qtversionmanager.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
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**************************************************************************/

#include "qtversionmanager.h"

#include "qt4projectmanagerconstants.h"
#include "qt4target.h"
#include "profilereader.h"

#include "qt-maemo/maemomanager.h"
#include "qt-s60/s60manager.h"
#include "qt-s60/s60projectchecker.h"

#include <projectexplorer/debugginghelper.h>
#include <projectexplorer/projectexplorer.h>
#include <projectexplorer/projectexplorerconstants.h>
#include <projectexplorer/cesdkhandler.h>
#include <coreplugin/coreconstants.h>
#include <coreplugin/icore.h>
#include <extensionsystem/pluginmanager.h>
#include <help/helpmanager.h>
#include <utils/qtcassert.h>

#include <QtCore/QProcess>
#include <QtCore/QSettings>
#include <QtCore/QTime>
#include <QtCore/QTimer>
#include <QtCore/QTextStream>
#include <QtCore/QDir>
#include <QtGui/QApplication>
#include <QtGui/QDesktopServices>

#ifdef Q_OS_WIN32
#include <windows.h>
#endif

using namespace Qt4ProjectManager;
using namespace Qt4ProjectManager::Internal;

using ProjectExplorer::DebuggingHelperLibrary;

static const char *QtVersionsSectionName = "QtVersions";
static const char *newQtVersionsKey = "NewQtVersions";
static const char *PATH_AUTODETECTION_SOURCE = "PATH";

enum { debug = 0 };

QtVersionManager *QtVersionManager::m_self = 0;

QtVersionManager::QtVersionManager()
    : m_emptyVersion(new QtVersion)
{
    m_self = this;
    QSettings *s = Core::ICore::instance()->settings();

    m_idcount = 1;
    int size = s->beginReadArray(QtVersionsSectionName);
    for (int i = 0; i < size; ++i) {
        s->setArrayIndex(i);
        // Find the right id
        // Either something saved or something generated
        // Note: This code assumes that either all ids are read from the settings
        // or generated on the fly.
        int id = s->value("Id", -1).toInt();
        if (id == -1)
            id = getUniqueId();
        else if (m_idcount < id)
            m_idcount = id + 1;
        bool isAutodetected;
        QString autodetectionSource;
        if (s->contains("isAutodetected")) {
            isAutodetected = s->value("isAutodetected", false).toBool();
            autodetectionSource = s->value("autodetectionSource", QString()).toString();
        } else {// compatibility
            isAutodetected = s->value("IsSystemVersion", false).toBool();
            if (isAutodetected)
                autodetectionSource = QLatin1String(PATH_AUTODETECTION_SOURCE);
        }
        QString qmakePath = s->value("QMakePath").toString();
        if (qmakePath.isEmpty()) {
            QString path = s->value("Path").toString();
            if (!path.isEmpty()) {
                foreach(const QString& command, ProjectExplorer::DebuggingHelperLibrary::possibleQMakeCommands())
                {
                    QFileInfo fi(path + "/bin/" + command);
                    if (fi.exists())
                    {
                        qmakePath = fi.filePath();
                        break;
                    }
                }
            }
        }
        QtVersion *version = new QtVersion(s->value("Name").toString(),
                                           qmakePath,
                                           id,
                                           isAutodetected,
                                           autodetectionSource);
        version->setMingwDirectory(s->value("MingwDirectory").toString());
        version->setMsvcVersion(s->value("msvcVersion").toString());
        version->setMwcDirectory(s->value("MwcDirectory").toString());
        version->setS60SDKDirectory(s->value("S60SDKDirectory").toString());
        version->setGcceDirectory(s->value("GcceDirectory").toString());
        m_versions.append(version);
    }
    s->endArray();
    updateUniqueIdToIndexMap();

    ++m_idcount;
    addNewVersionsFromInstaller();
    updateSystemVersion();

    writeVersionsIntoSettings();

    updateDocumentation();

    // cannot call from ctor, needs to get connected extenernally first
    QTimer::singleShot(0, this, SLOT(updateExamples()));
}

QtVersionManager::~QtVersionManager()
{
    qDeleteAll(m_versions);
    m_versions.clear();
    delete m_emptyVersion;
    m_emptyVersion = 0;
}

