--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgui/src/interpreter-qobject.cc	Fri Jun 21 14:41:04 2019 -0500
@@ -0,0 +1,86 @@
+/*
+
+Copyright (C) 2013-2019 John W. Eaton
+Copyright (C) 2011-2019 Jacob Dawid
+
+This file is part of Octave.
+
+Octave 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.
+
+Octave 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 Octave; see the file COPYING.  If not, see
+<https://www.gnu.org/licenses/>.
+
+*/
+
+#if defined (HAVE_CONFIG_H)
+#  include "config.h"
+#endif
+
+#include "interpreter-qobject.h"
+#include "octave-gui.h"
+
+#include "input.h"
+#include "interpreter.h"
+
+namespace octave
+{
+  interpreter_qobject::interpreter_qobject (gui_application& app_context)
+    : QObject (), m_app_context (app_context)
+  { }
+
+  void interpreter_qobject::execute (void)
+  {
+    // The application context owns the interpreter.
+
+    interpreter& interp = m_app_context.create_interpreter ();
+
+    int exit_status = 0;
+
+    try
+      {
+        // Final initialization.
+
+        interp.initialize ();
+
+        if (m_app_context.start_gui_p ())
+          {
+            input_system& input_sys = interp.get_input_system ();
+
+            input_sys.PS1 (">> ");
+            input_sys.PS2 ("");
+          }
+
+        if (interp.initialized ())
+          {
+            // The interpreter should be completely ready at this point so let
+            // the GUI know.
+
+            emit octave_ready_signal ();
+
+            // Start executing commands in the command window.
+
+            exit_status = interp.execute ();
+          }
+      }
+    catch (const exit_exception& ex)
+      {
+        exit_status = ex.exit_status ();
+      }
+
+    // Whether or not initialization succeeds we need to clean up the
+    // interpreter once we are done with it.
+
+    m_app_context.delete_interpreter ();
+
+    emit octave_finished_signal (exit_status);
+  }
+}