☰

Youtube Live Clock

show duration for livestreams and present time for archives

  1. // ==UserScript==
  2. // @name              Youtube Live Clock
  3. // @name:zh-TW        Youtube Live Clock
  4. // @namespace         https://greasyfork.org/scripts/453367
  5. // @version           1.8.1
  6. // @description       show duration for livestreams and present time for archives
  7. // @description:zh-TW 顯示直播及直播存檔當下的時間
  8. // @author            Derek
  9. // @match             *://www.youtube.com/*
  10. // @run-at            document-start
  11. // @grant             GM_addStyle
  12. // ==/UserScript==
  13.  
  14. (() => {
  15.   //you can choose your ideal date format by changing the FORMAT's value below
  16.   const FORMAT = 1
  17.   /*
  18.     1: 2022/10/31 06:37:10 (default)
  19.     2: 10/31/2022 06:37:10
  20.     3: 31/10/2022 06:37:10
  21.     4: Mon 31/10/2022 06:37:10
  22.     5: Monday 31/10/2022 06:37:10
  23.     6: Monday 31 October 2022 06:37:10
  24.   */
  25.  
  26.   GM_addStyle(`
  27.     .ytp-chrome-bottom .ytp-time-display,
  28.     .ytp-chrome-bottom .ytp-right-controls {
  29.       display: flex !important;
  30.     }
  31.     #present-time {
  32.       margin: 0 10px 0 5px !important;
  33.     }
  34.   `)
  35.  
  36.   const $ = (element) => document.querySelector(element)
  37.  
  38.   const abbr = {
  39.     week: { Sun: 'Sunday', Mon: 'Monday', Tue: 'Tuesday', Wed: 'Wednesday', Thu: 'Thursday', Fri: 'Friday', Sat: 'Saturday' },
  40.     monthFull: { Jan: 'January', Feb: 'February', Mar: 'March', Apr: 'April', May: 'May', Jun: 'June', Jul: 'July', Aug: 'August', Sep: 'September', Oct: 'October', Nov: 'November', Dec: 'December' },
  41.     month: { Jan: '01', Feb: '02', Mar: '03', Apr: '04', May: '05', Jun: '06', Jul: '07', Aug: '08', Sep: '09', Oct: '10', Nov: '11', Dec: '12' }
  42.   }
  43.  
  44.   const twoDigit = (num) => num.toString().padStart(2, '0')
  45.  
  46.   const timeFormat = (time) => {
  47.     const second = time % 60
  48.     const minute = Math.floor((time / 60) % 60)
  49.     const hour = Math.floor(time / 3600)
  50.     return hour > 0 ? `${hour}:${twoDigit(minute)}:${twoDigit(second)}` : `${minute}:${twoDigit(second)}`
  51.   }
  52.  
  53.   const dateFormat = (presentTime) => {
  54.     const [week, month, day, year, time] = presentTime.toString().split(' ')
  55.     return {
  56.       1: ` (${year}/${abbr.month[month]}/${day} ${time})`,
  57.       2: ` (${abbr.month[month]}/${day}/${year} ${time})`,
  58.       3: ` (${day}/${abbr.month[month]}/${year} ${time})`,
  59.       4: ` (${week} ${day}/${abbr.month[month]}/${year} ${time})`,
  60.       5: ` (${abbr.week[week]} ${day}/${abbr.month[month]}/${year} ${time})`,
  61.       6: ` (${abbr.week[week]} ${day} ${abbr.monthFull[month]} ${year} ${time})`
  62.     }[FORMAT]
  63.   }
  64.  
  65.   let videoId, timeDisplay, progressBar, liveData, publication, observer
  66.   let videoData = null
  67.  
  68.   const waitElements = () => {
  69.     return new Promise((resolve) => {
  70.       const observer = new MutationObserver(() => {
  71.         timeDisplay = $('.ytp-chrome-bottom .ytp-time-display')
  72.         progressBar = $('.ytp-chrome-bottom .ytp-progress-bar')
  73.  
  74.         if (timeDisplay && progressBar) {
  75.           if (videoData !== $('#microformat script')) {
  76.             videoData = $('#microformat script')
  77.             observer.disconnect()
  78.             resolve()
  79.           }
  80.         }
  81.       })
  82.       observer.observe(document.body, { attributes: false, childList: true, subtree: true })
  83.     })
  84.   }
  85.  
  86.   const getLiveClock = () => {
  87.     let clockElement = $('#present-time')
  88.     if (!clockElement) {
  89.       clockElement = document.createElement('span')
  90.       clockElement.id = 'present-time'
  91.       timeDisplay.insertBefore(clockElement, timeDisplay.childNodes[1])
  92.     }
  93.     return clockElement
  94.   }
  95.  
  96.   const updateLiveTime = () => {
  97.     const progressTime = progressBar.getAttribute('aria-valuenow')
  98.     return publication.endDate ? dateFormat(new Date(Date.parse(publication.startDate) + progressTime * 1000)) : timeFormat(progressTime)
  99.   }
  100.  
  101.   const main = async (vid) => {
  102.     if (videoId === vid) return
  103.     videoId = vid
  104.  
  105.     if (observer) observer.disconnect()
  106.     await waitElements()
  107.  
  108.     liveData = JSON.parse(videoData.textContent)
  109.     if (!liveData.publication) {
  110.       if ($('#present-time')) $('#present-time').remove()
  111.       return
  112.     }
  113.     publication = liveData.publication[0]
  114.  
  115.     let liveClock = getLiveClock()
  116.     liveClock.textContent = updateLiveTime()
  117.  
  118.     observer = new MutationObserver(() => { liveClock.textContent = updateLiveTime() })
  119.     observer.observe(progressBar, { characterData: true, attributeFilter: ['aria-valuenow'] })
  120.   }
  121.  
  122.   document.addEventListener('yt-navigate-finish', (event) => {
  123.     const url = event.detail.endpoint.commandMetadata.webCommandMetadata.url
  124.     if (url.startsWith('/watch?v=') || url.startsWith('/live/')) main(url.match(/[A-z0-9_-]{11}/)[0])
  125.   })
  126. })()