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# Description
The meaning of the word usage is specific to describing how a command
function is *used* and not a synonym for general description. Usage can
be used to describe the SYNOPSIS or EXAMPLES sections of a man page
where the permitted argument combinations are shown or example *uses*
are given.
Let's not confuse people and call it what it is a description.
Our `help` command already creates its own *Usage* section based on the
available arguments and doesn't refer to the description with usage.
# User-Facing Changes
`help commands` and `scope commands` will now use `description` or
`extra_description`
`usage`-> `description`
`extra_usage` -> `extra_description`
Breaking change in the plugin protocol:
In the signature record communicated with the engine.
`usage`-> `description`
`extra_usage` -> `extra_description`
The same rename also takes place for the methods on
`SimplePluginCommand` and `PluginCommand`
# Tests + Formatting
- Updated plugin protocol specific changes
# After Submitting
- [ ] update plugin protocol doc
91 lines
2.4 KiB
Rust
91 lines
2.4 KiB
Rust
use nu_plugin::*;
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use nu_plugin_test_support::PluginTest;
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use nu_protocol::{
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Example, IntoInterruptiblePipelineData, LabeledError, PipelineData, ShellError, Signals,
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Signature, Span, Type, Value,
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};
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struct LowercasePlugin;
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struct Lowercase;
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impl PluginCommand for Lowercase {
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type Plugin = LowercasePlugin;
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fn name(&self) -> &str {
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"lowercase"
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}
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fn description(&self) -> &str {
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"Convert each string in a stream to lowercase"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name()).input_output_type(
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Type::List(Type::String.into()),
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Type::List(Type::String.into()),
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)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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example: r#"[Hello wORLD] | lowercase"#,
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description: "Lowercase a list of strings",
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result: Some(Value::test_list(vec![
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Value::test_string("hello"),
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Value::test_string("world"),
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])),
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}]
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}
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fn run(
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&self,
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_plugin: &LowercasePlugin,
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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 span = call.head;
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Ok(input.map(
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move |value| {
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value
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.as_str()
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.map(|string| Value::string(string.to_lowercase(), span))
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// Errors in a stream should be returned as values.
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.unwrap_or_else(|err| Value::error(err, span))
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},
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&Signals::empty(),
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)?)
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}
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}
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impl Plugin for LowercasePlugin {
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fn version(&self) -> String {
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"0.0.0".into()
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}
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fn commands(&self) -> Vec<Box<dyn PluginCommand<Plugin = Self>>> {
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vec![Box::new(Lowercase)]
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}
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}
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#[test]
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fn test_lowercase_using_eval_with() -> Result<(), ShellError> {
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let result = PluginTest::new("lowercase", LowercasePlugin.into())?.eval_with(
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"lowercase",
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vec![Value::test_string("HeLlO wOrLd")]
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.into_pipeline_data(Span::test_data(), Signals::empty()),
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)?;
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assert_eq!(
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Value::test_list(vec![Value::test_string("hello world")]),
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result.into_value(Span::test_data())?
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);
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Ok(())
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}
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#[test]
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fn test_lowercase_examples() -> Result<(), ShellError> {
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PluginTest::new("lowercase", LowercasePlugin.into())?.test_command_examples(&Lowercase)
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}
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