nixpkgs/nixos/modules/config/i18n.nix

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{ config, lib, pkgs, ... }:
with lib;
let
glibcLocales = pkgs.glibcLocales.override {
allLocales = any (x: x == "all") config.i18n.supportedLocales;
locales = config.i18n.supportedLocales;
};
in
{
###### interface
options = {
i18n = {
defaultLocale = mkOption {
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type = types.str;
default = "en_US.UTF-8";
example = "nl_NL.UTF-8";
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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.
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'';
};
supportedLocales = mkOption {
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type = types.listOf types.str;
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
<literal>"all"</literal> means that all locales supported by
Glibc will be installed. A full list of supported locales
can be found at <link
xlink:href="http://sourceware.org/cgi-bin/cvsweb.cgi/libc/localedata/SUPPORTED?cvsroot=glibc"/>.
'';
};
consoleFont = mkOption {
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type = types.str;
default = "lat9w-16";
example = "LatArCyrHeb-16";
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description = ''
The font used for the virtual consoles. Leave empty to use
whatever the <command>setfont</command> program considers the
default font.
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'';
};
consoleKeyMap = mkOption {
type = mkOptionType {
name = "string or path";
check = t: (isString t || types.path.check t);
};
default = "us";
example = "fr";
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description = ''
The keyboard mapping table for the virtual consoles.
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'';
};
};
};
###### implementation
config = {
environment.systemPackages =
optional (config.i18n.supportedLocales != []) glibcLocales;
environment.sessionVariables =
{ LANG = config.i18n.defaultLocale;
LOCALE_ARCHIVE = "/run/current-system/sw/lib/locale/locale-archive";
};
systemd.globalEnvironment = mkIf (config.i18n.supportedLocales != []) {
LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive";
};
# /etc/locale.conf is used by systemd.
environment.etc = singleton
{ target = "locale.conf";
source = pkgs.writeText "locale.conf"
''
LANG=${config.i18n.defaultLocale}
'';
};
};
}