cleanup: replace Q_FOREACH and foreach by range base for

Q_FOREACH and foreach are anachronisms.

Range based for may cause a performance regression: it can
lead to a copy of shared containers (one reason why Qt's
COW containers are broken). However, as long as there is no
user noticeable delay, there is no point in analyzing each case.
And also no point in slapping an 'asConst' on every container
that is looped over.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

.clang-format

@@ -10,7 +10,7 @@ ColumnLimit: 0
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
 ConstructorInitializerIndentWidth: 8
 ContinuationIndentWidth: 8
-ForEachMacros: [ 'foreach', 'for_each_dc', 'for_each_relevant_dc', 'for_each_dive', 'for_each_line', 'Q_FOREACH' ]
+ForEachMacros: [ 'for_each_dc', 'for_each_relevant_dc', 'for_each_dive', 'for_each_line' ]
 IndentFunctionDeclarationAfterType: false #personal taste, good for long methods
 IndentWidth: 8
 MaxEmptyLinesToKeep: 2

core/downloadfromdcthread.cpp

@@ -156,7 +156,7 @@ void fill_computer_list()
 		descriptorLookup[QString(vendor).toLower() + QString(product).toLower()] = descriptor;
 	}
 	dc_iterator_free(iterator);
-	Q_FOREACH (QString vendor, vendorList) {
+	for (const QString &vendor: vendorList) {
 		auto &l = productList[vendor];
 		std::sort(l.begin(), l.end());
 	}
@@ -194,9 +194,9 @@ void show_computer_list()
 {
 	unsigned int transportMask = get_supported_transports(NULL);
 	qDebug() << "Supported dive computers:";
-	Q_FOREACH (QString vendor, vendorList) {
+	for (const QString &vendor: vendorList) {
 		QString msg = vendor + ": ";
-		Q_FOREACH (QString product, productList[vendor]) {
+		for (const QString &product: productList[vendor]) {
 			dc_descriptor_t *descriptor = descriptorLookup[vendor.toLower() + product.toLower()];
 			unsigned int transport = dc_descriptor_get_transports(descriptor) & transportMask;
 			QString transportString = getTransportString(transport);

core/parse-gpx.cpp

@@ -47,7 +47,7 @@ int getCoordsFromGPXFile(struct dive_coords *coords, const QString &fileName)
 			if (nameCmp(gpxReader, "trkpt") == 0) {
 				trkpt_found = true;
 				line++;
-				foreach (const QXmlStreamAttribute &attr, gpxReader.attributes()) {
+				for (const QXmlStreamAttribute &attr: gpxReader.attributes()) {
 					if (attr.name().toString() == QLatin1String("lat"))
 						lat = attr.value().toString().toDouble();
 					else if (attr.name().toString() == QLatin1String("lon"))

core/qt-ble.cpp

@@ -308,7 +308,7 @@ dc_status_t BLEObject::write(const void *data, size_t size, size_t *actual)
 		} while (!receivedPackets.isEmpty());
 	}
 
-	foreach (const QLowEnergyCharacteristic &c, preferredService()->characteristics()) {
+	for (const QLowEnergyCharacteristic &c: preferredService()->characteristics()) {
 		if (!is_write_characteristic(c))
 			continue;
 
@@ -398,7 +398,7 @@ dc_status_t BLEObject::read(void *data, size_t size, size_t *actual)
 dc_status_t BLEObject::select_preferred_service(void)
 {
 	// Wait for each service to finish discovering
-	foreach (const QLowEnergyService *s, services) {
+	for (const QLowEnergyService *s: services) {
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 		WAITFOR(s->state() != QLowEnergyService::RemoteServiceDiscovering, BLE_TIMEOUT);
 		if (s->state() == QLowEnergyService::RemoteServiceDiscovering)
@@ -410,19 +410,19 @@ dc_status_t BLEObject::select_preferred_service(void)
 	}
 
 	// Print out the services for debugging
-	foreach (const QLowEnergyService *s, services) {
+	for (const QLowEnergyService *s: services) {
 		qDebug() << "Found service" << s->serviceUuid() << s->serviceName();
 
-		foreach (const QLowEnergyCharacteristic &c, s->characteristics()) {
+		for (const QLowEnergyCharacteristic &c: s->characteristics()) {
 			qDebug() << "   c:" << c.uuid();
 
-			foreach (const QLowEnergyDescriptor &d, c.descriptors())
+			for (const QLowEnergyDescriptor &d: c.descriptors())
 				qDebug() << "        d:" << d.uuid();
 		}
 	}
 
 	// Pick the preferred one
-	foreach (QLowEnergyService *s, services) {
+	for (QLowEnergyService *s: services) {
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 		if (s->state() != QLowEnergyService::RemoteServiceDiscovered)
 #else
@@ -434,7 +434,7 @@ dc_status_t BLEObject::select_preferred_service(void)
 		bool haswrite = false;
 		QBluetoothUuid uuid = s->serviceUuid();
 
