Re: [Chicken-users] Question about embedding Chicken scheme

[Christian Kellermann]

Hi Julian!

* Day, Julian <address@hidden> [130120 02:51]:

> I apologize in advance if this is a stupid question.  I am writing
> a roguelike game, and would like to use an embedded language for
> doing quests and NPC dialogue.  I've seen lots of information on
> using Lua for these sorts of things, but I would like to use Scheme
> because, well, I like coding in Scheme.  Is it possible to, from
> the C++ code, call Scheme scripts, which would be able to call C/C++
> functions to modify some game state in singleton instances?  Is
> this the way I should be thinking about the problem, or should I
> be thinking about passing the state to/from the Scheme procedures?
> Or is there a different approach I should use?

This is an excellent question! Yes, you can use chicken as an
embedded scripting language for your game. The manual has a section
dedicated to that topic (embedding not games unfortunately):
http://api.call-cc.org/doc/foreign/embedding

See for an introduction into embedding. From a gut feeling I'd say
that providing callable accessors for your scheme script to modify
your game state is easier than passing around a lot of state all
the time since all this state would have to be transformed into a
scheme object and back to C/C++...

So far people that use embedding have not spoken out loudly on this
list, but I am sure there are people using this feature. That would
be your clue guys! What are your experiences?

You will most probably have lots of questions, feel free to come
back and ask again. We value your feedback (and maybe that will
lead to better documentation in the first place).

Have fun using chicken!

Christian

-- 
In the world, there is nothing more submissive and weak than
water. Yet for attacking that which is hard and strong, nothing can
surpass it. --- Lao Tzu