78 lines
1.9 KiB
Scheme
78 lines
1.9 KiB
Scheme
(module utils
|
|
(get-env-var
|
|
set-working-directory
|
|
to-absolute-pathname
|
|
list-split
|
|
list-join
|
|
recons
|
|
with-directory
|
|
)
|
|
|
|
(import
|
|
scheme
|
|
(chicken base)
|
|
(chicken pathname)
|
|
(chicken process-context)
|
|
srfi-1)
|
|
|
|
(define-syntax prog1
|
|
(syntax-rules ()
|
|
((prog1 form . forms)
|
|
(let ((res form))
|
|
(begin . forms)
|
|
res))))
|
|
|
|
(define-syntax with-directory
|
|
(syntax-rules ()
|
|
((with-directory path form . forms)
|
|
(let ((current-dir (current-directory)))
|
|
(set-working-directory path)
|
|
(prog1
|
|
(begin form . forms)
|
|
(change-directory current-dir))))))
|
|
|
|
(define (get-env-var name)
|
|
(get-environment-variable name))
|
|
|
|
(define (set-working-directory file)
|
|
(change-directory
|
|
(normalize-pathname
|
|
(if (absolute-pathname? file)
|
|
(pathname-directory file)
|
|
(make-absolute-pathname
|
|
(current-directory)
|
|
(pathname-directory file))))))
|
|
|
|
(define (to-absolute-pathname pathname)
|
|
(if (absolute-pathname? pathname)
|
|
pathname
|
|
(make-absolute-pathname
|
|
(current-directory)
|
|
pathname)))
|
|
|
|
(define (list-split src-list split-elt)
|
|
;; split '(1 2 / 3 4 / 5 6) by '/ -> '((1 2) (3 4) (5 6))
|
|
(fold (lambda (elt acc)
|
|
(if (eq? elt split-elt)
|
|
(append acc (list (list)))
|
|
(append (drop-right acc 1)
|
|
(list (append (last acc) (list elt))))))
|
|
(list (list))
|
|
src-list))
|
|
|
|
(define (list-join lists join-by)
|
|
(drop-right
|
|
(fold (lambda (elt acc)
|
|
(append acc (list elt) (list join-by)))
|
|
(list)
|
|
lists)
|
|
1))
|
|
|
|
;;; Reconstruct form
|
|
(define (recons old-cons new-car new-cdr)
|
|
(if (and (eq? new-car (car old-cons))
|
|
(eq? new-cdr (cdr old-cons)))
|
|
old-cons
|
|
(cons new-car new-cdr)))
|
|
)
|