fileprinter.cpp

/***************************************************************************
 *   Copyright (C) 2007,2010 by John Layt <john@layt.net>                  *
 *                                                                         *
 *   FilePrinterPreview based on KPrintPreview (originally LGPL)           *
 *   Copyright (c) 2007 Alex Merry <huntedhacker@tiscali.co.uk>            *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#include "fileprinter.h"

#include <QFile>
#include <QFileInfo>
#include <QLabel>
#include <QPrintEngine>
#include <QShowEvent>
#include <QSize>
#include <QStringList>
#include <QTcpSocket>

#include <KProcess>
#include <KShell>
#include <QDebug>
#include <QStandardPaths>

#include "debug_p.h"

using namespace Okular;

int FilePrinter::printFile(QPrinter &printer,
                           const QString file, // NOLINT(performance-unnecessary-value-param) clazy:exclude=function-args-by-ref TODO when BIC changes are allowed
                           QPrinter::Orientation documentOrientation,
                           FileDeletePolicy fileDeletePolicy,
                           PageSelectPolicy pageSelectPolicy,
                           const QString &pageRange)
{
    return printFile(printer, file, documentOrientation, fileDeletePolicy, pageSelectPolicy, pageRange, ScaleMode::FitToPrintArea);
}

int FilePrinter::printFile(QPrinter &printer,
                           const QString file, // NOLINT(performance-unnecessary-value-param) clazy:exclude=function-args-by-ref TODO when BIC changes are allowed
                           QPrinter::Orientation documentOrientation,
                           FileDeletePolicy fileDeletePolicy,
                           PageSelectPolicy pageSelectPolicy,
                           const QString &pageRange,
                           ScaleMode scaleMode)
{
    FilePrinter fp;
    return fp.doPrintFiles(printer, QStringList(file), fileDeletePolicy, pageSelectPolicy, pageRange, documentOrientation, scaleMode);
}

int FilePrinter::doPrintFiles(QPrinter &printer,
                              const QStringList fileList, // NOLINT(performance-unnecessary-value-param) clazy:exclude=function-args-by-ref TODO when BIC changes are allowed
                              FileDeletePolicy fileDeletePolicy,
                              PageSelectPolicy pageSelectPolicy,
                              const QString &pageRange,
                              QPrinter::Orientation documentOrientation)
{
    return doPrintFiles(printer, fileList, fileDeletePolicy, pageSelectPolicy, pageRange, documentOrientation, ScaleMode::FitToPrintArea);
}

int FilePrinter::doPrintFiles(QPrinter &printer, QStringList fileList, FileDeletePolicy fileDeletePolicy, PageSelectPolicy pageSelectPolicy, const QString &pageRange, QPrinter::Orientation documentOrientation, ScaleMode scaleMode)
{
    if (fileList.size() < 1) {
        return -8;
    }

    for (QStringList::ConstIterator it = fileList.constBegin(); it != fileList.constEnd(); ++it) {
        if (!QFile::exists(*it)) {
            return -7;
        }
    }

    if (printer.printerState() == QPrinter::Aborted || printer.printerState() == QPrinter::Error) {
        return -6;
    }

    QString exe;
    QStringList argList;
    int ret;

    // Print to File if a filename set, assumes there must be only 1 file
    if (!printer.outputFileName().isEmpty()) {
        if (QFile::exists(printer.outputFileName())) {
            QFile::remove(printer.outputFileName());
        }

        QFileInfo inputFileInfo = QFileInfo(fileList[0]);
        QFileInfo outputFileInfo = QFileInfo(printer.outputFileName());

        bool doDeleteFile = (fileDeletePolicy == FilePrinter::SystemDeletesFiles);
        if (inputFileInfo.suffix() == outputFileInfo.suffix()) {
            if (doDeleteFile) {
                bool res = QFile::rename(fileList[0], printer.outputFileName());
                if (res) {
                    doDeleteFile = false;
                    ret = 0;
                } else {
                    ret = -5;
                }
            } else {
                bool res = QFile::copy(fileList[0], printer.outputFileName());
                if (res) {
                    ret = 0;
                } else {
                    ret = -5;
                }
            }
        } else if (inputFileInfo.suffix() == QLatin1String("ps") && printer.outputFormat() == QPrinter::PdfFormat && ps2pdfAvailable()) {
            exe = QStringLiteral("ps2pdf");
            argList << fileList[0] << printer.outputFileName();
            qCDebug(OkularCoreDebug) << "Executing" << exe << "with arguments" << argList;
            ret = KProcess::execute(exe, argList);
        } else if (inputFileInfo.suffix() == QLatin1String("pdf") && printer.outputFormat() == QPrinter::NativeFormat && pdf2psAvailable()) {
            exe = QStringLiteral("pdf2ps");
            argList << fileList[0] << printer.outputFileName();
            qCDebug(OkularCoreDebug) << "Executing" << exe << "with arguments" << argList;
            ret = KProcess::execute(exe, argList);
        } else {
            ret = -5;
        }

