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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
99 lines
2.6 KiB
Rust
99 lines
2.6 KiB
Rust
use nu_engine::command_prelude::*;
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#[derive(Clone)]
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pub struct SubCommand;
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impl Command for SubCommand {
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fn name(&self) -> &str {
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"math exp"
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}
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fn signature(&self) -> Signature {
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Signature::build("math exp")
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.input_output_types(vec![
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(Type::Number, Type::Float),
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(
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Type::List(Box::new(Type::Number)),
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Type::List(Box::new(Type::Float)),
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),
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])
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.allow_variants_without_examples(true)
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.category(Category::Math)
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}
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fn description(&self) -> &str {
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"Returns e raised to the power of x."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["exponential", "exponentiation", "euler"]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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_stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let head = call.head;
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// This doesn't match explicit nulls
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if matches!(input, PipelineData::Empty) {
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return Err(ShellError::PipelineEmpty { dst_span: head });
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}
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input.map(move |value| operate(value, head), engine_state.signals())
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Get e raised to the power of zero",
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example: "0 | math exp",
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result: Some(Value::test_float(1.0f64)),
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},
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Example {
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description: "Get e (same as 'math e')",
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example: "1 | math exp",
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result: Some(Value::test_float(1.0f64.exp())),
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},
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]
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}
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}
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fn operate(value: Value, head: Span) -> Value {
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match value {
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numeric @ (Value::Int { .. } | Value::Float { .. }) => {
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let span = numeric.span();
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let (val, span) = match numeric {
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Value::Int { val, .. } => (val as f64, span),
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Value::Float { val, .. } => (val, span),
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_ => unreachable!(),
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};
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Value::float(val.exp(), span)
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}
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Value::Error { .. } => value,
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other => Value::error(
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ShellError::OnlySupportsThisInputType {
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exp_input_type: "numeric".into(),
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wrong_type: other.get_type().to_string(),
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dst_span: head,
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src_span: other.span(),
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},
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head,
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),
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(SubCommand {})
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}
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}
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