Allow setting well group for new well in job, with list of existing groups

ApplicationLibCode/FileInterface/RifOpmFlowDeckFile.cpp

@@ -533,6 +533,30 @@ bool RifOpmFlowDeckFile::isRestartFile()
     return pos.has_value();
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+std::set<std::string> RifOpmFlowDeckFile::wellGroupsInFile()
+{
+    std::set<std::string> values;
+
+    if ( m_fileDeck.get() == nullptr ) return values;
+
+    for ( auto it = m_fileDeck->start(); it != m_fileDeck->stop(); it++ )
+    {
+        auto& kw = m_fileDeck->operator[]( it );
+        if ( kw.name() == Opm::ParserKeywords::WELSPECS::keywordName )
+        {
+            for ( int i = 0; i < (int)kw.size(); i++ )
+            {
+                auto& item = kw.getRecord( i ).getItem( Opm::ParserKeywords::WELSPECS::GROUP::itemName );
+                values.insert( item.get<std::string>( 0 ) );
+            }
+        }
+    }
+    return values;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/FileInterface/RifOpmFlowDeckFile.h

@@ -21,6 +21,7 @@
 #include <ctime>
 #include <memory>
 #include <optional>
+#include <set>
 #include <string>
 #include <vector>
 
@@ -61,6 +62,8 @@ public:
     std::vector<std::string> dateStrings();
     std::vector<std::time_t> dates();
 
+    std::set<std::string> wellGroupsInFile();
+
     std::vector<int> welldims();
     bool             setWelldims( int maxWells, int maxConnections, int maxGroups, int maxWellsInGroup );