Package for the Polari IRC app

This commit includes a patch to telepathy's derivation, written by
Lethalman. This patch makes public the Telepathy's dependency to
dbus_glib. This patch will become problematic with the next pkgconfig
upgrade but this upgrade should make the patch irrelevant. See these 2
links for more information:
- https://bugs.freedesktop.org/show_bug.cgi?id=15199
- https://bugzilla.redhat.com/show_bug.cgi?id=436773

Modified by Luca Bruno:
- Moved telepathy_idle to propagatedUserEnvPkgs
- Added myself to maintainers
- Enable parallel building

pkgs/desktops/gnome-3/3.12/apps/polari/default.nix

@@ -0,0 +1,27 @@
+{stdenv, fetchurl, makeWrapper, intltool, pkgconfig, gobjectIntrospection, glib, gtk3, telepathy_glib, gnome3, telepathy_idle }:
+
+stdenv.mkDerivation rec {
+  version = "3.12.2";
+  name = "polari-${version}";
+  src = fetchurl {
+    url = "https://download.gnome.org/sources/polari/3.12/polari-${version}.tar.xz";
+    sha256 = "8b10f369fac9e5e48a7bed51320754262d00c1bb14899a321b02843e20c0a995";
+  };
+  buildInputs = [ makeWrapper intltool pkgconfig gobjectIntrospection glib gtk3 telepathy_glib gnome3.gjs ];
+  propagatedUserEnvPkgs = [ telepathy_idle ];
+
+  preFixup = ''
+    wrapProgram "$out/bin/polari" \
+      --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH" \
+      --prefix XDG_DATA_DIRS : "${gnome3.gnome_themes_standard}/share:$XDG_ICON_DIRS:$GSETTINGS_SCHEMAS_PATH" 
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with stdenv.lib; {
+    description = "Internet Relay Chat (IRC) client designed for GNOME 3";
+    homepage = https://wiki.gnome.org/Apps/Polari;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.lethalman ];
+  };
+}

pkgs/desktops/gnome-3/3.12/default.nix

@@ -234,6 +234,8 @@ rec {
 
   seahorse = callPackage ./apps/seahorse { };
 
+  polari = callPackage ./apps/polari { };
+
   pomodoro = callPackage ./apps/pomodoro { };
 
 #### Dev http://ftp.gnome.org/pub/GNOME/devtools/