Implement git stash

Following operations are implemented in this change:
- Stash (with message)
- Pop / Pop last
- Apply / Apply last
- Drop
Signed-off-by: Waqar Ahmed <waqar.17a@gmail.com>

addons/project/CMakeLists.txt

@@ -63,6 +63,7 @@ target_sources(
     gitwidget.cpp
     gitstatusmodel.cpp
     gitcommitdialog.cpp
+    stashdialog.cpp
 
     tools/kateprojectcodeanalysistoolcppcheck.cpp
     tools/kateprojectcodeanalysistoolflake8.cpp

addons/project/gitwidget.cpp

@@ -7,6 +7,7 @@
 #include "gitcommitdialog.h"
 #include "gitstatusmodel.h"
 #include "kateproject.h"
+#include "stashdialog.h"
 
 #include <QContextMenuEvent>
 #include <QCoreApplication>
@@ -124,6 +125,11 @@ void GitWidget::sendMessage(const QString &message, bool warn)
     m_mainWin->activeView()->document()->postMessage(msg);
 }
 
+QProcess *GitWidget::gitprocess()
+{
+    return &git;
+}
+
 void GitWidget::getStatus(bool untracked, bool submodules)
 {
     disconnect(&git, &QProcess::finished, nullptr, nullptr);
@@ -446,6 +452,56 @@ void GitWidget::buildMenu()
         }
     });
     m_gitMenu->addAction(i18n("Checkout Branch"), this, &GitWidget::checkoutBranch);
+
+    m_gitMenu->addAction(i18n("Stash"))->setMenu(stashMenu());
+}
+
+QMenu *GitWidget::stashMenu()
+{
+    QMenu *menu = new QMenu(this);
+    auto stashAct = menu->addAction(i18n("Stash"));
+    auto popLastAct = menu->addAction(i18n("Pop Last Stash"));
+    auto popAct = menu->addAction(i18n("Pop Stash"));
+    auto applyLastAct = menu->addAction(i18n("Apply Last Stash"));
+    auto stashKeepStagedAct = menu->addAction(i18n("Stash (Keep Staged)"));
+    auto stashUAct = menu->addAction(i18n("Stash (Include Untracked)"));
+    auto applyStashAct = menu->addAction(i18n("Apply Stash"));
+    auto dropAct = menu->addAction(i18n("Drop Stash"));
+
+    connect(stashAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::Stash);
+    });
+    connect(stashUAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashUntrackIncluded);
+    });
+    connect(stashKeepStagedAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashKeepIndex);
+    });
+    connect(popAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashPop);
+    });
+    connect(applyStashAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashApply);
+    });
+    connect(dropAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashDrop);
+    });
+    connect(popLastAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashPopLast);
+    });
+    connect(applyLastAct, &QAction::triggered, this, [this] {
+        StashDialog stashDialog(this, m_mainWin);
+        stashDialog.openDialog(StashDialog::StashApplyLast);
+    });
+
+    return menu;
 }
 
 void GitWidget::treeViewContextMenuEvent(QContextMenuEvent *e)

addons/project/gitwidget.h

@@ -9,7 +9,6 @@
 #include <QFutureWatcher>
 #include <QProcess>
 #include <QWidget>
-#include <memory>
 
 #include "git/gitstatus.h"
 
@@ -37,6 +36,8 @@ public:
 
     bool eventFilter(QObject *o, QEvent *e) override;
     void getStatus(bool untracked = true, bool submodules = false);
+    void sendMessage(const QString &message, bool warn);
+    QProcess *gitprocess();
 
 private:
     QToolButton *m_menuBtn;
@@ -63,9 +64,10 @@ private:
     void clean(const QStringList &files);
     void openAtHEAD(const QString &file);
     void showDiff(const QString &file, bool staged);
+    void stash();
     void launchExternalDiffTool(const QString &file, bool staged);
     void commitChanges(const QString &msg, const QString &desc, bool signOff);
-    void sendMessage(const QString &message, bool warn);
+    QMenu *stashMenu();
 
     void hideEmptyTreeNodes();
     void treeViewContextMenuEvent(QContextMenuEvent *e);

