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diff --git a/src/lib/corelib/logging/logger.h b/src/lib/corelib/logging/logger.h
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+++ b/src/lib/corelib/logging/logger.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** 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 QBS_LOGGER_H
+#define QBS_LOGGER_H
+
+#include "ilogsink.h"
+
+#include <QByteArray>
+#include <QString>
+#include <QStringList>
+
+QT_BEGIN_NAMESPACE
+class QVariant;
+QT_END_NAMESPACE
+
+namespace qbs {
+namespace Internal {
+
+// Note that while these classes are not part of the API, we export some stuff for use by
+// our command line tools for the sake of a uniform logging approach.
+
+class QBS_EXPORT LogWriter
+{
+public:
+    LogWriter(ILogSink *logSink, LoggerLevel level, bool force = false);
+
+    // 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(char c);
+    void write(const char *str);
+    void write(const QChar &c);
+    void write(const QString &message);
+
+    void setMessageTag(const QString &tag);
+
+private:
+    ILogSink *m_logSink;
+    LoggerLevel m_level;
+    mutable QString m_message;
+    QString m_tag;
+    bool m_force;
+};
+
+class QBS_EXPORT MessageTag
+{
+public:
+    explicit MessageTag(const QString &tag) : m_tag(tag) {}
+
+    const QString &tag() const { return m_tag; }
+
+private:
+    QString m_tag;
+};
+
+QBS_EXPORT LogWriter operator<<(LogWriter w, const char *str);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const QByteArray &byteArray);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const QString &str);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const QStringList &strList);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const QSet<QString> &strSet);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const QVariant &variant);
+QBS_EXPORT LogWriter operator<<(LogWriter w, int n);
+QBS_EXPORT LogWriter operator<<(LogWriter w, qint64 n);
+QBS_EXPORT LogWriter operator<<(LogWriter w, bool b);
+QBS_EXPORT LogWriter operator<<(LogWriter w, const MessageTag &tag);
+
+class QBS_EXPORT Logger
+{
+public:
+    Logger(ILogSink *logSink = 0);
+
+    ILogSink *logSink() const { return m_logSink; }
+
+    bool debugEnabled() const;
+    bool traceEnabled() const;
+
+    void printWarning(const ErrorInfo &warning) { logSink()->printWarning(warning); }
+
+    LogWriter qbsLog(LoggerLevel level, bool force = false) const;
+    LogWriter qbsWarning() const { return qbsLog(LoggerWarning); }
+    LogWriter qbsInfo() const { return qbsLog(LoggerInfo); }
+    LogWriter qbsDebug() const { return qbsLog(LoggerDebug); }
+    LogWriter qbsTrace() const { return qbsLog(LoggerTrace); }
+
+private:
+    ILogSink *m_logSink;
+};
+
+
+class TimedActivityLogger
+{
+public:
+    TimedActivityLogger(const Logger &logger, const QString &activity,
+                        const QString &prefix = QString(), LoggerLevel logLevel = LoggerDebug,
+                        bool alwaysLog = false);
+    void finishActivity();
+    ~TimedActivityLogger();
+
+private:
+    class TimedActivityLoggerPrivate;
+    TimedActivityLoggerPrivate *d;
+};
+
+} // namespace Internal
+} // namespace qbs
+
+#endif // QBS_LOGGER_H