13.combine_outputs.patch

diff --git a/src/outputs/outputs.cpp b/src/outputs/outputs.cpp
index b0550c95..b85b3198 100644
--- a/src/outputs/outputs.cpp
+++ b/src/outputs/outputs.cpp
@@ -800,6 +800,7 @@ void Outputs::MakeOutputs(Mesh *pm, ParameterInput *pin, bool wtflag) {
         first = false;
       }
       ptype->WriteOutputFile(pm, pin, wtflag);
+      ptype->CombineBlocks();
     }
     ptype = ptype->pnext_type; // move to next OutputType node in singly linked list
   }
diff --git a/src/outputs/outputs.hpp b/src/outputs/outputs.hpp
index 9e67c158..db327ef4 100644
--- a/src/outputs/outputs.hpp
+++ b/src/outputs/outputs.hpp
@@ -108,6 +108,7 @@ class OutputType {
   bool ContainVariable(const std::string &haystack, const std::string &needle);
   // following pure virtual function must be implemented in all derived classes
   virtual void WriteOutputFile(Mesh *pm, ParameterInput *pin, bool flag) = 0;
+  virtual void CombineBlocks() {}
 
  protected:
   int num_vars_;             // number of variables in output