List configured exports

    CLI Example:

    .. code-block:: bash

        salt '*' nfs.list_exports

def list_exports(exports='/etc/exports'):
    '''
    List configured exports

    CLI Example:

    .. code-block:: bash

        salt '*' nfs.list_exports
    '''
    ret = {}
    with salt.utils.files.fopen(exports, 'r') as efl:
        for line in salt.utils.stringutils.to_unicode(efl.read()).splitlines():
            if not line:
                continue
            if line.startswith('#'):
                continue
            comps = line.split()

            # Handle the case where the same path is given twice
            if not comps[0] in ret:
                ret[comps[0]] = []

            newshares = []
            for perm in comps[1:]:
                if perm.startswith('/'):
                    newshares.append(perm)
                    continue
                permcomps = perm.split('(')
                permcomps[1] = permcomps[1].replace(')', '')
                hosts = permcomps[0]
                if not isinstance(hosts, six.string_types):
                    # Lists, etc would silently mangle /etc/exports
                    raise TypeError('hosts argument must be a string')
                options = permcomps[1].split(',')
                ret[comps[0]].append({'hosts': hosts, 'options': options})
            for share in newshares:
                ret[share] = ret[comps[0]]
    return ret