XPost: comp.lang.scheme

(defun sans (plist &rest keys)
"Returns PLIST with keyword arguments from KEYS removed."
;; stolen from Usenet posting <3247672165664225@naggum.no> by
;; Erik Naggum
(let ((sans ()))
(loop
(let ((tail (nth-value 2 (get-properties plist keys))))
;; this is how it ends
(unless tail
(return (nreconc sans plist)))
;; copy all the unmatched keys
(loop until (eq plist tail) do
(push (pop plist) sans)
(push (pop plist) sans))
;; skip the matched key
(setq plist (cddr plist))))))

Gauche Scheme:

(delete-keywords '(b d) '(a 0 b 1 c 2 d 3))


(a 0 c 2)

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