gnome-power-manager: init at 3.26.0

Provides an app to view battery and power statistics.  This app is badly
documented on the web, but is in the default Fedora install; hence to
motivation to add it to Nix.

pkgs/desktops/gnome-3/apps/gnome-power-manager/default.nix

@@ -0,0 +1,47 @@
+{ stdenv
+, intltool
+, fetchurl
+, pkgconfig
+, gtk3
+, glib
+, meson
+, ninja
+, upower
+, desktop_file_utils
+, wrapGAppsHook
+, gnome3 }:
+
+stdenv.mkDerivation rec {
+  inherit (import ./src.nix fetchurl) name src;
+
+  propagatedUserEnvPkgs = [ gnome3.gnome_themes_standard ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkgconfig
+    wrapGAppsHook
+    intltool
+
+    # needed by meson_post_install.sh
+    glib.dev
+    desktop_file_utils
+  ];
+
+  buildInputs = [
+    gtk3
+    glib
+    upower
+    gnome3.defaultIconTheme
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    homepage = https://projects.gnome.org/gnome-power-manager/;
+    description = "View battery and power statistics provided by UPower";
+    maintainers = gnome3.maintainers;
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+  };
+}

pkgs/desktops/gnome-3/apps/gnome-power-manager/src.nix

@@ -0,0 +1,10 @@
+# Autogenerated by maintainers/scripts/gnome.sh update
+
+fetchurl: {
+  name = "gnome-power-manager-3.26.0";
+
+  src = fetchurl {
+    url = mirror://gnome/sources/gnome-power-manager/3.26/gnome-power-manager-3.26.0.tar.xz;
+    sha256 = "20aee0b0b4015e7cc6fbabc3cbc4344c07c230fe3d195e90c8ae0dc5d55a2d4e";
+  };
+}

pkgs/desktops/gnome-3/default.nix

@@ -36,6 +36,7 @@ let
     nautilus-sendto dconf-editor vinagre gnome-weather gnome-logs
     gnome-maps gnome-characters gnome-calendar accerciser gnome-nettool
     gnome-getting-started-docs gnome-packagekit gnome-software
+    gnome-power-manager
   ];
 
   gamesPackages = with gnome3; [ swell-foop lightsoff iagno
@@ -297,6 +298,8 @@ let
     gegl = gegl_0_3;
   };
 
+  gnome-power-manager = callPackage ./apps/gnome-power-manager { };
+
   gnome-weather = callPackage ./apps/gnome-weather { };
 
   nautilus-sendto = callPackage ./apps/nautilus-sendto { };