[libcalamares] Additional convenience function extracting int

src/libcalamares/utils/CalamaresUtils.cpp

@@ -352,6 +352,20 @@ getString(const QVariantMap& map, const QString& key)
     return QString();
 }
 
+int
+getInteger( const QVariantMap& map, const QString& key, int d )
+{
+    int result = d;
+    if ( map.contains( key ) )
+    {
+        auto v = map.value( key );
+        if ( v.type() == QVariant::Int )
+            result = v.toInt();
+    }
+
+    return result;
+}
+
 QVariantMap
 getSubMap( const QVariantMap& map, const QString& key, bool& success )
 {

src/libcalamares/utils/CalamaresUtils.h

@@ -109,6 +109,11 @@ namespace CalamaresUtils
      */
     DLLEXPORT QString getString( const QVariantMap& map, const QString& key );
 
+    /**
+     * Get an integer value from a mapping; returns @p default if no value.
+     */
+    DLLEXPORT int getInteger( const QVariantMap& map, const QString& key, int d );
+
     /**
      * Returns a sub-map (i.e. a nested map) from the given mapping with the
      * given key. @p success is set to true if the @p key exists