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drop refactor (#12479)

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# Description
Refactors `drop` using `Vec::truncate` and adds a `NeedsPositiveValue`
error.

# User-Facing Changes
Breaking change: `drop` now errors if the number of rows/columns is
negative.
This commit is contained in:
Ian Manske 2024-04-12 15:44:00 +00:00 committed by GitHub
parent de41345bf2
commit 3eb9c2a565
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GPG Key ID: B5690EEEBB952194
1 changed files with 13 additions and 20 deletions
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29
crates/nu-command/src/filters/drop/drop_.rs
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@ -76,30 +76,23 @@ impl Command for Drop {
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let head = call.head;
let metadata = input.metadata();
let rows: Option<i64> = call.opt(engine_state, stack, 0)?;
let v: Vec<_> = input.into_iter_strict(call.head)?.collect();
let vlen: i64 = v.len() as i64;
let rows: Option<Spanned<i64>> = call.opt(engine_state, stack, 0)?;
let mut values = input.into_iter_strict(head)?.collect::<Vec<_>>();
let rows_to_drop = if let Some(quantity) = rows {
quantity
let rows_to_drop = if let Some(rows) = rows {
if rows.item < 0 {
return Err(ShellError::NeedsPositiveValue { span: rows.span });
} else {
rows.item as usize
}
} else {
1
};
if rows_to_drop == 0 {
Ok(v.into_iter()
.into_pipeline_data_with_metadata(metadata, engine_state.ctrlc.clone()))
} else {
let k = if vlen < rows_to_drop {
0
} else {
vlen - rows_to_drop
};
let iter = v.into_iter().take(k as usize);
Ok(iter.into_pipeline_data_with_metadata(metadata, engine_state.ctrlc.clone()))
}
values.truncate(values.len().saturating_sub(rows_to_drop));
Ok(Value::list(values, head).into_pipeline_data_with_metadata(metadata))
}
}