Debug.h

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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2010-2011 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef SV_DEBUG_H
#define SV_DEBUG_H

#include <QDebug>
#include <QTextStream>
#include <QElapsedTimer>

#include "RealTime.h"

#include <string>
#include <iostream>
#include <fstream>

class QString;
class QUrl;

QDebug &operator<<(QDebug &, const std::string &);
std::ostream &operator<<(std::ostream &, const QString &);
std::ostream &operator<<(std::ostream &, const QUrl &);

using std::cout;
using std::cerr;
using std::endl;

class SVDebug {
public:
    SVDebug();
    ~SVDebug();

    template <typename T>
    inline SVDebug &operator<<(const T &t) {
        if (m_silenced) return *this;
        if (m_ok) {
            if (m_eol) {
                m_stream << m_prefix << "/" << m_timer.elapsed() << ": ";
            }
            m_stream << t;
            m_eol = false;
        }
        return *this;
    }

    inline SVDebug &operator<<(QTextStreamFunction) {
        if (m_silenced) return *this;
        m_stream << std::endl;
        m_eol = true;
        return *this;
    }

    static void silence() { m_silenced = true; }
    
private:
    std::fstream m_stream;
    char *m_prefix;
    bool m_ok;
    bool m_eol;
    QElapsedTimer m_timer;
    static bool m_silenced;
};

class SVCerr {
public:
    SVCerr(SVDebug &d) : m_d(d) { }
    
    template <typename T>
    inline SVCerr &operator<<(const T &t) {
        if (m_silenced) return *this;
        m_d << t;
        cerr << t;
        return *this;
    }

    inline SVCerr &operator<<(QTextStreamFunction f) {
        if (m_silenced) return *this;
        m_d << f;
        cerr << std::endl;
        return *this;
    }

    static void silence() { m_silenced = true; }
    
private:
    SVDebug &m_d;
    static bool m_silenced;
};

extern SVDebug &getSVDebug();
extern SVCerr &getSVCerr();

// Writes to debug log only
#define SVDEBUG getSVDebug()

// Writes to both SVDEBUG and cerr
#define SVCERR getSVCerr()

#endif /* !_DEBUG_H_ */