neovim: adding python gui option

- pythonPackages.neovim_gui init

pkgs/applications/editors/neovim/default.nix

@@ -6,6 +6,7 @@
 , withPython3 ? true, python3Packages, extraPython3Packages ? []
 , withJemalloc ? true, jemalloc
 
+, withPyGUI ? false
 , vimAlias ? false
 , configure ? null
 }:
@@ -45,7 +46,11 @@ let
   };
 
   pythonEnv = pythonPackages.python.buildEnv.override {
-    extraLibs = [ pythonPackages.neovim ] ++ extraPythonPackages;
+    extraLibs = (
+        if withPyGUI
+          then [ pythonPackages.neovim_gui ]
+          else [ pythonPackages.neovim ]
+      ) ++ extraPythonPackages;
     ignoreCollisions = true;
   };
 
@@ -103,6 +108,8 @@ let
                 $out/bin/nvim
     '' + optionalString withPython ''
       ln -s ${pythonEnv}/bin/python $out/bin/nvim-python
+    '' + optionalString withPyGUI ''
+      ln -s ${pythonEnv}/bin/pynvim $out/bin/pynvim
     '' + optionalString withPython3 ''
       ln -s ${python3Env}/bin/python3 $out/bin/nvim-python3
     '' + optionalString (withPython || withPython3) ''

pkgs/top-level/python-packages.nix

@@ -20456,6 +20456,34 @@ let
     };
   };
 
+  neovim_gui = buildPythonPackage rec {
+    name = "neovim-gui-${self.neovim.version}";
+    disabled = !isPy27;
+
+    src = self.neovim.src;
+
+    propagatedBuildInputs = [
+      self.msgpack
+      self.greenlet
+      self.trollius
+      self.click
+      self.pygobject3
+      pkgs.gobjectIntrospection
+      pkgs.makeWrapper
+      pkgs.gtk3
+    ];
+
+    patchPhase = ''
+      sed -i -e "s|entry_points=entry_points,|entry_points=dict(console_scripts=['pynvim=neovim.ui.cli:main [GUI]']),|" setup.py
+    '';
+
+    postInstall = ''
+      wrapProgram $out/bin/pynvim \
+        --prefix GI_TYPELIB_PATH : "$GI_TYPELIB_PATH" \
+        --prefix PYTHONPATH : "${self.pygobject3}/lib/python2.7/site-packages:$PYTHONPATH"
+    '';
+  };
+
   ghp-import = buildPythonPackage rec {
     version = "0.4.1";
     name = "ghp-import-${version}";