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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
63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
use nu_plugin::{EngineInterface, EvaluatedCall, SimplePluginCommand};
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use nu_protocol::{Category, IntoValue, LabeledError, Signature, SyntaxShape, Value};
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use crate::ExamplePlugin;
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pub struct Two;
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impl SimplePluginCommand for Two {
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type Plugin = ExamplePlugin;
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fn name(&self) -> &str {
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"example two"
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}
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fn description(&self) -> &str {
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"Plugin test example 2. Returns list of records"
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}
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fn signature(&self) -> Signature {
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// The signature defines the usage of the command inside Nu, and also automatically
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// generates its help page.
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Signature::build(self.name())
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.required("a", SyntaxShape::Int, "required integer value")
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.required("b", SyntaxShape::String, "required string value")
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.switch("flag", "a flag for the signature", Some('f'))
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.optional("opt", SyntaxShape::Int, "Optional number")
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.named("named", SyntaxShape::String, "named string", Some('n'))
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.rest("rest", SyntaxShape::String, "rest value string")
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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: &ExamplePlugin,
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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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plugin.print_values(2, call, input)?;
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// Use the IntoValue derive macro and trait to easily design output data.
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#[derive(IntoValue)]
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struct Output {
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one: i64,
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two: i64,
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three: i64,
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}
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let vals = (0..10i64)
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.map(|i| {
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Output {
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one: i,
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two: 2 * i,
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three: 3 * i,
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}
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.into_value(call.head)
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})
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.collect();
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Ok(Value::list(vals, call.head))
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}
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}
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