83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const arraySum = array => {
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let sum = 0;
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for (const item of array) sum += item;
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return sum;
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};
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/**
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* @param {any[]} args items to be truncated
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* @param {number} maxLength maximum length of args including spaces between
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* @returns {string[]} truncated args
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*/
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const truncateArgs = (args, maxLength) => {
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const lengths = args.map(a => `${a}`.length);
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const availableLength = maxLength - lengths.length + 1;
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if (availableLength > 0 && args.length === 1) {
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if (availableLength >= args[0].length) {
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return args;
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} else if (availableLength > 3) {
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return ["..." + args[0].slice(-availableLength + 3)];
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} else {
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return [args[0].slice(-availableLength)];
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}
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}
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// Check if there is space for at least 4 chars per arg
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if (availableLength < arraySum(lengths.map(i => Math.min(i, 6)))) {
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// remove args
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if (args.length > 1)
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return truncateArgs(args.slice(0, args.length - 1), maxLength);
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return [];
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}
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let currentLength = arraySum(lengths);
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// Check if all fits into maxLength
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if (currentLength <= availableLength) return args;
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// Try to remove chars from the longest items until it fits
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while (currentLength > availableLength) {
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const maxLength = Math.max(...lengths);
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const shorterItems = lengths.filter(l => l !== maxLength);
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const nextToMaxLength =
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shorterItems.length > 0 ? Math.max(...shorterItems) : 0;
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const maxReduce = maxLength - nextToMaxLength;
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let maxItems = lengths.length - shorterItems.length;
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let overrun = currentLength - availableLength;
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for (let i = 0; i < lengths.length; i++) {
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if (lengths[i] === maxLength) {
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const reduce = Math.min(Math.floor(overrun / maxItems), maxReduce);
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lengths[i] -= reduce;
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currentLength -= reduce;
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overrun -= reduce;
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maxItems--;
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}
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}
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}
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// Return args reduced to length in lengths
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return args.map((a, i) => {
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const str = `${a}`;
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const length = lengths[i];
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if (str.length === length) {
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return str;
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} else if (length > 5) {
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return "..." + str.slice(-length + 3);
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} else if (length > 0) {
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return str.slice(-length);
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} else {
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return "";
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}
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});
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};
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module.exports = truncateArgs;
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