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Your IP : 52.14.75.147
const EE = require('events')
const onProgress = Symbol('onProgress')
const bars = Symbol('bars')
const listener = Symbol('listener')
const normData = Symbol('normData')
class Client extends EE {
constructor ({ normalize = false, stopOnDone = false } = {}) {
super()
this.normalize = !!normalize
this.stopOnDone = !!stopOnDone
this[bars] = new Map()
this[listener] = null
}
get size () {
return this[bars].size
}
get listening () {
return !!this[listener]
}
addListener (...args) {
return this.on(...args)
}
on (ev, ...args) {
if (ev === 'progress' && !this[listener]) {
this.start()
}
return super.on(ev, ...args)
}
off (ev, ...args) {
return this.removeListener(ev, ...args)
}
removeListener (ev, ...args) {
const ret = super.removeListener(ev, ...args)
if (ev === 'progress' && this.listeners(ev).length === 0) {
this.stop()
}
return ret
}
stop () {
if (this[listener]) {
process.removeListener('progress', this[listener])
this[listener] = null
}
}
start () {
if (!this[listener]) {
this[listener] = (...args) => this[onProgress](...args)
process.on('progress', this[listener])
}
}
[onProgress] (key, data) {
data = this[normData](key, data)
if (!this[bars].has(key)) {
this.emit('bar', key, data)
}
this[bars].set(key, data)
this.emit('progress', key, data)
if (data.done) {
this[bars].delete(key)
this.emit('barDone', key, data)
if (this.size === 0) {
if (this.stopOnDone) {
this.stop()
}
this.emit('done')
}
}
}
[normData] (key, data) {
const actualValue = data.value
const actualTotal = data.total
let value = actualValue
let total = actualTotal
const done = data.done || value >= total
if (this.normalize) {
const bar = this[bars].get(key)
total = 100
if (done) {
value = 100
} else {
// show value as a portion of 100
const pct = 100 * actualValue / actualTotal
if (bar) {
// don't ever go backwards, and don't stand still
// move at least 1% of the remaining value if it wouldn't move.
value = (pct > bar.value) ? pct
: (100 - bar.value) / 100 + bar.value
}
}
}
// include the key
return {
...data,
key,
name: data.name || key,
value,
total,
actualValue,
actualTotal,
done,
}
}
}
module.exports = Client