        if (doDeleteFile) {
            QFile::remove(fileList[0]);
        }

    } else { // Print to a printer via lpr command

        // Decide what executable to use to print with, need the CUPS version of lpr if available
        // Some distros name the CUPS version of lpr as lpr-cups or lpr.cups so try those first
        // before default to lpr, or failing that to lp

        if (!QStandardPaths::findExecutable(QStringLiteral("lpr-cups")).isEmpty()) {
            exe = QStringLiteral("lpr-cups");
        } else if (!QStandardPaths::findExecutable(QStringLiteral("lpr.cups")).isEmpty()) {
            exe = QStringLiteral("lpr.cups");
        } else if (!QStandardPaths::findExecutable(QStringLiteral("lpr")).isEmpty()) {
            exe = QStringLiteral("lpr");
        } else if (!QStandardPaths::findExecutable(QStringLiteral("lp")).isEmpty()) {
            exe = QStringLiteral("lp");
        } else {
            return -9;
        }

        bool useCupsOptions = cupsAvailable();
        argList = printArguments(printer, fileDeletePolicy, pageSelectPolicy, useCupsOptions, pageRange, exe, documentOrientation, scaleMode) << fileList;
        qCDebug(OkularCoreDebug) << "Executing" << exe << "with arguments" << argList;

        ret = KProcess::execute(exe, argList);
    }

    return ret;
}

QList<int> FilePrinter::pageList(QPrinter &printer, int lastPage, const QList<int> &selectedPageList)
{
    return pageList(printer, lastPage, 0, selectedPageList);
}

QList<int> FilePrinter::pageList(QPrinter &printer, int lastPage, int currentPage, const QList<int> &selectedPageList)
{
    if (printer.printRange() == QPrinter::Selection) {
        return selectedPageList;
    }

    int startPage, endPage;
    QList<int> list;

    if (printer.printRange() == QPrinter::PageRange) {
        startPage = printer.fromPage();
        endPage = printer.toPage();
    } else if (printer.printRange() == QPrinter::CurrentPage) {
        startPage = currentPage;
        endPage = currentPage;
    } else { // AllPages
        startPage = 1;
        endPage = lastPage;
    }

    for (int i = startPage; i <= endPage; i++) {
        list << i;
    }

    return list;
}

QString FilePrinter::pageRange(QPrinter &printer, int lastPage, const QList<int> &selectedPageList)
{
    if (printer.printRange() == QPrinter::Selection) {
        return pageListToPageRange(selectedPageList);
    }

    if (printer.printRange() == QPrinter::PageRange) {
        return QStringLiteral("%1-%2").arg(printer.fromPage()).arg(printer.toPage());
    }

    return QStringLiteral("1-%2").arg(lastPage);
}

QString FilePrinter::pageListToPageRange(const QList<int> &pageList)
{
    QString pageRange;
    int count = pageList.count();
    int i = 0;
    int seqStart = i;
    int seqEnd;

    while (i != count) {
        if (i + 1 == count || pageList[i] + 1 != pageList[i + 1]) {
            seqEnd = i;

            if (!pageRange.isEmpty()) {
                pageRange.append(QLatin1Char(','));
            }

            if (seqStart == seqEnd) {
                pageRange.append(pageList[i]);
            } else {
                pageRange.append(QStringLiteral("%1-%2").arg(seqStart).arg(seqEnd));
            }

            seqStart = i + 1;
        }

        i++;
    }

    return pageRange;
}

bool FilePrinter::ps2pdfAvailable()
{
    return (!QStandardPaths::findExecutable(QStringLiteral("ps2pdf")).isEmpty());
}

