Basic integration of diff editor inside git plugin

Change-Id: I7675fc1d994020f94f42f6bd7b4f75aa29e6edf6
Reviewed-by: David Schulz <david.schulz@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/diffeditor/diffeditorfile.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** 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 DIFFEDITORFILE_H
+#define DIFFEDITORFILE_H
+
+#include "diffeditor_global.h"
+
+#include <coreplugin/idocument.h>
+
+namespace DiffEditor {
+
+class DiffEditorWidget;
+class DiffEditorFile;
+
+namespace Internal {
+
+class DiffEditorFile : public Core::IDocument
+{
+    Q_OBJECT
+public:
+    explicit DiffEditorFile(const QString &mimeType,
+                              QObject *parent = 0);
+
+    QString fileName() const { return m_fileName; }
+    QString defaultPath() const { return QString(); }
+    QString suggestedFileName() const { return QString(); }
+
+    bool isModified() const { return m_modified; }
+    QString mimeType() const;
+    bool isSaveAsAllowed() const { return false; }
+    bool save(QString *errorString, const QString &fileName, bool autoSave);
+    ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
+    bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
+    void rename(const QString &newName);
+
+    void setFileName(const QString &name);
+    void setModified(bool modified = true);
+
+signals:
+    void saveMe(QString *errorString, const QString &fileName, bool autoSave);
+
+private:
+    const QString m_mimeType;
+    bool m_modified;
+    QString m_fileName;
+};
+
+} // namespace Internal
+} // namespace DiffEditor
+
+#endif // DIFFEDITOREDITABLE_H