HORIZON PROJECT

module.exports = after

function after(count, callback, err_cb) {

    var bail = false

    err_cb = err_cb || noop

    proxy.count = count

    return (count === 0) ? callback() : proxy

    function proxy(err, result) {

        if (proxy.count <= 0) {

            throw new Error('after called too many times')

        }

        --proxy.count

        // after first error, rest are passed to err_cb

        if (err) {

            bail = true

            callback(err)

            // future error callbacks will go to error handler

            callback = err_cb

        } else if (proxy.count === 0 && !bail) {

            callback(null, result)

        }

    }

}

function noop() {}