bool FilePrinter::pdf2psAvailable()
{
    return (!QStandardPaths::findExecutable(QStringLiteral("pdf2ps")).isEmpty());
}

bool FilePrinter::cupsAvailable()
{
#if defined(Q_OS_UNIX) && !defined(Q_OS_OSX)
    // Ideally we would have access to the private Qt method
    // QCUPSSupport::cupsAvailable() to do this as it is very complex routine.
    // However, if CUPS is available then QPrinter::numCopies() will always return 1
    // whereas if CUPS is not available it will return the real number of copies.
    // This behaviour is guaranteed never to change, so we can use it as a reliable substitute.
    QPrinter testPrinter;
    testPrinter.setNumCopies(2);
    return (testPrinter.numCopies() == 1);
#else
    return false;
#endif
}

bool FilePrinter::detectCupsService()
{
    QTcpSocket qsock;
    qsock.connectToHost(QStringLiteral("localhost"), 631);
    bool rtn = qsock.waitForConnected() && qsock.isValid();
    qsock.abort();
    return rtn;
}

bool FilePrinter::detectCupsConfig()
{
    if (QFile::exists(QStringLiteral("/etc/cups/cupsd.conf")))
        return true;
    if (QFile::exists(QStringLiteral("/usr/etc/cups/cupsd.conf")))
        return true;
    if (QFile::exists(QStringLiteral("/usr/local/etc/cups/cupsd.conf")))
        return true;
    if (QFile::exists(QStringLiteral("/opt/etc/cups/cupsd.conf")))
        return true;
    if (QFile::exists(QStringLiteral("/opt/local/etc/cups/cupsd.conf")))
        return true;
    return false;
}

QSize FilePrinter::psPaperSize(QPrinter &printer)
{
    QSize size = printer.pageLayout().pageSize().sizePoints();

    if (printer.pageSize() == QPrinter::Custom) {
        return QSize((int)printer.widthMM() * (25.4 / 72), (int)printer.heightMM() * (25.4 / 72));
    }

    if (printer.orientation() == QPrinter::Landscape) {
        size.transpose();
    }

    return size;
}

Generator::PrintError FilePrinter::printError(int c)
{
    Generator::PrintError pe;
    if (c >= 0) {
        pe = Generator::NoPrintError;
    } else {
        switch (c) {
        case -1:
            pe = Generator::PrintingProcessCrashPrintError;
            break;
        case -2:
            pe = Generator::PrintingProcessStartPrintError;
            break;
        case -5:
            pe = Generator::PrintToFilePrintError;
            break;
        case -6:
            pe = Generator::InvalidPrinterStatePrintError;
            break;
        case -7:
            pe = Generator::UnableToFindFilePrintError;
            break;
        case -8:
            pe = Generator::NoFileToPrintError;
            break;
        case -9:
            pe = Generator::NoBinaryToPrintError;
            break;
        default:
            pe = Generator::UnknownPrintError;
        }
    }
    return pe;
}

QStringList
FilePrinter::printArguments(QPrinter &printer, FileDeletePolicy fileDeletePolicy, PageSelectPolicy pageSelectPolicy, bool useCupsOptions, const QString &pageRange, const QString &version, QPrinter::Orientation documentOrientation)
{
    return printArguments(printer, fileDeletePolicy, pageSelectPolicy, useCupsOptions, pageRange, version, documentOrientation, ScaleMode::FitToPrintArea);
}

QStringList FilePrinter::printArguments(QPrinter &printer,
                                        FileDeletePolicy fileDeletePolicy,
                                        PageSelectPolicy pageSelectPolicy,
                                        bool useCupsOptions,
                                        const QString &pageRange,
                                        const QString &version,
                                        QPrinter::Orientation documentOrientation,
                                        ScaleMode scaleMode)
{
    QStringList argList;

    if (!destination(printer, version).isEmpty()) {
        argList << destination(printer, version);
    }

    if (!copies(printer, version).isEmpty()) {
        argList << copies(printer, version);
    }

    if (!jobname(printer, version).isEmpty()) {
        argList << jobname(printer, version);
    }

    if (!pages(printer, pageSelectPolicy, pageRange, useCupsOptions, version).isEmpty()) {
        argList << pages(printer, pageSelectPolicy, pageRange, useCupsOptions, version);
    }

