gnu: Add piper.

* gnu/packages/gnome.scm (piper): New variable.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>

gnu/packages/gnome.scm

@@ -10054,6 +10054,68 @@ your operating-system definition:
   (simple-service 'ratbagd dbus-root-service-type (list libratbag))")
     (license license:expat)))
 
+(define-public piper
+  (package
+    (name "piper")
+    (version "0.4")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/libratbag/piper.git")
+             (commit version)))
+       (sha256
+        (base32 "17h06j8lxpbfygq8fzycl7lml4vv7r05bsyhh3gga2hp0zms4mvg"))))
+    (build-system meson-build-system)
+    (native-inputs
+     `(("gettext" ,gettext-minimal)
+       ("glib:bin" ,glib "bin")
+       ("gobject-introspection" ,gobject-introspection)
+       ("pkg-config" ,pkg-config)
+       ("python-flake8" ,python-flake8)))
+    (inputs
+     `(("adwaita-icon-theme" ,adwaita-icon-theme)
+       ("gtk" ,gtk+)
+       ("gtk:bin" ,gtk+ "bin")
+       ("librsvg" ,librsvg)
+       ("python-evdev" ,python-evdev)
+       ("python-lxml" ,python-lxml)
+       ("python-pycairo" ,python-pycairo)
+       ("python-pygobject" ,python-pygobject)))
+    (arguments
+     `(#:imported-modules ((guix build python-build-system)
+                           ,@%meson-build-system-modules)
+       #:modules (((guix build python-build-system) #:prefix python:)
+                  (guix build meson-build-system)
+                  (guix build utils))
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'dont-update-gtk-icon-cache
+           (lambda _
+             (substitute* "meson.build"
+               (("meson.add_install_script('meson_install.sh')") ""))
+             #t))
+         ;; TODO: Switch to wrap-script when it is fixed.
+         (add-after 'install 'wrap-python
+           (assoc-ref python:%standard-phases 'wrap))
+         (add-after 'wrap-python 'wrap
+           (lambda* (#:key outputs #:allow-other-keys)
+             (wrap-program
+                 (string-append (assoc-ref outputs "out" )"/bin/piper")
+               `("GI_TYPELIB_PATH" = (,(getenv "GI_TYPELIB_PATH"))))
+             #t)))))
+    (home-page "https://github.com/libratbag/piper/")
+    (synopsis "Configure bindings and LEDs on gaming mice")
+    (description "Piper is a GTK+ application for configuring gaming mice with
+onboard configuration for key bindings via libratbag.  Piper requires
+a @command{ratbagd} daemon running with root privileges.  It can be run
+manually as root, but is preferably configured as a DBus service that can
+launch on demand.  This can be configured by enabling the following service,
+provided there is a DBus service present:
+
+  (simple-service 'ratbagd dbus-root-service-type (list libratbag))")
+    (license license:gpl2)))
+
 (define-public parlatype
   ;; This is one commit away from 2.0, because the latter introduced
   ;; a regression in ASR.