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// TODO: This almost definitely doesn't work, ever since downloaders were
// removed! Maybe it's possible to make mpv only download (and not play) a
// file?
'use strict'
const fs = require('fs')
const downloaders = require('./downloaders')
const path = require('path')
const processArgv = require('./process-argv')
const sanitize = require('sanitize-filename')
const {
isGroup, isTrack
} = require('./playlist-utils')
const { promisify } = require('util')
const access = promisify(fs.access)
const mkdir = promisify(fs.mkdir)
const readFile = promisify(fs.readFile)
const readdir = promisify(fs.readdir)
const stat = promisify(fs.stat)
const writeFile = promisify(fs.writeFile)
const ncp = promisify(require('ncp').ncp)
// It's typically bad to attempt to download or copy a million files at once,
// so we create a "promise delayer" that forces only several promises to run at
// at one time.
let delayPromise
{
const INTERVAL = 50
const MAX = 5
let active = 0
let queue = []
delayPromise = function(promiseMaker) {
return new Promise((resolve, reject) => {
queue.push([promiseMaker, resolve, reject])
})
}
setInterval(async () => {
if (active >= MAX) {
return
}
const top = queue.pop()
if (top) {
const [ promiseMaker, resolve, reject ] = top
active++
console.log('Going - queue: ' + queue.length)
try {
resolve(await promiseMaker())
} catch(err) {
reject(err)
}
active--
}
}, INTERVAL)
}
async function downloadCrawl(playlist, downloader, outPath = './out/') {
// If the output folder doesn't exist, we should create it.
let doesExist = true
try {
doesExist = (await stat(outPath)).isDirectory()
} catch(err) {
doesExist = false
}
if (!doesExist) {
await mkdir(outPath)
}
return Promise.all(playlist.map(async (item) => {
if (isGroup(item)) {
// TODO: Not sure if this is the best way to pick the next out dir.
const out = outPath + sanitize(item[0]) + '/'
return [item[0], await downloadCrawl(item[1], downloader, out)]
} else if (isTrack(item)) {
// TODO: How should we deal with songs that don't have an extension?
const ext = path.extname(item[1])
const base = path.basename(item[1], ext)
const out = outPath + base + ext
// If we've already downloaded a file at some point in previous time,
// there's no need to download it again!
//
// Since we can't guarantee the extension name of the file, we only
// compare bases.
//
// TODO: This probably doesn't work well with things like the YouTube
// downloader.
const items = await readdir(outPath)
const match = items.find(x => path.basename(x, path.extname(x)) === base)
if (match) {
console.log(`\x1b[32;2mAlready downloaded: ${out}\x1b[0m`)
return [item[0], outPath + match]
}
console.log(`\x1b[2mDownloading: ${item[0]} - ${item[1]}\x1b[0m`)
const downloadFile = await delayPromise(() => downloader(item[1]))
// console.log(downloadFile, path.resolve(out))
try {
await delayPromise(() => ncp(downloadFile, path.resolve(out)))
console.log(`\x1b[32;1mDownloaded: ${out}\x1b[0m`)
return [item[0], out]
} catch(err) {
console.error(`\x1b[31mFailed: ${out}\x1b[0m`)
console.error(err)
return false
}
}
})).then(p => p.filter(Boolean))
}
async function main() {
// TODO: Implement command line stuff here
if (process.argv.length === 2) {
console.error('Usage: download-playlist <playlistFile> [opts]')
return
}
const playlist = JSON.parse(await readFile(process.argv[2]))
let downloaderType = 'http'
processArgv(process.argv.slice(3), {
'-downloader': util => {
downloaderType = util.nextArg()
}
})
const dl = downloaders.makePowerfulDownloader(
downloaders.getDownloader(downloaderType)
)
const outPlaylist = await downloadCrawl(playlist, dl)
await writeFile('out/playlist.json', JSON.stringify(outPlaylist, null, 2))
console.log('Done - saved playlist to out/playlist.json.')
process.exit(0)
}
main()
.catch(err => console.error(err))
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