# OS shell command escaping
#
def quote(ins):
    if type(ins) is list:
        return " ".join([quote(s) for s in ins])
    # Windows: double quotes / caret escaping
    elif conf.windows:
        if re.search(r"""[()<>&%!^'";\s]""", ins):
        if re.search(r"""[()<>&!^'";\s]""", ins):
            ins = '"%s"' % ins
            ins = re.sub(r'([()<>"&%^])', r"^\1", ins)
            ins = re.sub(r'([()<>"&^])', r"^\1", ins)
            return ins
        else:
            return subprocess.list2cmdline([ins])
    # Posix-style shell quoting
    else:
        if re.match("^\w[\w.:/\-]+$", ins):
            return ins