[partition] Refactor PartitionEntry

- add a constructor that parses size and min
 - minor reduction in code duplication

src/modules/partition/core/PartitionLayout.cpp

@@ -102,18 +102,20 @@ parseSizeString( const QString& sizeString, PartitionLayout::SizeUnit* unit )
     return value;
 }
 
+PartitionLayout::PartitionEntry::PartitionEntry(const QString& size, const QString& min)
+{
+    partSize = parseSizeString( size , &partSizeUnit );
+    if ( !min.isEmpty() )
+        partMinSize = parseSizeString( min , &partMinSizeUnit );
+}
+
 void
 PartitionLayout::addEntry( const QString& mountPoint, const QString& size, const QString& min )
 {
-    PartitionLayout::PartitionEntry entry;
+    PartitionLayout::PartitionEntry entry( size, min );
 
     entry.partMountPoint = mountPoint;
     entry.partFileSystem = FileSystem::Ext4;
-    entry.partSize = parseSizeString( size , &entry.partSizeUnit );
-    if (min.isEmpty())
-        entry.partMinSize = 0;
-    else
-        entry.partMinSize = parseSizeString( min , &entry.partMinSizeUnit );
 
     partLayout.append( entry );
 }
@@ -121,16 +123,11 @@ PartitionLayout::addEntry( const QString& mountPoint, const QString& size, const
 void
 PartitionLayout::addEntry( const QString& label, const QString& mountPoint, const QString& fs, const QString& size, const QString& min )
 {
-    PartitionLayout::PartitionEntry entry;
+    PartitionLayout::PartitionEntry entry( size, min );
 
     entry.partLabel = label;
     entry.partMountPoint = mountPoint;
     entry.partFileSystem = FileSystem::typeForName( fs );
-    entry.partSize = parseSizeString( size , &entry.partSizeUnit );
-    if (min.isEmpty())
-        entry.partMinSize = 0;
-    else
-        entry.partMinSize = parseSizeString( min , &entry.partMinSizeUnit );
 
     partLayout.append( entry );
 }

src/modules/partition/core/PartitionLayout.h

@@ -53,6 +53,11 @@ public:
         SizeUnit partSizeUnit = Percent;
         double partMinSize = 0.0L;
         SizeUnit partMinSizeUnit = Percent;
+
+        /// @brief All-zeroes PartitionEntry
+        PartitionEntry() {};
+        /// @brief Parse @p size and @p min to their respective member variables
+        PartitionEntry( const QString& size, const QString& min );
     };
 
     PartitionLayout();