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)
+}

src/main.rs

@@ -1,11 +1,12 @@
 mod clipboard;
 mod config;
+mod logging;
 #[cfg(test)]
 mod test;
 
 use std::path::PathBuf;
 
-use anyhow::{anyhow, Result};
+use anyhow::{anyhow, bail, Result};
 use dirs::config_dir;
 use tracing::debug;
 
@@ -16,7 +17,9 @@ fn main() -> Result<()> {
   if check_for_version_arg() {
     return Ok(());
   }
-  configure_tracing();
+  if let Err(e) = logging::init() {
+    bail!(e)
+  };
   let config_path = get_config_path()?;
   let config_str =
     std::fs::read_to_string(config_path.as_path()).unwrap_or_default();
@@ -42,31 +45,6 @@ fn print_version() {
   );
 }
 
-#[cfg(not(feature = "journald"))]
-fn configure_tracing() {
-  use tracing::Level;
-  use tracing_subscriber::FmtSubscriber;
-
-  let subscriber = FmtSubscriber::builder()
-    .with_max_level(Level::TRACE)
-    .finish();
-
-  tracing::subscriber::set_global_default(subscriber)
-    .expect("setting default subscriber failed");
-}
-
-#[cfg(feature = "journald")]
-fn configure_tracing() {
-  use tracing_journald::Layer;
-  use tracing_subscriber::layer::SubscriberExt;
-  use tracing_subscriber::Registry;
-
-  let subscriber =
-    Registry::default().with(Layer::new().unwrap().with_field_prefix(None));
-  tracing::subscriber::set_global_default(subscriber)
-    .expect("setting default subscriber failed");
-}
-
 fn get_config_path() -> Result<PathBuf> {
   let mut config_path =
     config_dir().ok_or_else(|| anyhow!("Failed to get config dir"))?;