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.
138 lines
3.9 KiB
Rust
138 lines
3.9 KiB
Rust
use nu_cmd_base::input_handler::{operate, CmdArgument};
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use nu_engine::command_prelude::*;
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use std::{io::Write, marker::PhantomData};
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pub trait HashDigest: digest::Digest + Clone {
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fn name() -> &'static str;
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fn examples() -> Vec<Example<'static>>;
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}
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#[derive(Clone)]
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pub struct GenericDigest<D: HashDigest> {
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name: String,
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usage: String,
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phantom: PhantomData<D>,
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}
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impl<D: HashDigest> Default for GenericDigest<D> {
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fn default() -> Self {
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Self {
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name: format!("hash {}", D::name()),
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usage: format!("Hash a value using the {} hash algorithm.", D::name()),
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phantom: PhantomData,
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}
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}
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}
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pub(super) struct Arguments {
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pub(super) cell_paths: Option<Vec<CellPath>>,
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pub(super) binary: bool,
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}
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impl CmdArgument for Arguments {
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fn take_cell_paths(&mut self) -> Option<Vec<CellPath>> {
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self.cell_paths.take()
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}
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}
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impl<D> Command for GenericDigest<D>
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where
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D: HashDigest + Write + Send + Sync + 'static,
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digest::Output<D>: core::fmt::LowerHex,
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{
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fn name(&self) -> &str {
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&self.name
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name())
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.category(Category::Hash)
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.input_output_types(vec![
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(Type::String, Type::Any),
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(Type::table(), Type::table()),
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(Type::record(), Type::record()),
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])
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.allow_variants_without_examples(true)
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.switch(
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"binary",
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"Output binary instead of hexadecimal representation",
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Some('b'),
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)
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.rest(
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"rest",
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SyntaxShape::CellPath,
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format!("Optionally {} hash data by cell path.", D::name()),
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)
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}
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fn usage(&self) -> &str {
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&self.usage
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}
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fn examples(&self) -> Vec<Example<'static>> {
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D::examples()
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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 binary = call.has_flag(engine_state, stack, "binary")?;
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let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
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let cell_paths = (!cell_paths.is_empty()).then_some(cell_paths);
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let mut hasher = D::new();
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if let PipelineData::ByteStream(stream, ..) = input {
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stream.write_to(&mut hasher)?;
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let digest = hasher.finalize();
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if binary {
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Ok(Value::binary(digest.to_vec(), head).into_pipeline_data())
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} else {
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Ok(Value::string(format!("{digest:x}"), head).into_pipeline_data())
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}
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} else {
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let args = Arguments { binary, cell_paths };
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operate(action::<D>, args, input, head, engine_state.signals())
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}
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}
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}
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pub(super) fn action<D>(input: &Value, args: &Arguments, _span: Span) -> Value
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where
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D: HashDigest,
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digest::Output<D>: core::fmt::LowerHex,
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{
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let span = input.span();
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let (bytes, span) = match input {
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Value::String { val, .. } => (val.as_bytes(), span),
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Value::Binary { val, .. } => (val.as_slice(), span),
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// Propagate existing errors
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Value::Error { .. } => return input.clone(),
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other => {
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let span = input.span();
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return Value::error(
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ShellError::OnlySupportsThisInputType {
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exp_input_type: "string or binary".into(),
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wrong_type: other.get_type().to_string(),
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dst_span: span,
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src_span: other.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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let digest = D::digest(bytes);
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if args.binary {
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Value::binary(digest.to_vec(), span)
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} else {
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Value::string(format!("{digest:x}"), span)
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}
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}
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