# [Rhai](https://schungx.github.io/rhai/) Scripting

`Rhai` provides a way to automate things. A script listens to messages in the system and reacts by emitting another messages and/or by calling service methods.

Take also a look at the [Cookbook](../cookbook.md) for examples.

## Callback `on_message`

## Additional Global Functions

### `spawn_process(program, args)`

### `error(message)` and `warning(message)`

## Additional String Functions

### `starts_with(another)`