Exemple #1
0
func removeAlreadyAppliedTagValuePairs(store *storage.Storage, tx *storage.Tx, pairs []entities.TagIdValueIdPair, file *entities.File) ([]entities.TagIdValueIdPair, error) {
	log.Infof(2, "%v: determining existing file-tags", file.Path())

	existingFileTags, err := store.FileTagsByFileId(tx, file.Id, false)
	if err != nil {
		return nil, fmt.Errorf("%v: could not determine file's tags: %v", file.Path(), err)
	}

	log.Infof(2, "%v: determining implied tags", file.Path())

	newImplications, err := store.ImplicationsFor(tx, pairs...)
	if err != nil {
		return nil, fmt.Errorf("%v: could not determine implied tags: %v", file.Path(), err)
	}

	log.Infof(2, "%v: revising set of tags to apply", file.Path())

	revisedPairs := make([]entities.TagIdValueIdPair, 0, len(pairs))
	for _, pair := range pairs {
		predicate := func(ft entities.FileTag) bool {
			return ft.TagId == pair.TagId && ft.ValueId == pair.ValueId
		}

		if existingFileTags.Any(predicate) {
			continue
		}

		if newImplications.Implies(pair) {
			continue
		}

		revisedPairs = append(revisedPairs, pair)
	}

	return revisedPairs, nil
}