forked from extern/nushell
56 lines
1.2 KiB
Rust
56 lines
1.2 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::prelude::*;
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use indexmap::set::IndexSet;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, Signature};
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pub struct Uniq;
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impl WholeStreamCommand for Uniq {
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fn name(&self) -> &str {
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"uniq"
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}
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fn signature(&self) -> Signature {
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Signature::build("uniq")
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}
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fn usage(&self) -> &str {
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"Return the unique 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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uniq(args, registry)
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}
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}
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fn uniq(args: CommandArgs, _registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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let mut input = args.input;
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let uniq_values: IndexSet<_> = input.collect().await;
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for item in uniq_values.iter().map(|row| ReturnSuccess::value(row.clone())) {
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yield item;
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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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#[cfg(test)]
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mod tests {
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use super::Uniq;
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#[test]
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fn examples_work_as_expected() {
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use crate::examples::test as test_examples;
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test_examples(Uniq {})
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}
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}
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