fakevimplugin.cpp 63.4 KB
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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
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****************************************************************************/
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#include "fakevimplugin.h"

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#include "fakevimhandler.h"
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#include "ui_fakevimoptions.h"

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#include <coreplugin/actionmanager/actioncontainer.h>
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#include <coreplugin/actionmanager/actionmanager.h>
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#include <coreplugin/actionmanager/command.h>
#include <coreplugin/actionmanager/command.h>
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#include <coreplugin/actionmanager/commandmappings.h>
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#include <coreplugin/coreconstants.h>
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#include <coreplugin/dialogs/ioptionspage.h>
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#include <coreplugin/editormanager/editormanager.h>
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#include <coreplugin/editormanager/openeditorsmodel.h>
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#include <coreplugin/documentmanager.h>
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#include <coreplugin/icore.h>
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#include <coreplugin/idocument.h>
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#include <coreplugin/messagemanager.h>
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#include <coreplugin/id.h>
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#include <coreplugin/statusbarwidget.h>
#include <coreplugin/statusbarmanager.h>
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#include <projectexplorer/projectexplorerconstants.h>

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#include <texteditor/basetextdocumentlayout.h>
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#include <texteditor/basetexteditor.h>
#include <texteditor/basetextmark.h>
#include <texteditor/texteditorconstants.h>
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#include <texteditor/typingsettings.h>
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#include <texteditor/tabsettings.h>
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#include <texteditor/icodestylepreferences.h>
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#include <texteditor/texteditorsettings.h>
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#include <texteditor/indenter.h>
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#include <texteditor/codeassist/basicproposalitem.h>
#include <texteditor/codeassist/basicproposalitemlistmodel.h>
#include <texteditor/codeassist/completionassistprovider.h>
#include <texteditor/codeassist/iassistprocessor.h>
#include <texteditor/codeassist/iassistinterface.h>
#include <texteditor/codeassist/genericproposal.h>
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#include <find/findplugin.h>
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#include <find/textfindconstants.h>
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#include <find/ifindsupport.h>
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#include <utils/qtcassert.h>
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#include <utils/savedaction.h>
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#include <utils/treewidgetcolumnstretcher.h>
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#include <utils/stylehelper.h>
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#include <cpptools/cpptoolsconstants.h>

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#include <extensionsystem/pluginmanager.h>

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#include <QAbstractTableModel>
#include <QDebug>
#include <QFile>
#include <QtPlugin>
#include <QObject>
#include <QSettings>
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#include <QStackedWidget>
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#include <QTextStream>
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#include <QDesktopServices>
#include <QItemDelegate>
#include <QMessageBox>
#include <QPlainTextEdit>
#include <QShortcut>
#include <QTextBlock>
#include <QTextCursor>
#include <QTextEdit>
#include <QTreeWidgetItem>
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using namespace TextEditor;
using namespace Core;

namespace FakeVim {
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namespace Internal {
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const char INSTALL_HANDLER[]                = "TextEditor.FakeVimHandler";
const char SETTINGS_CATEGORY[]              = "D.FakeVim";
const char SETTINGS_CATEGORY_FAKEVIM_ICON[] = ":/core/images/category_fakevim.png";
const char SETTINGS_ID[]                    = "A.General";
const char SETTINGS_EX_CMDS_ID[]            = "B.ExCommands";
const char SETTINGS_USER_CMDS_ID[]          = "C.UserCommands";
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class MiniBuffer : public QStackedWidget
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{
    Q_OBJECT

public:
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    MiniBuffer() : m_label(new QLabel(this)), m_edit(new QLineEdit(this)), m_eventFilter(0)
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    {
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        m_edit->installEventFilter(this);
        connect(m_edit, SIGNAL(textEdited(QString)), SLOT(changed()));
        connect(m_edit, SIGNAL(cursorPositionChanged(int,int)), SLOT(changed()));
        m_label->setTextInteractionFlags(Qt::TextSelectableByMouse);

        addWidget(m_label);
        addWidget(m_edit);
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    }