QtVersionManager *QtVersionManager::instance()
{
    return m_self;
}

void QtVersionManager::addVersion(QtVersion *version)
{
    QTC_ASSERT(version != 0, return);
    if (m_versions.contains(version))
        return;

    m_versions.append(version);
    int uniqueId = version->uniqueId();
    m_uniqueIdToIndex.insert(uniqueId, m_versions.count() - 1);
    emit qtVersionsChanged(QList<int>() << uniqueId);
    writeVersionsIntoSettings();
}

void QtVersionManager::removeVersion(QtVersion *version)
{
    QTC_ASSERT(version != 0, return);
    m_versions.removeAll(version);
    int uniqueId = version->uniqueId();
    m_uniqueIdToIndex.remove(uniqueId);
    emit qtVersionsChanged(QList<int>() << uniqueId);
    writeVersionsIntoSettings();
    delete version;
}

bool QtVersionManager::supportsTargetId(const QString &id) const
{
    foreach (QtVersion *version, m_versions) {
        if (version->supportsTargetId(id))
            return true;
    }
    return false;
}

QList<QtVersion *> QtVersionManager::versionsForTargetId(const QString &id) const
{
    QList<QtVersion *> targetVersions;
    foreach (QtVersion *version, m_versions) {
        if (version->supportsTargetId(id))
            targetVersions.append(version);
    }
    return targetVersions;
}

QSet<QString> QtVersionManager::supportedTargetIds() const
{
    QSet<QString> results;
    foreach (QtVersion *version, m_versions)
        results.unite(version->supportedTargetIds());
    return results;
}

void QtVersionManager::updateDocumentation()
{
    Help::HelpManager *helpManager
        = ExtensionSystem::PluginManager::instance()->getObject<Help::HelpManager>();
    Q_ASSERT(helpManager);
    QStringList files;
    foreach (QtVersion *version, m_versions) {
        const QString docPath = version->documentationPath() + QLatin1String("/qch/");
        const QDir versionHelpDir(docPath);
        foreach (const QString &helpFile,
                versionHelpDir.entryList(QStringList() << QLatin1String("*.qch"), QDir::Files))
            files << docPath + helpFile;

    }
    helpManager->registerDocumentation(files);
}

void QtVersionManager::updateExamples()
{
    QList<QtVersion *> versions;
    versions.append(m_versions);

    QString examplesPath;
    QString demosPath;
    QtVersion *version = 0;
    // try to find a version which has both, demos and examples
    foreach (version, versions) {
        if (version->hasExamples())
            examplesPath = version->examplesPath();
        if (version->hasDemos())
            demosPath = version->demosPath();
        if (!examplesPath.isEmpty() && !demosPath.isEmpty()) {
            emit updateExamples(examplesPath, demosPath, version->sourcePath());
            return;
        }
    }
}

int QtVersionManager::getUniqueId()
{
    return m_idcount++;
}

void QtVersionManager::updateUniqueIdToIndexMap()
{
    m_uniqueIdToIndex.clear();
    for (int i = 0; i < m_versions.size(); ++i)
        m_uniqueIdToIndex.insert(m_versions.at(i)->uniqueId(), i);
}

void QtVersionManager::writeVersionsIntoSettings()
{
    QSettings *s = Core::ICore::instance()->settings();
    s->beginWriteArray(QtVersionsSectionName);
    for (int i = 0; i < m_versions.size(); ++i) {
        const QtVersion *version = m_versions.at(i);
        s->setArrayIndex(i);
        s->setValue("Name", version->displayName());
        // for downwards compat
        s->setValue("Path", version->versionInfo().value("QT_INSTALL_DATA"));
        s->setValue("QMakePath", version->qmakeCommand());
        s->setValue("Id", version->uniqueId());
        s->setValue("MingwDirectory", version->mingwDirectory());
        s->setValue("msvcVersion", version->msvcVersion());
        s->setValue("isAutodetected", version->isAutodetected());
        if (version->isAutodetected())
            s->setValue("autodetectionSource", version->autodetectionSource());
        s->setValue("MwcDirectory", version->mwcDirectory());
        s->setValue("S60SDKDirectory", version->s60SDKDirectory());
        s->setValue("GcceDirectory", version->gcceDirectory());
    }
    s->endArray();
}

