nixos/fcitx5: add settings

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

@@ -6,6 +6,7 @@ let
   im = config.i18n.inputMethod;
   cfg = im.fcitx5;
   fcitx5Package = pkgs.fcitx5-with-addons.override { inherit (cfg) addons; };
+  settingsFormat = pkgs.formats.ini { };
 in
 {
   options = {
@@ -40,6 +41,44 @@ in
         '';
         description = lib.mdDoc "Quick phrase files.";
       };
+      settings = {
+        globalOptions = lib.mkOption {
+          type = lib.types.submodule {
+            freeformType = settingsFormat.type;
+          };
+          default = { };
+          description = lib.mdDoc ''
+            The global options in `config` file in ini format.
+          '';
+        };
+        inputMethod = lib.mkOption {
+          type = lib.types.submodule {
+            freeformType = settingsFormat.type;
+          };
+          default = { };
+          description = lib.mdDoc ''
+            The input method configure in `profile` file in ini format.
+          '';
+        };
+        addons = lib.mkOption {
+          type = with lib.types; (attrsOf anything);
+          default = { };
+          description = lib.mdDoc ''
+            The addon configures in `conf` folder in ini format with global sections.
+            Each item is written to the corresponding file.
+          '';
+          example = literalExpression "{ pinyin.globalSection.EmojiEnabled = \"True\"; }";
+        };
+      };
+      ignoreUserConfig = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = lib.mdDoc ''
+          Ignore the user configures. **Warning**: When this is enabled, the
+          user config files are totally ignored and the user dict can't be saved
+          and loaded.
+        '';
+      };
     };
   };
 
@@ -61,12 +100,30 @@ in
         (name: value: lib.nameValuePair ("share/fcitx5/data/quickphrase.d/${name}.mb") value)
         cfg.quickPhraseFiles))
     ];
+    environment.etc =
+      let
+        optionalFile = p: f: v: lib.optionalAttrs (v != { }) {
+          "xdg/fcitx5/${p}".text = f v;
+        };
+      in
+      lib.attrsets.mergeAttrsList [
+        (optionalFile "config" (lib.generators.toINI { }) sts.globalOptions)
+        (optionalFile "profile" (lib.generators.toINI { }) sts.inputMethod)
+        (lib.concatMapAttrs
+          (name: value: optionalFile
+            "conf/${name}.conf"
+            (lib.generators.toINIWithGlobalSection { })
+            value)
+          sts.addons)
+      ];
 
     environment.variables = {
       GTK_IM_MODULE = "fcitx";
       QT_IM_MODULE = "fcitx";
       XMODIFIERS = "@im=fcitx";
       QT_PLUGIN_PATH = [ "${fcitx5Package}/${pkgs.qt6.qtbase.qtPluginPrefix}" ];
+    } // lib.optionalAttrs cfg.ignoreUserConfig {
+      SKIP_FCITX_USER_PATH = "1";
     };
   };
 }