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    void setContents(const QString &contents, int cursorPos, int messageLevel, QObject *eventFilter)
    {
        if (cursorPos != -1) {
            m_edit->blockSignals(true);
            m_label->clear();
            m_edit->setText(contents);
            m_edit->setCursorPosition(cursorPos);
            m_edit->blockSignals(false);

            setCurrentWidget(m_edit);
            m_edit->setFocus();
        } else {
            m_label->setText(messageLevel == MessageMode ? "-- " + contents + " --" : contents);

            QString css;
            if (messageLevel == MessageError) {
                css = QString("border:1px solid rgba(255,255,255,150);"
                              "background-color:rgba(255,0,0,100);");
            } else if (messageLevel == MessageWarning) {
                css = QString("border:1px solid rgba(255,255,255,120);"
                              "background-color:rgba(255,255,0,20);");
            }
            m_label->setStyleSheet(QString(
                "*{border-radius:2px;padding-left:4px;padding-right:4px;%1}").arg(css));
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            if (m_edit->hasFocus())
                emit edited(QString(), -1);

            setCurrentWidget(m_label);
        }

        if (m_eventFilter != eventFilter) {
            if (m_eventFilter != 0) {
                m_edit->removeEventFilter(m_eventFilter);
                disconnect(SIGNAL(edited(QString,int)));
            }
            if (eventFilter != 0) {
                m_edit->installEventFilter(eventFilter);
                connect(this, SIGNAL(edited(QString,int)),
                        eventFilter, SLOT(miniBufferTextEdited(QString,int)));
            }
            m_eventFilter = eventFilter;
        }
    }

    QSize sizeHint() const
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    {
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        QSize size = QWidget::sizeHint();
        // reserve maximal width for line edit widget
        return currentWidget() == m_edit ? QSize(maximumWidth(), size.height()) : size;
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    }
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signals:
    void edited(const QString &text, int cursorPos);

private slots:
    void changed()
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    {
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        emit edited(m_edit->text(), m_edit->cursorPosition());
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    }
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    bool eventFilter(QObject *ob, QEvent *ev)
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    {
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        // cancel editing on escape
        if (m_eventFilter != 0 && ob == m_edit && ev->type() == QEvent::ShortcutOverride
            && static_cast<QKeyEvent*>(ev)->key() == Qt::Key_Escape) {
            emit edited(QString(), -1);
            ev->accept();
            return true;
        }
        return false;
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    }
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private:
    QLabel *m_label;
    QLineEdit *m_edit;
    QObject *m_eventFilter;
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};

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///////////////////////////////////////////////////////////////////////
//
// FakeVimOptionPage
//
///////////////////////////////////////////////////////////////////////

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typedef QMap<QString, QRegExp> ExCommandMap;
typedef QMap<int, QString> UserCommandMap;
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typedef QLatin1String _;
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class FakeVimOptionPage : public IOptionsPage
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{
    Q_OBJECT

public:
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    FakeVimOptionPage()
    {
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        setId(_(SETTINGS_ID));
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        setDisplayName(tr("General"));
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        setCategory(_(SETTINGS_CATEGORY));
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        setDisplayCategory(tr("FakeVim"));
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        setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
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    }
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    QWidget *createPage(QWidget *parent);
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    void apply() { m_group.apply(ICore::settings()); }
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    void finish() { m_group.finish(); }
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    virtual bool matches(const QString &) const;
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private slots:
    void copyTextEditorSettings();
    void setQtStyle();
    void setPlainStyle();

private:
    friend class DebuggerPlugin;
    Ui::FakeVimOptionPage m_ui;
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    QString m_searchKeywords;
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    Utils::SavedActionSet m_group;
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};

QWidget *FakeVimOptionPage::createPage(QWidget *parent)
{
    QWidget *w = new QWidget(parent);
    m_ui.setupUi(w);

