093b9c1c5b
When the last command has an input value larger than the data its operating on it would crash. Added a check to ensure there are enough elements to take.
52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::errors::ShellError;
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use crate::parser::CommandRegistry;
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use crate::prelude::*;
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pub struct Last;
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#[derive(Deserialize)]
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pub struct LastArgs {
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amount: Tagged<u64>,
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}
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impl WholeStreamCommand for Last {
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fn name(&self) -> &str {
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"last"
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}
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fn signature(&self) -> Signature {
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Signature::build("last").required("amount", SyntaxShape::Number)
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}
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fn usage(&self) -> &str {
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"Show only the last number of rows."
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, last)?.run()
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}
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}
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fn last(
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LastArgs { amount }: LastArgs,
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context: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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let v: Vec<_> = context.input.into_vec().await;
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let count = (*amount as usize);
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if count < v.len() {
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let k = v.len() - count;
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for x in v[k..].iter() {
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let y: Tagged<Value> = x.clone();
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yield ReturnSuccess::value(y)
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}
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}
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};
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Ok(stream.to_output_stream())
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}
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