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.
120 lines
3.4 KiB
Rust
120 lines
3.4 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 arccos"
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}
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fn signature(&self) -> Signature {
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Signature::build("math arccos")
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.switch("degrees", "Return degrees instead of radians", Some('d'))
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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 arccosine of the number."
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["trigonometry", "inverse"]
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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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let use_degrees = call.has_flag(engine_state, stack, "degrees")?;
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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(
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move |value| operate(value, head, use_degrees),
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engine_state.signals(),
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)
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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: "Get the arccosine of 1",
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example: "1 | math arccos",
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result: Some(Value::test_float(0.0f64)),
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},
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Example {
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description: "Get the arccosine of -1 in degrees",
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example: "-1 | math arccos --degrees",
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result: Some(Value::test_float(180.0)),
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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, use_degrees: bool) -> Value {
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match value {
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numeric @ (Value::Int { .. } | Value::Float { .. }) => {
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let span = numeric.span();
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let (val, span) = match numeric {
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Value::Int { val, .. } => (val as f64, span),
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Value::Float { val, .. } => (val, span),
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_ => unreachable!(),
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};
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if (-1.0..=1.0).contains(&val) {
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let val = val.acos();
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let val = if use_degrees { val.to_degrees() } else { val };
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Value::float(val, span)
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} else {
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Value::error(
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ShellError::UnsupportedInput {
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msg: "'arccos' undefined for values outside the closed interval [-1, 1]."
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.into(),
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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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}
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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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#[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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