use of C++ API for running a file (bug #42307) * octave-cmd.cc: New file providing the new command class octave_cmd; (prepare_command_editor): common action that all derived command classes use for method execute; (octave_cmd_exec::execute): execute method of derived class for executing ordinary commands in the terminal; (octave_cmd_eval::execute): execute method of derived class for running a file (as function if it is a valid identifier or as script) * octave-cmd.h: providing base and derived classes * main-window.cc (main_window): _cmd_queue is not a pointer anymore; (~main_window): _cmd_queue is not a pointer anymore; (execute_command_in_terminal): use new command class for queuing a command; (run_file_in_terminal): check for valid identifier moved from here to the execute method of the related command class; (run_file_callback): use new class for queuing command, path check moved from here into the execute method of the command class; (queue_command): gets new command class instead of a string as input; (closeEvent): queue command class instead of string; (execute_command_callback): command queue contains command class instances; * main-window.h: use new octave-cmd class for queue_command, the command queue is not a pointer anymore * module.mk: new files octave-cmd.cc and octave-cmd.h

--- a/libgui/src/main-window.h
+++ b/libgui/src/main-window.h
@@ -57,6 +57,7 @@
 #include "octave-qt-link.h"
 #include "octave-dock-widget.h"
 #include "find-files-dialog.h"
+#include "octave-cmd.h"
 
 class settings_dialog;
 
@@ -276,7 +277,7 @@
 
   void change_directory_callback (const std::string& directory);
 
-  void queue_command (QString command);
+  void queue_command (octave_cmd *cmd);
 
   void queue_debug (QString command);
 
@@ -396,8 +397,12 @@
   // Flag for closing whole application.
   bool _closing;
 
-  // semaphore to synchronize execution signals and related callback
-  QStringList *_cmd_queue;
+  // command queue and semaphore to synchronize execution signals
+  // and related callback
+
+  // the queue for the command structures
+  QList<octave_cmd *> _cmd_queue;
+  // semaphores used for handling the queue
   QSemaphore   _cmd_processing;
   QMutex       _cmd_queue_mutex;