ibus-engines.m17n: fix setup

* add setup again
* patch shebangs instead of wrapping
* format the expression

pkgs/tools/inputmethods/ibus-engines/ibus-m17n/default.nix

@@ -1,6 +1,14 @@
-{ stdenv, fetchFromGitHub
-, autoreconfHook, pkgconfig
-, ibus, m17n_lib, m17n_db, gettext, python3
+{ stdenv
+, fetchFromGitHub
+, autoreconfHook
+, pkgconfig
+, ibus
+, gtk3
+, m17n_lib
+, m17n_db
+, gettext
+, python3
+, wrapGAppsHook
 }:
 
 stdenv.mkDerivation rec {
@@ -14,14 +22,27 @@ stdenv.mkDerivation rec {
     sha256 = "1xl7swqn46nhi43rka0zx666mpk667ykag3sz07x0zqrwi41frps";
   };
 
-  buildInputs = [
-    ibus m17n_lib m17n_db gettext
-    python3
+  nativeBuildInputs = [
+    autoreconfHook
+    gettext
+    pkgconfig
+    wrapGAppsHook
   ];
 
-  nativeBuildInputs = [ autoreconfHook pkgconfig python3.pkgs.wrapPython ];
+  buildInputs = [
+    ibus
+    gtk3
+    m17n_lib
+    m17n_db
+    (python3.withPackages (ps: [
+      ps.pygobject3
+      (ps.toPythonModule ibus)
+    ]))
+  ];
 
-  postFixup = "wrapPythonPrograms";
+  configureFlags = [
+    "--with-gtk=3.0"
+  ];
 
   meta = with stdenv.lib; {
     isIbusEngine = true;