feat(dig): accepts string with dot or arrays as "path" parameters about sprig HOT 1 OPEN

func FuncMap() ttemplate.FuncMap {
	f := sprig.TxtFuncMap()
	f["getNested"] = getNested
	return f
}

func getNested(d map[string]interface{}, key string) interface{} {
	t := strings.Split(key, ".")
	for i := 0; i < len(t); i++ {
		if val, ok := d[t[i]]; ok {
			if i+1 == len(t) {
				return val
			} else {
				d = castAndGetMapStringInterface(val)
			}
		}
	}
	panic(fmt.Errorf("the map does not have a match for key %s", key))
}

func castAndGetMapStringInterface(i interface{}) map[string]interface{} {
	m, ok := i.(map[string]interface{})
	if ok {
		return m
	}
	return nil
}

{{getNested .ImageMap "ingress-controller.registry"}}

type InterpolateContext struct {
	ImageMap map[string]interface{}
}