QList<QtVersion *> QtVersionManager::versions() const
{
    return m_versions;
}

QList<QtVersion *> QtVersionManager::validVersions() const
{
    QList<QtVersion *> results;
    foreach(QtVersion *v, m_versions) {
        if (v->isValid())
            results.append(v);
    }
    return results;
}

bool QtVersionManager::isValidId(int id) const
{
    int pos = m_uniqueIdToIndex.value(id, -1);
    return (pos != -1);
}

QtVersion *QtVersionManager::version(int id) const
{
    int pos = m_uniqueIdToIndex.value(id, -1);
    if (pos != -1)
        return m_versions.at(pos);

    return m_emptyVersion;
}

void QtVersionManager::addNewVersionsFromInstaller()
{
    // Add new versions which may have been installed by the WB installer in the form:
    // NewQtVersions="qt 4.3.2=c:\\qt\\qt432\bin\qmake.exe;qt embedded=c:\\qtembedded;"
    // or NewQtVersions="qt 4.3.2=c:\\qt\\qt432bin\qmake.exe=c:\\qtcreator\\mingw\\=MSVCName;
    // i.e.
    // NewQtVersions="versionname=pathtoversion=mingw=s60sdk=gcce=carbide;"
    // Duplicate entries are not added, the first new version is set as default.
    QSettings *settings = Core::ICore::instance()->settings();
    QSettings *globalSettings = Core::ICore::instance()->settings(QSettings::SystemScope);

    QDateTime lastUpdateFromGlobalSettings = globalSettings->value(
            QLatin1String("General/LastQtVersionUpdate")).toDateTime();

    const QFileInfo gsFi(globalSettings->fileName());
    if ( !lastUpdateFromGlobalSettings.isNull() &&
         (!gsFi.exists() || (gsFi.lastModified() > lastUpdateFromGlobalSettings)) )
        return;

    if (!globalSettings->contains(newQtVersionsKey) &&
        !globalSettings->contains(QLatin1String("Installer/")+newQtVersionsKey))
    {
        return;
    }

    QString newVersionsValue = settings->value(newQtVersionsKey).toString();
    if (newVersionsValue.isEmpty())
        newVersionsValue = settings->value(QLatin1String("Installer/")+newQtVersionsKey).toString();

    QStringList newVersionsList = newVersionsValue.split(';', QString::SkipEmptyParts);
    foreach (const QString &newVersion, newVersionsList) {
        QStringList newVersionData = newVersion.split('=');
        if (newVersionData.count() >= 2) {
            if (QFile::exists(newVersionData[1])) {
                QtVersion *version = new QtVersion(newVersionData[0], newVersionData[1], m_idcount++ );
                if (newVersionData.count() >= 3)
                    version->setMingwDirectory(newVersionData[2]);
                if (newVersionData.count() >= 4)
                    version->setS60SDKDirectory(QDir::fromNativeSeparators(newVersionData[3]));
                if (newVersionData.count() >= 5)
                    version->setGcceDirectory(QDir::fromNativeSeparators(newVersionData[4]));
                if (newVersionData.count() >= 6)
                    version->setMwcDirectory(QDir::fromNativeSeparators(newVersionData[5]));
                if (newVersionData.count() >= 7)
                    version->setMsvcVersion(newVersionData[6]);

                bool versionWasAlreadyInList = false;
                foreach(const QtVersion * const it, m_versions) {
                    if (QDir(version->qmakeCommand()).canonicalPath() == QDir(it->qmakeCommand()).canonicalPath()) {
                        versionWasAlreadyInList = true;
                        break;
                    }
                }

                if (!versionWasAlreadyInList) {
                    m_versions.append(version);
                } else {
                    // clean up
                    delete version;
                }
            }
        }
    }
    updateUniqueIdToIndexMap();
    settings->setValue(QLatin1String("General/LastQtVersionUpdate"), QDateTime::currentDateTime());
}

void QtVersionManager::updateSystemVersion()
{
    bool haveSystemVersion = false;
    QString systemQMakePath = DebuggingHelperLibrary::findSystemQt(ProjectExplorer::Environment::systemEnvironment());
    if (systemQMakePath.isNull())
        systemQMakePath = tr("<not found>");

