static int updateVersionHelper(const QString &command)
{
    Utils::SynchronousProcess process;
    Utils::SynchronousProcessResponse response
            = process.runBlocking(command, QStringList() << QLatin1String("--version"));
    if (response.result != Utils::SynchronousProcessResponse::Finished)
        return 0;

    // Astyle prints the version on stdout or stderr, depending on platform
    const int version = parseVersion(response.stdOut().trimmed());
    if (version != 0)
        return version;
    return parseVersion(response.stdErr().trimmed());
}
ClangExecutableVersion clangExecutableVersion(const QString &executable)
{
    const ClangExecutableVersion invalidVersion;

    // Sanity checks
    const QFileInfo fileInfo(executable);
    const bool isExecutableFile = fileInfo.isFile() && fileInfo.isExecutable();
    if (!isExecutableFile)
        return invalidVersion;

    // Get version output
    Utils::Environment environment = Utils::Environment::systemEnvironment();
    Utils::Environment::setupEnglishOutput(&environment);
    Utils::SynchronousProcess runner;
    runner.setEnvironment(environment.toStringList());
    runner.setTimeoutS(10);
    // We would prefer "-dumpversion", but that one returns some old version number.
    const QStringList arguments(QLatin1String(("--version")));
    const Utils::SynchronousProcessResponse response = runner.runBlocking(executable, arguments);
    if (response.result != Utils::SynchronousProcessResponse::Finished)
        return invalidVersion;
    const QString output = response.stdOut();

    // Parse version output
    const QRegularExpression re(QLatin1String("clang version (\\d+)\\.(\\d+)\\.(\\d+)"));
    const QRegularExpressionMatch reMatch = re.match(output);
    if (re.captureCount() != 3)
        return invalidVersion;

    const QString majorString = reMatch.captured(1);
    bool convertedSuccessfully = false;
    const int major = majorString.toInt(&convertedSuccessfully);
    if (!convertedSuccessfully)
        return invalidVersion;

    const QString minorString = reMatch.captured(2);
    const int minor = minorString.toInt(&convertedSuccessfully);
    if (!convertedSuccessfully)
        return invalidVersion;

    const QString patchString = reMatch.captured(3);
    const int patch = patchString.toInt(&convertedSuccessfully);
    if (!convertedSuccessfully)
        return invalidVersion;

    return ClangExecutableVersion(major, minor, patch);
}
void ArtisticStyleSettings::createDocumentationFile() const
{
    Utils::SynchronousProcess process;
    process.setTimeoutS(2);
    Utils::SynchronousProcessResponse response
            = process.runBlocking(command(), QStringList() << QLatin1String("-h"));
    if (response.result != Utils::SynchronousProcessResponse::Finished)
        return;

    QFile file(documentationFilePath());
    const QFileInfo fi(file);
    if (!fi.exists())
        fi.dir().mkpath(fi.absolutePath());
    if (!file.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text))
        return;

    bool contextWritten = false;
    QXmlStreamWriter stream(&file);
    stream.setAutoFormatting(true);
    stream.writeStartDocument("1.0", true);
    stream.writeComment("Created " + QDateTime::currentDateTime().toString(Qt::ISODate));
    stream.writeStartElement(Constants::DOCUMENTATION_XMLROOT);

    // astyle writes its output to 'error'...
    const QStringList lines = response.stdErr().split(QLatin1Char('\n'));
    QStringList keys;
    QStringList docu;
    for (QString line : lines) {
        line = line.trimmed();
        if ((line.startsWith("--") && !line.startsWith("---")) || line.startsWith("OR ")) {
            const QStringList rawKeys = line.split(" OR ", QString::SkipEmptyParts);
            for (QString k : rawKeys) {
                k = k.trimmed();
                k.remove('#');
                keys << k;
                if (k.startsWith("--"))
                    keys << k.right(k.size() - 2);
            }
        } else {
            if (line.isEmpty()) {
                if (!keys.isEmpty()) {
                    // Write entry
                    stream.writeStartElement(Constants::DOCUMENTATION_XMLENTRY);
                    stream.writeStartElement(Constants::DOCUMENTATION_XMLKEYS);
                    for (const QString &key : keys)
                        stream.writeTextElement(Constants::DOCUMENTATION_XMLKEY, key);
                    stream.writeEndElement();
                    const QString text = "<p><span class=\"option\">"
                            + keys.filter(QRegExp("^\\-")).join(", ") + "</span></p><p>"
                            + (docu.join(' ').toHtmlEscaped()) + "</p>";
                    stream.writeTextElement(Constants::DOCUMENTATION_XMLDOC, text);
                    stream.writeEndElement();
                    contextWritten = true;
                }
                keys.clear();
                docu.clear();
            } else if (!keys.isEmpty()) {
                docu << line;
            }
        }
    }

    stream.writeEndElement();
    stream.writeEndDocument();

    // An empty file causes error messages and a contextless file preventing this function to run
    // again in order to generate the documentation successfully. Thus delete the file.
    if (!contextWritten) {
        file.close();
        file.remove();
    }
}