# Plugin Once

Crate with a simple example of the Plugin trait that needs to be implemented
in order to create a binary that can be registered into nushell declaration list

## `once config`

This subcommand demonstrates sending configuration from the nushell `$env.config` to a plugin.

To make use of the plugin after building `nushell` run:

```nushell
plugin add target/debug/nu_plugin_once
# or then either restart your current nushell session or run:
plugin use target/debug/nu_plugin_once
```

The configuration for the plugin lives in `$env.config.plugins.once`:

```nushell
$env.config = {
  plugins: {
    once: [
      some
      values
    ]
  }
}
```

To list plugin values run:

```nushell
once config
```