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
}