neovim-qt: init at 0pre-2015-10-18

Unfortunately, it doesn't really seem more usable than text-mode neovim
in a good terminal.

pkgs/applications/editors/neovim-qt/default.nix

@@ -0,0 +1,48 @@
+{ stdenv, fetchFromGitHub, cmake, qt5, pythonPackages, libmsgpack
+, makeWrapper, neovim
+}:
+
+let # not very usable ATM
+  version = "0pre-2015-10-18";
+in
+stdenv.mkDerivation {
+  name = "neovim-qt-${version}";
+
+  src = fetchFromGitHub {
+    repo = "neovim-qt";
+    owner = "equalsraf";
+    rev = "03236e2";
+    sha256 = "0hhwpnj7yfqdk7yiwrq0x6n4xx30brj9clxmxx796421rlcrxypq";
+  };
+
+  # It tries to download libmsgpack; let's use ours.
+  postPatch = let use-msgpack = ''
+    cmake_minimum_required(VERSION 2.8.11)
+    project(neovim-qt-deps)
+
+    # Similar enough to FindMsgpack
+    set(MSGPACK_INCLUDE_DIRS ${libmsgpack}/include PARENT_SCOPE)
+    set(MSGPACK_LIBRARIES msgpack PARENT_SCOPE)
+  '';
+    in "echo '${use-msgpack}' > third-party/CMakeLists.txt";
+
+  buildInputs = with pythonPackages; [
+    cmake qt5.qtbase
+    python msgpack jinja2 libmsgpack
+    makeWrapper
+  ];
+
+  enableParallelBuilding = true;
+
+  installPhase = ''
+    mkdir -p "$out/bin"
+    mv ./bin/nvim-qt "$out/bin/"
+    wrapProgram "$out/bin/nvim-qt" --prefix PATH : "${neovim}/bin"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A prototype Qt5 GUI for neovim";
+    license = licenses.isc;
+    inherit (neovim.meta) platforms;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -13202,6 +13202,10 @@ let
     inherit (lua52Packages) lpeg luaMessagePack luabitop;
   };
 
+  neovim-qt = callPackage ../applications/editors/neovim-qt {
+    qt5 = qt55;
+  };
+
   virtviewer = callPackage ../applications/virtualization/virt-viewer {
     gtkvnc = gtkvnc.override { enableGTK3 = true; };
     spice_gtk = spice_gtk.override { enableGTK3 = true; };