Only watch if 'watch' passed as argument

build_src/main.rs

@@ -45,21 +45,24 @@ fn build() {
 }
 
 fn main() {
-    println!("Watching...\n");
-
-    use notify::*;
-
-    let (tx, rx) = std::sync::mpsc::channel();
-
-    let mut watcher = watcher(tx, Duration::from_millis(100)).unwrap();
     build();
 
-    watcher.watch("./src", RecursiveMode::Recursive).unwrap();
+    if matches!(std::env::args().nth(1).as_deref(), Some("watch")) {
+        use notify::*;
 
-    loop {
-        match rx.recv() {
-            Ok(_) => build(),
-            Err(_) => break,
+        let (tx, rx) = std::sync::mpsc::channel();
+
+        let mut watcher = watcher(tx, Duration::from_millis(100)).unwrap();
+        watcher.watch("./src", RecursiveMode::Recursive).unwrap();
+
+        println!();
+        log_info("Watching…\n");
+
+        loop {
+            match rx.recv() {
+                Ok(_) => build(),
+                Err(_) => break,
+            }
         }
     }
 }