    m_group.clear();
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    m_group.insert(theFakeVimSetting(ConfigUseFakeVim),
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        m_ui.checkBoxUseFakeVim);
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    m_group.insert(theFakeVimSetting(ConfigReadVimRc),
        m_ui.checkBoxReadVimRc);
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    m_group.insert(theFakeVimSetting(ConfigExpandTab),
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        m_ui.checkBoxExpandTab);
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    m_group.insert(theFakeVimSetting(ConfigHlSearch),
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        m_ui.checkBoxHlSearch);
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    m_group.insert(theFakeVimSetting(ConfigShiftWidth),
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        m_ui.spinBoxShiftWidth);
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    m_group.insert(theFakeVimSetting(ConfigShowMarks),
        m_ui.checkBoxShowMarks);
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    m_group.insert(theFakeVimSetting(ConfigSmartTab),
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        m_ui.checkBoxSmartTab);
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    m_group.insert(theFakeVimSetting(ConfigStartOfLine),
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        m_ui.checkBoxStartOfLine);
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    m_group.insert(theFakeVimSetting(ConfigTabStop),
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        m_ui.spinBoxTabStop);
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    m_group.insert(theFakeVimSetting(ConfigBackspace),
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        m_ui.lineEditBackspace);
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    m_group.insert(theFakeVimSetting(ConfigIsKeyword),
        m_ui.lineEditIsKeyword);
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    m_group.insert(theFakeVimSetting(ConfigPassControlKey),
        m_ui.checkBoxPassControlKey);
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    m_group.insert(theFakeVimSetting(ConfigAutoIndent),
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        m_ui.checkBoxAutoIndent);
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    m_group.insert(theFakeVimSetting(ConfigSmartIndent),
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        m_ui.checkBoxSmartIndent);
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    m_group.insert(theFakeVimSetting(ConfigIncSearch),
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        m_ui.checkBoxIncSearch);
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    m_group.insert(theFakeVimSetting(ConfigUseCoreSearch),
        m_ui.checkBoxUseCoreSearch);
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    m_group.insert(theFakeVimSetting(ConfigSmartCase),
        m_ui.checkBoxSmartCase);
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    m_group.insert(theFakeVimSetting(ConfigWrapScan),
        m_ui.checkBoxWrapScan);
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    connect(m_ui.pushButtonCopyTextEditorSettings, SIGNAL(clicked()),
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        SLOT(copyTextEditorSettings()));
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    connect(m_ui.pushButtonSetQtStyle, SIGNAL(clicked()),
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        SLOT(setQtStyle()));
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    connect(m_ui.pushButtonSetPlainStyle, SIGNAL(clicked()),
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        SLOT(setPlainStyle()));

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    if (m_searchKeywords.isEmpty()) {
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        QLatin1Char sep(' ');
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        QTextStream(&m_searchKeywords)
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                << sep << m_ui.checkBoxUseFakeVim->text()
                << sep << m_ui.checkBoxReadVimRc->text()
                << sep << m_ui.checkBoxAutoIndent->text()
                << sep << m_ui.checkBoxSmartIndent->text()
                << sep << m_ui.checkBoxExpandTab->text()
                << sep << m_ui.checkBoxSmartTab->text()
                << sep << m_ui.checkBoxHlSearch->text()
                << sep << m_ui.checkBoxIncSearch->text()
                << sep << m_ui.checkBoxStartOfLine->text()
                << sep << m_ui.checkBoxUseCoreSearch->text()
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                << sep << m_ui.checkBoxSmartCase->text()
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                << sep << m_ui.checkBoxShowMarks->text()
                << sep << m_ui.checkBoxPassControlKey->text()
                << sep << m_ui.labelShiftWidth->text()
                << sep << m_ui.labelTabulator->text()
                << sep << m_ui.labelBackspace->text()
                << sep << m_ui.labelIsKeyword->text();
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        m_searchKeywords.remove(QLatin1Char('&'));
    }
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    return w;
}

void FakeVimOptionPage::copyTextEditorSettings()
{
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    TabSettings ts = TextEditorSettings::instance()->codeStyle()->tabSettings();
    TypingSettings tps = TextEditorSettings::instance()->typingSettings();
    m_ui.checkBoxExpandTab->setChecked(ts.m_tabPolicy != TabSettings::TabsOnlyTabPolicy);
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    m_ui.spinBoxTabStop->setValue(ts.m_tabSize);
    m_ui.spinBoxShiftWidth->setValue(ts.m_indentSize);
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    m_ui.checkBoxSmartTab->setChecked(
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        tps.m_smartBackspaceBehavior == TypingSettings::BackspaceFollowsPreviousIndents);
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    m_ui.checkBoxAutoIndent->setChecked(true);
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    m_ui.checkBoxSmartIndent->setChecked(tps.m_autoIndent);
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    m_ui.checkBoxIncSearch->setChecked(true);
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}

