csample/
csample.rs

1//! This example shows dynamic shell completion features
2
3fn complete_calculator(input: &String) -> Vec<(&'static str, Option<&'static str>)> {
4    let items = ["alpha", "beta", "banana", "cat", "durian"];
5    items
6        .iter()
7        .filter(|item| item.starts_with(input))
8        .map(|item| (*item, None))
9        .collect::<Vec<_>>()
10}
11
12fn main() {
13    use bpaf::*;
14
15    let a = short('a').long("avocado").help("Use avocado").switch();
16    let b = short('b').long("banana").help("Use banana").switch();
17    let bb = long("bananananana").help("I'm Batman").switch();
18    let c = long("calculator")
19        .help("calculator expression")
20        .argument::<String>("EXPR")
21        .complete(complete_calculator);
22    let parser = construct!(a, b, bb, c)
23        .to_options()
24        .descr("Dynamic autocomplete example")
25        .footer(
26            "\
27    bpaf supports dynamic autocompletion for a few shells, make sure your binary is in $PATH
28     and try using one of those this output should go into a file that depends on your shell:
29    $ csample --bpaf-complete-style-bash
30    $ csample --bpaf-complete-style-zsh
31    $ csample --bpaf-complete-style-fish
32    $ csample --bpaf-complete-style-elvish",
33        );
34
35    println!("{:?}", parser.fallback_to_usage().run());
36}