Adjust display of errors and exit notify

cli/src/config/init.rs

@@ -1,11 +1,27 @@
-use std::io::stderr;
+use std::convert::Infallible;
 
 use clap::ArgMatches;
 use miette::Result;
-use watchexec::{config::InitConfig, handler::PrintDisplay};
+use tracing::error;
+use watchexec::{config::InitConfig, handler::SyncFnHandler, error::RuntimeError};
 
 pub fn init(_args: &ArgMatches<'static>) -> Result<InitConfig> {
 	let mut config = InitConfig::default();
-	config.on_error(PrintDisplay(stderr()));
+	config.on_error(SyncFnHandler::from(|data| -> std::result::Result<(), Infallible> {
+		if let RuntimeError::IoError(_) = data {
+			// these are often spurious, so condemn them to -v only
+			error!("{}", data);
+			return Ok(());
+		}
+
+		if cfg!(debug_assertions) {
+			eprintln!("[[{:?}]]", data);
+		} else {
+			eprintln!("[[{}]]", data);
+		}
+
+		Ok(())
+	}));
+
 	Ok(config)
 }

cli/src/config/runtime.rs

@@ -154,7 +154,7 @@ pub fn runtime(args: &ArgMatches<'static>) -> Result<RuntimeConfig> {
 				};
 
 				if printit {
-					eprintln!("{}", msg);
+					eprintln!("[[{}]]", msg);
 				}
 
 				if notif {
@@ -164,7 +164,7 @@ pub fn runtime(args: &ArgMatches<'static>) -> Result<RuntimeConfig> {
 						.show()
 						.map(drop)
 						.unwrap_or_else(|err| {
-							eprintln!("Failed to send desktop notification: {}", err);
+							eprintln!("[[Failed to send desktop notification: {}]]", err);
 						});
 				}
 
@@ -218,7 +218,7 @@ pub fn runtime(args: &ArgMatches<'static>) -> Result<RuntimeConfig> {
 				.show()
 				.map(drop)
 				.unwrap_or_else(|err| {
-					eprintln!("Failed to send desktop notification: {}", err);
+					eprintln!("[[Failed to send desktop notification: {}]]", err);
 				});
 		}