Elvish

Elvish is a cross-platform shell suitable for both interactive use and scripting. It features a full-fledged, non-POSIX-shell programming language with advanced features like namespacing and anonymous functions, and a powerful, fully programmable user interface that works well out of the box.

Usage

There is an elvish module, that can be stored in $HOME/.elvish/lib/nix.elv. After that it can loaded by adding use nix in $HOME/.elvish/rc.elv.