make args simply

src/args.rs

@@ -1,17 +1,14 @@
+use std::path::PathBuf;
+
 use clap::Parser;
+use clap::ValueHint;
 
 #[derive(Parser, Debug)]
 #[clap(author, version, about, long_about = None)]
 pub struct Args {
-    #[clap(short, long, value_parser)]
-    pub mode: String,
-
-    #[clap(short, long, value_parser)]
-    pub file: Option<String>,
-
-    #[clap(short, long, value_parser)]
-    pub ip: Option<String>,
-
     #[clap(short, long, value_parser)]
     pub port: Option<u16>,
+
+    #[clap(name = "FILE", value_hint = ValueHint::AnyPath)]
+    pub file: Option<PathBuf>,
 }

src/main.rs

@@ -16,15 +16,9 @@ fn main() {
     env_logger::init();
     let args = Args::parse();
 
-    match &*args.mode {
-        "server" => {
+    if let Some(_) = args.port {
         start_server(args);
-        }
-        "client" => {
+    } else {
         start_client(args);
     }
-        _ => {
-            println!("Unknown mode");
-        }
-    }
 }