Setting: useEmptyOnNil

useEmptyOnNil [yes,no], useEmptyOnNil:slice [yes,no] and useEmptyOnNil:map [yes,no] are boolean settings and can be defined as CLI argument, conversion comment or method comment. These settings are inheritable.

By default, goverter converts a nil slice/map to nil.

• Set useEmptyOnNil to enable both of the settings below.
• Set useEmptyOnNil:map to convert nil maps to empty maps (map[K]V{}).
• Set useEmptyOnNil:slice to convert nil slices to empty slices ([]T{}).

input.go

package emptyonnil

// goverter:converter
// goverter:useEmptyOnNil
type Converter interface {
	ConvertSlice(source []string) []string
	ConvertMap(source map[string]string) map[string]string
}

// goverter:converter
type StrictConverter interface {
	ConvertSlice(source []string) []string
	ConvertMap(source map[string]string) map[string]string
}

generated/generated.go

// Code generated by github.com/jmattheis/goverter, DO NOT EDIT.
//go:build !goverter

package generated

type ConverterImpl struct{}

func (c *ConverterImpl) ConvertMap(source map[string]string) map[string]string {
	var mapStringString map[string]string
	mapStringString = make(map[string]string, len(source))
	for key, value := range source {
		mapStringString[key] = value
	}
	return mapStringString
}
func (c *ConverterImpl) ConvertSlice(source []string) []string {
	var stringList []string
	stringList = make([]string, len(source))
	for i := 0; i < len(source); i++ {
		stringList[i] = source[i]
	}
	return stringList
}

type StrictConverterImpl struct{}

func (c *StrictConverterImpl) ConvertMap(source map[string]string) map[string]string {
	var mapStringString map[string]string
	if source != nil {
		mapStringString = make(map[string]string, len(source))
		for key, value := range source {
			mapStringString[key] = value
		}
	}
	return mapStringString
}
func (c *StrictConverterImpl) ConvertSlice(source []string) []string {
	var stringList []string
	if source != nil {
		stringList = make([]string, len(source))
		for i := 0; i < len(source); i++ {
			stringList[i] = source[i]
		}
	}
	return stringList
}