-		foreach (const QLowEnergyCharacteristic &c, s->characteristics()) {
+		for (const QLowEnergyCharacteristic &c: s->characteristics()) {
 			hasread |= is_read_characteristic(c);
 			haswrite |= is_write_characteristic(c);
 		}
@@ -615,9 +615,8 @@ dc_status_t qt_ble_open(void **io, dc_context_t *, const char *devaddr, device_d
 	// Finish discovering the services, then add all those services and discover their characteristics.
 	ble->connect(controller, &QLowEnergyController::discoveryFinished, [=] {
 		qDebug() << "finished service discovery, start discovering characteristics";
-		foreach(QBluetoothUuid s, controller->services()) {
+		for (QBluetoothUuid s: controller->services())
 			ble->addService(s);
-		}
 	});
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
 	ble->connect(controller, &QLowEnergyController::errorOccurred, [=](QLowEnergyController::Error newError) {

core/qthelper.cpp

@@ -1176,7 +1176,7 @@ QStringList mediaExtensionFilters()
 QStringList imageExtensionFilters()
 {
 	QStringList filters;
-	foreach (const QString &format, QImageReader::supportedImageFormats())
+	for (QString format: QImageReader::supportedImageFormats())
 		filters.append("*." + format);
 	return filters;
 }

desktop-widgets/divelistview.cpp

@@ -486,7 +486,7 @@ void DiveListView::selectionChanged(const QItemSelection &selected, const QItemS
 	QItemSelection newSelected = selected.size() ? selected : selectionModel()->selection();
 
 	std::vector<dive *> addToSelection, removeFromSelection;
-	Q_FOREACH (const QModelIndex &index, newDeselected.indexes()) {
+	for (const QModelIndex &index: newDeselected.indexes()) {
 		if (index.column() != 0)
 			continue;
 		const QAbstractItemModel *model = index.model();
@@ -499,7 +499,7 @@ void DiveListView::selectionChanged(const QItemSelection &selected, const QItemS
 				removeFromSelection.push_back(trip->dives.dives[i]);
 		}
 	}
-	Q_FOREACH (const QModelIndex &index, newSelected.indexes()) {
+	for (const QModelIndex &index: newSelected.indexes()) {
 		if (index.column() != 0)
 			continue;
 

desktop-widgets/divelogimportdialog.cpp

@@ -495,7 +495,7 @@ void DiveLogImportDialog::loadFileContents(int value, whatChanged triggeredBy)
 		firstLine = f.readLine().trimmed();
 
 		currColumns = firstLine.split(';');
-		Q_FOREACH (QString columnText, currColumns) {
+		for (const QString &columnText: currColumns) {
 			if (columnText == "Time") {
 				headers.append("Sample time");
 			} else if (columnText == "Depth") {
@@ -613,7 +613,7 @@ void DiveLogImportDialog::loadFileContents(int value, whatChanged triggeredBy)
 		if (line.length() > 0)
 			columns = line.split(separator);
 		// now try and guess the columns
-		Q_FOREACH (QString columnText, currColumns) {
+		for (QString columnText: currColumns) {
 			count++;
 			/*
 			 * We have to skip the conversion of 2 to ₂ for APD Log

desktop-widgets/groupedlineedit.cpp

@@ -99,7 +99,7 @@ void GroupedLineEdit::addColor(QColor color)
 QStringList GroupedLineEdit::getBlockStringList()
 {
 	QStringList retList;
-	foreach (const Private::Block &block, d->blocks)
+	for (const Private::Block &block: d->blocks)
 		retList.append(block.text);
 	return retList;
 }
@@ -179,7 +179,7 @@ void GroupedLineEdit::paintEvent(QPaintEvent *e)
 
 	QVectorIterator<QColor> i(d->colors);
 	i.toFront();
-	foreach (const Private::Block &block, d->blocks) {
+	for (const Private::Block &block: d->blocks) {
 		qreal start_x = line.cursorToX(block.start, QTextLine::Leading);
 		qreal end_x = line.cursorToX(block.end-1, QTextLine::Trailing);
 

desktop-widgets/kmessagewidget.cpp

@@ -111,7 +111,7 @@ void KMessageWidgetPrivate::createLayout()
     qDeleteAll(buttons);
     buttons.clear();
 
-    Q_FOREACH (QAction *action, q->actions()) {
+    for (QAction *action: q->actions()) {
         QToolButton *button = new QToolButton(content);
         button->setDefaultAction(action);
         button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
@@ -131,7 +131,7 @@ void KMessageWidgetPrivate::createLayout()
 
         QHBoxLayout *buttonLayout = new QHBoxLayout;
         buttonLayout->addStretch();
-        Q_FOREACH (QToolButton *button, buttons) {
+        for (QToolButton *button: buttons) {
             // For some reason, calling show() is necessary if wordwrap is true,
             // otherwise the buttons do not show up. It is not needed if
             // wordwrap is false.
@@ -145,9 +145,8 @@ void KMessageWidgetPrivate::createLayout()
         layout->addWidget(iconLabel);
         layout->addWidget(textLabel);
 
