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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#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 <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";

namespace Git {
namespace Internal {

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(QLatin1String("--pretty"), 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)
    {
        QToolButton *button = addToggleButton(QLatin1String("--patch"), tr("Show Diff"),
                                              tr("Show difference."));
        mapSetting(button, m_client->settings()->boolPointer(GitSettings::logDiffKey));
        connect(button, SIGNAL(toggled(bool)), m_patienceButton, SLOT(setEnabled(bool)));
        connect(button, SIGNAL(toggled(bool)), m_ignoreWSButton, SLOT(setEnabled(bool)));
        m_patienceButton->setEnabled(button->isChecked());
        m_ignoreWSButton->setEnabled(button->isChecked());
    }

    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(QObject *parent,
                    const QString &workingDirectory,
                    const QString &command)
        : QObject(parent),
          m_workingDirectory(workingDirectory),
          m_command(command)
    {
    }

    ~ConflictHandler()
    {
        if (m_commit.isEmpty())
            GitPlugin::instance()->gitVersionControl()->emitRepositoryChanged(m_workingDirectory);
        else
            GitPlugin::instance()->gitClient()->handleMergeConflicts(
                        m_workingDirectory, m_commit, m_command);
    }

    void readStdOutString(const QString &data)
    {
        static QRegExp patchFailedRE(QLatin1String("Patch failed at ([^\\n]*)"));
        if (patchFailedRE.indexIn(data) != -1)
            m_commit = patchFailedRE.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;
};

class RebaseManager : public QObject
{
    Q_OBJECT

public:
    RebaseManager(QObject *parent) : QObject(parent)
    {
    }

public slots:
    void readStdErr(const QString &error)
    {
        // rebase conflict is output to stdOut
        QRegExp conflictedCommit(QLatin1String("Could not apply ([^\\n]*)"));
        conflictedCommit.indexIn(error);
        m_commit = conflictedCommit.cap(1);
    }

    void finished(bool ok, int exitCode, const QVariant &workingDirectory)
    {
        Q_UNUSED(ok);
        if (exitCode != 0 && !m_commit.isEmpty()) {
            GitPlugin::instance()->gitClient()->handleMergeConflicts(
                        workingDirectory.toString(), m_commit, QLatin1String("rebase"));
        }
    }

private:
    QString m_commit;
};

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_repositoryChangedSignalMapper(0),
    m_settings(settings)
{
    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()
{
}

const char *GitClient::noColorOption = "--no-color";
const char *GitClient::decorateOption = "--decorate";

QString GitClient::findRepositoryForDirectory(const QString &dir)
{
    if (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, Core::EditorManager::ModeSwitch);
    outputEditor->createNew(m_msgWait);
    rc = VcsBase::VcsBaseEditorWidget::getVcsBaseEditor(outputEditor);

    return rc;
}

/* 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, Core::EditorManager::ModeSwitch);

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

    return rc;
}

void GitClient::diff(const QString &workingDirectory,
                     const QStringList &diffArgs,
                     const QStringList &unstagedFileNames,
                     const QStringList &stagedFileNames)
{
    const QString binary = settings()->stringValue(GitSettings::binaryPathKey);
    const Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;
    const QString title = tr("Git Diff");

    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);

    int timeout = settings()->intValue(GitSettings::timeoutKey);

    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();
}

void GitClient::diff(const QString &workingDirectory,
                     const QStringList &diffArgs,
                     const QString &fileName)
{
    const Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;
    const QString title = tr("Git Diff \"%1\"").arg(fileName);
    const QString sourceFile = VcsBase::VcsBaseEditorWidget::getSource(workingDirectory, fileName);

    VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("originalFileName", sourceFile);
    if (!editor) {
        GitFileDiffArgumentsWidget *argWidget =
                new GitFileDiffArgumentsWidget(this, workingDirectory, diffArgs, fileName);

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

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

    QStringList cmdArgs;
    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 Core::Id editorId = Git::Constants::GIT_DIFF_EDITOR_ID;
    const QString title = tr("Git Diff Branch \"%1\"").arg(branchName);
    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);
}

static const char graphLogFormatC[] = "%h %d %an %s %ci";

// Create a graphical log.
void GitClient::graphLog(const QString &workingDirectory, const QString & branch)
{
    QStringList arguments;
    arguments << QLatin1String("log") << QLatin1String(noColorOption);

    int logCount = settings()->intValue(GitSettings::logCountKey);
    if (logCount > 0)
         arguments << QLatin1String("-n") << QString::number(logCount);
    arguments << (QLatin1String("--pretty=format:") +  QLatin1String(graphLogFormatC))
              << QLatin1String("--topo-order") <<  QLatin1String("--graph");

    QString title;
    if (branch.isEmpty()) {
        title = tr("Git Log");
    } else {
        title = tr("Git Log \"%1\"").arg(branch);
        arguments << branch;
    }
    const Core::Id editorId = Git::Constants::GIT_LOG_EDITOR_ID;
    const QString sourceFile = VcsBase::VcsBaseEditorWidget::getSource(workingDirectory, QStringList());
    VcsBase::VcsBaseEditorWidget *editor = findExistingVCSEditor("logFileName", sourceFile);
    if (!editor)
        editor = createVcsEditor(editorId, title, sourceFile, CodecLogOutput, "logFileName", sourceFile, 0);
    executeGit(workingDirectory, arguments, editor);
}

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)
{
    if (!canShow(id)) {
        outputWindow()->append(msgCannotShow(id));
        return;
    }

    const QString title = tr("Git Show \"%1\"").arg(id);
    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;

    const QFileInfo sourceFi(source);
    const QString workDir = sourceFi.isDir() ? sourceFi.absoluteFilePath() : sourceFi.absolutePath();
    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, VcsBase::Command::NoReport, 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, true);
}

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"))