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.
100 lines
2.8 KiB
Rust
100 lines
2.8 KiB
Rust
use nu_cmd_base::input_handler::{operate, CellPathOnlyArgs};
|
|
use nu_engine::command_prelude::*;
|
|
|
|
#[derive(Clone)]
|
|
pub struct BytesReverse;
|
|
|
|
impl Command for BytesReverse {
|
|
fn name(&self) -> &str {
|
|
"bytes reverse"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("bytes reverse")
|
|
.input_output_types(vec![
|
|
(Type::Binary, Type::Binary),
|
|
(Type::table(), Type::table()),
|
|
(Type::record(), Type::record()),
|
|
])
|
|
.allow_variants_without_examples(true)
|
|
.rest(
|
|
"rest",
|
|
SyntaxShape::CellPath,
|
|
"For a data structure input, reverse data at the given cell paths.",
|
|
)
|
|
.category(Category::Bytes)
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"Reverse the bytes in the pipeline."
|
|
}
|
|
|
|
fn search_terms(&self) -> Vec<&str> {
|
|
vec!["convert", "inverse", "flip"]
|
|
}
|
|
|
|
fn run(
|
|
&self,
|
|
engine_state: &EngineState,
|
|
stack: &mut Stack,
|
|
call: &Call,
|
|
input: PipelineData,
|
|
) -> Result<PipelineData, ShellError> {
|
|
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
|
|
let arg = CellPathOnlyArgs::from(cell_paths);
|
|
operate(reverse, arg, input, call.head, engine_state.signals())
|
|
}
|
|
|
|
fn examples(&self) -> Vec<Example> {
|
|
vec![
|
|
Example {
|
|
description: "Reverse bytes `0x[1F FF AA AA]`",
|
|
example: "0x[1F FF AA AA] | bytes reverse",
|
|
result: Some(Value::binary(
|
|
vec![0xAA, 0xAA, 0xFF, 0x1F],
|
|
Span::test_data(),
|
|
)),
|
|
},
|
|
Example {
|
|
description: "Reverse bytes `0x[FF AA AA]`",
|
|
example: "0x[FF AA AA] | bytes reverse",
|
|
result: Some(Value::binary(vec![0xAA, 0xAA, 0xFF], Span::test_data())),
|
|
},
|
|
]
|
|
}
|
|
}
|
|
|
|
fn reverse(val: &Value, _args: &CellPathOnlyArgs, span: Span) -> Value {
|
|
let val_span = val.span();
|
|
match val {
|
|
Value::Binary { val, .. } => {
|
|
let mut reversed_input = val.to_vec();
|
|
reversed_input.reverse();
|
|
Value::binary(reversed_input, val_span)
|
|
}
|
|
// Propagate errors by explicitly matching them before the final case.
|
|
Value::Error { .. } => val.clone(),
|
|
other => Value::error(
|
|
ShellError::OnlySupportsThisInputType {
|
|
exp_input_type: "binary".into(),
|
|
wrong_type: other.get_type().to_string(),
|
|
dst_span: span,
|
|
src_span: other.span(),
|
|
},
|
|
span,
|
|
),
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_examples() {
|
|
use crate::test_examples;
|
|
|
|
test_examples(BytesReverse {})
|
|
}
|
|
}
|