Locate all the FASTA files in the supplied sequence path. Create basic metadata objects for
    each sample

def strainer(sequencepath):
    """
    Locate all the FASTA files in the supplied sequence path. Create basic metadata objects for
    each sample
    """
    metadata_list = list()
    assert os.path.isdir(sequencepath), 'Cannot locate sequence path as specified: {}' \
        .format(sequencepath)
    # Get the sequences in the sequences folder into a list. Note that they must have a file extension that
    # begins with .fa
    strains = sorted(glob.glob(os.path.join(sequencepath, '*.fa*')))
    # Populate the metadata object. This object will be populated to mirror the objects created in the
    # genome assembly pipeline. This way this script will be able to be used as a stand-alone, or as part
    # of a pipeline
    assert strains, 'Could not find any files with an extension starting with "fa" in {}. Please check ' \
                    'to ensure that your sequence path is correct'.format(sequencepath)
    for sample in strains:
        # Create the object
        metadata = MetadataObject()
        # Set the base file name of the sequence. Just remove the file extension
        filename = os.path.splitext(os.path.split(sample)[1])[0]
        # Set the .name attribute to be the file name
        metadata.name = filename
        # Create the .general attribute
        metadata.general = GenObject()
        metadata.commands = GenObject()
        metadata.general.outputdirectory = os.path.join(sequencepath, filename)
        # Set the .general.bestassembly file to be the name and path of the sequence file
        metadata.general.bestassemblyfile = os.path.join(metadata.general.outputdirectory, '{sn}.fasta'
                                                         .format(sn=filename))
        make_path(metadata.general.outputdirectory)
        # Create a symlink to the directory
        relative_symlink(sample,
                         metadata.general.outputdirectory)
        metadata.general.logout = os.path.join(metadata.general.outputdirectory, 'out')
        metadata.general.logerr = os.path.join(metadata.general.outputdirectory, 'err')
        # Append the metadata for each sample to the list of samples
        metadata_list.append(metadata)
    return strains, metadata_list