forked from extern/nushell
b2c5af457e
This improves incremental build time when working on what was previously the root package. For example, previously all plugins would be rebuilt with a change to `src/commands/classified/external.rs`, but now only `nu-cli` will have to be rebuilt (and anything that depends on it).
57 lines
1.3 KiB
Rust
57 lines
1.3 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::deserializer::NumericRange;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{Signature, SyntaxShape};
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use nu_source::Tagged;
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#[derive(Deserialize)]
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struct RangeArgs {
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area: Tagged<NumericRange>,
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}
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pub struct Range;
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impl WholeStreamCommand for Range {
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fn name(&self) -> &str {
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"range"
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}
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fn signature(&self) -> Signature {
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Signature::build("range").required(
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"rows ",
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SyntaxShape::Range,
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"range of rows to return: Eg) 4..7 (=> from 4 to 7)",
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)
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}
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fn usage(&self) -> &str {
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"Return only the selected rows"
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, range)?.run()
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}
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}
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fn range(
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RangeArgs { area }: RangeArgs,
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RunnableContext { input, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let range = area.item;
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let (from, _) = range.from;
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let (to, _) = range.to;
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let from = *from as usize;
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let to = *to as usize;
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Ok(OutputStream::from_input(
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input.values.skip(from).take(to - from + 1),
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))
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}
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