nushell/crates/nu-plugin/src/lib.rs

#![allow(clippy::needless_doctest_main)]
//! # Nu Plugin: Plugin library for Nushell
//!
//! This crate contains the interface necessary to build Nushell plugins in Rust.
//! Additionally, it contains public, but undocumented, items used by Nushell itself
//! to interface with Nushell plugins. This documentation focuses on the interface
//! needed to write an independent plugin.
//!
//! Nushell plugins are stand-alone applications that communicate with Nushell
//! over stdin and stdout using a standardizes serialization framework to exchange
//! the typed data that Nushell commands utilize natively.
//!
//! A typical plugin application will define a struct that implements the [Plugin]
//! trait and then, in it's main method, pass that [Plugin] to the [serve_plugin]
//! function, which will handle all of the input and output serialization when
//! invoked by Nushell.
//!
//! ```rust,no_run
//! use nu_plugin::{EvaluatedCall, LabeledError, MsgPackSerializer, Plugin, serve_plugin};
//! use nu_protocol::{PluginSignature, Value};
//!
//! struct MyPlugin;
//!
//! impl Plugin for MyPlugin {
//!     fn signature(&self) -> Vec<PluginSignature> {
//!         todo!();
//!     }
//!     fn run(
//!         &mut self,
//!         name: &str,
//!         config: &Option<Value>,
//!         call: &EvaluatedCall,
//!         input: &Value
//!     ) -> Result<Value, LabeledError> {
//!         todo!();
//!     }
//! }
//!
//! fn main() {
//!    serve_plugin(&mut MyPlugin{}, MsgPackSerializer)
//! }
//! ```
//!
//! Nushell's source tree contains a
//! [Plugin Example](https://github.com/nushell/nushell/tree/main/crates/nu_plugin_example)
//! that demonstrates the full range of plugin capabilities.
mod plugin;
mod protocol;
mod sequence;
mod serializers;

pub use plugin::{serve_plugin, Plugin, PluginEncoder, StreamingPlugin};
pub use protocol::{EvaluatedCall, LabeledError};
pub use serializers::{json::JsonSerializer, msgpack::MsgPackSerializer};

// Used by other nu crates.
#[doc(hidden)]
pub use plugin::{get_signature, PluginDeclaration};
#[doc(hidden)]
pub use serializers::EncodingType;

// Used by external benchmarks.
#[doc(hidden)]
pub use plugin::Encoder;
#[doc(hidden)]
pub use protocol::{PluginCallResponse, PluginOutput};