Alternatives to gh_repl() for gtk app?

[Chris Baker]

I'd like to have an repl just like the guile repl in my gtk app.  The
problem is I can't just hand over control to gh_repl(), since I have
to hand over control to gtk.  I can arrange to get a callback when
there's input available, and I can evaluate it, but I'd like to reuse
as much of the existing code as possible, so I can use the debugging
facilities, etc.  I had a look through boot-9.scm, but it wasn't
immediately clear to me what was going on, so I'm not quite sure how
best to procede.  Does anyone have any ideas?

tia,

cbb