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
使用注解来定义关联参数。
Cargo.toml
[package]
edition = "2021"
name = "game"
version = "1.0.0"[dependencies]
chrono = "0.4.23"
clap = {version = "4", features = ["derive"]}
main.rs
use chrono::{Datelike, Local};
use clap::{ArgGroup, Parser};/// 命令行参数
#[derive(Parser)]
#[command(author, version, about, long_about = None)]
#[command(group(ArgGroup::new("born").required(true) .args(["age", "year"]),
))]
struct Args {/// 年龄#[arg(short, long,value_parser = clap::value_parser!(u8))]age: Option<u8>,/// 出生年#[arg(short, long,value_parser = clap::value_parser!(i32))]year: Option<i32>,
}fn main() {let args = Args::parse();if let Some(param) = args.age {println!("年龄是：{}", param);let year = Local::now().year();println!("出生年是：{}", year - param as i32);} else {let year = args.year.unwrap();println!("年龄是：{}", Local::now().year() - year);println!("出生年是：{}", year);}
}
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 0.55sRunning `target/debug/game -h`
命令行参数Usage: game <--age <AGE>|--year <YEAR>>Options:-a, --age <AGE> 年龄-y, --year <YEAR> 出生年-h, --help Print help information-V, --version Print version information
使用
root@jiangbo12490:~/git/game# cargo run -- -a 44Finished dev [unoptimized + debuginfo] target(s) in 0.02sRunning `target/debug/game -a 44`
年龄是：44
出生年是：1978
root@jiangbo12490:~/git/game# cargo run -- -y 1978Finished dev [unoptimized + debuginfo] target(s) in 0.02sRunning `target/debug/game -y 1978`
年龄是：44
出生年是：1978
总结
使用注解来定义了关联的参数。