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'use strict';
/**
* Determine what entries should be displayed on the screen, based on the
* currently selected index and the maximum visible. Used in list-based
* prompts like `select` and `multiselect`.
*
* @param {number} cursor the currently selected entry
* @param {number} total the total entries available to display
* @param {number} [maxVisible] the number of entries that can be displayed
*/
module.exports = (cursor, total, maxVisible) => {
maxVisible = maxVisible || total;
let startIndex = Math.min(total - maxVisible, cursor - Math.floor(maxVisible / 2));
if (startIndex < 0) startIndex = 0;
let endIndex = Math.min(startIndex + maxVisible, total);
return {
startIndex,
endIndex
};
};
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