HORIZON PROJECT

'use strict';

Object.defineProperty(exports, "__esModule", {

    value: true

});

exports.default = doDuring;

var _noop = require('lodash/noop');

var _noop2 = _interopRequireDefault(_noop);

var _rest = require('./internal/rest');

var _rest2 = _interopRequireDefault(_rest);

var _onlyOnce = require('./internal/onlyOnce');

var _onlyOnce2 = _interopRequireDefault(_onlyOnce);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**

 * The post-check version of [`during`]{@link module:ControlFlow.during}. To reflect the difference in

 * the order of operations, the arguments `test` and `fn` are switched.

 *

 * Also a version of [`doWhilst`]{@link module:ControlFlow.doWhilst} with asynchronous `test` function.

 * @name doDuring

 * @static

 * @memberOf module:ControlFlow

 * @method

 * @see [async.during]{@link module:ControlFlow.during}

 * @category Control Flow

 * @param {Function} fn - A function which is called each time `test` passes.

 * The function is passed a `callback(err)`, which must be called once it has

 * completed with an optional `err` argument. Invoked with (callback).

 * @param {Function} test - asynchronous truth test to perform before each

 * execution of `fn`. Invoked with (...args, callback), where `...args` are the

 * non-error args from the previous callback of `fn`.

 * @param {Function} [callback] - A callback which is called after the test

 * function has failed and repeated execution of `fn` has stopped. `callback`

 * will be passed an error if one occured, otherwise `null`.

 */

function doDuring(fn, test, callback) {

    callback = (0, _onlyOnce2.default)(callback || _noop2.default);

    var next = (0, _rest2.default)(function (err, args) {

        if (err) return callback(err);

        args.push(check);

        test.apply(this, args);

    });

    function check(err, truth) {

        if (err) return callback(err);

        if (!truth) return callback(null);

        fn(next);

    }

    check(null, true);

}

module.exports = exports['default'];