gnu: Add volctl.

* gnu/packages/gtk.scm (volctl): New Variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/gtk.scm

@@ -26,6 +26,7 @@
 ;;; Copyright © 2020 Guillaume Le Vaillant <glv@posteo.net>
 ;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2021 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2021 Simon Streit <simon@netpanic.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -90,6 +91,7 @@ (define-module (gnu packages gtk)
   #:use-module (gnu packages xml)
   #:use-module (gnu packages xorg)
   #:use-module (gnu packages xdisorg)
+  #:use-module (gnu packages pulseaudio)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
   #:use-module (ice-9 match))
@@ -2354,3 +2356,47 @@ (define-public gtkdatabox
 user interaction (e.g.  measuring distances).")
     (home-page "https://sourceforge.net/projects/gtkdatabox/")
     (license license:lgpl2.1+)))
+
+(define-public volctl
+  (package
+    (name "volctl")
+    (version "0.8.2")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference (url "https://github.com/buzz/volctl")
+                                  (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1cx27j83pz2qffnzb85fbl1x6pp3irv1kbw7g1hri7kaw6ky4xiz"))))
+    (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'patch-path
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let ((pulse (assoc-ref inputs "pulseaudio"))
+                   (xfixes (assoc-ref inputs "libxfixes")))
+               (substitute* "volctl/lib/xwrappers.py"
+                 (("libXfixes.so")
+                  (string-append xfixes "/lib/libXfixes.so")))
+               (substitute* "volctl/lib/pulseaudio.py"
+                 (("libpulse.so.0")
+                  (string-append pulse "/lib/libpulse.so.0")))
+               #t))))))
+    (inputs
+     `(("gtk+" ,gtk+)
+       ("libxfixes" ,libxfixes)
+       ("pulseaudio" ,pulseaudio)))
+    (propagated-inputs
+     `(("python-click" ,python-click)
+       ("python-pycairo" ,python-pycairo)
+       ("python-pygobject" ,python-pygobject)
+       ("python-pyyaml" ,python-pyyaml)))
+    (home-page "https://buzz.github.io/volctl/")
+    (synopsis "Per-application volume control and on-screen display (OSD) for graphical desktops")
+    (description "Volctl is a PulseAudio-enabled tray icon volume control and
+OSD applet for graphical desktops.  It's not meant to be an replacement for a
+full-featured mixer application.  If you're looking for that check out the
+excellent pavucontrol.")
+    (license license:gpl2)))