bpaf 0.4.3

A simple Command Line Argument Parser with parser combinators
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

//! When implementing a cargo subcommand parser needs to be able to skip the first argument which
//! is always the same as the executable name. For this example executable name is `cargo-cmd` so
//! first argument would be `cmd`. A way to support both cases - when it's present and it's absent
//! would be to use `positional_if`. `bpaf` also provides a helper `cargo_helper` that does exactly
//! this.

use bpaf::*;

#[derive(Debug, Clone)]
#[allow(dead_code)]
struct Opts {
    width: usize,
    height: usize,
}

fn main() {
    // defining a parser in a usual way
    let width = short('w').argument("WIDTH").from_str().fallback(10);
    let height = short('h').argument("HEIGHT").from_str().fallback(10);
    let parser = construct!(Opts { width, height });

    let cmd = positional_if("", |s| s == "cmd").optional().hide();
    let combined_parser = construct!(cmd, parser).map(|x| x.1);

    let opts = Info::default()
        .descr("Usual help message here")
        .for_parser(combined_parser)
        .run();

    println!("{:?}", opts);
}