feat(logs): Add tracing logs

Cargo.toml

@@ -12,7 +12,7 @@ cosmic-config = { git = "https://github.com/pop-os/libcosmic" }
 
 [dependencies]
 cosmic-settings-subscriptions = { git = "https://github.com/pop-os/cosmic-settings-subscriptions", features = [
-    "pulse",
+  "pulse",
 ] }
 anyhow = "1.0.97"
 clap = "4.5.32"
@@ -25,7 +25,7 @@ zbus = { version = "5.7.1", default-features = false, features = ["tokio"] }
 tokio-stream = "0.1.17"
 sunrise = "2.1.0"
 cosmic-theme = { git = "https://github.com/pop-os/libcosmic", features = [
-    "export",
+  "export",
 ] }
 cosmic-config.workspace = true
 cosmic-comp-config = { git = "https://github.com/pop-os/cosmic-comp" }
@@ -42,6 +42,16 @@ futures = "0.3.31"
 ctrlc = { version = "3.4.5", features = ["termination"] }
 xkb-data = "0.2.1"
 geonames = { path = "geonames" }
+tracing = "0.1.41"
+tracing-journald = "0.3.1"
+tracing-subscriber = { version = "0.3.19", default-features = false, features = [
+  "std",
+  "env-filter",
+  "registry",
+  "fmt",
+  "env-filter",
+  "ansi",
+] }
 
 [patch.crates-io]
 smithay-client-toolkit = { git = "https://github.com/smithay/client-toolkit" }

src/main.rs

@@ -19,6 +19,7 @@ use tokio::{
     task,
 };
 use tokio_stream::StreamExt;
+use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 use zbus::{
     names::{MemberName, UniqueName, WellKnownName},
     object_server::SignalEmitter,
@@ -355,6 +356,7 @@ pub enum Change {
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() -> zbus::Result<()> {
+    init_logger();
     let (theme_cleanup_done_tx, mut theme_cleanup_done_rx) = tokio::sync::mpsc::channel(1);
     let (sigterm_tx, sigterm_rx) = tokio::sync::broadcast::channel(1);
 
@@ -750,3 +752,21 @@ async fn watch_config_message_stream(
 
     Ok(())
 }
+
+fn init_logger() {
+    let fmt_layer = fmt::layer().with_target(false);
+    let filter_layer = EnvFilter::try_from_default_env()
+        .or_else(|_| EnvFilter::try_new("warn"))
+        .unwrap();
+    if let Ok(journal_layer) = tracing_journald::layer() {
+        tracing_subscriber::registry()
+            .with(journal_layer)
+            .with(filter_layer)
+            .init();
+    } else {
+        tracing_subscriber::registry()
+            .with(fmt_layer)
+            .with(filter_layer)
+            .init();
+    }
+}