add runstartend to subsystem

Author: Spaceman113138

commands2/subsystem.py

@@ -168,6 +168,22 @@ def startRun(self, start: Callable[[], None], run: Callable[[], None]) -> Comman
 
         return startRun(start, run, self)
 
+    def startRunEnd(self, start: Callable[[], None], run: Callable[[], None], end: Callable[[], None]) -> Command:
+        """
+        Constructs a command that runs an action once, and then runs an action
+        every iteration until interrupted, and then runs a third action.
+        every iteration until interrupted, and then runs a third action. Requires 
+        this subsystem.
+        
+        :param start the action to run on start
+        :param run the action to run every iteration
+        :param end the action to run on interrupt
+        :returns: the command
+        """
+        from .cmd import startRunEnd
+
+        return startRunEnd(start, run, end, self)
+
     def idle(self) -> Command:
         """
         Constructs a command that does nothing until interrupted. Requires this subsystem.