nushell/src/commands/append.rs

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use crate::commands::WholeStreamCommand;
use crate::errors::ShellError;
use crate::parser::CommandRegistry;
use crate::prelude::*;
#[derive(Deserialize)]
struct AppendArgs {
row: Value,
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}
pub struct Append;
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"
}
fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
args.process(registry, append)?.run()
}
}
fn append(
AppendArgs { row }: AppendArgs,
RunnableContext { input, .. }: RunnableContext,
) -> Result<OutputStream, ShellError> {
let mut after: VecDeque<Value> = VecDeque::new();
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after.push_back(row);
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Ok(OutputStream::from_input(input.values.chain(after)))
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}