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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)))