pySim-shell: obey quit command in startup commands+scripts

Startup scripts are executed using the cmd2 provided onecmd_plus_hooks
method. This method can run arbitrary commands, which also includes
the command "run_scrit" that we use to execute startup scripts.

When a script executes a quit command, or when someone issues a quit
command using the --execute-command or the command argument, then
this commands is executed. However a quit command won't actually quit
the process. All it does is to change the return code of
app.onecmd_plus_hooks (see [1]). So we must evaluate the return code
and take care of the quitting ourselves.

[1] https://cmd2.readthedocs.io/en/0.9.15/api/cmd.html#cmd2.cmd2.Cmd.onecmd_plus_hooks

Related: OS#6731
Change-Id: Ic6e9c54cdb6955d65011af3eb5a025eee5da4143

Author: pmaier-sysmo

pySim-shell.py

@@ -1159,14 +1159,18 @@ def receive_fetch(self, pcmd: ProactiveCommand):
     # Run optional commands
     for c in opts.execute_command:
         if not startup_errors:
-            app.onecmd_plus_hooks(c)
+            stop = app.onecmd_plus_hooks(c)
+            if stop == True:
+                sys.exit(0)
         else:
             print("Errors during startup, refusing to execute command (%s)" % c)
 
     # Run optional command
     if opts.command:
         if not startup_errors:
-            app.onecmd_plus_hooks('{} {}'.format(opts.command, ' '.join(opts.command_args)))
+            stop = app.onecmd_plus_hooks('{} {}'.format(opts.command, ' '.join(opts.command_args)))
+            if stop == True:
+                sys.exit(0)
         else:
             print("Errors during startup, refusing to execute command (%s)" % opts.command)
 
@@ -1177,7 +1181,9 @@ def receive_fetch(self, pcmd: ProactiveCommand):
                 print("Error: script file (%s) not readable!" % opts.script)
                 startup_errors = True
             else:
-                app.onecmd_plus_hooks('{} {}'.format('run_script', opts.script), add_to_history = False)
+                stop = app.onecmd_plus_hooks('{} {}'.format('run_script', opts.script), add_to_history = False)
+                if stop == True:
+                    sys.exit(0)
         else:
             print("Errors during startup, refusing to execute script (%s)" % opts.script)