{ config, pkgs, ... }: with pkgs.lib; let glibcLocales = pkgs.glibcLocales.override { allLocales = any (x: x == "all") config.i18n.supportedLocales; locales = config.i18n.supportedLocales; }; in { ###### interface options = { i18n = { defaultLocale = mkOption { default = "en_US.UTF-8"; example = "nl_NL.UTF-8"; description = " The default locale. It determines the language for program messages, the format for dates and times, sort order, and so on. It also determines the character set, such as UTF-8. "; }; supportedLocales = mkOption { default = ["all"]; example = ["en_US.UTF-8/UTF-8" "nl_NL.UTF-8/UTF-8" "nl_NL/ISO-8859-1"]; description = '' List of locales that the system should support. The value "all" means that all locales supported by Glibc will be installed. A full list of supported locales can be found at . ''; }; consoleFont = mkOption { default = "lat9w-16"; example = "LatArCyrHeb-16"; description = " The font used for the virtual consoles. Leave empty to use whatever the setfont program considers the default font. "; }; consoleKeyMap = mkOption { default = "us"; example = "fr"; description = " The keyboard mapping table for the virtual consoles. "; type = types.uniq types.string; }; }; }; ###### implementation config = { environment.systemPackages = [ glibcLocales ]; environment.variables.LANG = config.i18n.defaultLocale; # ‘/etc/locale.conf’ is used by systemd. environment.etc = singleton { target = "locale.conf"; source = pkgs.writeText "locale.conf" '' LANG=${config.i18n.defaultLocale} ''; }; }; }