    foreach (QtVersion *version, m_versions) {
        if (version->isAutodetected()
            && version->autodetectionSource() == PATH_AUTODETECTION_SOURCE) {
            version->setQMakeCommand(systemQMakePath);
            version->setDisplayName(tr("Qt in PATH"));
            haveSystemVersion = true;
        }
    }
    if (haveSystemVersion)
        return;
    QtVersion *version = new QtVersion(tr("Qt in PATH"),
                                       systemQMakePath,
                                       getUniqueId(),
                                       true,
                                       PATH_AUTODETECTION_SOURCE);
    m_versions.prepend(version);
    updateUniqueIdToIndexMap();
}

QtVersion *QtVersionManager::emptyVersion() const
{
    return m_emptyVersion;
}

class SortByUniqueId
{
public:
    bool operator()(QtVersion *a, QtVersion *b)
    {
        return a->uniqueId() < b->uniqueId();
    }
};

bool QtVersionManager::equals(QtVersion *a, QtVersion *b)
{
    if (a->m_qmakeCommand != b->m_qmakeCommand)
        return false;
    if (a->m_id != b->m_id)
        return false;
    if (a->m_mingwDirectory != b->m_mingwDirectory
        || a->m_msvcVersion != b->m_msvcVersion
        || a->m_mwcDirectory != b->m_mwcDirectory)
        return false;
    if (a->m_displayName != b->displayName())
        return false;
    return true;
}

void QtVersionManager::setNewQtVersions(QList<QtVersion *> newVersions)
{
    // We want to preserve the same order as in the settings dialog
    // so we sort a copy
    QList<QtVersion *> sortedNewVersions = newVersions;
    SortByUniqueId sortByUniqueId;
    qSort(sortedNewVersions.begin(), sortedNewVersions.end(), sortByUniqueId);
    qSort(m_versions.begin(), m_versions.end(), sortByUniqueId);

    QList<int> changedVersions;
    // So we trying to find the minimal set of changed versions,
    // iterate over both sorted list

    // newVersions and oldVersions iterator
    QList<QtVersion *>::const_iterator nit, nend, oit, oend;
    nit = sortedNewVersions.constBegin();
    nend = sortedNewVersions.constEnd();
    oit = m_versions.constBegin();
    oend = m_versions.constEnd();

    while (nit != nend && oit != oend) {
        int nid = (*nit)->uniqueId();
        int oid = (*oit)->uniqueId();
        if (nid < oid) {
            changedVersions.push_back(nid);
            ++nit;
        } else if (oid < nid) {
            changedVersions.push_back(oid);
            ++oit;
        } else {
            if (!equals(*oit, *nit))
                changedVersions.push_back(oid);
            ++oit;
            ++nit;
        }
    }

    while (nit != nend) {
        changedVersions.push_back((*nit)->uniqueId());
        ++nit;
    }

    while (oit != oend) {
        changedVersions.push_back((*oit)->uniqueId());
        ++oit;
    }

    qDeleteAll(m_versions);
    m_versions.clear();
    m_versions = newVersions;

    if (!changedVersions.isEmpty())
        updateDocumentation();
    updateUniqueIdToIndexMap();

    updateExamples();
    writeVersionsIntoSettings();

    if (!changedVersions.isEmpty())
        emit qtVersionsChanged(changedVersions);
}

///
/// QtVersion
///

QtVersion::QtVersion(const QString &name, const QString &qmakeCommand, int id,
                     bool isAutodetected, const QString &autodetectionSource)
    : m_displayName(name),
    m_isAutodetected(isAutodetected),
    m_autodetectionSource(autodetectionSource),
    m_hasDebuggingHelper(false),
    m_toolChainUpToDate(false),
    m_versionInfoUpToDate(false),
    m_notInstalled(false),
    m_defaultConfigIsDebug(true),
    m_defaultConfigIsDebugAndRelease(true),
    m_hasExamples(false),
    m_hasDemos(false),
    m_hasDocumentation(false)
{
    if (id == -1)
        m_id = getUniqueId();
    else
        m_id = id;
    setQMakeCommand(qmakeCommand);
}

