diff --git a/sources/awesome-widget/plugin/awkeys.cpp b/sources/awesome-widget/plugin/awkeys.cpp
index fb26ab2..ae08f4b 100644
--- a/sources/awesome-widget/plugin/awkeys.cpp
+++ b/sources/awesome-widget/plugin/awkeys.cpp
@@ -26,6 +26,7 @@
 #include <QNetworkInterface>
 #include <QProcessEnvironment>
 #include <QRegExp>
+#include <QScriptEngine>
 #include <QSettings>
 #include <QStandardPaths>
 #include <QThread>
@@ -131,6 +132,8 @@ QString AWKeys::parsePattern() const
 
     QString parsed = pattern;
     parsed.replace(QString("$$"), QString("$\\$\\"));
+    foreach(QString key, foundLambdas)
+        parsed.replace(QString("${{%1}}").arg(key), calculateLambda(key));
     foreach(QString key, foundKeys)
         parsed.replace(QString("$%1").arg(key), htmlValue(key));
     foreach(QString bar, foundBars)
@@ -820,6 +823,7 @@ void AWKeys::reinitKeys()
     keys = dictKeys();
     foundBars = findGraphicalItems();
     foundKeys = findKeys();
+    foundLambdas = findLambdas();
 }
 
 
@@ -868,6 +872,27 @@ void AWKeys::addKeyToCache(const QString type, const QString key)
 }
 
 
+QString AWKeys::calculateLambda(QString key) const
+{
+    if (debug) qDebug() << PDEBUG;
+    if (debug) qDebug() << PDEBUG << ":" << "Lambda key" << key;
+
+    QScriptEngine engine;
+    foreach(QString lambdaKey, foundKeys)
+        key.replace(QString("$%1").arg(lambdaKey), values[lambdaKey]);
+    if (debug) qDebug() << PDEBUG << ":" << "Expression" << key;
+
+    QScriptValue result = engine.evaluate(key);
+    if (engine.hasUncaughtException()) {
+        int line = engine.uncaughtExceptionLineNumber();
+        if (debug) qDebug() << PDEBUG << ":" << "Uncaught exception at line"
+                            << line << ":" << result.toString();
+        return QString();
+    } else
+        return result.toString();
+}
+
+
 QString AWKeys::htmlValue(QString key) const
 {
     if (debug) qDebug() << PDEBUG;
@@ -934,6 +959,8 @@ QStringList AWKeys::findGraphicalItems() const
 
 QStringList AWKeys::findKeys() const
 {
+    if (debug) qDebug() << PDEBUG;
+
     QStringList selectedKeys;
     foreach(QString key, keys) {
         if (key.startsWith(QString("bar"))) continue;
@@ -947,6 +974,31 @@ QStringList AWKeys::findKeys() const
 }
 
 
+QStringList AWKeys::findLambdas() const
+{
+    if (debug) qDebug() << PDEBUG;
+
+    QStringList selectedKeys;
+    // substring inside ${{ }} (with brackets) which should not contain ${{
+    QRegularExpression lambdaRegexp(QString("\\$\\{\\{((?!\\$\\{\\{).)*?\\}\\}"));
+    lambdaRegexp.setPatternOptions(QRegularExpression::DotMatchesEverythingOption);
+
+    QRegularExpressionMatchIterator it = lambdaRegexp.globalMatch(pattern);
+    while (it.hasNext()) {
+        QRegularExpressionMatch match = it.next();
+        QString lambda = match.captured();
+        // drop brakets
+        lambda.remove(QRegExp(QString("^\\$\\{\\{")));
+        lambda.remove(QRegExp(QString("\\}\\}$")));
+        // append
+        if (debug) qDebug() << PDEBUG << ":" << "Found lambda" << lambda;
+        selectedKeys.append(lambda);
+    }
+
+    return selectedKeys;
+}
+
+
 GraphicalItem *AWKeys::getItemByTag(const QString tag) const
 {
     if (debug) qDebug() << PDEBUG;
diff --git a/sources/awesome-widget/plugin/awkeys.h b/sources/awesome-widget/plugin/awkeys.h
index 5f982ff..5917302 100644
--- a/sources/awesome-widget/plugin/awkeys.h
+++ b/sources/awesome-widget/plugin/awkeys.h
@@ -75,12 +75,14 @@ private slots:
 private:
     // methods
     void addKeyToCache(const QString type, const QString key = QString(""));
+    QString calculateLambda(QString key) const;
     QString htmlValue(QString key) const;
     int numberCpus() const;
     float temperature(const float temp, const QString units) const;
     // find methods
     QStringList findGraphicalItems() const;
     QStringList findKeys() const;
+    QStringList findLambdas() const;
     // get methods
     GraphicalItem *getItemByTag(const QString tag) const;
     QStringList getTimeKeys() const;
@@ -94,7 +96,7 @@ private:
     ExtItemAggregator<ExtUpgrade> *extUpgrade;
     ExtItemAggregator<ExtWeather> *extWeather;
     QString pattern;
-    QStringList foundBars, foundKeys, keys;
+    QStringList foundBars, foundKeys, foundLambdas, keys;
     QHash<QString, QString> values;
     QStringList diskDevices, hddDevices, mountDevices, networkDevices, tempDevices;
 };
diff --git a/sources/awesomewidgets/extitemaggregator.h b/sources/awesomewidgets/extitemaggregator.h
index ecd4062..e3dc0d4 100644
--- a/sources/awesomewidgets/extitemaggregator.h
+++ b/sources/awesomewidgets/extitemaggregator.h
@@ -67,21 +67,35 @@ public:
         m_items = getItems();
     };
 
