Add basic manager class fro Python interpreter

opm/parser/eclipse/Python/Python.hpp

@@ -0,0 +1,65 @@
+/*
+  Copyright 2019 Equinor ASA.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPM_EMBEDDED_PYTHON
+#define OPM_EMBEDDED_PYTHON
+
+#include <memory>
+#include <string>
+
+
+namespace Opm {
+class PythonInterp;
+
+
+
+/*
+  This class is a thin wrapper around the PythonInterp class. The Python class
+  can always be safely instantiated, but the actual PythonInterp implementation
+  depends on whether Python support was enabled when this library instance was
+  compiled.
+
+  If one the methods actually invoking the Python interpreter is invoked without
+  proper Python support a dummy PythinInterp instance will be used; and that
+  will just throw std::logic_error. The operator bool can be used to check if
+  this Python manager indeed has a valid Python runtime:
+
+
+     Python python;
+
+     if (python)
+         python.exec("print('Hello world')")
+     else
+         OpmLog::Error("This version of opmcommon has been built with support for embedded Python");
+
+*/
+
+class Python {
+public:
+    Python();
+    bool exec(const std::string& python_code);
+    explicit operator bool() const;
+private:
+    std::shared_ptr<PythonInterp> interp;
+};
+}
+
+
+#endif
+