ENH: export FOAM_API in dictionary (issue #1158)

- uses the value of foamVersion::api, which should be reliable.

src/paraview-plugins/vtkPVFoam/vtkPVFoam.C

@@ -30,6 +30,7 @@ License
 #include "areaFaMesh.H"
 #include "faMesh.H"
 #include "fvMesh.H"
+#include "foamVersion.H"
 #include "Time.H"
 #include "patchZones.H"
 #include "IOobjectList.H"
@@ -314,6 +315,9 @@ Foam::vtkPVFoam::vtkPVFoam
         fullCasePath = cwd();
     }
 
+    // OPENFOAM API
+    setEnv("FOAM_API", std::to_string(foamVersion::api), true);
+
     // The name of the executable, unless already present in the environment
     setEnv("FOAM_EXECUTABLE", "paraview", false);
 

src/paraview-plugins/vtkPVblockMesh/vtkPVblockMesh.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2017 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2017-2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -29,6 +29,7 @@ License
 // OpenFOAM includes
 #include "blockMesh.H"
 #include "blockMeshTools.H"
+#include "foamVersion.H"
 #include "Time.H"
 #include "patchZones.H"
 #include "StringStream.H"
@@ -206,6 +207,9 @@ Foam::vtkPVblockMesh::vtkPVblockMesh
         fullCasePath = cwd();
     }
 
+    // OPENFOAM API
+    setEnv("FOAM_API", std::to_string(foamVersion::api), true);
+
     // The name of the executable, unless already present in the environment
     setEnv("FOAM_EXECUTABLE", "paraview", false);