+    T *itemByTagNumber(const int _number) const
+    {
+        if (debug) qDebug() << PDEBUG;
+
+        T *found = nullptr;
+        foreach(T *item, m_items) {
+            if (item->number() != _number) continue;
+            found = item;
+            break;
+        }
+
+        return found;
+    }
+
     T *itemFromWidget() const
     {
         if (debug) qDebug() << PDEBUG;
 
-        QListWidgetItem *item = widgetDialog->currentItem();
-        if (item == nullptr) return nullptr;
+        QListWidgetItem *widgetItem = widgetDialog->currentItem();
+        if (widgetItem == nullptr) return nullptr;
 
-        int originalItem = -1;
-        for (int i=0; i<m_items.count(); i++) {
-            if (m_items.at(i)->fileName() != item->text()) continue;
-            originalItem = i;
+        T *found = nullptr;
+        foreach(T *item, m_items) {
+            if (item->fileName() != widgetItem->text()) continue;
+            found = item;
             break;
         }
 
-        return originalItem == -1 ? nullptr : m_items[originalItem];
+        return found;
     };
 
     QList<T *> items() const
diff --git a/sources/desktop-panel/package/contents/ui/advanced.qml b/sources/desktop-panel/package/contents/ui/advanced.qml
index fe40517..0545f65 100644
--- a/sources/desktop-panel/package/contents/ui/advanced.qml
+++ b/sources/desktop-panel/package/contents/ui/advanced.qml
@@ -29,7 +29,7 @@ Item {
     DPAdds {
         id: dpAdds;
     }
-    
+
     width: childrenRect.width
     height: childrenRect.height
     implicitWidth: pageColumn.implicitWidth
diff --git a/sources/libraries.cmake b/sources/libraries.cmake
index f0153df..cb34cf8 100644
--- a/sources/libraries.cmake
+++ b/sources/libraries.cmake
@@ -1,5 +1,5 @@
 find_package(Gettext REQUIRED)
-find_package(Qt5 REQUIRED COMPONENTS Core DBus Network Qml Widgets)
+find_package(Qt5 REQUIRED COMPONENTS Core DBus Network Script Qml Widgets)
 find_package(ECM 0.0.11 REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR})
 find_package(KF5 REQUIRED COMPONENTS I18n Notifications Plasma Service WindowSystem)
@@ -10,16 +10,16 @@ include(KDECompilerSettings)
 
 add_definitions(
     ${Qt5Core_DEFINITIONS} ${Qt5DBus_DEFINITIONS} ${Qt5Network_DEFINITIONS}
-    ${Qt5Qml_DEFINITIONS} ${Qt5Widgets_DEFINITIONS}
+    ${Qt5Script_DEFINITIONS} ${Qt5Qml_DEFINITIONS} ${Qt5Widgets_DEFINITIONS}
 )
 set(Qt_INCLUDE
     ${Qt5Core_INCLUDE_DIRS} ${Qt5DBus_INCLUDE_DIRS} ${Qt5Network_INCLUDE_DIRS}
-    ${Qt5Qml_INCLUDE_DIRS} ${Qt5Widgets_INCLUDE_DIRS}
+    ${Qt5Script_INCLUDE_DIRS} ${Qt5Qml_INCLUDE_DIRS} ${Qt5Widgets_INCLUDE_DIRS}
 )
 set(Kf5_INCLUDE ${I18n_INCLUDE_DIR} ${Notifications_INCLUDE_DIR} ${Plasma_INCLUDE_DIR})
 
 set(Qt_LIBRARIES
     ${Qt5Core_LIBRARIES} ${Qt5DBus_LIBRARIES} ${Qt5Network_LIBRARIES}
-    ${Qt5Qml_LIBRARIES} ${Qt5Widgets_LIBRARIES}
+    ${Qt5Script_LIBRARIES} ${Qt5Qml_LIBRARIES} ${Qt5Widgets_LIBRARIES}
 )
 set(Kf5_LIBRARIES KF5::I18n KF5::Notifications KF5::Plasma KF5::WindowSystem)