only build checksums, if in watch mode

cmd/muskel/converter.go

@@ -250,13 +250,15 @@ func (c *converter) prepare(dir, file string) error {
 		}
 	}
 
-	newChecksum := fileCheckSum(filep)
+	if ARGS.Watch.Get() {
+		newChecksum := fileCheckSum(filep)
 
-	if newChecksum == c.checksums[filep] {
-		return nil
-	}
+		if newChecksum == c.checksums[filep] {
+			return nil
+		}
 
-	c.checksums[filep] = newChecksum
+		c.checksums[filep] = newChecksum
+	}
 
 	if ARGS.WatchDir.Get() {
 		if filep != c.inFilep && c.Config.Fmt {