efe25e3f58
# Description This makes `LabeledError` much more capable of representing close to everything a `miette::Diagnostic` can, including `ShellError`, and allows plugins to generate multiple error spans, codes, help, etc. `LabeledError` is now embeddable within `ShellError` as a transparent variant. This could also be used to improve `error make` and `try/catch` to reflect `LabeledError` exactly in the future. Also cleaned up some errors in existing plugins. # User-Facing Changes Breaking change for plugins. Nicer errors for users.
48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, PluginCommand};
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use nu_protocol::{
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Category, LabeledError, PipelineData, PluginExample, PluginSignature, SyntaxShape, Type,
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};
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use crate::Example;
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/// `<list> | example for-each { |value| ... }`
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pub struct ForEach;
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impl PluginCommand for ForEach {
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type Plugin = Example;
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fn signature(&self) -> PluginSignature {
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PluginSignature::build("example for-each")
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.usage("Example execution of a closure with a stream")
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.extra_usage("Prints each value the closure returns to stderr")
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.input_output_type(Type::ListStream, Type::Nothing)
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.required(
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"closure",
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SyntaxShape::Closure(Some(vec![SyntaxShape::Any])),
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"The closure to run for each input value",
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)
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.plugin_examples(vec![PluginExample {
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example: "ls | get name | example for-each { |f| ^file $f }".into(),
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description: "example with an external command".into(),
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result: None,
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}])
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.category(Category::Experimental)
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}
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fn run(
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&self,
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_plugin: &Example,
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engine: &EngineInterface,
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call: &EvaluatedCall,
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input: PipelineData,
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) -> Result<PipelineData, LabeledError> {
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let closure = call.req(0)?;
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let config = engine.get_config()?;
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for value in input {
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let result = engine.eval_closure(&closure, vec![value.clone()], Some(value))?;
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eprintln!("{}", result.to_expanded_string(", ", &config));
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}
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Ok(PipelineData::Empty)
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}
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}
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