REPL access

I've found Helma's shell in the browser to be really handy. However, I
feel it might be more convenient to be able to use the Helma shell in
other environments. I've found MozRepl to be a great example of how
this could work. (http://dev.hyperstruct.net/mozlab/wiki/MozRepl)
It lets you access a javascript REPL from either the command line via
telnet or even in Emacs (in the style of Slime for Common Lisp).

Is there anything like this currently existing in Helma? If there's a
simple REPL available but no editor integration, I would love to write
up some Emacs support for such a feature. It would probably not be too
difficult to adapt MozRepl's code for Helma.

-Phil