kxmlcommand.cpp

/*
 *  This file is part of the KDE libraries
 *  Copyright (c) 2001 Michael Goffioul <tdeprint@swing.be>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/
 
#include "kxmlcommand.h"
#include "driver.h"
#include "kmfactory.h"
#include "tdeprintcheck.h"
#include "driverview.h"
 
#include <tqfile.h>
#include <tqregexp.h>
#include <tqdir.h>
#include <tqinputdialog.h>
#include <tqmap.h>
#include <tqvaluelist.h>
#include <tdestandarddirs.h>
#include <tdelocale.h>
#include <ksimpleconfig.h>
#include <kdialogbase.h>
#include <kdebug.h>
#include <tdeprocess.h>
#include <klibloader.h>
#include <tdemessagebox.h>
 
static void setOptionText(DrBase *opt, const TQString& s)
{
    if (s.isEmpty())
        opt->set("text", opt->name());
    else
        opt->set("text", i18n(s.utf8()));
}
 
class KXmlCommand::KXmlCommandPrivate
{
public:
    TQString    m_name;
    TQString    m_command;
    DrMain  *m_driver;
    struct
    {
        TQString    m_format[2];    // 0 -> file, 1 -> pipe
    }   m_io[2];                // 0 -> input, 1 -> output
    TQString    m_description;
    TQString    m_outputMime;
    TQStringList    m_inputMime;
    TQStringList    m_requirements;
    bool    m_loaded[2];    // 0 -> Desktop, 1 -> XML
    TQString m_comment;
};
 
KXmlCommand::KXmlCommand(const TQString& xmlId)
: TQObject(KXmlCommandManager::self(), "XmlCommand")
{
    init();
    d->m_name = xmlId;
}
 
KXmlCommand::~KXmlCommand()
{
    //kdDebug(500) << "deleting driver" << endl;
    delete d->m_driver;
    //kdDebug(500) << "deleting private data" << endl;
    delete d;
    //kdDebug(500) << "finished" << endl;
}
 
void KXmlCommand::init()
{
    d = new KXmlCommandPrivate;
    d->m_driver = 0;
    d->m_loaded[0] = d->m_loaded[1] = false;
}
 
TQString KXmlCommand::name() const
{ return d->m_name; }
 
void KXmlCommand::setName(const TQString& s)
{ d->m_name = s; }
 
TQString KXmlCommand::command()
{
    check(true);
    return d->m_command;
}
 
void KXmlCommand::setCommand(const TQString& s)
{
    d->m_command = s;
}
 
DrMain* KXmlCommand::driver()
{
    check(true);
    return d->m_driver;
}
 
DrMain* KXmlCommand::takeDriver()
{
    check(true);
    DrMain  *dr = d->m_driver;
    d->m_driver = 0;
    d->m_loaded[1] = false;
    return dr;
}
 
void KXmlCommand::setDriver(DrMain *driver)
{
    delete d->m_driver;
    d->m_driver = driver;
}
 
TQString KXmlCommand::io(bool io_input, bool io_pipe)
{
    check(true);
    return d->m_io[(io_input?0:1)].m_format[(io_pipe?1:0)];
}
 
void KXmlCommand::setIo(const TQString& s, bool io_input, bool io_pipe)
{
    d->m_io[(io_input?0:1)].m_format[(io_pipe?1:0)] = s;
}
 
TQString KXmlCommand::description()
{
    check();
    return d->m_description;
}
 
void KXmlCommand::setDescription(const TQString& s)
{
    d->m_description = s;
}
 
TQString KXmlCommand::mimeType()
{
    check();
    return d->m_outputMime;
}
 
void KXmlCommand::setMimeType(const TQString& s)
{
    d->m_outputMime = s;
}
 
bool KXmlCommand::acceptMimeType(const TQString& s)
{
    check();
    return (d->m_inputMime.find(s) != d->m_inputMime.end());
}
 
TQStringList KXmlCommand::inputMimeTypes()
{
    check();
    return d->m_inputMime;
}
 
void KXmlCommand::setInputMimeTypes(const TQStringList& l)
{
    d->m_inputMime = l;
}
 
