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44 lines
1.1 KiB
JavaScript

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