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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu home-services configuration)
#:use-module (gnu services configuration)
#:use-module (guix gexp)
#:use-module (srfi srfi-1)
#:use-module (ice-9 curried-definitions)
#:use-module (ice-9 match)
#:use-module (guix i18n)
#:use-module (guix diagnostics)
#:export (filter-configuration-fields
interpose
list-of
list-of-strings?
alist?
string-or-gexp?
serialize-string-or-gexp
text-config?
serialize-text-config
generic-serialize-alist-entry
generic-serialize-alist))
(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)))
(define ((generic-serialize-alist-entry serialize-field) entry)
"Apply the SERIALIZE-FIELD procedure on the field and value of ENTRY."
(match entry
((field . val) (serialize-field field val))))
(define (generic-serialize-alist combine serialize-field fields)
"Generate a configuration from an association list FIELDS.
SERIALIZE-FIELD is a procedure that takes two arguments, it will be
applied on the fields and values of FIELDS using the
@code{generic-serialize-alist-entry} procedure.
COMBINE is a procedure that takes one or more arguments and combines
all the alist entries into one value, @code{string-append} or
@code{append} are usually good candidates for this.
See the @code{serialize-alist} procedure in `@code{(gnu home-services
version-control}' for an example usage.)}"
(apply combine
(map (generic-serialize-alist-entry serialize-field) fields)))
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