# rush
RUst SHell: a posixy shell implemented in Rust with minimal external dependencies.

Q: Why another shell in Rust?

A: Existing shell projects (a) aim to be 'a better shell', and (b) have a lot of dependencies, so they cannot be easily ported to non-standard OSes; and even non-standard OSes often need interactive shells.

## Goals

- A simple interactive shell with a familiar subset of standard shell functionality;
- Minimal external dependencies and thus easily portable;
- To eventually comply, as much as posible, with the [spec](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/contents.html).

## Non-goals

- To be better than X (sh, bash, etc). The main purpose of this project is simplicity and portability.

## How to use

- Just do a 'cargo run';
- Try various commands;
- File bug reports;
- Type 'exit' or 'quit'.

## What works

- Basic line editing (arrows, home/end, del/backspace, basic history);
- Command piping (e.g. 'ls | wc -l');
- Globbing (e.g. "ls src/\*.rs") (using glob crate).

## TODO

- Non-interactive mode (batch processing);
- Variables, environment, loops, eval, etc.

## Contributions:

- Are welcome;
- If you plan to add a large feature or make a non-trivial refactoring, please discuss your approach first.