    if (useCupsOptions && !cupsOptions(printer, documentOrientation, scaleMode).isEmpty()) {
        argList << cupsOptions(printer, documentOrientation, scaleMode);
    }

    if (!deleteFile(printer, fileDeletePolicy, version).isEmpty()) {
        argList << deleteFile(printer, fileDeletePolicy, version);
    }

    if (version == QLatin1String("lp")) {
        argList << QStringLiteral("--");
    }

    return argList;
}

QStringList FilePrinter::destination(QPrinter &printer, const QString &version)
{
    if (version == QLatin1String("lp")) {
        return QStringList(QStringLiteral("-d")) << printer.printerName();
    }

    if (version.startsWith(QLatin1String("lpr"))) {
        return QStringList(QStringLiteral("-P")) << printer.printerName();
    }

    return QStringList();
}

QStringList FilePrinter::copies(QPrinter &printer, const QString &version)
{
    int cp = printer.actualNumCopies();

    if (version == QLatin1String("lp")) {
        return QStringList(QStringLiteral("-n")) << QStringLiteral("%1").arg(cp);
    }

    if (version.startsWith(QLatin1String("lpr"))) {
        return QStringList() << QStringLiteral("-#%1").arg(cp);
    }

    return QStringList();
}

QStringList FilePrinter::jobname(QPrinter &printer, const QString &version)
{
    if (!printer.docName().isEmpty()) {
        if (version == QLatin1String("lp")) {
            return QStringList(QStringLiteral("-t")) << printer.docName();
        }

        if (version.startsWith(QLatin1String("lpr"))) {
            const QString shortenedDocName = QString::fromUtf8(printer.docName().toUtf8().left(255));
            return QStringList(QStringLiteral("-J")) << shortenedDocName;
        }
    }

    return QStringList();
}

QStringList FilePrinter::deleteFile(QPrinter &, FileDeletePolicy fileDeletePolicy, const QString &version)
{
    if (fileDeletePolicy == FilePrinter::SystemDeletesFiles && version.startsWith(QLatin1String("lpr"))) {
        return QStringList(QStringLiteral("-r"));
    }

    return QStringList();
}

QStringList FilePrinter::pages(QPrinter &printer, PageSelectPolicy pageSelectPolicy, const QString &pageRange, bool useCupsOptions, const QString &version)
{
    if (pageSelectPolicy == FilePrinter::SystemSelectsPages) {
        if (printer.printRange() == QPrinter::Selection && !pageRange.isEmpty()) {
            if (version == QLatin1String("lp")) {
                return QStringList(QStringLiteral("-P")) << pageRange;
            }

            if (version.startsWith(QLatin1String("lpr")) && useCupsOptions) {
                return QStringList(QStringLiteral("-o")) << QStringLiteral("page-ranges=%1").arg(pageRange);
            }
        }

        if (printer.printRange() == QPrinter::PageRange) {
            if (version == QLatin1String("lp")) {
                return QStringList(QStringLiteral("-P")) << QStringLiteral("%1-%2").arg(printer.fromPage()).arg(printer.toPage());
            }

            if (version.startsWith(QLatin1String("lpr")) && useCupsOptions) {
                return QStringList(QStringLiteral("-o")) << QStringLiteral("page-ranges=%1-%2").arg(printer.fromPage()).arg(printer.toPage());
            }
        }
    }

    return QStringList(); // AllPages
}

QStringList FilePrinter::cupsOptions(QPrinter &printer, QPrinter::Orientation documentOrientation)
{
    return cupsOptions(printer, documentOrientation, ScaleMode::FitToPrintArea);
}

QStringList FilePrinter::cupsOptions(QPrinter &printer, QPrinter::Orientation documentOrientation, ScaleMode scaleMode)
{
    QStringList optionList;

    if (!optionMedia(printer).isEmpty()) {
        optionList << optionMedia(printer);
    }

    if (!optionOrientation(printer, documentOrientation).isEmpty()) {
        optionList << optionOrientation(printer, documentOrientation);
    }

    if (!optionDoubleSidedPrinting(printer).isEmpty()) {
        optionList << optionDoubleSidedPrinting(printer);
    }

    if (!optionPageOrder(printer).isEmpty()) {
        optionList << optionPageOrder(printer);
    }

