forked from extern/nushell
71 lines
1.6 KiB
Rust
71 lines
1.6 KiB
Rust
use crate::commands::WholeStreamCommand;
|
|
use crate::context::CommandRegistry;
|
|
use crate::deserializer::NumericRange;
|
|
use crate::prelude::*;
|
|
use nu_errors::ShellError;
|
|
use nu_protocol::{ReturnSuccess, Signature, SyntaxShape};
|
|
use nu_source::Tagged;
|
|
|
|
#[derive(Deserialize)]
|
|
struct RangeArgs {
|
|
area: Tagged<NumericRange>,
|
|
}
|
|
|
|
pub struct Range;
|
|
|
|
#[async_trait]
|
|
impl WholeStreamCommand for Range {
|
|
fn name(&self) -> &str {
|
|
"range"
|
|
}
|
|
|
|
fn signature(&self) -> Signature {
|
|
Signature::build("range").required(
|
|
"rows ",
|
|
SyntaxShape::Range,
|
|
"range of rows to return: Eg) 4..7 (=> from 4 to 7)",
|
|
)
|
|
}
|
|
|
|
fn usage(&self) -> &str {
|
|
"Return only the selected rows"
|
|
}
|
|
|
|
async fn run(
|
|
&self,
|
|
args: CommandArgs,
|
|
registry: &CommandRegistry,
|
|
) -> Result<OutputStream, ShellError> {
|
|
range(args, registry).await
|
|
}
|
|
}
|
|
|
|
async fn range(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
|
|
let registry = registry.clone();
|
|
let (RangeArgs { area }, input) = args.process(®istry).await?;
|
|
let range = area.item;
|
|
let (from, _) = range.from;
|
|
let (to, _) = range.to;
|
|
|
|
let from = *from as usize;
|
|
let to = *to as usize;
|
|
|
|
Ok(input
|
|
.skip(from)
|
|
.take(to - from + 1)
|
|
.map(ReturnSuccess::value)
|
|
.to_output_stream())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::Range;
|
|
|
|
#[test]
|
|
fn examples_work_as_expected() {
|
|
use crate::examples::test as test_examples;
|
|
|
|
test_examples(Range {})
|
|
}
|
|
}
|