Use logging

src/main.rs

@@ -8,6 +8,8 @@ use app::Application;
 use clap::Parser;
 use emulator::EmulatorBuilder;
 use thread_priority::{ThreadBuilder, ThreadPriority};
+use tracing::error;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter, Layer};
 use winit::event_loop::{ControlFlow, EventLoop};
 
 mod app;
@@ -29,6 +31,13 @@ struct Args {
     debug_port: Option<u16>,
 }
 
+fn init_logger() {
+    let directives = std::env::var("RUST_LOG").unwrap_or("error,lemur=info".into());
+    let filter = EnvFilter::builder().parse_lossy(directives);
+    let layer = tracing_subscriber::fmt::layer().with_filter(filter);
+    tracing_subscriber::registry().with(layer).init();
+}
+
 fn set_panic_handler() {
     std::panic::set_hook(Box::new(|info| {
         let mut message = String::new();
@@ -76,6 +85,8 @@ fn set_process_priority_to_high() -> Result<()> {
 }
 
 fn main() -> Result<()> {
+    init_logger();
+
     set_panic_handler();
 
     #[cfg(windows)]
@@ -97,8 +108,8 @@ fn main() -> Result<()> {
         .spawn_careless(move || {
             let mut emulator = match builder.build() {
                 Ok(e) => e,
-                Err(err) => {
-                    eprintln!("Error initializing emulator: {err}");
+                Err(error) => {
+                    error!(%error, "Error initializing emulator");
                     process::exit(1);
                 }
             };