                outputWindow()->appendCommand(workingDirectory, binary, arguments);
                command->addJob(arguments, timeout);
            }
        }
        command->execute();
    }
}