nixpkgs/nixos/modules/config/i18n.nix
2024-09-04 12:21:09 -04:00

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{ config, lib, pkgs, ... }:
{
###### interface
options = {
i18n = {
glibcLocales = lib.mkOption {
type = lib.types.path;
default = pkgs.glibcLocales.override {
allLocales = lib.any (x: x == "all") config.i18n.supportedLocales;
locales = config.i18n.supportedLocales;
};
defaultText = lib.literalExpression ''
pkgs.glibcLocales.override {
allLocales = lib.any (x: x == "all") config.i18n.supportedLocales;
locales = config.i18n.supportedLocales;
}
'';
example = lib.literalExpression "pkgs.glibcLocales";
description = ''
Customized pkg.glibcLocales package.
Changing this option can disable handling of i18n.defaultLocale
and supportedLocale.
'';
};
defaultLocale = lib.mkOption {
type = lib.types.str;
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.
'';
};
extraLocaleSettings = lib.mkOption {
type = lib.types.attrsOf lib.types.str;
default = {};
example = { LC_MESSAGES = "en_US.UTF-8"; LC_TIME = "de_DE.UTF-8"; };
description = ''
A set of additional system-wide locale settings other than
`LANG` which can be configured with
{option}`i18n.defaultLocale`.
'';
};
supportedLocales = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = lib.unique
(builtins.map (l: (lib.replaceStrings [ "utf8" "utf-8" "UTF8" ] [ "UTF-8" "UTF-8" "UTF-8" ] l) + "/UTF-8") (
[
"C.UTF-8"
"en_US.UTF-8"
config.i18n.defaultLocale
] ++ (lib.attrValues (lib.filterAttrs (n: v: n != "LANGUAGE") config.i18n.extraLocaleSettings))
));
defaultText = lib.literalExpression ''
lib.unique
(builtins.map (l: (lib.replaceStrings [ "utf8" "utf-8" "UTF8" ] [ "UTF-8" "UTF-8" "UTF-8" ] l) + "/UTF-8") (
[
"C.UTF-8"
"en_US.UTF-8"
config.i18n.defaultLocale
] ++ (lib.attrValues (lib.filterAttrs (n: v: n != "LANGUAGE") config.i18n.extraLocaleSettings))
))
'';
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 <https://sourceware.org/git/?p=glibc.git;a=blob;f=localedata/SUPPORTED>.
'';
};
};
};
###### implementation
config = {
environment.systemPackages =
# We increase the priority a little, so that plain glibc in systemPackages can't win.
lib.optional (config.i18n.supportedLocales != []) (lib.setPrio (-1) config.i18n.glibcLocales);
environment.sessionVariables =
{ LANG = config.i18n.defaultLocale;
LOCALE_ARCHIVE = "/run/current-system/sw/lib/locale/locale-archive";
} // config.i18n.extraLocaleSettings;
systemd.globalEnvironment = lib.mkIf (config.i18n.supportedLocales != []) {
LOCALE_ARCHIVE = "${config.i18n.glibcLocales}/lib/locale/locale-archive";
};
# /etc/locale.conf is used by systemd.
environment.etc."locale.conf".source = pkgs.writeText "locale.conf"
''
LANG=${config.i18n.defaultLocale}
${lib.concatStringsSep "\n" (lib.mapAttrsToList (n: v: "${n}=${v}") config.i18n.extraLocaleSettings)}
'';
};
}