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(define-module (guix-data-service model utils)
#:use-module (srfi srfi-1)
#:use-module (ice-9 vlist)
#:use-module (squee)
#:export (quote-string
value->quoted-string-or-null
exec-query->vhash
two-lists->vhash
deduplicate-strings))
(define (quote-string s)
(string-append "'" s "'"))
(define (value->quoted-string-or-null value)
(if (string? value)
(string-append "$STR$" value "$STR$")
"NULL"))
(define (exec-query->vhash conn query field-function value-function)
(fold (lambda (row result)
(vhash-cons (field-function row)
(value-function row)
result))
vlist-null
(exec-query conn query)))
(define (two-lists->vhash l1 l2)
(fold (lambda (key value result)
(vhash-cons key value result))
vlist-null
l1
l2))
(define (deduplicate-strings strings)
(pair-fold
(lambda (pair result)
(if (null? (cdr pair))
(cons (first pair) result)
(if (string=? (first pair) (second pair))
result
(cons (first pair) result))))
'()
(sort strings string<?)))
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