TQStringList KXmlCommand::requirements()
{
    check();
    return d->m_requirements;
}
 
void KXmlCommand::setRequirements(const TQStringList& l)
{
    d->m_requirements = l;
}
 
TQString KXmlCommand::comment()
{
    check();
    return d->m_comment;
}
 
void KXmlCommand::setComment( const TQString& s )
{
    d->m_comment = s;
}
 
bool KXmlCommand::isValid()
{
    return (!locate("data", "tdeprint/filters/"+name()+".desktop").isEmpty());
}
 
void KXmlCommand::check(bool use_xml)
{
    if (!d->m_loaded[0])
    {
        loadDesktop();
        d->m_loaded[0] = true;
    }
    if (use_xml && !d->m_loaded[1])
    {
        loadXml();
        d->m_loaded[1] = true;
    }
}
 
void KXmlCommand::loadDesktop()
{
    KSimpleConfig   conf(locate("data", "tdeprint/filters/"+name()+".desktop"));
    conf.setGroup("TDE Print Filter Entry");
    d->m_description = conf.readEntry("Comment");
    d->m_outputMime = conf.readEntry("MimeTypeOut");
    d->m_inputMime = conf.readListEntry("MimeTypeIn");
    d->m_requirements = conf.readListEntry("Require");
    d->m_comment = conf.readEntry( "Description" );
}
 
void KXmlCommand::saveDesktop()
{
    KSimpleConfig   conf(locateLocal("data", "tdeprint/filters/"+name()+".desktop"));
    conf.setGroup("TDE Print Filter Entry");
    conf.writeEntry("Comment", d->m_description);
    conf.writeEntry("MimeTypeIn", d->m_inputMime);
    conf.writeEntry("MimeTypeOut", d->m_outputMime);
    conf.writeEntry("Require", d->m_requirements);
    conf.writeEntry( "Description", d->m_comment );
}
 
void KXmlCommand::loadXml()
{
    TQFile  f(locate("data", "tdeprint/filters/"+name()+".xml"));
    TQDomDocument   doc;
    if (f.open(IO_ReadOnly) && doc.setContent(&f) && doc.documentElement().tagName() == "kprintfilter")
    {
        TQDomElement    e, docElem = doc.documentElement();
        d->m_name = docElem.attribute("name");
 
        // command
        e = docElem.namedItem("filtercommand").toElement();
        if (!e.isNull())
            d->m_command = e.attribute("data");
 
        // arguments
        e = docElem.namedItem("filterargs").toElement();
        if (!e.isNull())
        {
            d->m_driver = new DrMain;
            d->m_driver->setName(d->m_name);
            parseGroup(e, d->m_driver);
            setOptionText(d->m_driver, d->m_description);
        }
 
        // input/output
        e = docElem.namedItem("filterinput").toElement();
        if (!e.isNull())
            parseIO(e, 0);
        e = docElem.namedItem("filteroutput").toElement();
        if (!e.isNull())
            parseIO(e, 1);
    }
}
 
void KXmlCommand::parseIO(const TQDomElement& e, int n)
{
    TQDomElement    elem = e.firstChild().toElement();
    while (!elem.isNull())
    {
        if (elem.tagName() == "filterarg")
        {
            int format = (elem.attribute("name") == "file" ? 0 : 1);
            d->m_io[n].m_format[format] = elem.attribute("format");
        }
        elem = elem.nextSibling().toElement();
    }
}
 
DrGroup* KXmlCommand::parseGroup(const TQDomElement& e, DrGroup *grp)
{
    if (!grp)
        grp = new DrGroup;
    grp->setName(e.attribute("name"));
    setOptionText(grp, e.attribute("description"));
 
