[partition] Consolidate SwapChoice handling

- pickOne() may be useful, given a set of swap choices; expose it
- move type definitions to PartitionActions, where some of them
  come from.

src/modules/partition/core/Config.cpp

@@ -28,7 +28,7 @@ Config::Config( QObject* parent )
 {
 }
 
-Config::SwapChoices
+static PartitionActions::Choices::SwapChoiceSet
 getSwapChoices( const QVariantMap& configurationMap )
 {
     // SWAP SETTINGS
@@ -53,7 +53,7 @@ getSwapChoices( const QVariantMap& configurationMap )
     }
     bool neverCreateSwap = CalamaresUtils::getBool( configurationMap, "neverCreateSwap", false );
 
-    Config::SwapChoices choices;  // Available swap choices
+    PartitionActions::Choices::SwapChoiceSet choices;  // Available swap choices
     if ( configurationMap.contains( "userSwapChoices" ) )
     {
         // We've already warned about overlapping settings with the

src/modules/partition/core/Config.h

@@ -36,10 +36,8 @@ public:
 
     void updateGlobalStorage() const;
 
-    using SwapChoices = QSet< PartitionActions::Choices::SwapChoice >;
-
 private:
-    SwapChoices m_swapChoices;
+    PartitionActions::Choices::SwapChoiceSet m_swapChoices;
     qreal m_requiredStorageGiB = 0.0;  // May duplicate setting in the welcome module
 };
 

src/modules/partition/core/PartitionActions.cpp

@@ -293,6 +293,25 @@ choiceToName( SwapChoice c )
     return nameTable().find( c, ok );
 }
 
+SwapChoice
+pickOne( const SwapChoiceSet& s )
+{
+    if ( s.count() == 0 )
+    {
+        return SwapChoice::NoSwap;
+    }
+    if ( s.count() == 1 )
+    {
+        return *( s.begin() );
+    }
+    if ( s.contains( SwapChoice::NoSwap ) )
+    {
+        return SwapChoice::NoSwap;
+    }
+    // Here, count > 1 but NoSwap is not a member.
+    return *( s.begin() );
+}
+
 }  // namespace Choices
 
 }  // namespace PartitionActions

src/modules/partition/core/PartitionActions.h

@@ -19,6 +19,7 @@
 #ifndef PARTITIONACTIONS_H
 #define PARTITIONACTIONS_H
 
+#include <QSet>
 #include <QString>
 
 class PartitionCoreModule;
@@ -42,10 +43,19 @@ enum SwapChoice
     FullSwap,  // ensureSuspendToDisk -- at least RAM size
     SwapFile  // use a file (if supported)
 };
+using SwapChoiceSet = QSet< SwapChoice >;
 
 SwapChoice nameToChoice( QString name, bool& ok );
 QString choiceToName( SwapChoice );
 
+/** @brief Given a set of swap choices, return a sensible value from it.
+ *
+ * "Sensible" here means: if there is one value, use it; otherwise, use
+ * NoSwap if there are no choices, or if NoSwap is one of the choices, in the set.
+ * If that's not possible, any value from the set.
+ */
+SwapChoice pickOne( const SwapChoiceSet& s );
+
 struct ReplacePartitionOptions
 {
     QString defaultFsType;  // e.g. "ext4" or "btrfs"

src/modules/partition/gui/ChoicePage.cpp

@@ -70,24 +70,6 @@ using CalamaresUtils::Partition::isPartitionFreeSpace;
 using CalamaresUtils::Partition::findPartitionByPath;
 using Calamares::PrettyRadioButton;
 
-/** @brief Given a set of swap choices, return a sensible value from it.
- *
- * "Sensible" here means: if there is one value, use it; otherwise, use
- * NoSwap if there are no choices, or if NoSwap is one of the choices, in the set.
- * If that's not possible, any value from the set.
- */
-SwapChoice pickOne( const SwapChoiceSet& s )
-{
-    if ( s.count() == 0 )
-        return SwapChoice::NoSwap;
-    if ( s.count() == 1 )
-        return *( s.begin() );
-    if ( s.contains( SwapChoice::NoSwap ) )
-        return SwapChoice::NoSwap;
-    // Here, count > 1 but NoSwap is not a member.
-    return *( s.begin() );
-}
-
 /**
  * @brief ChoicePage::ChoicePage is the default constructor. Called on startup as part of
  *      the module loading code path.
@@ -112,7 +94,7 @@ ChoicePage::ChoicePage( const SwapChoiceSet& swapChoices, QWidget* parent )
     , m_lastSelectedDeviceIndex( -1 )
     , m_enableEncryptionWidget( true )
     , m_availableSwapChoices( swapChoices )
-    , m_eraseSwapChoice( pickOne( swapChoices ) )
+    , m_eraseSwapChoice( PartitionActions::Choices::pickOne( swapChoices ) )
     , m_allowManualPartitioning( true )
 {
     setupUi( this );