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https://github.com/nushell/nushell.git
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399a7c8836
# Description This PR introduces a new `Signals` struct to replace our adhoc passing around of `ctrlc: Option<Arc<AtomicBool>>`. Doing so has a few benefits: - We can better enforce when/where resetting or triggering an interrupt is allowed. - Consolidates `nu_utils::ctrl_c::was_pressed` and other ad-hoc re-implementations into a single place: `Signals::check`. - This allows us to add other types of signals later if we want. E.g., exiting or suspension. - Similarly, we can more easily change the underlying implementation if we need to in the future. - Places that used to have a `ctrlc` of `None` now use `Signals::empty()`, so we can double check these usages for correctness in the future.
112 lines
2.9 KiB
Rust
112 lines
2.9 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 sqrt"
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}
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fn signature(&self) -> Signature {
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Signature::build("math sqrt")
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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 usage(&self) -> &str {
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"Returns the square root of the input number."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["square", "root"]
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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![Example {
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description: "Compute the square root of each number in a list",
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example: "[9 16] | math sqrt",
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result: Some(Value::list(
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vec![Value::test_float(3.0), Value::test_float(4.0)],
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Span::test_data(),
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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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let span = value.span();
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match value {
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Value::Int { val, .. } => {
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let squared = (val as f64).sqrt();
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if squared.is_nan() {
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return error_negative_sqrt(head, span);
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}
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Value::float(squared, span)
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}
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Value::Float { val, .. } => {
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let squared = val.sqrt();
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if squared.is_nan() {
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return error_negative_sqrt(head, span);
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}
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Value::float(squared, 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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fn error_negative_sqrt(head: Span, span: Span) -> Value {
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Value::error(
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ShellError::UnsupportedInput {
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msg: String::from("Can't square root a negative number"),
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input: "value originates from here".into(),
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msg_span: head,
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input_span: span,
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},
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span,
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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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