Do not call init_logger from inside watch.

And move init_logger to main.rs for future use.

src/main.rs

@@ -1,3 +1,5 @@
+use std::io::Write;
+
 extern crate watchexec;
 
 use watchexec::{cli, error, run};
@@ -5,3 +7,17 @@ use watchexec::{cli, error, run};
 fn main() -> error::Result<()> {
     run(cli::get_args()?)
 }
+
+fn init_logger(debug: bool) {
+    let mut log_builder = env_logger::Builder::new();
+    let level = if debug {
+        log::LevelFilter::Debug
+    } else {
+        log::LevelFilter::Warn
+    };
+
+    log_builder
+        .format(|buf, r| writeln!(buf, "*** {}", r.args()))
+        .filter(None, level)
+        .init();
+}

src/run.rs

@@ -10,7 +10,6 @@ use crate::watcher::{Event, Watcher};
 use std::{
     collections::HashMap,
     fs::canonicalize,
-    io::Write,
     sync::{
         mpsc::{channel, Receiver},
         Arc, RwLock,
@@ -18,20 +17,6 @@ use std::{
     time::Duration,
 };
 
-fn init_logger(debug: bool) {
-    let mut log_builder = env_logger::Builder::new();
-    let level = if debug {
-        log::LevelFilter::Debug
-    } else {
-        log::LevelFilter::Warn
-    };
-
-    log_builder
-        .format(|buf, r| writeln!(buf, "*** {}", r.args()))
-        .filter(None, level)
-        .init();
-}
-
 pub trait Handler {
     /// Called through a manual request, such as an initial run.
     ///
@@ -76,7 +61,6 @@ where
     H: Handler,
 {
     let args = handler.args();
-    init_logger(args.debug);
 
     let mut paths = vec![];
     for path in &args.paths {