Hello all, I'm attempting to port the sdl-mixer egg (originally by
Christian Kellermann) from 4 to 5. I think I've made most of the
necessary changes, but I'm running into a bit of an issue and would
greatly appreciate some help troubleshooting.
I'm a bit new to Chicken and lisp in general, and while I feel I have a
decent understanding of regular macros the er- and ir-macro-transformer
procedures are still eluding me somewhat. In sdl-mixer's chicken 4
source, we have the macro
(module sdl-mixer-lolevel
(import ... srfi-1 ...)
...
(define-syntax --sdl-flags
(lambda (e r c)
`(,(r 'begin)
,@(append-map (lambda (str)
(let* ((sym (string->symbol str))
(psym (string->symbol (string-append "-" str))))
`((,(r 'define-foreign-variable) ,psym unsigned-integer ,str)
(,(r 'define) ,sym ,psym))))
(cdr e)))))
...
) ; end module
Looking through various chicken documentation, my first assumption was
to wrap the lambda argument to define-syntax in an er-macro-transformer
call. However this does not recognize append-map (of course defined in
srfi-1) as bound. I thought that it might also need to be renamed with
(r 'append-map) but this also did not work.
Since I am new to Chicken, I assume its a misunderstanding on my part of
what is necessary, but I cannot figure out where to go from here. So
first of all, is my assumption that I need an er-macro-transformer
correct, or am I barking up the wrong tree? Second, after resolving the
first question what is the next step I need to take? Any help would be
greatly appreciated.
Thanks in advance,
Andrew Mack
