arg parsing works

src/main.rs

@@ -170,7 +170,9 @@ async fn normal(cfg: config::Config) -> eyre::Result<()>
 
 async fn parse_mode() -> eyre::Result<()>
 {
-    match arg::parse_args().wrap_err(eyre!("Failed to parse args"))?
+    match arg::parse_args()
+	.wrap_err(eyre!("Failed to parse args"))
+        .with_suggestion(|| "Try `--help`")?
     {
 	arg::Mode::Normal(cfg) => {
 	    #[cfg(debug_assertions)] eprintln!("cfg: {:#?}", cfg);