_stream.py: Add the _classify_artifacts() helper

import tarfile

import tempfile

from contextlib import contextmanager, suppress

from fnmatch import fnmatch

from ._exceptions import StreamError, ImplError, BstError, set_last_task_error

from ._message import Message, MessageType

                required_list.append(element)

        return required_list

    # _classify_artifacts()

    #

    # Split up a list of tagets into element names and artifact refs

    #

    # Args:

    #    names (list): A list of targets

    #    cas (CASCache): The CASCache object

    #    project_directory (str): Absolute path to the project

    #

    # Returns:

    #    (list): element names present in the targets

    #    (list): artifact refs present in the targets

    #

    def _classify_artifacts(names, cas, project_directory):

        element_targets = []

        artifact_refs = []

        element_globs = []

        artifact_globs = []

        for name in names:

            if name.endswith('.bst'):

                if any(c in "*?[" for c in name):

                    element_globs.append(name)

                else:

                    element_targets.append(name)

            else:

                if any(c in "*?[" for c in name):

                    artifact_globs.append(name)

                else:

                    artifact_refs.append(name)

        if element_globs:

            for dirpath, _, filenames in os.walk(project_directory):

                for filename in filenames:

                    element_path = os.path.join(dirpath, filename).lstrip(project_directory).lstrip('/')

                    if any(fnmatch(element_path, glob) for glob in element_globs):

                        element_targets.append(element_path)

        if artifact_globs:

            artifact_refs.extend(ref for ref in cas.list_refs()

                                 if any(fnmatch(ref, glob) for glob in artifact_globs))

        return element_targets, artifact_refs