centralize initialization of thread params from config

include/picongpu/plugins/openPMD/openPMDWriter.def

@@ -56,6 +56,19 @@ namespace openPMD
         ADIOS,
         HDF5
     };
+
+
+    /**
+     * Writes simulation data to openPMD series.
+     * Implements the ILightweightPlugin interface.
+     */
+
+    class openPMDWriter;
+    class Help;
+    // passes through to openPMDWriter constructor
+    // used to avoid forward declaring the constructor
+    template< typename ... Args >
+    openPMDWriter makeOpenPMDWriter( Args && ... );
 
     struct ThreadParams
     {
@@ -74,6 +87,10 @@ namespace openPMD
         std::string
             fileName; /* Name of the openPMDSeries, excluding the extension */
         std::string fileExtension; /* Extension of the file name */
+        std::string fileInfix;
+
+        std::string jsonConfig;
+
         WriteSpeciesStrategy strategy = WriteSpeciesStrategy::ADIOS;
 
         pmacc::math::UInt64< simDim > fieldsSizeDims;
@@ -97,6 +114,13 @@ namespace openPMD
 
         void
         closeSeries();
+
+        void
+        initFromConfig( 
+            Help &, 
+            size_t id, 
+            std::string const & file,
+            std::string const & dir );
 
         inline bool
         isADIOS1();
@@ -121,12 +145,5 @@ namespace openPMD
             bool compression,
             std::string const & compressionMethod );
     };
-
-    /**
-     * Writes simulation data to openPMD series.
-     * Implements the ILightweightPlugin interface.
-     */
-
-    class openPMDWriter;
 } // namespace openPMD
 } // namespace picongpu