digitalbiblesociety/dbp

module.exports = function (current, length, displayLength) {
    if (length <= 1) return []
    displayLength = displayLength - 2
    var indexes = [1]
    var start = Math.round(current - displayLength / 2)
    var end = Math.round(current + displayLength / 2)
    if (start <= 1) {
        start = 2
        end = start + displayLength - 1
        if (end >= length - 1) end = length - 1
    }
    if (end >= length - 1) {
        end = length - 1
        start = end - displayLength + 1
        if (start <= 1) start = 2
    }
    if (start !== 2) indexes.push('...')
    for (var i = start; i <= end; i++) {
        indexes.push(i)
    }
    if (end !== length - 1) indexes.push('...')
    indexes.push(length)
    return indexes
}