1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of Qbs. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef FILESAVER_H 41 #define FILESAVER_H 42 43 #include "qbs_export.h" 44 45 #include <memory> 46 #include <sstream> 47 #include <string> 48 #include <vector> 49 50 namespace qbs { 51 namespace Internal { 52 53 /*! 54 * QSaveFile wrapper which doesn't update the target file if the contents are unchanged. 55 */ 56 class QBS_EXPORT FileSaver { 57 public: 58 FileSaver(std::string filePath, bool overwriteIfUnchanged = false); 59 60 std::ostream *device(); 61 bool open(); 62 bool commit(); 63 bool write(std::string_view data); 64 65 private: 66 std::string m_oldFileContents; 67 std::shared_ptr<std::stringstream> m_memoryDevice; 68 const std::string m_filePath; 69 const bool m_overwriteIfUnchanged; 70 }; 71 72 } // namespace Internal 73 } // namespace qbs 74 75 #endif // FILESAVER_H 76