addons/project/stashdialog.cpp

+/*
+    SPDX-FileCopyrightText: 2021 Waqar Ahmed <waqar.17a@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+#include "stashdialog.h"
+#include "git/gitutils.h"
+#include "gitwidget.h"
+
+#include <QCoreApplication>
+#include <QKeyEvent>
+#include <QLineEdit>
+#include <QPainter>
+#include <QProcess>
+#include <QSortFilterProxyModel>
+#include <QStandardItemModel>
+#include <QStyledItemDelegate>
+#include <QTextDocument>
+#include <QTreeView>
+#include <QVBoxLayout>
+#include <QWidget>
+#include <QtConcurrentRun>
+
+#include <KTextEditor/MainWindow>
+#include <KTextEditor/Message>
+#include <KTextEditor/View>
+
+#include <KLocalizedString>
+
+#include <kfts_fuzzy_match.h>
+
+constexpr int StashIndexRole = Qt::UserRole + 2;
+
+class StashFilterModel : public QSortFilterProxyModel
+{
+public:
+    StashFilterModel(QObject *parent = nullptr)
+        : QSortFilterProxyModel(parent)
+    {
+    }
+
+    Q_SLOT void setFilterString(const QString &string)
+    {
+        beginResetModel();
+        m_pattern = string;
+        endResetModel();
+    }
+
+protected:
+    bool lessThan(const QModelIndex &sourceLeft, const QModelIndex &sourceRight) const override
+    {
+        return sourceLeft.data(FuzzyScore).toInt() < sourceRight.data(FuzzyScore).toInt();
+    }
+
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override
+    {
+        if (m_pattern.isEmpty()) {
+            return true;
+        }
+
+        int score = 0;
+        const auto idx = sourceModel()->index(sourceRow, 0, sourceParent);
+        const QString string = idx.data().toString();
+        const bool res = kfts::fuzzy_match(m_pattern, string, score);
+        sourceModel()->setData(idx, score, FuzzyScore);
+        return res;
+    }
+
+private:
+    QString m_pattern;
+    static constexpr int FuzzyScore = Qt::UserRole + 1;
+};
+
+class StyleDelegate : public QStyledItemDelegate
+{
+public:
+    StyleDelegate(QObject *parent = nullptr)
+        : QStyledItemDelegate(parent)
+    {
+    }
+
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
+    {
+        QStyleOptionViewItem options = option;
+        initStyleOption(&options, index);
+
+        QString name = index.data().toString();
+
+        QVector<QTextLayout::FormatRange> formats;
+
+        int colon = name.indexOf(QLatin1Char(':'));
+        QString stashMessage = name.mid(colon + 1, name.length() - (colon + 1));
+        ++colon;
+
+        QTextCharFormat bold;
+        bold.setFontWeight(QFont::Bold);
+        formats.append({0, colon, bold});
+
+        QTextCharFormat fmt;
+        fmt.setForeground(options.palette.link());
+        fmt.setFontWeight(QFont::Bold);
+        auto resFmts = kfts::get_fuzzy_match_formats(m_filterString, stashMessage, colon, fmt);
+
+        formats.append(resFmts);
+
+        painter->save();
+
+        //        // paint background
+        if (option.state & QStyle::State_Selected) {
+            painter->fillRect(option.rect, option.palette.highlight());
+        } else {
+            painter->fillRect(option.rect, option.palette.base());
+        }
+
+        options.text = QString(); // clear old text
+        options.widget->style()->drawControl(QStyle::CE_ItemViewItem, &options, painter, options.widget);
+
+        kfts::paintItemViewText(painter, name, options, formats);
+
+        painter->restore();
+    }
+
+public Q_SLOTS:
+    void setFilterString(const QString &text)
+    {
+        m_filterString = text;
+    }
+
+private:
+    QString m_filterString;
+};
+
+StashDialog::StashDialog(QWidget *parent, KTextEditor::MainWindow *mainWindow)
+    : QMenu(parent)
+    , m_mainWindow(mainWindow)
+    , m_gitwidget(qobject_cast<GitWidget *>(parent))
+{
+    QVBoxLayout *layout = new QVBoxLayout();
+    layout->setSpacing(0);
