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#include "commandlineparser.h"

#include <logging/translator.h>
#include <tools/error.h>

#include <QFileInfo>

using qbs::Internal::Tr;

static QString helpOptionShort() { return QLatin1String("-h"); }
static QString helpOptionLong() { return QLatin1String("--help"); }
static QString settingsDirOption() { return QLatin1String("--settings-dir"); }

void CommandLineParser::parse(const QStringList &commandLine)
{
    m_commandLine = commandLine;
    Q_ASSERT(!m_commandLine.isEmpty());
    m_command = QFileInfo(m_commandLine.takeFirst()).fileName();
    m_helpRequested = false;
    m_settingsDir.clear();

    if (m_commandLine.isEmpty())
        return;
    const QString &arg = m_commandLine.first();
    if (arg == helpOptionShort() || arg == helpOptionLong()) {
        m_commandLine.removeFirst();
        m_helpRequested = true;
    } else if (arg == settingsDirOption()) {
        m_commandLine.removeFirst();
        assignOptionArgument(settingsDirOption(), m_settingsDir);
    }

    if (!m_commandLine.isEmpty())
        complainAboutExtraArguments();
}

void CommandLineParser::throwError(const QString &message)
{
    qbs::ErrorInfo error(Tr::tr("Syntax error: %1").arg(message));
    error.append(usageString());
    throw error;
}

QString CommandLineParser::usageString() const
{
    QString s = Tr::tr("This tool displays qbs settings in a GUI.\n"
                       "If you have more than a few settings, this might be preferable to "
                       "plain \"qbs config\", as it presents a hierarchical view.\n");
    s += Tr::tr("Usage:\n");
    s += Tr::tr("    %1 [%2 <settings directory>] [%3|%4]\n")
            .arg(m_command, settingsDirOption(), helpOptionShort(), helpOptionLong());
    return s;
}

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

void CommandLineParser::complainAboutExtraArguments()
{
    throwError(Tr::tr("Extraneous command-line arguments '%1'.")
               .arg(m_commandLine.join(QLatin1Char(' '))));
}
