'use strict'
// dependencies
const figures = require('figures')
const path = require('path')
const hrtime = require('pretty-hrtime')
const bytes = require('pretty-bytes')
// cache this value as a constant, we assume it never changes
const pwd = process.cwd()
/**
* Helper for outputting an absolute path relative to pwd.
*
* @param {String} to The absolute path to render.
* @return {String} relative
*/
exports.relative = function (to) {
if (pwd === to) return '.'
return path.relative(pwd, to)
}
/**
* Helper for determining the real size in bytes of an input buffer/string.
*
* @param {Buffer} input The input to measure.
* @param {Boolean} raw Turn on to get a raw number.
* @return {String} size
*/
exports.size = function (input, raw) {
let size = input ? Buffer.byteLength(input) : 0
return raw ? size : bytes(size)
}
exports.sizeDiff = function (a, b) {
let before = bytes(a)
let after = bytes(b)
let arrow = figures.arrowRight
let delta = Math.round(((b - a) / a) * 100)
let diff = delta > 0 ? `+${delta}%` : `${delta}%`
return `${before} ${arrow} ${after} (${diff})`
}
/**
* Helper for high-res timing. A function is returned that, when invoked,
* returns the elapsed time.
*
* @return {Function} timer
*/
exports.timer = function () {
let start = process.hrtime()
return raw => {
let elapsed = process.hrtime(start)
return raw ? elapsed : hrtime(elapsed)
}
}
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