void FakeVimOptionPage::setQtStyle()
{
    m_ui.checkBoxExpandTab->setChecked(true);
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    m_ui.spinBoxTabStop->setValue(4);
    m_ui.spinBoxShiftWidth->setValue(4);
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    m_ui.checkBoxSmartTab->setChecked(true);
    m_ui.checkBoxAutoIndent->setChecked(true);
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    m_ui.checkBoxSmartIndent->setChecked(true);
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    m_ui.checkBoxIncSearch->setChecked(true);
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    m_ui.lineEditBackspace->setText(_("indent,eol,start"));
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}

void FakeVimOptionPage::setPlainStyle()
{
    m_ui.checkBoxExpandTab->setChecked(false);
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    m_ui.spinBoxTabStop->setValue(8);
    m_ui.spinBoxShiftWidth->setValue(8);
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    m_ui.checkBoxSmartTab->setChecked(false);
    m_ui.checkBoxAutoIndent->setChecked(false);
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    m_ui.checkBoxSmartIndent->setChecked(false);
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    m_ui.checkBoxIncSearch->setChecked(false);
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    m_ui.lineEditBackspace->setText(QString());
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}

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bool FakeVimOptionPage::matches(const QString &s) const
{
    return m_searchKeywords.contains(s, Qt::CaseInsensitive);
}

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//const char *FAKEVIM_CONTEXT = "FakeVim";
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///////////////////////////////////////////////////////////////////////
//
// FakeVimExCommandsPage
//
///////////////////////////////////////////////////////////////////////

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enum { CommandRole = Qt::UserRole };
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class FakeVimExCommandsPage : public CommandMappings
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{
    Q_OBJECT

public:
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    FakeVimExCommandsPage(FakeVimPluginPrivate *q)
        : m_q(q)
    {
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        setId(_(SETTINGS_EX_CMDS_ID));
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        setDisplayName(tr("Ex Command Mapping"));
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        setCategory(_(SETTINGS_CATEGORY));
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        setDisplayCategory(tr("FakeVim"));
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        setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
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    }
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    QWidget *createPage(QWidget *parent);
    void initialize();
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    ExCommandMap &exCommandMap();
    ExCommandMap &defaultExCommandMap();
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public slots:
    void commandChanged(QTreeWidgetItem *current);
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    void targetIdentifierChanged();
    void resetTargetIdentifier();
    void removeTargetIdentifier();
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    void defaultAction();

private:
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    FakeVimPluginPrivate *m_q;
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};

QWidget *FakeVimExCommandsPage::createPage(QWidget *parent)
{
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    QWidget *w = CommandMappings::createPage(parent);
    setPageTitle(tr("Ex Command Mapping"));
    setTargetHeader(tr("Ex Trigger Expression"));
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    setTargetLabelText(tr("Regular expression:"));
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    setTargetEditTitle(tr("Ex Command"));
    setImportExportEnabled(false);
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    return w;
}

void FakeVimExCommandsPage::initialize()
{
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    QMap<QString, QTreeWidgetItem *> sections;

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    foreach (Command *c, ActionManager::commands()) {
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        if (c->action() && c->action()->isSeparator())
            continue;

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        QTreeWidgetItem *item = new QTreeWidgetItem;
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        const QString name = c->id().toString();
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        const int pos = name.indexOf(QLatin1Char('.'));
        const QString section = name.left(pos);
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        const QString subId = name.mid(pos + 1);
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        item->setData(0, CommandRole, name);
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        if (!sections.contains(section)) {
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            QTreeWidgetItem *categoryItem =
                new QTreeWidgetItem(commandList(), QStringList() << section);
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            QFont f = categoryItem->font(0);
            f.setBold(true);
            categoryItem->setFont(0, f);
            sections.insert(section, categoryItem);
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            commandList()->expandItem(categoryItem);
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        }
        sections[section]->addChild(item);

        item->setText(0, subId);
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        item->setText(1, c->description());
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        QString regex;
        if (exCommandMap().contains(name))
            regex = exCommandMap()[name].pattern();
        item->setText(2, regex);
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        if (regex != defaultExCommandMap()[name].pattern())
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            setModified(item, true);
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    }

    commandChanged(0);
}

void FakeVimExCommandsPage::commandChanged(QTreeWidgetItem *current)
{
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    CommandMappings::commandChanged(current);
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    if (current)
        targetEdit()->setText(current->text(2));
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}

