i18n.inputMethod: add module

tests/default.nix

@@ -88,6 +88,7 @@ import nmt {
     ./modules/targets-darwin
   ] ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [
     ./modules/config/i18n
+    ./modules/i18n/input-method
     ./modules/misc/debug
     ./modules/misc/gtk
     ./modules/misc/numlock

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

@@ -0,0 +1 @@
+{ input-method-fcitx5-configuration = ./fcitx5-configuration.nix; }

tests/modules/i18n/input-method/fcitx5-configuration.nix

@@ -0,0 +1,15 @@
+{ config, pkgs, ... }:
+
+{
+  config = {
+    nixpkgs.overlays = [ (import ./fcitx5-overlay.nix) ];
+    i18n.inputMethod = {
+      enabled = "fcitx5";
+      fcitx5.addons = with pkgs; [ fcitx5-chinese-addons ];
+    };
+
+    nmt.script = ''
+      assertFileExists home-files/.config/systemd/user/fcitx5-daemon.service
+    '';
+  };
+}

tests/modules/i18n/input-method/fcitx5-overlay.nix

@@ -0,0 +1,22 @@
+final: prev:
+
+let
+
+  dummy = prev.runCommandLocal "dummy-package" { } "mkdir $out";
+
+in {
+  fcitx5 = prev.runCommandLocal "fcitx5" { version = "0"; } ''
+    mkdir -p $out/bin $out/share/applications $out/etc/xdg/autostart
+    touch $out/bin/fcitx5 \
+          $out/share/applications/org.fcitx.Fcitx5.desktop \
+          $out/etc/xdg/autostart/org.fcitx.Fcitx5.desktop
+    chmod +x $out/bin/fcitx5
+  '';
+  fcitx5-configtool = dummy;
+  fcitx5-lua = dummy;
+  fcitx5-qt = dummy;
+  fcitx5-gtk = dummy;
+  fcitx5-with-addons =
+    prev.fcitx5-with-addons.override { inherit (final) fcitx5-qt; };
+  fcitx5-chinese-addons = dummy;
+}