gnu: Add mpd service.

* doc/guix.texi: Add documentation.
* gnu/services/audio.scm (<mpd-configuration>): New record type.
  (mpd-service-type): New service type.
* gnu/tests/audio.scm: New file.
* gnu/local.mk: Add new files.

Signed-off-by: Christopher Baines <mail@cbaines.net>

1 files changed, 86 insertions, 0 deletions

diff --git a/gnu/services/audio.scm b/gnu/services/audio.scm
new file mode 100644
index 0000000000..22814a6c09
--- /dev/null
+++ b/gnu/services/audio.scm
@@ -0,0 +1,86 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Peter Mikkelsen <petermikkelsen10@gmail.com>
+;;;
+;;; 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 services audio)
+  #:use-module (guix gexp)
+  #:use-module (gnu services)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu packages mpd)
+  #:use-module (guix records)
+  #:use-module (ice-9 match)
+  #:export (mpd-configuration
+            mpd-configuration?
+            mpd-service-type))
+
+;;; Commentary:
+;;;
+;;; Audio related services
+;;;
+;;; Code:
+
+(define-record-type* <mpd-configuration>
+  mpd-configuration make-mpd-configuration
+  mpd-configuration?
+  (user         mpd-configuration-user
+                (default "mpd"))
+  (music-dir    mpd-configuration-music-dir
+                (default "~/Music"))
+  (playlist-dir mpd-configuration-playlist-dir
+                (default "~/.mpd/playlists"))
+  (port         mpd-configuration-port
+                (default "6600"))
+  (address      mpd-configuration-address
+                (default "any"))
+  (pid-file     mpd-configuration-pid-file
+                (default "/var/run/mpd.pid")))
+
+(define (mpd-config->file config)
+  (apply
+   mixed-text-file "mpd.conf"
+   "audio_output {\n"
+   "  type \"pulse\"\n"
+   "  name \"MPD\"\n"
+   "}\n"
+   (map (match-lambda
+          ((config-name config-val)
+           (string-append config-name " \"" (config-val config) "\"\n")))
+        `(("user" ,mpd-configuration-user)
+          ("music_directory" ,mpd-configuration-music-dir)
+          ("playlist_directory" ,mpd-configuration-playlist-dir)
+          ("port" ,mpd-configuration-port)
+          ("bind_to_address" ,mpd-configuration-address)
+          ("pid_file" ,mpd-configuration-pid-file)))))
+
+(define (mpd-service config)
+  (shepherd-service
+   (documentation "Run the MPD (Music Player Daemon)")
+   (provision '(mpd))
+   (start #~(make-forkexec-constructor
+             (list #$(file-append mpd "/bin/mpd")
+                   "--no-daemon"
+                   #$(mpd-config->file config))
+             #:pid-file #$(mpd-configuration-pid-file config)))
+   (stop  #~(make-kill-destructor))))
+
+(define mpd-service-type
+  (service-type
+   (name 'mpd)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             (compose list mpd-service))))
+   (default-value (mpd-configuration))))