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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 {
flattenGrouplike, updatePlaylistFormat, getItemPath
} = require('./playlist-utils')
const { getDownloaderFor, makePowerfulDownloader } = require('./downloaders')
const { promisify } = require('util')
const { spawn } = require('child_process')
const mkdirp = promisify(require('mkdirp'))
const readFile = promisify(fs.readFile)
const readdir = promisify(fs.readdir)
async function downloadCrawl(playlist, topOut = './out/') {
const flat = flattenGrouplike(playlist)
let doneCount = 0
const showStatus = function() {
const total = flat.items.length
const percent = Math.trunc(doneCount / total * 10000) / 100
console.log(
`\x1b[1mDownload crawler - ${percent}% completed ` +
`(${doneCount}/${total} tracks)\x1b[0m`)
}
// First off, we go through all tracks and see which are already downloaded.
// We store the ones that *aren't* downloaded in an 'itemsToDownload' array,
// which we use later.
const itemsToDownload = []
const targetFileSymbol = Symbol('Target file')
for (let item of flat.items) {
const parentGroups = getItemPath(item).slice(0, -1)
const dir = parentGroups.reduce((a, b) => {
return a + '/' + sanitize(b.name)
}, topOut) + '/'
const base = path.basename(item.name, path.extname(item.name))
const targetFile = dir + sanitize(base) + '.mp3'
// We'll be using the target file later when we download all tracks, so
// we save that right on the playlist item.
item[targetFileSymbol] = targetFile
await mkdirp(dir)
// 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(dir)
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`)
doneCount++
showStatus()
} else {
itemsToDownload.push(item)
}
}
// Now that we've decided on which items we need to download, we go through
// and download all of them.
for (let item of itemsToDownload) {
const targetFile = item[targetFileSymbol]
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 {
console.log(targetFile)
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
}
}
doneCount++
showStatus()
}
}
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])))
await downloadCrawl(playlist)
console.log(
'Done - downloaded to out/. (Use crawl-local out/ to create a playlist.)'
)
}
module.exports = main
if (require.main === module) {
main(process.argv.slice(2))
.catch(err => console.error(err))
}
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