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feat: allow over to accept multiple functions and compose them

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Edward Langley
2023-04-13 09:29:22 -07:00
parent 08302fae40
commit 9c4d29543b
2 changed files with 29 additions and 4 deletions
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27
lens.lisp
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@ -291,10 +291,29 @@
seq
:initial-value ()))))
(defun over (fun &key (result-type 'list))
(let ((fun (functionalize fun)))
(lambda (seq)
(map result-type fun seq))))
(defun over (fun &rest funs)
(let* ((fun (functionalize fun))
(rt-pos (position :result-type funs))
(result-type (cond
((null rt-pos) 'list)
((>= (1+ rt-pos)
(length funs))
(error "invalid result-type"))
(t
(elt funs (1+ rt-pos)))))
(funs (if rt-pos
(append (mapcar #'functionalize
(subseq funs 0 rt-pos))
(mapcar #'functionalize
(subseq funs (+ rt-pos 2))))
(mapcar #'functionalize funs)))
(combined-fun (if funs
(apply #'alexandria:compose fun funs)
fun)))
(lambda (seq &rest seqs)
(if seqs
(apply #'map result-type combined-fun seq seqs)
(map result-type combined-fun seq)))))
(defun denest (&key (result-type 'list))
(lambda (seq)