annotate base/Debug.cpp @ 1376:d9511f9e04d7 dev/refactor-piper-related

Introduce some POD structs for describing an external server application and the desired libraries to load from it, and disambiguating between empty list request and invalid list request. This allows for overriding PiperVampPluginFactory behaviour for using a PluginScan to populate the list request.

/* -*- 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.
*/

#include "Debug.h"
#include "ResourceFinder.h"

#include <QMutex>
#include <QDir>
#include <QUrl>
#include <QCoreApplication>

#include <stdexcept>

static SVDebug *svdebug = 0;
static SVCerr *svcerr = 0;
static QMutex mutex;

SVDebug &getSVDebug() {
    mutex.lock();
    if (!svdebug) {
        svdebug = new SVDebug();
    }
    mutex.unlock();
    return *svdebug;
}

SVCerr &getSVCerr() {
    mutex.lock();
    if (!svcerr) {
        if (!svdebug) {
            svdebug = new SVDebug();
        }
        svcerr = new SVCerr(*svdebug);
    }
    mutex.unlock();
    return *svcerr;
}

bool SVDebug::m_silenced = false;
bool SVCerr::m_silenced = false;

SVDebug::SVDebug() :
    m_prefix(0),
    m_ok(false),
    m_eol(true)
{
    if (m_silenced) return;
    
    if (qApp->applicationName() == "") {
        cerr << "ERROR: Can't use SVDEBUG before setting application name" << endl;
        throw std::logic_error("Can't use SVDEBUG before setting application name");
    }
    
    QString pfx = ResourceFinder().getUserResourcePrefix();
    QDir logdir(QString("%1/%2").arg(pfx).arg("log"));

    m_prefix = strdup(QString("[%1]")
                      .arg(QCoreApplication::applicationPid())
                      .toLatin1().data());

    //!!! what to do if mkpath fails?
    if (!logdir.exists()) logdir.mkpath(logdir.path());

    QString fileName = logdir.path() + "/sv-debug.log";

    m_stream.open(fileName.toLocal8Bit().data(), std::ios_base::out);

    if (!m_stream) {
        QDebug(QtWarningMsg) << (const char *)m_prefix
                             << "Failed to open debug log file "
                             << fileName << " for writing";
    } else {
//        cerr << m_prefix << ": Log file is " << fileName << endl;
        m_ok = true;
    }
}

SVDebug::~SVDebug()
{
    if (m_stream) m_stream.close();
}

QDebug &
operator<<(QDebug &dbg, const std::string &s)
{
    dbg << QString::fromUtf8(s.c_str());
    return dbg;
}

std::ostream &
operator<<(std::ostream &target, const QString &str)
{
    return target << str.toStdString();
}

std::ostream &
operator<<(std::ostream &target, const QUrl &u)
{
    return target << "<" << u.toString().toStdString() << ">";
}