gnu: home: services: Add home-znc-service-type.

* gnu/home/services/messaging.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* po/guix/POTFILES.in: Likewise.
* doc/guix.texi (Messaging Home Services): Document it in new subsection.

doc/guix.texi

@@ -41705,6 +41705,7 @@ services)}.
 * Guix: Guix Home Services.     Services for Guix.
 * Fonts: Fonts Home Services.   Services for managing User's fonts.
 * Sound: Sound Home Services.   Dealing with audio.
+* Messaging: Messaging Home Services.   Services for managing messaging.
 @end menu
 @c In addition to that Home Services can provide
 
@@ -42797,6 +42798,42 @@ Stopping the Shepherd service turns off broadcasting.
 This is the multicast address used by default by the two services above.
 @end defvar
 
+@node Messaging Home Services
+@subsection Messaging Home Services
+
+@cindex znc
+The @uref{https://znc.in, ZNC bouncer} can be run as a daemon to manage
+your IRC presence.  With the @code{(gnu home services znc)} service, you
+can configure ZNC to run upon login.
+
+You will have to provide a @file{~/.znc/configs/znc.conf} seperately.
+
+Here is an example of a service and its configuration that you could add
+to the @code{services} field of your @code{home-environment}:
+
+@lisp
+(service home-znc-service-type)
+@end lisp
+
+@defvr {Scheme Variable} home-znc-service-type
+This is the type of the @code{git daemon} home service, whose value is an
+@code{home-znc-configuration} object.
+@end defvr
+
+@deftp {Data Type} home-znc-configuration
+Available @code{home-znc-configuration} fields are:
+
+@table @asis
+@item @code{git} (default: @code{git}) (type: file-like)
+The git package to use.
+
+@item @code{extra-options} (default: @code{'()})
+Extra options will be passed to @command{znc}, please run @command{man
+znc} for more information.
+
+@end table
+@end deftp
+
 @node Invoking guix home
 @section Invoking @command{guix home}
 

gnu/home/services/messaging.scm

@@ -0,0 +1,73 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Janneke Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; 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 messaging)
+  #:use-module (srfi srfi-26)
+
+  #:use-module (ice-9 match)
+
+  #:use-module (shepherd support)
+
+  #:use-module (gnu home services)
+  #:use-module (gnu home services shepherd)
+  #:use-module (gnu packages messaging)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu services shepherd)
+  #:use-module (guix records)
+  #:use-module (guix gexp)
+
+  #:export (home-znc-configuration
+            home-znc-service-type))
+
+;;;
+;;; Znc.
+;;;
+(define-record-type* <home-znc-configuration>
+  home-znc-configuration make-home-znc-configuration
+  home-znc-configuration?
+  (znc           home-znc-znc           ;string
+                 (default znc))
+  (extra-options home-znc-extra-options ;list of string
+                 (default '())))
+
+(define (home-znc-services config)
+  "Return a <shepherd-service> for znc with CONFIG."
+  (match config
+    (($ <home-znc-configuration> znc extra-options)
+     (let* ((znc (file-append znc "/bin/znc"))
+            (command `(,znc
+                       "--foreground"
+                       ,@extra-options))
+            (log-file (string-append %user-log-dir "/znc.log")))
+       (list (shepherd-service
+              (documentation "Run the znc IRC bouncer.")
+              (provision '(znc))
+              (start #~(make-forkexec-constructor '#$command
+                                                  #:log-file #$log-file))
+              (stop #~(make-kill-destructor))))))))
+
+(define home-znc-service-type
+  (service-type
+   (name 'home-znc)
+   (default-value (home-znc-configuration))
+   (extensions
+    (list (service-extension home-shepherd-service-type
+                             home-znc-services)))
+   (description
+    "Install and configure @command{znc}, an @acronym{IRC, Internet Relay
+Chat} bouncer, as a Shepherd service.")))

gnu/local.mk

@@ -11,7 +11,7 @@
 # Copyright © 2016 Ben Woodcroft <donttrustben@gmail.com>
 # Copyright © 2016, 2017, 2018, 2019 Alex Vong <alexvong1995@gmail.com>
 # Copyright © 2016, 2017, 2018, 2019, 2020, 2021 Efraim Flashner <efraim@flashner.co.il>
-# Copyright © 2016, 2017, 2018, 2019, 2020, 2021, 2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 # Copyright © 2017, 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 # Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org>
 # Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
@@ -91,6 +91,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/home/services/symlink-manager.scm		\
   %D%/home/services/fontutils.scm		\
   %D%/home/services/guix.scm			\
+  %D%/home/services/messaging.scm		\
   %D%/home/services/pm.scm			\
   %D%/home/services/shells.scm			\
   %D%/home/services/shepherd.scm		\

po/guix/POTFILES.in

@@ -13,6 +13,7 @@ gnu/services/shepherd.scm
 gnu/services/samba.scm
 gnu/services/version-control.scm
 gnu/home/services.scm
+gnu/home/services/messaging.scm
 gnu/home/services/ssh.scm
 gnu/home/services/symlink-manager.scm
 gnu/system/file-systems.scm