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#ifndef QBS_HOSTOSINFO_H
#define QBS_HOSTOSINFO_H

#include "qbs_export.h"
#include "stlutils.h"
#include "version.h"

#include <QtCore/qglobal.h>
#include <QtCore/qmap.h>
#include <QtCore/qsettings.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringlist.h>

#if defined(Q_OS_WIN)
#define QBS_HOST_EXE_SUFFIX ".exe"
#define QBS_HOST_DYNAMICLIB_PREFIX ""
#define QBS_HOST_DYNAMICLIB_SUFFIX ".dll"
#elif defined(Q_OS_DARWIN)
#define QBS_HOST_EXE_SUFFIX ""
#define QBS_HOST_DYNAMICLIB_PREFIX "lib"
#define QBS_HOST_DYNAMICLIB_SUFFIX ".dylib"
#else
#define QBS_HOST_EXE_SUFFIX ""
#define QBS_HOST_DYNAMICLIB_PREFIX "lib"
#define QBS_HOST_DYNAMICLIB_SUFFIX ".so"
#endif // Q_OS_WIN

namespace qbs {
namespace Internal {

class QBS_EXPORT HostOsInfo // Exported for use by command-line tools.
{
public:
    // Add more as needed.
    enum HostOs { HostOsWindows, HostOsLinux, HostOsMacos, HostOsOtherUnix, HostOsOther };

    static inline std::string hostOSIdentifier();
    static inline std::string hostOSArchitecture();
    static inline std::vector<std::string> hostOSIdentifiers();
    static inline std::vector<std::string> canonicalOSIdentifiers(const std::string &os);
    static inline HostOs hostOs();

    static inline Version hostOsVersion() {
        Version v;
        if (HostOsInfo::isWindowsHost()) {
            QSettings settings(QStringLiteral("HKEY_LOCAL_MACHINE\\Software\\"
                                                   "Microsoft\\Windows NT\\CurrentVersion"),
                               QSettings::NativeFormat);
            v = v.fromString(settings.value(QStringLiteral("CurrentVersion")).toString() +
                             QLatin1Char('.') +
                             settings.value(QStringLiteral("CurrentBuildNumber")).toString());
            Q_ASSERT(v.isValid());
        } else if (HostOsInfo::isMacosHost()) {
            QSettings settings(QStringLiteral("/System/Library/CoreServices/SystemVersion.plist"),
                               QSettings::NativeFormat);
            v = v.fromString(settings.value(QStringLiteral("ProductVersion")).toString());
            Q_ASSERT(v.isValid());
        }
        return v;
    }

    static bool isWindowsHost() { return hostOs() == HostOsWindows; }
    static bool isLinuxHost() { return hostOs() == HostOsLinux; }
    static bool isMacosHost() { return hostOs() == HostOsMacos; }
    static inline bool isAnyUnixHost();
    static inline QString rfc1034Identifier(const QString &str);

    static QString appendExecutableSuffix(const QString &executable)
    {
        QString finalName = executable;
        if (isWindowsHost())
            finalName += QLatin1String(QBS_HOST_EXE_SUFFIX);
        return finalName;
    }

    static QString stripExecutableSuffix(const QString &executable)
    {
        constexpr QLatin1String suffix(QBS_HOST_EXE_SUFFIX, sizeof(QBS_HOST_EXE_SUFFIX) - 1);
        return !suffix.isEmpty() && executable.endsWith(suffix)
            ? executable.chopped(suffix.size()) : executable;
    }

    static QString dynamicLibraryName(const QString &libraryBaseName)
    {
        return QLatin1String(QBS_HOST_DYNAMICLIB_PREFIX) + libraryBaseName
                + QLatin1String(QBS_HOST_DYNAMICLIB_SUFFIX);
    }

    static Qt::CaseSensitivity fileNameCaseSensitivity()
    {
        return isWindowsHost() ? Qt::CaseInsensitive: Qt::CaseSensitive;
    }

    static QString libraryPathEnvironmentVariable()
    {
        if (isWindowsHost())
            return QStringLiteral("PATH");
        if (isMacosHost())
            return QStringLiteral("DYLD_LIBRARY_PATH");
        return QStringLiteral("LD_LIBRARY_PATH");
    }

