Function MergeMeta

pkg/waveobj/wtypemeta.go:184–224

returns a clean copy of meta with mergeMeta merged in if mergeSpecial is false, then special keys will not be merged (like display:*)

(meta MetaMapType, metaUpdate MetaMapType, mergeSpecial bool)

// returns a clean copy of meta with mergeMeta merged in
// if mergeSpecial is false, then special keys will not be merged (like display:*)
func MergeMeta(meta MetaMapType, metaUpdate MetaMapType, mergeSpecial bool) MetaMapType {
	rtn := make(MetaMapType)
	for k, v := range meta {
		rtn[k] = v
	}
	// deal with "section:*" keys
	for k := range metaUpdate {
		if !strings.HasSuffix(k, ":*") {
			continue
		}
		if !metaUpdate.GetBool(k, false) {
			continue
		}
		prefix := strings.TrimSuffix(k, ":*")
		if prefix == "" {
			continue
		}
		// delete "[prefix]" and all keys that start with "[prefix]:"
		prefixColon := prefix + ":"
		for k2 := range rtn {
			if k2 == prefix || strings.HasPrefix(k2, prefixColon) {
				delete(rtn, k2)
			}
		}
	}
	// now deal with regular keys
	for k, v := range metaUpdate {
		if !mergeSpecial && strings.HasPrefix(k, "display:") {
			continue
		}
		if strings.HasSuffix(k, ":*") {
			continue
		}
		if v == nil {
			delete(rtn, k)
			continue
		}
		rtn[k] = v
	}
	return rtn
}