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44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
6 years ago
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'use strict';
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var sliceAnsi = require('slice-ansi');
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var stringWidth = require('string-width');
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module.exports = function (input, columns, options) {
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options = options || {};
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var position = options.position || 'end';
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var ellipsis = '…';
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if (typeof input !== 'string') {
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throw new TypeError('Expected `input` to be a string, got ' + typeof input);
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}
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if (typeof columns !== 'number') {
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throw new TypeError('Expected `columns` to be a number, got ' + typeof columns);
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}
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if (columns < 1) {
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return '';
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}
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if (columns === 1) {
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return ellipsis;
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}
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var length = stringWidth(input);
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if (length <= columns) {
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return input;
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}
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if (position === 'start') {
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return ellipsis + sliceAnsi(input, length - columns + 1, length);
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} else if (position === 'middle') {
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var half = Math.floor(columns / 2);
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return sliceAnsi(input, 0, half) + ellipsis + sliceAnsi(input, length - (columns - half) + 1, length);
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} else if (position === 'end') {
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return sliceAnsi(input, 0, columns - 1) + ellipsis;
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}
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throw new Error('Expected `options.position` to be either `start`, `middle` or `end`, got ' + position);
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};
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