53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
use crate::commands::math::reducers::{reducer_for, Reduce};
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use crate::commands::math::utils::run_with_function;
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use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, UntaggedValue, Value};
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pub struct SubCommand;
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impl WholeStreamCommand 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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}
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fn usage(&self) -> &str {
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"Finds the maximum within a list of numbers or tables"
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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run_with_function(args, maximum)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Find the maximum of list of numbers",
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example: "echo [-50 100 25] | math max",
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result: Some(vec![UntaggedValue::int(100).into()]),
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}]
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}
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}
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pub fn maximum(values: &[Value], _name: &Tag) -> Result<Value, ShellError> {
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let max_func = reducer_for(Reduce::Maximum);
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max_func(Value::nothing(), values.to_vec())
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}
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#[cfg(test)]
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mod tests {
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use super::ShellError;
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use super::SubCommand;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test as test_examples;
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test_examples(SubCommand {})
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}
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}
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