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void FakeVimExCommandsPage::targetIdentifierChanged()
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{
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    QTreeWidgetItem *current = commandList()->currentItem();
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    if (!current)
        return;

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    const QString name =  current->data(0, CommandRole).toString();
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    const QString regex = targetEdit()->text();
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    if (current->data(0, Qt::UserRole).isValid()) {
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        current->setText(2, regex);
        exCommandMap()[name] = QRegExp(regex);
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    }
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    setModified(current, regex != defaultExCommandMap()[name].pattern());
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}

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void FakeVimExCommandsPage::resetTargetIdentifier()
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{
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    QTreeWidgetItem *current = commandList()->currentItem();
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    if (!current)
        return;
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    const QString name = current->data(0, CommandRole).toString();
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    QString regex;
    if (defaultExCommandMap().contains(name))
        regex = defaultExCommandMap()[name].pattern();
    targetEdit()->setText(regex);
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}

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void FakeVimExCommandsPage::removeTargetIdentifier()
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{
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    targetEdit()->clear();
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}

void FakeVimExCommandsPage::defaultAction()
{
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    int n = commandList()->topLevelItemCount();
    for (int i = 0; i != n; ++i) {
        QTreeWidgetItem *section = commandList()->topLevelItem(i);
        int m = section->childCount();
        for (int j = 0; j != m; ++j) {
            QTreeWidgetItem *item = section->child(j);
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            const QString name = item->data(0, CommandRole).toString();
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            QString regex;
            if (defaultExCommandMap().contains(name))
                regex = defaultExCommandMap()[name].pattern();
            setModified(item, false);
            item->setText(2, regex);
            if (item == commandList()->currentItem())
                commandChanged(item);
        }
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    }
}

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///////////////////////////////////////////////////////////////////////
//
// FakeVimUserCommandsPage
//
///////////////////////////////////////////////////////////////////////

class FakeVimUserCommandsModel : public QAbstractTableModel
{
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    Q_OBJECT
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public:
    FakeVimUserCommandsModel(FakeVimPluginPrivate *q) : m_q(q) {}
    ~FakeVimUserCommandsModel() {}

    int rowCount(const QModelIndex &parent) const;
    int columnCount(const QModelIndex &parent) const;
    QVariant data(const QModelIndex &index, int role) const;
    bool setData(const QModelIndex &index, const QVariant &data, int role);
    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
    Qt::ItemFlags flags(const QModelIndex &index) const;

private:
    FakeVimPluginPrivate *m_q;
};

int FakeVimUserCommandsModel::rowCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : 9;
}

int FakeVimUserCommandsModel::columnCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : 2;
}


QVariant FakeVimUserCommandsModel::headerData(int section,
    Qt::Orientation orient, int role) const
{
    if (orient == Qt::Horizontal && role == Qt::DisplayRole) {
        switch (section) {
            case 0: return tr("Action");
            case 1: return tr("Command");
        };
    }
    return QVariant();
}

Qt::ItemFlags FakeVimUserCommandsModel::flags(const QModelIndex &index) const
{
    if (index.column() == 1)
        return QAbstractTableModel::flags(index) | Qt::ItemIsEditable;
    return QAbstractTableModel::flags(index);
}

class FakeVimUserCommandsDelegate : public QItemDelegate
{
public:
    explicit FakeVimUserCommandsDelegate(QObject *parent)
        : QItemDelegate(parent)
    {}

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
        const QModelIndex &) const
    {
        QLineEdit *lineEdit = new QLineEdit(parent);
        lineEdit->setFrame(false);
        return lineEdit;
    }

    void setModelData(QWidget *editor, QAbstractItemModel *model,
                      const QModelIndex &index) const
    {
        QLineEdit *lineEdit = qobject_cast<QLineEdit *>(editor);
        QTC_ASSERT(lineEdit, return);
        model->setData(index, lineEdit->text(), Qt::EditRole);
    }
};

