openbangla-keyboard: fix IME support, remove original attribute

pkgs/applications/misc/openbangla-keyboard/default.nix

···
 , ibus
 , qtbase
 , zstd
+, withFcitx5Support ? false
+, withIbusSupport ? false
 }:
 
 stdenv.mkDerivation rec {
···
     wrapQtAppsHook
   ];
 
-  buildInputs = [
+  buildInputs = lib.optionals withFcitx5Support [
     fcitx5
+  ] ++ lib.optionals withIbusSupport [
     ibus
+  ] ++ [
     qtbase
     zstd
   ];
···
     hash = "sha256-XMleyP2h1aBhtjXhuGHyU0BN+tuL12CGoj+kLY5uye0=";
   };
 
-  cmakeFlags = [
+  cmakeFlags = lib.optionals withFcitx5Support [
     "-DENABLE_FCITX=YES"
+  ] ++ lib.optionals withIbusSupport [
     "-DENABLE_IBUS=YES"
   ];
 
···
   '';
 
   meta = {
+    isIbusEngine = withIbusSupport;
     description = "An OpenSource, Unicode compliant Bengali Input Method";
     homepage = "https://openbangla.github.io/";
     license = lib.licenses.gpl3Plus;

pkgs/top-level/aliases.nix

···
   opa = throw "opa has been removed from nixpkgs as upstream has abandoned the project"; # Added 2023-03-21
   opam_1_2 = throw "'opam_1_2' has been renamed to/replaced by 'opam'"; # Added 2023-03-08
   openafs_1_8 = openafs; # Added 2022-08-22
+  openbangla-keyboard = throw "openbangla-keyboard has been replaced by ibus-engines.openbangla-keyboard and fcitx5-openbangla-keyboard"; # added 2023-10-10
   opencascade = throw "'opencascade' has been removed as it is unmaintained; consider opencascade-occt instead'"; # Added 2023-09-18
   openconnect_head = openconnect_unstable; # Added 2022-03-29
   openconnect_gnutls = openconnect; # Added 2022-03-29

pkgs/top-level/all-packages.nix

···
       protobuf = pkgs.protobuf3_21.overrideDerivation (_: { stdenv = clangStdenv; });
     };
 
+    openbangla-keyboard = libsForQt5.callPackage ../applications/misc/openbangla-keyboard { withIbusSupport = true; };
+
     rime = callPackage ../tools/inputmethods/ibus-engines/ibus-rime { };
 
     table = callPackage ../tools/inputmethods/ibus-engines/ibus-table { };
···
   fcitx5-lua = callPackage ../tools/inputmethods/fcitx5/fcitx5-lua.nix { lua = lua5_3; };
 
   fcitx5-m17n = callPackage ../tools/inputmethods/fcitx5/fcitx5-m17n.nix { };
+
+  fcitx5-openbangla-keyboard = libsForQt5.callPackage ../applications/misc/openbangla-keyboard { withFcitx5Support = true; };
 
   fcitx5-gtk = callPackage ../tools/inputmethods/fcitx5/fcitx5-gtk.nix { };
 
···
 
   openapi-generator-cli = callPackage ../tools/networking/openapi-generator-cli { jre = pkgs.jre_headless; };
   openapi-generator-cli-unstable = callPackage ../tools/networking/openapi-generator-cli/unstable.nix { jre = pkgs.jre_headless; };
-
-  openbangla-keyboard = libsForQt5.callPackage ../applications/misc/openbangla-keyboard { };
 
   openboard = libsForQt5.callPackage ../applications/graphics/openboard { };