nixos/input-methods: add fcitx5

nixos/modules/i18n/input-method/default.nix

@@ -29,7 +29,7 @@ in
   options.i18n = {
     inputMethod = {
       enabled = mkOption {
-        type    = types.nullOr (types.enum [ "ibus" "fcitx" "nabi" "uim" "hime" ]);
+        type    = types.nullOr (types.enum [ "ibus" "fcitx" "fcitx5" "nabi" "uim" "hime" ]);
         default = null;
         example = "fcitx";
         description = ''

nixos/modules/i18n/input-method/fcitx5.nix

@@ -0,0 +1,33 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  im = config.i18n.inputMethod;
+  cfg = im.fcitx5;
+  fcitx5Package = pkgs.fcitx5-with-addons.override { inherit (cfg) addons; };
+in
+  {
+    options = {
+      i18n.inputMethod.fcitx5 = {
+        addons = mkOption {
+          type = with types; listOf package;
+          default = [];
+          example = with pkgs; [ fcitx5-rime ];
+          description = ''
+            Enabled Fcitx5 addons.
+          '';
+        };
+      };
+    };
+
+    config = mkIf (im.enabled == "fcitx5") {
+      i18n.inputMethod.package = fcitx5Package;
+
+      environment.variables = {
+        GTK_IM_MODULE = "fcitx";
+        QT_IM_MODULE = "fcitx";
+        XMODIFIERS = "@im=fcitx";
+      };
+    };
+  }

nixos/modules/module-list.nix

@@ -82,6 +82,7 @@
   ./hardware/xpadneo.nix
   ./i18n/input-method/default.nix
   ./i18n/input-method/fcitx.nix
+  ./i18n/input-method/fcitx5.nix
   ./i18n/input-method/hime.nix
   ./i18n/input-method/ibus.nix
   ./i18n/input-method/nabi.nix