    TQDomElement    elem = e.firstChild().toElement();
    while (!elem.isNull())
    {
        if (elem.tagName() == "filterarg")
        {
            DrBase  *opt = parseArgument(elem);
            if (opt)
                grp->addOption(opt);
        }
        else if (elem.tagName() == "filtergroup")
        {
            DrGroup *group = parseGroup(elem, 0);
            if (group)
                grp->addGroup(group);
        }
        elem = elem.nextSibling().toElement();
    }
 
    return grp;
}
 
DrBase* KXmlCommand::parseArgument(const TQDomElement& e)
{
    DrBase  *opt(0);
    TQString    type = e.attribute("type");
 
    if (type == "int" || type == "float")
    {
        if (type == "int")
            opt = new DrIntegerOption;
        else
            opt = new DrFloatOption;
        opt->set("minval", e.attribute("min"));
        opt->set("maxval", e.attribute("max"));
    }
    else if (type == "string")
        opt = new DrStringOption;
    else if (type == "list" || type == "bool")
    {
        if (type == "list")
            opt = new DrListOption;
        else
            opt = new DrBooleanOption;
        DrListOption    *lopt = static_cast<DrListOption*>(opt);
        TQDomElement    elem = e.firstChild().toElement();
        while (!elem.isNull())
        {
            if (elem.tagName() == "value")
            {
                DrBase  *choice = new DrBase;
                choice->setName(elem.attribute("name"));
                setOptionText(choice, elem.attribute("description"));
                lopt->addChoice(choice);
            }
            elem = elem.nextSibling().toElement();
        }
    }
    else
        return 0;
 
    opt->setName("_kde-" + d->m_name + "-" + e.attribute("name"));
    setOptionText(opt, e.attribute("description"));
    opt->set("format", e.attribute("format"));
    opt->set("default", e.attribute("default"));
    opt->set( "persistent", e.attribute( "persistent" ) );
    opt->setValueText(opt->get("default"));
 
    return opt;
}
 
TQString KXmlCommand::buildCommand(const TQMap<TQString,TQString>& opts, bool pipein, bool pipeout)
{
    check(true);
 
    TQString        str, cmd = d->m_command;
    TQString re( "%value" ), quotedRe( "'%value'" );
 
    if (d->m_driver)
    {
        TQMap<TQString,TQString>    fopts;
 
        d->m_driver->setOptions(opts);
        d->m_driver->getOptions(fopts, false);
        for (TQMap<TQString,TQString>::ConstIterator it=fopts.begin(); it!=fopts.end(); ++it)
        {
            DrBase  *dopt = d->m_driver->findOption(it.key());
            if (dopt)
            {
                TQString    format = dopt->get("format");
                TQString value = dopt->valueText();
                if ( format.find( quotedRe ) != -1 )
                {
                    if ( ( value.right( 1 ) == "'" && value.left( 1 ) == "'" )  ||
                         ( value.right( 1 ) == "\"" && value.left( 1 ) == "\"" ) )
                        format.replace( quotedRe, value );
                    else
                        format.replace( re, value );
                }
                else
                {
                    format.replace( re, TDEProcess::quote( dopt->valueText() ) );
                }
                str.append(format).append(" ");
            }
        }
        cmd.replace("%filterargs", str);
    }
 
    cmd.replace("%filterinput", d->m_io[0].m_format[(pipein?1:0)]);
    cmd.replace("%filteroutput", d->m_io[1].m_format[(pipeout?1:0)]);
 
    return cmd;
}
 
void KXmlCommand::setOptions(const TQMap<TQString,TQString>& opts)
{
    if (opts.count() == 0)
        return;
    // force loading the driver if needed
    if (driver())
        d->m_driver->setOptions(opts);
}
 
void KXmlCommand::getOptions(TQMap<TQString,TQString>& opts, bool incldef)
{
    // force loading the driver
    if (driver())
        d->m_driver->getOptions(opts, incldef);
}
 
void KXmlCommand::saveXml()
{
    TQFile  f(locateLocal("data", "tdeprint/filters/"+name()+".xml"));
    if (!f.open(IO_WriteOnly))
        return;
 
    TQDomDocument   doc("kprintfilter");
    TQDomElement    root = doc.createElement("kprintfilter"), elem;
 
    root.setAttribute("name", d->m_name);
    doc.appendChild(root);
 
    // command
    elem = doc.createElement("filtercommand");
    elem.setAttribute("data", d->m_command);
    root.appendChild(elem);
 
    // options
    if (d->m_driver)
    {
        elem = createGroup(doc, d->m_driver);
        elem.setTagName("filterargs");
        root.appendChild(elem);
    }
 