QtVersion::QtVersion(const QString &name, const QString &qmakeCommand,
                     bool isAutodetected, const QString &autodetectionSource)
    : m_displayName(name),
    m_isAutodetected(isAutodetected),
    m_autodetectionSource(autodetectionSource),
    m_hasDebuggingHelper(false),
    m_toolChainUpToDate(false),
    m_versionInfoUpToDate(false),
    m_notInstalled(false),
    m_defaultConfigIsDebug(true),
    m_defaultConfigIsDebugAndRelease(true),
    m_hasExamples(false),
    m_hasDemos(false),
    m_hasDocumentation(false)
{
    m_id = getUniqueId();
    setQMakeCommand(qmakeCommand);
}


QtVersion::QtVersion(const QString &qmakeCommand, bool isAutodetected, const QString &autodetectionSource)
    : m_isAutodetected(isAutodetected),
    m_autodetectionSource(autodetectionSource),
    m_hasDebuggingHelper(false),
    m_toolChainUpToDate(false),
    m_versionInfoUpToDate(false),
    m_notInstalled(false),
    m_defaultConfigIsDebug(true),
    m_defaultConfigIsDebugAndRelease(true),
    m_hasExamples(false),
    m_hasDemos(false),
    m_hasDocumentation(false)
{
    m_id = getUniqueId();
    setQMakeCommand(qmakeCommand);
    m_displayName = qtVersionString();
}

QtVersion::QtVersion()
    :  m_id(-1),
    m_isAutodetected(false),
    m_hasDebuggingHelper(false),
    m_toolChainUpToDate(false),
    m_versionInfoUpToDate(false),
    m_notInstalled(false),
    m_defaultConfigIsDebug(true),
    m_defaultConfigIsDebugAndRelease(true),
    m_hasExamples(false),
    m_hasDemos(false),
    m_hasDocumentation(false)
{
    setQMakeCommand(QString());
}


QtVersion::~QtVersion()
{
}

QString QtVersion::toHtml() const
{
    QString rc;
    QTextStream str(&rc);
    str << "<html></head><body><table>";
    str << "<tr><td><b>" << QtVersionManager::tr("Name:")
        << "</b></td><td>" << displayName() << "</td></tr>";
    str << "<tr><td><b>" << QtVersionManager::tr("Source:")
        << "</b></td><td>" << sourcePath() << "</td></tr>";
    str << "<tr><td><b>" << QtVersionManager::tr("mkspec:")
        << "</b></td><td>" << mkspec() << "</td></tr>";
    str << "<tr><td><b>" << QtVersionManager::tr("qmake:")
        << "</b></td><td>" << m_qmakeCommand << "</td></tr>";
    updateToolChainAndMkspec();
    if (m_defaultConfigIsDebug || m_defaultConfigIsDebugAndRelease) {
        str << "<tr><td><b>" << QtVersionManager::tr("Default:") << "</b></td><td>"
            << (m_defaultConfigIsDebug ? "debug" : "release");
        if (m_defaultConfigIsDebugAndRelease)
            str << " debug_and_release";
        str << "</td></tr>";
    } // default config.
    str << "<tr><td><b>" << QtVersionManager::tr("Version:")
        << "</b></td><td>" << qtVersionString() << "</td></tr>";
    if (hasDebuggingHelper())
        str << "<tr><td><b>" << QtVersionManager::tr("Debugging helper:")
            << "</b></td><td>" << debuggingHelperLibrary() << "</td></tr>";
    const QHash<QString,QString> vInfo = versionInfo();
    if (!vInfo.isEmpty()) {
        const QHash<QString,QString>::const_iterator vcend = vInfo.constEnd();
        for (QHash<QString,QString>::const_iterator it = vInfo.constBegin(); it != vcend; ++it)
            str << "<tr><td><pre>" << it.key() <<  "</pre></td><td>" << it.value() << "</td></tr>";
    }
    str << "<table></body></html>";
    return rc;
}

bool QtVersion::supportsShadowBuilds() const
{
    QSet<QString> targets = supportedTargetIds();
    // Symbian does not support shadow building
    if (targets.contains(Constants::S60_DEVICE_TARGET_ID) ||
        targets.contains(Constants::S60_EMULATOR_TARGET_ID)) {
	// We can not support shadow building with the ABLD system
        return false;
    }
    if (targets.contains(Constants::MAEMO_DEVICE_TARGET_ID)) {
#if defined(Q_OS_WIN)
        // qmake -unix fails with shadow building on windows
        return false;
#else
        // ... but works fine anywhere else
        return true;
#endif
    }

