bugfix and update readme

README.md

@@ -1,15 +1,19 @@
 brename
-===============
+=======
 
 Recursively batch rename files and directories by regular expression.
 
 通过正则表达式递归、批量重命名文件和文件夹。
 
 Install
 -------
+
+[**Recommanded**] To compile with the newest source code, please use [gobuild - Cross-Platform Go Project Compiler](http://gobuild.io/download/github.com/shenwei356/brename). It's simple and fast!
+
 This package is "go-gettable", just:
 
     go get github.com/shenwei356/brename
+    go install github.com/shenwei356/brename
 
 Usage
 -----
@@ -34,12 +38,7 @@ Example
 
     brename -s '([ab]+)' -r '$1$1'
 
-
-Have a Try
-----------
-You can compile by yourself or just download the executable files immediately.
-
 
-Copyright (c) 2013, Wei Shen ([email protected])
+Copyright (c) 2014, Wei Shen ([email protected])
 
 [MIT License](https://github.com/shenwei356/brename/blob/master/LICENSE)

brename.go

@@ -1,4 +1,4 @@
-// Copyright 2013 Wei Shen ([email protected]). All rights reserved.
+// Copyright 2014 Wei Shen ([email protected]). All rights reserved.
 // Use of this source code is governed by a MIT-license
 // that can be found in the LICENSE file.
 
@@ -46,9 +46,9 @@ Example:
 	}
 
 	flag.Parse()
-	if src == "" && repl == "" {
+	if src == "" || repl == "" {
 		flag.Usage()
-		os.Exit(2)
+		os.Exit(1)
 	}
 }