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| | (define-module (gnu home-services configuration)
#:use-module (gnu services configuration)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:export (filter-configuration-fields
interpose
list-of
list-of-strings?
alist?
string-or-gexp?
serialize-string-or-gexp
text-config?
serialize-text-config))
(define* (filter-configuration-fields configuration-fields fields
#:optional negate?)
"Retrieve the fields listed in FIELDS from CONFIGURATION-FIELDS.
If NEGATE? is @code{#t}, retrieve all fields except FIELDS."
(filter (lambda (field)
(let ((member? (member (configuration-field-name field) fields)))
(if (not negate?) member? (not member?))))
configuration-fields))
(define* (interpose ls #:optional (delimiter "\n") (grammar 'infix))
"Same as @code{string-join}, but without join and string, returns an
DELIMITER interposed LS. Support 'infix and 'suffix GRAMMAR values."
(when (not (member grammar '(infix suffix)))
(raise
(formatted-message
(G_ "The GRAMMAR value must be 'infix or 'suffix, but ~a provided.")
grammar)))
(fold-right (lambda (e acc)
(cons e
(if (and (null? acc) (eq? grammar 'infix))
acc
(cons delimiter acc))))
'() ls))
(define (list-of pred?)
"Return a procedure that takes a list and check if all the elements of
the list result in @code{#t} when applying PRED? on them."
(lambda (x)
(if (list? x)
(every pred? x)
#f)))
(define list-of-strings?
(list-of string?))
(define alist? list?)
(define (string-or-gexp? sg) (or (string? sg) (gexp? sg)))
(define (serialize-string-or-gexp field-name val) "")
(define (text-config? config)
(and (list? config) (every string-or-gexp? config)))
(define (serialize-text-config field-name val)
#~(string-append #$@(interpose val "\n" 'suffix)))
|