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