Base: [skip ci] add method to more easily set the Python error indicator from a Base::Exception

src/App/ApplicationPy.cpp

@@ -223,8 +223,8 @@ PyObject* Application::sLoadFile(PyObject * /*self*/, PyObject *args)
         Py_Return;
     }
     catch (const Base::Exception& e) {
-        PyErr_SetString(PyExc_IOError, e.what());
-        return 0;
+        e.setPyException();
+        return nullptr;
     }
     catch (const std::exception& e) {
         // might be subclass from zipios

src/Base/Exception.cpp

@@ -28,6 +28,7 @@
 
 #include "Exception.h"
 #include "Console.h"
+#include "PyObjectBase.h"
 #include <CXX/Objects.hxx>
 
 FC_LOG_LEVEL_INIT("Exception", true, true)
@@ -148,6 +149,21 @@ void Exception::setPyObject( PyObject * pydict)
     }
 }
 
+PyObject * Exception::getPyExceptionType() const
+{
+    return BaseExceptionFreeCADError;
+}
+
+void Exception::setPyException() const
+{
+    PyObject* exc = getPyExceptionType();
+    if (!exc) {
+        exc = BaseExceptionFreeCADError;
+    }
+
+    PyErr_SetString(exc, what());
+}
+
 // ---------------------------------------------------------
 
 TYPESYSTEM_SOURCE(Base::AbortException,Base::Exception)

src/Base/Exception.h

@@ -126,7 +126,9 @@ public:
   virtual void setPyObject( PyObject * pydict);
 
   /// returns the corresponding python exception type
-  virtual PyObject * getPyExceptionType() const {return 0;}
+  virtual PyObject * getPyExceptionType() const;
+  /// Sets the Python error indicator and an error message
+  virtual void setPyException() const;
 
 protected:
  /* sMessage may be:

src/Base/Interpreter.cpp

@@ -146,6 +146,15 @@ void PyException::ReportException (void) const
     }
 }
 
+void PyException::setPyException() const
+{
+    std::stringstream str;
+    str << getStackTrace()
+        << getErrorType()
+        << ": " << what();
+    PyErr_SetString(getPyExceptionType(), str.str().c_str());
+}
+
 // ---------------------------------------------------------
 
 SystemExitException::SystemExitException()

src/Base/Interpreter.h

@@ -113,6 +113,8 @@ public:
     const std::string &getErrorType(void) const {return _errorType;}
     virtual PyObject *getPyExceptionType(void) const override {return _exceptionType;}
     void ReportException (void) const override;
+    /// Sets the Python error indicator and an error message
+    virtual void setPyException() const override;
 
 protected:
     std::string _stackTrace;