+    layout->setContentsMargins(4, 4, 4, 4);
+    setLayout(layout);
+
+    m_lineEdit = new QLineEdit(this);
+    setFocusProxy(m_lineEdit);
+
+    layout->addWidget(m_lineEdit);
+
+    m_treeView = new QTreeView();
+    layout->addWidget(m_treeView, 1);
+    m_treeView->setTextElideMode(Qt::ElideLeft);
+    m_treeView->setUniformRowHeights(true);
+
+    m_model = new QStandardItemModel(this);
+
+    StyleDelegate *delegate = new StyleDelegate(this);
+    m_treeView->setItemDelegateForColumn(0, delegate);
+
+    m_proxyModel = new StashFilterModel(this);
+    m_proxyModel->setFilterRole(Qt::DisplayRole);
+
+    connect(m_lineEdit, &QLineEdit::returnPressed, this, &StashDialog::slotReturnPressed);
+    connect(m_lineEdit, &QLineEdit::textChanged, m_proxyModel, &StashFilterModel::setFilterString);
+    connect(m_lineEdit, &QLineEdit::textChanged, delegate, &StyleDelegate::setFilterString);
+    connect(m_lineEdit, &QLineEdit::textChanged, this, [this]() {
+        m_treeView->viewport()->update();
+        reselectFirst();
+    });
+    connect(m_treeView, &QTreeView::clicked, this, &StashDialog::slotReturnPressed);
+
+    m_proxyModel->setSourceModel(m_model);
+    m_treeView->setSortingEnabled(true);
+    m_treeView->setModel(m_proxyModel);
+
+    m_treeView->installEventFilter(this);
+    m_lineEdit->installEventFilter(this);
+
+    m_treeView->setHeaderHidden(true);
+    m_treeView->setRootIsDecorated(false);
+    m_treeView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_treeView->setSelectionMode(QTreeView::SingleSelection);
+}
+
+void StashDialog::openDialog(StashDialog::Mode m)
+{
+    m_model->clear();
+
+    switch (m) {
+    case Mode::Stash:
+    case Mode::StashKeepIndex:
+    case Mode::StashUntrackIncluded:
+        m_lineEdit->setPlaceholderText(i18n("Stash message (optional). Enter to confirm, Esc to leave."));
+        m_currentMode = m;
+        break;
+    case Mode::StashPop:
+    case Mode::StashDrop:
+    case Mode::StashApply:
+        m_lineEdit->setPlaceholderText(i18n("Type to filter, Enter to pop stash, Esc to leave."));
+        m_currentMode = m;
+        getStashList();
+        break;
+    case Mode::StashApplyLast:
+        applyStash({});
+        return;
+    case Mode::StashPopLast:
+        popStash({});
+        return;
+    default:
+        return;
+    }
+    reselectFirst();
+    updateViewGeometry();
+    setFocus();
+    exec();
+}
+
+bool StashDialog::eventFilter(QObject *obj, QEvent *event)
+{
+    // catch key presses + shortcut overrides to allow to have ESC as application wide shortcut, too, see bug 409856
+    if (event->type() == QEvent::KeyPress || event->type() == QEvent::ShortcutOverride) {
+        QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
+        if (obj == m_lineEdit) {
+            const bool forward2list = (keyEvent->key() == Qt::Key_Up) || (keyEvent->key() == Qt::Key_Down) || (keyEvent->key() == Qt::Key_PageUp)
+                || (keyEvent->key() == Qt::Key_PageDown);
+            if (forward2list) {
+                QCoreApplication::sendEvent(m_treeView, event);
+                return true;
+            }
+
+            if (keyEvent->key() == Qt::Key_Escape) {
+                m_lineEdit->clear();
+                keyEvent->accept();
+                hide();
+                return true;
+            }
+        } else {
+            const bool forward2input = (keyEvent->key() != Qt::Key_Up) && (keyEvent->key() != Qt::Key_Down) && (keyEvent->key() != Qt::Key_PageUp)
+                && (keyEvent->key() != Qt::Key_PageDown) && (keyEvent->key() != Qt::Key_Tab) && (keyEvent->key() != Qt::Key_Backtab);
+            if (forward2input) {
+                QCoreApplication::sendEvent(m_lineEdit, event);
+                return true;
+            }
+        }
+    }
+
+    // hide on focus out, if neither input field nor list have focus!
