func (command DeleteCommand) deleteTag(store *storage.Storage, tagName string) error {
tag, err := store.TagByName(tagName)
if err != nil {
return fmt.Errorf("could not retrieve tag '%v': %v", tagName, err)
}
if tag == nil {
return fmt.Errorf("no such tag '%v'.", tagName)
}
if command.verbose {
log.Infof("finding files tagged '%v'.", tagName)
}
fileTags, err := store.FileTagsByTagId(tag.Id)
if err != nil {
return fmt.Errorf("could not retrieve taggings for tag '%v': %v", tagName, err)
}
if command.verbose {
log.Infof("removing applications of tag '%v'.", tagName)
}
err = store.RemoveFileTagsByTagId(tag.Id)
if err != nil {
return fmt.Errorf("could not remove taggings for tag '%v': %v", tagName, err)
}
if command.verbose {
log.Infof("removing tags implications involving tag '%v'.", tagName)
}
err = store.RemoveImplicationsForTagId(tag.Id)
if err != nil {
return fmt.Errorf("could not remove tag implications involving tag '%v': %v", tagName, err)
}
if command.verbose {
log.Infof("deleting tag '%v'.", tagName)
}
err = store.DeleteTag(tag.Id)
if err != nil {
return fmt.Errorf("could not delete tag '%v': %v", tagName, err)
}
if command.verbose {
log.Infof("identifying files left untagged as a result of tag deletion.")
}
removedFileCount := 0
for _, fileTag := range fileTags {
count, err := store.FileTagCountByFileId(fileTag.FileId)
if err != nil {
return fmt.Errorf("could not retrieve taggings count for file #%v: %v", fileTag.FileId, err)
}
if count == 0 {
err := store.RemoveFile(fileTag.FileId)
if err != nil {
return fmt.Errorf("could not remove file #%v: %v", fileTag.FileId, err)
}
removedFileCount += 1
}
}
if command.verbose {
log.Infof("removed %v untagged files.", removedFileCount)
}
return nil
}