Add EmacsKeys plugin.

A very simple non-intrusive plugin. Adds a bunch of actions typical emacs user
would expect. Doesn't contain any default key bindings.

Change-Id: Ib30fb46c577e2fdfd4c704e7f4eee7ee27a53c29
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/emacskeys/emacskeysplugin.h

@@ -0,0 +1,111 @@
+/**************************************************************************
+**
+** Copyright (c) nsf <no.smile.face@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+** GNU Lesser General Public License Usage
+** 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
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef EMACSKEYS_H
+#define EMACSKEYS_H
+
+#include <extensionsystem/iplugin.h>
+
+#include <QTextCursor>
+
+// forward declarations
+QT_FORWARD_DECLARE_CLASS(QAction)
+QT_FORWARD_DECLARE_CLASS(QPlainTextEdit)
+
+namespace Core {
+class Id;
+class IEditor;
+}
+namespace TextEditor {
+class BaseTextEditorWidget;
+}
+
+namespace EmacsKeys {
+namespace Internal {
+
+class EmacsKeysState;
+
+class EmacsKeysPlugin : public ExtensionSystem::IPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "EmacsKeys.json")
+
+public:
+    EmacsKeysPlugin();
+    ~EmacsKeysPlugin();
+
+    bool initialize(const QStringList &arguments, QString *errorString);
+    void extensionsInitialized();
+    ShutdownFlag aboutToShutdown();
+
+private slots:
+    void editorAboutToClose(Core::IEditor *editor);
+    void currentEditorChanged(Core::IEditor *editor);
+
+    void deleteCharacter();       // C-d
+    void killWord();              // M-d
+    void killLine();              // C-k
+    void insertLineAndIndent();   // C-j
+
+    void gotoFileStart();         // M-<
+    void gotoFileEnd();           // M->
+    void gotoLineStart();         // C-a
+    void gotoLineEnd();           // C-e
+    void gotoNextLine();          // C-n
+    void gotoPreviousLine();      // C-p
+    void gotoNextCharacter();     // C-f
+    void gotoPreviousCharacter(); // C-b
+    void gotoNextWord();          // M-f
+    void gotoPreviousWord();      // M-b
+
+    void mark();                  // C-SPC
+    void exchangeCursorAndMark(); // C-x C-x
+    void copy();                  // M-w
+    void cut();                   // C-w
+    void yank();                  // C-y
+
+    void scrollHalfDown();        // C-v
+    void scrollHalfUp();          // M-v
+
+private:
+    QAction *registerAction(const Core::Id &id, const char *slot,
+        const QString &title);
+    void genericGoto(QTextCursor::MoveOperation op, bool abortAssist = true);
+    void genericVScroll(int direction);
+
+    QHash<QPlainTextEdit*, EmacsKeysState*> m_stateMap;
+    QPlainTextEdit *m_currentEditorWidget;
+    EmacsKeysState *m_currentState;
+    TextEditor::BaseTextEditorWidget *m_currentBaseTextEditorWidget;
+};
+
+} // namespace Internal
+} // namespace EmacsKeys
+
+#endif // EMACSKEYS_H