Standardized: use recommend extension & forward compatibility before 1.0

config/config.go

@@ -87,11 +87,26 @@ type rawConfig struct {
 	Rule         []string                 `yaml:"Rule"`
 }
 
+// forward compatibility before 1.0
+func readRawConfig(path string) ([]byte, error) {
+	data, err := ioutil.ReadFile(path)
+	if err == nil && len(data) != 0 {
+		return data, nil
+	}
+
+	if filepath.Ext(path) != ".yaml" {
+		return nil, err
+	}
+
+	path = path[:len(path)-5] + ".yml"
+	return ioutil.ReadFile(path)
+}
+
 func readConfig(path string) (*rawConfig, error) {
 	if _, err := os.Stat(path); os.IsNotExist(err) {
 		return nil, err
 	}
-	data, err := ioutil.ReadFile(path)
+	data, err := readRawConfig(path)
 	if err != nil {
 		return nil, err
 	}