    static QChar pathListSeparator(HostOsInfo::HostOs hostOs = HostOsInfo::hostOs())
    {
        return hostOs == HostOsWindows ? QLatin1Char(';') : QLatin1Char(':');
    }

    static QChar pathSeparator(HostOsInfo::HostOs hostOs = HostOsInfo::hostOs())
    {
        return hostOs == HostOsWindows ? QLatin1Char('\\') : QLatin1Char('/');
    }

    static Qt::KeyboardModifier controlModifier()
    {
        return isMacosHost() ? Qt::MetaModifier : Qt::ControlModifier;
    }
};

std::string HostOsInfo::hostOSIdentifier()
{
#if defined(__APPLE__)
    return "macos";
#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
    return "windows";
#elif defined(_AIX)
    return "aix";
#elif defined(hpux) || defined(__hpux)
    return "hpux";
#elif defined(__sun) || defined(sun)
    return "solaris";
#elif defined(__linux__) || defined(__linux)
    return "linux";
#elif defined(__FreeBSD__) || defined(__DragonFly__) || defined(__FreeBSD_kernel__)
    return "freebsd";
#elif defined(__NetBSD__)
    return "netbsd";
#elif defined(__OpenBSD__)
    return "openbsd";
#elif defined(__GNU__)
    return "hurd";
#elif defined(__HAIKU__)
    return "haiku";
#else
    #warning "Qbs has not been ported to this OS - see http://qbs.io/"
    return "";
#endif
}

std::string HostOsInfo::hostOSArchitecture()
{
    const auto cpuArch = QSysInfo::currentCpuArchitecture();
    if (cpuArch == QLatin1String("i386"))
        return "x86";
    return cpuArch.toStdString();
}

std::vector<std::string> HostOsInfo::hostOSIdentifiers()
{
    return canonicalOSIdentifiers(hostOSIdentifier());
}

std::vector<std::string> HostOsInfo::canonicalOSIdentifiers(const std::string &name)
{
    std::vector<std::string> list { name };
    if (contains({"ios-simulator"}, name))
        list << canonicalOSIdentifiers("ios");
    if (contains({"tvos-simulator"}, name))
        list << canonicalOSIdentifiers("tvos");
    if (contains({"watchos-simulator"}, name))
        list << canonicalOSIdentifiers("watchos");
    if (contains({"macos", "ios", "tvos", "watchos"}, name))
        list << canonicalOSIdentifiers("darwin");
    if (contains({"darwin", "freebsd", "netbsd", "openbsd"}, name))
        list << canonicalOSIdentifiers("bsd");
    if (contains({"android"}, name))
        list << canonicalOSIdentifiers("linux");

    // Note: recognized non-Unix platforms include: windows, haiku, vxworks
    if (contains({"bsd", "aix", "hpux", "solaris", "linux", "hurd", "qnx", "integrity"}, name))
        list << canonicalOSIdentifiers("unix");

    return list;
}

HostOsInfo::HostOs HostOsInfo::hostOs()
{
#if defined(Q_OS_WIN)
    return HostOsWindows;
#elif defined(Q_OS_LINUX)
    return HostOsLinux;
#elif defined(Q_OS_DARWIN)
    return HostOsMacos;
#elif defined(Q_OS_UNIX)
    return HostOsOtherUnix;
#else
    return HostOsOther;
#endif
}

bool HostOsInfo::isAnyUnixHost()
{
#ifdef Q_OS_UNIX
    return true;
#else
    return false;
#endif
}

QString HostOsInfo::rfc1034Identifier(const QString &str)
{
    QString s = str;
    for (QChar &ch : s) {
        const char c = ch.toLatin1();

        const bool okChar = (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z')
                || (c >= 'a' && c <= 'z') || c == '-' || c == '.';
        if (!okChar)
            ch = QChar::fromLatin1('-');
    }
    return s;
}

} // namespace Internal
} // namespace qbs

#endif // QBS_HOSTOSINFO_H
