31 lines
858 B
JavaScript
31 lines
858 B
JavaScript
'use strict'
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var stringWidth = require('string-width')
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var stripAnsi = require('strip-ansi')
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module.exports = wideTruncate
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function wideTruncate (str, target) {
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if (stringWidth(str) === 0) {
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return str
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}
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if (target <= 0) {
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return ''
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}
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if (stringWidth(str) <= target) {
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return str
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}
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// We compute the number of bytes of ansi sequences here and add
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// that to our initial truncation to ensure that we don't slice one
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// that we want to keep in half.
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var noAnsi = stripAnsi(str)
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var ansiSize = str.length + noAnsi.length
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var truncated = str.slice(0, target + ansiSize)
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// we have to shrink the result to account for our ansi sequence buffer
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// (if an ansi sequence was truncated) and double width characters.
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while (stringWidth(truncated) > target) {
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truncated = truncated.slice(0, -1)
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}
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return truncated
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}
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