From b3ed1078585dfa840af967491abdc39b7afe9806 Mon Sep 17 00:00:00 2001
From: Wouter Deconinck <wdconinc@gmail.com>
Date: Mon, 7 Aug 2023 12:25:06 -0500
Subject: [PATCH] feat: eAST physics list plugin for npsim

---
 CMakeLists.txt                         |  8 +++++
 src/east/CMakeLists.txt                | 18 +++++++++++
 src/east/src/eASTPhysicsListPlugin.cxx | 44 ++++++++++++++++++++++++++
 3 files changed, 70 insertions(+)
 create mode 100644 src/east/CMakeLists.txt
 create mode 100644 src/east/src/eASTPhysicsListPlugin.cxx

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1d0e6ea..241d94c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,10 @@ endif()
 # libfmt
 find_package(fmt REQUIRED)
 
+# eAST
+find_package(east)
+message(STATUS "Found eAST: ${east_DIR}")
+
 #-----------------------------------------
 # add the library sub directories
 add_subdirectory(src/plugins)
@@ -82,6 +86,10 @@ add_subdirectory(src/geocad)
 add_subdirectory(src/config)
 add_subdirectory(src/tools)
 
+if(TARGET east::eASTPhysicsListBase)
+  add_subdirectory(src/east)
+endif()
+
 #----------------------------------------------------------------------------
 # Install and export targets
 install(EXPORT NPDetTargets
diff --git a/src/east/CMakeLists.txt b/src/east/CMakeLists.txt
new file mode 100644
index 0000000..ba61081
--- /dev/null
+++ b/src/east/CMakeLists.txt
@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+
+find_package(east)
+
+dd4hep_add_plugin(eASTPhysicsListPlugin
+  SOURCES
+    src/eASTPhysicsListPlugin.cxx
+  INCLUDES $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+  USES DD4hep::DDCore DD4hep::DDG4 east::eASTPhysicsListBase
+)
+
+install(TARGETS eASTPhysicsListPlugin
+  EXPORT NPDetTargets
+  LIBRARY DESTINATION lib
+  ARCHIVE DESTINATION lib
+  RUNTIME DESTINATION bin
+  INCLUDES DESTINATION include
+)
diff --git a/src/east/src/eASTPhysicsListPlugin.cxx b/src/east/src/eASTPhysicsListPlugin.cxx
new file mode 100644
index 0000000..a5d1516
--- /dev/null
+++ b/src/east/src/eASTPhysicsListPlugin.cxx
@@ -0,0 +1,44 @@
+// Framework include files
+#include <DD4hep/Printout.h>
+#include <DD4hep/InstanceCount.h>
+#include <DDG4/Factories.h>
+#include <DDG4/Geant4Random.h>
+#include <DDG4/Geant4Context.h>
+#include <DDG4/Geant4InputHandling.h>
+#include <DDG4/Geant4Action.h>
+#include <DDG4/Geant4PhysicsList.h>
+
+// eAST include files
+#include <eAST/eASTPhysicsList.hh>
+
+namespace dd4hep { 
+  namespace sim {
+
+    // Wrapper for eASTPhysicsList
+    class eASTPhysicsListPlugin : public G4VPhysicsConstructor {
+    protected:
+      /// Reference to eAST physics list object
+      eASTPhysicsList* m_eASTPhysicsList{nullptr};
+
+    public:
+      /// Standard constructor
+      eASTPhysicsListPlugin()
+      : G4VPhysicsConstructor() {
+        m_eASTPhysicsList = new eASTPhysicsList();
+      };
+      /// Default destructor
+      virtual ~eASTPhysicsListPlugin() = default;
+
+      virtual void ConstructParticle() {
+        m_eASTPhysicsList->ConstructParticle();
+      };
+      virtual void ConstructProcess() {
+        m_eASTPhysicsList->ConstructProcess();
+      }
+    };
+
+    DECLARE_GEANT4_PHYSICS(eASTPhysicsListPlugin)
+
+  }     /* End namespace sim   */
+}       /* End namespace dd4hep */
+