From 39ed843346a337c4e1e8687f9f802a34367108ba Mon Sep 17 00:00:00 2001
From: Ian Hinder <ian.hinder@aei.mpg.de>
Date: Fri, 13 Sep 2013 16:27:09 +0200
Subject: Move differencing code processing from KrancThorn.m to Differencing.m

---
 Tools/CodeGen/Differencing.m | 28 +++++++++++++++++++++++++++-
 Tools/CodeGen/KrancThorn.m   | 19 +------------------
 2 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/Tools/CodeGen/Differencing.m b/Tools/CodeGen/Differencing.m
index 2071fe7..983c9c0 100644
--- a/Tools/CodeGen/Differencing.m
+++ b/Tools/CodeGen/Differencing.m
@@ -135,7 +135,7 @@ point. TODO: Should be checked by someone competent!
 
 BeginPackage["Differencing`", {"CodeGen`", "CodeGenC`", "CodeGenCactus`", "CodeGenKranc`",
                                "Kranc`", "MapLookup`", 
-             (* "LinearAlgebra`MatrixManipulation`", *) "Errors`"}];
+             (* "LinearAlgebra`MatrixManipulation`", *) "Errors`", "Code`", "Object`"}];
 
 CreateDifferencingHeader::usage = "";
 PrecomputeDerivatives::usage = "";
@@ -154,6 +154,7 @@ spacing::usage = "";
 ComponentDerivativeOperatorStencilWidth::usage = "";
 CheckStencil::usage = "";
 StencilSize::usage = "";
+DifferencingProcessCode;
 
 GridFunctionDerivativeToDef;
 
@@ -802,6 +803,31 @@ expandDerivOpOverParameters[op_, intParams_] :=
       {op},
       expandDerivOpOverParameter[op, usedParams[[1]]]]];
 
+
+Options[DifferencingProcessCode] = ThornOptions;
+
+DefFn[
+  DifferencingProcessCode[cIn_Code, opts:OptionsPattern[]] :=
+  Module[
+    {diffHeader, pDefs, c = cIn},
+    InfoMessage[Terse, "Creating differencing header file"];
+    {pDefs, diffHeader} = CreateDifferencingHeader[
+      GetObjectField[c, "PartialDerivatives"], OptionValue[ZeroDimensions],
+      OptionValue[UseVectors], OptionValue[IntParameters]];
+    c = SetObjectField[c, "Calculations", Map[Join[#, {PreDefinitions -> pDefs}] &, GetObjectField[c, "Calculations"]]];
+    diffHeader = Join[
+      If[OptionValue[UseVectors] && ! OptionValue[UseOpenCL],
+         {"#include <assert.h>\n",
+          "#include \"vectors.h\"\n",
+          "\n"},
+         {}],
+      diffHeader];
+    (* TODO: fix circular dependency which stops us from importing OpenCL in this package *)
+    If[OptionValue[UseOpenCL], diffHeader = OpenCL`OpenCLProcessDifferencingHeader[diffHeader]];
+    AppendObjectField[
+      c, "Sources",
+      {Filename -> "Differencing.h", Contents -> diffHeader}]]];
+
 End[];
 
 EndPackage[];
diff --git a/Tools/CodeGen/KrancThorn.m b/Tools/CodeGen/KrancThorn.m
index 8231a3a..c8bf952 100644
--- a/Tools/CodeGen/KrancThorn.m
+++ b/Tools/CodeGen/KrancThorn.m
@@ -345,24 +345,7 @@ CreateKrancThorn[groupsOrig_, parentDirectory_, thornName_, opts:OptionsPattern[
        Create finite differencing header file
        ------------------------------------------------------------------------ *)
 
-    Module[
-      {diffHeader, pDefs},
-      InfoMessage[Terse, "Creating differencing header file"];
-      {pDefs, diffHeader} = CreateDifferencingHeader[
-        GetObjectField[c, "PartialDerivatives"], OptionValue[ZeroDimensions],
-        OptionValue[UseVectors], OptionValue[IntParameters]];
-      c = SetObjectField[c, "Calculations", Map[Join[#, {PreDefinitions -> pDefs}] &, GetObjectField[c, "Calculations"]]];
-      diffHeader = Join[
-        If[OptionValue[UseVectors] && ! OptionValue[UseOpenCL],
-           {"#include <assert.h>\n",
-            "#include \"vectors.h\"\n",
-            "\n"},
-           {}],
-        diffHeader];
-      If[OptionValue[UseOpenCL], diffHeader = OpenCLProcessDifferencingHeader[diffHeader]];
-      c = AppendObjectField[
-        c, "Sources",
-        {Filename -> "Differencing.h", Contents -> diffHeader}]];
+    c = DifferencingProcessCode[c, opts];
 
     (* ------------------------------------------------------------------------ 
        Create calculation source files
-- 
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