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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
56 lines
1.4 KiB
Rust
56 lines
1.4 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, PluginCommand};
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use nu_protocol::{Category, Example, LabeledError, PipelineData, Signature, Type, Value};
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use crate::ExamplePlugin;
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/// `<list> | example echo`
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pub struct Echo;
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impl PluginCommand for Echo {
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type Plugin = ExamplePlugin;
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fn name(&self) -> &str {
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"example echo"
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}
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fn description(&self) -> &str {
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"Example stream consumer that outputs the received input"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.input_output_types(vec![(Type::Any, Type::Any)])
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.category(Category::Experimental)
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["example"]
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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example: "example seq 1 5 | example echo",
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description: "echos the values from 1 to 5",
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result: Some(Value::test_list(
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(1..=5).map(Value::test_int).collect::<Vec<_>>(),
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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: &ExamplePlugin,
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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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Ok(input)
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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("example", ExamplePlugin.into())?.test_command_examples(&Echo)
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}
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