feat: show power by

option.go

@@ -33,6 +33,7 @@ xconf : https://github.com/sandwich-go/xconf
 optiongen: https://github.com/timestee/optiongen
 xconf-providers: https://github.com/sandwich-go/xconf-providers
 `
+var powerBy = `Powered by: https://github.com/sandwich-go/xconf`
 
 // OptionsOptionDeclareWithDefault go-lint
 //go:generate optiongen --option_with_struct_name=false --xconf=true --usage_tag_name=usage
@@ -85,6 +86,8 @@ func OptionsOptionDeclareWithDefault() interface{} {
 		"ParseMetaKeyFlagFiles": true,
 		// annotation@EnvironPrefix(comment="绑定ENV前缀，防止ENV名称覆盖污染")
 		"EnvironPrefix": "",
+		// annotation@OptionUsagePoweredBy(comment="--help中显示Power by")
+		"OptionUsagePoweredBy": string(powerBy),
 		// annotation@StringAlias(comment="值别名")
 		"StringAlias": (map[string]string)(map[string]string{
 			"math.MaxInt":    strconv.Itoa(maxInt),

tests/main/main.go

@@ -15,6 +15,7 @@ func main() {
 		xconf.WithFiles("c1.yaml"),
 		xconf.WithDebug(false),
 		xconf.WithEnvironPrefix("test_prefix_"),
+		xconf.WithOptionUsagePoweredBy(""),
 	)
 	if err := xx.Parse(cc); err != nil {
 		panic(err)

xconf.go

@@ -196,11 +196,17 @@ func (x *XConf) mergeMap(srcName string, dstName string, src map[string]interfac
 	return mergeMap("", 0, x.runningLogger, src, dst, x.isLeafFieldPath, nil, nil)
 }
 
-func getOptionUsage(valPtr interface{}) string {
+func (x *XConf) getOptionUsage(valPtr interface{}) (ret string) {
 	if w, ok := valPtr.(GetOptionUsage); ok {
-		return xutil.StringTrim(w.GetOptionUsage())
+		ret = xutil.StringTrim(w.GetOptionUsage())
 	}
-	return ""
+	if ret == "" {
+		return x.cc.OptionUsagePoweredBy
+	}
+	if x.cc.OptionUsagePoweredBy == "" {
+		return ret
+	}
+	return ret + "\n" + x.cc.OptionUsagePoweredBy
 }
 
 // Merge 合并配置
@@ -223,7 +229,7 @@ func (x *XConf) parse(valPtr interface{}) (err error) {
 		if reflect.ValueOf(valPtr).Kind() != reflect.Ptr {
 			return errors.New("unsupported type, pass in as ptr")
 		}
-		x.optionUsage = getOptionUsage(valPtr)
+		x.optionUsage = x.getOptionUsage(valPtr)
 
 		// 如果应用层配置实现了XConfOptions
 		applyXConfOptions(valPtr, x)