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