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pad-levels.js
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pad-levels.js
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/* eslint no-unused-vars: 0 */
'use strict';
const { configs, LEVEL, MESSAGE } = require('triple-beam');
class Padder {
constructor(opts = { levels: configs.npm.levels }) {
this.paddings = Padder.paddingForLevels(opts.levels, opts.filler);
this.options = opts;
}
/**
* Returns the maximum length of keys in the specified `levels` Object.
* @param {Object} levels Set of all levels to calculate longest level against.
* @returns {Number} Maximum length of the longest level string.
*/
static getLongestLevel(levels) {
const lvls = Object.keys(levels).map(level => level.length);
return Math.max(...lvls);
}
/**
* Returns the padding for the specified `level` assuming that the
* maximum length of all levels it's associated with is `maxLength`.
* @param {String} level Level to calculate padding for.
* @param {String} filler Repeatable text to use for padding.
* @param {Number} maxLength Length of the longest level
* @returns {String} Padding string for the `level`
*/
static paddingForLevel(level, filler, maxLength) {
const targetLen = maxLength + 1 - level.length;
const rep = Math.floor(targetLen / filler.length);
const padding = `${filler}${filler.repeat(rep)}`;
return padding.slice(0, targetLen);
}
/**
* Returns an object with the string paddings for the given `levels`
* using the specified `filler`.
* @param {Object} levels Set of all levels to calculate padding for.
* @param {String} filler Repeatable text to use for padding.
* @returns {Object} Mapping of level to desired padding.
*/
static paddingForLevels(levels, filler = ' ') {
const maxLength = Padder.getLongestLevel(levels);
return Object.keys(levels).reduce((acc, level) => {
acc[level] = Padder.paddingForLevel(level, filler, maxLength);
return acc;
}, {});
}
/**
* Prepends the padding onto the `message` based on the `LEVEL` of
* the `info`. This is based on the behavior of `winston@2` which also
* prepended the level onto the message.
*
* See: https://github.com/winstonjs/winston/blob/2.x/lib/winston/logger.js#L198-L201
*
* @param {Info} info Logform info object
* @param {Object} opts Options passed along to this instance.
* @returns {Info} Modified logform info object.
*/
transform(info, opts) {
info.message = `${this.paddings[info[LEVEL]]}${info.message}`;
if (info[MESSAGE]) {
info[MESSAGE] = `${this.paddings[info[LEVEL]]}${info[MESSAGE]}`;
}
return info;
}
}
/*
* function padLevels (info)
* Returns a new instance of the padLevels Format which pads
* levels to be the same length. This was previously exposed as
* { padLevels: true } to transports in `winston < 3.0.0`.
*/
module.exports = opts => new Padder(opts);
module.exports.Padder
= module.exports.Format
= Padder;