在子命令后通过structopt crate使用CLI参数可以按照以下步骤进行操作:
[dependencies]
structopt = "0.3"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
#[structopt(name = "mycli", about = "A CLI tool")]
struct Cli {
#[structopt(short, long)]
name: String,
#[structopt(subcommand)]
subcommand: Option<Subcommand>,
}
#[derive(Debug, StructOpt)]
enum Subcommand {
#[structopt(name = "command1", about = "Subcommand 1")]
Command1 {
#[structopt(short, long)]
option1: String,
// add more options as needed
},
#[structopt(name = "command2", about = "Subcommand 2")]
Command2 {
#[structopt(short, long)]
option2: String,
// add more options as needed
},
// add more subcommands as needed
}
在上面的例子中,Cli结构体表示主命令的选项,subcommand字段是一个Option枚举类型,用于表示子命令。Subcommand枚举类型定义了两个子命令:command1和command2,并为它们定义了各自的选项。
fn main() {
let args = Cli::from_args();
match args.subcommand {
Some(Subcommand::Command1 { option1 }) => {
// handle command1 with option1
println!("Running command1 with option1: {}", option1);
},
Some(Subcommand::Command2 { option2 }) => {
// handle command2 with option2
println!("Running command2 with option2: {}", option2);
},
None => {
// handle main command without subcommand
println!("Running main command");
},
}
}
在上面的例子中,我们使用match表达式根据子命令的类型和选项来处理不同的逻辑。
$ cargo build
$ cargo run -- command1 --option1=value1
在上面的例子中,我们使用cargo run命令来运行程序,并指定了子命令command1和option1的值。
通过上述步骤,你就可以在子命令后通过structopt crate使用CLI参数了。当然,具体的实现方式可以根据你的实际需求进行调整和扩展。关于structopt crate的更多用法和示例,请参考其官方文档:structopt文档。
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