forked from extern/nushell
105 lines
2.8 KiB
Rust
105 lines
2.8 KiB
Rust
use nu_engine::CallExt;
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use nu_protocol::ast::Call;
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use nu_protocol::engine::{Command, EngineState, Stack};
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use nu_protocol::{
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Category, Example, PipelineData, Range, ShellError, Signature, SyntaxShape, Value,
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};
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use rand::prelude::{thread_rng, Rng};
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use std::cmp::Ordering;
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#[derive(Clone)]
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pub struct SubCommand;
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impl Command for SubCommand {
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fn name(&self) -> &str {
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"random integer"
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}
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fn signature(&self) -> Signature {
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Signature::build("random integer")
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.optional("range", SyntaxShape::Range, "Range of values")
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.category(Category::Random)
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}
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fn usage(&self) -> &str {
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"Generate a random integer [min..max]"
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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_input: PipelineData,
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) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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integer(engine_state, stack, call)
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Generate an unconstrained random integer",
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example: "random integer",
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result: None,
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},
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Example {
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description: "Generate a random integer less than or equal to 500",
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example: "random integer ..500",
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result: None,
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},
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Example {
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description: "Generate a random integer greater than or equal to 100000",
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example: "random integer 100000..",
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result: None,
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},
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Example {
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description: "Generate a random integer between 1 and 10",
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example: "random integer 1..10",
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result: None,
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},
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]
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}
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}
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fn integer(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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) -> Result<PipelineData, ShellError> {
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let span = call.head;
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let range: Option<Range> = call.opt(engine_state, stack, 0)?;
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let (min, max) = if let Some(r) = range {
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(r.from.as_integer()?, r.to.as_integer()?)
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} else {
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(0, i64::MAX)
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};
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match min.partial_cmp(&max) {
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Some(Ordering::Greater) => Err(ShellError::InvalidRange(
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min.to_string(),
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max.to_string(),
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span,
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)),
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Some(Ordering::Equal) => Ok(PipelineData::Value(Value::Int { val: min, span }, None)),
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_ => {
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let mut thread_rng = thread_rng();
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let result: i64 = thread_rng.gen_range(min..max);
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Ok(PipelineData::Value(Value::Int { val: result, span }, None))
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(SubCommand {})
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}
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}
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