config: command-line revamp

modules/linux/shell/default.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }: let
+  inherit (lib) concatStringsSep const flatten getAttr mapAttrsToList mkForce unique;
+in {
+  users.defaultUserShell = pkgs.zsh;
+
+  environment.sessionVariables.SHELLS = config.home-manager.users
+  |> mapAttrsToList (const <| getAttr "shellsByPriority")
+  |> flatten
+  |> map (drv: "${drv}${drv.shellPath}")
+  |> unique
+  |> concatStringsSep ":";
+
+  environment.shellAliases = {
+    ls = mkForce null;
+    l  = mkForce null;
+  };
+}