Wrapping a GUI around flex-bison engine

[Andrej Prsa]

Hi Guys!

Sorry to be a bit off-topic here, but I was wondering if anyone can
suggest a good (perhaps the usual?) way of wrapping a graphical user
interface (GUI) around an interactive flex-bison engine?

In particular: I created a small engine that takes commands either from
external files (scripts) or interactively using readline library, creates
an AST and executes it. Now that I'm happy with that, I'd like to offer
users to click around rather than type around. I've searched the internet
for a nice approach for this, but I can't say I found the definitive
answer. In a nutshell, the GUI is supposed to supply the engine with
commands or sets of commands (in either AST form or in string-buffer
form), which are then executed. Furthermore, I'd like to have a
plugin-aware engine, so that new pieces of code may be added to expand the
basic functionality - I suppose the GUI is thus just one of perhaps many
plugins to the engine. So if you have any ideas or recommendations, I'd be
very grateful to hear them!

Thanks in advance,

Andrej