    return true;
}

QList<ProjectExplorer::Task>
QtVersion::reportIssues(const QString &proFile)
{
    QList<ProjectExplorer::Task> results;

    if (!isValid())
        results.append(ProjectExplorer::Task(ProjectExplorer::Task::Error,
                                             QObject::tr("The Qt version is invalid: %1",
                                                         "%1: Reason for being invalid").arg(invalidReason()),
                                             QString(), -1,
                                             QLatin1String(ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM)));

    QFileInfo qmakeInfo(qmakeCommand());
    if (!qmakeInfo.exists() ||
        !qmakeInfo.isExecutable())
        results.append(ProjectExplorer::Task(ProjectExplorer::Task::Error,
                                             QObject::tr("The qmake command \"%1\" was not found or is not executable.",
                                                         "%1: Path to qmake executable.").arg(qmakeCommand()),
                                             QString(), -1,
                                             QLatin1String(ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM)));

    QSet<QString> targets = supportedTargetIds();
    if (targets.contains(Constants::S60_DEVICE_TARGET_ID) ||
        targets.contains(Constants::S60_EMULATOR_TARGET_ID))
        results.append(S60ProjectChecker::reportIssues(proFile, this));
    return results;
}

QString QtVersion::displayName() const
{
    return m_displayName;
}

QString QtVersion::qmakeCommand() const
{
    return m_qmakeCommand;
}

QString QtVersion::sourcePath() const
{
    return m_sourcePath;
}

QString QtVersion::mkspec() const
{
    updateToolChainAndMkspec();
    return m_mkspec;
}

QString QtVersion::mkspecPath() const
{
    updateToolChainAndMkspec();
    return m_mkspecFullPath;
}

QString QtVersion::qtVersionString() const
{
    if (m_qtVersionString.isNull()) {
        QFileInfo qmake(m_qmakeCommand);
        if (qmake.exists() && qmake.isExecutable()) {
            m_qtVersionString = DebuggingHelperLibrary::qtVersionForQMake(qmake.absoluteFilePath());
        } else {
            m_qtVersionString = QLatin1String("");
        }
    }
    return m_qtVersionString;
}

QHash<QString,QString> QtVersion::versionInfo() const
{
    updateVersionInfo();
    return m_versionInfo;
}

void QtVersion::setDisplayName(const QString &name)
{
    m_displayName = name;
}

void QtVersion::setQMakeCommand(const QString& qmakeCommand)
{
    m_qmakeCommand = QDir::fromNativeSeparators(qmakeCommand);
#ifdef Q_OS_WIN
    m_qmakeCommand = m_qmakeCommand.toLower();
#endif
    m_designerCommand.clear();
    m_linguistCommand.clear();
    m_uicCommand.clear();
    m_toolChainUpToDate = false;
    // TODO do i need to optimize this?
    m_versionInfoUpToDate = false;
    m_qtVersionString = QString();
    updateSourcePath();
}

void QtVersion::updateSourcePath()
{
    updateVersionInfo();
    const QString installData = m_versionInfo["QT_INSTALL_DATA"];
    m_sourcePath = installData;
    QFile qmakeCache(installData + QLatin1String("/.qmake.cache"));
    if (qmakeCache.exists()) {
        qmakeCache.open(QIODevice::ReadOnly | QIODevice::Text);
        QTextStream stream(&qmakeCache);
        while (!stream.atEnd()) {
            QString line = stream.readLine().trimmed();
            if (line.startsWith(QLatin1String("QT_SOURCE_TREE"))) {
                m_sourcePath = line.split(QLatin1Char('=')).at(1).trimmed();
                if (m_sourcePath.startsWith(QLatin1String("$$quote("))) {
                    m_sourcePath.remove(0, 8);
                    m_sourcePath.chop(1);
                }
                break;
            }
        }
    }
    m_sourcePath = QDir::cleanPath(m_sourcePath);
#ifdef Q_OS_WIN
    m_sourcePath = m_sourcePath.toLower();
#endif
}

