Once via structopt, now direct clap.

examples/ssr_router/Cargo.toml

@@ -17,8 +17,8 @@ wasm-logger = "0.2"
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 tokio = { version = "1.15.0", features = ["full"] }
 warp = "0.3"
-structopt = "0.3"
 env_logger = "0.9"
 num_cpus = "1.13"
 tokio-util = { version = "0.7", features = ["rt"] }
 once_cell = "1.5"
+clap = { version = "3.1.7", features = ["derive"] }

examples/ssr_router/src/bin/ssr_router_server.rs

@@ -1,16 +1,16 @@
+use clap::Parser;
 use function_router::{ServerApp, ServerAppProps};
 use once_cell::sync::Lazy;
 use std::collections::HashMap;
 use std::path::PathBuf;
-use structopt::StructOpt;
 use tokio_util::task::LocalPoolHandle;
 use warp::Filter;
 
 // We spawn a local pool that is as big as the number of cpu threads.
 static LOCAL_POOL: Lazy<LocalPoolHandle> = Lazy::new(|| LocalPoolHandle::new(num_cpus::get()));
 
 /// A basic example
-#[derive(StructOpt, Debug)]
+#[derive(Parser, Debug)]
 struct Opt {
     /// the "dist" created by trunk directory to be served for hydration.
     #[structopt(short, long, parse(from_os_str))]
@@ -43,7 +43,7 @@ async fn render(index_html_s: &str, url: &str, queries: HashMap<String, String>)
 async fn main() {
     env_logger::init();
 
-    let opts = Opt::from_args();
+    let opts = Opt::parse();
 
     let index_html_s = tokio::fs::read_to_string(opts.dir.join("index.html"))
         .await