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(define-module (pypi utils)
#:use-module (ice-9 match)
#:use-module (srfi srfi-69)
#:use-module (guix packages)
#:export (all-combinations))
; Combinatorics
(define (combinations lst len)
(cond ((= len 0)
'(()))
((null? lst)
'())
(else (append (map (lambda (rest) (cons (car lst) rest))
(combinations (cdr lst) (- len 1)))
(combinations (cdr lst) len)))))
(define (all-combinations lst)
(apply
append
(map
(lambda (len)
(combinations lst len))
(cdr (iota (+ 1 (length lst)))))))
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