forked from extern/nushell
65 lines
1.5 KiB
Rust
65 lines
1.5 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::{
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Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Span,
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Value,
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};
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#[derive(Clone)]
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pub struct Reverse;
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impl Command for Reverse {
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fn name(&self) -> &str {
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"reverse"
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}
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fn signature(&self) -> nu_protocol::Signature {
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Signature::build("reverse").category(Category::Filters)
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}
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fn usage(&self) -> &str {
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"Reverses the table."
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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example: "[0,1,2,3] | reverse",
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description: "Reverse the items",
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result: Some(Value::List {
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vals: vec![
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Value::test_int(3),
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Value::test_int(2),
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Value::test_int(1),
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Value::test_int(0),
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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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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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#[allow(clippy::needless_collect)]
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let v: Vec<_> = input.into_iter().collect();
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let iter = v.into_iter().rev();
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Ok(iter.into_pipeline_data(engine_state.ctrlc.clone()))
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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(Reverse {})
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}
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}
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