0261-CLAP-使用注解

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

使用注解来提供命令行的参数。

Cargo.toml

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

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

main.rs

use clap::Parser;

/// 命令行参数
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
struct Args {
    /// 姓名
    #[arg(short, long)]
    name: String,
}

fn main() {
    let args = Args::parse();
    println!("姓名是：{}", args.name);
}

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`
命令行参数

Usage: game --name <NAME>

Options:
  -n, --name <NAME>  姓名
  -h, --help         Print help information
  -V, --version      Print version information

查看版本

root@jiangbo12490:~/git/game# cargo run -- -V
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
     Running `target/debug/game -V`
game 1.0.0

使用

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

总结

使用注解来解析命令行的参数。

附录