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'last' gets last row if no amount desired given.

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This commit is contained in:
Andrés N. Robalino
2019-10-15 05:41:34 -05:00
parent 821ee5e726
commit ec2e35ad81
2 changed files with 54 additions and 7 deletions
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18
src/commands/last.rs
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@ -7,7 +7,7 @@ pub struct Last;
#[derive(Deserialize)]
pub struct LastArgs {
amount: Tagged<u64>,
rows: Option<Tagged<u64>>,
}
impl WholeStreamCommand for Last {
@ -16,7 +16,7 @@ impl WholeStreamCommand for Last {
}
fn signature(&self) -> Signature {
Signature::build("last").required("amount", SyntaxShape::Number)
Signature::build("last").optional("rows", SyntaxShape::Number)
}
fn usage(&self) -> &str {
@ -32,13 +32,17 @@ impl WholeStreamCommand for Last {
}
}
fn last(
LastArgs { amount }: LastArgs,
context: RunnableContext,
) -> Result<OutputStream, ShellError> {
fn last(LastArgs { rows }: LastArgs, context: RunnableContext) -> Result<OutputStream, ShellError> {
let stream = async_stream! {
let v: Vec<_> = context.input.into_vec().await;
let count = (*amount as usize);
let rows_desired = if let Some(quantity) = rows {
*quantity
} else {
1
};
let count = (rows_desired as usize);
if count < v.len() {
let k = v.len() - count;
for x in v[k..].iter() {