forked from extern/nushell
43 lines
912 B
Rust
43 lines
912 B
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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#[derive(Deserialize)]
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struct NthArgs {
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amount: Tagged<i64>,
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}
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pub struct Nth;
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impl WholeStreamCommand for Nth {
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fn name(&self) -> &str {
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"nth"
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}
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fn signature(&self) -> Signature {
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Signature::build("nth").required("row number", SyntaxShape::Any)
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}
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fn usage(&self) -> &str {
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"Return only the selected row"
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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, nth)?.run()
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}
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}
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fn nth(
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NthArgs { amount }: NthArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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Ok(OutputStream::from_input(
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input.values.skip(amount.item as u64).take(1),
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))
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}
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