// Returns the version that was used to build the project in that directory
// That is returns the directory
// To find out whether we already have a qtversion for that directory call
// QtVersion *QtVersionManager::qtVersionForDirectory(const QString directory);
QString QtVersionManager::findQMakeBinaryFromMakefile(const QString &directory)
{
    bool debugAdding = false;
    QFile makefile(directory + "/Makefile" );
    if (makefile.exists() && makefile.open(QFile::ReadOnly)) {
        QTextStream ts(&makefile);
        QRegExp r1("QMAKE\\s*=(.*)");
        while (!ts.atEnd()) {
            QString line = ts.readLine();
            if (r1.exactMatch(line)) {
                if (debugAdding)
                    qDebug()<<"#~~ QMAKE is:"<<r1.cap(1).trimmed();
                QFileInfo qmake(r1.cap(1).trimmed());
                QString qmakePath = qmake.filePath();
#ifdef Q_OS_WIN
                qmakePath = qmakePath.toLower();
                if (!qmakePath.endsWith(QLatin1String(".exe")))
                    qmakePath.append(QLatin1String(".exe"));
#endif
                // Is qmake still installed?
                if (QFile::exists(qmakePath))
                    return qmakePath;
            }
        }
        makefile.close();
    }
    return QString();
}

QtVersion *QtVersionManager::qtVersionForQMakeBinary(const QString &qmakePath)
{
   foreach(QtVersion *v, versions()) {
        if (v->qmakeCommand() == qmakePath) {
            return v;
            break;
        }
    }
   return 0;
}

void dumpQMakeAssignments(const QList<QMakeAssignment> &list)
{
    foreach(const QMakeAssignment &qa, list) {
        qDebug()<<qa.variable<<qa.op<<qa.value;
    }
}

bool QtVersionManager::makefileIsFor(const QString &directory, const QString &proFile)
{
    if (proFile.isEmpty())
        return true;

    QString line = findQMakeLine(directory, QLatin1String("# Project:")).trimmed();
    if (line.isEmpty())
        return false;


    line = line.mid(line.indexOf(QChar(':')) + 1);
    line = line.trimmed();

    QFileInfo srcFileInfo(QDir(directory), line);
    QFileInfo proFileInfo(proFile);
    return srcFileInfo == proFileInfo;
}

QPair<QtVersion::QmakeBuildConfigs, QStringList> QtVersionManager::scanMakeFile(const QString &directory, QtVersion::QmakeBuildConfigs defaultBuildConfig)
{
    if (debug)
        qDebug()<<"ScanMakeFile, the gory details:";
    QtVersion::QmakeBuildConfigs result = defaultBuildConfig;
    QStringList result2;

    QString line = findQMakeLine(directory, QLatin1String("# Command:"));
    if (!line.isEmpty()) {
        if (debug)
            qDebug()<<"Found line"<<line;
        line = trimLine(line);
        QStringList parts = splitLine(line);
        if (debug)
            qDebug()<<"Split into"<<parts;
        QList<QMakeAssignment> assignments;
        QList<QMakeAssignment> afterAssignments;
        QStringList additionalArguments;
        parseParts(parts, &assignments, &afterAssignments, &additionalArguments);

        if (debug) {
            dumpQMakeAssignments(assignments);
            if (!afterAssignments.isEmpty())
                qDebug()<<"-after";
            dumpQMakeAssignments(afterAssignments);
        }

        // Search in assignments for CONFIG(+=,-=,=)(debug,release,debug_and_release)
        // Also remove them from the list
        result = qmakeBuildConfigFromCmdArgs(&assignments, defaultBuildConfig);

        if (debug)
            dumpQMakeAssignments(assignments);

        result2.append(additionalArguments);
        foreach(const QMakeAssignment &qa, assignments)
            result2.append(qa.variable + qa.op + qa.value);
        if (!afterAssignments.isEmpty()) {
            result2.append("-after");
            foreach(const QMakeAssignment &qa, afterAssignments)
                result2.append(qa.variable + qa.op + qa.value);
        }
    }

