[clippy] enable more lints, get rid of unwrap

Cargo.toml

@@ -3,6 +3,14 @@ name = "expose-dir-via-http"
 version = "1.0.0"
 edition = "2021"
 
+[lints.rust]
+unsafe_code = "forbid"
+
+[lints.clippy]
+pedantic = "warn"
+todo = "warn"
+unwrap_used = "warn"
+
 [dependencies]
 actix-web = { version = "4", features = ["experimental-io-uring"] }
 actix-files = "0.6"

src/main.rs

@@ -1,6 +1,6 @@
 use std::{
-    env,
     net::{IpAddr, SocketAddr},
+    num::NonZeroUsize,
     thread::available_parallelism,
 };
 
@@ -39,7 +39,7 @@ async fn main() -> std::io::Result<()> {
                 .prefer_utf8(true),
         )
     })
-    .workers(available_parallelism().unwrap().get())
+    .workers(available_parallelism().map_or(1, NonZeroUsize::get))
     .bind(sock)?
     .run()
     .await