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#include "commandlineparser.h"

#include <QFileInfo>

static QString profileOption() { return "--profile"; }
static QString startCommitOption() { return "--start-commit"; }

CommandLineParser::CommandLineParser()
{
}

void CommandLineParser::parse(const QStringList &commandLine)
{
    m_profile.clear();
    m_startCommit.clear();
    m_commandLine = commandLine;
    Q_ASSERT(!m_commandLine.isEmpty());
    m_command = m_commandLine.takeFirst();
    while (!m_commandLine.isEmpty()) {
        const QString arg = m_commandLine.takeFirst();
        if (arg == profileOption())
            assignOptionArgument(arg, m_profile);
        else if (arg == startCommitOption())
            assignOptionArgument(arg, m_startCommit);
        else
            throw ParseException(QString::fromLocal8Bit("Unknown parameter '%1'").arg(arg));
    }
    if (m_profile.isEmpty())
        throw ParseException("No profile given.");
    if (m_startCommit.isEmpty())
        throw ParseException("No start commit given.");
}

QString CommandLineParser::usageString() const
{
    return QString::fromLocal8Bit("%1 %2 <profile> %3 <start commit>")
            .arg(QFileInfo(m_command).fileName(), profileOption(), startCommitOption());
}

void CommandLineParser::assignOptionArgument(const QString &option, QString &argument)
{
    if (m_commandLine.isEmpty())
        throw ParseException(QString::fromLocal8Bit("Option '%1' needs an argument.").arg(option));
    argument = m_commandLine.takeFirst();
    if (argument.isEmpty()) {
        throw ParseException(QString::fromLocal8Bit("Argument for option '%1' must not be empty.")
                             .arg(option));
    }
}