    // Dump the gathered information:
    if (debug) {
        qDebug()<<"\n\nDumping information from scanMakeFile";
        qDebug()<<"QMake CONFIG variable parsing";
        qDebug()<<"  "<< (result & QtVersion::NoBuild ? "No Build" : QString::number(int(result)));
        qDebug()<<"  "<< (result & QtVersion::DebugBuild ? "debug" : "release");
        qDebug()<<"  "<< (result & QtVersion::BuildAll ? "debug_and_release" : "no debug_and_release");
        qDebug()<<"\nAddtional Arguments";
        qDebug()<<result2;
        qDebug()<<"\n\n";
    }
    return qMakePair(result, result2);
}

QString QtVersionManager::findQMakeLine(const QString &directory, const QString &key)
{
    QFile makefile(directory + QLatin1String("/Makefile" ));
    if (makefile.exists() && makefile.open(QFile::ReadOnly)) {
        QTextStream ts(&makefile);
        while (!ts.atEnd()) {
            const QString line = ts.readLine();
            if (line.startsWith(key))
                return line;
        }
    }
    return QString();
}

/// This function trims the "#Command /path/to/qmake" from the the line
QString QtVersionManager::trimLine(const QString line)
{

    // Actually the first space after #Command: /path/to/qmake
    const int firstSpace = line.indexOf(QLatin1Char(' '), 11);
    return line.mid(firstSpace).trimmed();
}

QStringList QtVersionManager::splitLine(const QString &line)
{
    // Split on each " ", except on those which are escaped
    // On Unix also remove all escaping
    // On Windows also, but different escaping
    bool escape = false;
    QString currentWord;
    QStringList results;
    int length = line.length();
    for (int i=0; i<length; ++i) {
#ifdef Q_OS_WIN
        if (line.at(i) == '"') {
            escape = !escape;
        } else if (escape || line.at(i) != ' ') {
            currentWord += line.at(i);
        } else {
            results << currentWord;
            currentWord.clear();;
        }
#else
        if (escape) {
            currentWord += line.at(i);
            escape = false;
        } else if (line.at(i) == ' ') {
            results << currentWord;
            currentWord.clear();
        } else if (line.at(i) == '\\') {
            escape = true;
        } else {
            currentWord += line.at(i);
        }
#endif
    }
    return results;
}

void QtVersionManager::parseParts(const QStringList &parts, QList<QMakeAssignment> *assignments, QList<QMakeAssignment> *afterAssignments, QStringList *additionalArguments)
{
    QRegExp regExp("([^\\s\\+-]*)\\s*(\\+=|=|-=|~=)(.*)");
    bool after = false;
    bool ignoreNext = false;
    foreach (const QString &part, parts) {
        if (ignoreNext) {
            // Ignoring
            ignoreNext = false;
        } else if (part == "after") {
            after = true;
        } else if(part.contains('=')) {
            if (regExp.exactMatch(part)) {
                QMakeAssignment qa;
                qa.variable = regExp.cap(1);
                qa.op = regExp.cap(2);
                qa.value = regExp.cap(3).trimmed();
                if (after)
                    afterAssignments->append(qa);
                else
                    assignments->append(qa);
            } else {
                qDebug()<<"regexp did not match";
            }
        } else if (part == "-o") {
            ignoreNext = true;
        } else {
            additionalArguments->append(part);
        }
    }
#if defined(Q_OS_WIN32)
    additionalArguments->removeAll("-win32");
#elif defined(Q_OS_MAC)
    additionalArguments->removeAll("-macx");
#elif defined(Q_OS_QNX6)
    additionalArguments->removeAll("-qnx6");
#else
    additionalArguments->removeAll("-unix");
#endif
}

/// This function extracts all the CONFIG+=debug, CONFIG+=release
QtVersion::QmakeBuildConfigs QtVersionManager::qmakeBuildConfigFromCmdArgs(QList<QMakeAssignment> *assignments, QtVersion::QmakeBuildConfigs defaultBuildConfig)
{
    QtVersion::QmakeBuildConfigs result = defaultBuildConfig;
    QList<QMakeAssignment> oldAssignments = *assignments;
    assignments->clear();
    foreach(const QMakeAssignment &qa, oldAssignments) {
        if (qa.variable == "CONFIG") {
            QStringList values = qa.value.split(' ');
            QStringList newValues;