Merge the colors into the X db so new terminals use them.

def xrdb(xrdb_files=None):
    """Merge the colors into the X db so new terminals use them."""
    xrdb_files = xrdb_files or \
        [os.path.join(CACHE_DIR, "colors.Xresources")]

    if shutil.which("xrdb") and OS != "Darwin":
        for file in xrdb_files:
            subprocess.run(["xrdb", "-merge", "-quiet", file])