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const { spawn } = require('child_process')
const { promisify } = require('util')
const fetch = require('node-fetch')
const fs = require('fs')
const npmCommandExists = require('command-exists')
const readFile = promisify(fs.readFile)
module.exports.promisifyProcess = function(proc, showLogging = true) {
// Takes a process (from the child_process module) and returns a promise
// that resolves when the process exits (or rejects, if the exit code is
// non-zero).
return new Promise((resolve, reject) => {
if (showLogging) {
proc.stdout.pipe(process.stdout)
proc.stderr.pipe(process.stderr)
}
proc.on('exit', code => {
if (code === 0) {
resolve()
} else {
reject(code)
}
})
})
}
module.exports.commandExists = async function(command) {
// When the command-exists module sees that a given command doesn't exist, it
// throws an error instead of returning false, which is not what we want.
try {
return await npmCommandExists(command)
} catch(err) {
return false
}
}
module.exports.killProcess = async function(proc) {
// Windows is stupid and doesn't like it when we try to kill processes.
// So instead we use taskkill! https://stackoverflow.com/a/28163919/4633828
if (await module.exports.commandExists('taskkill')) {
await module.exports.promisifyProcess(
spawn('taskkill', ['/pid', proc.pid, '/f', '/t']),
false
)
} else {
proc.kill()
}
}
function downloadPlaylistFromURL(url) {
return fetch(url).then(res => res.text())
}
function downloadPlaylistFromLocalPath(path) {
return readFile(path).then(buf => buf.toString())
}
module.exports.downloadPlaylistFromOptionValue = function(arg) {
// TODO: Verify things!
if (arg.startsWith('http://') || arg.startsWith('https://')) {
return downloadPlaylistFromURL(arg)
} else {
return downloadPlaylistFromLocalPath(arg)
}
}
module.exports.shuffleArray = function(array) {
// Shuffles the items in an array. Returns a new array (does not modify the
// passed array). Super-interesting post on how this algorithm works:
// https://bost.ocks.org/mike/shuffle/
const workingArray = array.slice(0)
let m = array.length
while (m) {
let i = Math.floor(Math.random() * m)
m--
// Stupid lol; avoids the need of a temporary variable!
Object.assign(workingArray, {
[m]: workingArray[i],
[i]: workingArray[m]
})
}
return workingArray
}
module.exports.throttlePromise = function(maximumAtOneTime = 10) {
// Returns a function that takes a callback to create a promise and either
// runs it now, if there is an available slot, or enqueues it to be run
// later, if there is not.
let activeCount = 0
const queue = []
const execute = function(callback) {
activeCount++
return callback().finally(() => {
activeCount--
if (queue.length) {
return execute(queue.shift())
}
})
}
const enqueue = function(callback) {
if (activeCount >= maximumAtOneTime) {
return new Promise((resolve, reject) => {
queue.push(function() {
return callback().then(resolve, reject)
})
})
} else {
return execute(callback)
}
}
enqueue.queue = queue
return enqueue
}
module.exports.getTimeStringsFromSec = function(curSecTotal, lenSecTotal) {
const percentVal = (100 / lenSecTotal) * curSecTotal
const percentDone = (
(Math.trunc(percentVal * 100) / 100).toFixed(2) + '%'
)
const leftSecTotal = lenSecTotal - curSecTotal
let leftHour = Math.floor(leftSecTotal / 3600)
let leftMin = Math.floor((leftSecTotal - leftHour * 3600) / 60)
let leftSec = Math.floor(leftSecTotal - leftHour * 3600 - leftMin * 60)
// Yeah, yeah, duplicate math.
let curHour = Math.floor(curSecTotal / 3600)
let curMin = Math.floor((curSecTotal - curHour * 3600) / 60)
let curSec = Math.floor(curSecTotal - curHour * 3600 - curMin * 60)
// Wee!
let lenHour = Math.floor(lenSecTotal / 3600)
let lenMin = Math.floor((lenSecTotal - lenHour * 3600) / 60)
let lenSec = Math.floor(lenSecTotal - lenHour * 3600 - lenMin * 60)
const pad = val => val.toString().padStart(2, '0')
curMin = pad(curMin)
curSec = pad(curSec)
lenMin = pad(lenMin)
lenSec = pad(lenSec)
leftMin = pad(leftMin)
leftSec = pad(leftSec)
// We don't want to display hour counters if the total length is less
// than an hour.
let timeDone, timeLeft, duration
if (parseInt(lenHour) > 0) {
timeDone = `${curHour}:${curMin}:${curSec}`
timeLeft = `${leftHour}:${leftMin}:${leftSec}`
duration = `${lenHour}:${lenMin}:${lenSec}`
} else {
timeDone = `${curMin}:${curSec}`
timeLeft = `${leftMin}:${leftSec}`
duration = `${lenMin}:${lenSec}`
}
return {percentDone, timeDone, timeLeft, duration, curSecTotal, lenSecTotal}
}
module.exports.getTimeStrings = function({curHour, curMin, curSec, lenHour, lenMin, lenSec}) {
// Multiplication casts to numbers; addition prioritizes strings.
// Thanks, JavaScript!
const curSecTotal = (3600 * curHour) + (60 * curMin) + (1 * curSec)
const lenSecTotal = (3600 * lenHour) + (60 * lenMin) + (1 * lenSec)
return module.exports.getTimeStringsFromSec(curSecTotal, lenSecTotal)
}
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