Move all files

modules/system/keymaps/default.nix

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+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.keymaps;
+in
+{
+  options.modules.system.keymaps = {
+    layout = mkOption {
+      default = "fr";
+      example = "fr";
+      description = ''
+        Set key layout (fr, us)
+      '';
+      type = types.string;
+    };
+  };
+  config = {
+    imports = [
+      ./${cfg.layout}
+    ];
+  };
+}

modules/system/keymaps/fr.nix

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+{ config, pkgs, ... }:
+{
+  # Configure keymap in X11
+  services.xserver = {
+    xkb = {
+      layout = "fr";
+      variant = "";
+    };
+  };
+
+  # Configure console keymap
+  console.keyMap = "fr";
+}

modules/system/keymaps/us.nix

@@ -0,0 +1,13 @@
+{ config, pkgs, ... }:
+{
+  # Configure keymap in X11
+  services.xserver = {
+    xkb = {
+      layout = "us";
+      variant = "altgr-intl";
+    };
+  };
+
+  # Configure console keymap
+  console.keyMap = "us";
+}