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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def enable(states):
    '''
    Enable state function or sls run

    CLI Example:

    .. code-block:: bash

        salt '*' state.enable highstate

        salt '*' state.enable test.succeed_without_changes

    .. note::
        To enable a state file from running provide the same name that would
        be passed in a state.sls call.

        salt '*' state.disable bind.config

    '''
    ret = {
        'res': True,
        'msg': ''
    }

    states = salt.utils.args.split_input(states)
    log.debug('states %s', states)

    msg = []
    _disabled = __salt__['grains.get']('state_runs_disabled')
    if not isinstance(_disabled, list):
        _disabled = []

    _changed = False
    for _state in states:
        log.debug('_state %s', _state)
        if _state not in _disabled:
            msg.append('Info: {0} state already enabled.'.format(_state))
        else:
            msg.append('Info: {0} state enabled.'.format(_state))
            _disabled.remove(_state)
            _changed = True

    if _changed:
        __salt__['grains.setval']('state_runs_disabled', _disabled)

    ret['msg'] = '\n'.join(msg)

    # refresh the grains
    __salt__['saltutil.refresh_modules']()

    return ret