def convert_adatpers(adapter_fasta):
    """Generates an adapter file for FastQC from a fasta file.

    The provided adapters file is assumed to be a simple fasta file with the
    adapter's name as header and the corresponding sequence::

        >TruSeq_Universal_Adapter
        AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
        >TruSeq_Adapter_Index 1
        GATCGGAAGAGCACACGTCTGAACTCCAGTCACATCACGATCTCGTATGCCGTCTTCTGCTTG

    Parameters
    ----------
    adapter_fasta : str
        Path to Fasta file with adapter sequences.

    Returns
    -------
    adapter_out : str or None
        The path to the reformatted adapter file. Returns ``None`` if the
        adapters file does not exist or the path is incorrect.
    """

    adapter_out = "fastqc_adapters.tab"
    logger.debug("Setting output adapters file to: {}".format(adapter_out))

    try:

        with open(adapter_fasta) as fh, \
                open(adapter_out, "w") as adap_fh:

            for line in fh:
                if line.startswith(">"):

                    head = line[1:].strip()
                    # Get the next line with the sequence string
                    sequence = next(fh).strip()

                    adap_fh.write("{}\\t{}\\n".format(head, sequence))

        logger.info("Converted adapters file")

        return adapter_out

    # If an invalid adapters file is provided, return None.
    except FileNotFoundError:
        logger.warning("Could not find the provided adapters file: {}".format(
            adapter_fasta))
        return
Generates an adapter file for FastQC from a fasta file.

    The provided adapters file is assumed to be a simple fasta file with the
    adapter's name as header and the corresponding sequence::

        >TruSeq_Universal_Adapter
        AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
        >TruSeq_Adapter_Index 1
        GATCGGAAGAGCACACGTCTGAACTCCAGTCACATCACGATCTCGTATGCCGTCTTCTGCTTG

    Parameters
    ----------
    adapter_fasta : str
        Path to Fasta file with adapter sequences.

    Returns
    -------
    adapter_out : str or None
        The path to the reformatted adapter file. Returns ``None`` if the
        adapters file does not exist or the path is incorrect.