posixly_correct/
posixly_correct.rs

1//! POSIX [recommends](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html#tag_12_02)
2//! that no more options are parsed after the first positional argument.
3//! The other arguments are then all treated as positional arguments.
4//!
5//! lexopt can be used like this. After seeing the first positional argument
6//! (`Arg::Value`), call `Parser::raw_args`.
7//!
8//! The most logical thing to then do is often to collect the values
9//! into a `Vec`. This is shown below.
10//!
11//! Note that most modern software doesn't follow POSIX's rule and allows
12//! options anywhere (as long as they come before "--").
13
14fn main() -> Result<(), lexopt::Error> {
15    use lexopt::prelude::*;
16
17    let mut parser = lexopt::Parser::from_env();
18    let mut free = Vec::new();
19    while let Some(arg) = parser.next()? {
20        match arg {
21            Short('n') | Long("number") => {
22                let num: u16 = parser.value()?.parse()?;
23                println!("Got number {}", num);
24            }
25            Long("shout") => {
26                println!("Got --shout");
27            }
28            Value(val) => {
29                free.push(val);
30                free.extend(parser.raw_args()?);
31            }
32            _ => return Err(arg.unexpected()),
33        }
34    }
35    println!("Got free args {:?}", free);
36    Ok(())
37}
posixly_correct/posixly_correct.rs

posixly_correct/
posixly_correct.rs
