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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
62 lines
1.8 KiB
Rust
62 lines
1.8 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, SimplePluginCommand};
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use nu_protocol::{LabeledError, ShellError, Signature, Type, Value};
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use crate::{handle_custom_value::HandleCustomValue, CustomValuePlugin};
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pub struct HandleGet;
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impl SimplePluginCommand for HandleGet {
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type Plugin = CustomValuePlugin;
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fn name(&self) -> &str {
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"custom-value handle get"
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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_type(Type::Custom("HandleCustomValue".into()), Type::Any)
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}
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fn description(&self) -> &str {
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"Get a value previously stored in a handle"
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}
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fn run(
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&self,
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plugin: &Self::Plugin,
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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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if let Some(handle) = input
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.as_custom_value()?
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.as_any()
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.downcast_ref::<HandleCustomValue>()
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{
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// Find the handle
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let value = plugin
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.handles
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.lock()
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.map_err(|err| LabeledError::new(err.to_string()))?
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.get(&handle.0)
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.cloned();
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if let Some(value) = value {
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Ok(value)
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} else {
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Err(LabeledError::new("Handle expired")
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.with_label("this handle is no longer valid", input.span())
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.with_help("the plugin may have exited, or there was a bug"))
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}
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} else {
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Err(ShellError::UnsupportedInput {
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msg: "requires HandleCustomValue".into(),
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input: format!("got {}", input.get_type()),
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msg_span: call.head,
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input_span: input.span(),
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}
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.into())
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}
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}
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}
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