    // IO
    if (!(elem=createIO(doc, 0, "filterinput")).isNull())
        root.appendChild(elem);
    if (!(elem=createIO(doc, 1, "filteroutput")).isNull())
        root.appendChild(elem);
 
    // save to file (and close it)
    TQTextStream    t(&f);
    t << doc.toString();
    f.close();
}
 
TQDomElement KXmlCommand::createIO(TQDomDocument& doc, int n, const TQString& tag)
{
    TQDomElement    elem = doc.createElement(tag);
    if (d->m_command.find("%"+tag) != -1)
    {
        for (int i=0; i<2; i++)
        {
            TQDomElement    io = doc.createElement("filterarg");
            io.setAttribute("name", (i ? "pipe" : "file"));
            io.setAttribute("format", d->m_io[n].m_format[i]);
            elem.appendChild(io);
        }
    }
 
    return elem;
}
 
TQDomElement KXmlCommand::createGroup(TQDomDocument& doc, DrGroup *group)
{
    TQDomElement    elem = doc.createElement("filtergroup");
    elem.setAttribute("name", group->name());
    elem.setAttribute("description", group->get("text"));
 
    TQPtrListIterator<DrGroup>  git(group->groups());
    for (; git.current(); ++git)
        elem.appendChild(createGroup(doc, git.current()));
 
    TQPtrListIterator<DrBase>   oit(group->options());
    for (; oit.current(); ++oit)
        elem.appendChild(createElement(doc, oit.current()));
 
    return elem;
}
 
TQDomElement KXmlCommand::createElement(TQDomDocument& doc, DrBase *opt)
{
    TQDomElement    elem = doc.createElement("filterarg");
    TQString    elemName = opt->name();
    if (elemName.startsWith("_kde-"))
        elemName.replace(0, name().length()+6, "");
    elem.setAttribute("name", elemName);
    elem.setAttribute("format", opt->get("format"));
    elem.setAttribute("description", opt->get("text"));
    elem.setAttribute("default", opt->get("default"));
    elem.setAttribute( "persistent", opt->get( "persistent" ) == "1" ? "1" : "0");
 
    switch (opt->type())
    {
        case DrBase::String:
            elem.setAttribute("type", "string");
            break;
        case DrBase::Integer:
        case DrBase::Float:
            elem.setAttribute("type", (opt->type() == DrBase::Integer ? "int" : "float"));
            elem.setAttribute("min", opt->get("minval"));
            elem.setAttribute("max", opt->get("maxval"));
            break;
        case DrBase::Boolean:
        case DrBase::List:
            elem.setAttribute("type", (opt->type() == DrBase::List ? "list" : "bool"));
            {
                TQPtrListIterator<DrBase>   it(*(static_cast<DrListOption*>(opt)->choices()));
                for (; it.current(); ++it)
                {
                    TQDomElement    chElem = doc.createElement("value");
                    chElem.setAttribute("name", it.current()->name());
                    chElem.setAttribute("description", it.current()->get("text"));
                    elem.appendChild(chElem);
                }
            }
            break;
        default:
            break;
    }
 
    return elem;
}
 
//---------------------------------------------------------------------------------------------------
 
class KXmlCommandManager::KXmlCommandManagerPrivate
{
public:
    TQStringList    m_cmdlist;
    TQMap<TQString, TQValueList<KXmlCommand*> > m_mimemap;
    TQMap<TQString, KXmlCommand*>   m_cmdmap;
};
 
KXmlCommandManager* KXmlCommandManager::m_self = 0;
 
KXmlCommandManager* KXmlCommandManager::self()
{
    if (!m_self)
    {
        m_self = new KXmlCommandManager;
        TQ_CHECK_PTR(m_self);
    }
    return m_self;
}
 
KXmlCommandManager::KXmlCommandManager()
: TQObject(KMFactory::self(), "XmlCommandManager")
{
    d = new KXmlCommandManagerPrivate;
}
 
