f075e2459d
* commands to engine * Correction of error in parser * Added detailed regex error to parse * better regex error parsing * clippy corrections * parse example with test * secondary error for regex * removed clone in error parser * Secondary error message
50 lines
1.2 KiB
Rust
50 lines
1.2 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::{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 Command;
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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 Command {
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fn name(&self) -> &str {
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"roll"
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}
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fn signature(&self) -> Signature {
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Signature::build("roll").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(&self, args: CommandArgs) -> Result<OutputStream, 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<OutputStream, ShellError> {
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let name = args.call_info.name_tag.clone();
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let mut args = args.evaluate_once()?;
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let options = Arguments { by: args.opt(0)? };
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let values = args.input.drain_vec();
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Ok(roll_down(values, &options)
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.unwrap_or_else(|| vec![UntaggedValue::nothing().into_value(&name)])
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.into_iter()
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.to_output_stream())
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}
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fn roll_down(values: Vec<Value>, Arguments { by: ref n }: &Arguments) -> Option<Vec<Value>> {
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rotate(values, n, Direction::Down)
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}
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