nixpkgs/nixos/modules/config/i18n.nix

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{ config, lib, pkgs, ... }:
with lib;
{
###### interface
options = {
i18n = {
glibcLocales = mkOption {
type = types.path;
default = pkgs.glibcLocales.override {
allLocales = any (x: x == "all") config.i18n.supportedLocales;
locales = config.i18n.supportedLocales;
};
defaultText = literalExpression ''
pkgs.glibcLocales.override {
allLocales = any (x: x == "all") config.i18n.supportedLocales;
locales = config.i18n.supportedLocales;
}
'';
example = literalExpression "pkgs.glibcLocales";
description = lib.mdDoc ''
Customized pkg.glibcLocales package.
Changing this option can disable handling of i18n.defaultLocale
and supportedLocale.
'';
};
defaultLocale = mkOption {
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type = types.str;
default = "en_US.UTF-8";
example = "nl_NL.UTF-8";
description = lib.mdDoc ''
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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'';
};
extraLocaleSettings = mkOption {
type = types.attrsOf types.str;
default = {};
example = { LC_MESSAGES = "en_US.UTF-8"; LC_TIME = "de_DE.UTF-8"; };
description = lib.mdDoc ''
A set of additional system-wide locale settings other than
`LANG` which can be configured with
{option}`i18n.defaultLocale`.
'';
};
supportedLocales = mkOption {
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type = types.listOf types.str;
default = unique
(builtins.map (l: (replaceStrings [ "utf8" "utf-8" "UTF8" ] [ "UTF-8" "UTF-8" "UTF-8" ] l) + "/UTF-8") (
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[
"C.UTF-8"
"en_US.UTF-8"
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config.i18n.defaultLocale
] ++ (attrValues (filterAttrs (n: v: n != "LANGUAGE") config.i18n.extraLocaleSettings))
));
defaultText = literalExpression ''
unique
(builtins.map (l: (replaceStrings [ "utf8" "utf-8" "UTF8" ] [ "UTF-8" "UTF-8" "UTF-8" ] l) + "/UTF-8") (
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[
"C.UTF-8"
config.i18n.defaultLocale
] ++ (attrValues (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 = lib.mdDoc ''
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.
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 = 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}
${concatStringsSep "\n" (mapAttrsToList (n: v: "${n}=${v}") config.i18n.extraLocaleSettings)}
'';
};
}