func mergeValues(store *storage.Storage, tx *storage.Tx, sourceValueNames []string, destValueName string) (error, warnings) {
destValue, err := store.ValueByName(tx, destValueName)
if err != nil {
return fmt.Errorf("could not retrieve value '%v': %v", destValueName, err), nil
}
if destValue == nil {
return fmt.Errorf("no such value '%v'", destValueName), nil
}
warnings := make(warnings, 0, 10)
for _, sourceValueName := range sourceValueNames {
if sourceValueName == destValueName {
warnings = append(warnings, fmt.Sprintf("cannot merge value '%v' into itself", sourceValueName))
continue
}
sourceValue, err := store.ValueByName(tx, sourceValueName)
if err != nil {
return fmt.Errorf("could not retrieve value '%v': %v", sourceValueName, err), warnings
}
if sourceValue == nil {
warnings = append(warnings, fmt.Sprintf("no such value '%v'", sourceValueName))
continue
}
log.Infof(2, "finding files tagged with value '%v'.", sourceValueName)
fileTags, err := store.FileTagsByValueId(tx, sourceValue.Id)
if err != nil {
return fmt.Errorf("could not retrieve files for value '%v': %v", sourceValueName, err), warnings
}
log.Infof(2, "applying value '%v' to these files.", destValueName)
for _, fileTag := range fileTags {
if _, err = store.AddFileTag(tx, fileTag.FileId, fileTag.TagId, destValue.Id); err != nil {
return fmt.Errorf("could not apply value '%v' to file #%v: %v", destValueName, fileTag.FileId, err), warnings
}
}
log.Infof(2, "deleting value '%v'.", sourceValueName)
if err = store.DeleteValue(tx, sourceValue.Id); err != nil {
return fmt.Errorf("could not delete value '%v': %v", sourceValueName, err), warnings
}
}
return nil, warnings
}
