allow command-line edit function to use GUI editor * file-editor-interface.h (file_editor_interface::handle_edit_file_request): New pure virtual function. * file-editor.h, file-editor.cc (file_editor::handle_edit_file_request): New function. * octave-event-listener.h (octave_event_listenter::edit_file): New pure virtual function. * octave-qt-event-listener.h, octave-qt-event-listener.cc (octave_qt_event_listener::edit_file): New function. (octave_qt_event_listener::edit_file_signal): New signal. * main-window.h, main-window.cc (main_window::handle_edit_file_request): New function. (main_window::construct): Connect edit_file_signal to handle_edit_file_request. * __execute_edit_hook__.cc: New file. Provide Fadd_edit_hook, Fremove_edit_hook, and F__execute_edit_hook__ functions for the interpreter. * libinterp/corefcn/module.mk (COREFCN_SRC): Include it in the list. * octave-link.h, octave-link.cc (octave_link::edit_file, octave_link::do_edit_file): New functions. * octave-main-thread.cc (edit_hook_fcn): New function. (octave_main_thread::run): Install it as an edit_hook function. * miscellaneous/edit.m (do_edit): New subfunction. Allow edit request to be intercepted by edit_hook function. (edit): Use it to uniformly handle starting the editor.

--- a/libgui/src/octave-adapter/octave-link.h
+++ b/libgui/src/octave-adapter/octave-link.h
@@ -165,6 +165,13 @@
       instance->do_update_breakpoint_hook_fcn (insert, args);
   }
 
+  static void
+  edit_file (const octave_value_list& args)
+  {
+    if (instance_ok ())
+      instance->do_edit_file (args);
+  }
+
 private:
 
   static octave_link *instance;
@@ -236,6 +243,8 @@
   void do_exit_debugger_event_hook_fcn (const octave_value_list& args);
   void do_update_breakpoint_hook_fcn (bool insert,
                                       const octave_value_list& args);
+
+  void do_edit_file (const octave_value_list& args);
 };
 
 #endif // OCTAVELINK_H