[bug#67120] [PATCH v6 5/5] gnu: Add home-jellyfin-mpv-shim-service-type.

[Ian Eure <ian@retrospec.tv>]

* gnu/home/services/media.scm (home-jellyfin-mpv-shim-service-type): New variable.
* doc/guix.texi (Jellyfin Services): New section.
* doc/guix.texi (Kodi Services): Add subheading.

Change-Id: I037ab0602214fdaa1b032be51ff98ecf6b7ee16c
---
 doc/guix.texi               | 19 +++++++++++++++++
 gnu/home/services/media.scm | 42 +++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 671cdab6f8..f4d64f9df7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -46103,6 +46103,8 @@ Media Home Services
 @subsection Media Home Services
 
 @cindex kodi
+@subsubheading Kodi Services
+
 The @uref{https://kodi.tv, Kodi media center} can be run as a daemon on
 a media server.  With the @code{(gnu home services kodi)} service, you
 can configure Kodi to run upon login.
@@ -46135,6 +46137,23 @@ Media Home Services
 @end table
 @end deftp
 
+@cindex jellyfin
+@subsubheading Jellyfin Services
+
+The @code{home-jellyfin-mpv-shim-service-type} in the @code{(gnu home services media)} module runs a cast client for the @uref{https://jellyfin.org/, Jellyfin} media system.
+
+To enable, add this to your home services:
+
+@lisp
+(service home-jellyfin-mpv-shim-service-type #f)
+@end lisp
+
+The service only starts if @code{jellyfin-mpv-shim} has been configured with a remote server and credentials.  This must be done manually, by launching @code{jellyfin-mpv-shim}.  After configuring the server, the service will start automatically when you log in.
+
+@defvar home-jellyfin-mpv-shim-service-type
+The type of the Jellyfin MPV Shim service.
+@end defvar
+
 @node Networking Home Services
 @subsection Networking Home Services
 
diff --git a/gnu/home/services/media.scm b/gnu/home/services/media.scm
index c6454dfe15..a7fcf75b06 100644
--- a/gnu/home/services/media.scm
+++ b/gnu/home/services/media.scm
@@ -19,8 +19,10 @@
 (define-module (gnu home services media)
   #:use-module (srfi srfi-26)
   #:use-module (gnu home services)
+  #:use-module (gnu home services desktop)
   #:use-module (gnu home services shepherd)
   #:use-module (gnu packages kodi)
+  #:use-module (gnu packages video)
   #:use-module (gnu services configuration)
   #:use-module (gnu services shepherd)
   #:use-module (guix records)
@@ -66,3 +68,43 @@ (define home-kodi-service-type
    (description
     "Install and configure the Kodi media center so that it runs as a Shepherd
 service.")))
+
+(define (jellyfin-mpv-shim-shepherd-service _ignore)
+  (list (shepherd-service
+         (documentation "Jellyfin MPV Shim.")
+         (provision '(jellyfin-mpv-shim jellyfin-client))
+
+         ;; Depend on 'x11-display', which sets 'DISPLAY' if an X11 server is
+         ;; available, and fails to start otherwise.
+         (requirement '(x11-display))
+
+         (modules '((srfi srfi-1)
+                    (srfi srfi-26)
+                    (srfi srfi-98)))
+         (start #~(lambda _
+                    ;; Only start if a server has been configured.
+                    (if (file-exists?
+                         (string-append
+                          (get-environment-variable "XDG_CONFIG_HOME")
+                          "/jellyfin-mpv-shim/cred.json"))
+                        (fork+exec-command
+                         (list #$(file-append jellyfin-mpv-shim "/bin/jellyfin-mpv-shim"))
+
+                         ;; Inherit the 'DISPLAY' variable set by 'x11-display'.
+                         #:environment-variables
+                         (cons (string-append "DISPLAY=" (getenv "DISPLAY"))
+                               (remove (cut string-prefix? "DISPLAY=" <>)
+                                       (default-environment-variables))))
+                        #f)))
+         (stop #~(make-kill-destructor)))))
+
+(define-public home-jellyfin-mpv-shim-service-type
+  (service-type
+   (name 'home-jellyfin-mpv-shim)
+   (extensions (list (service-extension home-shepherd-service-type
+                                        jellyfin-mpv-shim-shepherd-service)
+                     ;; Ensure 'home-x11-service-type' is instantiated so we
+                     ;; can depend on the Shepherd 'x11-display' service.
+                     (service-extension home-x11-service-type
+                                        (const #t))))
+   (description "Run Jellyfin MPV Shim.")))
-- 
2.41.0