ibus: add module

modules/i18n/input-method/default.nix

@@ -22,13 +22,13 @@ let
   '';
 
 in {
-  imports = [ ./fcitx5.nix ./hime.nix ./kime.nix ./nabi.nix ./uim.nix ];
+  imports = [ ./fcitx5.nix ./hime.nix ./kime.nix ./nabi.nix ./uim.nix ./ibus.nix ];
 
   options.i18n = {
     inputMethod = {
       enabled = mkOption {
         type = types.nullOr
-          (types.enum [ "fcitx" "fcitx5" "nabi" "uim" "hime" "kime" ]);
+          (types.enum [ "fcitx" "fcitx5" "nabi" "uim" "hime" "kime" "ibus" ]);
         default = null;
         example = "fcitx5";
         description = ''
@@ -58,6 +58,9 @@ in {
 
           `kime`
           : A Korean IME.
+
+          `ibus`
+          : The intelligent input bus.
         '';
       };
 

modules/i18n/input-method/ibus.nix

@@ -0,0 +1,67 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  im = config.i18n.inputMethod;
+  cfg = im.ibus;
+  impanel = optionalString (cfg.panel != null) "--panel=${cfg.panel}";
+  ibusPackage = pkgs.ibus-with-plugins.override { inherit (cfg) engines; };
+in
+{
+  options = {
+    i18n.inputMethod.ibus = {
+      engines = mkOption {
+        type = with types; listOf ibusEngine;
+        default = [ ];
+        example = literalExpression "with pkgs.ibus-engines; [ mozc hangul ]";
+        description = ''
+          Enabled IBus engines.
+        '';
+      };
+    };
+    panel = mkOption {
+      type = with types; nullOr path;
+      default = null;
+      example = literalExpression ''"''${pkgs.plasma5Packages.plasma-desktop}/libexec/kimpanel-ibus-panel"'';
+      description = ''
+        Replace the IBus panel with another panel.
+      '';
+    };
+  };
+
+  config = mkIf (im.enabled == "ibus") {
+    i18n.inputMethod.package = ibusPackage;
+
+    home.sessionVariables = {
+      GLFW_IM_MODULE = "ibus";
+      GTK_IM_MODULE = "ibus";
+      QT_IM_MODULE = "ibus";
+      XMODIFIERS = "@im=ibus";
+    };
+
+    # Without dconf enabled it is impossible to use IBus
+    programs.dconf.enable = true;
+
+    programs.dconf.packages = [ ibusPackage ];
+
+    services.dbus.packages = [ ibusPackage ];
+
+    xdg.portal.extraPortals = mkIf config.xdg.portal.enable [
+      ibusPackage
+    ];
+
+    systemd.user.services.ibus-daemon = {
+      Unit = {
+        Description = "IBus input method editor";
+        PartOf = [ "graphical-session.target" ];
+      };
+      Service = {
+        ExecStart = "${ibusPackage}/bin/ibus-daemon --replace --xim ${impanel}";
+        ExecReload = "${ibusPackage}/bin/ibus restart";
+        ExecStop = "${ibusPackage}/bin/ibus exit";
+      };
+      Install.WantedBy = [ "graphical-session.target" ];
+    };
+  };
+}