nu_cmd_lang/core_commands/scope/
externs.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
use nu_engine::{command_prelude::*, scope::ScopeData};

#[derive(Clone)]
pub struct ScopeExterns;

impl Command for ScopeExterns {
    fn name(&self) -> &str {
        "scope externs"
    }

    fn signature(&self) -> Signature {
        Signature::build("scope externs")
            .input_output_types(vec![(Type::Nothing, Type::Any)])
            .allow_variants_without_examples(true)
            .category(Category::Core)
    }

    fn description(&self) -> &str {
        "Output info on the known externals in the current scope."
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        _input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        let head = call.head;
        let mut scope_data = ScopeData::new(engine_state, stack);
        scope_data.populate_decls();
        Ok(Value::list(scope_data.collect_externs(head), head).into_pipeline_data())
    }

    fn examples(&self) -> Vec<Example> {
        vec![Example {
            description: "Show the known externals in the current scope",
            example: "scope externs",
            result: None,
        }]
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_examples() {
        use crate::test_examples;

        test_examples(ScopeExterns {})
    }
}