nushell/crates/nu-cli/src/commands/append.rs

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use crate::commands::WholeStreamCommand;
use crate::context::CommandRegistry;
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use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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#[derive(Deserialize)]
struct AppendArgs {
row: Value,
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}
pub struct Append;
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#[async_trait]
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impl WholeStreamCommand for Append {
fn name(&self) -> &str {
"append"
}
fn signature(&self) -> Signature {
Signature::build("append").required(
"row value",
SyntaxShape::Any,
"the value of the row to append to the table",
)
}
fn usage(&self) -> &str {
"Append the given row to the table"
}
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async fn run(
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&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
append(args, registry)
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}
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fn examples(&self) -> Vec<Example> {
vec![Example {
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description: "Add something to the end of a list or table",
example: "echo [1 2 3] | append 4",
result: Some(vec![
UntaggedValue::int(1).into(),
UntaggedValue::int(2).into(),
UntaggedValue::int(3).into(),
UntaggedValue::int(4).into(),
]),
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}]
}
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}
fn append(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
let registry = registry.clone();
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let stream = async_stream! {
let (AppendArgs { row }, mut input) = args.process(&registry).await?;
while let Some(item) = input.next().await {
yield ReturnSuccess::value(item);
}
yield ReturnSuccess::value(row);
};
Ok(stream.to_output_stream())
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}
#[cfg(test)]
mod tests {
use super::Append;
#[test]
fn examples_work_as_expected() {
use crate::examples::test as test_examples;
test_examples(Append {})
}
}