mirror of
https://github.com/nushell/nushell.git
synced 2025-05-01 16:44:27 +02:00
95b78eee25
# 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
45 lines
1.4 KiB
Rust
45 lines
1.4 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, SimplePluginCommand};
|
|
use nu_protocol::{Category, LabeledError, Signature, SyntaxShape, Value};
|
|
|
|
use crate::ExamplePlugin;
|
|
|
|
pub struct Three;
|
|
|
|
impl SimplePluginCommand for Three {
|
|
type Plugin = ExamplePlugin;
|
|
|
|
fn name(&self) -> &str {
|
|
"example three"
|
|
}
|
|
|
|
fn description(&self) -> &str {
|
|
"Plugin test example 3. Returns labeled error"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
// The signature defines the usage of the command inside Nu, and also automatically
|
|
// generates its help page.
|
|
Signature::build(self.name())
|
|
.required("a", SyntaxShape::Int, "required integer value")
|
|
.required("b", SyntaxShape::String, "required string value")
|
|
.switch("flag", "a flag for the signature", Some('f'))
|
|
.optional("opt", SyntaxShape::Int, "Optional number")
|
|
.named("named", SyntaxShape::String, "named string", Some('n'))
|
|
.rest("rest", SyntaxShape::String, "rest value string")
|
|
.category(Category::Experimental)
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
plugin: &ExamplePlugin,
|
|
_engine: &EngineInterface,
|
|
call: &EvaluatedCall,
|
|
input: &Value,
|
|
) -> Result<Value, LabeledError> {
|
|
plugin.print_values(3, call, input)?;
|
|
|
|
Err(LabeledError::new("ERROR from plugin")
|
|
.with_label("error message pointing to call head span", call.head))
|
|
}
|
|
}
|