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export_extern.rs
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export_extern.rs
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use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{Category, Example, PipelineData, Signature, SyntaxShape, Type};
#[derive(Clone)]
pub struct ExportExtern;
impl Command for ExportExtern {
fn name(&self) -> &str {
"export extern"
}
fn usage(&self) -> &str {
"Define an extern and export it from a module"
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("export extern")
.input_output_types(vec![(Type::Nothing, Type::Nothing)])
.required("def_name", SyntaxShape::String, "definition name")
.required("params", SyntaxShape::Signature, "parameters")
.category(Category::Core)
}
fn extra_usage(&self) -> &str {
r#"This command is a parser keyword. For details, check:
https://www.nushell.sh/book/thinking_in_nu.html"#
}
fn is_parser_keyword(&self) -> bool {
true
}
fn run(
&self,
_engine_state: &EngineState,
_stack: &mut Stack,
_call: &Call,
_input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
Ok(PipelineData::empty())
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Export the signature for an external command",
example: r#"export extern echo [text: string]"#,
result: None,
}]
}
fn search_terms(&self) -> Vec<&str> {
vec!["signature", "module", "declare"]
}
}