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export_def.rs
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export_def.rs
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use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
};
#[derive(Clone)]
pub struct ExportDef;
impl Command for ExportDef {
fn name(&self) -> &str {
"export def"
}
fn usage(&self) -> &str {
"Define a custom command and export it from a module."
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("export def")
.input_output_types(vec![(Type::Nothing, Type::Nothing)])
.required("def_name", SyntaxShape::String, "Command name.")
.required("params", SyntaxShape::Signature, "Parameters.")
.required("block", SyntaxShape::Block, "Body of the definition.")
.switch("env", "keep the environment defined inside the command", None)
.switch("wrapped", "treat unknown flags and arguments as strings (requires ...rest-like parameter in signature)", None)
.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<PipelineData, ShellError> {
Ok(PipelineData::empty())
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Define a custom command in a module and call it",
example: r#"module spam { export def foo [] { "foo" } }; use spam foo; foo"#,
result: Some(Value::test_string("foo")),
}]
}
fn search_terms(&self) -> Vec<&str> {
vec!["module"]
}
}