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Add binary support to 'skip' (#4588)

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* Add binary support to 'skip'

* add streaming
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JT 2022-02-21 13:23:43 -05:00 committed by GitHub
parent 6670b77b27
commit 24fc9c657e
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1 changed files with 54 additions and 7 deletions
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61
crates/nu-command/src/filters/skip/skip_.rs
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@ -4,8 +4,8 @@ use nu_engine::CallExt;
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Span,
SyntaxShape, Value,
Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData, ShellError,
Signature, Span, SyntaxShape, Value,
};
#[derive(Clone)]
@ -75,11 +75,58 @@ impl Command for Skip {
let ctrlc = engine_state.ctrlc.clone();
Ok(input
.into_iter()
.skip(n)
.into_pipeline_data(ctrlc)
.set_metadata(metadata))
match input {
PipelineData::RawStream(stream, bytes_span, metadata) => {
let mut remaining = n;
let mut output = vec![];
for frame in stream {
let frame = frame?;
match frame {
Value::String { val, .. } => {
let bytes = val.as_bytes();
if bytes.len() < remaining {
remaining -= bytes.len();
output.extend_from_slice(bytes)
} else {
output.extend_from_slice(&bytes[0..remaining]);
break;
}
}
Value::Binary { val: bytes, .. } => {
if bytes.len() < remaining {
remaining -= bytes.len();
output.extend_from_slice(&bytes)
} else {
output.extend_from_slice(&bytes[0..remaining]);
break;
}
}
_ => unreachable!("Raw streams are either bytes or strings"),
}
}
Ok(Value::Binary {
val: output,
span: bytes_span,
}
.into_pipeline_data()
.set_metadata(metadata))
}
PipelineData::Value(Value::Binary { val, span }, metadata) => {
let bytes = val.into_iter().skip(n).collect::<Vec<_>>();
Ok(Value::Binary { val: bytes, span }
.into_pipeline_data()
.set_metadata(metadata))
}
_ => Ok(input
.into_iter()
.skip(n)
.into_pipeline_data(ctrlc)
.set_metadata(metadata)),
}
}
}