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Easily add address & port flags to CLIs using Clap
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clap-rs/clap-port-flag
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Easily add a--port flag to CLIs using clap.
With the following code insrc/main.rs:
use clap::Parser;use clap_port_flag::Port;#[derive(Debug,Parser)]structCli{#[clap(flatten)]port:Port,}fnmain(){let args =Cli::parse();let _tcp_listener = args.port.bind().unwrap();}
When you run the binary, it'll provide the following output:
my-cool-app 0.2.0Alice Person <alice@person.com>Application that does things over TCP.USAGE: main [OPTIONS]FLAGS: -h, --help Prints help information -V, --version Prints version informationOPTIONS: --listen-fd <fd> A previously opened network socket. [env: LISTEN_FD=] -a, --address <hostname> The network address to listen to. [default: 127.0.0.1] -p, --port <port> The network port to listen to. [env: PORT=]
use clap_port_flag::Port;use futures::prelude::*;use hyper::service::service_fn;use hyper::{Body,Response,Request};use clap::Parser;#[derive(Debug,Parser)]structCli{#[clap(flatten)]port:Port,}asyncfnhello(_:Request<Body>) ->Result<Response<String>, std::convert::Infallible>{Ok(Response::new(String::from("Hello World!")))}#[tokio::main]asyncfnmain() ->Result<(),Box<dyn std::error::Error>>{let args =Cli::parse();let listener = args.port.bind()?;let listener = tokio::net::TcpListener::from_std(listener)?;let addr = listener.local_addr()?;println!("Server listening on {}", addr);let(stream, _) = listener.accept().await?;ifletErr(e) = hyper::server::conn::Http::new().serve_connection(stream,service_fn(hello)).await{eprintln!("server error: {}", e);}Ok(())}
$ cargo add clap-port-flag
The original version of this crate was sketched out by@TeXitoi inrust-lang-nursery/cli-wg#37.
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Easily add address & port flags to CLIs using Clap
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