nu_cmd_lang/core_commands/
export_const.rs

1use nu_engine::command_prelude::*;
2use nu_protocol::engine::CommandType;
3
4#[derive(Clone)]
5pub struct ExportConst;
6
7impl Command for ExportConst {
8    fn name(&self) -> &str {
9        "export const"
10    }
11
12    fn description(&self) -> &str {
13        "Use parse-time constant from a module and export them from this module."
14    }
15
16    fn signature(&self) -> nu_protocol::Signature {
17        Signature::build("export const")
18            .input_output_types(vec![(Type::Nothing, Type::Nothing)])
19            .allow_variants_without_examples(true)
20            .required("const_name", SyntaxShape::VarWithOptType, "Constant name.")
21            .required(
22                "initial_value",
23                SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::MathExpression)),
24                "Equals sign followed by constant value.",
25            )
26            .category(Category::Core)
27    }
28
29    fn extra_description(&self) -> &str {
30        r#"This command is a parser keyword. For details, check:
31  https://www.nushell.sh/book/thinking_in_nu.html"#
32    }
33
34    fn command_type(&self) -> CommandType {
35        CommandType::Keyword
36    }
37
38    fn run(
39        &self,
40        _engine_state: &EngineState,
41        _stack: &mut Stack,
42        _call: &Call,
43        _input: PipelineData,
44    ) -> Result<PipelineData, ShellError> {
45        Ok(PipelineData::empty())
46    }
47
48    fn examples(&self) -> Vec<Example> {
49        vec![Example {
50            description: "Re-export a command from another module",
51            example: r#"module spam { export const foo = 3; }
52    module eggs { export use spam foo }
53    use eggs foo
54    foo
55            "#,
56            result: Some(Value::test_int(3)),
57        }]
58    }
59
60    fn search_terms(&self) -> Vec<&str> {
61        vec!["reexport", "import", "module"]
62    }
63}
nu_cmd_lang/core_commands/export_const.rs

nu_cmd_lang/core_commands/
export_const.rs
