Print nicer error messages

src/main.rs

@@ -1,7 +1,9 @@
 use clap::Parser;
 use mimalloc::MiMalloc;
 use owo_colors::OwoColorize;
-use std::{backtrace::Backtrace, fmt::Display, net::SocketAddr, num::NonZero, panic, thread};
+use std::{
+    backtrace::Backtrace, fmt::Display, net::SocketAddr, num::NonZero, panic, process, thread,
+};
 use sysexits::ExitCode;
 
 #[global_allocator]
@@ -20,21 +22,23 @@ fn panic_cb(panic: &panic::PanicHookInfo) {
     };
 
     eprint!(
-        "{}:\n{trace}",
+        "{}\n{trace}",
         format_args!(
             "thread '{}' panicked at {location}: {msg}",
             thread::current().name().unwrap_or("<unnamed>")
         )
         .red()
+        .bold()
     );
 
     eprintln!(
         "{}",
         format_args!(
-            "This is a bug in luby. Please kindly report this at {}.",
+            "luby should never panic. Please kindly report this bug at {}.",
             env!("CARGO_PKG_REPOSITORY")
         )
         .yellow()
+        .bold()
     );
 }
 
@@ -110,17 +114,17 @@ impl Args {
 
 fn exit_err<T, E: Display>(code: ExitCode) -> impl FnOnce(E) -> T {
     move |err| {
-        eprintln!("{}", err.red());
+        eprintln!("{}", err.red().bold());
         code.exit()
     }
 }
 
-fn main() -> Result<(), ExitCode> {
+fn main() {
     panic::set_hook(Box::new(panic_cb));
 
     let args = Args::parse();
     if args.version {
-        return Ok(print_version());
+        return print_version();
     }
 
     init_logger(&args);
@@ -232,13 +236,13 @@ fn parse_jitlib_cmd(s: &str) -> Option<(&str, &str)> {
     }
 }
 
-async fn main_async(args: Args, state: &mut luajit::State) -> Result<(), ExitCode> {
+async fn main_async(args: Args, state: &mut luajit::State) {
     for ref path in args.path {
         let mut s = state.guard();
         let chunk = match std::fs::read(path) {
             Ok(chunk) => chunk,
             Err(err) => {
-                eprintln!("{}", format_args!("{path}: {err}").red());
+                eprintln!("{}", format_args!("{path}: {err}").red().bold());
                 ExitCode::NoInput.exit();
             }
         };
@@ -248,13 +252,11 @@ async fn main_async(args: Args, state: &mut luajit::State) -> Result<(), ExitCod
 
         if let Err(err) = s.call_async(0, 0).await {
             match err.trace() {
-                Some(trace) => eprintln!("{}\n{trace}", err.red()), // runtime error
+                Some(trace) => eprintln!("{}\n{trace}", err.red().bold()),
-                None => eprintln!("{}", err.red()),
+                None => eprintln!("{}", err.red().bold()),
             }
 
-            ExitCode::DataErr.exit();
+            process::exit(1);
         }
     }
-
-    Ok(())
 }