KXmlCommandManager::~KXmlCommandManager()
{
    cleanUp();
    delete d;
}
 
KXmlCommand* KXmlCommandManager::loadCommand(const TQString& xmlId, bool check)
{
    if (check)
    {
        TQString    desktopFile = locate("data", "tdeprint/filters/"+xmlId+".desktop");
        if (desktopFile.isEmpty())
            return 0;
    }
    return new KXmlCommand(xmlId);
}
 
void KXmlCommandManager::saveCommand(KXmlCommand *xmlCmd)
{
    xmlCmd->saveDesktop();
    xmlCmd->saveXml();
 
    cleanUp();
}
 
void KXmlCommandManager::cleanUp()
{
    for (TQMap<TQString, KXmlCommand*>::ConstIterator it=d->m_cmdmap.begin(); it!=d->m_cmdmap.end(); ++it)
        delete (*it);
    d->m_cmdmap.clear();
    d->m_mimemap.clear();
    d->m_cmdlist.clear();
}
 
void KXmlCommandManager::preload()
{
    if (d->m_cmdmap.count() == 0)
    {
        commandList();
        for (TQStringList::Iterator it=d->m_cmdlist.begin(); it!=d->m_cmdlist.end(); ++it)
        {
            KXmlCommand *xmlCmd = loadCommand(*it);
            if (!xmlCmd) continue; // Error!
 
            TQStringList    inputMime = xmlCmd->inputMimeTypes();
            for (TQStringList::ConstIterator mime=inputMime.begin(); mime!=inputMime.end(); ++mime)
            {
                d->m_mimemap[*mime].append(xmlCmd);
                d->m_cmdmap[*it] = xmlCmd;
            }
        }
    }
}
 
TQStringList KXmlCommandManager::commandList()
{
    if (d->m_cmdlist.isEmpty())
    {
        TQStringList    dirs = TDEGlobal::dirs()->findDirs("data", "tdeprint/filters/");
 
        for (TQStringList::ConstIterator it=dirs.begin(); it!=dirs.end(); ++it)
        {
            TQStringList    list = TQDir(*it).entryList("*.desktop", TQDir::Files, TQDir::Unsorted);
            for (TQStringList::ConstIterator it2=list.begin(); it2!=list.end(); ++it2)
            {
                TQString    cmdName = (*it2).left((*it2).length()-8);
                if (d->m_cmdlist.find(cmdName) == d->m_cmdlist.end())
                    d->m_cmdlist.append(cmdName);
            }
        }
 
        d->m_cmdlist.sort();
    }
 
    return d->m_cmdlist;
}
 
TQStringList KXmlCommandManager::commandListWithDescription()
{
    preload();
    TQStringList    l;
    for (TQMap<TQString,KXmlCommand*>::ConstIterator it=d->m_cmdmap.begin(); it!=d->m_cmdmap.end(); ++it)
        l << (*it)->name() << (*it)->description();
 
    return l;
}
 
TQString KXmlCommandManager::selectCommand(TQWidget *parent)
{
    KLibrary *lib = KLibLoader::self()->library( "libtdeprint_management_module" );
    if ( !lib )
    {
        KMessageBox::error( parent, i18n( "Unable to load TDE print management library: %1" ).arg( KLibLoader::self()->lastErrorMessage() ) );
        return TQString::null;
    }
    else
    {
        TQString ( *func )( TQWidget* ) = ( TQString( * )( TQWidget* ) )lib->symbol( "select_command" );
        if ( !func )
        {
            KMessageBox::error( parent, i18n( "Unable to find wizard object in management library." ) );
            return TQString::null;
        }
        else
            return func( parent );
    }
}
 
KXmlCommand* KXmlCommandManager::command(const TQString& xmlId) const
{
    return (d->m_cmdmap.contains(xmlId) ? d->m_cmdmap[xmlId] : 0);
}
 
int KXmlCommandManager::insertCommand(TQStringList& list, const TQString& filtername, bool defaultToStart)
{
    preload();
 
    int pos(0);
    KXmlCommand *f1 = command(filtername), *f2 = 0;
    if (f1 && f1->inputMimeTypes().count() > 0)
    {
        TQString    mimetype = f1->inputMimeTypes()[0];
        for (TQStringList::Iterator it=list.begin(); it!=list.end(); ++it, pos++)
        {
            f2 = command(*it);
            if (!f2)
                return -1; // Shouldn't happen
 
            if (f2->acceptMimeType(f1->mimeType()) && f1->acceptMimeType(mimetype))
            {
                list.insert(it, filtername);
                break;
            }
            else
            {
                mimetype = f2->mimeType();
                f2 = 0;
            }
        }
        if (pos == (int)(list.count()))
        {
            if (list.count() == 0 || f1->acceptMimeType(mimetype))
                list.append(filtername);
            else if (defaultToStart)
            {
                pos = 0;
                list.prepend(filtername);
            }
            else
                pos = -1;
        }
    }
    return pos;
}
 
