nushell/crates/nu-cli/src/commands/append.rs
2020-05-30 11:36:04 +12:00

69 lines
1.6 KiB
Rust

use crate::commands::WholeStreamCommand;
use crate::context::CommandRegistry;
use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{Signature, SyntaxShape, UntaggedValue, Value};
#[derive(Deserialize)]
struct AppendArgs {
row: Value,
}
pub struct Append;
#[async_trait]
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"
}
async fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
let (AppendArgs { row }, input) = args.process(registry).await?;
let eos = futures::stream::iter(vec![row]);
Ok(input.chain(eos).to_output_stream())
}
fn examples(&self) -> Vec<Example> {
vec![Example {
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(),
]),
}]
}
}
#[cfg(test)]
mod tests {
use super::Append;
#[test]
fn examples_work_as_expected() {
use crate::examples::test as test_examples;
test_examples(Append {})
}
}