1 files changed, 64 insertions, 0 deletions
diff --git a/utils/toml/defaults.go b/utils/toml/defaults.go
new file mode 100644
index 0000000..e9ef032
--- /dev/null
+++ b/utils/toml/defaults.go
@@ -0,0 +1,64 @@
+package toml
+
+import (
+	"reflect"
+	"strconv"
+)
+
+func ApplyDefaults(target any) {
+	targetValue := reflect.ValueOf(target)
+
+	if targetValue.Kind() != reflect.Pointer || targetValue.Elem().Kind() != reflect.Struct {
+		return
+	}
+
+	applyStructDefaults(targetValue.Elem())
+}
+
+func applyStructDefaults(structValue reflect.Value) {
+	structType := structValue.Type()
+
+	for fieldIndex := range structType.NumField() {
+		fieldValue := structValue.Field(fieldIndex)
+		fieldDescriptor := structType.Field(fieldIndex)
+
+		if !fieldValue.CanSet() {
+			continue
+		}
+
+		if fieldValue.Kind() == reflect.Struct {
+			applyStructDefaults(fieldValue)
+			continue
+		}
+
+		defaultValue := fieldDescriptor.Tag.Get("default")
+		if defaultValue == "" {
+			continue
+		}
+
+		setDefaultValue(fieldValue, defaultValue)
+	}
+}
+
+func setDefaultValue(field reflect.Value, defaultValue string) {
+	if !isZeroValue(field) {
+		return
+	}
+
+	switch field.Kind() {
+	case reflect.String:
+		field.SetString(defaultValue)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		if parsed, parseError := strconv.ParseInt(defaultValue, 10, 64); parseError == nil {
+			field.SetInt(parsed)
+		}
+	case reflect.Bool:
+		if parsed, parseError := strconv.ParseBool(defaultValue); parseError == nil {
+			field.SetBool(parsed)
+		}
+	}
+}
+
+func isZeroValue(field reflect.Value) bool {
+	return field.IsZero()
+}