66 lines
2.0 KiB
Racket
66 lines
2.0 KiB
Racket
(module utils racket/base
|
|
|
|
(provide while
|
|
until
|
|
get-lib-path
|
|
do-for
|
|
)
|
|
|
|
(define-syntax while
|
|
(syntax-rules ()
|
|
((_ cond body ...)
|
|
(letrec ((while-f (lambda (last-result)
|
|
(if cond
|
|
(let ((last-result (begin
|
|
body
|
|
...)))
|
|
(while-f last-result))
|
|
last-result))))
|
|
(while-f #f))
|
|
)
|
|
))
|
|
|
|
(define-syntax until
|
|
(syntax-rules ()
|
|
((_ cond body ...)
|
|
(letrec ((until-f (lambda (last-result)
|
|
(if cond
|
|
last-result
|
|
(let ((last-reult (begin
|
|
body
|
|
...)))
|
|
(until-f last-result))))))
|
|
(until-f #f)))))
|
|
|
|
(define-syntax do-for
|
|
(syntax-rules ()
|
|
((_ (init cond next) body ...)
|
|
(begin
|
|
init
|
|
(letrec ((do-for-f (lamba ()
|
|
(if cond
|
|
(begin
|
|
(begin
|
|
body
|
|
...)
|
|
next
|
|
(do-for-f))))))
|
|
(do-for-f))))))
|
|
|
|
(define (get-lib-path lib)
|
|
(let ((platform (system-type)))
|
|
(cond
|
|
[(eq? platform 'windows)
|
|
(let ((try1 (build-path (current-directory) ".." "lib" "dll" lib))
|
|
(try2 (build-path (current-directory) "lib" "dll" lib)))
|
|
(if (file-exists? try1)
|
|
try1
|
|
try2)
|
|
)]
|
|
[else
|
|
(error (format "Install the shared library: ~a" lib))]
|
|
)))
|
|
|
|
|
|
) ; end of module
|