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authorAndrew Tropin <andrew@trop.in>2021-08-27 09:58:56 +0300
committerOleg Pykhalov <go.wigust@gmail.com>2021-09-09 19:54:54 +0300
commita0a914a9a4aa38f66eac828065f114ebfa424e10 (patch)
tree70a6af87befda9d725d93d5a9e3133c7fc98faac /gnu/home-services
parent6d2e3168ce9efd5149cb093b253ed1ce0ff4c3c2 (diff)
home-services: Add helper functions for service configurations.
* 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>
Diffstat (limited to 'gnu/home-services')
-rw-r--r--gnu/home-services/configuration.scm81
1 files changed, 81 insertions, 0 deletions
diff --git a/gnu/home-services/configuration.scm b/gnu/home-services/configuration.scm
new file mode 100644
index 0000000000..039877b5c1
--- /dev/null
+++ b/gnu/home-services/configuration.scm
@@ -0,0 +1,81 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
+;;;
+;;; 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)
+
+ #: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)))