refactor(logging): extract tracing infrastructure to its own module

src/logging.rs

@@ -0,0 +1,33 @@
+use tracing::dispatcher::SetGlobalDefaultError;
+use tracing::subscriber::set_global_default;
+use tracing::Level;
+use tracing_subscriber::filter::Targets;
+
+#[cfg(not(feature = "journald"))]
+fn configure_tracing(filter: Targets) -> Result<(), SetGlobalDefaultError> {
+  use tracing_subscriber::layer::SubscriberExt;
+  use tracing_subscriber::{fmt, Layer};
+
+  let stdout_log = fmt::layer().pretty();
+  let subscriber =
+    tracing_subscriber::registry().with(stdout_log.with_filter(filter));
+  set_global_default(subscriber)
+}
+
+#[cfg(feature = "journald")]
+fn configure_tracing(filter: Targets) -> Result<(), SetGlobalDefaultError> {
+  use tracing_journald::Layer;
+  use tracing_subscriber::layer::SubscriberExt;
+  use tracing_subscriber::registry;
+
+  let subscriber = registry()
+    .with(filter)
+    .with(Layer::new().unwrap().with_field_prefix(None));
+  set_global_default(subscriber)
+}
+
+pub fn init() -> Result<(), SetGlobalDefaultError> {
+  let tracing_filter =
+    Targets::new().with_target("clipboard_subsitutor", Level::DEBUG);
+  configure_tracing(tracing_filter)
+}