forked from extern/nushell
85 lines
2.1 KiB
Rust
85 lines
2.1 KiB
Rust
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, 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 abs"
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}
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fn signature(&self) -> Signature {
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Signature::build("math abs").category(Category::Math)
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}
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fn usage(&self) -> &str {
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"Returns absolute values of a list of numbers"
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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<nu_protocol::PipelineData, nu_protocol::ShellError> {
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let head = call.head;
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input.map(
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move |value| abs_helper(value, head),
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engine_state.ctrlc.clone(),
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)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Get absolute of each value in a list of numbers",
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example: "[-50 -100.0 25] | math abs",
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result: Some(Value::List {
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vals: vec![
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Value::test_int(50),
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Value::Float {
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val: 100.0,
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span: Span::test_data(),
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},
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Value::test_int(25),
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],
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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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fn abs_helper(val: Value, head: Span) -> Value {
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match val {
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Value::Int { val, span } => Value::int(val.abs(), span),
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Value::Float { val, span } => Value::Float {
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val: val.abs(),
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span,
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},
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Value::Duration { val, span } => Value::Duration {
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val: val.abs(),
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span,
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},
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_ => Value::Error {
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error: ShellError::UnsupportedInput(
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String::from("Only numerical values are supported"),
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head,
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),
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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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