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#!/usr/bin/env node
'use strict'
const fs = require('fs')
const path = require('path')
const sanitize = require('sanitize-filename')
const promisifyProcess = require('./promisify-process')
const {
isGroup, isTrack, flattenGrouplike, updatePlaylistFormat
} = require('./playlist-utils')
const { getDownloaderFor, makePowerfulDownloader } = require('./downloaders')
const { promisify } = require('util')
const { spawn } = require('child_process')
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)
async function downloadCrawl(topPlaylist, initialOutPath = './out/') {
let doneCount = 0
let total = flattenGrouplike(topPlaylist).items.length
const status = function() {
const percent = Math.trunc(doneCount / total * 10000) / 100
console.log(
`\x1b[1mDownload crawler - ${percent}% completed ` +
`(${doneCount}/${total} tracks)\x1b[0m`)
}
const recursive = async function(groupContents, outPath) {
// 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)
}
let outPlaylist = []
for (let item of groupContents) {
if (isGroup(item)) {
// TODO: Not sure if this is the best way to pick the next out dir.
const out = outPath + sanitize(item.name) + '/'
outPlaylist.push({
name: item.name,
items: await recursive(item.items, out)
})
} else if (isTrack(item)) {
const base = path.basename(item.name, path.extname(item.name))
const targetFile = outPath + sanitize(base) + '.mp3'
// 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(item => {
const itemBase = sanitize(path.basename(item, path.extname(item)))
return itemBase === base
})
if (match) {
console.log(`\x1b[32;2mAlready downloaded: ${targetFile}\x1b[0m`)
outPlaylist.push({name: item.name, downloaderArg: outPath + match})
doneCount++
status()
continue
}
console.log(
`\x1b[2mDownloading: ${item.name} - ${item.downloaderArg}` +
` => ${targetFile}\x1b[0m`
)
// Woo-hoo, using block labels for their intended purpose! (Maybe?)
downloadProcess: {
const downloader = makePowerfulDownloader(
getDownloaderFor(item.downloaderArg)
)
const outputtedFile = await downloader(item.downloaderArg)
// If the return of the downloader is false, then the download
// failed.
if (outputtedFile === false) {
console.error(
`\x1b[33;1mDownload failed (item skipped): ${item.name}\x1b[0m`
)
break downloadProcess
}
try {
await promisifyProcess(spawn('ffmpeg', [
'-i', outputtedFile,
// A bug (in ffmpeg or macOS; not this) makes it necessary to have
// these options on macOS, otherwise the outputted file length is
// wrong.
'-write_xing', '0',
targetFile
]), false)
} catch(err) {
console.error(
`\x1b[33;1mFFmpeg failed (item skipped): ${item.name}\x1b[0m`
)
break downloadProcess
}
console.log('Added:', item.name)
outPlaylist.push({name: item.name, downloaderArg: targetFile})
}
doneCount++
status()
}
}
return outPlaylist
}
return {items: await recursive(topPlaylist.items, initialOutPath)}
}
async function main(args) {
// TODO: Implement command line stuff here
if (args.length === 0) {
console.error('Usage: download-playlist <playlistFile> [opts]')
return
}
const playlist = updatePlaylistFormat(JSON.parse(await readFile(args[0])))
const outPlaylist = await downloadCrawl(playlist)
await writeFile('out/playlist.json', JSON.stringify(outPlaylist, null, 2))
console.log('Done - saved playlist to out/playlist.json.')
process.exit(0)
}
module.exports = main
if (require.main === module) {
main(process.argv.slice(2))
.catch(err => console.error(err))
}
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