ClangFormat: Introduce check to format code instead of indenting

Ctrl+I with the new check will reformat the selected code or
the current line instead.

Change-Id: Ia5a72c4a09621034d0dfe463f669fe1ca36b0b5f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/clangformat/clangformatsettings.h

@@ -0,0 +1,44 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+namespace ClangFormat {
+
+class ClangFormatSettings
+{
+public:
+    static ClangFormatSettings &instance();
+
+    ClangFormatSettings();
+    void write() const;
+
+    void setFormatCodeInsteadOfIndent(bool enable);
+    bool formatCodeInsteadOfIndent() const;
+private:
+    bool m_formatCodeInsteadOfIndent = false;
+};
+
+} // namespace ClangFormat