    if (!optionCollateCopies(printer).isEmpty()) {
        optionList << optionCollateCopies(printer);
    }

    if (!optionPageMargins(printer, scaleMode).isEmpty()) {
        optionList << optionPageMargins(printer, scaleMode);
    }

    optionList << optionCupsProperties(printer);

    return optionList;
}

QStringList FilePrinter::optionMedia(QPrinter &printer)
{
    if (!mediaPageSize(printer).isEmpty() && !mediaPaperSource(printer).isEmpty()) {
        return QStringList(QStringLiteral("-o")) << QStringLiteral("media=%1,%2").arg(mediaPageSize(printer), mediaPaperSource(printer));
    }

    if (!mediaPageSize(printer).isEmpty()) {
        return QStringList(QStringLiteral("-o")) << QStringLiteral("media=%1").arg(mediaPageSize(printer));
    }

    if (!mediaPaperSource(printer).isEmpty()) {
        return QStringList(QStringLiteral("-o")) << QStringLiteral("media=%1").arg(mediaPaperSource(printer));
    }

    return QStringList();
}

QString FilePrinter::mediaPageSize(QPrinter &printer)
{
    switch (printer.pageSize()) {
    case QPrinter::A0:
        return QStringLiteral("A0");
    case QPrinter::A1:
        return QStringLiteral("A1");
    case QPrinter::A2:
        return QStringLiteral("A2");
    case QPrinter::A3:
        return QStringLiteral("A3");
    case QPrinter::A4:
        return QStringLiteral("A4");
    case QPrinter::A5:
        return QStringLiteral("A5");
    case QPrinter::A6:
        return QStringLiteral("A6");
    case QPrinter::A7:
        return QStringLiteral("A7");
    case QPrinter::A8:
        return QStringLiteral("A8");
    case QPrinter::A9:
        return QStringLiteral("A9");
    case QPrinter::B0:
        return QStringLiteral("B0");
    case QPrinter::B1:
        return QStringLiteral("B1");
    case QPrinter::B10:
        return QStringLiteral("B10");
    case QPrinter::B2:
        return QStringLiteral("B2");
    case QPrinter::B3:
        return QStringLiteral("B3");
    case QPrinter::B4:
        return QStringLiteral("B4");
    case QPrinter::B5:
        return QStringLiteral("B5");
    case QPrinter::B6:
        return QStringLiteral("B6");
    case QPrinter::B7:
        return QStringLiteral("B7");
    case QPrinter::B8:
        return QStringLiteral("B8");
    case QPrinter::B9:
        return QStringLiteral("B9");
    case QPrinter::C5E:
        return QStringLiteral("C5"); // Correct Translation?
    case QPrinter::Comm10E:
        return QStringLiteral("Comm10"); // Correct Translation?
    case QPrinter::DLE:
        return QStringLiteral("DL"); // Correct Translation?
    case QPrinter::Executive:
        return QStringLiteral("Executive");
    case QPrinter::Folio:
        return QStringLiteral("Folio");
    case QPrinter::Ledger:
        return QStringLiteral("Ledger");
    case QPrinter::Legal:
        return QStringLiteral("Legal");
    case QPrinter::Letter:
        return QStringLiteral("Letter");
    case QPrinter::Tabloid:
        return QStringLiteral("Tabloid");
    case QPrinter::Custom:
        return QStringLiteral("Custom.%1x%2mm").arg(printer.widthMM()).arg(printer.heightMM());
    default:
        return QString();
    }
}

// What about Upper and MultiPurpose?  And others in PPD???
QString FilePrinter::mediaPaperSource(QPrinter &printer)
{
    switch (printer.paperSource()) {
    case QPrinter::Auto:
        return QString();
    case QPrinter::Cassette:
        return QStringLiteral("Cassette");
    case QPrinter::Envelope:
        return QStringLiteral("Envelope");
    case QPrinter::EnvelopeManual:
        return QStringLiteral("EnvelopeManual");
    case QPrinter::FormSource:
        return QStringLiteral("FormSource");
    case QPrinter::LargeCapacity:
        return QStringLiteral("LargeCapacity");
    case QPrinter::LargeFormat:
        return QStringLiteral("LargeFormat");
    case QPrinter::Lower:
        return QStringLiteral("Lower");
    case QPrinter::MaxPageSource:
        return QStringLiteral("MaxPageSource");
    case QPrinter::Middle:
        return QStringLiteral("Middle");
    case QPrinter::Manual:
        return QStringLiteral("Manual");
    case QPrinter::OnlyOne:
        return QStringLiteral("OnlyOne");
    case QPrinter::Tractor:
        return QStringLiteral("Tractor");
    case QPrinter::SmallFormat:
        return QStringLiteral("SmallFormat");
    default:
        return QString();
    }
}

