/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@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.
**
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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**************************************************************************/

#include "pkgconfigtool.h"

#include <QtCore/QProcess>
#include <QtCore/QTextStream>
#include <QtCore/QtDebug>

using namespace GenericProjectManager::Internal;

PkgConfigTool::PkgConfigTool()
{ }

PkgConfigTool::~PkgConfigTool()
{ }

QList<PkgConfigTool::Package> PkgConfigTool::packages() const
{
    if (m_packages.isEmpty())
        packages_helper();

    return m_packages;
}

void PkgConfigTool::packages_helper() const
{
    QStringList args;
    args.append(QLatin1String("--list-all"));

    QProcess pkgconfig;
    pkgconfig.start(QLatin1String("pkg-config"), args);
    while (! pkgconfig.waitForFinished()) {
    }

    QTextStream in(&pkgconfig);
    forever {
        const QString line = in.readLine();

        if (line.isNull())
            break;

        else if (line.isEmpty())
            continue;

        int i = 0;
        for (; i != line.length(); ++i) {
            if (line.at(i).isSpace())
                break;
        }

        Package package;
        package.name = line.left(i).trimmed();
        package.description = line.mid(i).trimmed();

        QStringList args;
        args << package.name << QLatin1String("--cflags");
        pkgconfig.start(QLatin1String("pkg-config"), args);

        while (! pkgconfig.waitForFinished()) {
        }

        const QString cflags = QString::fromUtf8(pkgconfig.readAll());

        int index = 0;
        while (index != cflags.size()) {
            const QChar ch = cflags.at(index);

            if (ch.isSpace()) {
                do { ++index; }
                while (index < cflags.size() && cflags.at(index).isSpace());
            }

            else if (ch == QLatin1Char('-') && index + 1 < cflags.size()) {
                ++index;

                const QChar opt = cflags.at(index);

                if (opt == QLatin1Char('I')) {
                    // include paths.

                    int start = ++index;
                    for (; index < cflags.size(); ++index) {
                        if (cflags.at(index).isSpace())
                            break;
                    }

                    qDebug() << "*** add include path:" << cflags.mid(start, index - start);
                    package.includePaths.append(cflags.mid(start, index - start));
                }
            }

            else {
                for (; index < cflags.size(); ++index) {
                    if (cflags.at(index).isSpace())
                        break;
                }
            }
        }

        m_packages.append(package);
    }
}
