#+title: Locale
#+setupfile: ../headers

* Locale
I want my system messages in English, but everything else about how
dates, money and paper sizes are formatted to reflect where I actually
live. Here’s the =nixos.locale= module.
#+begin_src nix :tangle yes
{
  flake.modules.nixos.locale = {
    i18n = {
      <<default-locale>>
      <<extra-locale-settings>>
    };
  };
}
#+end_src

** Default Locale
=en_DK.UTF-8= is a well-known trick: English messages and collation, but
ISO 8601 dates and sane metric units, instead of =en_US='s nonsense
MM/DD/YYYY and imperial units.
#+name: default-locale
#+begin_src nix
defaultLocale = "en_DK.UTF-8";
#+end_src

** Regional Settings
Since I live in France, I want addresses, money, paper size, phone
numbers and the like to follow French conventions instead of whatever
=en_DK= would otherwise pick.
#+name: extra-locale-settings
#+begin_src nix
extraLocaleSettings = {
  LC_ADDRESS = "fr_FR.UTF-8";
  LC_IDENTIFICATION = "fr_FR.UTF-8";
  LC_MEASUREMENT = "fr_FR.UTF-8";
  LC_MONETARY = "fr_FR.UTF-8";
  LC_NAME = "fr_FR.UTF-8";
  LC_NUMERIC = "fr_FR.UTF-8";
  LC_PAPER = "fr_FR.UTF-8";
  LC_TELEPHONE = "fr_FR.UTF-8";
  LC_TIME = "fr_FR.UTF-8";
};
#+end_src