forked from extern/nushell
c747ec75c9
# Description
When implementing a `Command`, one must also import all the types
present in the function signatures for `Command`. This makes it so that
we often import the same set of types in each command implementation
file. E.g., something like this:
```rust
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
ShellError, Signature, Span, Type, Value,
};
```
This PR adds the `nu_engine::command_prelude` module which contains the
necessary and commonly used types to implement a `Command`:
```rust
// command_prelude.rs
pub use crate::CallExt;
pub use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, IntoSpanned,
PipelineData, Record, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
```
This should reduce the boilerplate needed to implement a command and
also gives us a place to track the breadth of the `Command` API. I tried
to be conservative with what went into the prelude modules, since it
might be hard/annoying to remove items from the prelude in the future.
Let me know if something should be included or excluded.
39 lines
1.3 KiB
Rust
39 lines
1.3 KiB
Rust
use crate::{cool_custom_value::CoolCustomValue, CustomValuePlugin};
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use nu_plugin::{EngineInterface, EvaluatedCall, SimplePluginCommand};
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use nu_protocol::{Category, LabeledError, PluginExample, PluginSignature, Span, Value};
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pub struct Generate;
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impl SimplePluginCommand for Generate {
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type Plugin = CustomValuePlugin;
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fn signature(&self) -> PluginSignature {
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PluginSignature::build("custom-value generate")
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.usage("PluginSignature for a plugin that generates a custom value")
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.category(Category::Experimental)
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.plugin_examples(vec![PluginExample {
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example: "custom-value generate".into(),
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description: "Generate a new CoolCustomValue".into(),
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result: Some(CoolCustomValue::new("abc").into_value(Span::test_data())),
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}])
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}
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fn run(
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&self,
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_plugin: &CustomValuePlugin,
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_engine: &EngineInterface,
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call: &EvaluatedCall,
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_input: &Value,
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) -> Result<Value, LabeledError> {
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Ok(CoolCustomValue::new("abc").into_value(call.head))
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}
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}
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#[test]
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fn test_examples() -> Result<(), nu_protocol::ShellError> {
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use nu_plugin_test_support::PluginTest;
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PluginTest::new("custom_values", crate::CustomValuePlugin.into())?
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.test_command_examples(&Generate)
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}
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