-        Q_FOREACH (QToolButton *button, buttons) {
+        for (QToolButton *button: buttons)
             layout->addWidget(button);
-        }
 
         layout->addWidget(closeButton);
     };

desktop-widgets/mainwindow.cpp

@@ -379,7 +379,7 @@ void MainWindow::on_actionOpen_triggered()
 	QStringList cleanFilenames;
 	QRegularExpression reg(".*\\[[^]]+]\\.ssrf", QRegularExpression::CaseInsensitiveOption);
 
-	Q_FOREACH (QString filename, filenames) {
+	for (QString filename: filenames) {
 		if (reg.match(filename).hasMatch())
 			filename.remove(QRegularExpression("\\.ssrf$", QRegularExpression::CaseInsensitiveOption));
 		cleanFilenames << filename;
@@ -1071,7 +1071,7 @@ void MainWindow::loadRecentFiles()
 	recentFiles.clear();
 	QSettings s;
 	s.beginGroup("Recent_Files");
-	foreach (const QString &key, s.childKeys()) {
+	for (const QString &key: s.childKeys()) {
 		// TODO Sorting only correct up to 9 entries. Currently, only 4 used, so no problem.
 		if (!key.startsWith("File_"))
 			continue;

desktop-widgets/preferences/preferences_language.cpp

@@ -27,7 +27,7 @@ PreferencesLanguage::PreferencesLanguage() : AbstractPreferencesWidget(tr("Langu
 	dateFormatShortMap.insert("MM/dd/yyyy", "M/d/yy");
 	dateFormatShortMap.insert("dd.MM.yyyy", "d.M.yy");
 	dateFormatShortMap.insert("yyyy-MM-dd", "yy-M-d");
-	foreach (QString format, dateFormatShortMap.keys())
+	for (const QString &format: dateFormatShortMap.keys())
 		ui->dateFormatEntry->addItem(format);
 	ui->dateFormatEntry->completer()->setCaseSensitivity(Qt::CaseSensitive);
 	connect(ui->dateFormatEntry, &QComboBox::currentTextChanged,

desktop-widgets/templatelayout.cpp

@@ -55,7 +55,7 @@ void set_bundled_templates_as_read_only()
 		listStats[i] = stats + QDir::separator() + listStats.at(i);
 	list += listStats;
 
-	foreach (const QString& f, list)
+	for (const QString &f: list)
 		QFile::setPermissions(pathUser + QDir::separator() + f, QFileDevice::ReadOwner | QFileDevice::ReadUser);
 }
 

mobile-widgets/qmlmanager.cpp

@@ -2365,13 +2365,13 @@ QStringList QMLManager::cloudCacheList() const
 	QDir localCacheDir(QString("%1/cloudstorage/").arg(system_default_directory()));
 	QStringList dirs = localCacheDir.entryList();
 	QStringList result;
-	foreach(QString dir, dirs) {
+	for (const QString &dir: dirs) {
 		QString originsDir = QString("%1/cloudstorage/%2/.git/refs/remotes/origin/").arg(system_default_directory()).arg(dir);
 		QDir remote(originsDir);
 		if (dir == "localrepo") {
 			result << QString("localrepo[master]");
 		} else {
-			foreach(QString branch, remote.entryList().filter(QRegularExpression("...+")))
+			for (const QString &branch: remote.entryList().filter(QRegularExpression("...+")))
 				result << QString("%1[%2]").arg(dir).arg(branch);
 		}
 	}

qt-models/maplocationmodel.cpp

@@ -216,8 +216,7 @@ void MapLocationModel::setSelected(const QVector<dive_site *> &divesites)
 
 MapLocation *MapLocationModel::getMapLocation(const struct dive_site *ds)
 {
-	MapLocation *location;
-	foreach(location, m_mapLocations) {
+	for (MapLocation *location: m_mapLocations) {
 		if (ds == location->divesite)
 			return location;
 	}

qt-models/models.cpp

@@ -64,7 +64,7 @@ LanguageModel *LanguageModel::instance()
 LanguageModel::LanguageModel(QObject *parent) : QAbstractListModel(parent)
 {
 	QDir d(getSubsurfaceDataPath("translations"));
-	Q_FOREACH (const QString &s, d.entryList()) {
+	for (const QString &s: d.entryList()) {
 		if (s.startsWith("subsurface_") && s.endsWith(".qm")) {
 			languages.push_back((s == "subsurface_source.qm") ? "English" : s);
 		}

scripts/whitespace.pl

@@ -3,7 +3,7 @@
 my $input = $ARGV[0];
 my $source = `clang-format $input`;
 
-# for_each_dive (...) and Q_FOREACH and friends...
+# for_each_dive (...) and friends...
 $source =~ s/(?:\G|^)(.*each.*\(.*) \* (\S.*\))$/$1 *$2/img; # if a variable is declared in the argument, '*' is an indicator for a pointer, not arithmatic
 $source =~ s/(?:\G|^)(.*each.*\(.*) \& (\S.*\))$/$1 &$2/img; # if a variable is declared in the argument, '&' is an indicator for a reference, not bit logic
 $source =~ s/(?:\G|^)(.*each[^\s(]*)\s*(\(.*)$/$1 $2/img;    # we want exactly one space between keyword and opening parenthesis '('