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diff --git a/src/lib/tools/logger.h b/src/lib/tools/logger.h
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+/**************************************************************************
+**
+** This file is part of the Qt Build Suite
+**
+** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file.
+** Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**************************************************************************/
+
+#ifndef LOGGER_H
+#define LOGGER_H
+
+#include <Qbs/globals.h>
+
+#include <Qbs/ilogsink.h>
+
+#include <QtCore/QByteArray>
+#include <QtCore/QString>
+#include <QtCore/QStringList>
+
+QT_BEGIN_NAMESPACE
+class QVariant;
+QT_END_NAMESPACE
+
+namespace qbs {
+
+class Logger
+{
+public:
+    static Logger &instance();
+
+    void setLevel(int level);
+    void setLevel(LoggerLevel level);
+    LoggerLevel level() const { return m_level; }
+    void print(LoggerLevel l, const LogMessage &message);
+
+    ~Logger();
+
+    void setLogSink(ILogSink *logSink);
+    void sendProcessOutput(const Qbs::ProcessOutput &processOutput);
+
+protected:
+    Logger();
+
+private:
+    ILogSink *m_logSink;
+    LoggerLevel m_level;
+};
+
+class LogWriter
+{
+public:
+    LogWriter(LoggerLevel level);
+
+    // log writer has move semantics and the last instance of
+    // a << chain prints the accumulated data
+    LogWriter(const LogWriter &other);
+    ~LogWriter();
+    const LogWriter &operator=(const LogWriter &other);
+
+    void write(const char c);
+    void write(const char *str);
+    void setOutputChannel(LogOutputChannel channel) { m_logMessage.outputChannel = channel; }
+    void setPrintLogLevel(bool b) { m_logMessage.printLogLevel = b; }
+    void setTextColor(TextColor color) { m_logMessage.textColor = color; }
+    const Qbs::LogMessage &logMessage() const { return m_logMessage; }
+
+private:
+    LoggerLevel m_level;
+    mutable Qbs::LogMessage m_logMessage;
+};
+
+enum LogModifier
+{
+    DontPrintLogLevel
+};
+
+} // namespace qbs
+
+inline bool qbsLogLevel(qbs::LoggerLevel l) { return qbs::Logger::instance().level() >= l; }
+void qbsLog(qbs::LoggerLevel logLevel, const char *str, ...);
+void qbsFatal(const char *str, ...);
+void qbsError(const char *str, ...);
+void qbsWarning(const char *str, ...);
+void qbsInfo(const char *str, ...);
+void qbsDebug(const char *str, ...);
+void qbsTrace(const char *str, ...);
+
+qbs::LogWriter qbsLog(qbs::LoggerLevel level);
+qbs::LogWriter qbsFatal();
+qbs::LogWriter qbsError();
+qbs::LogWriter qbsWarning();
+qbs::LogWriter qbsInfo();
+qbs::LogWriter qbsDebug();
+qbs::LogWriter qbsTrace();
+
+qbs::LogWriter operator<<(qbs::LogWriter w, const char *str);
+qbs::LogWriter operator<<(qbs::LogWriter w, const QByteArray &byteArray);
+qbs::LogWriter operator<<(qbs::LogWriter w, const QString &str);
+qbs::LogWriter operator<<(qbs::LogWriter w, const QStringList &strList);
+qbs::LogWriter operator<<(qbs::LogWriter w, const QSet<QString> &strSet);
+qbs::LogWriter operator<<(qbs::LogWriter w, const QVariant &variant);
+qbs::LogWriter operator<<(qbs::LogWriter w, int n);
+qbs::LogWriter operator<<(qbs::LogWriter w, qint64 n);
+qbs::LogWriter operator<<(qbs::LogWriter w, bool b);
+qbs::LogWriter operator<<(qbs::LogWriter w, qbs::LogOutputChannel);
+qbs::LogWriter operator<<(qbs::LogWriter w, qbs::LogModifier);
+qbs::LogWriter operator<<(qbs::LogWriter w, qbs::TextColor);
+
+#endif // LOGGER_H