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class FakeVimUserCommandsPage : public IOptionsPage
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{
    Q_OBJECT

public:
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    FakeVimUserCommandsPage(FakeVimPluginPrivate *q)
        : m_q(q)
    {
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        setId(_(SETTINGS_USER_CMDS_ID));
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        setDisplayName(tr("User Command Mapping"));
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        setCategory(_(SETTINGS_CATEGORY));
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        setDisplayCategory(tr("FakeVim"));
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        setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
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    }

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    void apply();
    void finish() {}

    QWidget *createPage(QWidget *parent);
    void initialize() {}
    UserCommandMap &userCommandMap();
    UserCommandMap &defaultUserCommandMap();

private:
    FakeVimPluginPrivate *m_q;
};

QWidget *FakeVimUserCommandsPage::createPage(QWidget *parent)
{
    QGroupBox *box = new QGroupBox(parent);

    FakeVimUserCommandsModel *model = new FakeVimUserCommandsModel(m_q);
    QTreeView *widget = new QTreeView;
    widget->setModel(model);
    widget->resizeColumnToContents(0);

    FakeVimUserCommandsDelegate *delegate = new FakeVimUserCommandsDelegate(widget);
    widget->setItemDelegateForColumn(1, delegate);

    QGridLayout *layout = new QGridLayout(box);
    layout->addWidget(widget, 0, 0);
    box->setLayout(layout);

    return box;
}

void FakeVimUserCommandsPage::apply()
{
    //m_q->writeSettings();
}

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///////////////////////////////////////////////////////////////////////
//
// WordCompletion
//
///////////////////////////////////////////////////////////////////////

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class FakeVimCompletionAssistProvider : public CompletionAssistProvider
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{
public:
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    bool supportsEditor(const Id &) const
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    {
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        return false;
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    }

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    IAssistProcessor *createProcessor() const;
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    void setActive(const QString &needle, bool forward, FakeVimHandler *handler)
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    {
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        Q_UNUSED(forward);
        m_handler = handler;
        if (!m_handler)
            return;

        BaseTextEditorWidget *editor = qobject_cast<BaseTextEditorWidget *>(handler->widget());
        if (!editor)
            return;

        //qDebug() << "ACTIVATE: " << needle << forward;
        m_needle = needle;
        editor->invokeAssist(Completion, this);
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    }

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    void setInactive()
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    {
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        m_needle.clear();
        m_handler = 0;
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    }

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    const QString &needle() const
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    {
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        return m_needle;
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    }
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    void appendNeedle(const QChar &c)
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    {
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        m_needle.append(c);
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    }

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    FakeVimHandler *handler() const
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    {
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        return m_handler;
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    }
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private:
    FakeVimHandler *m_handler;
    QString m_needle;
};

class FakeVimAssistProposalItem : public BasicProposalItem
{
public:
    FakeVimAssistProposalItem(const FakeVimCompletionAssistProvider *provider)
        : m_provider(const_cast<FakeVimCompletionAssistProvider *>(provider))
    {}

    virtual bool implicitlyApplies() const
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    {
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        return false;
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    }

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    virtual bool prematurelyApplies(const QChar &c) const
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    {
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        m_provider->appendNeedle(c);
        return text() == m_provider->needle();
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    }

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    virtual void applyContextualContent(BaseTextEditor *, int) const
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    {
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        QTC_ASSERT(m_provider->handler(), return);
        m_provider->handler()->handleReplay(text().mid(m_provider->needle().size()));
        const_cast<FakeVimCompletionAssistProvider *>(m_provider)->setInactive();
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    }

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private:
    FakeVimCompletionAssistProvider *m_provider;
};


class FakeVimAssistProposalModel : public BasicProposalItemListModel
{
public:
    FakeVimAssistProposalModel(const QList<BasicProposalItem *> &items)
        : BasicProposalItemListModel(items)
    {}

    virtual bool supportsPrefixExpansion() const
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    {
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        return false;
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    }
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};
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class FakeVimCompletionAssistProcessor : public IAssistProcessor
{
public:
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    FakeVimCompletionAssistProcessor(const IAssistProvider *provider)
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        : m_provider(static_cast<const FakeVimCompletionAssistProvider *>(provider))
    {}

