0256-CLAP-参数可选值

环境

• Time 2022-12-03
• WSL-Ubuntu 22.04
• CLAP 4.0.29

前言

说明

参考：https://docs.rs/clap/latest/clap/index.html

目标

限制参数可以选择的值有哪些。

Cargo.toml

[package]
edition = "2021"
name = "game"
version = "1.0.0"[dependencies]
clap = {version = "4", features = ["cargo"]}

main.rs

use clap::{command, Arg};fn main() {let matches = command!().arg(Arg::new("name").value_parser(["张三", "李四"]).help("姓名")).get_matches();if let Some(param) = matches.get_one::<String>("name") {println!("set 的姓名是: {}", param);}
}

查看帮助

root@jiangbo12490:~/git/game# cargo run -- -hCompiling game v1.0.0 (/root/git/game)Finished dev [unoptimized + debuginfo] target(s) in 0.44sRunning `target/debug/game -h`
Usage: game [name]Arguments:[name]  姓名 [possible values: 张三, 李四]Options:-h, --help     Print help information-V, --version  Print version information

使用

root@jiangbo12490:~/git/game# cargo run 张三Finished dev [unoptimized + debuginfo] target(s) in 0.01sRunning `target/debug/game '张三'`
set 的姓名是: 张三
root@jiangbo12490:~/git/game# cargo run 王五Finished dev [unoptimized + debuginfo] target(s) in 0.01sRunning `target/debug/game '王五'`
error: '王五' isn't a valid value for '[name]'[possible values: 张三, 李四]For more information try '--help'

总结

限制参数可以输入的值有哪些。

附录