5f550a355b
* Split OutputStream into ActionStream/OutputStream * Fmt * Missed update * Cleanup helper names * Fmt
50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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use nu_source::Tagged;
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use super::support::{rotate, Direction};
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pub struct SubCommand;
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#[derive(Deserialize)]
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pub struct Arguments {
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by: Option<Tagged<u64>>,
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}
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impl WholeStreamCommand for SubCommand {
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fn name(&self) -> &str {
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"roll up"
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}
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fn signature(&self) -> Signature {
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Signature::build("roll up").optional("by", SyntaxShape::Int, "the number of times to roll")
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}
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fn usage(&self) -> &str {
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"Rolls the table rows"
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}
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fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
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roll(args)
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}
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}
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pub fn roll(args: CommandArgs) -> Result<ActionStream, ShellError> {
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let name = args.call_info.name_tag.clone();
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let (args, mut input) = args.process()?;
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let values = input.drain_vec();
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Ok((roll_up(values, &args)
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.unwrap_or_else(|| vec![UntaggedValue::nothing().into_value(&name)])
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.into_iter()
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.map(ReturnSuccess::value))
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.to_action_stream())
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}
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fn roll_up(values: Vec<Value>, Arguments { by: ref n }: &Arguments) -> Option<Vec<Value>> {
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rotate(values, n, Direction::Up)
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}
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