From 1f4ff029be789298f7732d6f2a153a234cbb5267 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Fri, 11 Mar 2022 13:49:58 +0100
Subject: ibus: ...

---
 modules/ibus.nix | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 modules/ibus.nix

diff --git a/modules/ibus.nix b/modules/ibus.nix
new file mode 100644
index 00000000..bb9b3765
--- /dev/null
+++ b/modules/ibus.nix
@@ -0,0 +1,79 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.i18n.inputMethod.ibus;
+  ibusPackage = pkgs.ibus-with-plugins.override { plugins = cfg.engines; };
+  ibusEngine = types.package // {
+    name  = "ibus-engine";
+    check = x: (lib.types.package.check x) && (attrByPath ["meta" "isIbusEngine"] false x);
+  };
+in
+{
+  disabledModules = [ "i18n/input-method/ibus.nix" ];
+
+  imports = [
+    (mkRenamedOptionModule [ "programs" "ibus" "plugins" ] [ "i18n" "inputMethod" "ibus" "engines" ])
+  ];
+
+  options = {
+    i18n.inputMethod.ibus = {
+      engines = mkOption {
+        type    = with types; listOf ibusEngine;
+        default = [];
+        example = literalExpression "with pkgs.ibus-engines; [ mozc hangul ]";
+        description =
+          let
+            enginesDrv = filterAttrs (const isDerivation) pkgs.ibus-engines;
+            engines = concatStringsSep ", "
+              (map (name: "<literal>${name}</literal>") (attrNames enginesDrv));
+          in
+            "Enabled IBus engines. Available engines are: ${engines}.";
+      };
+      panel = mkOption {
+        type = with types; nullOr path;
+        default = null;
+        example = literalExpression ''"''${pkgs.plasma5Packages.plasma-desktop}/lib/libexec/kimpanel-ibus-panel"'';
+        description = "Replace the IBus panel with another panel.";
+      };
+    };
+  };
+
+  config = mkIf (config.i18n.inputMethod.enabled == "ibus") {
+    i18n.inputMethod.package = ibusPackage;
+
+    # Without dconf enabled it is impossible to use IBus
+    programs.dconf.enable = true;
+
+    programs.dconf.packages = [ ibusPackage ];
+
+    environment.variables = {
+      GTK_IM_MODULE = "ibus";
+      QT_IM_MODULE = "ibus";
+      XMODIFIERS = "@im=ibus";
+    };
+
+    xdg.portal.extraPortals = mkIf config.xdg.portal.enable [
+      ibusPackage
+    ];
+
+    systemd.user.services.ibus = {
+      description = "Intelligent Input Bus";
+      documentation = ["man:ibus-daemon(1)"];
+      after = ["graphical-session-pre.target"];
+      wantedBy = ["graphical-session.target"];
+      
+      serviceConfig = {
+        Type = "dbus";
+        BusName = "org.freedesktop.IBus";
+        ExecStart = "${ibusPackage}/bin/ibus-daemon --xim ${optionalString (cfg.panel != null) "--panel ${cfg.panel}"}";
+        ExecReload = "${ibusPackage}/bin/ibus restart";
+        ExecStop = "${ibusPackage}/bin/ibus exit";
+      };
+    };
+  };
+
+  # uses attributes of the linked package
+  meta.buildDocsInSandbox = false;
+}
-- 
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