+    else if (event->type() == QEvent::FocusOut && !(m_lineEdit->hasFocus() || m_treeView->hasFocus())) {
+        m_lineEdit->clear();
+        hide();
+        return true;
+    }
+
+    return QWidget::eventFilter(obj, event);
+}
+
+void StashDialog::slotReturnPressed()
+{
+    switch (m_currentMode) {
+    case Mode::Stash:
+        stash(false, false);
+        break;
+    case Mode::StashKeepIndex:
+        stash(true, false);
+        break;
+    case Mode::StashUntrackIncluded:
+        stash(false, true);
+        break;
+    case Mode::StashApply:
+        applyStash(m_treeView->currentIndex().data(StashIndexRole).toByteArray());
+        break;
+    case Mode::StashPop:
+        popStash(m_treeView->currentIndex().data(StashIndexRole).toByteArray());
+        break;
+    case Mode::StashDrop:
+        dropStash(m_treeView->currentIndex().data(StashIndexRole).toByteArray());
+        break;
+    default:
+        break;
+    }
+
+    m_lineEdit->clear();
+    hide();
+}
+
+void StashDialog::reselectFirst()
+{
+    QModelIndex index = m_proxyModel->index(0, 0);
+    m_treeView->setCurrentIndex(index);
+}
+
+void StashDialog::sendMessage(const QString &message, bool warn)
+{
+    KTextEditor::Message *msg = new KTextEditor::Message(message, warn ? KTextEditor::Message::Warning : KTextEditor::Message::Positive);
+    msg->setPosition(KTextEditor::Message::TopInView);
+    msg->setAutoHide(3000);
+    msg->setAutoHideMode(KTextEditor::Message::Immediate);
+    msg->setView(m_mainWindow->activeView());
+    m_mainWindow->activeView()->document()->postMessage(msg);
+}
+
+void StashDialog::stash(bool keepIndex, bool includeUntracked)
+{
+    QStringList args{QStringLiteral("stash"), QStringLiteral("-q")};
+
+    if (keepIndex) {
+        args.append(QStringLiteral("--keep-index"));
+    }
+    if (includeUntracked) {
+        args.append(QStringLiteral("-u"));
+    }
+
+    if (!m_lineEdit->text().isEmpty()) {
+        args.append(QStringLiteral("-m"));
+        args.append(m_lineEdit->text());
+    }
+
+    auto git = m_gitwidget->gitprocess();
+    auto gitWidget = m_gitwidget;
+    if (!git) {
+        return;
+    }
+
+    disconnect(git, &QProcess::finished, nullptr, nullptr);
+    git->setArguments(args);
+    git->start();
+
+    connect(git, &QProcess::finished, m_gitwidget, [gitWidget](int exitCode, QProcess::ExitStatus es) {
+        if (es != QProcess::NormalExit || exitCode != 0) {
+            gitWidget->sendMessage(i18n("Failed to stash changes"), true);
+        } else {
+            gitWidget->getStatus();
+            gitWidget->sendMessage(i18n("Changes stashed successfully."), true);
+        }
+    });
+}
+
+void StashDialog::getStashList()
+{
+    auto git = m_gitwidget->gitprocess();
+    if (!git) {
+        return;
+    }
+
+    git->setArguments({QStringLiteral("stash"), QStringLiteral("list")});
+    git->start();
+
+    QList<QByteArray> stashList;
+    if (git->waitForStarted() && git->waitForFinished(-1)) {
+        if (git->exitStatus() == QProcess::NormalExit && git->exitCode() == 0) {
+            stashList = git->readAllStandardOutput().split('\n');
+        } else {
+            m_gitwidget->sendMessage(i18n("Failed to get stash list. Error:\n %1", QString::fromUtf8(git->readAllStandardError())), true);
+        }
+    }
+
+    // format stash@{}: message
+    for (const auto &stash : stashList) {
+        if (!stash.startsWith("stash@{")) {
+            continue;
+        }
+        int brackCloseIdx = stash.indexOf('}', 7);
+
+        if (brackCloseIdx < 0) {
+            continue;
+        }
+
+        QByteArray stashIdx = stash.mid(0, brackCloseIdx + 1);
+
+        QStandardItem *item = new QStandardItem(QString::fromUtf8(stash));
+        item->setData(stashIdx, StashIndexRole);
