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'use strict'
const fs = require('fs')
const { getCrawlerByName } = require('./crawlers')
const { isGroup, filterTracks, sourceSymbol } = require('./playlist-utils')
const { promisify } = require('util')
const readFile = promisify(fs.readFile)
async function processSmartPlaylist(item) {
// Object.assign is used so that we keep original properties, e.g. "name"
// or "apply". (It's also used so we return copies of original objects.)
const newItem = Object.assign({}, item)
if ('source' in newItem) {
const [ name, ...args ] = item.source
const crawlModule = getCrawlerByName(name)
if (crawlModule) {
const { crawl } = crawlModule
Object.assign(newItem, await crawl(...args))
} else {
console.error(`No crawler by name ${name} - skipped item:`, item)
newItem.failed = true
}
delete newItem.source
} else if ('items' in newItem) {
newItem.items = await Promise.all(item.items.map(processSmartPlaylist))
}
if ('filters' in newItem) filters: {
if (!isGroup(newItem)) {
console.warn('Filter on non-group (no effect):', newItem)
break filters
}
newItem.filters = newItem.filters.filter(filter => {
if ('tag' in filter === false) {
console.warn('Filter is missing "tag" property (skipping this filter):', filter)
return false
}
return true
})
Object.assign(newItem, filterTracks(newItem, track => {
for (const filter of newItem.filters) {
const { tag } = filter
let value = track
for (const key of tag.split('.')) {
if (key in Object(value)) {
value = value[key]
} else {
console.warn(`In tag "${tag}", key "${key}" not found.`)
console.warn('...value until now:', value)
console.warn('...track:', track)
console.warn('...filter:', filter)
return false
}
}
if ('gt' in filter && value <= filter.gt) return false
if ('lt' in filter && value >= filter.lt) return false
if ('gte' in filter && value < filter.gte) return false
if ('lte' in filter && value > filter.lte) return false
if ('least' in filter && value < filter.least) return false
if ('most' in filter && value > filter.most) return false
if ('min' in filter && value < filter.min) return false
if ('max' in filter && value > filter.max) return false
for (const prop of ['includes', 'contains']) {
if (prop in filter) {
if (Array.isArray(value) || typeof value === 'string') {
if (!value.includes(filter.includes)) return false
} else {
console.warn(
`Value of tag "${tag}" is not an array or string, so passing ` +
`"${prop}" does not make sense.`
)
console.warn('...value:', value)
console.warn('...track:', track)
console.warn('...filter:', filter)
return false
}
}
}
if (filter.regex) {
if (typeof value === 'string') {
let re
try {
re = new RegExp(filter.regex)
} catch (error) {
console.warn('Invalid regular expression:', re)
console.warn('...error message:', error.message)
console.warn('...filter:', filter)
return false
}
if (!re.test(value)) return false
} else {
console.warn(
`Value of tag "${tag}" is not a string, so passing "regex" ` +
'does not make sense.'
)
console.warn('...value:', value)
console.warn('...track:', track)
console.warn('...filter:', filter)
return false
}
}
}
return true
}))
delete newItem.filters
}
return newItem
}
async function main(opts) {
// TODO: Error when no file is given
if (opts.length === 0) {
console.log("Usage: smart-playlist /path/to/playlist")
} else {
const playlist = JSON.parse(await readFile(opts[0]))
console.log(JSON.stringify(await processSmartPlaylist(playlist), null, 2))
}
}
module.exports = Object.assign(main, {processSmartPlaylist})
if (require.main === module) {
main(process.argv.slice(2))
.catch(err => console.error(err))
}
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