mirror of
https://github.com/nushell/nushell.git
synced 2025-04-24 05:08:29 +02:00
01d30a416b
# Description
This is something that was discussed in the core team meeting last
Wednesday. @ayax79 is building `nu-plugin-polars` with all of the
dataframe commands into a plugin, and there are a lot of them, so it
would help to make the API more similar. At the same time, I think the
`Command` API is just better anyway. I don't think the difference is
justified, and the types for core commands have the benefit of requiring
less `.into()` because they often don't own their data
- Broke `signature()` up into `name()`, `usage()`, `extra_usage()`,
`search_terms()`, `examples()`
- `signature()` returns `nu_protocol::Signature`
- `examples()` returns `Vec<nu_protocol::Example>`
- `PluginSignature` and `PluginExample` no longer need to be used by
plugin developers
# User-Facing Changes
Breaking API for plugins yet again 😄
107 lines
2.9 KiB
Rust
107 lines
2.9 KiB
Rust
//! Test support for [Nushell](https://nushell.sh) plugins.
|
|
//!
|
|
//! # Example
|
|
//!
|
|
//! ```rust
|
|
//! use std::sync::Arc;
|
|
//!
|
|
//! use nu_plugin::*;
|
|
//! use nu_plugin_test_support::PluginTest;
|
|
//! use nu_protocol::{
|
|
//! Example, IntoInterruptiblePipelineData, LabeledError, PipelineData, ShellError, Signature,
|
|
//! Span, Type, Value,
|
|
//! };
|
|
//!
|
|
//! struct LowercasePlugin;
|
|
//! struct Lowercase;
|
|
//!
|
|
//! impl PluginCommand for Lowercase {
|
|
//! type Plugin = LowercasePlugin;
|
|
//!
|
|
//! fn name(&self) -> &str {
|
|
//! "lowercase"
|
|
//! }
|
|
//!
|
|
//! fn usage(&self) -> &str {
|
|
//! "Convert each string in a stream to lowercase"
|
|
//! }
|
|
//!
|
|
//! fn signature(&self) -> Signature {
|
|
//! Signature::build(self.name()).input_output_type(
|
|
//! Type::List(Type::String.into()),
|
|
//! Type::List(Type::String.into()),
|
|
//! )
|
|
//! }
|
|
//!
|
|
//! fn examples(&self) -> Vec<Example> {
|
|
//! vec![Example {
|
|
//! example: r#"[Hello wORLD] | lowercase"#,
|
|
//! description: "Lowercase a list of strings",
|
|
//! result: Some(Value::test_list(vec![
|
|
//! Value::test_string("hello"),
|
|
//! Value::test_string("world"),
|
|
//! ])),
|
|
//! }]
|
|
//! }
|
|
//!
|
|
//! fn run(
|
|
//! &self,
|
|
//! _plugin: &LowercasePlugin,
|
|
//! _engine: &EngineInterface,
|
|
//! call: &EvaluatedCall,
|
|
//! input: PipelineData,
|
|
//! ) -> Result<PipelineData, LabeledError> {
|
|
//! let span = call.head;
|
|
//! Ok(input.map(
|
|
//! move |value| {
|
|
//! value
|
|
//! .as_str()
|
|
//! .map(|string| Value::string(string.to_lowercase(), span))
|
|
//! // Errors in a stream should be returned as values.
|
|
//! .unwrap_or_else(|err| Value::error(err, span))
|
|
//! },
|
|
//! None,
|
|
//! )?)
|
|
//! }
|
|
//! }
|
|
//!
|
|
//! impl Plugin for LowercasePlugin {
|
|
//! fn commands(&self) -> Vec<Box<dyn PluginCommand<Plugin=Self>>> {
|
|
//! vec![Box::new(Lowercase)]
|
|
//! }
|
|
//! }
|
|
//!
|
|
//! // #[test]
|
|
//! fn test_examples() -> Result<(), ShellError> {
|
|
//! PluginTest::new("lowercase", LowercasePlugin.into())?
|
|
//! .test_command_examples(&Lowercase)
|
|
//! }
|
|
//!
|
|
//! // #[test]
|
|
//! fn test_lowercase() -> Result<(), ShellError> {
|
|
//! let input = vec![Value::test_string("FooBar")].into_pipeline_data(None);
|
|
//! let output = PluginTest::new("lowercase", LowercasePlugin.into())?
|
|
//! .eval_with("lowercase", input)?
|
|
//! .into_value(Span::test_data());
|
|
//!
|
|
//! assert_eq!(
|
|
//! Value::test_list(vec![
|
|
//! Value::test_string("foobar")
|
|
//! ]),
|
|
//! output
|
|
//! );
|
|
//! Ok(())
|
|
//! }
|
|
//! #
|
|
//! # test_examples().unwrap();
|
|
//! # test_lowercase().unwrap();
|
|
//! ```
|
|
|
|
mod diff;
|
|
mod fake_persistent_plugin;
|
|
mod fake_register;
|
|
mod plugin_test;
|
|
mod spawn_fake_plugin;
|
|
|
|
pub use plugin_test::PluginTest;
|