TQStringList KXmlCommandManager::autoConvert(const TQString& mimesrc, const TQString& mimedest)
{
    TQStringList    chain;
    uint        score(0);
 
    preload();
 
    if (d->m_mimemap.contains(mimesrc))
    {
        const TQValueList<KXmlCommand*> l = d->m_mimemap[mimesrc];
        for (TQValueList<KXmlCommand*>::ConstIterator it=l.begin(); it!=l.end(); ++it)
        {
            // check filter availability
            if (!KdeprintChecker::check((*it)->requirements()))
                continue;
 
            // direct filter: shortest path => return immediately
            if ((*it)->mimeType() == mimedest)
            {
                chain = TQStringList((*it)->name());
                break;
            }
            // non direct filter: find the shortest way between
            // its output and mimedest (do not consider cyling filters)
            else if ((*it)->mimeType() != mimesrc)
            {
                TQStringList    subchain = autoConvert((*it)->mimeType(), mimedest);
                // If chain length is 0, then there's no possible filter between those 2
                // mime types. Just discard it. If the subchain contains also the current
                // considered filter, then discard it: it denotes of a cycle in filter
                // chain.
                if (subchain.count() > 0 && subchain.findIndex((*it)->name()) == -1)
                {
                    subchain.prepend((*it)->name());
                    if (subchain.count() < score || score == 0)
                    {
                        chain = subchain;
                        score = subchain.count();
                    }
                }
            }
        }
    }
    // At this point, either we have the shortest path, or empty
    // list if nothing could be found
    return chain;
}
 
bool KXmlCommandManager::checkCommand(const TQString& xmlId, int inputCheck, int outputCheck, TQString *msg)
{
    KXmlCommand *xmlCmd = command(xmlId);
    TQString    errmsg;
    bool    needDestroy(false);
    //kdDebug(500) << "checking command: " << xmlId << " (" << (xmlCmd != NULL) << ")" << endl;
    if (!xmlCmd)
    {
        xmlCmd = loadCommand(xmlId, true);
        needDestroy = (xmlCmd != 0);
    }
 
    bool    status(true);
    if (xmlCmd)
    {
        status = (xmlCmd->isValid() && KdeprintChecker::check(xmlCmd->requirements()));
        if (!status)
            errmsg = i18n("One of the command object's requirements is not met.");
    }
    TQString    cmd = (xmlCmd ? xmlCmd->command() : xmlId);
    if (status && !cmd.isEmpty() && (inputCheck > None || outputCheck > None))
    {
        if (inputCheck > None && (cmd.find("%in") == -1 || inputCheck == Advanced) && cmd.find("%filterinput") == -1)
        {
            status = false;
            errmsg = i18n("The command does not contain the required tag %1.").arg(inputCheck == Advanced ? "%filterinput" : "{%in,%filterinput}");
        }
        if (status && outputCheck > None && (cmd.find("%out") == -1 || outputCheck == Advanced) && cmd.find("filteroutput") == -1)
        {
            status = false;
            errmsg = i18n("The command does not contain the required tag %1.").arg(outputCheck == Advanced ? "%filteroutput" : "{%out,%filteroutput}");
        }
    }
 
    if (needDestroy)
        delete xmlCmd;
 
    if (msg)
        *msg = errmsg;
 
    return status;
}
 
bool KXmlCommandManager::configure(KXmlCommand *xmlCmd, TQWidget *parent)
{
    if (xmlCmd->driver())
    {
        KDialogBase dlg(parent, 0, true, xmlCmd->description(), KDialogBase::Ok);
        DriverView  view(&dlg);
 
        dlg.setMainWidget(&view);
        view.setDriver(xmlCmd->driver());
        dlg.resize(350,400);
        dlg.exec();
 
        return true;
    }
    return false;
}