101 lines
2.8 KiB
Rust
101 lines
2.8 KiB
Rust
use crate::input_handler::{operate, CellPathOnlyArgs};
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use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::ast::CellPath;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::Category;
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use nu_protocol::{Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, 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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"str reverse"
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}
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fn signature(&self) -> Signature {
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Signature::build("str reverse")
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.input_output_types(vec![(Type::String, Type::String)])
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.vectorizes_over_list(true)
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.rest(
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"rest",
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SyntaxShape::CellPath,
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"For a data structure input, reverse strings at the given cell paths",
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)
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.category(Category::Strings)
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}
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fn usage(&self) -> &str {
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"Reverse every string in the pipeline"
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}
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fn search_terms(&self) -> Vec<&str> {
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vec!["convert", "inverse", "flip"]
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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 cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
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let args = CellPathOnlyArgs::from(cell_paths);
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operate(action, args, input, call.head, engine_state.ctrlc.clone())
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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: "Reverse a single string",
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example: "'Nushell' | str reverse",
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result: Some(Value::test_string("llehsuN")),
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},
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Example {
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description: "Reverse multiple strings in a list",
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example: "['Nushell' 'is' 'cool'] | str reverse",
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result: Some(Value::List {
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vals: vec![
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Value::test_string("llehsuN"),
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Value::test_string("si"),
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Value::test_string("looc"),
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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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}
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fn action(input: &Value, _arg: &CellPathOnlyArgs, head: Span) -> Value {
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match input {
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Value::String { val, .. } => Value::String {
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val: val.chars().rev().collect::<String>(),
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span: head,
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},
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Value::Error { .. } => input.clone(),
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_ => Value::Error {
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error: ShellError::OnlySupportsThisInputType(
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"string".into(),
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input.get_type().to_string(),
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head,
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input.expect_span(),
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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 tests {
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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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