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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
110 lines
3.2 KiB
Rust
110 lines
3.2 KiB
Rust
use crate::math::{
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reducers::{reducer_for, Reduce},
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utils::run_with_function,
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};
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use nu_engine::command_prelude::*;
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const NS_PER_SEC: i64 = 1_000_000_000;
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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 avg"
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}
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fn signature(&self) -> Signature {
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Signature::build("math avg")
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.input_output_types(vec![
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(Type::List(Box::new(Type::Duration)), Type::Duration),
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(Type::Duration, Type::Duration),
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(Type::List(Box::new(Type::Filesize)), Type::Filesize),
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(Type::Filesize, Type::Filesize),
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(Type::List(Box::new(Type::Number)), Type::Number),
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(Type::Number, Type::Number),
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(Type::Range, Type::Number),
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(Type::table(), Type::record()),
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(Type::record(), Type::record()),
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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 the average of a list of numbers."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["average", "mean", "statistics"]
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}
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fn is_const(&self) -> bool {
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true
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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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run_with_function(call, input, average)
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}
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fn run_const(
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&self,
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_working_set: &StateWorkingSet,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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run_with_function(call, input, average)
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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: "Compute the average of a list of numbers",
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example: "[-50 100.0 25] | math avg",
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result: Some(Value::test_float(25.0)),
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},
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Example {
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description: "Compute the average of a list of durations",
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example: "[2sec 1min] | math avg",
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result: Some(Value::test_duration(31 * NS_PER_SEC)),
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},
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Example {
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description: "Compute the average of each column in a table",
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example: "[[a b]; [1 2] [3 4]] | math avg",
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result: Some(Value::test_record(record! {
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"a" => Value::test_int(2),
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"b" => Value::test_int(3),
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})),
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},
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]
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}
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}
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pub fn average(values: &[Value], span: Span, head: Span) -> Result<Value, ShellError> {
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let sum = reducer_for(Reduce::Summation);
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let total = &sum(Value::int(0, head), values.to_vec(), span, head)?;
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let span = total.span();
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match total {
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Value::Filesize { val, .. } => Ok(Value::filesize(val / values.len() as i64, span)),
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Value::Duration { val, .. } => Ok(Value::duration(val / values.len() as i64, span)),
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_ => total.div(head, &Value::int(values.len() as i64, head), head),
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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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