refacto: extract livereload layer setup into a function

Co-authored-by: kosssi <github@fafaru.com>

crates/app/src/main.rs

@@ -1,16 +1,47 @@
 use ::app::get_router;
+use axum::body::Body;
 use axum::http::Request;
 use listenfd::ListenFd;
 use notify::Watcher;
+use tower_livereload::predicate::Predicate;
 use std::env;
 use std::path::Path;
 use tokio::net::TcpListener;
 use tower_livereload::LiveReloadLayer;
 
-// Nous filtrons les requêtes de `htmx` pour ne pas inclure le script _JS_ qui gère le rechargement
-// Voir https://github.com/leotaku/tower-livereload/pull/3
-fn not_htmx_predicate<T>(req: &Request<T>) -> bool {
-    !req.headers().contains_key("hx-request")
+/// Nous filtrons les requêtes de `htmx` pour ne pas inclure le script _JS_ qui gère le rechargement
+/// Voir https://github.com/leotaku/tower-livereload/pull/3
+#[derive(Copy, Clone)]
+struct NotHtmxPredicate;
+impl<T> Predicate<Request<T>> for NotHtmxPredicate {
+    fn check(&mut self, req: &Request<T>) -> bool {
+        !(req.headers().contains_key("hx-request"))
+    }
+}
+
+const DEFAULT_LISTENER: &str = "localhost:3000";
+async fn get_tcp_listener() -> TcpListener {
+    let mut listenfd = ListenFd::from_env();
+
+    match listenfd.take_tcp_listener(0).unwrap() {
+        // if we are given a tcp listener on listen fd 0, we use that one
+        Some(listener) => {
+            listener.set_nonblocking(true).unwrap();
+            TcpListener::from_std(listener).unwrap()
+        }
+        // otherwise fall back to local listening
+        None => TcpListener::bind(DEFAULT_LISTENER).await.unwrap(),
+    }
+}
+
+fn get_livereload_layer(templates_path: &Path) -> LiveReloadLayer<NotHtmxPredicate> {
+    let livereload = LiveReloadLayer::new();
+    let reloader = livereload.reloader();
+    let mut watcher = notify::recommended_watcher(move |_| reloader.reload()).unwrap();
+    watcher
+    .watch(templates_path, notify::RecursiveMode::Recursive)
+    .unwrap();
+    livereload.request_predicate::<Body, NotHtmxPredicate>(NotHtmxPredicate)
 }
 
 #[tokio::main]
@@ -19,28 +50,10 @@ async fn main() {
     let assets_path = Path::new(&manifest_dir).join("assets");
     let templates_path = Path::new(&manifest_dir).join("templates");
 
-    let livereload = LiveReloadLayer::new();
-    let reloader = livereload.reloader();
-
-    let router =
-        get_router(assets_path.as_path()).layer(livereload.request_predicate(not_htmx_predicate));
-
-    let mut watcher = notify::recommended_watcher(move |_| reloader.reload()).unwrap();
-    watcher
-        .watch(&templates_path, notify::RecursiveMode::Recursive)
-        .unwrap();
-
-    let mut listenfd = ListenFd::from_env();
-    let listener = match listenfd.take_tcp_listener(0).unwrap() {
-        // if we are given a tcp listener on listen fd 0, we use that one
-        Some(listener) => {
-            listener.set_nonblocking(true).unwrap();
-            TcpListener::from_std(listener).unwrap()
-        }
-        // otherwise fall back to local listening
-        None => TcpListener::bind("localhost:3000").await.unwrap(),
-    };
+    let livereload_layer = get_livereload_layer(&templates_path);
+    let router = get_router(assets_path.as_path()).layer(livereload_layer);
 
+    let listener: TcpListener = get_tcp_listener().await;
     println!("Listening on: http://{}", listener.local_addr().unwrap());
 
     // Run the server with the router