INNER CODE UNIT · Rust

alias_expand_line

databricks/click · src/command_processor.rs:90

pub fn alias_expand_line(env: &Env, line: &str) -> String {
    let expa = env.try_expand_alias(line, None);
    let mut alias_stack = vec![expa];
    #[allow(clippy::while_let_loop)] // needed due to borrow restrictions
    loop {
        let expa = match alias_stack.last().unwrap().expansion {
            Some(prev) => {
                // previous thing expanded an alias, so try and expand that too
                env.try_expand_alias(prev.expanded.as_str(), Some(prev.alias.as_str()))
            }
            None => break,
        };
        alias_stack.push(expa);
    }
    // At this point, all the "real" stuff is in the chain of "rest" memebers of the
    // alias_stack, let's gather them up
    let rests: Vec<&str> = alias_stack.iter().rev().map(|ea| ea.rest).collect();
    rests.concat()

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