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- function incrementListIndex(current, dir, opt) {
- var len = opt.choices.realLength;
- var shouldLoop = 'loop' in opt ? Boolean(opt.loop) : true;
- if (dir === 'up') {
- if (current > 0) {
- return current - 1;
- }
- return shouldLoop ? len - 1 : current;
- }
- if (dir === 'down') {
- if (current < len - 1) {
- return current + 1;
- }
- return shouldLoop ? 0 : current;
- }
- throw new Error('dir must be up or down');
- }
- module.exports = incrementListIndex;
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