forked from extern/nushell
32 lines
787 B
Rust
32 lines
787 B
Rust
use crate::errors::ShellError;
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use crate::prelude::*;
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// TODO: "Amount remaining" wrapper
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pub fn first(args: CommandArgs) -> Result<OutputStream, ShellError> {
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if args.len() == 0 {
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return Err(ShellError::maybe_labeled_error(
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"First requires an amount",
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"needs parameter",
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args.call_info.name_span,
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));
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}
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let amount = args.expect_nth(0)?.as_i64();
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let amount = match amount {
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Ok(o) => o,
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Err(_) => {
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return Err(ShellError::labeled_error(
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"Value is not a number",
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"expected integer",
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args.expect_nth(0)?.span,
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))
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}
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};
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let input = args.input;
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Ok(OutputStream::from_input(input.values.take(amount as u64)))
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}
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