wrapper-manager-fds/modules: add locale option for global env and per-wrapper

modules/env/home-manager/default.nix

@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, lib, ... }@moduleArgs:
 
 let
   cfg = config.wrapper-manager;
@@ -11,6 +11,16 @@ in
   config = lib.mkMerge [
     { wrapper-manager.extraSpecialArgs.hmConfig = config; }
 
+    (lib.mkIf moduleArgs?nixosConfig {
+      wrapper-manager.sharedModules = [
+        ({ lib, ... }: {
+          # NixOS already has the option to set the locale so we don't need to
+          # have this.
+          config.locale.enable = lib.mkDefault false;
+        })
+      ];
+    })
+
     (lib.mkIf (cfg.packages != {}) {
       home.packages =
         lib.mapAttrsToList (_: wrapper: wrapper.build.toplevel) cfg.packages;

modules/env/nixos/default.nix

@@ -9,7 +9,17 @@ in
   ];
 
   config = lib.mkMerge [
-    { wrapper-manager.extraSpecialArgs.nixosConfig = config; }
+    {
+      wrapper-manager.extraSpecialArgs.nixosConfig = config;
+
+      wrapper-manager.sharedModules = [
+        ({ lib, ... }: {
+          # NixOS already has the option to set the locale so we don't need to
+          # have this.
+          config.locale.enable = lib.mkDefault false;
+        })
+      ];
+    }
 
     (lib.mkIf (cfg.packages != {}) {
       environment.systemPackages =

modules/wrapper-manager/default.nix

@@ -3,6 +3,7 @@
     ./base.nix
     ./xdg-desktop-entries.nix
     ./xdg-dirs.nix
+    ./locale.nix
     ./build.nix
     ./extra-args.nix
   ];

modules/wrapper-manager/locale.nix

@@ -0,0 +1,51 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.locale;
+
+  localeModuleFactory = { isGlobal ? false }: {
+    locale = {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = if isGlobal then true else cfg.enable;
+        description = if isGlobal then ''
+          Whether to enable explicit glibc locale support. This is recommended
+          for Nix-built applications.
+        '' else ''
+          Whether to enable locale support for this wrapper. Recommended for
+          Nix-built applications.
+        '';
+      };
+
+      package = lib.mkOption {
+        type = lib.types.package;
+        default =
+          if isGlobal
+          then (pkgs.glibcLocales.override { allLocales = true; })
+          else cfg.package;
+        description = ''
+          The package containing glibc locales.
+        '';
+      };
+    };
+  };
+in
+{
+  options.locale = localeModuleFactory { isGlobal = true; };
+
+  options.wrappers =
+    let
+      localeSubmodule = { config, lib, name, ... }: let
+        submoduleCfg = config.locale;
+      in {
+        options.locale = localeModuleFactory { isGlobal = false; };
+
+        config = lib.mkIf submoduleCfg.enable {
+          env.LOCALE_ARCHIVE = "${submoduleCfg.package}/lib/locale/locale-archive";
+        };
+      };
+    in
+      lib.mkOption {
+        type = with lib.types; attrsOf (submodule localeSubmodule);
+      };
+}