Add config export

custom/custom.go

@@ -80,6 +80,35 @@ func changeConfigOptions(configOptionsJson *C.char) (CErr *C.char) {
 	return C.CString("")
 }
 
+//export generateConfig
+func generateConfig(path *C.char) (res *C.char) {
+	defer shared.DeferPanicToError("generateConfig", func(err error) {
+		res = C.CString("error" + err.Error())
+	})
+
+	config, err := generateConfigFromFile(C.GoString(path), *configOptions)
+	if err != nil {
+		return C.CString("error" + err.Error())
+	}
+	return C.CString(config)
+}
+
+func generateConfigFromFile(path string, configOpt shared.ConfigOptions) (string, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return "", err
+	}
+	options, err := parseConfig(string(content))
+	if err != nil {
+		return "", err
+	}
+	config, err := shared.BuildConfigJson(configOpt, options)
+	if err != nil {
+		return "", err
+	}
+	return config, nil
+}
+
 //export start
 func start(configPath *C.char, disableMemoryLimit bool) (CErr *C.char) {
 	defer shared.DeferPanicToError("start", func(err error) {

mobile/mobile.go

@@ -28,7 +28,5 @@ func BuildConfig(path string, configOptionsJson string) (string, error) {
 	if err != nil {
 		return "", nil
 	}
-	options = shared.BuildConfig(*configOptions, options)
-	config, err := json.Marshal(options)
-	return string(config), err
+	return shared.BuildConfigJson(*configOptions, options)
 }

shared/config.go

@@ -1,6 +1,7 @@
 package shared
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"net"
@@ -38,6 +39,19 @@ type ConfigOptions struct {
 	Rules                   []Rule                `json:"rules"`
 }
 
+func BuildConfigJson(configOpt ConfigOptions, input option.Options) (string, error) {
+	options := BuildConfig(configOpt, input)
+	var buffer bytes.Buffer
+	json.NewEncoder(&buffer)
+	encoder := json.NewEncoder(&buffer)
+	encoder.SetIndent("", "  ")
+	err := encoder.Encode(options)
+	if err != nil {
+		return "", err
+	}
+	return buffer.String(), nil
+}
+
 // TODO include selectors
 func BuildConfig(configOpt ConfigOptions, input option.Options) option.Options {
 	if configOpt.ExecuteAsIs {