[bug#39052] [PATCH 1/3] services: Add pulseaudio-configuration.

[Leo Prikler <leo.prikler@student.tugraz.at>]

* gnu/services/sound (<pulseaudio-configuration>): New record.
(pulseaudio-etc): New procedure.
(pulseaudio-service-type): Update accordingly.
---
 gnu/services/sound.scm | 47 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/gnu/services/sound.scm b/gnu/services/sound.scm
index aaca733729..f01d958ce7 100644
--- a/gnu/services/sound.scm
+++ b/gnu/services/sound.scm
@@ -34,6 +34,7 @@
   #:export (alsa-configuration
             alsa-service-type
 
+            pulseaudio-configuration
             pulseaudio-service-type))
 
 ;;; Commentary:
@@ -106,19 +107,61 @@ ctl.!default {
 ;;; PulseAudio
 ;;;
 
+(define-record-type* <pulseaudio-configuration>
+  pulseaudio-configuration make-pulseaudio-configuration
+  pulseaudio-configuration?
+  (package pulseaudio-package (default pulseaudio))
+  (client-conf pulseaudio-client-conf (default '()))
+  (daemon-conf pulseaudio-daemon-conf (default '((flat-volumes no))))
+  (default-script pulseaudio-default-script (default #f))
+  (system-script pulseaudio-system-script (default #f)))
+
 (define (pulseaudio-environment config)
   ;; Define this variable in the global environment such that
   ;; pulseaudio swh-plugins works.
   `(("LADSPA_PATH"
      . ,(file-append swh-plugins "/lib/ladspa"))))
 
+(define (pulseaudio-conf-entry arg)
+  (match arg
+    ((key value)
+     (format #f "~a = ~s~%" key value))
+    ((? string? _)
+     (string-append arg "\n"))))
+
+(define pulseaudio-etc
+  (match-lambda
+    (($ <pulseaudio-configuration> package client-conf daemon-conf
+                                   default-script system-script)
+     (let ((default.pa (if default-script
+                           (apply mixed-text-file "default.pa"
+                                  default-script)
+                           (file-append package "/etc/pulse/default.pa"))))
+       `(("pulse"
+          ,(file-union
+            "pulse"
+            `(("client.conf"
+               ,(apply mixed-text-file "client.conf"
+                       (map pulseaudio-conf-entry client-conf)))
+              ("daemon.conf"
+               ,(apply mixed-text-file "daemon.conf"
+                       "default-script-file = " default.pa "\n"
+                       (map pulseaudio-conf-entry daemon-conf)))
+              ("default.pa" ,default.pa)
+              ("system.pa"
+               ,(if system-script
+                    (apply mixed-text-file "system.pa"
+                           system-script)
+                    (file-append package "/etc/pulse/system.pa")))))))))))
+
 (define pulseaudio-service-type
   (service-type
    (name 'pulseaudio)
    (extensions
     (list (service-extension session-environment-service-type
-                             pulseaudio-environment)))
-   (default-value #f)
+                             pulseaudio-environment)
+          (service-extension etc-service-type pulseaudio-etc)))
+   (default-value (pulseaudio-configuration))
    (description "Configure PulseAudio sound support.")))
 
 ;;; sound.scm ends here
-- 
2.24.1