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# Description Working on uniformizing the ending messages regarding methods usage() and extra_usage(). This is related to the issue https://github.com/nushell/nushell/issues/5066 after discussing it with @jntrnr # User-Facing Changes None. # Tests + Formatting Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass # After Submitting If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date.
78 lines
2.2 KiB
Rust
78 lines
2.2 KiB
Rust
use crate::math::reducers::{reducer_for, Reduce};
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use crate::math::utils::run_with_function;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
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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 max"
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}
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fn signature(&self) -> Signature {
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Signature::build("math max")
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.input_output_types(vec![
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(Type::List(Box::new(Type::Number)), Type::Number),
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(Type::Table(vec![]), Type::Record(vec![])),
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])
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.category(Category::Math)
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}
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fn usage(&self) -> &str {
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"Returns the maximum of a list of numbers, or of columns in a table."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["maximum", "largest"]
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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, maximum)
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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: "Find the maximum of list of numbers",
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example: "[-50 100 25] | math max",
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result: Some(Value::test_int(100)),
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},
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Example {
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description: "Find the maxima of the columns of a table",
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example: "[{a: 1 b: 3} {a: 2 b: -1}] | math max",
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result: Some(Value::Record {
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cols: vec!["a".to_string(), "b".to_string()],
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vals: vec![Value::test_int(2), Value::test_int(3)],
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span: Span::test_data(),
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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 maximum(values: &[Value], span: Span, head: &Span) -> Result<Value, ShellError> {
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let max_func = reducer_for(Reduce::Maximum);
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max_func(Value::nothing(*head), values.to_vec(), span, *head)
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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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