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home-manager/modules/config/i18n.nix

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# The glibc package in Nixpkgs is patched to make it possible to specify
# an alternative path for the locale archive through a special environment
# variable. This would allow different versions of glibc to coexist on the
# same system because each version of glibc could look up different paths
# for its locale archive should the archive format ever change in
# incompatible ways.
#
# See also:
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# - localedef(1)
# - https://nixos.org/manual/nixpkgs/stable/#locales
# - https://github.com/NixOS/nixpkgs/issues/38991
#
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# Note, the name of the said environment variable gets updated with each
# breaking release of the glibcLocales package. Periodically check the link
# below for changes:
# https://github.com/NixOS/nixpkgs/blob/nixpkgs-unstable/pkgs/development/libraries/glibc/nix-locale-archive.patch
{ lib, pkgs, ... }:
with lib;
let
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inherit (pkgs.glibcLocales) version;
archivePath = "${pkgs.glibcLocales}/lib/locale/locale-archive";
# lookup the version of glibcLocales and set the appropriate environment vars
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localeVars = if versionAtLeast version "2.27" then {
LOCALE_ARCHIVE_2_27 = archivePath;
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} else if versionAtLeast version "2.11" then {
LOCALE_ARCHIVE_2_11 = archivePath;
} else
{ };
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in {
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meta.maintainers = with maintainers; [ midchildan ];
config = mkIf pkgs.hostPlatform.isLinux {
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# For shell sessions.
home.sessionVariables = localeVars;
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# For desktop apps.
systemd.user.sessionVariables = localeVars;
};
}