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'use strict'
const fs = require('fs')
const util = require('util')
const processArgv = require('./process-argv')
const { updatePlaylistFormat, isGroup, isItem, getItemPathString } = require('./playlist-utils')
const readFile = util.promisify(fs.readFile)
const cachedDuration = Symbol('Cached duration')
function getUncachedDurationOfItem(item) {
if (isGroup(item)) {
return item.items.reduce((a, b) => a + getDurationOfItem(b), 0)
} else {
if (item && item.metadata && item.metadata.duration) {
return item.metadata.duration
} else {
console.warn('Item missing metadata:', getItemPathString(item))
return 0
}
}
}
// This is mostly just to avoid logging out "item missing metadata" warnings
// multiple times.
function getDurationOfItem(item) {
if (cachedDuration in item === false) {
item[cachedDuration] = getUncachedDurationOfItem(item)
}
return item[cachedDuration]
}
const getHours = n => Math.floor(n / 3600)
const getMinutes = n => Math.floor((n % 3600) / 60)
const getSeconds = n => n % 60
function wordFormatDuration(durationNumber) {
if (typeof durationNumber !== 'number') {
throw new Error('Non-number passed')
}
// oh yeah
const hours = getHours(durationNumber),
minutes = getMinutes(durationNumber),
seconds = getSeconds(durationNumber)
return [
hours ? `${hours} hours` : false,
minutes ? `${minutes} minutes` : false,
seconds ? `${seconds} seconds` : false
].filter(Boolean).join(', ') || '(No length.)'
}
function digitalFormatDuration(durationNumber) {
if (typeof durationNumber !== 'number') {
throw new Error('Non-number passed')
}
const hours = getHours(durationNumber),
minutes = getMinutes(durationNumber),
seconds = getSeconds(durationNumber)
return [hours, minutes, seconds].filter(Boolean).length ? [
hours ? `${hours}` : false,
minutes ? `${minutes}`.padStart(2, '0') : '00',
seconds ? `${seconds}`.padStart(2, '0') : '00'
].filter(Boolean).join(':') : '(No length.)'
}
function padStartList(strings) {
const len = strings.reduce((a, b) => Math.max(a, b.length), 0)
return strings.map(s => s.padStart(len, ' '))
}
function makePlaylistGraph(playlist, {
graphWidth = 60,
onlyFirst = 20
} = {}) {
const output = []
const wholePlaylistLength = getDurationOfItem(playlist)
let topThings = playlist.items.map((item, i) => ({
item,
duration: getDurationOfItem(item),
digitalDuration: digitalFormatDuration(getDurationOfItem(item))
}))
topThings.sort((a, b) => b.duration - a.duration)
const ignoredThings = topThings.slice(onlyFirst)
topThings = topThings.slice(0, onlyFirst)
const displayLength = topThings.reduce((a, b) => a + b.duration, 0)
// Left-pad the digital durations so they're all the same length.
{
const len = topThings.reduce((a, b) => Math.max(a, b.digitalDuration.length), 0)
for (const obj of topThings) {
obj.digitalDuration = obj.digitalDuration.padStart(len, ' ')
}
}
let totalWidth = 0
for (let i = 0; i < topThings.length; i++) {
// Add a color to each item.
const colorCode = (i % 6) + 1
topThings[i].fgColor = `\x1b[3${colorCode}m`
topThings[i].bgColor = `\x1b[4${colorCode}m`
topThings[i].partOfWhole = 1 / displayLength * topThings[i].duration
let w = Math.floor(topThings[i].partOfWhole * graphWidth)
if (totalWidth < graphWidth) {
w = Math.max(1, w)
}
totalWidth += w
topThings[i].visualWidth = w
}
output.push(' Whole length: ' + wordFormatDuration(wholePlaylistLength), '')
output.push(' ' + topThings.map(({ bgColor, fgColor, visualWidth }) => {
return bgColor + fgColor + '-'.repeat(visualWidth)
}).join('') + '\x1b[0m' + (ignoredThings.length ? ' *' : ''), '')
output.push(' Length by item:')
output.push(...topThings.map(({ item, digitalDuration, visualWidth, fgColor }) =>
` ${fgColor}${
// Dim the row if it doesn't show up in the graph.
visualWidth === 0 ? '\x1b[2m- ' : ' '
}${digitalDuration} ${item.name}\x1b[0m`
))
if (ignoredThings.length) {
const dur = wordFormatDuration(ignoredThings.reduce((a, b) => a + b.duration, 0))
output.push(
` \x1b[2m(* Plus ${ignoredThings.length} skipped items, accounting `,
` for ${dur}.)\x1b[0m`
)
}
if (topThings.some(x => x.visualWidth === 0)) {
output.push('',
' (Items that are too short to show up on the',
' visual graph are dimmed and marked with a -.)'
)
}
return output
}
async function main(args) {
if (args.length === 0) {
console.log("Usage: http-music duration-graph /path/to/processed-playlist.json")
return
}
let graphWidth = 60
let onlyFirst = 20
await processArgv(args.slice(1), {
'-graph-width': util => {
const arg = util.nextArg()
const newVal = parseInt(arg)
if (newVal > 0) {
graphWidth = newVal
} else {
console.warn('Didn\'t set graph width because it\'s not greater than 0:', arg)
}
},
'-width': util => util.alias('-graph-width'),
'w': util => util.alias('-graph-width'),
'-only-first': util => {
const arg = util.nextArg()
const newVal = parseInt(arg)
if (newVal > 0) {
onlyFirst = newVal
} else {
console.warn('You can\'t use the first *zero* tracks! -', arg)
}
},
'-only': util => util.alias('-only-first'),
'o': util => util.alias('-only-first'),
'-all': util => {
onlyFirst = Infinity
},
'a': util => util.alias('-all')
})
const playlist = updatePlaylistFormat(JSON.parse(await readFile(args[0])))
for (const line of makePlaylistGraph(playlist, {
graphWidth, onlyFirst
})) {
console.log(line)
}
}
module.exports = main
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