QStringList FilePrinter::optionOrientation(QPrinter &printer, QPrinter::Orientation documentOrientation)
{
    // portrait and landscape options rotate the document according to the document orientation
    // If we want to print a landscape document as one would expect it, we have to pass the
    // portrait option so that the document is not rotated additionally
    if (printer.orientation() == documentOrientation) {
        // the user wants the document printed as is
        return QStringList(QStringLiteral("-o")) << QStringLiteral("portrait");
    } else {
        // the user expects the document being rotated by 90 degrees
        return QStringList(QStringLiteral("-o")) << QStringLiteral("landscape");
    }
}

QStringList FilePrinter::optionDoubleSidedPrinting(QPrinter &printer)
{
    switch (printer.duplex()) {
    case QPrinter::DuplexNone:
        return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=one-sided");
    case QPrinter::DuplexAuto:
        if (printer.orientation() == QPrinter::Landscape) {
            return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-short-edge");
        } else {
            return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-long-edge");
        }
    case QPrinter::DuplexLongSide:
        return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-long-edge");
    case QPrinter::DuplexShortSide:
        return QStringList(QStringLiteral("-o")) << QStringLiteral("sides=two-sided-short-edge");
    default:
        return QStringList(); // Use printer default
    }
}

QStringList FilePrinter::optionPageOrder(QPrinter &printer)
{
    if (printer.pageOrder() == QPrinter::LastPageFirst) {
        return QStringList(QStringLiteral("-o")) << QStringLiteral("outputorder=reverse");
    }
    return QStringList(QStringLiteral("-o")) << QStringLiteral("outputorder=normal");
}

QStringList FilePrinter::optionCollateCopies(QPrinter &printer)
{
    if (printer.collateCopies()) {
        return QStringList(QStringLiteral("-o")) << QStringLiteral("Collate=True");
    }
    return QStringList(QStringLiteral("-o")) << QStringLiteral("Collate=False");
}

QStringList FilePrinter::optionPageMargins(QPrinter &printer)
{
    return optionPageMargins(printer, ScaleMode::FitToPrintArea);
}

QStringList FilePrinter::optionPageMargins(QPrinter &printer, ScaleMode scaleMode)
{
    if (printer.printEngine()->property(QPrintEngine::PPK_PageMargins).isNull()) {
        return QStringList();
    } else {
        qreal l(0), t(0), r(0), b(0);
        if (!printer.fullPage()) {
            printer.getPageMargins(&l, &t, &r, &b, QPrinter::Point);
        }
        QStringList marginOptions;
        marginOptions << (QStringLiteral("-o")) << QStringLiteral("page-left=%1").arg(l) << QStringLiteral("-o") << QStringLiteral("page-top=%1").arg(t) << QStringLiteral("-o") << QStringLiteral("page-right=%1").arg(r)
                      << QStringLiteral("-o") << QStringLiteral("page-bottom=%1").arg(b);
        if (scaleMode == ScaleMode::FitToPrintArea) {
            marginOptions << QStringLiteral("-o") << QStringLiteral("fit-to-page");
        }

        return marginOptions;
    }
}

QStringList FilePrinter::optionCupsProperties(QPrinter &printer)
{
    QStringList dialogOptions = printer.printEngine()->property(QPrintEngine::PrintEnginePropertyKey(0xfe00)).toStringList();
    QStringList cupsOptions;

    for (int i = 0; i < dialogOptions.count(); i = i + 2) {
        if (dialogOptions[i + 1].isEmpty()) {
            cupsOptions << QStringLiteral("-o") << dialogOptions[i];
        } else {
            cupsOptions << QStringLiteral("-o") << dialogOptions[i] + QLatin1Char('=') + dialogOptions[i + 1];
        }
    }

    return cupsOptions;
}

/* kate: replace-tabs on; indent-width 4; */