+        m_model->appendRow(item);
+    }
+}
+
+void StashDialog::popStash(const QByteArray &index, const QString &command)
+{
+    auto git = m_gitwidget->gitprocess();
+    auto gitWidget = m_gitwidget;
+    if (!git) {
+        return;
+    }
+
+    disconnect(git, &QProcess::finished, nullptr, nullptr);
+    QStringList args{QStringLiteral("stash"), command};
+    if (!index.isEmpty()) {
+        args.append(QString::fromUtf8(index));
+    }
+    git->setArguments(args);
+
+    git->start();
+
+    connect(git, &QProcess::finished, gitWidget, [gitWidget, command](int exitCode, QProcess::ExitStatus es) {
+        disconnect(gitWidget->gitprocess(), &QProcess::finished, nullptr, nullptr);
+        if (es != QProcess::NormalExit || exitCode != 0) {
+            auto git = gitWidget->gitprocess();
+            if (command == QLatin1String("apply")) {
+                gitWidget->sendMessage(i18n("Failed to apply stash. Error:\n%1", QString::fromUtf8(git->readAllStandardError())), true);
+            } else if (command == QLatin1String("drop")) {
+                gitWidget->sendMessage(i18n("Failed to drop stash. Error:\n%1", QString::fromUtf8(git->readAllStandardError())), true);
+            } else {
+                gitWidget->sendMessage(i18n("Failed to pop stash. Error:\n%1", QString::fromUtf8(git->readAllStandardError())), true);
+            }
+        } else {
+            gitWidget->getStatus();
+            if (command == QLatin1String("apply")) {
+                gitWidget->sendMessage(i18n("Stash applied successfully."), true);
+            } else if (command == QLatin1String("drop")) {
+                gitWidget->sendMessage(i18n("Stash dropped successfully."), true);
+            } else {
+                gitWidget->sendMessage(i18n("Stash popped successfully."), true);
+            }
+        }
+    });
+}
+
+void StashDialog::applyStash(const QByteArray &index)
+{
+    popStash(index, QStringLiteral("apply"));
+}
+
+void StashDialog::dropStash(const QByteArray &index)
+{
+    popStash(index, QStringLiteral("drop"));
+}
+
+void StashDialog::updateViewGeometry()
+{
+    m_treeView->resizeColumnToContents(0);
+    m_treeView->resizeColumnToContents(1);
+
+    QWidget *window = m_mainWindow->window();
+    const QSize centralSize = window->size();
+
+    // width: 2.4 of editor, height: 1/2 of editor
+    const QSize viewMaxSize(centralSize.width() / 2.4, centralSize.height() / 2);
+
+    const QSize widgetSize(centralSize.width() / 2.4, m_model->rowCount() == 0 ? m_lineEdit->sizeHint().height() * 2 : centralSize.height() / 2);
+
+    // Position should be central over window
+    const int xPos = std::max(0, (centralSize.width() - viewMaxSize.width()) / 2);
+    const int yPos = std::max(0, (centralSize.height() - viewMaxSize.height()) * 1 / 4);
+    const QPoint p(xPos, yPos);
+    move(p + window->pos());
+
+    this->setFixedSize(widgetSize);
+}

addons/project/stashdialog.h

+/*
+    SPDX-FileCopyrightText: 2021 Waqar Ahmed <waqar.17a@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+#include <QMenu>
+
+class QTreeView;
+class QLineEdit;
+class BranchesDialogModel;
+class QAction;
+class StashFilterModel;
+class KActionCollection;
+class QStandardItemModel;
+class QProcess;
+class GitWidget;
+
+namespace KTextEditor
+{
+class MainWindow;
+}
+
+namespace GitUtils
+{
+struct CheckoutResult;
+}
+
+class StashDialog : public QMenu
+{
+    Q_OBJECT
+public:
+    enum Mode { None, Stash, StashKeepIndex, StashUntrackIncluded, StashPopLast, StashPop, StashDrop, StashApply, StashApplyLast };
+
+    StashDialog(QWidget *parent, KTextEditor::MainWindow *mainWindow);
+
+    void openDialog(Mode mode);
+
+    void updateViewGeometry();
+
+    Q_SIGNAL void branchChanged(const QString &branch);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *event) override;
+