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/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
#include "history.hh"
#include "config.hh"
#include "atomic_rename.hh"
#include <QFile>
History::History( unsigned size ): maxSize( size ),
addingEnabled( true )
{
}
History::History( Load, unsigned size ): maxSize( size ),
addingEnabled( true )
{
QFile file( Config::getHistoryFileName() );
if ( !file.open( QFile::ReadOnly | QIODevice::Text ) )
return; // No file -- no history
for( unsigned count = 0 ; count < maxSize; ++count )
{
QByteArray lineUtf8 = file.readLine( 4096 );
if ( lineUtf8.isEmpty() )
break;
if ( lineUtf8.endsWith( '\n' ) )
lineUtf8.chop( 1 );
QString line = QString::fromUtf8( lineUtf8 );
int firstSpace = line.indexOf( ' ' );
if ( firstSpace < 0 )
// No spaces? Bad line. End this.
break;
bool isNumber;
unsigned groupId = line.left( firstSpace ).toUInt( &isNumber, 10 );
if ( !isNumber )
break; // That's not right
items.push_back( Item( groupId, line.right( line.size() - firstSpace - 1 ) ) );
}
}
void History::addItem( Item const & item )
{
if( !enabled() )
return;
if ( item.word.size() > 60 )
{
// The search looks bogus. Don't save it.
return;
}
if ( items.contains( item ) )
items.removeAll( item );
// Special case: if this items differs from the previous one only by group,
// remove it too.
if ( items.size() && items.first().word == item.word )
items.pop_front();
items.push_front( item );
while( items.size() > (int)maxSize )
items.pop_back();
emit itemsChanged();
}
bool History::save() const
{
QFile file( Config::getHistoryFileName() + ".tmp" );
if ( !file.open( QFile::WriteOnly | QIODevice::Text ) )
return false;
for( QList< Item >::const_iterator i = items.constBegin();
i != items.constEnd(); ++i )
{
QByteArray line = i->word.toUtf8();
// Those could ruin our format, so we replace them by spaces. They shouldn't
// be there anyway.
line.replace( '\n', ' ' );
line.replace( '\r', ' ' );
line = QByteArray::number( i->groupId ) + " " + line + "\n";
if ( file.write( line ) != line.size() )
return false;
}
file.close();
return renameAtomically( file.fileName(), Config::getHistoryFileName() );
}
void History::clear()
{
items.clear();
emit itemsChanged();
}
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