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    IAssistProposal *perform(const IAssistInterface *interface)
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    {
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        const QString &needle = m_provider->needle();

        const int basePosition = interface->position() - needle.size();

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        QTextCursor tc(interface->textDocument());
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        tc.setPosition(interface->position());
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        tc.movePosition(QTextCursor::Start, QTextCursor::MoveAnchor);

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        QList<BasicProposalItem *> items;
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        QSet<QString> seen;
        QTextDocument::FindFlags flags = QTextDocument::FindCaseSensitively;
        while (1) {
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            tc = tc.document()->find(needle, tc.position(), flags);
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            if (tc.isNull())
                break;
            QTextCursor sel = tc;
            sel.select(QTextCursor::WordUnderCursor);
            QString found = sel.selectedText();
            // Only add "real" completions.
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            if (found.startsWith(needle)
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                    && !seen.contains(found)
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                    && sel.anchor() != basePosition) {
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                seen.insert(found);
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                BasicProposalItem *item = new FakeVimAssistProposalItem(m_provider);
                item->setText(found);
                items.append(item);
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            }
            tc.movePosition(QTextCursor::Right, QTextCursor::MoveAnchor);
        }
        //qDebug() << "COMPLETIONS" << completions->size();

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        delete interface;
        return new GenericProposal(basePosition, new FakeVimAssistProposalModel(items));
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    }

private:
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    const FakeVimCompletionAssistProvider *m_provider;
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};
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IAssistProcessor *FakeVimCompletionAssistProvider::createProcessor() const
{
    return new FakeVimCompletionAssistProcessor(this);
}

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///////////////////////////////////////////////////////////////////////
//
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// FakeVimPluginPrivate
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//
///////////////////////////////////////////////////////////////////////

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class FakeVimPluginPrivate : public QObject
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{
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    Q_OBJECT

public:
    FakeVimPluginPrivate(FakeVimPlugin *);
    ~FakeVimPluginPrivate();
    friend class FakeVimPlugin;
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    friend class FakeVimExCommandsPage;
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    friend class FakeVimUserCommandsPage;
    friend class FakeVimUserCommandsModel;
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    bool initialize();
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    void aboutToShutdown();
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private slots:
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    void onCoreAboutToClose();
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    void editorOpened(Core::IEditor *);
    void editorAboutToClose(Core::IEditor *);
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    void setUseFakeVim(const QVariant &value);
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    void setUseFakeVimInternal(bool on);
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    void quitFakeVim();
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    void triggerCompletions();
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    void triggerSimpleCompletions(const QString &needle, bool forward);
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    void windowCommand(int key);
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    void find(bool reverse);
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    void findNext(bool reverse);
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    void foldToggle(int depth);
    void foldAll(bool fold);
    void fold(int depth, bool fold);
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    void showSettingsDialog();
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    void maybeReadVimRc();
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    void setBlockSelection(bool);
    void hasBlockSelection(bool*);
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    void resetCommandBuffer();
    void showCommandBuffer(const QString &contents, int cursorPos, int messageLevel,
                           QObject *eventFilter);
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    void showExtraInformation(const QString &msg);
    void changeSelection(const QList<QTextEdit::ExtraSelection> &selections);
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    void highlightMatches(const QString &needle);
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    void moveToMatchingParenthesis(bool *moved, bool *forward, QTextCursor *cursor);
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    void checkForElectricCharacter(bool *result, QChar c);
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    void indentRegion(int beginLine, int endLine, QChar typedChar);
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    void handleExCommand(bool *handled, const ExCommand &cmd);
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    void writeSettings();
    void readSettings();

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    void handleDelayedQuitAll(bool forced);
    void handleDelayedQuit(bool forced, Core::IEditor *editor);
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    void userActionTriggered();
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    void switchToFile(int n);
    int currentFile() const;
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signals:
    void delayedQuitRequested(bool forced, Core::IEditor *editor);
    void delayedQuitAllRequested(bool forced);
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private:
    FakeVimPlugin *q;
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    FakeVimOptionPage *m_fakeVimOptionsPage;
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