Fcitx5
Fcitx5 is a lightweight input method framework with addon support.
Setup
The following is a simple NixOs configuration that'll setup fcitx5, its GUI config tool, and two addons.
i18n.inputMethod = { enabled = "fcitx5"; fcitx5.addons = with pkgs; [ fcitx5-mozc fcitx5-gtk ]; };
Notably, NixOs automagically sets session variables that are required for fcitx5.
Troubleshooting
Installing fcitx5 using environment.systemPackages
can interfere with addon detection.