use nu_protocol::ast::Call; use nu_protocol::engine::{Command, EvaluationContext}; use nu_protocol::{Signature, SyntaxShape, Value}; pub struct Def; impl Command for Def { fn name(&self) -> &str { "def" } fn usage(&self) -> &str { "Define a custom command" } fn signature(&self) -> nu_protocol::Signature { Signature::build("def") .required("def_name", SyntaxShape::String, "definition name") .required("params", SyntaxShape::Signature, "parameters") .required("block", SyntaxShape::Block, "body of the definition") } fn run( &self, _context: &EvaluationContext, call: &Call, _input: Value, ) -> Result { Ok(Value::Nothing { span: call.head }) } }