0255-CLAP-增加子命令

环境

• Time 2022-12-02
• WSL-Ubuntu 22.04
• CLAP 4.0.29

前言

说明

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

目标

可以将命令进行分组，然后增加子命令。

Cargo.toml

[package]
edition = "2021"
name = "game"
version = "1.0.0"

[dependencies]
clap = {version = "4", features = ["cargo"]}

main.rs

use clap::{command, Arg, Command};

fn main() {
    let matches = command!()
        .subcommand(Command::new("set").arg(Arg::new("name").help("姓名")))
        .get_matches();

    match matches.subcommand() {
        Some(("set", sub_matches)) => {
            if let Some(param) = sub_matches.get_one::<String>("name") {
                println!("set 的姓名是: {}", param);
            }
        }
        _ => unreachable!(),
    }
}

查看帮助

root@jiangbo12490:~/git/game# cargo run -- -h
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/game -h`
Usage: game [COMMAND]

Commands:
  set
  help  Print this message or the help of the given subcommand(s)

Options:
  -h, --help     Print help information
  -V, --version  Print version information

使用

root@jiangbo12490:~/git/game# cargo run set 张三
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/game set '张三'`
set 的姓名是: 张三

总结

使用了子命令的功能。

附录