✨ feat: add new Option: MergeOptions support set the data merge optio…

…ns. see #166

config.go

@@ -111,23 +111,24 @@ type Config struct {
 	sMapCache map[string]strMap
 }
 
-// New config instance, default add JSON driver
+// New config instance with custom options, default with JSON driver
 func New(name string, opts ...OptionFn) *Config {
-	return NewEmpty(name).WithDriver(JSONDriver).WithOptions(opts...)
+	return NewEmpty(name, opts...).WithDriver(JSONDriver)
 }
 
-// NewEmpty config instance
-func NewEmpty(name string) *Config {
-	return &Config{
+// NewEmpty create config instance with custom options
+func NewEmpty(name string, opts ...OptionFn) *Config {
+	c := &Config{
 		name: name,
 		opts: newDefaultOption(),
 		data: make(map[string]any),
-
 		// don't add any drivers
 		encoders: map[string]Encoder{},
 		decoders: map[string]Decoder{},
 		aliasMap: make(map[string]string),
 	}
+
+	return c.WithOptions(opts...)
 }
 
 // NewWith create config instance, and you can call some init func

load.go

@@ -193,7 +193,7 @@ func LoadData(dataSource ...any) error { return dc.LoadData(dataSource...) }
 
 // LoadData load data from map OR struct
 //
-// The dataSources can be:
+// The dataSources type allow:
 //   - map[string]any
 //   - map[string]string
 func (c *Config) LoadData(dataSources ...any) (err error) {
@@ -209,7 +209,7 @@ func (c *Config) LoadData(dataSources ...any) (err error) {
 			continue
 		}
 
-		err = mergo.Merge(&c.data, ds, mergo.WithOverride)
+		err = mergo.Merge(&c.data, ds, c.opts.MergeOptions...)
 		if err != nil {
 			return errorx.WithStack(err)
 		}
@@ -480,7 +480,7 @@ func (c *Config) loadDataMap(data map[string]any) (err error) {
 		c.data = data
 	} else {
 		// again ... will merge data
-		err = mergo.Merge(&c.data, data, mergo.WithOverride, mergo.WithTypeCheck)
+		err = mergo.Merge(&c.data, data, c.opts.MergeOptions...)
 	}
 
 	if !c.reloading && err == nil {

options.go

@@ -3,6 +3,7 @@ package config
 import (
 	"strings"
 
+	"dario.cat/mergo"
 	"github.com/mitchellh/mapstructure"
 )
 
@@ -47,6 +48,8 @@ type Options struct {
 	DecoderConfig *mapstructure.DecoderConfig
 	// HookFunc on data changed. you can do something...
 	HookFunc HookFunc
+	// MergeOptions settings for merge two data
+	MergeOptions []func(*mergo.Config)
 	// WatchChange bool
 }
 
@@ -63,6 +66,10 @@ func newDefaultOption() *Options {
 		ReadFormat: JSON,
 		// struct decoder config
 		DecoderConfig: newDefaultDecoderConfig(""),
+		MergeOptions: []func(*mergo.Config){
+			mergo.WithOverride,
+			mergo.WithTypeCheck,
+		},
 	}
 }