func mergeTags(store *storage.Storage, tx *storage.Tx, sourceTagNames []string, destTagName string) (error, warnings) {
destTag, err := store.TagByName(tx, destTagName)
if err != nil {
return fmt.Errorf("could not retrieve tag '%v': %v", destTagName, err), nil
}
if destTag == nil {
return fmt.Errorf("no such tag '%v'", destTagName), nil
}
warnings := make(warnings, 0, 10)
for _, sourceTagName := range sourceTagNames {
if sourceTagName == destTagName {
warnings = append(warnings, fmt.Sprintf("cannot merge tag '%v' into itself", sourceTagName))
continue
}
sourceTag, err := store.TagByName(tx, sourceTagName)
if err != nil {
return fmt.Errorf("could not retrieve tag '%v': %v", sourceTagName, err), warnings
}
if sourceTag == nil {
warnings = append(warnings, fmt.Sprintf("no such tag '%v'", sourceTagName))
continue
}
log.Infof(2, "finding files tagged '%v'.", sourceTagName)
fileTags, err := store.FileTagsByTagId(tx, sourceTag.Id, true)
if err != nil {
return fmt.Errorf("could not retrieve files for tag '%v': %v", sourceTagName, err), warnings
}
log.Infof(2, "applying tag '%v' to these files.", destTagName)
for _, fileTag := range fileTags {
if _, err = store.AddFileTag(tx, fileTag.FileId, destTag.Id, fileTag.ValueId); err != nil {
return fmt.Errorf("could not apply tag '%v' to file #%v: %v", destTagName, fileTag.FileId, err), warnings
}
}
log.Infof(2, "deleting tag '%v'.", sourceTagName)
if err = store.DeleteTag(tx, sourceTag.Id); err != nil {
return fmt.Errorf("could not delete tag '%v': %v", sourceTagName, err), warnings
}
}
return nil, warnings
}
