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* gnu/home-services/configuration.scm (helper functions): New variables. * gnu/local.mk (GNU_SYSTEM_MODULES): Add home-services/configuration.scm. Signed-off-by: Oleg Pykhalov <go.wigust@gmail.com>
81 lines
2.7 KiB
Scheme
81 lines
2.7 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu home-services configuration)
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#:use-module (gnu services configuration)
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#:use-module (guix gexp)
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#:use-module (srfi srfi-1)
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#:export (filter-configuration-fields
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interpose
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list-of
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list-of-strings?
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alist?
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string-or-gexp?
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serialize-string-or-gexp
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text-config?
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serialize-text-config))
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(define* (filter-configuration-fields configuration-fields fields
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#:optional negate?)
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"Retrieve the fields listed in FIELDS from CONFIGURATION-FIELDS.
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If NEGATE? is @code{#t}, retrieve all fields except FIELDS."
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(filter (lambda (field)
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(let ((member? (member (configuration-field-name field) fields)))
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(if (not negate?) member? (not member?))))
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configuration-fields))
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(define* (interpose ls #:optional (delimiter "\n") (grammar 'infix))
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"Same as @code{string-join}, but without join and string, returns an
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DELIMITER interposed LS. Support 'infix and 'suffix GRAMMAR values."
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(when (not (member grammar '(infix suffix)))
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(raise
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(formatted-message
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(G_ "The GRAMMAR value must be 'infix or 'suffix, but ~a provided.")
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grammar)))
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(fold-right (lambda (e acc)
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(cons e
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(if (and (null? acc) (eq? grammar 'infix))
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acc
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(cons delimiter acc))))
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'() ls))
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(define (list-of pred?)
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"Return a procedure that takes a list and check if all the elements of
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the list result in @code{#t} when applying PRED? on them."
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(lambda (x)
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(if (list? x)
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(every pred? x)
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#f)))
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(define list-of-strings?
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(list-of string?))
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(define alist? list?)
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(define (string-or-gexp? sg) (or (string? sg) (gexp? sg)))
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(define (serialize-string-or-gexp field-name val) "")
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(define (text-config? config)
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(and (list? config) (every string-or-gexp? config)))
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(define (serialize-text-config field-name val)
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#~(string-append #$@(interpose val "\n" 'suffix)))
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