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'use strict'
const fs = require('fs')
const tempy = require('tempy')
const { spawn } = require('child_process')
const { promisify } = require('util')
const fetch = require('node-fetch')
const path = require('path')
const promisifyProcess = require('./promisify-process')
const sanitize = require('sanitize-filename')
const writeFile = promisify(fs.writeFile)
module.exports = async function loopPlay(picker, downloader, playArgs = []) {
// Looping play function. Takes one argument, the "pick" function,
// which returns a track to play. Preemptively downloads the next
// track while the current one is playing for seamless continuation
// from one song to the next. Stops when the result of the pick
// function is null (or similar). Optionally takes a second argument
// used as arguments to the `play` process (before the file name).
async function downloadNext() {
const picked = picker()
if (picked == null) {
return false
}
const [ title, downloaderArg ] = picked
console.log(`Downloading ${title}..\nDownloader arg: ${downloaderArg}`)
const tempDir = tempy.directory()
const wavFile = tempDir + `/.${sanitize(title)}.wav`
const downloadFile = tempDir + '/.dl-' + path.basename(downloaderArg)
await downloader(downloaderArg, downloadFile)
try {
await convert(downloadFile, wavFile)
} catch(err) {
console.warn("Failed to convert " + title)
console.warn("Selecting a new track\n")
return await downloadNext()
}
return wavFile
}
let wavFile = await downloadNext()
while (wavFile) {
const nextPromise = downloadNext()
await playFile(wavFile, playArgs)
wavFile = await nextPromise
}
}
function convert(fromFile, toFile) {
const avconv = spawn('avconv', ['-y', '-i', fromFile, toFile])
return promisifyProcess(avconv, false)
}
function playFile(file, opts = []) {
const play = spawn('play', [...opts, file])
return promisifyProcess(play)
}
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