if installed, use wasabi to create abundance.h5 output for use with
    sleuth

def sleuthify_sailfish(sailfish_dir):
    """
    if installed, use wasabi to create abundance.h5 output for use with
    sleuth
    """
    if not R_package_path("wasabi"):
        return None
    else:
        rscript = Rscript_cmd()
        cmd = """{rscript} --no-environ -e 'library("wasabi"); prepare_fish_for_sleuth(c("{sailfish_dir}"))'"""
        do.run(cmd.format(**locals()), "Converting Sailfish to Sleuth format.")
    return os.path.join(sailfish_dir, "abundance.h5")